//! Real keyboard input must stay inside the dimensions of the shape being drawn.

use serde_json::json;

use crate::scenario::Harness;

fn drawing(command: &str) -> Harness {
    let mut h = Harness::new();
    h.app.run("sketch.create", json!({"plane": "XY"})).unwrap();
    h.step(&json!({"start": command})).unwrap();
    h.step(&json!({"click": {"world": [0, 0, 0]}})).unwrap();
    h.step(&json!({"move": {"world": [20, 10, 0]}})).unwrap();
    assert_focus(&h, 0);
    h
}

fn assert_focus(h: &Harness, index: usize) {
    let expected = egui::Id::new(("sc_dim", index));
    assert_eq!(h.ctx.memory(|memory| memory.focused()), Some(expected), "focus must stay in inline dimension {index}");
}

fn tab(h: &mut Harness, backwards: bool) {
    h.step(&json!({"key": "Tab", "shift": backwards})).unwrap();
}

fn type_value(h: &mut Harness, text: &str) {
    h.step(&json!({"key": "A", "cmd": true})).unwrap();
    h.step(&json!({"text": text})).unwrap();
}

#[test]
fn tabs_cycle_rectangle_dimensions_indefinitely_and_enter_commits_values() {
    for command in ["sketch.rectangle.two_point", "sketch.rectangle.center"] {
        let mut h = drawing(command);
        type_value(&mut h, "30");
        tab(&mut h, false);
        assert_focus(&h, 1);
        type_value(&mut h, "12");
        for i in 0..8 {
            tab(&mut h, false);
            assert_focus(&h, i % 2);
        }
        for i in 0..8 {
            tab(&mut h, true);
            assert_focus(&h, i % 2);
        }
        // Revisited locked dimensions are selected, so another value replaces them directly.
        h.step(&json!({"text": "14"})).unwrap();
        tab(&mut h, true);
        assert_focus(&h, 0);
        h.step(&json!({"text": "32"})).unwrap();
        let dims = &h.app.tool.as_ref().unwrap().dims;
        assert_eq!(dims.iter().map(|d| d.value.as_str()).collect::<Vec<_>>(), ["32", "14"]);
        assert!(dims.iter().all(|d| d.locked));
        h.step(&json!({"key": "Enter"})).unwrap();
        let state = h.app.session.world_state();
        let sketch = state.sketch(h.app.session.active_sketch.unwrap()).unwrap();
        assert_eq!(sketch.sketch.curves.iter().filter(|curve| !curve.construction).count(), 4);
        assert_eq!(sketch.profiles.len(), 1);
        assert!((sketch.profiles[0].area - 448.0).abs() < 1e-6, "{command}: {}", sketch.profiles[0].area);
    }
}

#[test]
fn line_dimensions_wrap_both_directions_and_enter_uses_length_and_angle() {
    let mut h = drawing("sketch.line");
    type_value(&mut h, "10");
    tab(&mut h, false);
    type_value(&mut h, "45 deg");
    for i in 0..6 {
        tab(&mut h, false);
        assert_focus(&h, i % 2);
    }
    tab(&mut h, true);
    assert_focus(&h, 0);
    h.step(&json!({"key": "Enter"})).unwrap();
    let state = h.app.session.world_state();
    let sketch = state.sketch(h.app.session.active_sketch.unwrap()).unwrap();
    assert_eq!(sketch.sketch.curves.len(), 1);
    let points: Vec<_> = sketch.sketch.points.iter().map(|point| point.pos).collect();
    assert!(points.iter().any(|point| (point.x - 10.0 / 2f64.sqrt()).abs() < 1e-6 && (point.y - 10.0 / 2f64.sqrt()).abs() < 1e-6));
}

#[test]
fn single_dimension_keeps_focus_for_tab_and_shift_tab() {
    let mut h = drawing("sketch.circle.center");
    type_value(&mut h, "8");
    for backwards in [false, false, true, true, false] {
        tab(&mut h, backwards);
        assert_focus(&h, 0);
    }
    assert_eq!(h.app.tool.as_ref().unwrap().dims[0].value, "8");
    h.step(&json!({"key": "Enter"})).unwrap();
    let state = h.app.session.world_state();
    let sketch = state.sketch(h.app.session.active_sketch.unwrap()).unwrap();
    assert_eq!(sketch.profiles.len(), 1);
    assert!((sketch.profiles[0].area - std::f64::consts::PI * 16.0).abs() < 1e-6);
}

#[test]
fn forward_tab_completes_expression_then_cycles_and_shift_tab_moves_back() {
    let mut h = drawing("sketch.rectangle.two_point");
    h.app.run("parameters.add", json!({"name": "width", "expression": "24 mm"})).unwrap();
    h.frames(2);
    type_value(&mut h, "wid");
    tab(&mut h, false);
    assert_focus(&h, 0);
    assert_eq!(h.app.tool.as_ref().unwrap().dims[0].value, "width");
    tab(&mut h, false);
    assert_focus(&h, 1);
    type_value(&mut h, "5");
    tab(&mut h, true);
    assert_focus(&h, 0);
    type_value(&mut h, "wid");
    tab(&mut h, true);
    assert_focus(&h, 1);
    assert_eq!(h.app.tool.as_ref().unwrap().dims[0].value, "wid", "Shift+Tab must navigate rather than accepting a completion");
    tab(&mut h, true);
    assert_focus(&h, 0);
    tab(&mut h, false);
    assert_focus(&h, 0);
    assert_eq!(h.app.tool.as_ref().unwrap().dims[0].value, "width");
    h.step(&json!({"key": "Enter"})).unwrap();
    let state = h.app.session.world_state();
    let sketch = state.sketch(h.app.session.active_sketch.unwrap()).unwrap();
    assert_eq!(sketch.profiles.len(), 1);
    assert!((sketch.profiles[0].area - 120.0).abs() < 1e-6);
}