use nox_gfx::canvas::Canvas;
use nox_gfx::color::hex;
use nox_text::{draw_text, measure, shape, Font, GlyphCache, TextStyle};
use std::time::Instant;

const LINE: &str = "Handgloves Roblox 0123 the quick brown fox jumps over the lazy dog";

fn main() {
    let b = std::fs::read("/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf").unwrap();
    let font = Font::parse(&b).unwrap();
    let mut c = Canvas::new(1200, 800);
    let st = TextStyle::new(14.0);

    let mut cache = GlyphCache::new();
    let t0 = Instant::now();
    let mut y = 14.0;
    for _ in 0..50 {
        draw_text(&mut c, &mut cache, &font, LINE, 10.0, y, st, hex(0xffffff));
        y += 15.0;
        if y > 790.0 { y = 14.0; }
    }
    println!("cold cache, 50 lines: {:?} ({} glyphs cached)", t0.elapsed(), cache.len());

    let n = 200;
    let t0 = Instant::now();
    for i in 0..n {
        let mut y = 14.0;
        for _ in 0..50 {
            draw_text(&mut c, &mut cache, &font, LINE, 10.0 + (i % 3) as f32 * 0.25, y, st, hex(0xffffff));
            y += 15.0;
            if y > 790.0 { y = 14.0; }
        }
    }
    let el = t0.elapsed();
    let glyphs = LINE.chars().count() * 50 * n;
    println!(
        "warm: {:.3} ms per 50-line page  ({:.1} ns/glyph, {} glyphs total)",
        el.as_secs_f64() * 1000.0 / n as f64,
        el.as_nanos() as f64 / glyphs as f64,
        glyphs
    );

    let t0 = Instant::now();
    for _ in 0..2000 { let _ = shape(&font, LINE, st); }
    println!("shape only: {:.1} us/line", t0.elapsed().as_secs_f64() * 1e6 / 2000.0);
    let t0 = Instant::now();
    for _ in 0..2000 { let _ = measure(&font, LINE, st); }
    println!("measure only: {:.1} us/line", t0.elapsed().as_secs_f64() * 1e6 / 2000.0);
}