package matrixbotlib

import (
	"errors"
	"fmt"
	"log"
	"strings"

	"maunium.net/go/mautrix"
	"maunium.net/go/mautrix/event"
)

var (
	//ErrCmdParseNoPrefix means no prefix was found
	ErrCmdParseNoPrefix = errors.New("no prefix found")
	//ErrCmdParseNoCmd means no actual commands were found
	ErrCmdParseNoCmd = errors.New("nothing to parse from command")
)

//ParseCommand takes a Event and pulls a command + args if available
func ParseCommand(evt *event.Event, prefix string) ([]string, error) {
	body := evt.Content.AsMessage().Body
	bodyS := strings.Split(body, " ")
	if bodyS[0] != fmt.Sprintf("!%v", prefix) {
		return []string{}, errors.New("no prefix found")
	}
	if len(bodyS) < 2 {
		return []string{}, errors.New("nothing to parse from command")
	}

	return bodyS[1:], nil
}

//AcceptAllRoomInvites adds a handler to join all rooms invited to
func AcceptAllRoomInvites(client *mautrix.Client) {
	syncer := client.Syncer.(*mautrix.DefaultSyncer)
	syncer.OnEventType(event.StateMember, func(source mautrix.EventSource, evt *event.Event) {
		if evt.Content.AsMember().Membership.IsInviteOrJoin() {
			_, err := client.JoinRoomByID(evt.RoomID)
			if err != nil {
				log.Printf("error joining room %v\n", evt.RoomID)
			} else {
				log.Printf("joined room %v\n", evt.RoomID)
			}
		}
	})
}