use dimensions::{calculate_resize_dimensions, Dimensions};
use image::ImageReader;
use macroquad::prelude::*;

mod dimensions;

fn window_conf() -> Conf {
    Conf {
        window_title: String::from("Photo"),
        window_width: 2560,
        window_height: 1440,
        fullscreen: true,
        ..Default::default()
    }
}

fn display_image(texture: &Texture2D) {
    let screen_width = screen_width();
    let screen_height = screen_height();
    draw_texture(
        &texture,
        clamp(screen_width - texture.width(), 0.0f32, screen_width) / 2.0f32,
        clamp(screen_height - texture.height(), 0.0f32, screen_height) / 2.0f32,
        WHITE,
    );
}

#[macroquad::main(window_conf)]
async fn main() {
    show_mouse(false);
    let image = ImageReader::open("examples/test.jpg")
        .unwrap()
        .decode()
        .unwrap();

    let screen_dim = Dimensions::new(screen_width() as u32, screen_height() as u32);
    let image_dim = Dimensions::new(image.width(), image.height());

    let new_dim = calculate_resize_dimensions(screen_dim, image_dim);
    let image = image.resize(
        new_dim.width,
        new_dim.height,
        image::imageops::FilterType::Lanczos3,
    );

    let texture = Texture2D::from_rgba8(
        image.width().try_into().unwrap(),
        image.height().try_into().unwrap(),
        &image.into_rgba8().to_vec(),
    );

    loop {
        clear_background(BLACK);
        if is_quit_requested() || is_key_released(KeyCode::Escape) {
            break;
        }

        display_image(&texture);
        next_frame().await
    }
}