package redis

import (
	"fmt"
	"net/url"
	"strconv"
	"sync"
	"time"

	"apigo.cc/go/cast"
	"apigo.cc/go/crypto"
	"apigo.cc/go/log"
	"apigo.cc/go/safe"
)

type Config struct {
	Host           string
	Password       string
	DB             int
	MaxActive      int
	MaxIdle        int
	IdleTimeout    time.Duration
	ConnectTimeout time.Duration
	ReadTimeout    time.Duration
	WriteTimeout   time.Duration
	LogSlow        time.Duration
	logger         *log.Logger
	pwd            *safe.SafeBuf
}

var redisConfigs = make(map[string]*Config)
var redisConfigsLock = sync.RWMutex{}

var confAes, _ = crypto.NewAESGCMAndEraseKey([]byte("?GQ$0K0GgLdO=f+~L68PLm$uhKr4'=tV"), []byte("VFs7@sK61cj^f?HZ"))
var keysOnce = sync.Once{}

func SetEncryptKeys(key, iv []byte) {
	keysOnce.Do(func() {
		confAes.Close()
		confAes, _ = crypto.NewAESGCMAndEraseKey(key, iv)
	})
}

func (conf *Config) ConfigureBy(setting string) {
	redisConfigsLock.Lock()
	redisConfigs[setting] = conf
	redisConfigsLock.Unlock()

	urlInfo, err := url.Parse(setting)
	if err != nil {
		conf.logger.Error(err.Error(), "url", setting)
		return
	}
	if urlInfo.Scheme != "redis" {
		conf.logger.Error("unsupported scheme", "url", setting)
		return
	}

	conf.Host = urlInfo.Host

	dbStr := urlInfo.Query().Get("database")
	if dbStr == "" && len(urlInfo.Path) > 1 {
		dbStr = urlInfo.Path[1:]
	}
	if len(dbStr) > 0 {
		db, err := strconv.Atoi(dbStr)
		if err != nil {
			conf.logger.Error(err.Error(), "url", setting)
		}
		if err == nil && db >= 0 && db <= 15 {
			conf.DB = db
		}
	}

	conf.Password, _ = urlInfo.User.Password()
	conf.LogSlow = cast.Duration(urlInfo.Query().Get("logSlow"))
	conf.MaxIdle = cast.Int(urlInfo.Query().Get("maxIdle"))
	conf.MaxActive = cast.Int(urlInfo.Query().Get("maxActive"))
	conf.ConnectTimeout = cast.Duration(urlInfo.Query().Get("connectTimeout"))
	conf.ReadTimeout = cast.Duration(urlInfo.Query().Get("readTimeout"))
	conf.WriteTimeout = cast.Duration(urlInfo.Query().Get("writeTimeout"))
	conf.IdleTimeout = cast.Duration(urlInfo.Query().Get("idleTimeout"))
}

func (conf *Config) Dsn() string {
	return fmt.Sprintf("redis://:****@%s/%d?timeout=%s&logSlow=%s", conf.Host, conf.DB, conf.ConnectTimeout, conf.LogSlow)
}

func parseByName(name string) *Config {
	// config name support Host:Port
	args := cast.Split(name, ":")
	db := 0
	if len(args) > 1 {
		arg1, err := strconv.Atoi(args[1])
		if err == nil && arg1 >= 0 && arg1 <= 15 {
			name = args[0]
			db = arg1
		}
	}

	redisConfigsLock.RLock()
	conf := redisConfigs[name]
	redisConfigsLock.RUnlock()

	if conf == nil {
		conf = new(Config)
		redisConfigsLock.Lock()
		redisConfigs[name] = conf
		redisConfigsLock.Unlock()

		if len(args) > 1 {
			arg1, err := strconv.Atoi(args[1])
			if err == nil && arg1 >= 0 && arg1 <= 15 {
				conf.DB = arg1
			} else {
				conf.Host = args[0] + ":" + args[1]
			}
		}
	}

	for i := 2; i < len(args); i++ {
		arg2, err := strconv.Atoi(args[i])
		if err == nil {
			if arg2 >= 0 && arg2 <= 15 {
				conf.DB = arg2
			} else {
				conf.Password = args[i]
			}
		} else {
			conf.Password = args[i]
		}
	}

	if conf.DB == 0 && db > 0 && db <= 15 {
		conf.DB = db
	}

	return conf
}