package models

import (
	"arbeitszeitmessung/helper"
	"arbeitszeitmessung/helper/logs"
	"database/sql"
	"fmt"
	"log"
	"log/slog"
	"net/url"
	"strconv"
	"time"
)

type SameBookingError struct{}

type BookingType struct {
	Id   int8   `json:"anwesenheit_id"`
	Name string `json:"anwesenheit_name"`
}

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

type Booking struct {
	CardUID     string      `json:"card_uid"`
	GeraetID    int16       `json:"geraet_id"`
	CheckInOut  int16       `json:"check_in_out"`
	Timestamp   time.Time   `json:"timestamp"`
	CounterId   int         `json:"counter_id"`
	BookingType BookingType `json:"anwesenheit_typ"`
}

type IDatabase interface {
	Prepare(query string) (*sql.Stmt, error)
	Exec(query string, args ...any) (sql.Result, error)
}

var DB IDatabase

func (b *Booking) New(cardUid string, gereatId int16, checkInOut int16, typeId int8) Booking {
	bookingType, err := GetBookingTypeById(typeId)
	if err != nil {
		log.Printf("Cannot get booking type %d, from database!", typeId)
	}
	return Booking{
		CardUID:     cardUid,
		GeraetID:    gereatId,
		CheckInOut:  checkInOut,
		BookingType: bookingType,
	}
}

func (b *Booking) FromUrlParams(params url.Values) Booking {
	var booking Booking

	if _check_in_out, err := strconv.Atoi(params.Get("check_in_out")); err == nil {
		booking.CheckInOut = int16(_check_in_out)
	}
	if _geraet_id, err := strconv.Atoi(params.Get("geraet_id")); err == nil {
		booking.GeraetID = int16(_geraet_id)
	}
	if _booking_type, err := strconv.Atoi(params.Get("booking_type")); err == nil {
		booking.BookingType.Id = int8(_booking_type)
	}
	booking.CardUID = params.Get("card_uid")

	return booking
}

func (b *Booking) Verify() bool {
	//check for overlapping time + arbeitszeit verstoß
	if b.CardUID == "" { //|| b.GeraetID == 0 || b.CheckInOut == 0 {
		log.Println("Booking verify failed invalid CardUID!")
		return false
	}
	if b.CheckInOut == 0 {
		log.Println("Booking verify failed invalid CheckInOut!")
		return false
	}
	if bookingType, err := GetBookingTypeById(b.BookingType.Id); err != nil {
		log.Println("Booking verify failed invalid BookingType.Id!")
		return false
	} else {
		b.BookingType.Name = bookingType.Name
	}
	return true
}

func (b *Booking) IsSubmittedAndChecked() bool {
	qStr, err := DB.Prepare(`SELECT bestaetigt from wochen_report WHERE $1 = ANY(anwesenheiten);`)
	if err != nil {
		slog.Warn("Error when preparing SQL Statement", "error", err)
		return false
	}
	defer qStr.Close()
	var isSubmittedAndChecked bool = false

	err = qStr.QueryRow(b.CounterId).Scan(&isSubmittedAndChecked)
	if err == sql.ErrNoRows {
		// No rows found ==> not even submitted
		return false
	}

	if err != nil {
		slog.Warn("Unexpected error when executing SQL Statement", "error", err)
	}
	return isSubmittedAndChecked
}

func (b *Booking) Insert() error {
	if !checkLastBooking(*b) {
		return SameBookingError{}
	}
	stmt, err := DB.Prepare((`INSERT INTO anwesenheit (card_uid, geraet_id, check_in_out, anwesenheit_typ) VALUES ($1, $2, $3, $4) RETURNING counter_id, timestamp`))
	if err != nil {
		return err
	}
	err = stmt.QueryRow(b.CardUID, b.GeraetID, b.CheckInOut, b.BookingType.Id).Scan(&b.CounterId, &b.Timestamp)
	if err != nil {
		return err
	}
	return nil
}

func (b *Booking) InsertWithTimestamp() error {
	if b.Timestamp.IsZero() {
		return b.Insert()
	}
	stmt, err := DB.Prepare((`INSERT INTO anwesenheit (card_uid, geraet_id, check_in_out, anwesenheit_typ, timestamp) VALUES ($1, $2, $3, $4, $5) RETURNING counter_id`))
	if err != nil {
		return err
	}
	err = stmt.QueryRow(b.CardUID, b.GeraetID, b.CheckInOut, b.BookingType.Id, b.Timestamp).Scan(&b.CounterId)
	if err != nil {
		return err
	}
	return nil
}

func (b *Booking) GetBookingById(booking_id int) (Booking, error) {
	var booking Booking
	qStr, err := DB.Prepare((`SELECT counter_id, timestamp, card_uid, geraet_id, check_in_out, anwesenheit_typ FROM anwesenheit WHERE counter_id = $1`))
	if err != nil {
		return booking, err
	}
	// TODO: also get booking type name
	err = qStr.QueryRow(booking_id).Scan(&booking.CounterId, &booking.Timestamp, &booking.CardUID, &booking.GeraetID, &booking.CheckInOut, &booking.BookingType.Id)
	if err != nil {
		return booking, err
	}
	return booking, nil
}

