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use std::fs;
use image::{Luma};
use qrcode::{QrCode};
use qrcode::render::{svg};
use image;

/// 生成 svg 二维码
pub fn qrcode_create(text: &str, mode: &str, filename: &str) -> bool {
    let code = QrCode::new(text).unwrap();
    match mode {
        "svg" => {
            let string = code.render()
                .min_dimensions(200, 200)
                .dark_color(svg::Color("#000000"))
                .light_color(svg::Color("#ffffff"))
                .build();
            match fs::write(filename, string) {
                Ok(_) => true,
                Err(_) => false
            }
        }
        "png" => {
            let image = code.render::<Luma<u8>>()
                .min_dimensions(200, 200)
                .build();
            match image.save(filename) {
                Ok(()) => true,
                Err(_) => false
            }
        }
        _ => {
            let image = code.render::<Luma<u8>>()
                .min_dimensions(200, 200)
                .build();
            match image.save(filename) {
                Ok(()) => true,
                Err(_) => false
            }
        }
    }
}

pub fn qrcode_read(filename: &str) -> Vec<String> {
    let mut qrcode = vec![];

    let img = image::open(filename);
    let img_gray = match img {
        Ok(e) => e.into_luma8(),
        Err(_) => {
            return qrcode;
        }
    };

    let mut decoder = quircs::Quirc::default();
    let codes = decoder.identify(img_gray.width() as usize, img_gray.height() as usize, &img_gray);
    for code in codes {
        let code = match code {
            Ok(e) => e,
            Err(_) => {
                return qrcode;
            }
        };
        let decoded = match code.decode() {
            Ok(e) => e,
            Err(_) => {
                return qrcode;
            }
        };
        qrcode.push(format!("{}", std::str::from_utf8(&decoded.payload.clone()).unwrap()));
    }
    qrcode
}