#!/usr/bin/env node

/**
 * Build and test Bun on macOS, Linux, and Windows.
 * @link https://buildkite.com/docs/pipelines/defining-steps
 */

import { join } from "node:path";
import {
  getBootstrapVersion,
  getBuildkiteEmoji,
  getBuildMetadata,
  getBuildNumber,
  getCanaryRevision,
  getCommitMessage,
  getEmoji,
  getEnv,
  getLastSuccessfulBuild,
  getSecret,
  isBuildkite,
  isBuildManual,
  isFork,
  isMainBranch,
  isMergeQueue,
  parseBoolean,
  setBuildMetadata,
  spawnSafe,
  startGroup,
  toYaml,
  uploadArtifact,
  writeFile,
} from "../scripts/utils.mjs";

/**
 * @typedef {"linux" | "darwin" | "windows" | "freebsd"} Os
 * @typedef {"aarch64" | "x64"} Arch
 * @typedef {"musl" | "android"} Abi
 * @typedef {"debian" | "ubuntu" | "alpine" | "amazonlinux"} Distro
 * @typedef {"latest" | "previous" | "oldest" | "eol"} Tier
 * @typedef {"release" | "assert" | "debug" | "asan"} Profile
 */

/**
 * @typedef Target
 * @property {Os} os
 * @property {Arch} arch
 * @property {Abi} [abi]
 * @property {boolean} [baseline]
 * @property {Profile} [profile]
 * @property {boolean} [crossCompile]
 *   Build on a Linux host for a foreign target OS (currently: darwin and
 *   windows). Agents/images resolve to the Linux build fleet; keys/labels/
 *   artifacts are unaffected — these ARE the darwin/windows build lanes,
 *   there is no native macOS or Windows build. FreeBSD/Android don't set
 *   this — they already imply a Linux host.
 */

/**
 * @param {Target} target
 * @returns {string}
 */
function getTargetKey(target) {
  const { os, arch, abi, baseline, profile } = target;
  let key = `${os}-${arch}`;
  if (abi) {
    key += `-${abi}`;
  }
  if (baseline) {
    key += "-baseline";
  }
  if (profile && profile !== "release") {
    key += `-${profile}`;
  }
  return key;
}

/**
 * @param {Target} target
 * @returns {string}
 */
function getTargetLabel(target) {
  const { os, arch, abi, baseline, profile } = target;
  let label = `${getBuildkiteEmoji(os)} ${arch}`;
  if (abi) {
    label += `-${abi}`;
  }
  if (baseline) {
    label += "-baseline";
  }
  if (profile && profile !== "release") {
    label += `-${profile}`;
  }
  return label;
}

/**
 * @typedef Platform
 * @property {Os} os
 * @property {Arch} arch
 * @property {Abi} [abi]
 * @property {boolean} [baseline]
 * @property {Profile} [profile]
 * @property {boolean} [crossCompile]
 * @property {Distro} [distro]
 * @property {string} release
 * @property {Tier} [tier]
 * @property {string[]} [features]
 */

// Azure VM sizes for Windows CI runners.
// DDSv6 = x64, DPSv6 = ARM64 (Cobalt 100). Quota: 100 cores per family in eastus2.
const azureVmSizes = {
  // Windows builds are cross-compiled on the Linux fleet; these sizes are for
  // the steps that still need a real Windows machine (test shards, signing,
  // and the baseline-verification emulator phase).
  "windows-x64": {
    build: "Standard_D16ds_v6", // 16 vCPU, 64 GiB — verify-baseline under Intel SDE
    test: "Standard_D4ds_v6", // 4 vCPU, 16 GiB — test shards, signing
  },
  "windows-aarch64": {
    test: "Standard_D4pds_v6", // 4 vCPU, 16 GiB, local NVMe — test shards
  },
};

function getAzureVmSize(os, arch, tier = "build") {
  return azureVmSizes[`${os}-${arch}`]?.[tier];
}

/**
 * The single host image every build lane runs on. All targets below —
 * linux x64/aarch64 × gnu/musl, darwin, windows, freebsd, android — are
 * cross-compiled from this debian-13 aarch64 box via --target/--sysroot
 * (scripts/build/config.ts + flags.ts) so one AMI serves every build.
 * @type {Platform}
 */
const buildHostPlatform = { os: "linux", arch: "aarch64", distro: "debian", release: "13" };

/**
 * @type {Platform[]}
 */
const buildPlatforms = [
  // macOS is cross-compiled from the debian-13 aarch64 host (clang --target +
  // the Apple SDK fetched by xmac + ld64.lld — see scripts/build/macos-sdk.ts
  // and scripts/build/flags.ts). There is no native macOS build lane: the mac
  // fleet only runs tests, against these artifacts (see testPlatforms), and
  // these are the darwin artifacts the release ships.
  { os: "darwin", arch: "aarch64", crossCompile: true, distro: "debian", release: "13" },
  { os: "darwin", arch: "x64", crossCompile: true, distro: "debian", release: "13" },
  { os: "linux", arch: "aarch64", distro: "debian", release: "13" },
  { os: "linux", arch: "x64", distro: "debian", release: "13" },
  // asan x64 cross-builds from the arm64 host too; if install_cross_compiler_rt()
  // can't fetch amd64 libclang-rt on arm64, this lane may need an x64 host as
  // the one exception — see scripts/bootstrap.sh.
  { os: "linux", arch: "x64", profile: "asan", distro: "debian", release: "13" },
  { os: "linux", arch: "aarch64", abi: "musl", distro: "debian", release: "13" },
  { os: "linux", arch: "x64", abi: "musl", distro: "debian", release: "13" },
  // Android: cross-compiled from the debian-13 aarch64 host via NDK sysroot.
  { os: "linux", arch: "aarch64", abi: "android", distro: "debian", release: "13" },
  { os: "linux", arch: "x64", abi: "android", distro: "debian", release: "13" },
  // FreeBSD: cross-compiled from the debian-13 aarch64 host via base.txz
  // sysroot, same model as Android. Target os/arch are explicit.
  { os: "freebsd", arch: "x64", distro: "debian", release: "13" },
  { os: "freebsd", arch: "aarch64", distro: "debian", release: "13" },
  // Windows is cross-compiled from the debian-13 aarch64 host (clang-cl
  // --target + the xwin MSVC/SDK sysroot + lld-link — see
  // scripts/build/winsysroot.ts and scripts/build/flags.ts), the same model
  // as macOS above. There is no native Windows build lane: the Windows fleet
  // only runs tests, signing, and baseline verification, against these
  // artifacts (see testPlatforms), and these are the Windows artifacts the
  // release ships. x64 uses ThinLTO + cross-language LTO by default; arm64
  // stays non-LTO (no windows-arm64-lto WebKit prebuilt, see config.ts).
  { os: "windows", arch: "x64", crossCompile: true, distro: "debian", release: "13" },
  { os: "windows", arch: "aarch64", crossCompile: true, distro: "debian", release: "13" },
];

/**
 * @type {Platform[]}
 */
const testPlatforms = [
  // Darwin arm64 is targeted by `release-tier` (see getTestAgent): one job on
  // `latest` (current macOS, 26 today) and one on `previous` (anything older
  // — currently 13/14/15). x64 is NOT tier-targeted: a single entry runs on
  // whichever Intel box is free. Intel Macs can't run latest macOS and the
  // tier split bottlenecked the smaller pool, so x64 trades guaranteed
  // version coverage for throughput. The `release` field only labels the step.
  // The darwin test suite runs on real macOS agents against the Linux-built
  // artifacts from the `darwin-<arch>-build-bun` steps (the only darwin build
  // lanes — see buildPlatforms).
  // These three version-specific lanes run on main and on opt-in (see
  // darwinTestsEnabled). PR builds instead get one aarch64 lane that any mac
  // agent can take (prDarwinTestPlatforms), so the whole arm64 pool serves PRs.
  { os: "darwin", arch: "aarch64", release: "26", tier: "latest" },
  { os: "darwin", arch: "aarch64", release: "14", tier: "previous" },
  { os: "darwin", arch: "x64", release: "14", tier: "latest" },
  { os: "linux", arch: "aarch64", distro: "debian", release: "13", tier: "latest" },
  { os: "linux", arch: "x64", distro: "debian", release: "13", tier: "latest" },
  { os: "linux", arch: "x64", profile: "asan", distro: "debian", release: "13", tier: "latest" },
  { os: "linux", arch: "aarch64", distro: "ubuntu", release: "25.04", tier: "latest" },
  { os: "linux", arch: "x64", distro: "ubuntu", release: "25.04", tier: "latest" },
  { os: "linux", arch: "aarch64", abi: "musl", distro: "alpine", release: "3.23", tier: "latest" },
  { os: "linux", arch: "x64", abi: "musl", distro: "alpine", release: "3.23", tier: "latest" },
  { os: "windows", arch: "x64", release: "2019", tier: "oldest" },
  { os: "windows", arch: "aarch64", release: "11", tier: "latest" },
];

