package main

import (
	"arbeitszeitmessung/models"
	"database/sql"
	"encoding/json"
	"errors"
	"fmt"
	"log"
	"net/http"
	"os"

	_ "github.com/lib/pq"
)

var DB *sql.DB

func main() {
	var err error
	DB, err = OpenDatabase()
	if err != nil {
		log.Fatal(err)
	}
	defer DB.Close()

	http.HandleFunc("/time", timeHandler)

	fmt.Println("Server is running at http://localhost:8080")
	log.Fatal(http.ListenAndServe(":8080", nil))
}

func timeHandler(w http.ResponseWriter, r *http.Request) {
	switch r.Method {
	case "PUT":
		createBooking(w, r)
	case "GET":
		getBookings(w, r)
	default:
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
	}
}

func createBooking(w http.ResponseWriter, r *http.Request) {
	booking := (*models.Booking).FromUrlParams(nil, r.URL.Query())
	if booking.Verify() {
		err := booking.Insert(DB)
		if errors.Is(models.SameBookingError{}, err) {
			http.Error(w, "Booking already exists", http.StatusConflict)
			return
		}
		if err != nil {
			log.Println("Error inserting booking: ", err)
			http.Error(w, "Internal Server Error", http.StatusInternalServerError)
			return
		}
		w.WriteHeader(http.StatusAccepted)
		json.NewEncoder(w).Encode(booking)
	}
	w.WriteHeader(http.StatusBadRequest)
}

func getBookings(w http.ResponseWriter, r *http.Request) {
	card_id := r.URL.Query().Get("cardID")
	bookings, err := GetBookingsByCardID(DB, card_id)
	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)

}

// func getBooking(w http.ResponseWriter, r *http.Request)

func getEnv(key, fallback string) string {
	if value, ok := os.LookupEnv(key); ok {
		return value
	}
	return fallback
}