package main

import (
	"os"
	"time"

	"github.com/nsf/termbox-go"
	//"syscall"
)

const programName = "gopher-battle"

var debugMode bool
var debugText string
var gameMode int

// ScreenWidth is how wide the Actual screen is
var ScreenWidth int

// ScreenHeight is how tall the Actual screen is
var ScreenHeight int

func main() {
	debugMode = true
	var err error

	err = termbox.Init()
	if err != nil {
		panic(err)
	}
	defer termbox.Close()

	style := defaultStyle()
	termbox.SetOutputMode(termbox.Output256)
	ScreenWidth, ScreenHeight = termbox.Size()
	mainLoop(style)
}

func readUserInput(e chan termbox.Event) {
	for {
		e <- termbox.PollEvent()
	}
}

func sendNoneEvent(e chan termbox.Event) {
	for {
		time.Sleep(time.Second / 32)
		e <- termbox.Event{Type: termbox.EventNone}
	}
}

// GameState is that.
type GameState struct {
	helpText string
}

var state *GameState

func mainLoop(style style) {
	// Initialize the Game
	if state == nil {
		state = new(GameState)
	}
	screens := defaultScreens()
	displayScreen := screens[titleScreenIndex]
	layoutAndDrawScreen(displayScreen, style)
	eventchan := make(chan termbox.Event)
	go readUserInput(eventchan)
	go sendNoneEvent(eventchan)

	//var fps, fpsTrack, trackTime int
	for {
		// Read User Input
		event := <-eventchan // := termbox.PollEvent()
		/*
			if getNowTime()-trackTime >= int(time.Second) {
				fps = fpsTrack
				fpsTrack = 0
				trackTime = getNowTime()
			}
			fpsTrack++
		*/
		var newScreenIndex int
		if event.Type == termbox.EventKey {
			if event.Key == termbox.KeyCtrlC {
				break
			}
			newScreenIndex = displayScreen.handleKeyPress(event)
			if newScreenIndex < len(screens) {
				displayScreen = screens[newScreenIndex]
			} else if newScreenIndex == exitScreenIndex {
				break
			}
			gameMode = newScreenIndex
		}
		// Update Game State
		if gameMode == mainScreenIndex {
			// In game updates
			displayScreen.update()
		}
		// Draw Screen
		layoutAndDrawScreen(displayScreen, style)
		//debugText = fmt.Sprintf("FPS: %d", fps)
	}
}

// Screens Setup
const (
	titleScreenIndex = iota
	mainScreenIndex
	exitScreenIndex
)

func defaultScreens() []Screen {
	//var view_port ViewPort
	titleScreen := titleScreen{}
	mainScreen := mainScreen{}
	screens := [...]Screen{
		&titleScreen,
		&mainScreen,
	}
	return screens[:]
}

// WriteToLog Writes to the Log
func WriteToLog(d string) {
	f, err := os.OpenFile(programName+".log", os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0664)
	if err != nil {
		panic(err)
	}
	f.WriteString(d)
	f.Close()
}