/**
 * @param {Platform} platform
 * @returns {string}
 */
function getPlatformKey(platform) {
  const { distro, release } = platform;
  const target = getTargetKey(platform);
  const version = release.replace(/\./g, "");
  if (distro) {
    return `${target}-${distro}-${version}`;
  }
  return `${target}-${version}`;
}

/**
 * @param {Platform} platform
 * @returns {string}
 */
function getPlatformLabel(platform) {
  const { os, arch, baseline, profile, distro, release } = platform;
  let label = `${getBuildkiteEmoji(distro || os)} ${release} ${arch}`;
  if (baseline) {
    label += "-baseline";
  }
  if (profile && profile !== "release") {
    label += `-${profile}`;
  }
  return label;
}

/**
 * @param {Platform} platform
 * @returns {string}
 */
function getImageKey(platform) {
  const { os, arch, distro, release, features, abi, crossCompile } = platform;
  // Cross-compiled targets (Android, FreeBSD, macOS-cross) build from a Linux
  // host image — bootstrap.sh installs the NDK / base.txz sysroot on it (the
  // macOS SDK is fetched by the build itself). No separate image is baked.
  const hostOs = os === "freebsd" || crossCompile ? "linux" : os;
  const version = release.replace(/\./g, "");
  let key = `${hostOs}-${arch}-${version}`;
  if (distro) {
    key += `-${distro}`;
  }
  if (features?.length) {
    key += `-with-${features.join("-")}`;
  }

  if (abi && abi !== "android") {
    key += `-${abi}`;
  }

  return key;
}

/**
 * @param {Platform} platform
 * @returns {string}
 */
function getImageLabel(platform) {
  const { os, arch, distro, release } = platform;
  return `${getBuildkiteEmoji(distro || os)} ${release} ${arch}`;
}

/**
 * @param {Platform} platform
 * @param {PipelineOptions} options
 * @returns {string}
 */
function getImageName(platform, options) {
  const { os, distro, crossCompile } = platform;
  const { buildImages, publishImages, imageFilter } = options;

  const name = getImageKey(platform);

  // Cross-compiled targets (and FreeBSD) build on a Linux host image (see
  // getImageKey) — both the [build images] filter below and the published
  // image tag should be judged by the host, not the target. Windows-cross
  // would otherwise miss the freshly-baked linux image on a
  // "[build linux images]" run, and pick up bootstrap.ps1's version for a
  // linux image tag that doesn't exist.
  const hostOs = os === "freebsd" || crossCompile ? "linux" : os;

  if (buildImages && !publishImages && (!imageFilter || hostOs === imageFilter || distro === imageFilter)) {
    return `${name}-build-${getBuildNumber()}`;
  }

  return `${name}-v${getBootstrapVersion(hostOs)}`;
}

/**
 * @link https://buildkite.com/docs/pipelines/configure/retry#retry-attributes-automatic-retry-attributes
 */
function getRetry() {
  return {
    manual: {
      permit_on_passed: true,
    },
    // Self-heal agent/infra loss, and only that. Conditions within one rule
    // are ANDed, so `signal_reason` scopes each rule to the failure mode it
    // names: `none` is an agent that dropped its connection mid-job,
    // `agent_stop` is a graceful agent restart mid-job, `process_run_error`
    // is the bootstrap failing before the command ever ran. A blanket
    // `exit_status: -1` / `255` also matches `cancel`, which is what a
    // `timeout_in_minutes` kill records, so a timed-out shard would be
    // re-queued just to time out again on the next agent. User-canceled
    // builds are state=canceled and never auto-retry regardless of these
    // rules.
    automatic: [
      { exit_status: -1, signal_reason: "none", limit: 1 },
      { signal_reason: "agent_stop", limit: 2 },
      { signal_reason: "process_run_error", limit: 1 },
    ],
  };
}

/**
 * @returns {number}
 * @link https://buildkite.com/docs/pipelines/managing-priorities
 */
function getPriority() {
  if (isFork()) {
    return -1;
  }
  if (isMainBranch()) {
    return 2;
  }
  if (isMergeQueue()) {
    return 1;
  }
  return 0;
}

/**
 * Agents
 */

/**
 * @typedef {Object} Ec2Options
 * @property {string} instanceType
 * @property {boolean} dryRun
 */

/**
 * @param {Platform} platform
 * @param {PipelineOptions} options
 * @param {Ec2Options} ec2Options
 * @returns {Agent}
 */
function getEc2Agent(platform, options, ec2Options) {
  const { os, arch, abi, distro, release, crossCompile } = platform;
  const { instanceType } = ec2Options;
  // Cross-compiled targets run on a Linux EC2 box; the agent tag must match
  // the host (`linux`), not the target.
  const hostOs = os === "freebsd" || crossCompile ? "linux" : os;
  return {
    os: hostOs,
    arch,
    abi,
    distro,
    release,
    robobun: true,
    robobun2: true,
    "image-name": getImageName(platform, options),
    "instance-type": instanceType,
    "preemptible": false,
  };
}

/**
 * @param {Platform} platform
 * @param {PipelineOptions} options
 * @returns {string}
 */
function getBuildAgent(platform, options) {
  // Every build lane runs on the single debian-13 aarch64 host image
  // (buildHostPlatform) and cross-compiles to its target; the target's
  // os/arch only affect build args, not agent tags or image-name.
  const { os, arch, abi, profile } = platform;
  // Lanes without LTO (see ltoDefault in scripts/build/config.ts): rustc does its own fat LTO + codegen inside cargo, so the C++ compile overlapping it costs ~20s on 16 vCPUs; give them 32.
  const nonLto =
    profile === "asan" || abi === "android" || os === "freebsd" || (os === "windows" && arch === "aarch64");
  return getEc2Agent(buildHostPlatform, options, {
    // Replaces the c8g.4xlarge (C++) + r8g.2xlarge (cargo + ThinLTO link; r8g.4xlarge for asan) pair.
    instanceType: nonLto ? "r8g.8xlarge" : "r8g.4xlarge",
  });
}

/**
 * @param {Platform} platform
 * @param {PipelineOptions} options
 * @returns {Agent}
 */
function getTestAgent(platform, options) {
  const { os, arch, profile, tier } = platform;

  if (os === "darwin") {
    // `release-tier` is emitted by scripts/agent.mjs based on the box's macOS
    // major version. arm64 splits into `latest` (current macOS) + `previous`
    // (anything older). x64 is NOT tier-targeted — single entry, any Intel
    // box — because the tier split bottlenecked the smaller pool and Intel
    // can't run latest anyway.
    return {
      queue: `test-${os}`,
      os,
      arch,
      ...(arch === "aarch64" && tier ? { "release-tier": tier } : {}),
    };
  }

  // TODO: delete this block when we upgrade to mimalloc v3
  if (os === "windows") {
    return getEc2Agent(platform, options, {
      instanceType: getAzureVmSize(os, arch, "test"),
    });
  }

