package models

import (
	"database/sql"
	"log"
	"net/url"
	"strconv"
)

type SameBookingError struct{}

func (e SameBookingError) Error() string {
	return "the same booking already exists!"
}

type Booking struct {
	CardID      string `json:"cradID"`
	ReaderID    string `json:"readerID"`
	BookingType int    `json:"bookingTyp"`
}

func (b Booking) New(card_id string, reader_id string, booking_type int) Booking {
	return Booking{
		CardID:      card_id,
		ReaderID:    reader_id,
		BookingType: booking_type,
	}
}

func (b *Booking) FromUrlParams(params url.Values) Booking {
	bookingType, err := strconv.Atoi(params.Get("bookingType"))
	if err != nil {
		log.Println("Error parsing bookingType: ", err)
		return b.New("", "", 0)
	}
	cardID := params.Get("cardID")
	readerID := params.Get("readerID")
	return Booking{BookingType: bookingType, CardID: cardID, ReaderID: readerID}
}

func (b Booking) Verify() bool {
	if b.CardID == "" || b.ReaderID == "" || b.BookingType == 0 {
		return false
	}
	return true
}

func (b Booking) Insert(db *sql.DB) error {
	if !checkLastBooking(b, db) {
		return SameBookingError{}
	}
	stmt, err := db.Prepare((`INSERT INTO zeiten (card_id, reader_id, booking_type) VALUES ($1, $2, $3)`))
	if err != nil {
		return err
	}
	_, err = stmt.Query(b.CardID, b.ReaderID, b.BookingType)
	if err != nil {
		return err
	}
	return nil
}

func checkLastBooking(b Booking, db *sql.DB) bool {
	var booking_type int
	stmt, err := db.Prepare((`SELECT booking_type FROM "zeiten" WHERE "card_id" = $1 ORDER BY "logged_time" DESC LIMIT 1;`))
	if err != nil {
		log.Fatalf("Error preparing query: %v", err)
		return false
	}
	err = stmt.QueryRow(b.CardID).Scan(&booking_type)
	if err == sql.ErrNoRows {
		return true
	}
	if err != nil {
		log.Println("Error checking last booking: ", err)
		return false
	}
	if booking_type == b.BookingType {
		return false
	}
	return true
}