package config

import (
	"github.com/BurntSushi/toml"
	"log"
	"os"
	"reflect"
	"strings"
	"time"
)

const (
	EVENT_JOIN_LEAVE        = "join_leave"
	EVENT_TOPIC_CHANGE      = "topic_change"
	EVENT_FAILURE           = "failure"
	EVENT_FILE_FAILURE_SIZE = "file_failure_size"
	EVENT_AVATAR_DOWNLOAD   = "avatar_download"
	EVENT_REJOIN_CHANNELS   = "rejoin_channels"
	EVENT_USER_ACTION       = "user_action"
	EVENT_MSG_DELETE        = "msg_delete"
)

type Message struct {
	Text      string    `json:"text"`
	Channel   string    `json:"channel"`
	Username  string    `json:"username"`
	UserID    string    `json:"userid"` // userid on the bridge
	Avatar    string    `json:"avatar"`
	Account   string    `json:"account"`
	Event     string    `json:"event"`
	Protocol  string    `json:"protocol"`
	Gateway   string    `json:"gateway"`
	Timestamp time.Time `json:"timestamp"`
	ID        string    `json:"id"`
	Extra     map[string][]interface{}
}

type FileInfo struct {
	Name    string
	Data    *[]byte
	Comment string
	URL     string
	Size    int64
	Avatar  bool
	SHA     string
}

type ChannelInfo struct {
	Name        string
	Account     string
	Direction   string
	ID          string
	SameChannel map[string]bool
	Options     ChannelOptions
}

type Protocol struct {
	AuthCode               string // steam
	BindAddress            string // mattermost, slack // DEPRECATED
	Buffer                 int    // api
	Charset                string // irc
	Debug                  bool   // general
	EditSuffix             string // mattermost, slack, discord, telegram, gitter
	EditDisable            bool   // mattermost, slack, discord, telegram, gitter
	IconURL                string // mattermost, slack
	IgnoreNicks            string // all protocols
	IgnoreMessages         string // all protocols
	Jid                    string // xmpp
	Login                  string // mattermost, matrix
	MediaDownloadSize      int    // all protocols
	MediaServerDownload    string
	MediaServerUpload      string
	MessageDelay           int        // IRC, time in millisecond to wait between messages
	MessageFormat          string     // telegram
	MessageLength          int        // IRC, max length of a message allowed
	MessageQueue           int        // IRC, size of message queue for flood control
	MessageSplit           bool       // IRC, split long messages with newlines on MessageLength instead of clipping
	Muc                    string     // xmpp
	Name                   string     // all protocols
	Nick                   string     // all protocols
	NickFormatter          string     // mattermost, slack
	NickServNick           string     // IRC
	NickServUsername       string     // IRC
	NickServPassword       string     // IRC
	NicksPerRow            int        // mattermost, slack
	NoHomeServerSuffix     bool       // matrix
	NoTLS                  bool       // mattermost
	Password               string     // IRC,mattermost,XMPP,matrix
	PrefixMessagesWithNick bool       // mattemost, slack
	Protocol               string     // all protocols
	RejoinDelay            int        // IRC
	ReplaceMessages        [][]string // all protocols
	ReplaceNicks           [][]string // all protocols
	RemoteNickFormat       string     // all protocols
	Server                 string     // IRC,mattermost,XMPP,discord
	ShowJoinPart           bool       // all protocols
	ShowTopicChange        bool       // slack
	ShowEmbeds             bool       // discord
	SkipTLSVerify          bool       // IRC, mattermost
	StripNick              bool       // all protocols
	Team                   string     // mattermost
	Token                  string     // gitter, slack, discord, api
	URL                    string     // mattermost, slack // DEPRECATED
	UseAPI                 bool       // mattermost, slack
	UseSASL                bool       // IRC
	UseTLS                 bool       // IRC
	UseFirstName           bool       // telegram
	UseUserName            bool       // discord
	UseInsecureURL         bool       // telegram
	WebhookBindAddress     string     // mattermost, slack
	WebhookURL             string     // mattermost, slack
	WebhookUse             string     // mattermost, slack, discord
}

type ChannelOptions struct {
	Key        string // irc
	WebhookURL string // discord
}

type Bridge struct {
	Account     string
	Channel     string
	Options     ChannelOptions
	SameChannel bool
}

type Gateway struct {
	Name   string
	Enable bool
	In     []Bridge
	Out    []Bridge
	InOut  []Bridge
}

