use std::collections::HashSet;

fn main() {
    println!("Hello, world!");
}

fn calculate_angle(x_offset: i32, y_offset: i32) -> f32 {
    return ((y_offset as f32).atan2(x_offset as f32).to_degrees() * 1000.0).round();
}

fn parse_input(raw: std::str::Lines) -> HashSet<(i32, i32)> {
    unimplemented!()
}

fn part1(asteroids: &HashSet<(i32, i32)>) -> (i32, i32) {
    unimplemented!()
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_angle_calculation() {
        assert_eq!(calculate_angle(1, 1), 45_000.0);
        assert_eq!(calculate_angle(1, 0), 0.0);
        assert_eq!(calculate_angle(0, -1), -90_000.0);
        assert_eq!(calculate_angle(2, 1), 26_565.0);
        assert_eq!(calculate_angle(1, 1), calculate_angle(3, 3));
        assert_eq!(calculate_angle(-2, -2), -135_000.0);
        assert_eq!(calculate_angle(-2, 2), 135_000.0);
        assert_ne!(calculate_angle(1, 1), calculate_angle(3, -3));
    }

    #[test]
    fn test_part_1() {
        assert_eq!(
            part1(&parse_input(
                ".#..#
.....
#####
....#
...##"
                    .lines()
            )),
            (3, 4)
        );

        assert_eq!(
            part1(&parse_input(
                "#.#...#.#.
.###....#.
.#....#...
##.#.#.#.#
....#.#.#.
.##..###.#
..#...##..
..##....##
......#...
.####.###."
                    .lines()
            )),
            (1, 2)
        );
        assert_eq!(
            part1(&parse_input(
                ".#..#..###
####.###.#
....###.#.
..###.##.#
##.##.#.#.
....###..#
..#.#..#.#
#..#.#.###
.##...##.#
.....#.#.."
                    .lines()
            )),
            (6, 3)
        );
        assert_eq!(
            part1(&parse_input(
                "......#.#.
#..#.#....
..#######.
.#.#.###..
.#..#.....
..#....#.#
#..#....#.
.##.#..###
##...#..#.
.#....####"
                    .lines()
            )),
            (5, 8)
        );
        assert_eq!(
            part1(&parse_input(
                ".#..##.###...#######
##.############..##.
.#.######.########.#
.###.#######.####.#.
#####.##.#.##.###.##
..#####..#.#########
####################
#.####....###.#.#.##
##.#################
#####.##.###..####..
..######..##.#######
####.##.####...##..#
.#####..#.######.###
##...#.##########...
#.##########.#######
.####.#.###.###.#.##
....##.##.###..#####
.#.#.###########.###
#.#.#.#####.####.###
###.##.####.##.#..##"
                    .lines()
            )),
            (11, 13)
        );
    }
}