use std::{
    any::Any,
    eprintln,
    net::TcpStream,
    sync::{Arc, Mutex},
    time::Instant,
    usize,
};

use musicdb_lib::{
    data::{database::Database, queue::Queue, AlbumId, ArtistId, SongId},
    load::ToFromBytes,
    server::Command,
};
use speedy2d::{
    color::Color,
    dimen::{UVec2, Vec2},
    font::Font,
    shape::Rectangle,
    window::{
        KeyScancode, ModifiersState, MouseButton, MouseScrollDistance, UserEventSender,
        VirtualKeyCode, WindowCreationOptions, WindowHandler, WindowHelper,
    },
    Graphics2D,
};

use crate::{gui_screen::GuiScreen, gui_wrappers::WithFocusHotkey};

pub enum GuiEvent {
    Refresh,
    UpdatedQueue,
    UpdatedLibrary,
    Exit,
}

pub fn main(
    database: Arc<Mutex<Database>>,
    connection: TcpStream,
    event_sender_arc: Arc<Mutex<Option<UserEventSender<GuiEvent>>>>,
) {
    let window = speedy2d::Window::<GuiEvent>::new_with_user_events(
        "MusicDB Client",
        WindowCreationOptions::new_fullscreen_borderless(),
    )
    .expect("couldn't open window");
    *event_sender_arc.lock().unwrap() = Some(window.create_user_event_sender());
    let sender = window.create_user_event_sender();
    window.run_loop(Gui::new(database, connection, event_sender_arc, sender));
}

pub struct Gui {
    pub event_sender: UserEventSender<GuiEvent>,
    pub database: Arc<Mutex<Database>>,
    pub connection: TcpStream,
    pub gui: GuiElem,
    pub size: UVec2,
    pub mouse_pos: Vec2,
    pub font: Font,
    pub last_draw: Instant,
    pub modifiers: ModifiersState,
    pub dragging: Option<(
        Dragging,
        Option<Box<dyn FnMut(&mut DrawInfo, &mut Graphics2D)>>,
    )>,
    pub line_height: f32,
    pub last_height: f32,
    pub scroll_pixels_multiplier: f64,
    pub scroll_lines_multiplier: f64,
    pub scroll_pages_multiplier: f64,
}
impl Gui {
    fn new(
        database: Arc<Mutex<Database>>,
        connection: TcpStream,
        event_sender_arc: Arc<Mutex<Option<UserEventSender<GuiEvent>>>>,
        event_sender: UserEventSender<GuiEvent>,
    ) -> Self {
        database.lock().unwrap().update_endpoints.push(
            musicdb_lib::data::database::UpdateEndpoint::Custom(Box::new(move |cmd| match cmd {
                Command::Resume
                | Command::Pause
                | Command::Stop
                | Command::Save
                | Command::SetLibraryDirectory(..) => {}
                Command::NextSong
                | Command::QueueUpdate(..)
                | Command::QueueAdd(..)
                | Command::QueueInsert(..)
                | Command::QueueRemove(..)
                | Command::QueueGoto(..) => {
                    if let Some(s) = &*event_sender_arc.lock().unwrap() {
                        _ = s.send_event(GuiEvent::UpdatedQueue);
                    }
                }
                Command::SyncDatabase(..)
                | Command::AddSong(_)
                | Command::AddAlbum(_)
                | Command::AddArtist(_)
                | Command::ModifySong(_)
                | Command::ModifyAlbum(_)
                | Command::ModifyArtist(_) => {
                    if let Some(s) = &*event_sender_arc.lock().unwrap() {
                        _ = s.send_event(GuiEvent::UpdatedLibrary);
                    }
                }
            })),
        );
        let line_height = 32.0;
        let scroll_pixels_multiplier = 1.0;
        let scroll_lines_multiplier = 3.0;
        let scroll_pages_multiplier = 0.75;
        Gui {
            event_sender,
            database,
            connection,
            gui: GuiElem::new(WithFocusHotkey::new_noshift(
                VirtualKeyCode::Escape,
                GuiScreen::new(
                    GuiElemCfg::default(),
                    line_height,
                    scroll_pixels_multiplier,
                    scroll_lines_multiplier,
                    scroll_pages_multiplier,
                ),
            )),
            size: UVec2::ZERO,
            mouse_pos: Vec2::ZERO,
            font: Font::new(include_bytes!(
                "/usr/share/fonts/mozilla-fira/FiraSans-Regular.otf"
            ))
            .unwrap(),
            // font: Font::new(include_bytes!("/usr/share/fonts/TTF/FiraSans-Regular.ttf")).unwrap(),
            last_draw: Instant::now(),
            modifiers: ModifiersState::default(),
            dragging: None,
            line_height,
            last_height: 720.0,
            scroll_pixels_multiplier,
            scroll_lines_multiplier,
            scroll_pages_multiplier,
        }
    }
}

/// the trait implemented by all Gui elements.
