package sqlAsyncMgr

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
	"time"

	"github.com/jinzhu/gorm"
	_ "github.com/jinzhu/gorm/dialects/mysql"
	"goutil/logUtil"
	"goutil/stringUtil"
)

// sql异步util类
type SqlAsyncUtil struct {
	// 文件路径
	filePath string

	// 名称
	name string

	// 工作者最大数量
	max_Worker_Nums int32

	// 工作池
	workerPool *SqlAsyncWorkerPool

	// 缓存统计
	sqlStatistics *SqlAsyncIdentityStatistics

	// 日志处理方法
	logAction func(logUtil.LogType, string)

	// db驱动
	db *gorm.DB
}

//  NewSqlAsyncUtil 创建新SqlAsyncUtil对象
func NewSqlAsyncUtil(_name, _filePath string, maxWorker int32, dbConnectionStr string, _logAction func(logUtil.LogType, string)) *SqlAsyncUtil {
	if stringUtil.IsEmpty(_name) || stringUtil.IsEmpty(_filePath) || stringUtil.IsEmpty(dbConnectionStr) {
		panic(fmt.Sprintf("NewSqlAsyncUtil方法_name/_filePath/dbConnectionStr参数不能为空"))
	}
	if maxWorker <= 0 {
		panic(fmt.Sprintf("NewSqlAsyncUtil方法maxWorker参数必须>0"))
	}
	if _logAction == nil {
		panic(fmt.Sprintf("NewSqlAsyncUtil方法_logAction参数并能为nil"))
	}

	result := &SqlAsyncUtil{
		name:            _name,
		filePath:        _filePath,
		max_Worker_Nums: maxWorker,
		logAction:       _logAction,
	}
	result.db = newGormDb(dbConnectionStr, maxWorker)
	result.workerPool = newSqlAsyncWorkerPool(maxWorker, result.reduceStatistics, _logAction, func() string { return result.name }, result.db)
	result.sqlStatistics = newSqlAsyncIdentityStatistics()

	return result
}

//  NewSqlAsyncUtil2 创建新SqlAsyncUtil对象
func NewSqlAsyncUtil2(_name, _filePath string, maxWorker int32, db *gorm.DB, _logAction func(logUtil.LogType, string)) *SqlAsyncUtil {
	if stringUtil.IsEmpty(_name) || stringUtil.IsEmpty(_filePath) || db == nil {
		panic(fmt.Sprintf("NewSqlAsyncUtil方法_name/_filePath/db参数不能为空"))
	}
	if maxWorker <= 0 {
		panic(fmt.Sprintf("NewSqlAsyncUtil方法maxWorker参数必须>0"))
	}
	if _logAction == nil {
		panic(fmt.Sprintf("NewSqlAsyncUtil方法_logAction参数并能为nil"))
	}

	result := &SqlAsyncUtil{
		name:            _name,
		filePath:        _filePath,
		max_Worker_Nums: maxWorker,
		logAction:       _logAction,
	}
	result.db = db
	result.workerPool = newSqlAsyncWorkerPool(maxWorker, result.reduceStatistics, _logAction, func() string { return result.name }, result.db)
	result.sqlStatistics = newSqlAsyncIdentityStatistics()

	return result
}

// Start 启动
func (this *SqlAsyncUtil) Start() {
	// 启动工作线程
	this.workerPool.Start()

	// 读取待同步sql
	waitSyncSqls := this.readWaitSql()
	if waitSyncSqls == nil {
		return
	}

	// 将数据加入写入队列
	for _, item := range waitSyncSqls {
		if item == nil {
			continue
		}
		this.Write(item)
	}
}

