package db

import (
	"fmt"
	_ "github.com/go-sql-driver/mysql"
	_ "github.com/lib/pq"
	"golib.gaore.com/GaoreGo/grconfig"
	"golib.gaore.com/GaoreGo/grlogs"
	"path"
)

const DEFAULT = "default"

var DbPrefix map[string]string = make(map[string]string)

type dsnConfig struct {
	Dsn    string
	Driver string
	Item   *DbItem
}

type DbItem struct {
	User            string `yaml:"user"`
	Pass            string `yaml:"pass"`
	Host            string `yaml:"host"`
	Port            int    `yaml:"port"`
	Name            string `yaml:"name"`
	Driver          string `yaml:"driver"`
	Prefix          string `yaml:"prefix"`
	MaxIdleConns    int    `yaml:"max_idle_conns"`
	MaxOpenConns    int    `yaml:"max_open_conns"`
	ConnMaxLifetime int64  `yaml:"conn_max_lifetime"`
	Timeout         int    `yaml:"timeout"`
}

func (d *DbItem) Dsn() string {
	if d.Timeout <= 0 {
		d.Timeout = 5
	}
	return fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=utf8&loc=Local&autocommit=true&timeout=%ds", d.User, d.Pass, d.Host, d.Port, d.Name, d.Timeout)
}

func init() {
	// Reload() 不再自动链接数据库了， 需要自己手动
}

func ReloadByDefault() {
	Reload(nil)
}

func Reload(files []string, dir ...string) {
	var err error
	var configer *grconfig.Configer
	logger := grlogs.GetAli("sql")

	defer func() {
		if err != nil {
			logger.Critical(err.Error())
		}
	}()

	if len(dir) == 0 {
		configer = grconfig.New("conf/")
	} else {
		dir = append(dir, "conf/")
		configer = grconfig.New(path.Join(dir...))
	}
	dsns, err := GetDsn(configer, files...)
	if err = LoadXorm(dsns); err != nil {
		logger.Critical(err.Error())
	}
}

func GetDsn(configer *grconfig.Configer, dbfiles ...string) (DsnList map[string]dsnConfig, err error) {
	var items map[string]*DbItem
	DsnList = make(map[string]dsnConfig)

	if nil == dbfiles || len(dbfiles) == 0 {
		dbfiles = []string{"db"}
	}

	for _, dbfile := range dbfiles {

		if dbfile == "" {
			continue
		}

		err = configer.Item(dbfile, &items)
		if err != nil {
			return
		}
		for alias, v := range items {
			dsn := v.Dsn()
			driver := v.Driver
			if driver == "" {
				driver = "mysql"
			}
			DsnList[alias] = dsnConfig{Dsn: dsn, Driver: driver, Item: v}
		}
	}

	return
}