type SameChannelGateway struct {
	Name     string
	Enable   bool
	Channels []string
	Accounts []string
}

type Config struct {
	Api                map[string]Protocol
	IRC                map[string]Protocol
	Mattermost         map[string]Protocol
	Matrix             map[string]Protocol
	Slack              map[string]Protocol
	Steam              map[string]Protocol
	Gitter             map[string]Protocol
	Xmpp               map[string]Protocol
	Discord            map[string]Protocol
	Telegram           map[string]Protocol
	Rocketchat         map[string]Protocol
	Sshchat            map[string]Protocol
	General            Protocol
	Gateway            []Gateway
	SameChannelGateway []SameChannelGateway
}

type BridgeConfig struct {
	Config  Protocol
	General *Protocol
	Account string
	Remote  chan Message
}

func NewConfig(cfgfile string) *Config {
	var cfg Config
	if _, err := toml.DecodeFile(cfgfile, &cfg); err != nil {
		log.Fatal(err)
	}
	fail := false
	for k, v := range cfg.Mattermost {
		res := Deprecated(v, "mattermost."+k)
		if res {
			fail = res
		}
	}
	for k, v := range cfg.Slack {
		res := Deprecated(v, "slack."+k)
		if res {
			fail = res
		}
	}
	for k, v := range cfg.Rocketchat {
		res := Deprecated(v, "rocketchat."+k)
		if res {
			fail = res
		}
	}
	if fail {
		log.Fatalf("Fix your config. Please see changelog for more information")
	}
	if cfg.General.MediaDownloadSize == 0 {
		cfg.General.MediaDownloadSize = 1000000
	}
	return &cfg
}

func OverrideCfgFromEnv(cfg *Config, protocol string, account string) {
	var protoCfg Protocol
	val := reflect.ValueOf(cfg).Elem()
	// loop over the Config struct
	for i := 0; i < val.NumField(); i++ {
		typeField := val.Type().Field(i)
		// look for the protocol map (both lowercase)
		if strings.ToLower(typeField.Name) == protocol {
			// get the Protocol struct from the map
			data := val.Field(i).MapIndex(reflect.ValueOf(account))
			protoCfg = data.Interface().(Protocol)
			protoStruct := reflect.ValueOf(&protoCfg).Elem()
			// loop over the found protocol struct
			for i := 0; i < protoStruct.NumField(); i++ {
				typeField := protoStruct.Type().Field(i)
				// build our environment key (eg MATTERBRIDGE_MATTERMOST_WORK_LOGIN)
				key := "matterbridge_" + protocol + "_" + account + "_" + typeField.Name
				key = strings.ToUpper(key)
				// search the environment
				res := os.Getenv(key)
				// if it exists and the current field is a string
				// then update the current field
				if res != "" {
					fieldVal := protoStruct.Field(i)
					if fieldVal.Kind() == reflect.String {
						log.Printf("config: overriding %s from env with %s\n", key, res)
						fieldVal.Set(reflect.ValueOf(res))
					}
				}
			}
			// update the map with the modified Protocol (cfg.Protocol[account] = Protocol)
			val.Field(i).SetMapIndex(reflect.ValueOf(account), reflect.ValueOf(protoCfg))
			break
		}
	}
}

func GetIconURL(msg *Message, cfg *Protocol) string {
	iconURL := cfg.IconURL
	info := strings.Split(msg.Account, ".")
	protocol := info[0]
	name := info[1]
	iconURL = strings.Replace(iconURL, "{NICK}", msg.Username, -1)
	iconURL = strings.Replace(iconURL, "{BRIDGE}", name, -1)
	iconURL = strings.Replace(iconURL, "{PROTOCOL}", protocol, -1)
	return iconURL
}

func Deprecated(cfg Protocol, account string) bool {
	if cfg.BindAddress != "" {
		log.Printf("ERROR: %s BindAddress is deprecated, you need to change it to WebhookBindAddress.", account)
	} else if cfg.URL != "" {
		log.Printf("ERROR: %s URL is deprecated, you need to change it to WebhookURL.", account)
	} else if cfg.UseAPI {
		log.Printf("ERROR: %s UseAPI is deprecated, it's enabled by default, please remove it from your config file.", account)
	} else {
		return false
	}
	return true
	//log.Fatalf("ERROR: Fix your config: %s", account)
}