use std::ffi::OsString;

use clap::Parser;
use eframe::egui;
use egui_extras::RetainedImage;
use fast_qr::convert::image::ImageBuilder;

use godiva::qr::*;

#[derive(Parser, Debug)]
#[clap(author, version, trailing_var_arg = true)]
struct Cli {
    #[clap(long, short, help = "File to expose")]
    pub file: Option<OsString>,
    text: Vec<String>,
}

impl Cli {
    pub fn text(&self) -> &Vec<String> {
        &self.text
    }
}

fn main() -> Result<(), eframe::Error> {
    env_logger::init(); // Log to stderr (if you run with `RUST_LOG=debug`).

    let cli = Cli::parse();

    let content = if let Some(file) = cli.file {
        file.to_string_lossy().bytes().collect()
    } else {
        cli.text().join(" ").bytes().collect()
    };

    //println!("content: {content}");

    let options = eframe::NativeOptions {
        initial_window_size: Some(egui::vec2(1200.0, 1200.0)),
        ..Default::default()
    };

    eframe::run_native(
        "Show an image with eframe/egui",
        options,
        Box::new(|_cc| {
            Box::new(Flasher {
                content,
                mode: Mode::Ascii,
            })
        }),
    )
}

struct Flasher {
    pub content: Vec<u8>,
    pub mode: Mode,
}

impl eframe::App for Flasher {
    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
        egui::CentralPanel::default().show(ctx, |ui| {
            let heading_text = String::from_utf8(self.content.clone()).unwrap();
            let len = heading_text.len();
            ui.heading(heading_text);
            let size = get_size(len, self.mode);
            let version = get_version(size, fast_qr::ECL::H);
            let qr = fast_qr::QRBuilder::new(self.content.clone())
                .version(version)
                .build()
                .unwrap();
            let bytes = ImageBuilder::default()
                .fit_width(1100)
                .to_pixmap(&qr)
                .encode_png()
                .unwrap();

            let img = RetainedImage::from_image_bytes("generated qr code", &bytes).unwrap();
            img.show(ui);
        });
    }
}