  // musl: same vCPU as glibc but 2× RAM (m-family). The alpine images now bake
  // ~14 GB of build prefetch + ~6 GB of pre-pulled docker test images, and
  // the docker test containers (mysql/postgres on tmpfs) run alongside the
  // tests — c-family's 8 GB was the wrong side of tight.
  const musl = platform.abi === "musl";

  if (arch === "aarch64") {
    if (profile === "asan") {
      // ASAN needs ~1:8 shadow memory plus a 256 MB quarantine per process
      // plus LSan loading the binary's DWARF; the c-family's 16 GB OOMs the
      // agent. r-family has 4× the RAM at the same vCPU.
      return getEc2Agent(platform, options, {
        instanceType: "r8g.2xlarge",
      });
    }
    return getEc2Agent(platform, options, {
      instanceType: musl ? "m8g.xlarge" : "c8g.xlarge",
    });
  }

  if (profile === "asan") {
    // Same rationale as the aarch64 asan branch above.
    return getEc2Agent(platform, options, {
      instanceType: "r7i.2xlarge",
    });
  }
  return getEc2Agent(platform, options, {
    instanceType: musl ? "m7i.xlarge" : "c7i.xlarge",
  });
}

/**
 * Steps
 */

/**
 * Build the scripts/build.ts argument list from a target's properties.
 * Replaces the old getBuildEnv (cmake -D env vars) + getBuildCommand
 * (--target passthrough) with direct build.ts flags.
 *
 * @param {Target} target
 * @param {PipelineOptions} options
 * @param {"build" | "cpp-only" | "rust-only" | "link-only" | "rust-and-link"} mode
 * @returns {string}
 */
function getBuildArgs(target, options, mode) {
  const { os, arch, abi, baseline, profile } = target;
  const { canary } = options;

  const args = [`--profile=ci-${mode}`];

  // All build lanes share a debian-13 arm64 host, so host detection cannot
  // infer the target triple — always pass os/arch (and abi on linux).
  args.push(`--os=${os}`, `--arch=${arch}`);
  if (os === "linux") args.push(`--abi=${abi ?? "gnu"}`);

  if (baseline) args.push("--baseline=on");
  if (profile === "asan") args.push("--asan=on");

  // canary: options.canary can be number (revision count) or undefined
  // (default on). Old system used CANARY_REVISION as a counter; build.ts
  // has only on/off — disabled only when explicitly 0.
  const canaryRev = typeof canary === "number" ? canary : 1;
  if (canaryRev === 0) args.push("--canary=off");

  return args.join(" ");
}

/**
 * @param {Target} target
 * @param {PipelineOptions} options
 * @param {"build" | "cpp-only" | "rust-only" | "link-only" | "rust-and-link"} mode
 * @returns {string}
 */
function getBuildCommand(target, options, mode) {
  // Windows code signing is handled by a dedicated 'windows-sign' step after
  // all Windows builds complete — see getWindowsSignStep(). smctl is x64-only,
  // so signing on the build agent wouldn't work for ARM64 anyway.
  //
  // Literal `node` — ci.mjs generates pipeline YAML that runs on a
  // different agent later, so process.execPath (the generator's path)
  // is wrong. PATH on the agent has node via bootstrap.sh.
  // --experimental-strip-types for Node 24's .ts support (unflagged in
  // 25+; drop once CI bumps past the ABI-141 blocker).
  return `node --experimental-strip-types scripts/build.ts ${getBuildArgs(target, options, mode)}`;
}

/**
 * deps + C++ + cargo + link on one agent; also uploads libbun-*.a, libbun_rust.a and the dep libs.
 *
 * @param {Platform} platform
 * @param {PipelineOptions} options
 * @returns {Step}
 */
function getBuildBunStep(platform, options) {
  const { os, arch } = platform;
  // BoringSSL's win-x64 assembly is NASM syntax. The agent images bake nasm
  // (.buildkite/Dockerfile); best-effort install covers older images, and
  // `|| true` keeps a missing package manager from failing the step — the
  // build's own "nasm not found" error is clearer.
  const nasmSetup =
    os === "windows" && arch === "x64"
      ? [
          "which nasm || (apt-get update -qq && apt-get install -y -qq nasm) || dnf install -y -q nasm || yum install -y -q nasm || true",
        ]
      : [];
  return {
    key: `${getTargetKey(platform)}-build-bun`,
    label: `${getTargetLabel(platform)} - build-bun`,
    agents: getBuildAgent(platform, options),
    retry: getRetry(),
    cancel_on_build_failing: isMergeQueue(),
    timeout_in_minutes: 60,
    env: {
      // ASAN runtime settings — unrelated to build config, affects the
      // linked binary's startup during the smoke test.
      ASAN_OPTIONS: "allow_user_segv_handler=1:disable_coredump=0:detect_leaks=0",
    },
    command: [...nasmSetup, getBuildCommand(platform, options, "build")],
  };
}

/**
 * Returns the artifact triplet for a platform, e.g. "bun-linux-aarch64" or "bun-linux-x64-musl-baseline".
 * Matches the naming convention in cmake/targets/BuildBun.cmake.
 * @param {Platform} platform
 * @returns {string}
 */
function getTargetTriplet(platform) {
  const { os, arch, abi, baseline } = platform;
  let triplet = `bun-${os}-${arch}`;
  if (abi === "musl") {
    triplet += "-musl";
  }
  if (abi === "android") {
    triplet += "-android";
  }
  if (baseline) {
    triplet += "-baseline";
  }
  return triplet;
}

/**
 * Returns true if a platform needs QEMU-based baseline CPU verification.
 * x64 baseline builds verify no AVX/AVX2 instructions snuck in.
 * aarch64 builds verify no LSE/SVE instructions snuck in.
 * @param {Platform} platform
 * @returns {boolean}
 */
function needsBaselineVerification(platform) {
  const { os, arch, abi, profile } = platform;
  // asan never ships. x64-android is emulator-only; aarch64-android keeps its
  // static LSE/SVE scan via --skip-emulation in getVerifyBaselineStep().
  if (profile === "asan") return false;
  if (os === "linux") return (arch === "x64" && abi !== "android") || arch === "aarch64";
  if (os === "windows") return arch === "x64";
  return false;
}

// Ubuntu 20.04's qemu 4.2 mis-emulates concurrent atomics in same-arch user mode; after #34009
// (mimalloc per-thread heaps) the SIMD baseline test segfaults/deadlocks in `_mi_theap_init`
// ~10-20% of x64 runs and ~5% of aarch64 runs. qemu 9.1 is 40/40 green. Static-pie binaries.
const PINNED_QEMU = {
  x64: {
    url: "https://github.com/ziglang/qemu-static/releases/download/9.1.0/qemu-linux-x86_64-9.1.0.tar.xz",
    sha256: "1ac92f632417d981810fda891e4a1b20f2d71f50f9ec705532afa8162b449c70",
    binary: "qemu-linux-x86_64-9.1.0/bin/qemu-x86_64",
  },
  aarch64: {
    url: "https://github.com/ziglang/qemu-static/releases/download/9.1.0/qemu-linux-aarch64-9.1.0.tar.xz",
    sha256: "5a82a96ac74932a802fb5753673beff27359faea8736286477b0bf2c268fd06d",
    binary: "qemu-linux-aarch64-9.1.0/bin/qemu-aarch64",
  },
};

/**
 * Returns the emulator binary name for the given platform.
 * Linux uses QEMU user-mode; Windows uses Intel SDE.
 * @param {Platform} platform
 * @returns {string}
 */
function getEmulatorBinary(platform) {
  const { os, arch } = platform;
  // Intel SDE is baked into the Windows image by scripts/bootstrap.ps1
  // (Install-IntelSde): downloadmirror.intel.com sits behind a bot challenge
  // that blocks non-browser clients, so it cannot be downloaded at job time.
  if (os === "windows") return "C:\\intel-sde\\sde.exe";
  // Fetched into the checkout root by the setup command below (see PINNED_QEMU).
  return `./${PINNED_QEMU[arch].binary}`;
}

/**
 * @param {Platform} platform
 * @param {PipelineOptions} options
 * @returns {Step}
 */
function hasWebKitChanges(options) {
  const { changedFiles = [] } = options;
  // Kept pointing at the removed SetupWebKit.cmake (always false) until
  // verify-baseline.ts's --jit-stress path is fixed: it runs wasm fixtures
  // without BUN_FEATURE_FLAG_INTERNAL_FOR_TESTING / parsed //@ flags, so
  // fixtures using wasm-GC types (bbq-osr-with-exceptions,
  // omg-tail-call-clobber-scratch-register) fail to parse under it.
  return changedFiles.some(file => file.includes("SetupWebKit.cmake"));
}

