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extern crate qrcode;
extern crate terminal_graphics;

use qrcode::QrCode;
use terminal_graphics::Display;
use terminal_graphics::Colour;

#[derive(Clone)]
pub struct TermQrCode {
    code: QrCode,
}

impl TermQrCode {
    // Generate a TermQrCode from Bytes.
    pub fn from_bytes<D: AsRef<[u8]>>(data: D) -> TermQrCode {
        let code = QrCode::new(data).unwrap();
        TermQrCode {
            code,
        }
    }

    // Print the QR code in the terminal.
    pub fn print(&self) {
        let code = self.code.clone();
        let width = code.width();
        let height = (width as f32/2 as f32).ceil() as usize;
        let pixels = code.to_colors();
        let mut display = Display::new((width + 2) as u32, (height + 1) as u32);
    
        for (i, pixel) in pixels.iter().enumerate() {
            let x = i % width;
            let y = (i as f32/width as f32).floor() as isize;

            let colour = match pixel {
                qrcode::types::Color::Light => Colour::White,
                qrcode::types::Color::Dark => Colour::Black,
            };

            let char_colour = match width % 2 {
                0 => colour,
                1 => Colour::White,
                _ => Colour::White,
            };

            match y % 2 {
                0 => display.set_pixel(x as isize + 1, (y/2) as isize + 1, '▄', char_colour, colour),
                1 => display.get_mut_pixel(x as isize + 1, ((y-1)/2) as isize + 1).set_colour(colour),
                _ => println!("That shouldn't happen"),
            }
        }

        for _i in 0..((height + 2) as u32) {
            println!();
        }

        display.print();
        
    }
}