/// feel free to override the methods you wish to use.
#[allow(unused)]
pub trait GuiElemTrait {
    fn config(&self) -> &GuiElemCfg;
    fn config_mut(&mut self) -> &mut GuiElemCfg;
    /// note: drawing happens from the last to the first element, while priority is from first to last.
    /// if you wish to add a "high priority" child to a Vec<GuiElem> using push, .rev() the iterator in this method.
    fn children(&mut self) -> Box<dyn Iterator<Item = &mut GuiElem> + '_>;
    fn any(&self) -> &dyn Any;
    fn any_mut(&mut self) -> &mut dyn Any;
    fn clone_gui(&self) -> Box<dyn GuiElemTrait>;
    /// handles drawing.
    fn draw(&mut self, info: &mut DrawInfo, g: &mut Graphics2D) {}
    /// an event that is invoked whenever a mouse button is pressed on the element.
    fn mouse_down(&mut self, button: MouseButton) -> Vec<GuiAction> {
        Vec::with_capacity(0)
    }
    /// an event that is invoked whenever a mouse button that was pressed on the element is released anywhere.
    fn mouse_up(&mut self, button: MouseButton) -> Vec<GuiAction> {
        Vec::with_capacity(0)
    }
    /// an event that is invoked after a mouse button was pressed and released on the same GUI element.
    fn mouse_pressed(&mut self, button: MouseButton) -> Vec<GuiAction> {
        Vec::with_capacity(0)
    }
    fn mouse_wheel(&mut self, diff: f32) -> Vec<GuiAction> {
        Vec::with_capacity(0)
    }
    fn char_watch(&mut self, modifiers: ModifiersState, key: char) -> Vec<GuiAction> {
        Vec::with_capacity(0)
    }
    fn char_focus(&mut self, modifiers: ModifiersState, key: char) -> Vec<GuiAction> {
        Vec::with_capacity(0)
    }
    fn key_watch(
        &mut self,
        modifiers: ModifiersState,
        down: bool,
        key: Option<VirtualKeyCode>,
        scan: KeyScancode,
    ) -> Vec<GuiAction> {
        Vec::with_capacity(0)
    }
    fn key_focus(
        &mut self,
        modifiers: ModifiersState,
        down: bool,
        key: Option<VirtualKeyCode>,
        scan: KeyScancode,
    ) -> Vec<GuiAction> {
        Vec::with_capacity(0)
    }
    /// When something is dragged and released over this element
    fn dragged(&mut self, dragged: Dragging) -> Vec<GuiAction> {
        Vec::with_capacity(0)
    }
    fn updated_library(&mut self) {}
    fn updated_queue(&mut self) {}
}

#[derive(Debug, Clone)]
pub struct GuiElemCfg {
    pub enabled: bool,
    /// if true, indicates that something (text size, screen size, ...) has changed
    /// and you should probably relayout and redraw from scratch.
    pub redraw: bool,
    pub pos: Rectangle,
    /// the pixel position after the last call to draw().
    /// in draw, use info.pos instead, as pixel_pos is only updated *after* draw().
    /// this can act like a "previous pos" field within draw.
    pub pixel_pos: Rectangle,
    pub mouse_down: (bool, bool, bool),
    pub mouse_events: bool,
    pub scroll_events: bool,
    /// allows elements to watch all keyboard events, regardless of keyboard focus.
    pub keyboard_events_watch: bool,
    /// indicates that this element can have the keyboard focus
    pub keyboard_events_focus: bool,
    /// index of the child that has keyboard focus. if usize::MAX, `self` has focus.
