use super::*;
use crate::model::{Node, NodeKind};
use egui_kittest::{Harness, kittest::Queryable};

#[test]
fn the_welcome_canvas_is_valid_and_connected() {
    let canvas = welcome_canvas();
    assert_eq!(canvas.nodes.len(), 4);
    assert_eq!(canvas.edges.len(), 3);
    let mut copy = canvas.clone();
    assert_eq!(copy.drop_dangling_edges(), 0);
    // And it round-trips through the file format.
    assert_eq!(Canvas::from_json(&canvas.to_json()).unwrap(), canvas);
}

// -- the whole application, driven the way a user drives it: real widgets,
// found by the label on them and clicked, with no window, compositor or
// pointer in the way.

/// Whether a harness can draw. Only the tests that look at a frame ask
/// for a renderer, so that the rest have nothing to say about the graphics
/// stack of the machine they run on.
enum Renderer {
    None,
    Wgpu,
}

/// The app on a canvas holding one note, with `text` in it.
fn harness_with_a_note(text: &str, renderer: Renderer) -> Harness<'static, App> {
    let mut canvas = Canvas::default();
    canvas.nodes.push(Node::new(
        "n",
        NodeKind::Text {
            text: text.to_owned(),
        },
        0,
        0,
        300,
        200,
    ));
    let builder = Harness::builder().with_size(egui::vec2(1200.0, 900.0));
    let builder = match renderer {
        Renderer::None => builder,
        Renderer::Wgpu => builder.wgpu(),
    };
    let mut harness = builder.build_eframe(|cc| App::new(cc, None));
    harness.state_mut().doc = Document::new();
    harness.state_mut().doc.canvas = canvas;
    harness.run();
    harness
}

/// The shell is real widgets too, found by the label on them.
#[test]
fn the_toolbar_adds_a_note_to_the_canvas() {
    let mut harness = harness_with_a_note("the only one", Renderer::None);
    assert_eq!(harness.state().doc.canvas.nodes.len(), 1);

    harness.get_by_label("Note").click();
    harness.run();

    assert_eq!(harness.state().doc.canvas.nodes.len(), 2);
}

/// The editor window as it is drawn: the text filling it, the ways out
/// along the bottom. Run `UPDATE_SNAPSHOTS=1 cargo test` after changing it
/// on purpose, and look at `tests/snapshots/*.diff.png` when it fails.
#[test]
fn the_editor_window_is_drawn_as_it_should_be() {
    let mut harness = harness_with_a_note("## A note\n\nWith text in it.", Renderer::Wgpu);
    harness.state_mut().view.edit_node("n");
    harness.run();
    harness.snapshot("editor-window");
}

#[test]
fn close_and_fit_sizes_the_card_and_closes_the_editor() {
    // More text than a 300x200 card can show.
    let mut harness = harness_with_a_note(&"word ".repeat(200), Renderer::None);
    harness.state_mut().view.edit_node("n");
    harness.run();

    harness.get_by_label("Close & Fit").click();
    harness.run();

    let app = harness.state();
    assert_eq!(app.view.editing(), None, "the editor stayed open");
    assert!(
        app.doc.canvas.node("n").unwrap().height > 200,
        "the card was not grown to its text"
    );
    assert_eq!(app.doc.undo_label(), Some("Fit to text"));
}

/// A file node follows its file when something else writes it.
#[test]
fn a_card_follows_a_file_changed_outside_the_editor() -> Result<(), Box<dyn std::error::Error>> {
    let dir =
        std::env::temp_dir().join(format!("jsoncanvas-outside-{}", crate::model::random_id()));
    std::fs::create_dir_all(&dir)?;
    let path = dir.join("note.md");
    std::fs::write(&path, "before the change\n")?;

    let mut canvas = Canvas::default();
    canvas.nodes.push(Node::new(
        "f",
        NodeKind::File {
            file: path.display().to_string(),
            subpath: None,
        },
        0,
        0,
        400,
        300,
    ));
    let mut harness = Harness::builder()
        .with_size(egui::vec2(1200.0, 900.0))
        .build_eframe(|cc| App::new(cc, None));
    harness.state_mut().doc = Document::new();
    harness.state_mut().doc.canvas = canvas;
    harness.run();
    assert!(harness.query_by_label("before the change").is_some());

    // Another program writes the file while the canvas is open.
    std::fs::write(&path, "after the change\n")?;
    // The check is on a timer; this is the same as waiting for it to come up.
    harness.state_mut().last_file_check = f64::MIN;
    harness.run();

    assert!(harness.query_by_label("after the change").is_some());
    assert!(
        harness.query_by_label("before the change").is_none(),
        "the card kept showing the text the file no longer holds"
    );

    // With an edit made here the card keeps it, and says the file moved on.
    harness
        .state_mut()
        .view
        .files
        .set(&path, "edited here\n".to_owned());
    std::fs::write(&path, "changed again, elsewhere\n")?;
    harness.state_mut().last_file_check = f64::MIN;
    harness.run();

    assert!(harness.query_by_label("edited here").is_some());
    assert!(
        harness.query_by_label("\u{26a0}").is_some(),
        "the card said nothing about the file changing under the edit"
    );

    std::fs::remove_dir_all(&dir)?;
    Ok(())
}