use std::cmp::{max, min};

#[derive(Debug, PartialEq, Eq, Hash, Copy, Clone)]
pub struct Size {
    pub width: usize,
    pub height: usize,
}

impl specs::Component for Size {
    type Storage = specs::VecStorage<Self>;
}

impl From<[usize; 2]> for Size {
    fn from([width, height]: [usize; 2]) -> Size {
        Size { width, height }
    }
}

#[derive(Debug, PartialEq, Eq, Hash, Copy, Clone)]
pub struct Coord {
    pub x: usize,
    pub y: usize,
}

impl specs::Component for Coord {
    type Storage = specs::VecStorage<Coord>;
}

impl From<[usize; 2]> for Coord {
    fn from([x, y]: [usize; 2]) -> Coord {
        Coord { x, y }
    }
}

#[derive(Debug, PartialEq, Eq, Hash, Copy, Clone)]
pub struct Rect {
    pub origin: Coord,
    pub size: Size,
}

impl Rect {
    pub fn new(origin: impl Into<Coord>, size: impl Into<Size>) -> Rect {
        let origin = origin.into();
        let size = size.into();
        Rect { origin, size }
    }

    pub fn from_points(p1: impl Into<Coord>, p2: impl Into<Coord>) -> Rect {
        let p1 = p1.into();
        let p2 = p2.into();
        let origin = Coord {
            x: min(p1.x, p2.x),
            y: min(p1.y, p2.y),
        };
        let size = Size {
            width: max(max(p1.x, p2.x) - origin.x, 1),
            height: max(max(p1.y, p2.y) - origin.y, 1),
        };
        Rect { origin, size }
    }

    pub fn area(&self) -> usize {
        self.size.width * self.size.height
    }

    pub fn width(&self) -> usize {
        self.size.width
    }

    pub fn height(&self) -> usize {
        self.size.height
    }

    pub fn x(&self) -> usize {
        self.origin.x
    }

    pub fn y(&self) -> usize {
        self.origin.y
    }

    pub fn contains(&self, pt: impl Into<Coord>) -> bool {
        let pt = pt.into();
        pt.x >= self.origin.x
            && pt.y >= self.origin.y
            && pt.x < self.origin.x + self.size.width
            && pt.y < self.origin.y + self.size.height
    }

    pub fn overlaps(&self, other: Rect) -> bool {
        if self.x() > other.x() + other.width() || other.x() > self.x() + self.width() {
            return false;
        }
        if self.y() > other.y() + other.height() || other.y() > self.y() + self.height() {
            return false;
        }
        true
    }

    pub fn center(&self) -> Coord {
        Coord {
            x: self.x() + (self.width() / 2),
            y: self.y() + (self.height() / 2),
        }
    }
}