package main

// #cgo pkg-config: gtk+-2.0
import "C"

import (
	"fmt"
	"runtime"
	"time"

	"github.com/mattn/go-gtk/gdk"
	"github.com/mattn/go-gtk/glib"
	"github.com/mattn/go-gtk/gtk"
)

func screenSizeWithFallback() (int, int) {
	w, h := gdk.ScreenWidth(), gdk.ScreenHeight()
	if w <= 0 || h <= 0 {
		// Kindle Paperwhite 4 portrait as a safe fallback
		return 1072, 1448
	}
	return w, h
}

type App struct {
	battery      BatteryInfo
	batteryLabel *gtk.Label
}

type BatteryInfo struct {
	Percent  int
	Charging bool
	Path     string
}

func startMinuteClock(onTick func(now time.Time)) (stop func()) {
	quit := make(chan struct{})
	go func() {
		for {
			now := time.Now()
			next := now.Truncate(time.Minute).Add(time.Minute)
			wait := time.Until(next)
			select {
			case <-time.After(wait):
				n := time.Now()
				glib.IdleAdd(func() { onTick(n) })
			case <-quit:
				return
			}
		}
	}()
	return func() { close(quit) }
}

func main() {
	app := App{}
	runtime.LockOSThread()
	gtk.Init(nil)

	w, h := screenSizeWithFallback()
	fmt.Printf("Using screen size: %dx%d\n", w, h)

	win := gtk.NewWindow(gtk.WINDOW_TOPLEVEL)
	win.SetTitle("L:A_N:application_PC:TS_ID:com.lab126.store")
	win.SetDefaultSize(w, h)
	win.Connect("destroy", gtk.MainQuit)

	bg := gtk.NewEventBox()
	bg.ModifyBG(gtk.STATE_NORMAL, gdk.NewColor("#ffffff"))
	win.Add(bg)

	// main container
	root := gtk.NewVBox(false, 0)
	bg.Add(root)

	// top bar
	topBar := gtk.NewHBox(false, 8)
	topBar.SetBorderWidth(6)
	root.PackStart(topBar, false, false, 0)

	leftStatus := gtk.NewLabel("random info here")
	topBar.PackStart(leftStatus, false, false, 8)

	app.batteryLabel = gtk.NewLabel("Batt --%")
	netLabel := gtk.NewLabel("Wi-Fi")
	timeLabel := gtk.NewLabel(time.Now().Format("15:04"))

	topBar.PackEnd(timeLabel, false, false, 8)
	topBar.PackEnd(netLabel, false, false, 8)
	topBar.PackEnd(app.batteryLabel, false, false, 8)

	//Scrollable content
	scroll := gtk.NewScrolledWindow(nil, nil)
	scroll.SetShadowType(gtk.SHADOW_NONE)
	scroll.SetPolicy(gtk.POLICY_NEVER, gtk.POLICY_NEVER)
	scroll.ModifyBG(gtk.STATE_NORMAL, gdk.NewColor("#ffffff"))
	root.PackStart(scroll, true, true, 0)

	vp := gtk.NewViewport(nil, nil)
	vp.ModifyBG(gtk.STATE_NORMAL, gdk.NewColor("#ffffff"))
	scroll.Add(vp)

	content := gtk.NewVBox(false, 14)
	content.ModifyBG(gtk.STATE_NORMAL, gdk.NewColor("#ffffff"))
	vp.Add(content)

	title := gtk.NewLabel("")
	title.SetMarkup("<span size='20000' weight='bold'>some cool text</span>")
	content.PackStart(title, false, false, 0)

	body := gtk.NewLabel("aaaa")
	body.SetLineWrap(true)
	content.PackStart(body, false, false, 0)

	_ = startMinuteClock(func(now time.Time) {
		timeLabel.SetText(now.Format("15:04"))
	})
	initBattery(&app)

	win.ShowAll()
	gtk.Main()
}

func (a *App) updateBatteryLabel(b BatteryInfo) {
	txt := fmt.Sprintf("%d%%", b.Percent)
	fmt.Println("changed battery label")
	if b.Charging {
		txt += " (charging)"
	}
	a.batteryLabel.SetText(txt)
}