using System;
using Cysharp.Threading.Tasks;

namespace SLSUtilities.General
{
    /// <summary>
    /// 命令基类。子类重写 <see cref="ExecuteAsync"/> 实现具体逻辑。
    /// 框架通过 <see cref="RunAsync"/> 调用，先处理可选延迟再执行核心逻辑。
    /// </summary>
    public abstract class CommandBase
    {
        /// <summary>命令自身的私有上下文，可携带局部参数。</summary>
        public CommandContext selfContext;

        private float delayBeforeExecute;

        public CommandBase(CommandContext selfContext = null)
        {
            this.selfContext = selfContext ?? new CommandContext();
        }

        /// <summary>设置命令执行前的延迟秒数，返回自身支持链式调用。</summary>
        public CommandBase SetDelay(float seconds)
        {
            delayBeforeExecute = seconds;
            return this;
        }

        /// <summary>
        /// 框架调用入口：先执行可选延迟，再调用 <see cref="ExecuteAsync"/>。
        /// 子类不应重写此方法。
        /// </summary>
        public async UniTask RunAsync(CommandContext outerContext)
        {
            if (delayBeforeExecute > 0f)
                await UniTask.Delay(TimeSpan.FromSeconds(delayBeforeExecute));

            await ExecuteAsync(outerContext);
        }

        /// <summary>子类重写此方法以实现命令的核心逻辑。</summary>
        protected virtual async UniTask ExecuteAsync(CommandContext outerContext)
        {
            await UniTask.CompletedTask;
        }

        /// <summary>浅拷贝当前命令，selfContext 也会被拷贝一份新实例。</summary>
        public virtual CommandBase Clone()
        {
            CommandBase clone = (CommandBase)MemberwiseClone();
            clone.selfContext = selfContext.Clone();
            return clone;
        }
    }
}