//! Automated visual check for the Leaves brush.
//!
//! Purpose: Renders several Leaf strokes onto a transparent canvas using the
//! public engine API and saves the result as a PNG. Used for manual inspection
//! and regression detection.

use hcie_engine_api::{BrushStyle, BrushTip, Engine};

#[test]
#[ignore = "manual visual check: run with --ignored --test leaves_check and inspect target/leaves_check.png"]
fn leaves_brush_visual_check() {
    let mut engine = Engine::new_with_options("LeavesCheck", 512, 512, false);
    let layer_id = engine.active_layer_id();

    let mut tip = BrushTip::default();
    tip.style = BrushStyle::Leaf;
    tip.size = 70.0;
    tip.opacity = 0.95;
    tip.hardness = 0.85;
    tip.spacing = 0.35;
    tip.color_variant = true;
    tip.variant_amount = 0.5;
    engine.set_brush_tip(tip);
    engine.set_color([40, 140, 40, 255]);

    engine.begin_stroke(layer_id, 100.0, 400.0);
    for i in 0..=30 {
        let t = i as f32 / 30.0;
        let x = 80.0 + t * 120.0;
        let y = 400.0 - (t * 40.0).sin() * 20.0 - t * 30.0;
        engine.stroke_to(layer_id, x, y, 0.6 + 0.4 * (1.0 - t));
    }
    engine.end_stroke(layer_id);

    engine.begin_stroke(layer_id, 300.0, 420.0);
    for i in 0..=25 {
        let t = i as f32 / 25.0;
        let x = 300.0 + t * 10.0;
        let y = 420.0 - t * 80.0;
        engine.stroke_to(layer_id, x, y, 1.0);
    }
    engine.end_stroke(layer_id);

    let pixels = engine.get_composite_pixels();
    let mut output_layer = hcie_protocol::Layer::new_transparent("", 512, 512);
    output_layer.pixels = pixels.clone();
    let out_dir = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
        .parent()
        .unwrap()
        .join("target");
    std::fs::create_dir_all(&out_dir).unwrap();
    let path = out_dir.join("leaves_check.png");
    hcie_engine_api::dynamic_loader::save_image(&output_layer, &path, "png").expect("save png");

    let has_color = pixels
        .chunks_exact(4)
        .any(|p| p[3] > 0 && (p[0] != 255 || p[1] != 255 || p[2] != 255));
    assert!(has_color, "Leaves check produced no colored pixels");
}