//! A renderer made without an engine session makes envelopes measure type by its glyph outlines.
//! One test in its own process, so nothing else has registered the measure before the renderer is
//! made.
// Integration tests: unwrapping and panicking on failure is fine here, unlike in shipped code (AGENTS.md › Robustness).
#![allow(clippy::unwrap_used, clippy::expect_used, clippy::panic)]

use std::sync::Arc;

use vectorcraft_doc::{CharStyle, Node, NodeId, NodeKind, TextObject};
use vectorcraft_geom::{Point, Rect, Shape};
use vectorcraft_text::test_fonts::{HEIGHT_FAMILY, height_font};

/// The largest distance between the edges of `a` and `b`.
fn off(a: Rect, b: Rect) -> f64 {
    [a.x0 - b.x0, a.y0 - b.y0, a.x1 - b.x1, a.y1 - b.y1].iter().fold(0.0f64, |m, v| m.max(v.abs()))
}

/// "Type" at 48 pt in a face the test adds, so its glyphs draw on a machine without craft-fonts or
/// system fonts.
fn type_in_test_face() -> TextObject {
    assert!(vectorcraft_text::FontDb::global().add_font(height_font(true).unwrap()) > 0, "the test face loads");
    TextObject::point(Point::new(10.0, 60.0), "Type", CharStyle { font_family: HEIGHT_FAMILY.into(), size: 48.0, ..Default::default() })
}

/// The box of the outlines `t`'s glyphs draw, in document space, measured glyph by glyph.
fn outline_box(t: &TextObject) -> Rect {
    let laid = vectorcraft_text::layout(vectorcraft_text::FontDb::global(), t);
    let outlines: Vec<Rect> = laid.glyphs.iter().filter(|g| !g.outline.elements().is_empty()).map(|g| (t.xf * &g.outline).bounding_box()).collect();
    assert_eq!(outlines.len(), 4, "every glyph of \"Type\" draws an outline");
    outlines.into_iter().reduce(|a, b| a.union(b)).unwrap()
}

#[test]
fn a_new_renderer_measures_type_in_envelopes_by_its_glyphs() {
    let t = type_in_test_face();
    let n = Arc::new(Node::new(NodeId(1), NodeKind::Text(Box::new(t.clone()))));
    let laid = n.geometric_bounds().unwrap();
    let ink = outline_box(&t);
    assert!(laid.height() - ink.height() > 1.0, "the laid-out box {laid:?} reaches past the glyphs {ink:?}");
    let measured = vectorcraft_text::envelope_ink(&t, t.xf, None).unwrap();
    assert!(off(measured, ink) < 1e-6, "the envelope measure gives the glyphs' box: {measured:?} vs {ink:?}");
    let before = vectorcraft_doc::live::envelope_content_bounds(std::slice::from_ref(&n)).unwrap();
    assert!(off(before, laid) < 1e-6, "with nothing registered, type keeps its laid-out box: {before:?} vs {laid:?}");

    let _ = vectorcraft_render::Renderer::new();
    let after = vectorcraft_doc::live::envelope_content_bounds(&[n]).unwrap();
    assert!(off(after, ink) < 1e-6, "after a renderer is made, type is measured by its glyphs: {after:?} vs {ink:?}");
}