    /// will automatically be changed when Tab is pressed. [TODO]
    pub keyboard_focus_index: usize,
    pub request_keyboard_focus: bool,
    pub drag_target: bool,
}
impl GuiElemCfg {
    pub fn at(pos: Rectangle) -> Self {
        Self {
            pos,
            ..Default::default()
        }
    }
    pub fn w_mouse(mut self) -> Self {
        self.mouse_events = true;
        self
    }
    pub fn w_scroll(mut self) -> Self {
        self.scroll_events = true;
        self
    }
    pub fn w_keyboard_watch(mut self) -> Self {
        self.keyboard_events_watch = true;
        self
    }
    pub fn w_keyboard_focus(mut self) -> Self {
        self.keyboard_events_focus = true;
        self
    }
    pub fn w_drag_target(mut self) -> Self {
        self.drag_target = true;
        self
    }
    pub fn disabled(mut self) -> Self {
        self.enabled = false;
        self
    }
}
impl Default for GuiElemCfg {
    fn default() -> Self {
        Self {
            enabled: true,
            redraw: false,
            pos: Rectangle::new(Vec2::ZERO, Vec2::new(1.0, 1.0)),
            pixel_pos: Rectangle::ZERO,
            mouse_down: (false, false, false),
            mouse_events: false,
            scroll_events: false,
            keyboard_events_watch: false,
            keyboard_events_focus: false,
            keyboard_focus_index: usize::MAX,
            request_keyboard_focus: false,
            drag_target: false,
        }
    }
}
pub enum GuiAction {
    OpenMain,
    SetIdle(bool),
    OpenSettings(bool),
    Build(Box<dyn FnOnce(&mut Database) -> Vec<Self>>),
    SendToServer(Command),
    /// unfocuses all gui elements, then assigns keyboard focus to one with config().request_keyboard_focus == true.
    ResetKeyboardFocus,
    SetDragging(
        Option<(
            Dragging,
            Option<Box<dyn FnMut(&mut DrawInfo, &mut Graphics2D)>>,
        )>,
    ),
    SetLineHeight(f32),
    Do(Box<dyn FnMut(&mut Gui)>),
    Exit,
}
pub enum Dragging {
    Artist(ArtistId),
    Album(AlbumId),
    Song(SongId),
    Queue(Queue),
}
pub struct DrawInfo<'a> {
    pub actions: Vec<GuiAction>,
    pub pos: Rectangle,
    pub database: &'a mut Database,
    pub font: &'a Font,
    /// absolute position of the mouse on the screen.
    /// compare this to `pos` to find the mouse's relative position.
    pub mouse_pos: Vec2,
    pub helper: Option<&'a mut WindowHelper<GuiEvent>>,
    pub has_keyboard_focus: bool,
    pub child_has_keyboard_focus: bool,
    /// the height of one line of text (in pixels)
    pub line_height: f32,
}

pub struct GuiElem {
    pub inner: Box<dyn GuiElemTrait>,
}
impl Clone for GuiElem {
    fn clone(&self) -> Self {
        Self {
            inner: self.inner.clone_gui(),
        }
    }
}
impl GuiElem {
    pub fn new<T: GuiElemTrait + 'static>(inner: T) -> Self {
        Self {
            inner: Box::new(inner),
        }
    }
    pub fn try_as<T: Any>(&self) -> Option<&T> {
        self.inner.any().downcast_ref()
    }
    pub fn try_as_mut<T: Any>(&mut self) -> Option<&mut T> {
        self.inner.any_mut().downcast_mut()
    }
    pub fn draw(&mut self, info: &mut DrawInfo, g: &mut Graphics2D) {
        if !self.inner.config_mut().enabled {
            return;
        }
        // adjust info
        let npos = adjust_area(&info.pos, &self.inner.config_mut().pos);
        let ppos = std::mem::replace(&mut info.pos, npos);
        if info.child_has_keyboard_focus {
            if self.inner.config().keyboard_focus_index == usize::MAX {
                info.has_keyboard_focus = true;
                info.child_has_keyboard_focus = false;
            }
        }
        // call trait's draw function
        self.inner.draw(info, g);
        // reset info
        info.has_keyboard_focus = false;
        let focus_path = info.child_has_keyboard_focus;
        // children (in reverse order - first element has the highest priority)
        let kbd_focus_index = self.inner.config().keyboard_focus_index;
        for (i, c) in self
            .inner
            .children()
            .collect::<Vec<_>>()
            .into_iter()
            .enumerate()
            .rev()
        {
            info.child_has_keyboard_focus = focus_path && i == kbd_focus_index;
            c.draw(info, g);
        }
        // reset pt. 2
        info.child_has_keyboard_focus = focus_path;
        self.inner.config_mut().pixel_pos = std::mem::replace(&mut info.pos, ppos);
