// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using Microsoft.CodeAnalysis.CodeStyle;
using Microsoft.CodeAnalysis.Options;
using Microsoft.CodeAnalysis.Diagnostics.Analyzers.NamingStyles;
 
#if !CODE_STYLE
using System.Collections.Immutable;
using Microsoft.CodeAnalysis.Diagnostics;
using Microsoft.CodeAnalysis.Test.Utilities;
using System.Linq;
using Xunit;
#endif
 
#if !NETCOREAPP
using System;
using Roslyn.Utilities;
using System.Text;
#endif
 
namespace Microsoft.CodeAnalysis.Editor.UnitTests.CodeActions;
 
internal sealed class OptionsCollection(string languageName) : IReadOnlyCollection<KeyValuePair<OptionKey2, object?>>, IOptionsReader
{
    private readonly Dictionary<OptionKey2, object?> _options = [];
 
    public string LanguageName => languageName;
    public string DefaultExtension => languageName == LanguageNames.CSharp ? "cs" : "vb";
 
    public int Count => _options.Count;
 
    public void Add<T>(OptionKey2 optionKey, T value)
    {
        // Can only add internally defined option whose storage is not mapped to another option:
        Debug.Assert(optionKey.Option is IOption2 { Definition.StorageMapping: null });
        _options.Add(optionKey, value);
    }
 
    public void Set<T>(Option2<T> option, T value)
        => _options[new OptionKey2(option)] = value;
 
    public void Add<T>(Option2<T> option, T value)
        => Add(new OptionKey2(option), value);
 
    public void Add<T>(Option2<CodeStyleOption2<T>> option, T value)
        => Add(option, value, option.DefaultValue.Notification);
 
    public void Add<T>(Option2<CodeStyleOption2<T>> option, T value, NotificationOption2 notification)
        => Add(new OptionKey2(option), new CodeStyleOption2<T>(value, notification));
 
    public void Add<T>(PerLanguageOption2<T> option, T value)
        => Add(new OptionKey2(option, languageName), value);
 
    public void Add<T>(PerLanguageOption2<CodeStyleOption2<T>> option, T value)
        => Add(option, value, option.DefaultValue.Notification);
 
    public void Add<T>(PerLanguageOption2<CodeStyleOption2<T>> option, T value, NotificationOption2 notification)
        => Add(new OptionKey2(option, languageName), new CodeStyleOption2<T>(value, notification));
 
    // 📝 This can be removed if/when collection initializers support AddRange.
    public void Add(OptionsCollection? options)
        => AddRange(options);
 
    public void AddRange(IEnumerable<KeyValuePair<OptionKey2, object?>>? options)
    {
        if (options == null)
            return;
 
        foreach (var (key, value) in options)
            _options.Add(key, value);
    }
 
    public IEnumerator<KeyValuePair<OptionKey2, object?>> GetEnumerator()
        => _options.GetEnumerator();
 
    IEnumerator IEnumerable.GetEnumerator()
        => GetEnumerator();
 
#if !CODE_STYLE
    public OptionSet ToOptionSet()
        => new TestOptionSet(_options.ToImmutableDictionary(entry => new OptionKey(entry.Key.Option, entry.Key.Language), entry => entry.Value));
 
    public void SetGlobalOptions(IGlobalOptionService globalOptions)
    {
        foreach (var (optionKey, value) in _options)
        {
            globalOptions.SetGlobalOption(optionKey, value);
        }
    }
 
    public StructuredAnalyzerConfigOptions ToAnalyzerConfigOptions()
    {
        Assert.All(this, o => Assert.True(o.Key.Option.Definition.IsEditorConfigOption));
 
        var builder = ImmutableDictionary.CreateBuilder<string, string>(AnalyzerConfigOptions.KeyComparer);
 
        foreach (var (key, value) in this)
        {
            if (value is NamingStylePreferences namingPreferences)
            {
                NamingStylePreferencesEditorConfigSerializer.WriteNamingStylePreferencesToEditorConfig(
                    namingPreferences.SymbolSpecifications,
                    namingPreferences.NamingStyles,
                    namingPreferences.Rules.NamingRules,
                    LanguageName,
                    entryWriter: builder.Add,
                    triviaWriter: null,
                    setPrioritiesToPreserveOrder: false);
            }
            else
            {
                builder.Add(key.Option.Definition.ConfigName, key.Option.Definition.Serializer.Serialize(value));
            }
        }
 
        return StructuredAnalyzerConfigOptions.Create(new DictionaryAnalyzerConfigOptions(builder.ToImmutable()));
    }
#endif
 
    public bool TryGetOption<T>(OptionKey2 optionKey, out T value)
    {
        if (_options.TryGetValue(optionKey, out var objValue))
        {
            value = (T)objValue!;
            return true;
        }
 
        value = default!;
        return false;
    }
}