// 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;
using System.Runtime.CompilerServices;
using Microsoft.CodeAnalysis.Editor.EditorConfigSettings.Updater;
using Microsoft.CodeAnalysis.Options;
 
namespace Microsoft.CodeAnalysis.Editor.EditorConfigSettings.Data;
 
internal abstract class Setting
{
    public OptionKey2 Key { get; }
    public OptionUpdater Updater { get; }
    public string Description { get; }
 
    public SettingLocation Location { get; private set; }
 
    protected Setting(OptionKey2 optionKey, string description, OptionUpdater updater, SettingLocation location)
    {
        Key = optionKey;
        Description = description;
        Updater = updater;
        Location = location;
    }
 
    public abstract Type Type { get; }
    protected abstract object UpdateValue(object settingValue);
    public abstract object? GetValue();
 
    public void SetValue(object value)
    {
        Location = Location with { LocationKind = LocationKind.EditorConfig };
        Updater.QueueUpdate(Key.Option, UpdateValue(value));
    }
 
    public string Category => Key.Option.Definition.Group.Description;
    public bool IsDefinedInEditorConfig => Location.LocationKind != LocationKind.VisualStudio;
 
    public static Setting<TValue> Create<TValue>(
        Option2<TValue> option,
        string description,
        TieredAnalyzerConfigOptions options,
        OptionUpdater updater)
        where TValue : notnull
    {
        var optionKey = new OptionKey2(option);
        options.GetInitialLocationAndValue<TValue>(option, out var initialLocation, out var initialValue);
        return new Setting<TValue>(optionKey, description, updater, initialLocation, initialValue);
    }
 
    public static Setting<TValue> Create<TValue>(
        PerLanguageOption2<TValue> option,
        string description,
        TieredAnalyzerConfigOptions options,
        OptionUpdater updater)
        where TValue : notnull
    {
        // TODO: Support for other languages https://github.com/dotnet/roslyn/issues/65859
        var optionKey = new OptionKey2(option, LanguageNames.CSharp);
        options.GetInitialLocationAndValue<TValue>(option, out var initialLocation, out var initialValue);
        return new Setting<TValue>(optionKey, description, updater, initialLocation, initialValue);
    }
 
    public static EnumFlagsSetting<TValue> CreateEnumFlags<TValue>(
        Option2<TValue> option,
        int flag,
        string description,
        StrongBox<TValue> valueStorage,
        Conversions<TValue, int> conversions,
        TieredAnalyzerConfigOptions options,
        OptionUpdater updater)
        where TValue : struct, Enum
    {
        var optionKey = new OptionKey2(option);
        options.GetInitialLocationAndValue<TValue>(option, out var initialLocation, out var initialValue);
        valueStorage.Value = initialValue;
        return new EnumFlagsSetting<TValue>(optionKey, description, updater, initialLocation, flag, valueStorage, conversions);
    }
}