use std::{
    cmp::Ordering,
    rc::Rc,
    sync::{atomic::AtomicBool, Arc},
};

use musicdb_lib::data::{
    album::Album, artist::Artist, database::Database, song::Song, AlbumId, ArtistId, SongId,
};
use regex::{Regex, RegexBuilder};
use speedy2d::{
    color::Color,
    dimen::Vec2,
    shape::Rectangle,
    window::{MouseButton, VirtualKeyCode},
};

use crate::{
    gui::{Dragging, DrawInfo, GuiAction, GuiElem, GuiElemCfg, GuiElemTrait},
    gui_base::{Button, Panel, ScrollBox},
    gui_edit::GuiEdit,
    gui_text::{Label, TextField},
    gui_wrappers::WithFocusHotkey,
};

/*

This is responsible for showing the library,
with Regex search and drag-n-drop.

*/

#[derive(Clone)]
pub struct LibraryBrowser {
    config: GuiElemCfg,
    pub children: Vec<GuiElem>,
    // - - -
    library_sorted: Vec<(ArtistId, Vec<SongId>, Vec<(AlbumId, Vec<SongId>)>)>,
    library_filtered: Vec<(
        ArtistId,
        Vec<(SongId, f32)>,
        Vec<(AlbumId, Vec<(SongId, f32)>, f32)>,
        f32,
    )>,
    // - - -
    search_artist: String,
    search_artist_regex: Option<Regex>,
    search_album: String,
    search_album_regex: Option<Regex>,
    search_song: String,
    search_song_regex: Option<Regex>,
    filter_target_state: Rc<AtomicBool>,
    filter_state: f32,
    library_updated: bool,
    search_settings_changed: Rc<AtomicBool>,
    search_is_case_sensitive: Rc<AtomicBool>,
    search_was_case_sensitive: bool,
    search_prefer_start_matches: Rc<AtomicBool>,
    search_prefers_start_matches: bool,
}
fn search_regex_new(pat: &str, case_insensitive: bool) -> Result<Option<Regex>, regex::Error> {
    if pat.is_empty() {
        Ok(None)
    } else {
        Ok(Some(
            RegexBuilder::new(pat)
                .unicode(true)
                .case_insensitive(case_insensitive)
                .build()?,
        ))
    }
}
const LP_LIB1: f32 = 0.1;
const LP_LIB2: f32 = 1.0;
const LP_LIB1S: f32 = 0.4;
impl LibraryBrowser {
    pub fn new(config: GuiElemCfg) -> Self {
        let search_artist = TextField::new(
            GuiElemCfg::at(Rectangle::from_tuples((0.01, 0.01), (0.45, 0.05))),
            "artist".to_string(),
            Color::GRAY,
            Color::WHITE,
        );
        let search_album = TextField::new(
            GuiElemCfg::at(Rectangle::from_tuples((0.55, 0.01), (0.99, 0.05))),
            "album".to_string(),
            Color::GRAY,
            Color::WHITE,
        );
        let search_song = WithFocusHotkey::new_ctrl(
            VirtualKeyCode::F,
            TextField::new(
                GuiElemCfg::at(Rectangle::from_tuples((0.01, 0.06), (0.99, 0.1))),
                "song".to_string(),
                Color::GRAY,
                Color::WHITE,
            ),
        );
        let library_scroll_box = ScrollBox::new(
            GuiElemCfg::at(Rectangle::from_tuples((0.0, LP_LIB1), (1.0, LP_LIB2))),
            crate::gui_base::ScrollBoxSizeUnit::Pixels,
            vec![],
        );
        let search_settings_changed = Rc::new(AtomicBool::new(false));
        let search_was_case_sensitive = false;
        let search_is_case_sensitive = Rc::new(AtomicBool::new(search_was_case_sensitive));
        let search_prefers_start_matches = true;
        let search_prefer_start_matches = Rc::new(AtomicBool::new(search_prefers_start_matches));
        let filter_target_state = Rc::new(AtomicBool::new(false));
        let fts = Rc::clone(&filter_target_state);
        let filter_button = Button::new(
            GuiElemCfg::at(Rectangle::from_tuples((0.46, 0.01), (0.54, 0.05))),
            move |_| {
                fts.store(
                    !fts.load(std::sync::atomic::Ordering::Relaxed),
                    std::sync::atomic::Ordering::Relaxed,
                );
                vec![]
            },
            vec![GuiElem::new(Label::new(
                GuiElemCfg::default(),
                "more".to_owned(),
                Color::GRAY,
                None,
                Vec2::new(0.5, 0.5),
            ))],
        );
        Self {
            config,
            children: vec![
                GuiElem::new(search_artist),
                GuiElem::new(search_album),
                GuiElem::new(search_song),
                GuiElem::new(library_scroll_box),
                GuiElem::new(filter_button),
                GuiElem::new(FilterPanel::new(
                    Rc::clone(&search_settings_changed),
                    Rc::clone(&search_is_case_sensitive),
                    Rc::clone(&search_prefer_start_matches),
                )),
            ],
            // - - -
            library_sorted: vec![],
            library_filtered: vec![],
            // - - -
            search_artist: String::new(),
            search_artist_regex: None,
            search_album: String::new(),
            search_album_regex: None,
            search_song: String::new(),
            search_song_regex: None,
            filter_target_state,
            filter_state: 0.0,
            library_updated: true,
            search_settings_changed,
            search_is_case_sensitive,
            search_was_case_sensitive,
