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

import (
	"context"
	"errors"
	"fmt"
	"git.zhangdeman.cn/zhangdeman/consts"
	"git.zhangdeman.cn/zhangdeman/database/define"
	"git.zhangdeman.cn/zhangdeman/serialize"
	"path/filepath"
	"strings"
	"sync"

	"git.zhangdeman.cn/zhangdeman/logger/wrapper"
	"go.uber.org/zap"

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

var (
	// Client mysql客户端
	Client *client
)

func init() {
	Client = &client{
		lock:        &sync.RWMutex{},
		clientTable: make(map[string]*define.DBClient),
	}
}

type client struct {
	lock        *sync.RWMutex
	clientTable map[string]*define.DBClient
	logger      *zap.Logger
}

// AddWithConfigFile 使用文件生成新的客户端，文件名去掉后缀作为flag
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 19:19 2022/6/5
func (c *client) AddWithConfigFile(cfgFilePath string, logInstance *zap.Logger, extraFieldList []string) error {
	var (
		err error
		cfg *define.CfgFile
	)

	if cfg, err = c.getCfg(cfgFilePath); nil != err {
		return err
	}
	if nil == cfg {
		// 不支持的配置文件格式
		return nil
	}
	return c.AddWithConfig(cfg.Flag, logInstance, cfg.Config, extraFieldList)
}

// AddWithConfig ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 20:41 2023/4/18
func (c *client) AddWithConfig(flag string, logInstance *zap.Logger, databaseConfig *define.Database, extraFieldList []string) error {
	dbClient := &define.DBClient{
		DbFlag:         flag,
		LoggerInstance: logInstance,
		master:         nil,
		slave:          nil,
		ExtraFieldList: extraFieldList,
		Cfg:            define.Driver{},
	}
	var err error
	if dbClient.master, err = c.GetDatabaseClient(databaseConfig.Master, logInstance); nil != err {
		return err
	}
	if dbClient.slave, err = c.GetDatabaseClient(databaseConfig.Slave, logInstance); nil != err {
		return err
	}
	c.lock.Lock()
	c.clientTable[dbClient.dbFlag] = dbClient
	c.lock.Unlock()
	return nil
}

// BatchAddWithConfigDir 自动读取目录下配置文件, 生成客户端
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 19:19 2022/6/5
func (c *client) BatchAddWithConfigDir(cfgDir string, logInstance *zap.Logger, extraFieldList []string) error {
	filepathNames, _ := filepath.Glob(filepath.Join(cfgDir, "*"))
	for i := range filepathNames {
		if err := c.AddWithConfigFile(filepathNames[i], logInstance, extraFieldList); nil != err {
			return err
		}
	}
	return nil
}

// getCfg 读取配置
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 18:05 2022/6/11
func (c *client) getCfg(cfgPath string) (*define.CfgFile, error) {
	fileArr := strings.Split(cfgPath, ".")
	if len(fileArr) < 2 {
		// 获取不到类型
		return nil, errors.New("文件格式必须是JSON或者YAML")
	}
	fileType := strings.ToLower(fileArr[len(fileArr)-1])
	fileFlagArr := strings.Split(fileArr[0], string(filepath.Separator))
	result := &define.CfgFile{
		Path:   cfgPath,
		Type:   "",
		Flag:   fileFlagArr[len(fileFlagArr)-1],
		Config: &define.Database{},
	}
	var (
		err     error
		cfgInfo define.Database
	)
	switch fileType {
	case consts.FileTypeYaml:
		fallthrough
	case consts.FileTypeYml:
		result.Type = consts.FileTypeYaml
		if err = serialize.File.ReadYmlContent(cfgPath, &result.Config); nil != err {
			return nil, fmt.Errorf("%s 配置文件解析失败, 原因 : %s", cfgPath, err.Error())
		}
	case consts.FileTypeJson:
		result.Type = consts.FileTypeJson
		if err = serialize.File.ReadJSONContent(cfgPath, &cfgInfo); nil != err {
			return nil, fmt.Errorf("%s 配置文件解析失败, 原因 : %s", cfgPath, err.Error())
		}
	default:
		// 不是JSON , 也不是YML, 跳过
		return nil, nil
	}
	if len(result.Config.Master.Timezone) == 0 {
		// 默认使用本地时区
		result.Config.Master.Timezone = "Local"
	} else {
		result.Config.Slave.Timezone = result.Config.Master.Timezone
	}
	return result, nil
}

// GetDBClient 获取db client
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 19:32 2022/6/5
func (c *client) GetDBClient(dbFlag string) (*define.DBClient, error) {
	c.lock.RLock()
	defer c.lock.RUnlock()
	var (
		exist    bool
		dbClient *define.DBClient
	)
	if dbClient, exist = c.clientTable[dbFlag]; !exist {
		return nil, fmt.Errorf("%s 标识的数据库实例不存在! ", dbFlag)
	}
	return dbClient, nil
}

// GetMasterClient 获取主库客户端
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 19:36 2022/6/5
func (c *client) GetMasterClient(ctx context.Context, dbFlag string) (*gorm.DB, error) {
	var (
		err      error
		dbClient *define.DBClient
	)
	if dbClient, err = c.GetDBClient(dbFlag); nil != err {
		return nil, err
	}
	return dbClient.GetMaster(ctx), nil
}

// GetSlaveClient 获取从库客户端
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 19:37 2022/6/5
func (c *client) GetSlaveClient(ctx context.Context, dbFlag string) (*gorm.DB, error) {
	var (
		err      error
		dbClient *define.DBClient
	)
	if dbClient, err = c.GetDBClient(dbFlag); nil != err {
		return nil, err
	}

	return dbClient.GetSlave(ctx), nil
}

// getGormClient 获取GORM client方法
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 11:24 2022/6/6
func (c *client) getGormClient() (*gorm.DB, error) {
	return nil, nil
}

// GetDatabaseClient 获取数据库连接
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 18:41 2022/6/11
func (c *client) GetDatabaseClient(conf *define.Driver, logInstance *zap.Logger) (*gorm.DB, error) {
	var (
		instance *gorm.DB
		err      error
	)

	if conf.DBType == consts.DatabaseDriverMysql {
		if instance, err = gorm.Open(mysql.Open(c.buildConnectionDSN(conf)), &gorm.Config{}); nil != err {
			return nil, err
		}
	} else if conf.DBType == consts.DatabaseDriverSqlite3 {
		if instance, err = gorm.Open(sqlite.Open(c.buildConnectionDSN(conf)), &gorm.Config{}); nil != err {
			return nil, err
		}
	} else {
		return nil, fmt.Errorf("%v : db driver is not support", conf.DBType)
	}

	instance.Logger = wrapper.NewGormLoggerWithInstance(nil, instance, logInstance, "", nil)

	return instance, nil
}

// buildConnectionDSN 构建连接信息
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 18:42 2022/6/11
func (c *client) buildConnectionDSN(conf *define.Driver) string {
	if conf.DBType == consts.DatabaseDriverSqlite3 {
		// 兼容sqlite3
		return conf.Host
	}
	return fmt.Sprintf(
		"%s:%s@tcp(%s:%d)/%s?charset=%s&parseTime=True&loc=%s",
		conf.Username,
		conf.Password,
		conf.Host,
		conf.Port,
		conf.Database,
		conf.Charset,
		conf.Timezone,
	)
}