package main

import (
	"fmt"

	"github.com/mitchellh/mapstructure"

	room "git.fromouter.space/mcg/cardgage/room/api"
	"git.fromouter.space/mcg/draft"
)

type commandHandler func(roomid string, msg room.Message)
type commandMap map[string]commandHandler

func (d *DraftBot) commands(commands commandMap) commandHandler {
	return func(roomid string, msg room.Message) {
		action, ok := commands[msg.Type]
		if !ok {
			cmdlist := []string{}
			for cmd := range commands {
				cmdlist = append(cmdlist, cmd)
			}
			d.sendMessage(roomid, room.Message{
				To:      msg.From,
				Type:    "command-unavailable",
				Message: fmt.Sprintf("Available commands (at this state) are: %s", cmdlist),
			})
			return
		}
		action(roomid, msg)
	}
}

func (d *DraftBot) cmdJoinSession(roomid string, msg room.Message) {
	// Get session
	session, _ := d.Sessions[roomid]

	// Players can only join if session didn't start yet
	if session.started {
		d.sendMessage(roomid, room.Message{
			To:      msg.From,
			Type:    "session-already-started",
			Message: "You can't join a running session",
		})
		return
	}

	// Check if there are still open slots
	if len(session.Players)+1 > len(session.Pod.Players) {
		d.sendMessage(roomid, room.Message{
			To:      msg.From,
			Type:    "session-full",
			Message: "There aren't any spots left",
		})
		return
	}

	// Add player to the list
	session.Players[msg.From] = nil

	d.sendMessage(roomid, room.Message{
		Channel: "draft",
		Type:    "player-joined-session",
		Data:    msg.From,
		Message: fmt.Sprintf("%s joined the draft session (%d players, %d missing)", msg.From, len(session.Players), len(session.Pod.Players)-len(session.Players)),
	})
}

func (d *DraftBot) cmdPickCard(roomid string, msg room.Message) {
	// Get session
	session, _ := d.Sessions[roomid]

	// Get player
	player, _ := session.Players[msg.From]

	// Get picked card
	picked := msg.Data.(string)

	// Try to pick on player struct
	err := player.Pick(draft.Card{ID: picked})
	if err != nil {
		if err == draft.ErrNotInPack {
			d.sendMessage(roomid, room.Message{
				To:   msg.From,
				Type: "invalid-pick",
			})
		} else {
			// Technically not needed, as Pick can only throw ErrNotInPack right now
		}
		return
	}
	d.sendMessage(roomid, room.Message{
		Channel: "draft",
		Type:    "card-picked",
		Data: struct {
			Player string
		}{
			msg.From,
		},
		Message: fmt.Sprintf("%s picked a card from his pack", msg.From),
	})
}

func (d *DraftBot) cmdCreateSession(roomid string, msg room.Message) {
	// Get session options from data
	type sessionOptions struct {
		players int
		options draftOptions
	}
	var opt sessionOptions
	err := mapstructure.Decode(msg.Data, &opt)
	if err != nil {
		d.sendMessage(roomid, room.Message{
			To:      msg.From,
			Type:    "invalid-data",
			Message: "Error parsing session options: " + err.Error(),
		})
		return
	}

	sess, err := newSession(opt.players, opt.options)
	if err != nil {
		d.sendMessage(roomid, room.Message{
			To:      msg.From,
			Type:    "session-create-error",
			Data:    err.Error(),
			Message: "Error creating session: " + err.Error(),
		})
		return
	}

	// All ok, assign session
	d.Sessions[roomid] = sess

	// Start handling messages for the session
	go d.handleSessionMessages(roomid, sess)

	// Tell everyone about the new session
	d.sendMessage(roomid, room.Message{
		Channel: "draft",
		Type:    "session-open",
		Data:    opt,
		Message: fmt.Sprintf("Created a new draft session for %d players, type: %s", opt.players, opt.options.Type),
	})
}

func (d *DraftBot) cmdStartSession(roomid string, msg room.Message) {
	// Get session
	session, _ := d.Sessions[roomid]

	// Try starting the session
	err := session.Start()
	if err != nil {
		d.sendMessage(roomid, room.Message{
			To:      msg.From,
			Type:    "session-start-error",
			Data:    err.Error(),
			Message: "Could not start session: " + err.Error(),
		})
		return
	}

	// Tell everyone about the new session
	d.sendMessage(roomid, room.Message{
		Channel: "draft",
		Type:    "session-start",
		Message: "Session started, get drafting!",
	})
}

func (d *DraftBot) cmdfnOnlyOwner(wrapped commandHandler) commandHandler {
	return func(roomid string, msg room.Message) {
		// Get room the message was sent from
		roomData, ok := d.Rooms[roomid]
		if !ok {
			// Message from a room we're not in?
			// Ignore it for now
			return
		}

		// Make sure the message is coming from the room owner
		if msg.From != roomData.Owner {
			d.sendMessage(roomid, room.Message{
				To:      msg.From,
				Type:    "must-be-owner",
				Message: "Sorry, only the room's owner can tell me to do that",
			})
			return
		}

		// Check done, call wrapped function
		wrapped(roomid, msg)
	}
}