using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Threading;
using Microsoft.CodeAnalysis.CSharp.Symbols;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Roslyn.Utilities;

namespace Microsoft.CodeAnalysis.CSharp;

internal abstract class WithExternAndUsingAliasesBinder : WithExternAliasesBinder
{
	private sealed class FromSyntax : WithExternAndUsingAliasesBinder
	{
		private readonly SourceNamespaceSymbol _declaringSymbol;

		private readonly CSharpSyntaxNode _declarationSyntax;

		private ImmutableArray<AliasAndExternAliasDirective> _lazyExternAliases;

		private ImmutableArray<AliasAndUsingDirective> _lazyUsingAliases;

		private ImmutableDictionary<string, AliasAndUsingDirective>? _lazyUsingAliasesMap;

		private QuickAttributeChecker? _lazyQuickAttributeChecker;

		internal sealed override ImmutableArray<AliasAndExternAliasDirective> ExternAliases
		{
			get
			{
				if (_lazyExternAliases.IsDefault)
				{
					ImmutableInterlocked.InterlockedInitialize(ref _lazyExternAliases, _declaringSymbol.GetExternAliases(_declarationSyntax));
				}
				return _lazyExternAliases;
			}
		}

		internal override ImmutableArray<AliasAndUsingDirective> UsingAliases
		{
			get
			{
				if (_lazyUsingAliases.IsDefault)
				{
					ImmutableInterlocked.InterlockedInitialize(ref _lazyUsingAliases, _declaringSymbol.GetUsingAliases(_declarationSyntax, null));
				}
				return _lazyUsingAliases;
			}
		}

		internal override QuickAttributeChecker QuickAttributeChecker
		{
			get
			{
				//IL_00ca: Unknown result type (might be due to invalid IL or missing references)
				//IL_00cf: Unknown result type (might be due to invalid IL or missing references)
				//IL_00c1: Unknown result type (might be due to invalid IL or missing references)
				//IL_00c6: Unknown result type (might be due to invalid IL or missing references)
				//IL_00df: Unknown result type (might be due to invalid IL or missing references)
				//IL_00ab: Unknown result type (might be due to invalid IL or missing references)
				if (_lazyQuickAttributeChecker == null)
				{
					QuickAttributeChecker quickAttributeChecker = base.Next.QuickAttributeChecker;
					CSharpSyntaxNode declarationSyntax = _declarationSyntax;
					SyntaxList<UsingDirectiveSyntax> usings;
					if (!(declarationSyntax is CompilationUnitSyntax compilationUnitSyntax))
					{
						if (!(declarationSyntax is BaseNamespaceDeclarationSyntax baseNamespaceDeclarationSyntax))
						{
							throw ExceptionUtilities.UnexpectedValue((object)_declarationSyntax);
						}
						usings = baseNamespaceDeclarationSyntax.Usings;
					}
					else
					{
						ImmutableArray<SingleNamespaceDeclaration>.Enumerator enumerator = ((SourceNamespaceSymbol)base.Compilation.SourceModule.GlobalNamespace).MergedDeclaration.Declarations.GetEnumerator();
						while (enumerator.MoveNext())
						{
							SingleNamespaceDeclaration current = enumerator.Current;
							if (current.HasGlobalUsings && compilationUnitSyntax.SyntaxTree != current.SyntaxReference.SyntaxTree)
							{
								quickAttributeChecker = quickAttributeChecker.AddAliasesIfAny(((CompilationUnitSyntax)(object)current.SyntaxReference.GetSyntax(default(CancellationToken))).Usings, onlyGlobalAliases: true);
							}
						}
						usings = compilationUnitSyntax.Usings;
					}
					quickAttributeChecker = quickAttributeChecker.AddAliasesIfAny(usings);
					_lazyQuickAttributeChecker = quickAttributeChecker;
				}
				return _lazyQuickAttributeChecker;
			}
		}

		internal FromSyntax(SourceNamespaceSymbol declaringSymbol, CSharpSyntaxNode declarationSyntax, WithUsingNamespacesAndTypesBinder next)
			: base(next)
		{
			_declaringSymbol = declaringSymbol;
			_declarationSyntax = declarationSyntax;
		}

		protected override ImmutableDictionary<string, AliasAndUsingDirective> GetUsingAliasesMap(ConsList<TypeSymbol>? basesBeingResolved)
		{
			if (_lazyUsingAliasesMap == null)
			{
				Interlocked.CompareExchange(ref _lazyUsingAliasesMap, _declaringSymbol.GetUsingAliasesMap(_declarationSyntax, basesBeingResolved), null);
			}
			return _lazyUsingAliasesMap;
		}

