use servicepoint::{Bitmap, WindowMut};
#[derive(Debug, Clone, Copy)]
pub struct Bar {
    pub progress: f64,
}

impl Bar {
    pub fn new() -> Self {
        Self { progress: 0.0 }
    }

    pub fn draw(&self, mut bitmap: WindowMut<bool, Bitmap>) {
        bitmap.fill(false);

        let padding = 1;
        let mut bitmap = bitmap
            .window_mut(
                padding,
                padding,
                bitmap.width() - 2 * padding,
                bitmap.height() - 2 * padding,
            )
            .unwrap();

        // border top + bottom
        let last_row = bitmap.height() - 1;
        for x in 0..bitmap.width() {
            bitmap.set(x, 0, true);
            bitmap.set(x, last_row, true);
        }

        // border left + right
        let last_col = bitmap.width() - 1;
        for y in 0..bitmap.height() {
            bitmap.set(0, y, true);
            bitmap.set(last_col, y, true);
        }

        // progress fill
        let fill_to = (bitmap.width() as f64 * self.progress) as usize;
        for y in 1..bitmap.height() - 1 {
            for x in 1..bitmap.width() - 1 {
                bitmap.set(x, y, x < fill_to && (x + y) % 2 == 0);
            }
        }
    }
}