    }
    /// recursively applies the function to all gui elements below and including this one
    pub fn recursive_all<F: FnMut(&mut GuiElem)>(&mut self, f: &mut F) {
        f(self);
        for c in self.inner.children() {
            c.recursive_all(f);
        }
    }
    fn mouse_event<F: FnMut(&mut GuiElem) -> Option<Vec<GuiAction>>>(
        &mut self,
        condition: &mut F,
        pos: Vec2,
    ) -> Option<Vec<GuiAction>> {
        for c in &mut self.inner.children() {
            if c.inner.config().enabled {
                if c.inner.config().pixel_pos.contains(pos) {
                    if let Some(v) = c.mouse_event(condition, pos) {
                        return Some(v);
                    }
                }
            }
        }
        condition(self)
    }
    fn release_drag(
        &mut self,
        dragged: &mut Option<Dragging>,
        pos: Vec2,
    ) -> Option<Vec<GuiAction>> {
        self.mouse_event(
            &mut |v| {
                if v.inner.config().drag_target {
                    if let Some(d) = dragged.take() {
                        return Some(v.inner.dragged(d));
                    }
                }
                None
            },
            pos,
        )
    }
    fn mouse_button(
        &mut self,
        button: MouseButton,
        down: bool,
        pos: Vec2,
    ) -> Option<Vec<GuiAction>> {
        if down {
            self.mouse_event(
                &mut |v: &mut GuiElem| {
                    if v.inner.config().mouse_events {
                        match button {
                            MouseButton::Left => v.inner.config_mut().mouse_down.0 = true,
                            MouseButton::Middle => v.inner.config_mut().mouse_down.1 = true,
                            MouseButton::Right => v.inner.config_mut().mouse_down.2 = true,
                            MouseButton::Other(_) => {}
                        }
                        Some(v.inner.mouse_down(button))
                    } else {
                        None
                    }
                },
                pos,
            )
        } else {
            let mut vec = vec![];
            if let Some(a) = self.mouse_event(
                &mut |v: &mut GuiElem| {
                    let down = v.inner.config().mouse_down;
                    if v.inner.config().mouse_events
                        && ((button == MouseButton::Left && down.0)
                            || (button == MouseButton::Middle && down.1)
                            || (button == MouseButton::Right && down.2))
                    {
                        Some(v.inner.mouse_pressed(button))
                    } else {
                        None
                    }
                },
                pos,
            ) {
                vec.extend(a);
            };
            self.recursive_all(&mut |v| {
                if v.inner.config().mouse_events {
                    match button {
                        MouseButton::Left => v.inner.config_mut().mouse_down.0 = false,
                        MouseButton::Middle => v.inner.config_mut().mouse_down.1 = false,
                        MouseButton::Right => v.inner.config_mut().mouse_down.2 = false,
                        MouseButton::Other(_) => {}
                    }
                    vec.extend(v.inner.mouse_up(button));
                }
            });
            Some(vec)
        }
    }
    fn mouse_wheel(&mut self, diff: f32, pos: Vec2) -> Option<Vec<GuiAction>> {
        self.mouse_event(
            &mut |v| {
                if v.inner.config().scroll_events {
                    Some(v.inner.mouse_wheel(diff))
                } else {
                    None
                }
            },
            pos,
        )
    }
    fn keyboard_event<
        F: FnOnce(&mut Self, &mut Vec<GuiAction>),
        G: FnMut(&mut Self, &mut Vec<GuiAction>),
    >(
        &mut self,
        f_focus: F,
        mut f_watch: G,
    ) -> Vec<GuiAction> {
        let mut o = vec![];
        self.keyboard_event_inner(&mut Some(f_focus), &mut f_watch, &mut o, true);
        o
    }
    fn keyboard_event_inner<
        F: FnOnce(&mut Self, &mut Vec<GuiAction>),
        G: FnMut(&mut Self, &mut Vec<GuiAction>),
    >(
        &mut self,
        f_focus: &mut Option<F>,
        f_watch: &mut G,
        events: &mut Vec<GuiAction>,
        focus: bool,
    ) {
        f_watch(self, events);
