package syncdrive

import (
	"encoding/json"
	"fmt"
	"github.com/tickstep/aliyunpan-api/aliyunpan"
	"github.com/tickstep/aliyunpan/internal/config"
	"github.com/tickstep/aliyunpan/internal/utils"
	"github.com/tickstep/library-go/logger"
	"io/ioutil"
	"path"
	"time"
)

type (
	// SyncTaskManager 同步任务管理器
	SyncTaskManager struct {
		syncDriveConfig *SyncDriveConfig

		fileDownloadParallel  int
		fileUploadParallel    int
		fileDownloadBlockSize int64
		fileUploadBlockSize   int64
		useInternalUrl        bool

		maxDownloadRate int64 // 限制最大下载速度
		maxUploadRate   int64 // 限制最大上传速度

		PanUser              *config.PanUser
		DriveId              string
		PanClient            *aliyunpan.PanClient
		SyncConfigFolderPath string

		// useConfigFile 是否使用配置文件启动
		useConfigFile bool
	}

	// SyncDriveConfig 同步盘配置文件
	SyncDriveConfig struct {
		ConfigVer    string      `json:"configVer"`
		SyncTaskList []*SyncTask `json:"syncTaskList"`
	}
)

var (
	ErrSyncTaskListEmpty error = fmt.Errorf("no sync task")
)

func NewSyncTaskManager(user *config.PanUser, driveId string, panClient *aliyunpan.PanClient, syncConfigFolderPath string,
	fileDownloadParallel, fileUploadParallel int, fileDownloadBlockSize, fileUploadBlockSize int64, useInternalUrl bool,
	maxDownloadRate, maxUploadRate int64) *SyncTaskManager {
	return &SyncTaskManager{
		PanUser:              user,
		DriveId:              driveId,
		PanClient:            panClient,
		SyncConfigFolderPath: syncConfigFolderPath,

		fileDownloadParallel:  fileDownloadParallel,
		fileUploadParallel:    fileUploadParallel,
		fileDownloadBlockSize: fileDownloadBlockSize,
		fileUploadBlockSize:   fileUploadBlockSize,
		useInternalUrl:        useInternalUrl,

		maxDownloadRate: maxDownloadRate,
		maxUploadRate:   maxUploadRate,
	}
}

func (m *SyncTaskManager) parseConfigFile() error {
	/** 样例
	{
	 "configVer": "1.0",
	 "syncTaskList": [
	  {
	   "name": "NS游戏备份",
	   "id": "5b2d7c10-e927-4e72-8f9d-5abb3bb04814",
	   "driveId": "19519111",
	   "localFolderPath": "D:\\smb\\datadisk\\game",
	   "panFolderPath": "/sync_drive/game",
	   "mode": "sync",
	   "lastSyncTime": ""
	  }
	 ]
	}
	*/
	configFilePath := m.ConfigFilePath()
	r := &SyncDriveConfig{
		ConfigVer:    "1.0",
		SyncTaskList: []*SyncTask{},
	}
	m.syncDriveConfig = r

	if b, _ := utils.PathExists(configFilePath); b != true {
		//text := utils.ObjectToJsonStr(r, true)
		//ioutil.WriteFile(ConfigFilePath, []byte(text), 0755)
		return fmt.Errorf("备份配置文件不存在：" + m.ConfigFilePath())
	}
	data, e := ioutil.ReadFile(configFilePath)
	if e != nil {
		return e
	}

	if len(data) > 0 {
		if err2 := json.Unmarshal(data, m.syncDriveConfig); err2 != nil {
			logger.Verboseln("parse sync drive config json error ", err2)
			return err2
		}
	}
	return nil
}

func (m *SyncTaskManager) ConfigFilePath() string {
	return path.Join(m.SyncConfigFolderPath, "sync_drive_config.json")
}

// Start 启动同步进程
func (m *SyncTaskManager) Start(tasks []*SyncTask) (bool, error) {
	if tasks != nil && len(tasks) > 0 {
		m.syncDriveConfig = &SyncDriveConfig{
			ConfigVer:    "1.0",
			SyncTaskList: []*SyncTask{},
		}
		m.syncDriveConfig.SyncTaskList = tasks
		m.useConfigFile = false
	} else {
		if er := m.parseConfigFile(); er != nil {
			return false, er
		}
		m.useConfigFile = true
	}
	if m.syncDriveConfig.SyncTaskList == nil || len(m.syncDriveConfig.SyncTaskList) == 0 {
		return false, ErrSyncTaskListEmpty
	}

	// start the sync task one by one
	for _, task := range m.syncDriveConfig.SyncTaskList {
		if len(task.Id) == 0 {
			task.Id = utils.UuidStr()
		}
		task.panUser = m.PanUser
		task.DriveId = m.DriveId
		task.syncDbFolderPath = m.SyncConfigFolderPath
		task.panClient = m.PanClient
		task.fileUploadParallel = m.fileUploadParallel
		task.fileDownloadParallel = m.fileDownloadParallel
		task.fileUploadBlockSize = m.fileUploadBlockSize
		task.fileDownloadBlockSize = m.fileDownloadBlockSize
		task.useInternalUrl = m.useInternalUrl
		task.maxDownloadRate = m.maxDownloadRate
		task.maxUploadRate = m.maxUploadRate
		if e := task.Start(); e != nil {
			logger.Verboseln(e)
			fmt.Println("start sync task error: {}", task.Id)
			continue
		}
		fmt.Println("\n启动同步任务")
		fmt.Println(task)
		time.Sleep(200 * time.Millisecond)
	}
	// save config file
	if m.useConfigFile {
		ioutil.WriteFile(m.ConfigFilePath(), []byte(utils.ObjectToJsonStr(m.syncDriveConfig, true)), 0755)
	}
	return true, nil
}

// Stop 停止同步进程
func (m *SyncTaskManager) Stop() (bool, error) {
	// stop task one by one
	for _, task := range m.syncDriveConfig.SyncTaskList {
		if e := task.Stop(); e != nil {
			logger.Verboseln(e)
			fmt.Println("stop sync task error: ", task.NameLabel())
			continue
		}
		fmt.Println("停止同步任务: ", task.NameLabel())
	}

	// save config file
	if m.useConfigFile {
		ioutil.WriteFile(m.ConfigFilePath(), []byte(utils.ObjectToJsonStr(m.syncDriveConfig, true)), 0755)
	}
	return true, nil
}