mod commands;
mod db;
mod gst;
mod logo;
mod models;
mod selftest;

use rusqlite::Connection;
use std::path::{Path, PathBuf};
use std::sync::Mutex;
use tauri::Manager;
use tauri_plugin_dialog::{DialogExt, MessageDialogKind};

pub struct AppState {
    pub db: Mutex<Connection>,
    pub data_dir: PathBuf,
    /// Machine-local, non-roaming data (the PDF archive). On Windows this is
    /// %LOCALAPPDATA%, unlike `data_dir`, which is the roaming location.
    pub local_data_dir: PathBuf,
}

/// Show a native error dialog. Release builds have no console on Windows, so
/// without this a startup failure would look like the app silently not opening.
fn show_startup_error(app: &tauri::App, error: &dyn std::fmt::Display, data_dir: Option<&Path>) {
    let location = data_dir
        .map(|d| format!("\n\nData directory:\n{}", d.display()))
        .unwrap_or_default();
    eprintln!("Voiced could not start: {error}");
    app.dialog()
        .message(format!("{error}{location}"))
        .title("Voiced could not start")
        .kind(MessageDialogKind::Error)
        .blocking_show();
}

fn init_state(app: &tauri::App) -> Result<AppState, Box<dyn std::error::Error>> {
    let data_dir = match app.path().app_data_dir() {
        Ok(dir) => dir,
        Err(e) => {
            show_startup_error(app, &format!("Could not resolve the application data directory: {e}"), None);
            return Err(e.into());
        }
    };
    if let Err(e) = std::fs::create_dir_all(&data_dir) {
        show_startup_error(app, &format!("Could not create the application data directory: {e}"), Some(&data_dir));
        return Err(e.into());
    }
    let local_data_dir = match app.path().app_local_data_dir() {
        Ok(dir) => dir,
        Err(e) => {
            show_startup_error(app, &format!("Could not resolve the local data directory: {e}"), Some(&data_dir));
            return Err(e.into());
        }
    };
    if let Err(e) = std::fs::create_dir_all(&local_data_dir) {
        show_startup_error(app, &format!("Could not create the local data directory: {e}"), Some(&local_data_dir));
        return Err(e.into());
    }
    let conn = match db::open(&data_dir.join("voiced.db"), &data_dir.join("backups")) {
        Ok(conn) => conn,
        Err(e) => {
            show_startup_error(app, &format!("Could not open the database: {e}"), Some(&data_dir));
            return Err(e.into());
        }
    };
    if let Err(e) = db::relativize_asset_paths(&conn, &data_dir) {
        show_startup_error(app, &format!("Could not update stored image paths: {e}"), Some(&data_dir));
        return Err(e.into());
    }
    // Best effort: a logo that cannot be derived keeps working untrimmed, and the next start retries.
    if let Err(e) = commands::logo::ensure_logo_derived_impl(&conn, &data_dir) {
        eprintln!("Could not derive the logo images: {e}");
    }
    Ok(AppState {
        db: Mutex::new(conn),
        data_dir,
        local_data_dir,
    })
}

#[cfg_attr(mobile, tauri::mobile_entry_point)]
pub fn run() {
    // WebKitGTK's DMABUF renderer shows a blank window on several Linux GPU/driver
    // combinations. Respect an explicit user setting, otherwise turn it off.
    #[cfg(target_os = "linux")]
    if std::env::var_os("WEBKIT_DISABLE_DMABUF_RENDERER").is_none() {
        std::env::set_var("WEBKIT_DISABLE_DMABUF_RENDERER", "1");
    }

    let builder = tauri::Builder::default();

    // The single-instance plugin must be registered before every other plugin.
    #[cfg(desktop)]
    let builder = builder
        .plugin(tauri_plugin_single_instance::init(|app, _argv, _cwd| {
            if let Some(window) = app.get_webview_window("main") {
                let _ = window.unminimize();
                let _ = window.show();
                let _ = window.set_focus();
            }
        }))
        .plugin(tauri_plugin_window_state::Builder::default().build());

    let result = builder
        .plugin(tauri_plugin_opener::init())
        .plugin(tauri_plugin_dialog::init())
        .setup(|app| {
            let state = init_state(app)?;
            app.manage(state);
            Ok(())
        })
        .invoke_handler(tauri::generate_handler![
            commands::settings::get_settings,
            commands::settings::save_settings,
            commands::settings::list_banks,
            commands::settings::save_bank,
            commands::settings::delete_bank,
            commands::series::get_active_series,
            commands::series::list_series,
            commands::series::start_new_series,
            commands::clients::list_clients,
            commands::clients::save_client,
            commands::clients::delete_client,
            commands::invoice::peek_next_invoice_number,
            commands::invoice::issue_invoice,
            commands::invoice::cancel_invoice,
            commands::invoice::list_invoices,
            commands::invoice::get_invoice,
            commands::invoice::save_draft,
            commands::invoice::list_drafts,
            commands::invoice::get_draft,
            commands::invoice::delete_draft,
            commands::assets::import_asset,
            commands::assets::save_asset_bytes,
            commands::assets::read_asset_data_uri,
            commands::assets::remove_asset,
            commands::logo::import_logo,
            commands::logo::save_logo_bytes,
            commands::logo::ensure_logo_derived,
            commands::logo::remove_logo,
            commands::archive::archive_pdf,
            commands::archive::read_archive,
            commands::archive::archive_status,
            commands::fonts::inspect_font,
            commands::fonts::import_font,
            commands::fonts::list_user_fonts,
            commands::fonts::get_user_font_bytes,
            commands::fonts::remove_user_font,
            commands::files::write_export_file,
            commands::files::get_last_export_dir,
            commands::files::reveal_in_folder,
            commands::files::open_file,
            selftest::selftest_config,
            selftest::selftest_report,
        ])
        .run(tauri::generate_context!());

    if let Err(e) = result {
        eprintln!("error while running the Voiced application: {e}");
        std::process::exit(1);
    }
}