        let focus_index = self.inner.config().keyboard_focus_index;
        for (i, child) in self.inner.children().enumerate() {
            child.keyboard_event_inner(f_focus, f_watch, events, focus && i == focus_index);
        }
        if focus {
            // we have focus and no child has consumed f_focus
            if let Some(f) = f_focus.take() {
                f(self, events)
            }
        }
    }
    fn keyboard_move_focus(&mut self, decrement: bool, refocus: bool) -> bool {
        let mut focus_index = if refocus {
            usize::MAX
        } else {
            self.inner.config().keyboard_focus_index
        };
        let allow_focus = self.inner.config().keyboard_events_focus;
        let mut children = self.inner.children().collect::<Vec<_>>();
        if focus_index == usize::MAX {
            if decrement {
                focus_index = children.len().saturating_sub(1);
            } else {
                focus_index = 0;
            }
        }
        let mut changed = refocus;
        let ok = loop {
            if let Some(child) = children.get_mut(focus_index) {
                if child.keyboard_move_focus(decrement, changed) {
                    break true;
                } else {
                    changed = true;
                    if !decrement {
                        focus_index += 1;
                    } else {
                        focus_index = focus_index.wrapping_sub(1);
                    }
                }
            } else {
                focus_index = usize::MAX;
                break allow_focus && refocus;
            }
        };
        self.inner.config_mut().keyboard_focus_index = focus_index;
        ok
    }
    fn keyboard_reset_focus(&mut self) -> bool {
        let mut index = usize::MAX;
        for (i, c) in self.inner.children().enumerate() {
            if c.keyboard_reset_focus() {
                index = i;
                break;
            }
        }
        let wants = std::mem::replace(&mut self.inner.config_mut().request_keyboard_focus, false);
        self.inner.config_mut().keyboard_focus_index = index;
        index != usize::MAX || wants
    }
}

pub fn adjust_area(outer: &Rectangle, rel_area: &Rectangle) -> Rectangle {
    Rectangle::new(
        adjust_pos(outer, rel_area.top_left()),
        adjust_pos(outer, rel_area.bottom_right()),
    )
}
pub fn adjust_pos(outer: &Rectangle, rel_pos: &Vec2) -> Vec2 {
    Vec2::new(
        outer.top_left().x + outer.width() * rel_pos.x,
        outer.top_left().y + outer.height() * rel_pos.y,
    )
}

impl Gui {
    fn exec_gui_action(&mut self, action: GuiAction) {
        match action {
            GuiAction::Build(f) => {
                let actions = f(&mut *self.database.lock().unwrap());
                for action in actions {
                    self.exec_gui_action(action);
                }
            }
            GuiAction::SendToServer(cmd) => {
                if let Err(e) = cmd.to_bytes(&mut self.connection) {
                    eprintln!("Error sending command to server: {e}");
                }
            }
            GuiAction::ResetKeyboardFocus => _ = self.gui.keyboard_reset_focus(),
            GuiAction::SetDragging(d) => self.dragging = d,
            GuiAction::SetLineHeight(h) => {
                self.line_height = h;
                self.gui
                    .recursive_all(&mut |e| e.inner.config_mut().redraw = true);
            }
            GuiAction::Do(mut f) => f(self),
            GuiAction::Exit => _ = self.event_sender.send_event(GuiEvent::Exit),
            GuiAction::SetIdle(v) => {
                if let Some(gui) = self
                    .gui
                    .inner
                    .any_mut()
                    .downcast_mut::<WithFocusHotkey<GuiScreen>>()
                {
                    if gui.inner.idle.0 != v {
                        gui.inner.idle = (v, Some(Instant::now()));
                    }
                }
            }
            GuiAction::OpenSettings(v) => {
                if let Some(gui) = self
                    .gui
                    .inner
                    .any_mut()
                    .downcast_mut::<WithFocusHotkey<GuiScreen>>()
                {
                    if gui.inner.idle.0 {
                        gui.inner.idle = (false, Some(Instant::now()));
                    }
                    if gui.inner.settings.0 != v {
                        gui.inner.settings = (v, Some(Instant::now()));