/**
 * Host platform the verify-baseline step runs on — per-TARGET-arch, not the
 * shared arm64 build host. Reuses test-fleet images (debian-13 / win-2019) so
 * no extra bake is needed; getPipeline() keys its build-image depends_on on this.
 * @param {Platform} platform
 * @returns {Platform}
 */
function getVerifyBaselineHost(platform) {
  const { os, arch, abi } = platform;
  if (os === "windows") return { os: "windows", arch, release: "2019" };
  if (abi === "musl") return { os: "linux", arch, abi: "musl", distro: "alpine", release: "3.23" };
  return { os: "linux", arch, distro: "debian", release: "13" };
}

/**
 * @param {Platform} platform
 * @param {PipelineOptions} options
 * @returns {Step}
 */
function getVerifyBaselineStep(platform, options) {
  const { os, abi } = platform;
  const targetKey = getTargetKey(platform);
  const triplet = getTargetTriplet(platform);
  const emulator = getEmulatorBinary(platform);
  const jitStressFlag = hasWebKitChanges(options) ? " --jit-stress" : "";
  // Android binaries need /system/bin/linker64 + a bionic sysroot, neither of which exist on the
  // build host, so qemu-user cannot load them; only the static instruction scan is meaningful.
  const skipEmulationFlag = abi === "android" ? " --skip-emulation" : "";

  // Scan bun-profile, not bun. The stripped binary has no .symtab (ELF) and
  // no companion .pdb (PE) — the static scanner would emit <no-symbol@addr>
  // for everything and none of the allowlist entries would match. bun-profile
  // has identical .text so violation results are the same, just attributable.
  const profileDir = `${triplet}-profile`;
  const profileExe = os === "windows" ? "bun-profile.exe" : "bun-profile";

  const setupCommands =
    os === "windows"
      ? [
          // cmd.exe batch does not stop on error: without `|| exit /b 1` a
          // failed line is ignored and only the last command's exit code
          // becomes the step result.
          `echo Downloading build artifacts...`,
          `buildkite-agent artifact download ${profileDir}.zip . --step ${targetKey}-build-bun || exit /b 1`,
          `echo Extracting ${profileDir}.zip...`,
          `tar -xf ${profileDir}.zip || exit /b 1`,
        ]
      : [
          `buildkite-agent artifact download '${profileDir}.zip' . --step ${targetKey}-build-bun`,
          `unzip -o '${profileDir}.zip'`,
          `chmod +x ${profileDir}/${profileExe}`,
          // Linux lanes pin a known-good qemu (see PINNED_QEMU). sha256 check makes a
          // truncated/hijacked download a hard failure before anything runs under it.
          ...(abi === "android"
            ? [] // --skip-emulation: no emulator needed
            : [
                `curl -fsSL --retry 5 --connect-timeout 15 --max-time 120 -o ./qemu.tar.xz '${PINNED_QEMU[platform.arch].url}'`,
                `echo '${PINNED_QEMU[platform.arch].sha256}  ./qemu.tar.xz' | sha256sum -c -`,
                `tar -xJf ./qemu.tar.xz '${PINNED_QEMU[platform.arch].binary}'`,
              ]),
        ];

  // verify-baseline is not a build lane: it stays on a host whose arch matches
  // the TARGET so PINNED_QEMU's host-arch-specific static binaries keep working
  // (the link agent is now always arm64 and can't run the x86_64-host qemu).
  const host = getVerifyBaselineHost(platform);
  const agents =
    os === "windows"
      ? getEc2Agent(host, options, { instanceType: getAzureVmSize("windows", platform.arch) })
      : getEc2Agent(host, options, {
          instanceType: platform.arch === "aarch64" ? "r8g.2xlarge" : "r7i.2xlarge",
        });

  return {
    key: `${targetKey}-verify-baseline`,
    label: `${getTargetLabel(platform)} - verify-baseline`,
    depends_on: [`${targetKey}-build-bun`],
    agents,
    retry: getRetry(),
    cancel_on_build_failing: isMergeQueue(),
    timeout_in_minutes: hasWebKitChanges(options) ? 30 : 10,
    command: [
      ...setupCommands,
      `cargo build --release --manifest-path scripts/verify-baseline-static/Cargo.toml${os === "windows" ? " || exit /b 1" : ""}`,
      `bun scripts/verify-baseline.ts --binary ${profileDir}/${profileExe} --arch ${platform.arch} --emulator ${emulator}${skipEmulationFlag}${jitStressFlag}`,
    ],
  };
}

/**
 * Targets whose build lane cross-compiles (so `canTraceOrderFile()` is false)
 * but whose test fleet is native. A `-trace-order` step runs there, downloads
 * the cross-built `bun-profile`, traces it, and uploads the `.order` artifact
 * that the next build's `inheritOrderFile()` picks up. One build of lag.
 *
 * linux-aarch64 is absent because its build lane runs on the aarch64 host and
 * traces itself; `packageAndUpload()` is its sole publisher.
 */
const traceOrderTargets = [
  { os: "darwin", arch: "aarch64", on: { os: "darwin", arch: "aarch64", release: "26", tier: "latest" } },
  { os: "linux", arch: "x64", on: { os: "linux", arch: "x64", distro: "debian", release: "13" } },
];

/**
 * Trace the symbol order file for a cross-compiled target on a native-arch
 * host, so the next build's `inheritOrderFile()` has something to download.
 *
 * The build lane cross-compiles from the aarch64 `buildHostPlatform` and cannot
 * run the binary it linked. This step runs on the target-arch test fleet,
 * downloads that lane's unstripped `bun-profile`, runs it under `scripts/
 * orderfile/generate.ts` (the traced binary doubles as the interpreter), and
 * uploads the result.
 *
 * Non-PR only — `orderFileEligible()` ignores PR builds, so a trace there has
 * no consumer. Soft-fail: the order file is an optimization, and a broken
 * tracer must not fail a build.
 * @param {Target} target
 * @param {Platform} tracePlatform
 * @param {PipelineOptions} options
 * @returns {CommandStep}
 */
function getTraceOrderStep(target, tracePlatform, options) {
  const targetKey = getTargetKey(target);
  const triplet = getTargetTriplet(target);
  const profileDir = `${triplet}-profile`;
  return {
    key: `${targetKey}-trace-order`,
    label: `${getTargetLabel(target)} - trace-order`,
    depends_on: [`${targetKey}-build-bun`],
    agents: getTestAgent(tracePlatform, options),
    retry: getRetry(),
    cancel_on_build_failing: isMergeQueue(),
    soft_fail: true,
    timeout_in_minutes: 15,
    command: [
      `buildkite-agent artifact download '${profileDir}.zip' . --step ${targetKey}-build-bun`,
      `unzip -o '${profileDir}.zip'`,
      `chmod +x ${profileDir}/bun-profile`,
      `./${profileDir}/bun-profile scripts/orderfile/generate.ts --build-dir=${profileDir} --out=${triplet}.order`,
      `buildkite-agent artifact upload '${triplet}.order'`,
    ],
  };
}

/**
 * @typedef {Object} TestOptions
 * @property {string} [buildId]
 * @property {string[]} [testFiles]
 * @property {boolean} [dryRun]
 */

/**
 * @param {Platform} platform
 * @param {PipelineOptions} options
 * @param {TestOptions} [testOptions]
 * @returns {Step}
 */
function getTestBunStep(platform, options, testOptions = {}) {
  const { os, profile } = platform;
  const { buildId, testFiles } = testOptions;

  const args = [`--step=${getTargetKey(platform)}-build-bun`];
  if (buildId) {
    args.push(`--build-id=${buildId}`);
  }

  if (testFiles?.length) {
    args.push(...testFiles.map(testFile => `--include=${testFile}`));
  } else {
    // platform-independent tsc check; runs in .github/workflows/bun-types.yml instead
    args.push("--exclude=integration/bun-types");
    // source-tree lints and build-script unit tests that never touch the built
    // binary; run in .github/workflows/source-lints.yml instead
    args.push("--exclude=internal/source-lints");
  }

