use crate::api::Result;
use tauri::{Emitter, Manager, Runtime};
use theseus::prelude::*;
use theseus::{ProxyConfig, ProxyTestResult};

pub fn init<R: tauri::Runtime>() -> tauri::plugin::TauriPlugin<R> {
    tauri::plugin::Builder::new("settings")
        .invoke_handler(tauri::generate_handler![
            settings_get,
            settings_set,
            download_engine_set,
            cancel_directory_change,
            proxy_get,
            proxy_set,
            proxy_test,
            set_ui_scale
        ])
        .build()
}

// Get full settings
// invoke('plugin:settings|settings_get')
#[tauri::command]
pub async fn settings_get() -> Result<Settings> {
    let res = settings::get().await?;
    Ok(res)
}

// Set full settings
// invoke('plugin:settings|settings_set', settings)
#[tauri::command]
pub async fn settings_set(
    app: tauri::AppHandle<impl Runtime>,
    settings: Settings,
) -> Result<()> {
    settings::set(settings.clone()).await?;
    let state = State::get().await?;
    state.update_http_client_for_settings(&settings).await?;
    let _ = app.emit("settings", ());
    Ok(())
}

#[tauri::command]
pub async fn set_ui_scale(
    app: tauri::AppHandle<impl Runtime>,
    factor: f64,
) -> Result<()> {
    if let Some(window) = app.get_webview_window("main") {
        let _ = window.set_zoom(factor);
    }
    Ok(())
}

#[tauri::command]
pub async fn download_engine_set(
    engine: settings::DownloadEngine,
) -> Result<()> {
    settings::set_download_engine(engine).await?;
    Ok(())
}

#[tauri::command]
pub async fn cancel_directory_change<R: Runtime>(
    app: tauri::AppHandle<R>,
) -> Result<()> {
    let identifier = &app.config().identifier;
    settings::cancel_directory_change(identifier).await?;
    Ok(())
}

#[tauri::command]
pub async fn proxy_get() -> Result<ProxyConfig> {
    let state = State::get().await?;
    Ok(state.proxy_config().await?)
}

#[tauri::command]
pub async fn proxy_set(config: ProxyConfig) -> Result<()> {
    let state = State::get().await?;
    config.validate()?;
    state.update_proxy_config(&config).await?;
    Ok(())
}

#[tauri::command]
pub async fn proxy_test(config: ProxyConfig) -> Result<ProxyTestResult> {
    if let Err(e) = config.validate() {
        return Ok(ProxyTestResult {
            success: false,
            latency_ms: None,
            message: e.to_string(),
        });
    }
    let client = theseus::build_proxied_client(&config);
    let started = std::time::Instant::now();
    match client
        .get("http://connect.rom.miui.com/generate_204")
        .send()
        .await
    {
        Ok(response) if response.status().is_success() => {
            let latency_ms = started.elapsed().as_millis() as u64;
            Ok(ProxyTestResult {
                success: true,
                latency_ms: Some(latency_ms),
                message: format!("Connection successful ({latency_ms} ms)"),
            })
        }
        Ok(response) => {
            let latency_ms = started.elapsed().as_millis() as u64;
            Ok(ProxyTestResult {
                success: false,
                latency_ms: Some(latency_ms),
                message: format!("HTTP {}", response.status()),
            })
        }
        Err(e) => Ok(ProxyTestResult {
            success: false,
            latency_ms: None,
            message: format!("{e}"),
        }),
    }
}