package gui

import (
	"image"
	"math"

	"github.com/hajimehoshi/ebiten/v2"
)

// Layout provides the terminal gui size in pixels. Required to implement the ebiten interface.
func (g *GUI) Layout(outsideWidth, outsideHeight int) (int, int) {
	panic("should not call this")
}

// Layout provides the terminal gui size in pixels. Required to implement the ebiten interface.
func (g *GUI) LayoutF(outsideWidth, outsideHeight float64) (float64, float64) {
	scale := ebiten.Monitor().DeviceScaleFactor()
	sw, sh := math.Ceil(scale*outsideWidth), math.Ceil(scale*outsideHeight)
	w, h := int(sw), int(sh)

	if g.size.X != w || g.size.Y != h {
		g.size = image.Point{
			X: int(w),
			Y: h,
		}
		g.resize(w, h)
	}

	return sw, sh
}

func (g *GUI) resize(w, h int) {

	if g.fontManager.CharSize().X == 0 || g.fontManager.CharSize().Y == 0 || g.terminal == nil {
		return
	}

	cols := uint16(w / g.fontManager.CharSize().X)
	rows := uint16(h / g.fontManager.CharSize().Y)

	g.terminal.Lock()
	defer g.terminal.Unlock()

	if g.terminal.IsRunning() {
		g.log.Info("terminal resizing", "w", w, "h", h, "rows", rows, "cols", cols)
		_ = g.terminal.SetSize(rows, cols)
	}
}