                    }
                }
            }
            GuiAction::OpenMain => {
                if let Some(gui) = self
                    .gui
                    .inner
                    .any_mut()
                    .downcast_mut::<WithFocusHotkey<GuiScreen>>()
                {
                    if gui.inner.idle.0 {
                        gui.inner.idle = (false, Some(Instant::now()));
                    }
                    if gui.inner.settings.0 {
                        gui.inner.settings = (false, Some(Instant::now()));
                    }
                }
            }
        }
    }
}
impl WindowHandler<GuiEvent> for Gui {
    fn on_draw(&mut self, helper: &mut WindowHelper<GuiEvent>, graphics: &mut Graphics2D) {
        let start = Instant::now();
        graphics.draw_rectangle(
            Rectangle::new(Vec2::ZERO, self.size.into_f32()),
            Color::BLACK,
        );
        let mut dblock = self.database.lock().unwrap();
        let mut info = DrawInfo {
            actions: Vec::with_capacity(0),
            pos: Rectangle::new(Vec2::ZERO, self.size.into_f32()),
            database: &mut *dblock,
            font: &self.font,
            mouse_pos: self.mouse_pos,
            helper: Some(helper),
            has_keyboard_focus: false,
            child_has_keyboard_focus: true,
            line_height: self.line_height,
        };
        self.gui.draw(&mut info, graphics);
        let actions = std::mem::replace(&mut info.actions, Vec::with_capacity(0));
        if let Some((d, f)) = &mut self.dragging {
            if let Some(f) = f {
                f(&mut info, graphics);
            } else {
                match d {
                    Dragging::Artist(_) => graphics.draw_circle(
                        self.mouse_pos,
                        25.0,
                        Color::from_int_rgba(0, 100, 255, 100),
                    ),
                    Dragging::Album(_) => graphics.draw_circle(
                        self.mouse_pos,
                        25.0,
                        Color::from_int_rgba(0, 100, 255, 100),
                    ),
                    Dragging::Song(_) => graphics.draw_circle(
                        self.mouse_pos,
                        25.0,
                        Color::from_int_rgba(0, 100, 255, 100),
                    ),
                    Dragging::Queue(_) => graphics.draw_circle(
                        self.mouse_pos,
                        25.0,
                        Color::from_int_rgba(100, 0, 255, 100),
                    ),
                }
            }
        }
        drop(info);
        drop(dblock);
        for a in actions {
            self.exec_gui_action(a);
        }
        // eprintln!(
        //     "fps <= {}",
        //     1000 / self.last_draw.elapsed().as_millis().max(1)
        // );
        self.last_draw = start;
    }
    fn on_mouse_button_down(&mut self, helper: &mut WindowHelper<GuiEvent>, button: MouseButton) {
        if let Some(a) = self.gui.mouse_button(button, true, self.mouse_pos.clone()) {
            for a in a {
                self.exec_gui_action(a)
            }
        }
        helper.request_redraw();
    }
    fn on_mouse_button_up(&mut self, helper: &mut WindowHelper<GuiEvent>, button: MouseButton) {
        if self.dragging.is_some() {
            if let Some(a) = self.gui.release_drag(
                &mut self.dragging.take().map(|v| v.0),
                self.mouse_pos.clone(),
            ) {
                for a in a {
                    self.exec_gui_action(a)
                }
            }
        }
        if let Some(a) = self.gui.mouse_button(button, false, self.mouse_pos.clone()) {
            for a in a {
                self.exec_gui_action(a)
            }
        }
        helper.request_redraw();
    }
    fn on_mouse_wheel_scroll(
        &mut self,
        helper: &mut WindowHelper<GuiEvent>,
        distance: speedy2d::window::MouseScrollDistance,
    ) {
        let dist = match distance {
            MouseScrollDistance::Pixels { y, .. } => (self.scroll_pixels_multiplier * y) as f32,
            MouseScrollDistance::Lines { y, .. } => {
                (self.scroll_lines_multiplier * y) as f32 * self.line_height
            }
            MouseScrollDistance::Pages { y, .. } => {
                (self.scroll_pages_multiplier * y) as f32 * self.last_height
            }
        };
