package intimate

import (
	"database/sql"
	"errors"
	"log"
	"time"

	_ "github.com/go-sql-driver/mysql"
)

// IGetSource 源接口结构
type IGetSource interface {
	GetUid() int64               //
	GetUrl() string              //
	GetTargetType() string       //
	GetSource() sql.NullString   //
	GetExt() interface{}         //
	GetUpdateTime() time.Time    //
	GetOperator() int32          //
	GetErrorMsg() sql.NullString //
}

type IUpdateSource interface {
	IGetSource

	SetExt(ext interface{})          //
	SetUpdateTime(ut time.Time)      //
	SetOperator(operator int32)      //
	SetErrorMsg(emsg sql.NullString) //
}

// OperatorFlag 标志
type OperatorFlag int32

const (
	// OperatorOK 等待被处理
	OperatorOK OperatorFlag = 100
	// OperatorWait 等待被处理
	OperatorWait OperatorFlag = 1000
	// OperatorError 错误标志
	OperatorError OperatorFlag = 10000
)

// Store 储存
type Store struct {
	table      string
	db         *sql.DB
	errorCount int
	errorLimit int
}

// NewStore 创建一个存储实例
func NewStore(table string) *Store {
	db, err := sql.Open("mysql", InitConfig.Database.URI)
	if err != nil {
		panic(err)
	}
	return &Store{table: table, db: db}
}

func (store *Store) errorAlarm(err error) {
	if err != nil {
		log.Println("store error: ", err)
		// 报警. 如果数据插入有问题
		store.errorCount++
		if store.errorCount >= store.errorLimit {
			// 数据库频繁操作初问题 报警, 减少没意义的请求
		}
	} else {
		if store.errorCount > 0 {
			store.errorCount--
		}
	}
}

// Insert 储存数据
func (store *Store) Insert(isource IGetSource) {
	_, err := store.db.Exec("insert into `source_openrec`(url, target_type, source,  ext, operator, error_msg) values(?,?,?,?,?,?)", isource.GetUrl(), isource.GetTargetType(), isource.GetSource(), isource.GetExt(), isource.GetOperator(), isource.GetErrorMsg())
	store.errorAlarm(err)
}

// Update 储存数据
func (store *Store) Update(isource IUpdateSource) {
	_, err := store.db.Exec("update "+store.table+" set  ext = ?, operator = ?, error_msg = ? where uid = ?", isource.GetExt(), isource.GetOperator(), isource.GetErrorMsg(), isource.GetUid())
	store.errorAlarm(err)
}

// Pop 储存数据
func (store *Store) Pop(targetType string, operators ...int32) (IUpdateSource, error) {

	tx, err := store.db.Begin()
	if err != nil {
		log.Println(err, targetType)
		return nil, err
	}
	var args = []interface{}{targetType}
	selectSQL := `select uid, url, target_type, source, ext, operator from ` + store.table + ` where target_type = ?`
	if len(operators) == 0 {
		selectSQL += " and operator = ?"
		args = append(args, 0)
	} else {
		for _, operator := range operators {
			selectSQL += " and operator = ?"
			args = append(args, operator)
		}
	}

	// log.Println(selectSQL + ` limit 1 for update`)
	row := tx.QueryRow(selectSQL+` limit 1 for update`, args...)

	defer func() {
		err := tx.Commit()
		if err != nil {
			log.Println(err)
			err = tx.Rollback()
			if err != nil {
				log.Println(err)
			}
		}
	}()

	if row != nil {
		s := &Source{}
		// uid, url, target_type, source, ext, operator
		err = row.Scan(&s.Uid, &s.Url, &s.TargetType, &s.Source, &s.Ext, &s.Operator)
		if err != nil {
			log.Println(err, targetType)
			_, err = tx.Exec("update "+store.table+" set error_msg = ?, operator = ? where uid = ?", OperatorError, s.Uid)
			if err != nil {
				log.Println(err)
			}
			return nil, err
		}
		_, err = tx.Exec("update "+store.table+" set operator = ? where uid = ?", OperatorWait, s.Uid)
		return s, nil
	}

	return nil, errors.New("TaskQueue is nil")
}