using System.Collections.Generic;
using UnityEngine;

namespace SK.Framework
{
    public class TaskManager
    {
        public static TaskManager Instance { get; } = new TaskManager();

        private readonly List<TaskData> _tasks = new List<TaskData>();
        private int _currentTaskIndex = -1;

        private TaskMode _mode = TaskMode.Teach;

        public TaskData CurrentTask =>
            (_currentTaskIndex >= 0 && _currentTaskIndex < _tasks.Count)
                ? _tasks[_currentTaskIndex]
                : null;

        public void AddTask(TaskData task)
        {
            _tasks.Add(task);
        }

        public void SetMode(TaskMode mode)
        {
            _mode = mode;
            Debug.Log($"[TaskManager] Mode = {_mode}");
        }

        public void Start()
        {
            if (_tasks.Count == 0)
                return;

            _currentTaskIndex = 0;
            StartCurrentTask();
        }

        private void StartCurrentTask()
        {
            if (_currentTaskIndex >= _tasks.Count)
            {
                Debug.Log("[TaskManager] 所有任务完成");
                return;
            }

            var task = _tasks[_currentTaskIndex];

            task.OnTaskCompleted += OnTaskCompleted;
            task.OnTaskFailed += OnTaskFailed;

            task.Start(_mode);
        }

        private void OnTaskCompleted(TaskData task)
        {
            task.OnTaskCompleted -= OnTaskCompleted;
            task.OnTaskFailed -= OnTaskFailed;

            _currentTaskIndex++;
            StartCurrentTask();
        }

        private void OnTaskFailed(TaskData task, string reason)
        {
            // 失败不自动跳任务，由上层系统处理
        }

        /// <summary>
        /// 预留方法
        /// </summary>
        public void Tick()
        {
            CurrentTask?.Tick();
        }

        /// <summary>
        /// 外部调用：汇报当前 Step 的结果
        /// </summary>
        public void ReportCurrentStepResult(bool isError)
        {
            CurrentTask?.CompleteCurrentStep(isError);
        }

      
        /// <summary>
        /// 通过stepID跳转步骤
        /// </summary>
        /// <param name="stepId"></param>
        public void JumpToStepById(int stepId)
        {
            CurrentTask?.JumpToStepById(stepId);
        }

        public void RestartCurrentTask()
        {
            if (CurrentTask == null)
                return;

            CurrentTask.Reset();
            CurrentTask.Start(_mode);
        }
        //跳步s
    }
}