using System;
using SoulliesFramework.General;
using UniRx;
using UnityEngine;
using UnityEngine.Events;

namespace Continentis.MainGame.Commands
{
    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;
        }

        protected override IObservable<Unit> OnExecute(CommandContext context)
        {
            if (functionDuration > 0)
            {
                if (executeAtStart) //在持续时间开始时执行
                {
                    function?.Invoke();
                    return Observable.Timer(TimeSpan.FromSeconds(functionDuration)).AsUnitObservable();
                }

                return Observable.Timer(TimeSpan.FromSeconds(functionDuration))
                    .Do(_ => function?.Invoke())
                    .AsUnitObservable(); //在持续时间结束时执行
            }

            function?.Invoke();
            return Observable.Return(Unit.Default); //如果持续时间为0，立即完成
        }
    }
}