using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace TModule.Runtime
{
    public class DownloadManager : MonoBehaviour
    {
        private List<DownloadRoutine> _downloadRoutines = new List<DownloadRoutine>();

        private Queue<DownloadFileInfo> downloadFiles = new Queue<DownloadFileInfo>();

        /// <summary>
        /// 最大下载器数量
        /// </summary>
        public int m_maxCount = 5;

        private void Awake()
        {
            for (int i = 0; i < m_maxCount; i++)
            {
                _downloadRoutines.Add(new DownloadRoutine());
            }
        }

        /// <summary>
        /// 暂停下载
        /// </summary>
        /// <param name="url"></param>
        /// <param name="savePath"></param>
        public void StopDownload(string url, string savePath)
        {
            _downloadRoutines.Find(p => p.DownLoadUrl == url && p.FileSavePath == savePath)?.StopDownload();
        }

        /// <summary>
        /// 暂停下载
        /// </summary>
        /// <param name="fileInfo"></param>
        public void StopDownload(DownloadFileInfo fileInfo)
        {
            StopDownload(fileInfo.m_url, fileInfo.m_savePath);
        }

        /// <summary>
        /// 暂停所有下载
        /// </summary>
        public void StopAllDownload()
        {
            foreach (var item in _downloadRoutines)
            {
                if (!item.IsLeisure)
                    item.StopDownload();
            }
        }

        /// <summary>
        /// 开始下载
        /// </summary>
        /// <param name="url"></param>
        /// <param name="savePath"></param>
        /// <param name="onProgress"></param>
        /// <param name="onOver"></param>
        /// <param name="onError"></param>
        public void StartDownload(string url,string savePath,Action<float,long,long>onProgress=null,Action onOver=null,Action<string> onError=null)
        {
            StartDownload(new DownloadFileInfo
            {
                m_savePath = savePath,
                m_url = url,
                onErroe = onError,
                onOver = onOver,
                onProgress = onProgress
            });
        }

        /// <summary>
        /// 开始下载
        /// </summary>
        /// <param name="fileInfo"></param>
        public void StartDownload(DownloadFileInfo fileInfo)
        {
            DownloadRoutine routine = GetLeisureDownloadRoutine(); 
            if (routine == null)
                downloadFiles.Enqueue(fileInfo);
            else
            {
                routine.onProgress = fileInfo.onProgress;
                routine.onDownloadOver = ()=> { fileInfo.onOver?.Invoke(); CheckIsOver();};
                routine.onError = fileInfo.onErroe;
                routine.StartDownload(fileInfo.m_url, fileInfo.m_savePath);
            }
        }

        /// <summary>
        /// 批量下载
        /// </summary>
        /// <param name="fileInfos"></param>
        public void BatchDownload(IEnumerable<DownloadFileInfo> fileInfos)
        {
            foreach (var item in fileInfos)
            {
                StartDownload(item);
            }
        }

        /// <summary>
        /// 继续下载
        /// </summary>
        /// <param name="url"></param>
        /// <param name="savePath"></param>
        public void ContinueDownload(string url,string savePath)
        {
            _downloadRoutines.Find(p => p.DownLoadUrl == url && p.FileSavePath == savePath)?.ContinueDownload();
        }

        /// <summary>
        /// 继续下载
        /// </summary>
        /// <param name="fileInfo"></param>
        public void ContinueDownload(DownloadFileInfo fileInfo)
        {
            ContinueDownload(fileInfo.m_url, fileInfo.m_savePath);
        }

        /// <summary>
        /// 全部继续下载
        /// </summary>
        public void ContinueAllDownload()
        {
            foreach (var item in _downloadRoutines)
            {
                if (!item.IsLeisure && item.IsStop)
                    item.ContinueDownload();
            }
        }

        private void CheckIsOver()
        {
            lock(downloadFiles)
            {
                if (downloadFiles.Count > 0)
                {
                    StartDownload(downloadFiles.Dequeue());
                }
            }
        }

        /// <summary>
        /// 获取空闲下载器
        /// </summary>
        /// <returns></returns>
        private DownloadRoutine GetLeisureDownloadRoutine()
        {
            return _downloadRoutines.Find(p => p.IsLeisure);
        }
    }
}