  // The untiered darwin lane PR builds get (see prDarwinTestPlatforms) skips
  // the ~1% of files that take 10s or more; they are ~60% of a shard's wall
  // time and still run on every other PR lane and on main's darwin lanes.
  if (os === "darwin" && !platform.tier) {
    args.push("--skip-slower-than=10000");
  }

  const depends = [];
  if (!buildId) {
    depends.push(`${getTargetKey(platform)}-build-bun`);
  }

  return {
    key: `${getPlatformKey(platform)}-test-bun`,
    label: `${getPlatformLabel(platform)} - test-bun`,
    depends_on: depends,
    agents: getTestAgent(platform, options),
    retry: getRetry(),
    cancel_on_build_failing: isMergeQueue(),
    parallelism: os === "darwin" ? 2 : os === "windows" ? 8 : 20,
    timeout_in_minutes: profile === "asan" || os === "windows" || os === "darwin" ? 45 : 30,
    env: {
      ASAN_OPTIONS: "allow_user_segv_handler=1:disable_coredump=0:detect_leaks=0",
      // Platform smoke check: runner.node.mjs asserts the agent matches what
      // this step targets before running any test (see assertExpectedPlatform).
      // `release` is only asserted where the lane pins an exact version:
      // darwin aarch64 "previous" and darwin x64 intentionally float across
      // macOS versions, and the windows "2019" label doesn't match the
      // kernel-style version the agent reports.
      EXPECTED_PLATFORM_OS: platform.os,
      EXPECTED_PLATFORM_ARCH: platform.arch,
      ...(platform.abi ? { EXPECTED_PLATFORM_ABI: platform.abi } : {}),
      ...(platform.os === "linux" && platform.distro ? { EXPECTED_PLATFORM_DISTRO: platform.distro } : {}),
      ...(platform.os === "linux" ||
      (platform.os === "darwin" && platform.arch === "aarch64" && platform.tier === "latest")
        ? { EXPECTED_PLATFORM_RELEASE: platform.release }
        : {}),
    },
    command:
      os === "windows"
        ? `pwsh -NoProfile -File .\\scripts\\vs-shell.ps1 node .\\scripts\\runner.node.mjs ${args.join(" ")}`
        : `./scripts/runner.node.mjs ${args.join(" ")}`,
  };
}

/**
 * CI image lifecycle
 * ------------------
 * Build/test agents boot from pre-baked cloud images (AWS AMIs for Linux,
 * Azure Shared Image Gallery for Windows). The image a job requests is
 * `${getImageKey(platform)}-v${N}`, where N is the `# Version:` comment at the
 * top of scripts/bootstrap.sh (Linux) or scripts/bootstrap.ps1 (Windows).
 *
 * To change what's installed on a CI machine:
 *
 *   1. Edit bootstrap.sh / bootstrap.ps1 and bump its `# Version:` line.
 *   2. Open a PR whose **commit subject** contains `[build images]` (or
 *      `[build linux images]` / `[build windows images]` to scope it). This
 *      bakes throwaway `…-build-<buildNumber>` images and runs the full
 *      build+test pipeline against them so you can verify the change.
 *   3. Once green, amend/force-push the subject to `[publish images]` (or the
 *      scoped variant). This bakes the real `…-vN` images that normal CI will
 *      pick up. Publishing replaces the live tag in place — for Windows it
 *      deletes the existing gallery version before the new one finishes — so
 *      don't cancel a publish run mid-bake.
 *   4. Merge the PR **after** the publish run is green. By then the `…-vN`
 *      images already exist, so the post-merge `main` build runs immediately
 *      instead of everyone waiting 2-3 h on a bake.
 *
 * These tags are ignored on `main` — image bakes happen on the PR only.
 *
 * @param {Platform} platform
 * @param {PipelineOptions} options
 * @returns {Step}
 */
function getBuildImageStep(platform, options) {
  const { os, arch, distro, release, features } = platform;
  const { publishImages } = options;
  const action = publishImages ? "publish-image" : "create-image";

  const cloud = os === "windows" ? "azure" : "aws";
  const command = [
    "node",
    "./scripts/machine.mjs",
    action,
    `--os=${os}`,
    `--arch=${arch}`,
    distro && `--distro=${distro}`,
    `--release=${release}`,
    `--cloud=${cloud}`,
    "--ci",
    "--authorized-org=oven-sh",
  ];
  for (const feature of features || []) {
    command.push(`--feature=${feature}`);
  }

  return {
    key: `${getImageKey(platform)}-build-image`,
    label: `${getImageLabel(platform)} - build-image`,
    agents: {
      queue: "build-image",
    },
    env: {
      DEBUG: "1",
      // Packer needs several minutes to delete its temp Azure resources after a cancel;
      // the agent's default 10s grace SIGKILLs it mid-cleanup and leaks a full
      // VM/NIC/IP stack per retry. The agent reads this from job env — there's no
      // step-level property for it.
      BUILDKITE_SIGNAL_GRACE_PERIOD_SECONDS: `${10 * 60}`,
    },
    retry: getRetry(),
    cancel_on_build_failing: isMergeQueue(),
    command: command.filter(Boolean).join(" "),
    timeout_in_minutes: 3 * 60,
  };
}

/**
 * Batch-signs all Windows artifacts on an x64 agent. DigiCert smctl is x64-only
 * and silently fails under ARM64 emulation, so signing must happen here instead
 * of inline during each build. Re-uploads signed zips with the same names so
 * the release step picks them up transparently.
 * @param {Platform[]} windowsPlatforms
 * @param {PipelineOptions} options
 * @returns {Step}
 */
function getWindowsSignStep(windowsPlatforms, options) {
  // Each build-bun step produces two zips: <triplet>-profile.zip and <triplet>.zip
  const artifacts = [];
  const buildSteps = [];
  for (const platform of windowsPlatforms) {
    const triplet = getTargetTriplet(platform);
    const stepKey = `${getTargetKey(platform)}-build-bun`;
    artifacts.push(`${triplet}-profile.zip`, `${triplet}.zip`);
    buildSteps.push(stepKey, stepKey);
  }

  // Signing runs on a real Windows x64 machine (smctl; doesn't work on
  // ARM64) — the build platforms themselves are cross-compiled on Linux, so
  // the agent descriptor here is explicitly a native Windows box.
  return {
    key: "windows-sign",
    label: `${getBuildkiteEmoji("windows")} sign`,
    depends_on: windowsPlatforms.map(p => `${getTargetKey(p)}-build-bun`),
    agents: getEc2Agent({ os: "windows", arch: "x64", release: "2019" }, options, {
      instanceType: getAzureVmSize("windows", "x64", "test"),
    }),
    retry: getRetry(),
    cancel_on_build_failing: isMergeQueue(),
    command: [
      `powershell -NoProfile -ExecutionPolicy Bypass -File .buildkite/scripts/sign-windows-artifacts.ps1 ` +
        `-Artifacts ${artifacts.join(",")} ` +
        `-BuildSteps ${buildSteps.join(",")}`,
    ],
  };
}

/**
 * Aggregates stripped-binary sizes from every release build, compares them
 * against the latest main build's binary-sizes.json, and fails if any grew
 * past the threshold. Runs on PR builds (comparison) and main (record-only,
 * to produce the baseline artifact).
 *
 * @param {Platform[]} releasePlatforms
 * @param {PipelineOptions} options
 * @param {{ recordOnly: boolean }} [extra]
 * @returns {Step}
 */
function getBinarySizeStep(releasePlatforms, options, { recordOnly = false } = {}) {
  const targets = releasePlatforms.map(p => ({ triplet: getTargetTriplet(p) }));
  const args = [`--targets '${JSON.stringify(targets)}'`, `--threshold-mb ${BINARY_SIZE_THRESHOLD_MB}`];
  if (recordOnly) args.push("--no-fail");
  if (!options.canary) args.push("--release");

  return {
    key: "binary-size",
    label: `${getBuildkiteEmoji("package")} binary-size`,
    agents: getEc2Agent(buildHostPlatform, options, { instanceType: "c8g.large" }),
    depends_on: releasePlatforms.map(p => `${getTargetKey(p)}-build-bun`),
    allow_dependency_failure: true,
    soft_fail: !!options.skipSizeCheck,
    retry: {
      manual: { permit_on_passed: true },
      automatic: [{ exit_status: "*", limit: 2 }],
    },
    cancel_on_build_failing: isMergeQueue(),
    command: `bun scripts/binary-size.ts ${args.join(" ")}`,
  };
}

const BINARY_SIZE_THRESHOLD_MB = 0.5;

