package app

import (
	_ "embed"

	"github.com/veandco/go-sdl2/sdl"
	"github.com/veandco/go-sdl2/ttf"
)

//go:embed assets/Trueno-wml2.otf
var viewerFontData []byte

const textBoxPaddingX = 10
const textBoxPaddingY = 7

func renderText(text string) (*sdl.Surface, error) {
	rwData, err := sdl.RWFromMem(viewerFontData)
	if err != nil {
		return nil, err
	}
	defer rwData.Close()

	font, err := ttf.OpenFontRW(rwData, 0, 24)
	if err != nil {
		return nil, err
	}
	defer font.Close()

	color := sdl.Color{R: 0xff, G: 0xff, B: 0xff, A: 0xff}
	surface, err := font.RenderUTF8Blended(text, color)
	if err != nil {
		return nil, err
	}
	return surface, nil
}

// renderTextBox renders text inside a box
func renderTextBox(text string) (*sdl.Surface, error) {
	textSurface, err := renderText(text)
	if err != nil {
		return nil, err
	}
	defer textSurface.Free()

	// Create a new surface for the text box
	boxSurface, err := sdl.CreateRGBSurfaceWithFormat(0, textSurface.W+(textBoxPaddingX*2), textSurface.H+(textBoxPaddingY*2), 32, sdl.PIXELFORMAT_RGBA8888)
	if err != nil {
		return nil, err
	}

	// Draw a border around the text box
	boxBorderRect := &sdl.Rect{X: 0, Y: 0, W: boxSurface.W, H: boxSurface.H}
	if err := boxSurface.FillRect(boxBorderRect, 0xffffffff); err != nil {
		return nil, err
	}

	boxBgRect := &sdl.Rect{X: 1, Y: 1, W: boxSurface.W - 2, H: boxSurface.H - 2}
	if err := boxSurface.FillRect(boxBgRect, 0); err != nil {
		return nil, err
	}

	// Render the text surface on top of the box surface
	textRect := &sdl.Rect{X: textBoxPaddingX, Y: textBoxPaddingY, W: textSurface.W, H: textSurface.H}
	if err := textSurface.Blit(nil, boxSurface, textRect); err != nil {
		return nil, err
	}

	return boxSurface, nil
}

func (v *Viewer) RenderMessage(text string) error {
	var err error
	v.messageSurface, err = renderTextBox(text)
	v.messageTick = sdl.GetTicks64()
	return err
}