use owm_rs::free_api_v25::current::WeatherResponse;
use owm_widg_config::config::Config;
use slint::{LogicalPosition, LogicalSize, SharedString};

use i_slint_backend_winit::{
    Backend,
    winit::{
        platform::x11::{WindowAttributesExtX11, WindowType},
        window::WindowAttributes,
    },
};

slint::include_modules!();

fn unit_symbol(units: &str) -> char {
    match units {
        "metric" => 'C',
        "imperial" => 'F',
        "standard" => 'K',
        _ => '?',
    }
}

pub fn show_popup(resp: &WeatherResponse, cfg: &Config) -> Result<(), Box<dyn std::error::Error>> {
    // Closure that adjusts winit WindowAttributes before Slint creates the window.
    let window_attrs = |attrs: WindowAttributes| {
        // Mark the X11 window as a DOCK so the WM treats it as a top bar/panel.
        attrs.with_x11_window_type(vec![WindowType::Dock])
    };

    // Build a Slint backend that applies this attribute hook to all windows.
    let backend = Backend::builder()
        .with_window_attributes_hook(window_attrs) // Register the hook
        .build()?; // Construct backend

    // Activate this customized backend for all Slint window creation and events.
    slint::platform::set_platform(Box::new(backend))?;

    let ui = MainWindow::new()?;

    let city = resp.name.clone().unwrap_or_else(|| "Unknown".into());
    let country = resp
        .sys
        .as_ref()
        .and_then(|s| s.country.clone())
        .unwrap_or_default();

    let (weather_main, weather_description, icon_code) = resp.weather.first().map_or_else(
        || ("N/A".into(), "N/A".into(), String::new()),
        |w| (w.main.clone(), w.description.clone(), w.icon.clone()),
    );

    let temp = resp.main.as_ref().and_then(|m| m.temp).unwrap_or(0.0);
    let temperature = format!("{temp:.1}");

    let unit_symbol = unit_symbol(cfg.query_params.units.as_str());

    ui.set_city(SharedString::from(city));
    ui.set_country(SharedString::from(country));
    ui.set_weather_main(SharedString::from(weather_main));
    ui.set_weather_description(SharedString::from(weather_description));
    ui.set_weather_icon(SharedString::from(icon_to_nerd_font(&icon_code)));
    ui.set_temperature(SharedString::from(temperature));
    ui.set_unit(SharedString::from(unit_symbol));

    #[allow(clippy::cast_precision_loss)]
    ui.window().set_size(LogicalSize::new(300.0, 124.0));

    // Position the window (bar) at the top-left.
    ui.window().set_position(LogicalPosition::new(0.0, 0.0));

    ui.run()?;
    Ok(())
}

/// Convert OWM icon codes (e.g. "01d", "09n") to Nerd Font weather glyphs.
fn icon_to_nerd_font(code: &str) -> String {
    match code {
        "01d" => "",         // clear day
        "01n" => "",         // clear night
        "02d" | "02n" => "", // few clouds
        "03d" | "03n" => "", // scattered clouds
        "04d" | "04n" => "", // broken clouds
        "09d" | "09n" => "", // shower rain
        "10d" | "10n" => "", // rain
        "11d" | "11n" => "", // thunderstorm
        "13d" | "13n" => "", // snow
        "50d" | "50n" => "", // mist
        _ => "",
    }
    .into()
}