#nullable enable
using System;
using System.Collections.Generic;
using Cysharp.Threading.Tasks;
using ShrinkApp;
using ShrinkContext;
using ShrinkCommand;

namespace ShrinkCommand.Integration.App
{
    /// <summary>
    /// ShrinkCommand 的原生 Cordis 组件（阶段 3）：
    /// 提供 <c>shrink.service.command</c> 余效应键（默认命令服务），依赖者按键注入；
    /// 与经典 ShrinkCommandAppInstaller（ModuleId "shrink.command"）二选一使用（同键供给冲突保护）。
    /// </summary>
    public sealed class ShrinkCommandAppComponent : IShrinkComponent
    {
        public const string ServiceKey = "shrink.service.command";
        public const string ModuleKey = "app.module.shrink.command";

        private static readonly string[] ProvideKeys = { ModuleKey, ServiceKey };

        public string Name => "shrink.command";

        public IReadOnlyList<string> Inject => Array.Empty<string>();

        public IReadOnlyList<string> Provide => ProvideKeys;

        public UniTask ApplyAsync(ShrinkCtx ctx, object? config)
        {
            var service = ShrinkCommandRuntime.Default;
            ctx.Set(ServiceKey, service);
            ctx.Set(ModuleKey, Name);

            if (config is ShrinkAppServices appServices)
            {
                var facade = new ShrinkCommandAppService(service);
                appServices.Register(facade);
                ctx.EffectInverse(() =>
                {
                    appServices.TryUnregister(facade);
                    return UniTask.CompletedTask;
                });
            }

            return UniTask.CompletedTask;
        }
    }
}