package main

import "os"
import "fmt"
import "image"
import _ "image/png"
import "git.tebibyte.media/sashakoshka/stone"
import _ "git.tebibyte.media/sashakoshka/stone/backends/x"

var application = &stone.Application { }
var caretX = 0
var caretY = 2
var page = 1

func main () {
	application.SetTitle("hellorld")
	application.SetSize(32, 28)

	iconFile16, err := os.Open("assets/scaffold16.png")
	if err != nil { panic(err) }
	icon16, _, err := image.Decode(iconFile16)
	if err != nil { panic(err) }
	iconFile16.Close()
	iconFile32, err := os.Open("assets/scaffold32.png")
	if err != nil { panic(err) }
	icon32, _, err := image.Decode(iconFile32)
	if err != nil { panic(err) }
	iconFile16.Close()
	
	application.SetIcon([]image.Image { icon16, icon32 })
	application.OnStart(redraw)
	application.OnPress(onPress)
	application.OnResize(redraw)
	
	err = application.Run()
	if err != nil { panic(err) }
	
	application.Draw()
}

func redraw () {
	application.Clear()
	_, height := application.Size()
	application.SetDot(0, 0)
	fmt.Fprint(application, "type some text below:")
	caretX = 0
	caretY = 2
	application.SetDot(0, height - 1)
	fmt.Fprintf(application, "page %d", page)
	drawCaret()
}

func drawCaret () {
	application.SetRune(caretX, caretY, '+')
	application.SetColor(caretX, caretY, stone.ColorDim)
}

func onPress (button stone.Button, modifiers stone.Modifiers) {
	width, height := application.Size()
	
	if button == stone.KeyEnter {
		application.SetRune(caretX, caretY, 0)
		caretX = 0
		caretY ++
			
	} else if button.Printable() {
		application.SetRune(caretX, caretY, rune(button))
		application.SetColor(caretX, caretY, stone.ColorForeground)
		caretX ++
		
		if caretX >= width {
			caretX = 0
			caretY ++
		}
	}

	if caretY >= height - 2 {
		page ++
		redraw()
	}
		
	drawCaret()
	application.Draw()
}