const rl = @import("raylib");
const Stack = @This();

pub const Direction = enum {
    top_to_bottom,
    bottom_to_top,
    left_to_right
};

unused_box: rl.Rectangle,
dir: Direction,
gap: f32 = 0,

pub fn init(box: rl.Rectangle, dir: Direction) Stack {
    return Stack{
        .unused_box = box,
        .dir = dir
    };
}

pub fn next(self: *Stack, size: f32) rl.Rectangle {
    return switch (self.dir) {
        .top_to_bottom => {
            const next_box = rl.Rectangle.init(self.unused_box.x, self.unused_box.y, self.unused_box.width, size);
            self.unused_box.y += size;
            self.unused_box.y += self.gap;
            return next_box;
        },
        .bottom_to_top => {
            const next_box = rl.Rectangle.init(self.unused_box.x, self.unused_box.y + self.unused_box.height - size, self.unused_box.width, size);
            self.unused_box.height -= size;
            self.unused_box.height -= self.gap;
            return next_box;
        },
        .left_to_right => {
            const next_box = rl.Rectangle.init(self.unused_box.x, self.unused_box.y, size, self.unused_box.height);
            self.unused_box.x += size;
            self.unused_box.x += self.gap;
            return next_box;
        },
    };
}