// API doc: https://wiki.summercamp.local/display/PIN/Pinguin+server+API
package main

import (
	"encoding/json"
	"battlecamp-go-server/games"
	"log"
	"net/http"
	"runtime"
	"strconv"

	"github.com/julienschmidt/httprouter"
)

var currentGames games.Games = games.New()

func main() {
	runtime.GOMAXPROCS(runtime.NumCPU())

	router := httprouter.New()
	router.GET("/", showIndex)
	router.GET("/games", listGames)
	router.PUT("/games", createGame)
	router.PUT("/games/:rows/:cols", createGame)
	router.GET("/games/:gameid", showGame)
	router.GET("/games/:gameid/:boardid", proxyHandler)
	//router.GET("/games/:gameid/players", playerListHandler)
	// TODO: /games/{id}/players/{playerId}
	router.POST("/games/:gameid/move/:playerId/:direction", movePlayer)

	log.Fatal(http.ListenAndServe(":8080", router))
}

func showIndex(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
	w.Write([]byte("Go battlecamp!"))
}

func proxyHandler(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {

	if ps.ByName("gameid") == "board" {
		showBoard(w, r, ps)
	} else if ps.ByName("boardid") == "join" {
		joinGame(w, r, ps)
	} else {
		listPlayers(w, r, ps)
	}
}

func listGames(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
	w.Header().Set("Content-Type", "text/plain;charset=utf-8")
	e := json.NewEncoder(w)
	e.Encode(currentGames.ListGames())
}

func createGame(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
	xString := ps.ByName("x")
	yString := ps.ByName("y")
	var game *games.Game

	if xString != "" && yString != "" {
		x, _ := strconv.Atoi(xString)
		y, _ := strconv.Atoi(yString)
		game = games.NewGame(x, y)
	} else {
		game = games.NewGame(56, 35)
	}

	currentGames.AddGame(game)
	w.WriteHeader(http.StatusCreated)
}

func joinGame(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
	http.Error(w, "joinGame not implemented", http.StatusNotImplemented)
}

func showGame(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {

	w.Header().Set("Content-Type", "text/plain;charset=utf-8")

	http.Error(w, "showGame not implemented", http.StatusNotImplemented)
}

func listPlayers(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
	http.Error(w, "listPlayers not implemented", http.StatusNotImplemented)
}

func movePlayer(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
	http.Error(w, "movePlayer not implemented", http.StatusNotImplemented)
}

// Request params: x={x}&y={y}&rows={rows}&cols={cols}
func showBoard(w http.ResponseWriter, req *http.Request, ps httprouter.Params) {
	//x, _ := strconv.Atoi(req.FormValue("x"))
	//y, _ := strconv.Atoi(req.FormValue("y"))
	//rows, _ := strconv.Atoi(req.FormValue("rows"))
	//cols, _ := strconv.Atoi(req.FormValue("cols"))
}