/*
	Copyright (C) 2024  Pagefault Games

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU Affero General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU Affero General Public License for more details.

	You should have received a copy of the GNU Affero General Public License
	along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

package main

import (
	"encoding/gob"
	"flag"
	"log"
	"net"
	"net/http"
	"os"
	"strconv"

	"github.com/pagefaultgames/rogueserver/api"
	"github.com/pagefaultgames/rogueserver/db"
)

func main() {
	// flag stuff
	debug, errDebugBoolParse := strconv.ParseBool(os.Getenv("debug"))
	if errDebugBoolParse != nil {
		log.Fatalf("failed to parse debug value: %s", errDebugBoolParse)
	}
	proto := "tcp"
	addr := "0.0.0.0:8001"

	dbuser := os.Getenv("dbuser")
	dbpass := os.Getenv("dbpass")
	dbproto := "tcp"
	dbaddr := os.Getenv("dbaddr")
	dbname := os.Getenv("dbname")

	flag.Parse()

	// register gob types
	gob.Register([]interface{}{})
	gob.Register(map[string]interface{}{})

	// get database connection
	err := db.Init(dbuser, dbpass, dbproto, dbaddr, dbname)
	if err != nil {
		log.Fatalf("failed to initialize database: %s", err)
	}

	// create listener
	listener, err := createListener(proto, addr)
	if err != nil {
		log.Fatalf("failed to create net listener: %s", err)
	}

	mux := http.NewServeMux()

	// init api
	if err := api.Init(mux); err != nil {
		log.Fatal(err)
	}

	// start web server

	handler := prodHandler(mux)
	if debug {
		handler = debugHandler(mux)
	} else {
		err = http.Serve(listener, handler)
	}
	if err != nil {
		log.Fatalf("failed to create http server or server errored: %s", err)
	}
}

func createListener(proto, addr string) (net.Listener, error) {
	if proto == "unix" {
		os.Remove(addr)
	}

	listener, err := net.Listen(proto, addr)
	if err != nil {
		return nil, err
	}

	if proto == "unix" {
		if err := os.Chmod(addr, 0777); err != nil {
			listener.Close()
			return nil, err
		}
	}

	return listener, nil
}

func prodHandler(router *http.ServeMux) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Access-Control-Allow-Headers", "Authorization, Content-Type")
		w.Header().Set("Access-Control-Allow-Methods", "OPTIONS, GET, POST")
		w.Header().Set("Access-Control-Allow-Origin", "https://pokerogue.net")

		if r.Method == "OPTIONS" {
			w.WriteHeader(http.StatusOK)
			return
		}

		router.ServeHTTP(w, r)
	})
}

func debugHandler(router *http.ServeMux) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Access-Control-Allow-Headers", "*")
		w.Header().Set("Access-Control-Allow-Methods", "*")
		w.Header().Set("Access-Control-Allow-Origin", "*")

		if r.Method == "OPTIONS" {
			w.WriteHeader(http.StatusOK)
			return
		}

		router.ServeHTTP(w, r)
	})
}