// Stop 停止
func (this *SqlAsyncUtil) Stop(save bool) {
	saveList := this.workerPool.Stop()
	if saveList == nil || len(saveList) == 0 {
		return
	}

	if save == false {
		return
	}

	this.waitSqlFlushFile(saveList)
}

// WaitSqlSyncDone 等待剩余sql同步完成
func (this *SqlAsyncUtil) WaitSqlSyncDone() {
	for {
		num := this.GetAllCount()
		this.logAction(logUtil.Debug, fmt.Sprintf("SqlAsyncUtil(%s)当前剩余sql数量为:%v", this.name, num))

		if num > 0 {
			time.Sleep(time.Millisecond * 100)
			continue
		}

		// 删除文件
		this.delFile()
		return
	}
}

// Write1 写入Sql
func (this *SqlAsyncUtil) Write1(tableName, identityId, sql string) {
	newItem := newSqlAsyncItemModel(tableName, identityId, sql)
	this.Write(newItem)
}

// Write 写入Sql
func (this *SqlAsyncUtil) Write(item *SqlAsyncItemModel) {
	worker, err := this.workerPool.GetWork(item.TableName)
	if err != nil {
		this.logAction(logUtil.Error, err.Error())
		return
	}

	worker.Add(item)
	this.sqlStatistics.AddCount(item.IdentityId, 1)
}

// GetCount 获取指定标识的待执行sql
func (this *SqlAsyncUtil) GetCount(identityId string) int32 {
	return this.sqlStatistics.GetCount(identityId)
}

// GetAllCount 获取总的待执行sql
func (this *SqlAsyncUtil) GetAllCount() int32 {
	return this.workerPool.GetWaitSyncCount()
}

// ReduceStatistics 减少统计
func (this *SqlAsyncUtil) reduceStatistics(item *SqlAsyncItemModel) {
	this.sqlStatistics.Reduce(item.IdentityId, 1)
}

// readWaitSql 读取待同步sql
func (this *SqlAsyncUtil) readWaitSql() []*SqlAsyncItemModel {
	_, err := os.Stat(this.filePath)
	if err != nil {
		return nil
	}

	var bytes []byte
	bytes, err = ioutil.ReadFile(this.filePath)
	if err != nil {
		panic(fmt.Sprintf("readWaitSql错误 file:%s err:%s", this.filePath, err.Error()))
	}

	result := make([]*SqlAsyncItemModel, 0)
	err = json.Unmarshal(bytes, &result)
	if err != nil {
		panic(fmt.Sprintf("readWaitSql json反序列化错误 file:%s err:%s", this.filePath, err.Error()))
	}

	return result
}

// waitSqlFlushFile 待同步sql写入文件
func (this *SqlAsyncUtil) waitSqlFlushFile(waitSqlList []*SqlAsyncItemModel) {
	dir := filepath.Dir(this.filePath)

	// 创建文件夹
	_, err := os.Stat(dir)
	if err != nil {
		os.MkdirAll(dir, os.ModePerm)
	}

	data, err := json.Marshal(waitSqlList)
	if err != nil {
		this.logAction(logUtil.Error, fmt.Sprintf("SqlAsyncUtil保存sql时,json出错,name:%s err:%s", this.name, err.Error()))
		return
	}

	err = ioutil.WriteFile(this.filePath, data, os.ModePerm)
	if err != nil {
		this.logAction(logUtil.Error, fmt.Sprintf("SqlAsyncUtil保存sql时,写入出错,name:%s err:%s", this.name, err.Error()))
	}
}

// delFile 删除文件
func (this *SqlAsyncUtil) delFile() {
	// 创建文件夹
	_, err := os.Stat(this.filePath)
	if err == nil {
		os.Remove(this.filePath)
	}
}

// @title newGormDb
// @description 构造新gorm.DB对象
// @Param connectionString 数据库连接字符串
// @Param maxOpenCount 最大打开连接数
func newGormDb(connectionString string, maxOpenCount int32) *gorm.DB {
	dbObj, err := gorm.Open("mysql", connectionString)
	if err != nil {
		panic(fmt.Sprintf("连接mysql出错 connectionString:%s  err:%s", connectionString, err))
	}

	dbObj.DB().SetMaxOpenConns(int(maxOpenCount))
	dbObj.DB().SetMaxIdleConns(int(maxOpenCount))
	dbObj.DB().SetConnMaxLifetime(time.Minute * 4)

	return dbObj
}