        if let Some(a) = self.gui.mouse_wheel(dist, self.mouse_pos.clone()) {
            for a in a {
                self.exec_gui_action(a)
            }
        }
        helper.request_redraw();
    }
    fn on_keyboard_char(&mut self, helper: &mut WindowHelper<GuiEvent>, unicode_codepoint: char) {
        helper.request_redraw();
        for a in self.gui.keyboard_event(
            |e, a| {
                if e.inner.config().keyboard_events_focus {
                    a.append(
                        &mut e
                            .inner
                            .char_focus(self.modifiers.clone(), unicode_codepoint),
                    );
                }
            },
            |e, a| {
                if e.inner.config().keyboard_events_watch {
                    a.append(
                        &mut e
                            .inner
                            .char_watch(self.modifiers.clone(), unicode_codepoint),
                    );
                }
            },
        ) {
            self.exec_gui_action(a);
        }
    }
    fn on_key_down(
        &mut self,
        helper: &mut WindowHelper<GuiEvent>,
        virtual_key_code: Option<VirtualKeyCode>,
        scancode: KeyScancode,
    ) {
        helper.request_redraw();
        if let Some(VirtualKeyCode::Tab) = virtual_key_code {
            if !(self.modifiers.ctrl() || self.modifiers.alt() || self.modifiers.logo()) {
                self.gui.keyboard_move_focus(self.modifiers.shift(), false);
            }
        }
        for a in self.gui.keyboard_event(
            |e, a| {
                if e.inner.config().keyboard_events_focus {
                    a.append(&mut e.inner.key_focus(
                        self.modifiers.clone(),
                        true,
                        virtual_key_code,
                        scancode,
                    ));
                }
            },
            |e, a| {
                if e.inner.config().keyboard_events_watch {
                    a.append(&mut e.inner.key_watch(
                        self.modifiers.clone(),
                        true,
                        virtual_key_code,
                        scancode,
                    ));
                }
            },
        ) {
            self.exec_gui_action(a);
        }
    }
    fn on_key_up(
        &mut self,
        helper: &mut WindowHelper<GuiEvent>,
        virtual_key_code: Option<VirtualKeyCode>,
        scancode: KeyScancode,
    ) {
        helper.request_redraw();
        for a in self.gui.keyboard_event(
            |e, a| {
                if e.inner.config().keyboard_events_focus {
                    a.append(&mut e.inner.key_focus(
                        self.modifiers.clone(),
                        false,
                        virtual_key_code,
                        scancode,
                    ));
                }
            },
            |e, a| {
                if e.inner.config().keyboard_events_watch {
                    a.append(&mut e.inner.key_watch(
                        self.modifiers.clone(),
                        false,
                        virtual_key_code,
                        scancode,
                    ));
                }
            },
        ) {
            self.exec_gui_action(a);
        }
    }
    fn on_keyboard_modifiers_changed(
        &mut self,
        _helper: &mut WindowHelper<GuiEvent>,
        state: ModifiersState,
    ) {
        self.modifiers = state;
    }
    fn on_user_event(&mut self, helper: &mut WindowHelper<GuiEvent>, user_event: GuiEvent) {
        match user_event {
            GuiEvent::Refresh => helper.request_redraw(),
            GuiEvent::UpdatedLibrary => {
                self.gui.recursive_all(&mut |e| e.inner.updated_library());
                helper.request_redraw();
            }
            GuiEvent::UpdatedQueue => {
                self.gui.recursive_all(&mut |e| e.inner.updated_queue());
                helper.request_redraw();
            }
            GuiEvent::Exit => helper.terminate_loop(),
        }
    }
    fn on_mouse_move(&mut self, helper: &mut WindowHelper<GuiEvent>, position: Vec2) {
        self.mouse_pos = position;
        helper.request_redraw();
    }
    fn on_resize(&mut self, _helper: &mut WindowHelper<GuiEvent>, size_pixels: UVec2) {
        self.size = size_pixels;
        self.gui
            .recursive_all(&mut |e| e.inner.config_mut().redraw = true);
    }
}