package main

import (
	"context"
	"fmt"
	"log"
	"net/http"
	"os"
	"slices"

	"github.com/jackc/pgx/v5/pgxpool"

	"git.huntm.net/wedding/server/admin"
	"git.huntm.net/wedding/server/guest"
)

var (
	user     = os.Getenv("USER")
	password = os.Getenv("PASS")
	host     = "localhost"
	port     = "5432"
	database = "postgres"
)

func main() {
	databasePool, err := pgxpool.New(context.Background(),
		fmt.Sprintf("postgres://%s:%s@%s:%s/%s", user, password, host, port, database))
	if err != nil {
		log.Fatal(err)
	}
	defer databasePool.Close()

	guestStore := guest.NewStore(databasePool)
	guestHandler := guest.NewGuestHandler(guestStore)
	adminStore := admin.NewStore(databasePool)
	adminHandler := admin.NewAdminHandler(adminStore, guestStore)

	mux := http.NewServeMux()
	mux.Handle("/api/guests/", guestHandler)
	mux.Handle("/api/admin/", adminHandler)
	log.Fatal(http.ListenAndServe(":8080", serveHTTP(mux)))
}

func serveHTTP(handler http.Handler) http.Handler {
	return http.HandlerFunc(func(responseWriter http.ResponseWriter,
		request *http.Request) {
		writeMethods(responseWriter, request)
		writeOrigins(responseWriter, request)
		writeHeaders(responseWriter)
		handler.ServeHTTP(responseWriter, request)
	})
}

func writeMethods(responseWriter http.ResponseWriter, request *http.Request) {
	allowedMethods := []string{"OPTIONS", "POST", "PUT"}
	method := request.Header.Get("Access-Control-Request-Method")
	if isPreflight(request) && slices.Contains(allowedMethods, method) {
		responseWriter.Header().Add("Access-Control-Allow-Methods", method)
	}
}

func writeOrigins(responseWriter http.ResponseWriter, request *http.Request) {
	allowedOrigins := []string{"http://localhost:5173", "http://192.168.1.18:5173"}
	origin := request.Header.Get("Origin")
	if slices.Contains(allowedOrigins, origin) {
		responseWriter.Header().Add("Access-Control-Allow-Origin", origin)
	}
}

func writeHeaders(responseWriter http.ResponseWriter) {
	responseWriter.Header().Add("Access-Control-Allow-Headers", "*")
}

func isPreflight(request *http.Request) bool {
	return request.Method == "OPTIONS" &&
		request.Header.Get("Origin") != "" &&
		request.Header.Get("Access-Control-Request-Method") != ""
}