using System.Collections;
using System.Collections.Generic;
using TcgEngine.Client;
using UnityEngine;

namespace TcgEngine.UI
{
    public class TaskPanel : UIPanel
    {
        public Transform taskListRoot;
        public GameObject taskItemPrefab;

        private Dictionary<string,TaskItem> taskItems = new Dictionary<string,TaskItem>();
        public Dictionary<string, TaskData> allTaskData;
        protected override void Awake()
        {
            base.Awake();
            allTaskData = new Dictionary<string, TaskData>();
            TaskData[] datas = Resources.LoadAll<TaskData>("Tasks"); // 假设你放在 Resources/Tasks 下
            foreach (var d in datas)
            {
                allTaskData[d.id] = d;
            }
        }
        
        protected override void Start()
        {
            base.Start();
            Show();
        }

        /// <summary>
        /// 初始化任务列表（只在第一次打开时用）
        /// </summary>
        public void ShowTasks(List<PlayerTask> playerTasks)
        {
            if (taskListRoot != null)
            {
                foreach (Transform child in taskListRoot)
                {
                    Destroy(child.gameObject);
                }
            }

            ClearTasks();

            foreach (var pTask in playerTasks)
            {
                GameObject gObj = Instantiate(taskItemPrefab, taskListRoot);
                TaskItem item = gObj.GetComponent<TaskItem>();
                taskItems[pTask.taskId] = item;

                TaskData data = LoadTaskDataById(pTask.taskId);
                if (data != null)
                {
                    item.SetTask(data, pTask);
                }
            }
        }

        public void RefreshTasks(List<PlayerTask> playerTasks)
        {
            HashSet<string> currentIds  = new HashSet<string>();
            foreach (var pTask  in playerTasks)
            {
                if (taskItems.ContainsKey(pTask.taskId))
                {
                    TaskItem item = taskItems[pTask.taskId];
                    TaskData data = LoadTaskDataById(pTask.taskId);
                    if (data != null)
                    {
                        item.SetTask(data, pTask);
                    }

                    currentIds .Remove(pTask.taskId);
                }
                else
                {
                    GameObject gObj = Instantiate(taskItemPrefab, taskListRoot);
                    TaskItem item = gObj.GetComponent<TaskItem>();
                    taskItems[pTask.taskId] = item;

                    TaskData data = LoadTaskDataById(pTask.taskId);
                    if (data != null)
                        item.SetTask(data, pTask);
                }

            }                
            // Step 2: 删除那些在 playerTasks 里不存在的旧任务
            foreach (var oldId in currentIds)
            {
                if (taskItems.TryGetValue(oldId, out TaskItem oldItem))
                {
                    Destroy(oldItem.gameObject);
                    taskItems.Remove(oldId);
                }
            }

        }

        public void ClearTasks()
        {
            foreach (var item in taskItems.Values)
            {
                Destroy(item.gameObject);
            }
            taskItems.Clear();
        }

        public override void AfterHide()
        {
            base.AfterHide();
            ClearTasks();
        }
        




        private TaskData LoadTaskDataById(string id)
        {
            if (allTaskData.TryGetValue(id, out TaskData data))
                return data;
            return null;
        }
    }
}