// Command mpckit is the desktop kit editor for the MPC Sample.
package main

import (
	"embed"
	"log"

	"github.com/wailsapp/wails/v3/pkg/application"
	"github.com/wailsapp/wails/v3/pkg/events"

	"git.monoexp.com/bajdev/mpckit/internal/app"
)

// The built Svelte app (frontend/dist), embedded in the binary.
//
//go:embed all:frontend/dist
var assets embed.FS

// Window sizes are in device-independent pixels, 16:9 like most displays.
const (
	maxWidth, maxHeight = 1280, 720 // largest default size
	minWidth, minHeight = 960, 540  // smallest the layout is designed for
	screenShare         = 0.9       // default size: this share of the screen's work area
)

func main() {
	a := application.New(application.Options{
		Name:        "mpckit",
		Description: "Desktop kit editor for the MPC Sample",
		Services: []application.Service{
			application.NewService(app.NewService()),
		},
		Assets: application.AssetOptions{
			Handler: application.AssetFileServerFS(assets),
		},
		Mac: application.MacOptions{
			ApplicationShouldTerminateAfterLastWindowClosed: true,
		},
	})

	// Start hidden and size the window once the screens are known, so it
	// fits the display instead of being clamped by it.
	w := a.Window.NewWithOptions(application.WebviewWindowOptions{
		Title:            "mpckit",
		Width:            maxWidth,
		Height:           maxHeight,
		MinWidth:         minWidth,
		MinHeight:        minHeight,
		Hidden:           true,
		BackgroundColour: application.NewRGB(0x15, 0x17, 0x1A),
		URL:              "/",
	})

	a.Event.OnApplicationEvent(events.Common.ApplicationStarted, func(*application.ApplicationEvent) {
		if s := a.Screen.GetPrimary(); s != nil {
			width, height := fitSize(s.WorkArea.Width, s.WorkArea.Height)
			w.SetSize(width, height)
		}
		w.Center()
		w.Show()
	})

	if err := a.Run(); err != nil {
		log.Fatal(err)
	}
}

// fitSize returns a 16:9 window size that takes screenShare of the work
// area (areaW x areaH), capped at maxWidth x maxHeight and no smaller than
// minWidth x minHeight.
func fitSize(areaW, areaH int) (int, int) {
	width := min(maxWidth, int(float64(areaW)*screenShare))
	height := width * 9 / 16
	if limit := int(float64(areaH) * screenShare); height > limit {
		height = limit
		width = height * 16 / 9
	}
	return max(width, minWidth), max(height, minHeight)
}