//! The shared dialog frame at every UI scale (Preferences → User Interface → UI Scaling zooms the
//! whole interface, so a window holds fewer points).

use serde_json::json;
use vectorcraft_engine::Session;

use super::*;
use crate::theme;

/// The save prompt's rect after a few frames in a window of `physical` pixels at UI scale `zoom`.
fn prompt(app: &mut VectorcraftApp, ctx: &egui::Context, physical: egui::Vec2, zoom: f32) -> (egui::Rect, egui::Rect) {
    ctx.set_zoom_factor(zoom);
    let screen = egui::Rect::from_min_size(egui::Pos2::ZERO, physical / zoom);
    for _ in 0..10 {
        let input = egui::RawInput { screen_rect: Some(screen), ..Default::default() };
        ctx.run_ui(input, |ui| show(app, ui.ctx())).textures_delta.clear();
    }
    let rect = ctx.memory(|m| m.area_rect(egui::Id::unique(("dialog", crate::unsaved::KIND)))).unwrap();
    (rect, screen)
}

#[test]
fn the_save_prompt_fits_its_content_and_the_window_at_every_ui_scale() {
    let mut app = VectorcraftApp::new(Session::new(), Default::default());
    app.run("file.new", json!({"width": 200, "height": 200})).unwrap();
    let ctx = egui::Context::default();
    theme::install_fonts(&ctx);
    theme::apply(&ctx, Default::default());
    for name in ["Untitled-1", "Quarterly campaign poster, final revision with the printer's notes"] {
        app.ui.dialog = Some(Dialog::new(crate::unsaved::KIND, json!({"index": 0, "name": name, "then": "close"})));
        // Scaled up and down while the prompt is open, in a full-size and in the smallest window.
        for (w, h, zoom) in
            [(1440.0, 900.0, 1.0), (1440.0, 900.0, 2.0), (1440.0, 900.0, 1.5), (800.0, 500.0, 2.0), (800.0, 500.0, 1.0), (1440.0, 900.0, 0.75)]
        {
            let (rect, screen) = prompt(&mut app, &ctx, egui::vec2(w, h), zoom);
            let at = format!("{name}: {w} × {h} px at {zoom}×: {rect:?} in {screen:?}");
            assert!(screen.contains_rect(rect), "inside the window, {at}");
            // As tall as its text and buttons (no empty band around the buttons).
            assert!(rect.height() < 200.0, "{at}");
        }
    }
}