/**
 * @param {Platform[]} releasePlatforms
 * @param {PipelineOptions} options
 * @param {{ signed?: boolean, testStepKeys?: string[] }} [extra]
 * @returns {Step}
 */
function getReleaseStep(releasePlatforms, options, { signed = false, testStepKeys = [] } = {}) {
  const { canary } = options;
  const revision = typeof canary === "number" ? canary : 1;

  // When signing ran, depend on windows-sign instead of the raw Windows builds
  // so we wait for signed artifacts before releasing.
  const depends_on = signed
    ? [...releasePlatforms.filter(p => p.os !== "windows").map(p => `${getTargetKey(p)}-build-bun`), "windows-sign"]
    : releasePlatforms.map(platform => `${getTargetKey(platform)}-build-bun`);

  // Gate canary upload on green tests. A red test lane leaves the artifacts in
  // Buildkite but skips the GitHub/S3 upload; the next green main push ships.
  // [skip tests] on main still lets the release run (testStepKeys is empty).
  depends_on.push(...testStepKeys);

  return {
    key: "release",
    label: getBuildkiteEmoji("rocket"),
    agents: getEc2Agent(buildHostPlatform, options, { instanceType: "c8g.large" }),
    depends_on,
    env: {
      CANARY: revision,
      // Tells upload-release.sh to fetch Windows zips from the sign step
      // (same filenames, but the signed re-uploads are the ones we want).
      WINDOWS_ARTIFACT_STEP: signed ? "windows-sign" : "",
    },
    command: ".buildkite/scripts/upload-release.sh",
  };
}

/**
 * @typedef {Object} Pipeline
 * @property {Step[]} [steps]
 * @property {number} [priority]
 */

/**
 * @typedef {Record<string, string | undefined>} Agent
 */

/**
 * @typedef {GroupStep | CommandStep | BlockStep} Step
 */

/**
 * @typedef {Object} GroupStep
 * @property {string} key
 * @property {string} group
 * @property {Step[]} steps
 * @property {string[]} [depends_on]
 */

/**
 * @typedef {Object} CommandStep
 * @property {string} key
 * @property {string} [label]
 * @property {Record<string, string | undefined>} [agents]
 * @property {Record<string, string | undefined>} [env]
 * @property {string} command
 * @property {string[]} [depends_on]
 * @property {Record<string, string | undefined>} [retry]
 * @property {boolean} [cancel_on_build_failing]
 * @property {boolean} [soft_fail]
 * @property {number} [parallelism]
 * @property {number} [concurrency]
 * @property {string} [concurrency_group]
 * @property {number} [priority]
 * @property {number} [timeout_in_minutes]
 * @link https://buildkite.com/docs/pipelines/command-step
 */

/**
 * @typedef {Object} BlockStep
 * @property {string} key
 * @property {string} block
 * @property {string} [prompt]
 * @property {"passed" | "failed" | "running"} [blocked_state]
 * @property {(SelectInput | TextInput)[]} [fields]
 */

/**
 * @typedef {Object} TextInput
 * @property {string} key
 * @property {string} text
 * @property {string} [default]
 * @property {boolean} [required]
 * @property {string} [hint]
 */

/**
 * @typedef {Object} SelectInput
 * @property {string} key
 * @property {string} select
 * @property {string | string[]} [default]
 * @property {boolean} [required]
 * @property {boolean} [multiple]
 * @property {string} [hint]
 * @property {SelectOption[]} [options]
 */

/**
 * @typedef {Object} SelectOption
 * @property {string} label
 * @property {string} value
 */

/**
 * @typedef {Object} PipelineOptions
 * @property {string | boolean} [skipEverything]
 * @property {string | boolean} [skipBuilds]
 * @property {string | boolean} [skipTests]
 * @property {string | boolean} [skipSizeCheck]
 * @property {string | boolean} [forceBuilds]
 * @property {string | boolean} [forceTests]
 * @property {string | boolean} [buildImages]
 * @property {string | boolean} [signWindows]
 * @property {string | boolean} [publishImages]
 * @property {number} [canary]
 * @property {Platform[]} [buildPlatforms]
 * @property {Platform[]} [testPlatforms]
 * @property {string[]} [testFiles]
 * @property {string[]} [changedFiles]
 */

/**
 * @param {Step} step
 * @param {(string | undefined)[]} dependsOn
 * @returns {Step}
 */
function getStepWithDependsOn(step, ...dependsOn) {
  const { depends_on: existingDependsOn = [] } = step;
  return {
    ...step,
    depends_on: [...existingDependsOn, ...dependsOn.filter(Boolean)],
  };
}

/**
 * @returns {BlockStep}
 */
function getOptionsStep() {
  const booleanOptions = [
    {
      label: `${getEmoji("true")} Yes`,
      value: "true",
    },
    {
      label: `${getEmoji("false")} No`,
      value: "false",
    },
  ];

  return {
    key: "options",
    block: getBuildkiteEmoji("clipboard"),
    blocked_state: "running",
    fields: [
      {
        key: "canary",
        select: "If building, is this a canary build?",
        hint: "If you are building for a release, this should be false",
        required: false,
        default: "true",
        options: booleanOptions,
      },
      {
        key: "skip-builds",
        select: "Do you want to skip the build?",
        hint: "If true, artifacts will be downloaded from the last successful build",
        required: false,
        default: "false",
        options: booleanOptions,
      },
      {
        key: "skip-tests",
        select: "Do you want to skip the tests?",
        required: false,
        default: "false",
        options: booleanOptions,
      },
      {
        key: "force-builds",
        select: "Do you want to force run the build?",
        hint: "If true, the build will run even if no source files have changed",
        required: false,
        default: "false",
        options: booleanOptions,
      },
      {
        key: "force-tests",
        select: "Do you want to force run the tests?",
        hint: "If true, the tests will run even if no test files have changed",
        required: false,
        default: "false",
        options: booleanOptions,
      },
      {
        key: "build-profiles",
        select: "If building, which profiles do you want to build?",
        required: false,
        multiple: true,
        default: ["release"],
        options: [
          {
            label: `${getEmoji("release")} Release`,
            value: "release",
          },
          {
            label: `${getEmoji("assert")} Release with Assertions`,
            value: "assert",
          },
          {
            label: `${getEmoji("asan")} Release with ASAN`,
            value: "asan",
          },
          {
            label: `${getEmoji("debug")} Debug`,
            value: "debug",
          },
        ],
      },
      {
        key: "build-platforms",
        select: "If building, which platforms do you want to build?",
        hint: "If this is left blank, all platforms are built",
        required: false,
        multiple: true,
        default: [],
        options: buildPlatforms.map(platform => {
          const { os, arch, abi, baseline } = platform;
          let label = `${getEmoji(os)} ${arch}`;
          if (abi) {
            label += `-${abi}`;
          }
          if (baseline) {
            label += `-baseline`;
          }
          return {
            label,
            value: getTargetKey(platform),
          };
        }),
      },
      {
        key: "test-platforms",
        select: "If testing, which platforms do you want to test?",
        hint: "If this is left blank, all platforms are tested",
        required: false,
        multiple: true,
        default: [],
        // One option per distinct image — the baseline/profile variants collapse
        // into the first (plain) entry since profiles come from `build-profiles`.
        // The option value must be that entry's *platform* key: it's what
        // getPipelineOptions() resolves through testPlatformsMap, and the image
        // key isn't a platform key.
        options: testPlatforms
          .filter((platform, index, array) => index === array.findIndex(p => getImageKey(p) === getImageKey(platform)))
          .map(platform => {
            const { os, arch, abi, distro, release } = platform;
            let label = `${getEmoji(os)} ${arch}`;
            if (abi) {
              label += `-${abi}`;
            }
            if (distro) {
              label += ` ${distro}`;
            }
            if (release) {
              label += ` ${release}`;
            }
            return {
              label,
              value: getPlatformKey(platform),
            };
          }),
      },
      {
        key: "test-files",
        text: "If testing, which files do you want to test?",
        hint: "If specified, only run test paths that include the list of strings (e.g. 'test/js', 'test/cli/hot/watch.ts')",
        required: false,
      },
      {
        key: "build-images",
        select: "Do you want to re-build the base images?",
        hint: "This can take 2-3 hours to complete, only do so if you've tested locally",
        required: false,
        default: "false",
        options: booleanOptions,
      },
      {
        key: "publish-images",
        select: "Do you want to re-build and publish the base images?",
        hint: "This can take 2-3 hours to complete, only do so if you've tested locally",
        required: false,
        default: "false",
        options: booleanOptions,
      },
    ],
  };
}

