/*
 * Copyright (c) Peter Bjorklund. All rights reserved. https://github.com/piot/fixed32-math-rs
 * Licensed under the MIT License. See LICENSE in the project root for license information.
 */
use fixed32::Fp;

use fixed32_math::{Rect, Vector};

#[test]
fn multiply_fp_vector() {
    let result = Fp::from(2) * Vector::from((10, 33));
    assert_eq!(result.x, Fp::from(20));
    assert_eq!(result.y, Fp::from(66));
}

#[test]
fn multiply_vector_fp() {
    let result = Vector::from((10, 33)) * Fp::from(2);
    assert_eq!(result.x, Fp::from(20));
    assert_eq!(result.y, Fp::from(66));
}

#[test]
fn rect_from() {
    let result = Rect::from((10, 33, 20, 30));
    assert_eq!(result.pos, Vector::from((10, 33)));
    assert_eq!(result.size, Vector::from((20, 30)));
}

#[test]
fn rect_move() {
    let result = Rect::from((10, 33, 20, 30)).move_by(Vector::from((18, -2)));
    assert_eq!(result.pos, Vector::from((28, 31)));
    assert_eq!(result.size, Vector::from((20, 30)));
}

#[test]
fn test_rotate_0_degrees() {
    let vector = Vector {
        x: Fp::from(1.0),
        y: Fp::from(0.0),
    };
    let angle = Fp::from(0);
    let rotated = vector.rotate(angle);
    assert_eq!(
        rotated,
        Vector {
            x: Fp::from(1.0),
            y: Fp::from(0.0)
        }
    );
}

#[test]
fn test_rotate_90_degrees() {
    let vector = Vector {
        x: Fp::from(1.0),
        y: Fp::from(0.0),
    };
    let angle = Fp::FRAC_PI_2; // 90 degrees (π/2)
    let rotated = vector.rotate(angle);
    let expected_vector = Vector {
        x: Fp::from(0.0),
        y: Fp::from(1.0),
    };
    let len = (expected_vector - rotated).sqr_len();

    assert!(len < Fp::from(0.01));
}

#[test]
fn test_rotate_270_degrees() {
    let vector = Vector::new(Fp::from(1.0), Fp::from(0.0));
    let angle = Fp::from(3.0 * std::f32::consts::FRAC_PI_2); // 270 degrees (3π/2)
    let rotated = vector.rotate(angle);
    let expected_vector = Vector::new(Fp::from(0.0), Fp::from(-1.0));
    let len = (expected_vector - rotated).sqr_len();
    assert!(len < Fp::from(0.01));
}
#[test]
fn test_contains_point_inside() {
    let rect = Rect::new(Vector::from((0, 0)), Vector::from((10, 10)));
    let point_inside = Vector::from((5, 5));
    assert!(rect.contains_point(&point_inside));
}

#[test]
fn test_contains_point_near_edge() {
    let rect = Rect::new(Vector::from((0, 0)), Vector::from((10, 10)));
    let point_on_edge = Vector::from((9, 5));
    assert!(rect.contains_point(&point_on_edge));
}

#[test]
fn test_contains_point_outside() {
    let rect = Rect::new(Vector::from((0, 0)), Vector::from((10, 10)));
    let point_outside = Vector::from((10, 5));
    assert!(!rect.contains_point(&point_outside));
}

#[test]
fn test_intersection_no_overlap() {
    let rect1 = Rect::new(Vector::from((0, 0)), Vector::from((10, 10)));
    let rect2 = Rect::new(Vector::from((15, 15)), Vector::from((10, 10)));
    assert_eq!(rect1.intersection(&rect2), None);
}

#[test]
fn test_intersection_partial_overlap() {
    let rect1 = Rect::new(Vector::from((0, 0)), Vector::from((10, 10)));
    let rect2 = Rect::new(Vector::from((5, 5)), Vector::from((10, 10)));
    let expected = Rect::new(Vector::from((5, 5)), Vector::from((5, 5)));
    assert_eq!(rect1.intersection(&rect2), Some(expected));
}

#[test]
fn test_intersection_full_overlap() {
    let rect1 = Rect::new(Vector::from((0, 0)), Vector::from((10, 10)));
    let rect2 = Rect::new(Vector::from((2, 2)), Vector::from((5, 5)));
    let expected = Rect::new(Vector::from((2, 2)), Vector::from((5, 5)));
    assert_eq!(rect1.intersection(&rect2), Some(expected));
}