//! Global application state.


use alsa_card::*;
use audio::*;
use errors::*;
use gtk;
use hotkeys::Hotkeys;
use prefs::*;
use std::cell::RefCell;
use std::rc::Rc;
use support_audio::*;
use ui_entry::Gui;

#[cfg(feature = "notify")]
use notif::*;



// TODO: destructors
/// The global application state struct.
pub struct AppS<T>
    where T: AudioFrontend
{
    _cant_construct: (),
    /// Mostly static GUI state.
    pub gui: Gui,
    /// Audio state.
    pub audio: Rc<T>,
    /// Preferences state.
    pub prefs: RefCell<Prefs>,
    #[cfg(feature = "notify")]
    /// Notification state. In case of initialization failure, this
    /// is set to `None`.
    pub notif: Option<Notif>,
    /// Hotkey state.
    pub hotkeys: RefCell<Box<Hotkeys<T>>>, // Gets an Rc to Audio.
}


/// Create a new application state using the `AlsaBackend`.
pub fn new_alsa_appstate() -> AppS<AlsaBackend> {
    let prefs = RefCell::new(unwrap_error!(Prefs::new(), None));

    let card_name = prefs.borrow()
        .device_prefs
        .card
        .clone();
    let chan_name = prefs.borrow()
        .device_prefs
        .channel
        .clone();
    let audio = Rc::new(unwrap_error!(AlsaBackend::new(Some(card_name),
                                                       Some(chan_name)),
                                      None));
    return AppS::new(prefs, audio);
}


impl<T> AppS<T>
    where T: AudioFrontend
{
    /// Create an application state instance. There should really only be one.
    pub fn new(prefs: RefCell<Prefs>, audio: Rc<T>) -> Self {
        let builder_popup_window =
            gtk::Builder::new_from_string(include_str!(concat!(env!("CARGO_MANIFEST_DIR"),
                                                               "/data/ui/popup-window.glade")));
        let builder_popup_menu =
            gtk::Builder::new_from_string(include_str!(concat!(env!("CARGO_MANIFEST_DIR"),
                                                               "/data/ui/popup-menu.glade")));


        // TODO: better error handling
        #[cfg(feature = "notify")]
        let notif = result_warn!(Notif::new(&prefs.borrow()), None).ok();


        let hotkeys = unwrap_error!(wresult_warn!(
                    Hotkeys::new(&prefs.borrow(),
                                 audio.clone()), None),
                                    None);

        let gui =
            Gui::new(builder_popup_window, builder_popup_menu, &prefs.borrow());

        return AppS {
                   _cant_construct: (),
                   gui,
                   audio,
                   prefs,
                   #[cfg(feature = "notify")]
                   notif,
                   hotkeys: RefCell::new(hotkeys),
               };
    }


    /* some functions that need to be easily accessible */

    /// Update the tray icon state.
    pub fn update_tray_icon(&self) -> Result<()> {
        debug!("Update tray icon!");
        return self.gui.tray_icon.update_all(&self.prefs.borrow(),
                                             self.audio.as_ref(),
                                             None);
    }

    /// Update the Popup Window state.
    pub fn update_popup_window(&self) -> Result<()> {
        debug!("Update PopupWindow!");
        return self.gui.popup_window.update(self.audio.as_ref());
    }

    #[cfg(feature = "notify")]
    /// Update the notification state.
    pub fn update_notify(&self) {
        match self.notif {
            Some(ref n) => n.reload(&self.prefs.borrow()),
            None => warn!("Notification system not unitialized, skipping update"),
        }
    }

    #[cfg(not(feature = "notify"))]
    /// Update the notification state.
    pub fn update_notify(&self) {}

    /// Update the audio state.
    pub fn update_audio(&self, user: AudioUser) -> Result<()> {
        return audio_reload(self.audio.as_ref(), &self.prefs.borrow(), user);
    }

    /// Update the config file.
    pub fn update_config(&self) -> Result<()> {
        let prefs = self.prefs.borrow_mut();
        return prefs.store_config();
    }

    /// Update hotkey state.
    pub fn update_hotkeys(&self) -> Result<()> {
        let prefs = self.prefs.borrow();
        return self.hotkeys.borrow_mut().reload(&prefs);
    }
}