//! The code font advances every character by the same amount (to the pixel grid): no ligature or pair
//! kerning opens a gap inside a URL or an operator.

use egui::{Color32, Context, FontId, RawInput};

/// x of every glyph of `text` laid out in the monospace family, plus the end of the row.
fn xs(ctx: &Context, text: &str) -> Vec<f32> {
    ctx.fonts_mut(|fonts| {
        let galley = fonts.layout_no_wrap(text.to_owned(), FontId::monospace(14.0), Color32::WHITE);
        let row = &galley.rows[0];
        row.glyphs.iter().map(|g| g.pos.x).chain(std::iter::once(row.size.x)).collect()
    })
}

#[test]
fn urls_and_operators_keep_one_advance_per_character() {
    let ctx = Context::default();
    notescraft_ui_egui::fonts::install(&ctx);
    ctx.run_ui(RawInput::default(), |_| {}).textures_delta.clear();
    for text in ["https://publish.obsidian.md/username/about", "a != b -> c => d // e <!-- f -->"] {
        let xs = xs(&ctx, text);
        let steps: Vec<f32> = xs.windows(2).map(|w| w[1] - w[0]).collect();
        let first = steps[0];
        assert!(steps.iter().all(|s| (s - first).abs() <= 1.0), "{text}: uneven advances {steps:?}");
    }
}