// Package mysql ...
//
// Description : mysql客户端
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2021-03-01 9:20 下午
package mysql

import (
	"fmt"

	"git.zhangdeman.cn/zhangdeman/logger/wrapper"
	"github.com/gin-gonic/gin"

	"go.uber.org/zap"

	"git.zhangdeman.cn/zhangdeman/logger"
	gormLogger "gorm.io/gorm/logger"

	"gorm.io/driver/mysql"
	"gorm.io/gorm"
)

// NewDBClient ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 3:09 PM 2021/12/24
func NewDBClient(masterConf *DBConfig, slaveConf *DBConfig, logConf *LogConfig, loggerInstance *zap.Logger, extraRequestFieldList []string) (*DBClient, error) {
	client := &DBClient{
		extraFieldList: extraRequestFieldList,
	}
	var err error
	// 日志初始化失败
	if client.loggerInstance, err = getLogInstance(logConf, loggerInstance); nil != err {
		return nil, err
	}
	if client.master, err = GetDatabaseClient(masterConf, nil); nil != err {
		return nil, err
	}
	if client.slave, err = GetDatabaseClient(slaveConf, nil); nil != err {
		return nil, err
	}
	return client, nil
}

// DBClient 包装日志实例
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 3:09 PM 2021/12/24
type DBClient struct {
	loggerInstance *zap.Logger
	master         *gorm.DB
	slave          *gorm.DB
	extraFieldList []string
}

// GetMaster 获取主库连接
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 3:28 PM 2021/12/24
func (dc *DBClient) GetMaster(ctx *gin.Context) *gorm.DB {
	session := dc.master.Session(&gorm.Session{})
	session.Logger = dc.getLogger(ctx, session, "slave")
	return session
}

// GetSlave 获取从库链接
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 3:29 PM 2021/12/24
func (dc *DBClient) GetSlave(ctx *gin.Context) *gorm.DB {
	session := dc.slave.Session(&gorm.Session{})
	session.Logger = dc.getLogger(ctx, session, "slave")
	return session
}

// getLogger 获取日志实例
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 3:45 PM 2021/12/24
func (dc *DBClient) getLogger(ctx *gin.Context, dbClient *gorm.DB, node string) gormLogger.Interface {
	return wrapper.NewGormLoggerWithInstance(ctx, dbClient, dc.loggerInstance, node, dc.extraFieldList)
}

// getLogInstance 获取日志实例
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 3:20 PM 2021/12/24
func getLogInstance(logConf *LogConfig, loggerInstance *zap.Logger) (*zap.Logger, error) {
	if nil != loggerInstance {
		return loggerInstance, nil
	}
	logConfList := []logger.SetLoggerOptionFunc{logger.WithEncoder(logConf.Encoder), logger.WithCallerSkip(logConf.Skip), logger.WithCaller()}
	if logConf.ConsoleOutput {
		logConfList = append(logConfList, logger.WithConsoleOutput())
	}

	var (
		err error
	)
	if loggerInstance, err = logger.NewLogger(logConf.Level, logConf.SplitConfig, logConfList...); nil != err {
		return nil, err
	}
	return loggerInstance, nil
}

// GetDatabaseClient 获取日志实例
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 10:49 下午 2021/3/1
func GetDatabaseClient(conf *DBConfig, logConf *LogConfig) (*gorm.DB, error) {
	var (
		instance       *gorm.DB
		err            error
		loggerInstance *zap.Logger
	)

	if instance, err = gorm.Open(mysql.Open(buildConnectionDSN(conf)), &gorm.Config{}); nil != err {
		return nil, err
	}

	if nil != logConf {
		if loggerInstance, err = getLogInstance(logConf, nil); nil != err {
			return nil, err
		}
		instance.Logger = wrapper.NewGormLoggerWithInstance(nil, instance, loggerInstance, "", nil)
	}

	return instance, nil
}

// buildConnectionDSN 构建建立连接的DSN
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 9:34 下午 2021/3/1
func buildConnectionDSN(conf *DBConfig) string {
	return fmt.Sprintf(
		"%s:%s@tcp(%s:%d)/%s?charset=%s&parseTime=True&loc=Local",
		conf.Username,
		conf.Password,
		conf.Host,
		conf.Port,
		conf.Database,
		conf.Charset,
	)
}