/**
 * @returns {Step}
 */
function getOptionsApplyStep() {
  const command = getEnv("BUILDKITE_COMMAND");
  return {
    key: "options-apply",
    label: getBuildkiteEmoji("gear"),
    command: `${command} --apply`,
    depends_on: ["options"],
    agents: {
      queue: getEnv("BUILDKITE_AGENT_META_DATA_QUEUE", false),
    },
  };
}

/**
 * @returns {Promise<PipelineOptions | undefined>}
 */
async function getPipelineOptions() {
  const isManual = isBuildManual();
  if (isManual && !process.argv.includes("--apply")) {
    return;
  }

  let filteredBuildPlatforms = buildPlatforms;
  if (isMainBranch()) {
    filteredBuildPlatforms = buildPlatforms.filter(({ profile }) => profile !== "asan");
  }

  const canary = await getCanaryRevision();
  const buildPlatformsMap = new Map(filteredBuildPlatforms.map(platform => [getTargetKey(platform), platform]));
  const testPlatformsMap = new Map(testPlatforms.map(platform => [getPlatformKey(platform), platform]));

  if (isManual) {
    const { fields } = getOptionsStep();
    const keys = fields?.map(({ key }) => key) ?? [];
    const values = await Promise.all(keys.map(getBuildMetadata));
    const options = Object.fromEntries(keys.map((key, index) => [key, values[index]]));

    /**
     * @param {string} value
     * @returns {string[] | undefined}
     */
    const parseArray = value =>
      value
        ?.split("\n")
        ?.map(item => item.trim())
        ?.filter(Boolean);

    const buildProfiles = parseArray(options["build-profiles"]);
    const buildPlatformKeys = parseArray(options["build-platforms"]);
    const testPlatformKeys = parseArray(options["test-platforms"]);
    return {
      canary: parseBoolean(options["canary"]) ? canary : 0,
      skipBuilds: parseBoolean(options["skip-builds"]),
      forceBuilds: parseBoolean(options["force-builds"]),
      skipTests: parseBoolean(options["skip-tests"]),
      buildImages: parseBoolean(options["build-images"]),
      publishImages: parseBoolean(options["publish-images"]),
      testFiles: parseArray(options["test-files"]),
      buildPlatforms: buildPlatformKeys?.length
        ? buildPlatformKeys.flatMap(key => buildProfiles.map(profile => ({ ...buildPlatformsMap.get(key), profile })))
        : Array.from(buildPlatformsMap.values()),
      testPlatforms: testPlatformKeys?.length
        ? testPlatformKeys.flatMap(key => buildProfiles.map(profile => ({ ...testPlatformsMap.get(key), profile })))
        : Array.from(testPlatformsMap.values()),
      dryRun: parseBoolean(options["dry-run"]),
    };
  }

  // BUILDKITE_MESSAGE is the commit subject line only — option tags like
  // [publish images] must appear in the subject, not the commit body.
  const commitMessage = getCommitMessage();

  /**
   * @param {RegExp} pattern
   * @returns {string | boolean}
   */
  const parseOption = pattern => {
    const match = pattern.exec(commitMessage);
    if (match) {
      const [, value] = match;
      return value;
    }
    return false;
  };

  const isCanary =
    !parseBoolean(getEnv("RELEASE", false) || "false") &&
    !/\[(release|build release|release build)\]/i.test(commitMessage);

  let buildImages = parseOption(/\[(build (?:(?:windows|linux) )?images?)\]/i);
  let publishImages = parseOption(/\[(publish (?:(?:windows|linux) )?images?)\]/i);
  let imageFilter = (commitMessage.match(/\[(?:build|publish) (windows|linux) images?\]/i) || [])[1]?.toLowerCase();

  // Image bake/publish is meant to happen on the PR; the squash-merge commit
  // subject often still carries the [publish images] tag, which would re-run
  // the multi-hour bake on main and (because publish replaces the live image
  // tag) briefly delete the images CI runs on. Ignore the tag on main and run
  // a normal build instead.
  if (isMainBranch() && (buildImages || publishImages)) {
    console.log(`Ignoring [${publishImages || buildImages}] on main branch — images are built and published from PRs.`);
    buildImages = false;
    publishImages = false;
    imageFilter = undefined;
  }

  return {
    canary: isCanary ? canary : 0,
    skipEverything: parseOption(/\[(skip ci|no ci)\]/i),
    skipBuilds: parseOption(/\[(skip builds?|no builds?|only tests?)\]/i),
    forceBuilds: parseOption(/\[(force builds?)\]/i),
    skipTests: parseOption(/\[(skip tests?|no tests?|only builds?)\]/i),
    skipSizeCheck: parseOption(/\[(skip size( check)?|allow size)\]/i),
    signWindows: parseOption(/\[(sign windows)\]/i),
    buildImages,
    dryRun: parseOption(/\[(dry run)\]/i),
    publishImages,
    imageFilter,
    buildPlatforms: Array.from(buildPlatformsMap.values()),
    testPlatforms: Array.from(testPlatformsMap.values()),
  };
}

/**
 * @param {PipelineOptions} [options]
 * @returns {Promise<Pipeline | undefined>}
 */
async function getPipeline(options = {}) {
  const priority = getPriority();

  if (isBuildManual() && !Object.keys(options).length) {
    return {
      priority,
      steps: [getOptionsStep(), getOptionsApplyStep()],
    };
  }

  const { skipEverything } = options;
  if (skipEverything) {
    return;
  }

  const { buildPlatforms = [], testPlatforms = [], buildImages, publishImages, imageFilter } = options;
  // Every build lane runs on buildHostPlatform (see getBuildAgent),
  // so the build-image set is exactly {buildHostPlatform} ∪ testPlatforms' native
  // images — buildPlatforms entries encode TARGET os/arch/abi, not a host image.
  const imagePlatforms = new Map(
    buildImages || publishImages
      ? [buildHostPlatform, ...testPlatforms]
          // darwin: no cloud images (bare-metal test fleet only).
          .filter(({ os }) => os !== "darwin")
          .filter(({ os, distro }) => !imageFilter || os === imageFilter || distro === imageFilter)
          .map(platform => [getImageKey(platform), platform])
      : [],
  );

  /** @type {Step[]} */
  const steps = [];

  if (imagePlatforms.size) {
    steps.push({
      key: "build-images",
      group: getBuildkiteEmoji("aws"),
      steps: [...imagePlatforms.values()].map(platform => getBuildImageStep(platform, options)),
    });
  }

  let { skipBuilds, forceBuilds, dryRun } = options;
  dryRun = dryRun || !!buildImages;

  /** @type {string | undefined} */
  let buildId;
  if (skipBuilds && !forceBuilds) {
    const lastBuild = await getLastSuccessfulBuild();
    if (lastBuild) {
      const { id } = lastBuild;
      buildId = id;
    } else {
      console.warn("No last successful build found, must force builds...");
    }
  }

  const includeASAN = !isMainBranch();

  if (!buildId) {
    let relevantBuildPlatforms = includeASAN
      ? buildPlatforms
      : buildPlatforms.filter(({ profile }) => profile !== "asan");

    steps.push(
      ...relevantBuildPlatforms.map(target => {
        // build-bun always runs on buildHostPlatform regardless of
        // target, so the only build-image dependency is the host's.
        const imageKey = getImageKey(buildHostPlatform);
        const dependsOn = [];
        if (imagePlatforms.has(imageKey)) {
          dependsOn.push(`${imageKey}-build-image`);
        }

        const steps = [getBuildBunStep(target, options)];

        if (needsBaselineVerification(target)) {
          // verify-baseline runs on a per-target-arch native host (see
          // getVerifyBaselineHost), not buildHostPlatform; its image dep goes
          // on the step itself so build-bun doesn't wait for it.
          const verifyImageKey = getImageKey(getVerifyBaselineHost(target));
          const verifyDeps =
            verifyImageKey !== imageKey && imagePlatforms.has(verifyImageKey) ? [`${verifyImageKey}-build-image`] : [];
          steps.push(getStepWithDependsOn(getVerifyBaselineStep(target, options), ...verifyDeps));
        }

