// text: prove the font layer draws glyphs on the raw screen.
package main

import (
	"fmt"
	"os"
	"time"

	"9front/gui/draw"
)

const fontpath = "/lib/font/bit/lucidasans/unicode.8.font"

func main() {
	if err := run(); err != nil {
		fmt.Fprintf(os.Stderr, "text: %v\n", err)
		os.Exit(1)
	}
}

func run() error {
	d, err := draw.Init("/dev")
	if err != nil {
		return err
	}
	defer d.Close()
	scr := d.Screen
	r := scr.Rect()

	f, err := d.OpenFont(fontpath)
	if err != nil {
		return err
	}
	fmt.Fprintf(os.Stderr, "text: font h=%d ascent=%d\n", f.Height, f.Ascent)

	// acme's palette: a 25% mix over white, per allocimagemix.
	bg, err := d.Color(0xFFFFEAFF)
	if err != nil {
		return err
	}
	ink, err := d.Color(0x000000FF)
	if err != nil {
		return err
	}
	rule, err := d.Color(0x99994CFF)
	if err != nil {
		return err
	}

	draw.Draw(scr, r, bg, nil, draw.ZP)
	y := r.Min.Y + 20
	for _, s := range []string{
		"Go on Plan 9: glyphs from /lib/font/bit, no libdraw.",
		"ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz",
		"0123456789  !@#$%^&*()-=[]{};'\\:\"|,./<>?",
		"width(\"hello\") = " + fmt.Sprint(f.Width("hello")) + " px",
		time.Now().Format("Mon 2 Jan 2006 15:04:05"),
	} {
		f.String(scr, draw.Point{X: r.Min.X + 20, Y: y}, ink, s)
		y += int32(f.Height) + 6
	}
	draw.Draw(scr, draw.Rect(r.Min.X+20, y+8, r.Min.X+520, y+9), rule, nil, draw.ZP)
	d.Flush()
	time.Sleep(90 * time.Second)
	return nil
}