		protected override ImportChain BuildImportChain()
		{
			ImportChain parentOpt = base.Next.ImportChain;
			if (_declarationSyntax is BaseNamespaceDeclarationSyntax baseNamespaceDeclarationSyntax)
			{
				for (NameSyntax nameSyntax = baseNamespaceDeclarationSyntax.Name; nameSyntax is QualifiedNameSyntax qualifiedNameSyntax; nameSyntax = qualifiedNameSyntax.Left)
				{
					parentOpt = new ImportChain(Imports.Empty, parentOpt);
				}
			}
			return new ImportChain(_declaringSymbol.GetImports(_declarationSyntax, null), parentOpt);
		}
	}

	private sealed class FromSymbols : WithExternAndUsingAliasesBinder
	{
		private readonly ImmutableArray<AliasAndExternAliasDirective> _externAliases;

		private readonly ImmutableDictionary<string, AliasAndUsingDirective> _usingAliases;

		internal override ImmutableArray<AliasAndExternAliasDirective> ExternAliases => _externAliases;

		internal override ImmutableArray<AliasAndUsingDirective> UsingAliases => EnumerableExtensions.SelectAsArray<KeyValuePair<string, AliasAndUsingDirective>, AliasAndUsingDirective>((IReadOnlyCollection<KeyValuePair<string, AliasAndUsingDirective>>)_usingAliases, (Func<KeyValuePair<string, AliasAndUsingDirective>, AliasAndUsingDirective>)((KeyValuePair<string, AliasAndUsingDirective> pair) => pair.Value));

		internal FromSymbols(ImmutableArray<AliasAndExternAliasDirective> externAliases, ImmutableDictionary<string, AliasAndUsingDirective> usingAliases, WithUsingNamespacesAndTypesBinder next)
			: base(next)
		{
			_externAliases = externAliases;
			_usingAliases = usingAliases;
		}

		protected override ImmutableDictionary<string, AliasAndUsingDirective> GetUsingAliasesMap(ConsList<TypeSymbol>? basesBeingResolved)
		{
			return _usingAliases;
		}

		protected override ImportChain BuildImportChain()
		{
			return new ImportChain(Imports.Create(_usingAliases, ((WithUsingNamespacesAndTypesBinder)base.Next).GetUsings(null), _externAliases), base.Next.ImportChain);
		}
	}

	private ImportChain? _lazyImportChain;

	internal abstract override ImmutableArray<AliasAndUsingDirective> UsingAliases { get; }

	internal override ImportChain ImportChain
	{
		get
		{
			if (_lazyImportChain == null)
			{
				Interlocked.CompareExchange(ref _lazyImportChain, BuildImportChain(), null);
			}
			return _lazyImportChain;
		}
	}

	protected WithExternAndUsingAliasesBinder(WithUsingNamespacesAndTypesBinder next)
		: base(next)
	{
	}

	protected abstract ImmutableDictionary<string, AliasAndUsingDirective> GetUsingAliasesMap(ConsList<TypeSymbol>? basesBeingResolved);

	internal override void LookupSymbolsInSingleBinder(LookupResult result, string name, int arity, ConsList<TypeSymbol> basesBeingResolved, LookupOptions options, Binder originalBinder, bool diagnose, ref CompoundUseSiteInfo<AssemblySymbol> useSiteInfo)
	{
		LookupSymbolInAliases(GetUsingAliasesMap(basesBeingResolved), ExternAliases, originalBinder, result, name, arity, basesBeingResolved, options, diagnose, ref useSiteInfo);
	}

	internal override void AddLookupSymbolsInfoInSingleBinder(LookupSymbolsInfo result, LookupOptions options, Binder originalBinder)
	{
		if ((options & LookupOptions.LabelsOnly) == 0)
		{
			AddLookupSymbolsInfoInAliases(GetUsingAliasesMap(null), ExternAliases, result, options, originalBinder);
		}
	}

	protected abstract ImportChain BuildImportChain();

	internal bool IsUsingAlias(string name, bool callerIsSemanticModel, ConsList<TypeSymbol>? basesBeingResolved)
	{
		return IsUsingAlias(GetUsingAliasesMap(basesBeingResolved), name, callerIsSemanticModel);
	}

	[Obsolete("Use other overloads", true)]
	internal new static WithExternAndUsingAliasesBinder Create(SourceNamespaceSymbol declaringSymbol, CSharpSyntaxNode declarationSyntax, Binder next)
	{
		throw ExceptionUtilities.Unreachable("/_/src/Compilers/CSharp/Portable/Binder/WithExternAndUsingAliasesBinder.cs", 95);
	}

	internal static WithExternAndUsingAliasesBinder Create(SourceNamespaceSymbol declaringSymbol, CSharpSyntaxNode declarationSyntax, WithUsingNamespacesAndTypesBinder next)
	{
		return new FromSyntax(declaringSymbol, declarationSyntax, next);
	}

	internal static WithExternAndUsingAliasesBinder Create(ImmutableArray<AliasAndExternAliasDirective> externAliases, ImmutableDictionary<string, AliasAndUsingDirective> usingAliases, WithUsingNamespacesAndTypesBinder next)
	{
		return new FromSymbols(externAliases, usingAliases, next);
	}
}