        // Seed the symbol order file for a cross-compiled target on its native
        // test fleet (see getTraceOrderStep). Always on main so the inheritance
        // chain stays fed, and anywhere else on commit-message opt-in so a PR
        // that changes the tracer can prove the step works before merge — the
        // same `[generate symbol order]` tag ci.ts already honours. Release
        // profile only — usesOrderFile() is false under a sanitizer anyway.
        const traceOn = traceOrderTargets.find(
          t =>
            t.os === target.os && t.arch === target.arch && !target.abi && (target.profile ?? "release") === "release",
        );
        if (traceOn && (isMainBranch() || /\[generate symbol order\]/i.test(getCommitMessage()))) {
          // The trace host's image, same as verify-baseline: on the step, so
          // build-bun doesn't wait for it. Darwin has no cloud image.
          const traceImageKey = getImageKey(traceOn.on);
          const traceDeps =
            traceImageKey !== imageKey && imagePlatforms.has(traceImageKey) ? [`${traceImageKey}-build-image`] : [];
          steps.push(getStepWithDependsOn(getTraceOrderStep(target, traceOn.on, options), ...traceDeps));
        }

        return getStepWithDependsOn(
          {
            key: getTargetKey(target),
            group: getTargetLabel(target),
            steps,
          },
          ...dependsOn,
        );
      }),
    );
  }

  // Tests run on main too so the canary release step below can gate on them.
  // ASAN is PR-only (see includeASAN above), so the asan test lane is dropped
  // on main along with its build.
  // Untiered: any arm64 mac agent, whatever macOS it runs, can take it.
  /** @type {Platform[]} */
  const prDarwinTestPlatforms = [{ os: "darwin", arch: "aarch64", release: "any" }];
  const darwinTestsEnabled = isMainBranch() || isBuildManual() || /\[(macos|darwin) tests?\]/i.test(getCommitMessage());
  const relevantTestPlatforms = (
    includeASAN ? testPlatforms : testPlatforms.filter(({ profile }) => profile !== "asan")
  )
    .filter(({ os }) => os !== "darwin" || darwinTestsEnabled)
    .concat(darwinTestsEnabled ? [] : prDarwinTestPlatforms);
  /** @type {string[]} */
  const testStepKeys = [];
  {
    const { skipTests, forceTests, testFiles } = options;
    if (!skipTests || forceTests) {
      steps.push(
        ...relevantTestPlatforms.map(target => {
          const step = getTestBunStep(target, options, { testFiles, buildId });
          testStepKeys.push(step.key);
          // Test shards run on their native platform image; on [build images]
          // runs they must wait for that freshly-baked image before starting.
          const imageKey = getImageKey(target);
          const dependsOn = imagePlatforms.has(imageKey) ? [`${imageKey}-build-image`] : [];
          return getStepWithDependsOn(
            {
              key: getPlatformKey(target),
              group: getPlatformLabel(target),
              steps: [step],
            },
            ...dependsOn,
          );
        }),
      );
    }
  }

  // Binary-size tracking: main records the baseline, PRs enforce the threshold.
  const strippedPlatforms = buildPlatforms.filter(p => (p.profile ?? "release") === "release");
  if (!buildId && strippedPlatforms.length) {
    steps.push(getBinarySizeStep(strippedPlatforms, options, { recordOnly: isMainBranch() }));
  }

  // Sign Windows builds on release (non-canary main) or when [sign windows]
  // is in the commit message (for testing the sign step on a branch).
  // DigiCert charges per signature, so canary builds are never signed.
  const shouldSignWindows = (isMainBranch() && !options.canary) || options.signWindows;
  if (shouldSignWindows) {
    const windowsPlatforms = buildPlatforms.filter(p => p.os === "windows");
    if (windowsPlatforms.length > 0) {
      // Signing runs on a native Windows x64 box — on [build images] runs it
      // requests the freshly baked native Windows image, so wait for it.
      steps.push(
        getStepWithDependsOn(
          getWindowsSignStep(windowsPlatforms, options),
          imagePlatforms.has("windows-x64-2019") ? "windows-x64-2019-build-image" : undefined,
        ),
      );
    }
  }

  if (isMainBranch()) {
    steps.push(getReleaseStep(buildPlatforms, options, { signed: shouldSignWindows, testStepKeys }));
  }

  /** @type {Map<string, GroupStep>} */
  const stepsByGroup = new Map();

  for (let i = 0; i < steps.length; i++) {
    const step = steps[i];
    if (!("group" in step)) {
      continue;
    }

    const { group, steps: groupSteps } = step;
    if (stepsByGroup.has(group)) {
      stepsByGroup.get(group).steps.push(...groupSteps);
    } else {
      stepsByGroup.set(group, step);
    }

    steps[i] = undefined;
  }

  return {
    priority,
    steps: [...steps.filter(step => typeof step !== "undefined"), ...Array.from(stepsByGroup.values())],
  };
}

async function main() {
  startGroup("Generating options...");
  const options = await getPipelineOptions();
  if (options) {
    console.log("Generated options:", options);
  }

  startGroup("Querying GitHub for files...");
  if (options && isBuildkite && !isMainBranch()) {
    /** @type {string[]} */
    let allFiles = [];
    /** @type {string[]} */
    let newFiles = [];
    let prFileCount = 0;
    try {
      console.log("on buildkite: collecting new files from PR");
      const per_page = 50;
      const { BUILDKITE_PULL_REQUEST } = process.env;
      for (let i = 1; i <= 10; i++) {
        const res = await fetch(
          `https://api.github.com/repos/oven-sh/bun/pulls/${BUILDKITE_PULL_REQUEST}/files?per_page=${per_page}&page=${i}`,
          { headers: { Authorization: `Bearer ${getSecret("GITHUB_TOKEN")}` } },
        );
        const doc = await res.json();
        if (!Array.isArray(doc)) {
          console.error(`-> page ${i}, unexpected response:`, JSON.stringify(doc));
          break;
        }
        console.log(`-> page ${i}, found ${doc.length} items`);
        if (doc.length === 0) break;
        for (const { filename, status } of doc) {
          prFileCount += 1;
          allFiles.push(filename);
          if (status !== "added") continue;
          newFiles.push(filename);
        }
        if (doc.length < per_page) break;
      }
      console.log(`- PR ${BUILDKITE_PULL_REQUEST}, ${prFileCount} files, ${newFiles.length} new files`);
    } catch (e) {
      console.error(e);
    }
    if (allFiles.length > 0 && allFiles.every(filename => filename.startsWith("docs/"))) {
      console.log(`- PR is only docs, skipping tests!`);
      return;
    }
    options.changedFiles = allFiles;
    // Publish the file lists as build meta-data so each test shard can read
    // them instead of re-querying GitHub. With ~150 shards per build, this
    // is the difference between 1 API call and 150, and the per-shard calls
    // were exhausting the token's hourly rate limit under load.
    if (allFiles.length > 0) {
      await setBuildMetadata("pr-all-files", JSON.stringify(allFiles));
      await setBuildMetadata("pr-new-files", JSON.stringify(newFiles));
    }
  }

  startGroup("Generating pipeline...");
  const pipeline = await getPipeline(options);
  if (!pipeline) {
    console.log("Generated pipeline is empty, skipping...");
    return;
  }

  const content = toYaml(pipeline);
  const contentPath = join(process.cwd(), ".buildkite", "ci.yml");
  writeFile(contentPath, content);

  console.log("Generated pipeline:");
  console.log(" - Path:", contentPath);
  console.log(" - Size:", (content.length / 1024).toFixed(), "KB");

  if (isBuildkite) {
    startGroup("Uploading pipeline...");
    try {
      await spawnSafe(["buildkite-agent", "pipeline", "upload", contentPath], { stdio: "inherit" });
    } finally {
      await uploadArtifact(contentPath);
    }
  }
}

await main();