package game

import (
	"crypto/rand"
	"doudizhu-server/internal/models"
	"encoding/hex"
	"errors"
	"fmt"
)

var (
	ErrRoomNotFound     = errors.New("room not found")
	ErrRoomFull         = errors.New("room is full")
	ErrGameStarted      = errors.New("game already started")
	ErrGameNotStarted   = errors.New("game not started")
	ErrPlayerNotFound   = errors.New("player not found")
	ErrNotEnoughPlayers = errors.New("not enough players")
	ErrPlayerNotReady   = errors.New("player not ready")
	ErrNotYourTurn      = errors.New("not your turn")
	ErrCardsNotInHand   = errors.New("cards not in hand")
	ErrInvalidCardType  = errors.New("invalid card type")
	ErrCannotBeat       = errors.New("cannot beat last play")
	ErrCannotPass       = errors.New("cannot pass")
)

func generateID() string {
	b := make([]byte, 8)
	rand.Read(b)
	return hex.EncodeToString(b)
}

func cardKey(c models.Card) string {
	return fmt.Sprintf("%d_%d", c.Suit, c.Value)
}