package game_service

import (
	"context"
	"errors"
	"net/mail"
	"strings"
	"unicode/utf8"
)

var ErrInvalidRegistration = errors.New("Укажите название команды (до 255 символов), почту капитана и положительное количество участников")

type Registration struct {
	Name              string `json:"name"`
	Email             string `json:"email"`
	ParticipantsCount int32  `json:"participantsCount"`
}

func (r *Registration) Validate() error {
	r.Name = strings.TrimSpace(r.Name)
	r.Email = strings.TrimSpace(r.Email)
	address, err := mail.ParseAddress(r.Email)
	if r.Name == "" || !utf8.ValidString(r.Name) || strings.ContainsRune(r.Name, 0) || utf8.RuneCountInString(r.Name) > 255 ||
		err != nil || address.Address != r.Email || len(r.Email) > 254 || r.ParticipantsCount <= 0 {
		return ErrInvalidRegistration
	}
	return nil
}

func (s *GameService) RegisterTeam(ctx context.Context, gameID int, deliveryID string, registration Registration) (int, error) {
	if err := registration.Validate(); err != nil {
		return 0, err
	}
	if gameID <= 0 || deliveryID == "" || len(deliveryID) > 255 || strings.ContainsRune(deliveryID, 0) {
		return 0, ErrInvalidRegistration
	}
	password, err := s.passwordGenerator.Generate()
	if err != nil {
		return 0, err
	}
	return s.teamsRepo.RegisterTeam(ctx, gameID, deliveryID, registration.Name, registration.Email, registration.ParticipantsCount, password)
}