package samechannelgateway

import (
	"github.com/42wim/matterbridge/bridge"
	"github.com/42wim/matterbridge/bridge/config"
	log "github.com/Sirupsen/logrus"
	"strings"
)

type SameChannelGateway struct {
	*config.Config
	MyConfig    *config.SameChannelGateway
	Bridges     map[string]*bridge.Bridge
	Channels    []string
	ignoreNicks map[string][]string
	Name        string
}

func New(cfg *config.Config, gateway *config.SameChannelGateway) error {
	c := make(chan config.Message)
	gw := &SameChannelGateway{}
	gw.Bridges = make(map[string]*bridge.Bridge)
	gw.Name = gateway.Name
	gw.Config = cfg
	gw.MyConfig = gateway
	gw.Channels = gateway.Channels
	for _, account := range gateway.Accounts {
		br := config.Bridge{Account: account}
		log.Infof("Starting bridge: %s", account)
		gw.Bridges[account] = bridge.New(cfg, &br, c)
	}
	for _, br := range gw.Bridges {
		err := br.Connect()
		if err != nil {
			log.Fatalf("Bridge %s failed to start: %v", br.Account, err)
		}
		for _, channel := range gw.Channels {
			log.Infof("%s: joining %s", br.Account, channel)
			br.JoinChannel(channel)
		}
	}
	gw.handleReceive(c)
	return nil
}

func (gw *SameChannelGateway) handleReceive(c chan config.Message) {
	for {
		select {
		case msg := <-c:
			if !gw.ignoreMessage(&msg) {
				for _, br := range gw.Bridges {
					gw.handleMessage(msg, br)
				}
			}
		}
	}
}

func (gw *SameChannelGateway) handleMessage(msg config.Message, dest *bridge.Bridge) {
	// is this a configured channel
	if !gw.validChannel(msg.Channel) {
		return
	}
	// do not send the message to the bridge we come from if also the channel is the same
	if msg.Account == dest.Account {
		return
	}
	gw.modifyUsername(&msg, dest)
	log.Debugf("Sending %#v from %s (%s) to %s (%s)", msg, msg.Account, msg.Channel, dest.Account, msg.Channel)
	err := dest.Send(msg)
	if err != nil {
		log.Error(err)
	}
}

func (gw *SameChannelGateway) ignoreMessage(msg *config.Message) bool {
	for _, entry := range strings.Fields(gw.Bridges[msg.Account].Config.IgnoreNicks) {
		if msg.Username == entry {
			log.Debugf("ignoring %s from %s", msg.Username, msg.Account)
			return true
		}
	}
	return false
}

func (gw *SameChannelGateway) modifyUsername(msg *config.Message, dest *bridge.Bridge) {
	br := gw.Bridges[msg.Account]
	nick := gw.Config.General.RemoteNickFormat
	if nick == "" {
		nick = dest.Config.RemoteNickFormat
	}
	nick = strings.Replace(nick, "{NICK}", msg.Username, -1)
	nick = strings.Replace(nick, "{BRIDGE}", br.Name, -1)
	nick = strings.Replace(nick, "{PROTOCOL}", br.Protocol, -1)
	msg.Username = nick
}

func (gw *SameChannelGateway) validChannel(channel string) bool {
	for _, c := range gw.Channels {
		if c == channel {
			return true
		}
	}
	return false
}