//! Colour bitmap glyphs (emoji): drawn as their images, which the type's fill doesn't paint.

use vectorcraft_color::{Color, Paint};
use vectorcraft_doc::text::{CharStyle, TextObject};
use vectorcraft_doc::{Node, NodeKind};
use vectorcraft_geom::Point;
use vectorcraft_text::test_fonts::{COLOUR_CHAR, COLOUR_LARGE, colour_bitmap_family, colour_bitmap_font};

use super::*;

/// 100 pt [`COLOUR_CHAR`] in the colour bitmap test font (`sbix` or `CBDT`), filled blue, its
/// baseline at (20, 120), on a white 160×160 page.
fn render(sbix: bool, opts: RenderOptions) -> Rendered {
    let _adding = crate::tests_fontchange::adding_fonts();
    vectorcraft_text::FontDb::global().add_font(colour_bitmap_font(sbix).unwrap());
    let mut d = Document::new(160.0, 160.0);
    let st = CharStyle {
        font_family: colour_bitmap_family(sbix).into(),
        size: 100.0,
        fill: Paint::solid(Color::rgb(0.0, 0.0, 1.0)),
        ..Default::default()
    };
    let n = Node::new(d.alloc_id(), NodeKind::Text(Box::new(TextObject::point(Point::new(20.0, 120.0), &COLOUR_CHAR.to_string(), st))));
    let l = d.layers[0].id;
    d.insert(Some(l), 0, n).unwrap();
    Renderer::new().render(&d, 160, 160, Affine::IDENTITY, &RenderOptions { background: Some([255, 255, 255, 255]), ..opts })
}

#[test]
fn a_bitmap_glyph_draws_its_largest_strike_not_the_fill() {
    for sbix in [true, false] {
        let img = render(sbix, RenderOptions::default());
        // Inside the em square the image covers (the CBDT one from 75 above the baseline to 25
        // below, the sbix one from 87.2 above to 12.8 below), away from its edges.
        assert_eq!(img.pixel(70, 80), COLOUR_LARGE, "sbix {sbix}");
        let blue = (0..160).flat_map(|y| (0..160).map(move |x| (x, y))).any(|(x, y)| img.pixel(x, y)[2] > 200 && img.pixel(x, y)[0] < 50);
        assert!(!blue, "the fill doesn't paint the glyph (sbix {sbix})");
    }
}

#[test]
fn outline_mode_draws_a_bitmap_glyph_as_its_box() {
    let img = render(false, RenderOptions { outline: true, ..Default::default() });
    assert_eq!(img.pixel(70, 80), [255, 255, 255, 255], "no pixels inside");
    // The box's left edge at x 32.5 (the bearing of 2 px of 6.25 pt), from y 45 to 145.
    assert!((31..=34).any(|x| img.pixel(x, 100)[0] < 128), "the box's edge shows");
}