// Copyright 2016 fatedier, fatedier@gmail.com
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package config

import (
	"fmt"
	"os"
	"strconv"
	"strings"

	ini "github.com/vaughan0/go-ini"
)

var ClientCommonCfg *ClientCommonConf

// client common config
type ClientCommonConf struct {
	ConfigFile        string
	ServerAddr        string
	ServerPort        int64
	HttpProxy         string
	LogFile           string
	LogWay            string
	LogLevel          string
	LogMaxDays        int64
	PrivilegeToken    string
	PoolCount         int
	TcpMux            bool
	User              string
	LoginFailExit     bool
	Start             map[string]struct{}
	HeartBeatInterval int64
	HeartBeatTimeout  int64
}

func GetDeaultClientCommonConf() *ClientCommonConf {
	return &ClientCommonConf{
		ConfigFile:        "./frpc.ini",
		ServerAddr:        "0.0.0.0",
		ServerPort:        7000,
		HttpProxy:         "",
		LogFile:           "console",
		LogWay:            "console",
		LogLevel:          "info",
		LogMaxDays:        3,
		PrivilegeToken:    "",
		PoolCount:         1,
		TcpMux:            true,
		User:              "",
		LoginFailExit:     true,
		Start:             make(map[string]struct{}),
		HeartBeatInterval: 30,
		HeartBeatTimeout:  90,
	}
}

func LoadClientCommonConf(conf ini.File) (cfg *ClientCommonConf, err error) {
	var (
		tmpStr string
		ok     bool
		v      int64
	)
	cfg = GetDeaultClientCommonConf()

	tmpStr, ok = conf.Get("common", "server_addr")
	if ok {
		cfg.ServerAddr = tmpStr
	}

	tmpStr, ok = conf.Get("common", "server_port")
	if ok {
		cfg.ServerPort, _ = strconv.ParseInt(tmpStr, 10, 64)
	}

	tmpStr, ok = conf.Get("common", "http_proxy")
	if ok {
		cfg.HttpProxy = tmpStr
	} else {
		// get http_proxy from env
		cfg.HttpProxy = os.Getenv("http_proxy")
	}

	tmpStr, ok = conf.Get("common", "log_file")
	if ok {
		cfg.LogFile = tmpStr
		if cfg.LogFile == "console" {
			cfg.LogWay = "console"
		} else {
			cfg.LogWay = "file"
		}
	}

	tmpStr, ok = conf.Get("common", "log_level")
	if ok {
		cfg.LogLevel = tmpStr
	}

	tmpStr, ok = conf.Get("common", "log_max_days")
	if ok {
		cfg.LogMaxDays, _ = strconv.ParseInt(tmpStr, 10, 64)
	}

	tmpStr, ok = conf.Get("common", "privilege_token")
	if ok {
		cfg.PrivilegeToken = tmpStr
	}

	tmpStr, ok = conf.Get("common", "pool_count")
	if ok {
		v, err = strconv.ParseInt(tmpStr, 10, 64)
		if err != nil {
			cfg.PoolCount = 1
		} else {
			cfg.PoolCount = int(v)
		}
	}

	tmpStr, ok = conf.Get("common", "tcp_mux")
	if ok && tmpStr == "false" {
		cfg.TcpMux = false
	} else {
		cfg.TcpMux = true
	}

	tmpStr, ok = conf.Get("common", "user")
	if ok {
		cfg.User = tmpStr
	}

	tmpStr, ok = conf.Get("common", "start")
	if ok {
		proxyNames := strings.Split(tmpStr, ",")
		for _, name := range proxyNames {
			cfg.Start[name] = struct{}{}
		}
	}

	tmpStr, ok = conf.Get("common", "login_fail_exit")
	if ok && tmpStr == "false" {
		cfg.LoginFailExit = false
	} else {
		cfg.LoginFailExit = true
	}

	tmpStr, ok = conf.Get("common", "heartbeat_timeout")
	if ok {
		v, err = strconv.ParseInt(tmpStr, 10, 64)
		if err != nil {
			err = fmt.Errorf("Parse conf error: heartbeat_timeout is incorrect")
			return
		} else {
			cfg.HeartBeatTimeout = v
		}
	}

	tmpStr, ok = conf.Get("common", "heartbeat_interval")
	if ok {
		v, err = strconv.ParseInt(tmpStr, 10, 64)
		if err != nil {
			err = fmt.Errorf("Parse conf error: heartbeat_interval is incorrect")
			return
		} else {
			cfg.HeartBeatInterval = v
		}
	}

	if cfg.HeartBeatInterval <= 0 {
		err = fmt.Errorf("Parse conf error: heartbeat_interval is incorrect")
		return
	}

	if cfg.HeartBeatTimeout < cfg.HeartBeatInterval {
		err = fmt.Errorf("Parse conf error: heartbeat_timeout is incorrect, heartbeat_timeout is less than heartbeat_interval")
		return
	}
	return
}