// Gets all booking based on a card uid
//
// optional filter parameter
func (b *Booking) GetBookingsByCardID(card_uid string, tsFrom time.Time, tsTo time.Time) ([]Booking, error) {
	qStr, err := DB.Prepare((`SELECT counter_id, timestamp, card_uid, geraet_id, check_in_out FROM anwesenheit WHERE card_uid = $1 AND timestamp BETWEEN $2 AND $3 ORDER BY timestamp`))
	if err != nil {
		return nil, err
	}
	defer qStr.Close()
	var bookings []Booking
	rows, err := qStr.Query(card_uid, tsFrom, tsTo)
	if err == sql.ErrNoRows {
		return bookings, err
	}
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	for rows.Next() {
		var booking Booking
		if err := rows.Scan(&booking.CounterId, &booking.Timestamp, &booking.CardUID, &booking.GeraetID, &booking.CheckInOut); err != nil {
			return bookings, err
		}
		bookings = append(bookings, booking)
	}
	if err = rows.Err(); err != nil {
		return bookings, err
	}
	return bookings, nil
}

func (b Booking) Save() {
	qStr, err := DB.Prepare((`UPDATE "anwesenheit" SET "card_uid" = $2, "geraet_id" = $3, "check_in_out" = $4, "timestamp" = $5 WHERE "counter_id" = $1;`))
	if err != nil {
		log.Fatalf("Error preparing query: %v", err)
		return
	}

	_, err = qStr.Query(b.CounterId, b.CardUID, b.GeraetID, b.CheckInOut, b.Timestamp)
	if err != nil {
		log.Fatalf("Error executing query: %v", err)
		return
	}
}

func (b *Booking) GetBookingType() string {
	debug := (helper.GetEnv("GO_ENV", "production") == "debug")
	switch b.CheckInOut {
	case 1: //manuelle Änderung
		return "kommen"
	case 3:
		if debug {
			return "kommen manuell"
		}
		return "kommen"
	case 2: //manuelle Änderung
		return "gehen"
	case 4:
		if debug {
			return "gehen manuell"
		}
		return "gehen"
	case 254:
		return "abgemeldet"
	default:
		return "Buchungs Typ unbekannt"
	}
}

func (b *Booking) Update(nb Booking) {
	auditLog, closeLog := logs.NewAudit()
	defer closeLog()
	if b.CheckInOut != nb.CheckInOut && nb.CheckInOut != 0 {
		b.CheckInOut = nb.CheckInOut
	}
	if b.CardUID != nb.CardUID && nb.CardUID != "" {
		b.CardUID = nb.CardUID
	}
	if b.GeraetID != nb.GeraetID && nb.GeraetID != 0 {
		b.GeraetID = nb.GeraetID
	}
	if b.Timestamp != nb.Timestamp {
		auditLog.Printf("Änderung in Buchung %d von '%s': Buchungszeit (%s -> %s).", b.CounterId, b.CardUID, b.Timestamp.Format("15:04"), nb.Timestamp.Format("15:04)"))
		b.Timestamp = nb.Timestamp
	}
}

func checkLastBooking(b Booking) bool {
	var check_in_out int
	stmt, err := DB.Prepare((`SELECT check_in_out FROM "anwesenheit" WHERE "card_uid" = $1 ORDER BY "timestamp" DESC LIMIT 1;`))
	if err != nil {
		log.Fatalf("Error preparing query: %v", err)
		return false
	}
	err = stmt.QueryRow(b.CardUID).Scan(&check_in_out)
	if err == sql.ErrNoRows {
		return true
	}
	if err != nil {
		log.Println("Error checking last booking: ", err)
		return false
	}
	if int16(check_in_out)%2 == b.CheckInOut%2 {
		return false
	}
	return true
}

func (b *Booking) UpdateTime(newTime time.Time) {
	hour, minute, _ := newTime.Clock()
	if hour == b.Timestamp.Hour() && minute == b.Timestamp.Minute() {
		return
	}
	// TODO: add check for time overlap

	var newBooking Booking
	newBooking.Timestamp = time.Date(b.Timestamp.Year(), b.Timestamp.Month(), b.Timestamp.Day(), hour, minute, 0, 0, b.Timestamp.Location())
	if b.CheckInOut < 3 {
		newBooking.CheckInOut = b.CheckInOut + 2
	}
	if b.CheckInOut == 254 {
		newBooking.CheckInOut = 4
	}
	b.Update(newBooking)
	// TODO Check verify
	if b.Verify() {
		b.Save()
	} else {
		log.Println("Cannot save updated booking!", b.ToString())
	}
	// b.Verify()
	// b.Save()
}

func (b *Booking) ToString() string {
	return fmt.Sprintf("Booking %d: at: %s, CheckInOut: %d, TypeId: %d", b.CounterId, b.Timestamp.Format("15:04"), b.CheckInOut, b.BookingType.Id)
}

func GetBookingTypes() ([]BookingType, error) {
	var types []BookingType
	qStr, err := DB.Prepare("SELECT anwesenheit_id, anwesenheit_name FROM s_anwesenheit_typen;")
	if err != nil {
		return types, err
	}
	defer qStr.Close()
	rows, err := qStr.Query()
	if err != nil {
		log.Println("Error getting anwesenheit rows!", err)
		return types, err
	}
	defer rows.Close()
	for rows.Next() {
		var bookingType BookingType
		if err := rows.Scan(&bookingType.Id, &bookingType.Name); err != nil {
			log.Println("Error scanning row!", err)
		}
		types = append(types, bookingType)
	}
	return types, nil
}

func GetBookingTypeById(bookingTypeId int8) (BookingType, error) {
	var bookingType BookingType = BookingType{Id: bookingTypeId}

	qStr, err := DB.Prepare("SELECT anwesenheit_name FROM s_anwesenheit_typen WHERE anwesenheit_id = $1;")
	if err != nil {
		return bookingType, err
	}
	defer qStr.Close()
	err = qStr.QueryRow(bookingTypeId).Scan(&bookingType.Name)
	if err != nil {
		return bookingType, err
	}
	return bookingType, nil
}

func GetBookingTypesCached() []BookingType {
	types, err := definedTypes.Get("s_anwesenheit_typen")
	if err != nil {
		return []BookingType{}
	}
	return types.([]BookingType)
}