            search_prefer_start_matches,
            search_prefers_start_matches,
        }
    }
}
impl GuiElemTrait for LibraryBrowser {
    fn config(&self) -> &GuiElemCfg {
        &self.config
    }
    fn config_mut(&mut self) -> &mut GuiElemCfg {
        &mut self.config
    }
    fn children(&mut self) -> Box<dyn Iterator<Item = &mut GuiElem> + '_> {
        Box::new(self.children.iter_mut())
    }
    fn any(&self) -> &dyn std::any::Any {
        self
    }
    fn any_mut(&mut self) -> &mut dyn std::any::Any {
        self
    }
    fn clone_gui(&self) -> Box<dyn GuiElemTrait> {
        Box::new(self.clone())
    }
    fn draw(&mut self, info: &mut DrawInfo, _g: &mut speedy2d::Graphics2D) {
        // search
        let mut search_changed = false;
        let mut rebuild_regex = false;
        if self
            .search_settings_changed
            .load(std::sync::atomic::Ordering::Relaxed)
        {
            search_changed = true;
            self.search_settings_changed
                .store(false, std::sync::atomic::Ordering::Relaxed);
            let case_sensitive = self
                .search_is_case_sensitive
                .load(std::sync::atomic::Ordering::Relaxed);
            if self.search_was_case_sensitive != case_sensitive {
                self.search_was_case_sensitive = case_sensitive;
                rebuild_regex = true;
            }
            let pref_start = self
                .search_prefer_start_matches
                .load(std::sync::atomic::Ordering::Relaxed);
            if self.search_prefers_start_matches != pref_start {
                self.search_prefers_start_matches = pref_start;
            }
        }
        {
            let v = &mut self.children[0].try_as_mut::<TextField>().unwrap().children[0]
                .try_as_mut::<Label>()
                .unwrap()
                .content;
            if rebuild_regex || v.will_redraw() && self.search_artist != *v.get_text() {
                search_changed = true;
                self.search_artist = v.get_text().clone();
                self.search_artist_regex =
                    search_regex_new(&self.search_artist, !self.search_was_case_sensitive)
                        .ok()
                        .flatten();
                *v.color() = if self.search_artist_regex.is_some() {
                    Color::WHITE
                } else {
                    Color::RED
                };
            }
        }
        {
            let v = &mut self.children[1].try_as_mut::<TextField>().unwrap().children[0]
                .try_as_mut::<Label>()
                .unwrap()
                .content;
            if rebuild_regex || v.will_redraw() && self.search_album != *v.get_text() {
                search_changed = true;
                self.search_album = v.get_text().clone();
                self.search_album_regex =
                    search_regex_new(&self.search_album, !self.search_was_case_sensitive)
                        .ok()
                        .flatten();
                *v.color() = if self.search_album_regex.is_some() {
                    Color::WHITE
                } else {
                    Color::RED
                };
            }
        }
        {
            let v = &mut self.children[2]
                .try_as_mut::<WithFocusHotkey<TextField>>()
                .unwrap()
                .inner
                .children[0]
                .try_as_mut::<Label>()
                .unwrap()
                .content;
            if rebuild_regex || v.will_redraw() && self.search_song != *v.get_text() {
                search_changed = true;
                self.search_song = v.get_text().clone();
                self.search_song_regex =
                    search_regex_new(&self.search_song, !self.search_was_case_sensitive)
                        .ok()
                        .flatten();
                *v.color() = if self.search_song_regex.is_some() {
                    Color::WHITE
                } else {
                    Color::RED
                };
            }
        }
        // filter panel
        let filter_target_state = self
            .filter_target_state
            .load(std::sync::atomic::Ordering::Relaxed);
        let draw_filter = if filter_target_state && self.filter_state != 1.0 {
            if let Some(h) = &info.helper {
                h.request_redraw();
            }
            self.filter_state += (1.0 - self.filter_state) * 0.2;
            if self.filter_state > 0.999 {
                self.filter_state = 1.0;
            }
            true
        } else if !filter_target_state && self.filter_state != 0.0 {
            if let Some(h) = &info.helper {
                h.request_redraw();
            }
            self.filter_state *= 0.8;
            if self.filter_state < 0.001 {
                self.filter_state = 0.0;
            }
            true
        } else {
            false
        };
        if draw_filter {
            let y = LP_LIB1 + (LP_LIB1S - LP_LIB1) * self.filter_state;
            self.children[3]
                .try_as_mut::<ScrollBox>()
                .unwrap()
