using System;
using Cysharp.Threading.Tasks;
using SLSUtilities.General;
using UnityEngine;
using UnityEngine.Events;

namespace Continentis.MainGame.Commands
{
    /// <summary>
    /// 同步/延迟函数命令。新代码请改用 <see cref="Cmd.Do"/> / <see cref="Cmd.Wait"/> / <see cref="Cmd.After"/>。
    /// </summary>
    [Obsolete("请改用 Cmd.Do() / Cmd.Wait() / Cmd.After()。")]
    public class Cmd_Function : CommandBase
    {
        private readonly float functionDuration;
        private readonly UnityAction function;
        private readonly bool executeAtStart;

        public Cmd_Function(float functionDuration, UnityAction function, bool executeAtStart = true)
        {
            this.functionDuration = functionDuration;
            this.function = function;
            this.executeAtStart = executeAtStart;
        }

        public Cmd_Function(UnityAction function)
        {
            this.functionDuration = 0f;
            this.function = function;
            this.executeAtStart = true;
        }

        protected override async UniTask ExecuteAsync(CommandContext outerContext)
        {
            if (functionDuration > 0f)
            {
                if (executeAtStart)
                {
                    function?.Invoke();
                    await UniTask.Delay(TimeSpan.FromSeconds(functionDuration));
                }
                else
                {
                    await UniTask.Delay(TimeSpan.FromSeconds(functionDuration));
                    function?.Invoke();
                }
            }
            else
            {
                function?.Invoke();
            }
        }
    }

    /// <summary>
    /// 带参数的函数命令，参数由 selfContext 中的 "Target" 注入。
    /// 新代码请改用闭包捕获参数，通过 <see cref="Cmd.Do"/> 执行。
    /// </summary>
    [Obsolete("请改用闭包捕获参数并通过 Cmd.Do() 执行。")]
    public class Cmd_ParamFunction<T> : CommandBase where T : class
    {
        private readonly float functionDuration;
        private readonly UnityAction<T> function;
        private readonly bool executeAtStart;

        public Cmd_ParamFunction(UnityAction<T> function, CommandContext selfContext = null, bool executeAtStart = true)
            : base(selfContext)
        {
            this.functionDuration = 0f;
            this.function = function;
            this.executeAtStart = executeAtStart;
        }

        public Cmd_ParamFunction(float functionDuration, UnityAction<T> function, CommandContext selfContext = null, bool executeAtStart = true)
            : base(selfContext)
        {
            this.functionDuration = functionDuration;
            this.function = function;
            this.executeAtStart = executeAtStart;
        }

        protected override async UniTask ExecuteAsync(CommandContext outerContext)
        {
            if (!selfContext.TryGet<T>(CommandContextKeys.Target, out T param))
            {
                Debug.LogWarning($"Cmd_ParamFunction<{typeof(T).Name}> 未能从 selfContext 中获取 Target 参数。");
            }

            if (functionDuration > 0f)
            {
                if (executeAtStart)
                {
                    function?.Invoke(param);
                    await UniTask.Delay(TimeSpan.FromSeconds(functionDuration));
                }
                else
                {
                    await UniTask.Delay(TimeSpan.FromSeconds(functionDuration));
                    function?.Invoke(param);
                }
            }
            else
            {
                function?.Invoke(param);
            }
        }
    }
}