package main

import (
	"embed"
	"encoding/json"
	"log"
	"net/http"
	"os"

	"github.com/gorilla/mux"
)

//go:embed *.js
//go:embed *.html
var content embed.FS

func handleEntryOptions(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Access-Control-Allow-Origin", "*")
	w.Header().Set("Access-Control-Allow-Methods", "POST, OPTIONS")
	w.Header().Set("Access-Control-Allow-Headers", "Content-Type")
	w.WriteHeader(http.StatusNoContent)
}

func handleEntryPost(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Access-Control-Allow-Origin", "*")
	w.Header().Set("Access-Control-Allow-Methods", "POST, OPTIONS")
	w.Header().Set("Access-Control-Allow-Headers", "Content-Type")
	var entry Entry
	err := json.NewDecoder(r.Body).Decode(&entry)
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}
	err = InsertEntry(&entry)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	log.Println("New entry for", entry.Location)
}

func handleRequests() {
	router := mux.NewRouter()
	router.HandleFunc("/entry", handleEntryPost).Methods("POST")
	router.HandleFunc("/entry", handleEntryOptions).Methods("OPTIONS")
	router.PathPrefix("/").Handler(http.FileServer(http.FS(content)))
	log.Fatal(http.ListenAndServe(configure(), router))
}

func configure() string {
	at := os.Getenv("STATSAT")
	if at == "" {
		log.Println("Defaulting to STATSAT=:8080")
		at = ":8080"
	}
	return at
}

func main() {
	log.Println("Starting up")
	InitEntries()
	defer CloseEntries()
	handleRequests()
}