package main

import (
	"encoding/json"
	"flag"
	"io/ioutil"
	"os"
	"time"

	"github.com/hashicorp/go-version"

	"github.com/imdario/mergo"

	"github.com/liip/sheriff"

	"github.com/sirupsen/logrus"
)

// Command line flag global variables
var debug bool
var configFile string

// NewStreamCore do load config file
func NewStreamCore() *StorageST {
	flag.BoolVar(&debug, "debug", true, "set debug mode")
	flag.StringVar(&configFile, "config", "config.json", "config patch (/etc/server/config.json or config.json)")
	flag.Parse()

	var tmp StorageST
	data, err := ioutil.ReadFile(configFile)
	if err != nil {
		log.WithFields(logrus.Fields{
			"module": "config",
			"func":   "NewStreamCore",
			"call":   "ReadFile",
		}).Errorln(err.Error())
		os.Exit(1)
	}
	err = json.Unmarshal(data, &tmp)
	if err != nil {
		log.WithFields(logrus.Fields{
			"module": "config",
			"func":   "NewStreamCore",
			"call":   "Unmarshal",
		}).Errorln(err.Error())
		os.Exit(1)
	}
	debug = tmp.Server.Debug

	// 初始化数据库连接
	if tmp.Database.Enabled {
		err = tmp.InitDatabase()
		if err != nil {
			log.WithFields(logrus.Fields{
				"module": "config",
				"func":   "NewStreamCore",
				"call":   "InitDatabase",
			}).Errorln(err.Error())
			os.Exit(1)
		}

		// 从数据库加载流配置
		err = tmp.LoadStreamsFromDatabase()
		if err != nil {
			log.WithFields(logrus.Fields{
				"module": "config",
				"func":   "NewStreamCore",
				"call":   "LoadStreamsFromDatabase",
			}).Errorln(err.Error())
			os.Exit(1)
		}
	}

	// 处理流配置（从配置文件或数据库）
	for i, i2 := range tmp.Streams {
		for i3, i4 := range i2.Channels {
			var channel ChannelST
			err = mergo.Merge(&channel, i4)
			if err != nil {
				log.WithFields(logrus.Fields{
					"module": "config",
					"func":   "NewStreamCore",
					"call":   "Merge",
				}).Errorln(err.Error())
				os.Exit(1)
			}
			channel.clients = make(map[string]ClientST)
			channel.ack = time.Now().Add(-255 * time.Hour)
			channel.hlsSegmentBuffer = make(map[int]SegmentOld)
			channel.signals = make(chan int, 100)
			i2.Channels[i3] = channel
		}
		tmp.Streams[i] = i2
	}

	return &tmp
}

// ClientDelete Delete Client
func (obj *StorageST) SaveConfig() error {
	log.WithFields(logrus.Fields{
		"module": "config",
		"func":   "NewStreamCore",
	}).Debugln("Saving configuration to", configFile)
	v2, err := version.NewVersion("2.0.0")
	if err != nil {
		return err
	}
	data, err := sheriff.Marshal(&sheriff.Options{
		Groups:     []string{"config"},
		ApiVersion: v2,
	}, obj)
	if err != nil {
		return err
	}
	res, err := json.MarshalIndent(data, "", "  ")
	if err != nil {
		return err
	}
	err = ioutil.WriteFile(configFile, res, 0644)
	if err != nil {
		log.WithFields(logrus.Fields{
			"module": "config",
			"func":   "SaveConfig",
			"call":   "WriteFile",
		}).Errorln(err.Error())
		return err
	}
	return nil
}