package endpoints

import (
	"arbeitszeitmessung/helper"
	"arbeitszeitmessung/models"
	"encoding/json"
	"log"
	"net/http"
	"strconv"
)

// Frontend relevant backend functionality -> not used by the arduino devices
func TimeHandler(w http.ResponseWriter, r *http.Request) {
	helper.SetCors(w)
	switch r.Method {
	case "GET":
		getBookings(w, r)
	case "UPDATE":
		updateBooking(w, r)
	case "OPTIONS":
		// just support options header for non GET Requests from SWAGGER
		w.WriteHeader(http.StatusOK)
	default:
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
	}
}


// Returns bookings from DB with similar card uid -> checks for card uid in http query params
func getBookings(w http.ResponseWriter, r *http.Request) {
	card_uid := r.URL.Query().Get("card_uid")
	if card_uid == "" {
		http.Error(w, "Missing cardID query parameter", http.StatusBadRequest)
		return
	}
	bookings, err := (*models.Booking).GetBookingsByCardID(nil, card_uid)
	if err != nil {
		log.Println("Error getting bookings: ", err)
		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
		return
	}
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(bookings)
}

// Updates a booking form the given json body
func updateBooking(w http.ResponseWriter, r *http.Request) {
	_booking_id := r.URL.Query().Get("counter_id")
	if _booking_id == "" {
		http.Error(w, "Missing bookingID query parameter", http.StatusBadRequest)
		return
	}
	booking_id, err := strconv.Atoi(_booking_id)
	if err != nil {
		http.Error(w, "Invalid bookingID query parameter", http.StatusBadRequest)
		return
	}
	_booking, err := (*models.Booking).GetBookingById(nil, booking_id)
	if err != nil {
		log.Println("Error getting booking: ", err)
		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
		return
	}
	var booking models.Booking
	dec := json.NewDecoder(r.Body)
	dec.DisallowUnknownFields()
	err = dec.Decode(&booking)
	if err != nil {
		log.Println("Error parsing booking: ", err)
		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
		return
	}
	if booking.CounterId != 0 && booking.CounterId != _booking.CounterId {
		log.Println("Booking Ids do not match")
		http.Error(w, "Booking Ids do not match", http.StatusBadRequest)
		return
	}
	_booking.Update(booking)
	_booking.Save()
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(_booking)
}