package odbc

import (
	"fmt"
	"os"
	"strings"

	odb "git.wecise.com/wecise/odb-go/odb"
	"github.com/scylladb/go-set/strset"
	ucfg "github.com/wecisecode/util/cfg"
)

var ODBClient odb.Client
var ODBError error

var ODBServerPath string
var ODBCDebug bool

var default_keyspace = `oktest`
var default_odbpaths = `127.0.0.1:11001`

var keyspace string
var default_config = &odb.Config{
	Hosts:    []string{default_odbpaths},
	Keyspace: default_keyspace,
	User:     DefaultAppName,
	Pass:     "********",
	PoolSize: 20,
	Debug:    false,
}

var CommandArgsInfo = func() string { return "" }

func Usage() string {
	return `
命令行参数：` + CommandArgsInfo() + `
odbpath=` + default_odbpaths + `    # 指定odbserver路径，默认通过环境变量ODBPATH或通过ETCD相关配置获取
keyspace=` + default_keyspace + `    # 指定keyspace，默认通过环境变量KEYSPACE获取
	
环境变量需求：
ODBPATH=` + default_odbpaths + `    # 指定odbserver路径，默认通过配置信息 odbc.odbpath 获取
KEYSPACE=` + default_keyspace + `            # 指定keyspace，默认通过配置信息 odbc.keyspace 获取
ETCDPATH=127.0.0.1:2379    # 必须设置
ETCDUSER=
ETCDPASS=
CASSANDRAPATH=127.0.0.1
CASSANDRALOOKUP=false
NATSPATH=nats://user:N5JbKeT1C3uOUh317OVXjg==@127.0.0.1:4222

LANG=zh_CN.utf8
LC_ALL=zh_CN.utf8

可通过` + DefaultAppName + `.conf配置运行参数：
[odbc]
;指定odbserver路径
odbpath=` + default_odbpaths + `
;指定keyspace
keyspace=` + default_keyspace + `
`
}

func LogConfigInfo() {
	Logger.Info("odbpath:    ", ODBClient.Config().Hosts)
	Logger.Info("keyspace:   ", ODBClient.Config().Keyspace)
}

func config_merge(a *odb.Config, b *odb.Config) *odb.Config {
	if len(b.Hosts) > 0 {
		a.Hosts = b.Hosts
	}
	if b.Port != 0 {
		a.Port = b.Port
	}
	if b.Keyspace != "" {
		a.Keyspace = b.Keyspace
	}
	if b.User != "" {
		a.User = b.User
	}
	if b.Pass != "" {
		a.Pass = b.Pass
	}
	if b.PoolSize != 0 {
		a.PoolSize = b.PoolSize
	}
	if b.Debug {
		a.Debug = b.Debug
	}
	return a
}

var odbcfg = default_config

func init() {
	default_keyspace = odbcfg.Keyspace
	default_odbpaths = strings.Join(odbcfg.Hosts, ",")
	odbpaths := strset.New(strings.Split(
		ucfg.CommandArgs.GetString("odbpath", strings.Join(
			ucfg.Environs.GetStrings("ODBPATH",
				Config.GetStrings("odbc.odbpath", default_odbpaths)...), ",")), ",")...).List()
	keyspace = ucfg.CommandArgs.GetString("keyspace",
		ucfg.Environs.GetString("KEYSPACE",
			Config.GetString("odbc.keyspace", default_keyspace)))
	ODBCDebug = Config.GetBool("odbc.debug", false) || Config.GetString("odbc.debug") == "odbc.debug"
	odbcfg = config_merge(odbcfg, &odb.Config{
		Keyspace: keyspace,
		Hosts:    odbpaths,
		Debug:    ODBCDebug,
	})
	ODBServerPath = "[" + strings.Join(odbcfg.Hosts, ",") + "]"
	keyspace = odbcfg.Keyspace
}

func Keyspace() string {
	return keyspace
}

// 可以通过命令行，环境变量 或 与应用同名的 .conf 配置文件 设置
// 远程连接需要在白名单中增加本地IP
// 此函数仅用于示范和简化 与 odbserver 建立连接的过程，建议应用根据实际使用场景调用 odb.NewClient
func ODBC() odb.Client {
	ODBClient, ODBError = odb.NewClient(odbcfg)
	if ODBError != nil {
		fmt.Print(Usage())
		if strings.Contains(ODBError.Error(), "error: EOF") {
			println("\n!!!should add your ip to odbserver whitelist!!!\n")
			os.Exit(1)
		}
		panic(ODBError)
	}
	LogConfigInfo()
	return ODBClient
}