package db

import (
	. "code.hoteas.com/golang/hotime/common"
	"database/sql"
	"encoding/json"
	"errors"
	"reflect"
	"strings"
)

// md5 生成查询的 MD5 哈希（用于缓存）
func (that *HoTimeDB) md5(query string, args ...interface{}) string {
	strByte, _ := json.Marshal(args)
	str := Md5(query + ":" + string(strByte))
	return str
}

// Query 执行查询 SQL
func (that *HoTimeDB) Query(query string, args ...interface{}) []Map {
	return that.queryWithRetry(query, false, args...)
}

// queryWithRetry 内部查询方法，支持重试标记
func (that *HoTimeDB) queryWithRetry(query string, retried bool, args ...interface{}) []Map {
	// 保存调试信息（加锁保护）
	that.mu.Lock()
	that.LastQuery = query
	that.LastData = args
	that.mu.Unlock()

	defer func() {
		if that.Mode != 0 {
			that.mu.RLock()
			that.Log.Info("SQL:"+that.LastQuery, " DATA:", that.LastData, " ERROR:", that.LastErr.GetError())
			that.mu.RUnlock()
		}
	}()

	var err error
	var resl *sql.Rows

	// 主从数据库切换，只有select语句有从数据库
	db := that.DB
	if that.SlaveDB != nil {
		db = that.SlaveDB
	}

	if db == nil {
		err = errors.New("没有初始化数据库")
		that.LastErr.SetError(err)
		return nil
	}

	// 处理参数中的 slice 类型
	processedArgs := that.processArgs(args)

	if that.Tx != nil {
		resl, err = that.Tx.Query(query, processedArgs...)
	} else {
		resl, err = db.Query(query, processedArgs...)
	}

	that.LastErr.SetError(err)
	if err != nil {
		// 如果还没重试过，尝试 Ping 后重试一次
		if !retried {
			if pingErr := db.Ping(); pingErr == nil {
				return that.queryWithRetry(query, true, args...)
			}
		}
		return nil
	}

	return that.Row(resl)
}

// Exec 执行非查询 SQL
func (that *HoTimeDB) Exec(query string, args ...interface{}) (sql.Result, *Error) {
	return that.execWithRetry(query, false, args...)
}

// execWithRetry 内部执行方法，支持重试标记
func (that *HoTimeDB) execWithRetry(query string, retried bool, args ...interface{}) (sql.Result, *Error) {
	// 保存调试信息（加锁保护）
	that.mu.Lock()
	that.LastQuery = query
	that.LastData = args
	that.mu.Unlock()

	defer func() {
		if that.Mode != 0 {
			that.mu.RLock()
			that.Log.Info("SQL: "+that.LastQuery, " DATA: ", that.LastData, " ERROR: ", that.LastErr.GetError())
			that.mu.RUnlock()
		}
	}()

	var e error
	var resl sql.Result

	if that.DB == nil {
		err := errors.New("没有初始化数据库")
		that.LastErr.SetError(err)
		return nil, that.LastErr
	}

	// 处理参数中的 slice 类型
	processedArgs := that.processArgs(args)

	if that.Tx != nil {
		resl, e = that.Tx.Exec(query, processedArgs...)
	} else {
		resl, e = that.DB.Exec(query, processedArgs...)
	}

	that.LastErr.SetError(e)
	// 判断是否连接断开了，如果还没重试过，尝试重试一次
	if e != nil {
		if !retried {
			if pingErr := that.DB.Ping(); pingErr == nil {
				return that.execWithRetry(query, true, args...)
			}
		}
		return resl, that.LastErr
	}

	return resl, that.LastErr
}

// processArgs 处理参数中的 slice 类型
func (that *HoTimeDB) processArgs(args []interface{}) []interface{} {
	processedArgs := make([]interface{}, len(args))
	copy(processedArgs, args)
	for key := range processedArgs {
		arg := processedArgs[key]
		if arg == nil {
			continue
		}
		argType := reflect.ValueOf(arg).Type().String()
		if strings.Contains(argType, "[]") || strings.Contains(argType, "Slice") {
			argLis := ObjToSlice(arg)
			// 将slice转为逗号分割字符串
			argStr := ""
			for i := 0; i < len(argLis); i++ {
				if i == len(argLis)-1 {
					argStr += ObjToStr(argLis[i])
				} else {
					argStr += ObjToStr(argLis[i]) + ","
				}
			}
			processedArgs[key] = argStr
		}
	}
	return processedArgs
}

// Row 数据库数据解析
func (that *HoTimeDB) Row(resl *sql.Rows) []Map {
	dest := make([]Map, 0)
	strs, _ := resl.Columns()

	for i := 0; resl.Next(); i++ {
		lis := make(Map, 0)
		a := make([]interface{}, len(strs))

		b := make([]interface{}, len(a))
		for j := 0; j < len(a); j++ {
			b[j] = &a[j]
		}
		err := resl.Scan(b...)
		if err != nil {
			that.LastErr.SetError(err)
			return nil
		}
		for j := 0; j < len(a); j++ {
			if a[j] != nil && reflect.ValueOf(a[j]).Type().String() == "[]uint8" {
				lis[strs[j]] = string(a[j].([]byte))
			} else {
				lis[strs[j]] = a[j] // 取实际类型
			}
		}

		dest = append(dest, lis)
	}

	return dest
}