package draftbot

import (
	room "git.fromouter.space/mcg/cardgage/room/api"
	"github.com/go-kit/kit/log"
)

// DraftBot is the functional part of draftbot
type DraftBot struct {
	API      BotInterface
	Logger   log.Logger
	Name     string
	Rooms    map[string]roomInfo
	Sessions map[string]*session
}

type roomInfo struct {
	Name  string
	Owner string
}

// BotInterface is the interface needed by draftbot for working in cardgage
// This exists so that draftbot can be attached to a mocked API for testing
type BotInterface interface {
	Send(room.BotMessage)
}

// NewDraftBot creates a new draft bot instance with the given name
// and communication interface
func NewDraftBot(botAPI BotInterface, name string) *DraftBot {
	return &DraftBot{
		API:      botAPI,
		Name:     name,
		Rooms:    make(map[string]roomInfo),
		Sessions: make(map[string]*session),
	}
}

// OnMessage is the function to be called when messages are received
func (d *DraftBot) OnMessage(msg room.ServerMessage) {
	switch msg.Type {
	case room.MsgMessage:
		if d.Logger != nil {
			d.Logger.Log("event", "message",
				"roomid", msg.RoomID,
				"from", msg.Message.From,
				"to", msg.Message.To,
				"content", msg.Message.Message)
		}
		// Only consider messages that speak directly to me
		if msg.Message.To == d.Name {
			d.handleMessage(msg.RoomID, *msg.Message)
		}
	case room.MsgEvent:
		if d.Logger != nil {
			d.Logger.Log("event", "event",
				"roomid", msg.RoomID,
				"content", msg.Event.Message)
		}
		d.handleEvent(msg.RoomID, *msg.Event)
	}
}

func (d *DraftBot) sendMessage(roomid string, msg room.Message) {
	d.API.Send(room.BotMessage{
		RoomID:  roomid,
		Type:    room.MsgMessage,
		Message: &msg,
	})
}

func (d *DraftBot) handleMessage(roomid string, msg room.Message) {
	// Get session in room
	session, ok := d.Sessions[roomid]
	if !ok {
		// Room does not have a currently running session, ignore unless it's the owner asking for specific stuff
		d.commands(commandMap{
			// Owner wants to create a session
			"create": d.cmdfnOnlyOwner(d.cmdCreateSession),
		})(roomid, msg)
		return
	}

	// Check if player is in the draft
	_, ok = session.Players[msg.From]
	if !ok {
		// Player not in draft, are they asking to join?
		d.commands(commandMap{
			// Player wants to join the session
			"join": d.cmdJoinSession,
			// Owner wants to start the session (but not partecipate)
			"start": d.cmdfnOnlyOwner(d.cmdStartSession),
		})(roomid, msg)
		return
	}

	// Players in the draft session
	d.commands(commandMap{
		// Player has picked a card
		"pick": d.cmdPickCard,
		// Owner wants to start the session
		"start": d.cmdfnOnlyOwner(d.cmdStartSession),
	})(roomid, msg)
}

func (d *DraftBot) handleEvent(roomid string, evt room.Event) {
	switch evt.Type {

	// Got added to a new room
	case room.EvtNewRoom:
		// Add room to the list
		d.Rooms[evt.Room.Id] = roomInfo{
			Name:  evt.Room.Name,
			Owner: evt.Room.Creator,
		}

	// Someone left
	case room.EvtLeft:
		// Check if room has a running session
		sess, ok := d.Sessions[roomid]
		if !ok {
			break
		}
		// Check if player is in that session
		player, ok := sess.Players[evt.PlayerName]
		if !ok {
			break
		}
		// Replace player with bot
		//TODO
		_ = player

	// A room got closed
	case room.EvtRoomClosed:
		// Check if there's a session there
		session, ok := d.Sessions[roomid]
		if ok {
			// Close session
			session.exit <- true
			// Remove session from list
			delete(d.Sessions, roomid)
		}
		// Remove room from list
		delete(d.Rooms, roomid)
	}
}

func (d *DraftBot) handleSessionMessages(roomid string, s *session) {
	for msg := range s.messages {
		d.sendMessage(roomid, msg)
	}
}