                .config_mut()
                .pos = Rectangle::new(Vec2::new(0.0, y), Vec2::new(1.0, LP_LIB2));
            let filter_panel = self.children[5].try_as_mut::<FilterPanel>().unwrap();
            filter_panel.config_mut().pos =
                Rectangle::new(Vec2::new(0.0, LP_LIB1), Vec2::new(1.0, y));
            filter_panel.config.enabled = self.filter_state > 0.0;
        }
        // -
        if self.library_updated {
            self.library_updated = false;
            self.update_local_library(&info.database, |(_, a), (_, b)| a.name.cmp(&b.name));
            search_changed = true;
        }
        if search_changed {
            fn filter(
                s: &LibraryBrowser,
                pat: &str,
                regex: &Option<Regex>,
                search_text: &String,
            ) -> f32 {
                if let Some(r) = regex {
                    if s.search_prefers_start_matches {
                        r.find_iter(pat)
                            .map(|m| match pat[0..m.start()].chars().rev().next() {
                                // found at the start of h, reaches to the end (whole pattern is part of the match)
                                None if m.end() == pat.len() => 6.0,
                                // found at start of h
                                None => 4.0,
                                Some(ch) if ch.is_whitespace() => match pat[m.end()..].chars().next() {
                                    // whole word matches
                                    None => 5.0,
                                    Some(ch) if ch.is_whitespace() => 5.0,
                                    // found after whitespace in h
                                    Some(_) = 3.0,
                                },
                                // found somewhere else in h
                                _ => 2.0,
                            })
                            .fold(0.0, f32::max)
                    } else {
                        if r.is_match(pat) {
                            2.0
                        } else {
                            0.0
                        }
                    }
                } else if search_text.is_empty() {
                    1.0
                } else {
                    0.0
                }
            }
            self.filter_local_library(
                &info.database,
                |s, artist| filter(s, &artist.name, &s.search_artist_regex, &s.search_artist),
                |s, album| filter(s, &album.name, &s.search_album_regex, &s.search_album),
                |s, song| {
                    if song.album.is_some() || s.search_album.is_empty() {
                        filter(s, &song.title, &s.search_song_regex, &s.search_song)
                    } else {
                        0.0
                    }
                },
            );
            self.config.redraw = true;
        }
        if self.config.redraw || info.pos.size() != self.config.pixel_pos.size() {
            self.config.redraw = false;
            self.update_ui(&info.database, info.line_height);
        }
    }
    fn updated_library(&mut self) {
        self.library_updated = true;
    }
}
impl LibraryBrowser {
    /// Sets `self.library_sorted` based on the contents of the `Database`.
    fn update_local_library(
        &mut self,
        db: &Database,
        sort_artists: impl FnMut(&(&ArtistId, &Artist), &(&ArtistId, &Artist)) -> Ordering,
    ) {
        let mut artists = db.artists().iter().collect::<Vec<_>>();
        artists.sort_unstable_by(sort_artists);
        self.library_sorted = artists
            .into_iter()
            .map(|(ar_id, artist)| {
                let singles = artist.singles.iter().map(|id| *id).collect();
                let albums = artist
                    .albums
                    .iter()
                    .map(|id| {
                        let songs = if let Some(album) = db.albums().get(id) {
                            album.songs.iter().map(|id| *id).collect()
                        } else {
                            eprintln!("[warn] No album with id {id} found in db!");
                            vec![]
                        };
                        (*id, songs)
                    })
                    .collect();
                (*ar_id, singles, albums)
            })
            .collect();
    }
    /// Sets `self.library_filtered` using the value of `self.library_sorted` and filter functions.
    /// Return values of the filter functions:
    /// 0.0 -> don't show
    /// 1.0 -> neutral
    /// anything else -> priority (determines how things will be sorted)
    /// Album Value = max(Song Values) * AlbumFilterVal
    /// Artist Value = max(Album Values) * ArtistFilterVal
    fn filter_local_library(
        &mut self,
        db: &Database,
        filter_artist: impl Fn(&Self, &Artist) -> f32,
        filter_album: impl Fn(&Self, &Album) -> f32,
        filter_song: impl Fn(&Self, &Song) -> f32,
    ) {
        let mut a = vec![];
        for (artist_id, singles, albums) in self.library_sorted.iter() {
            if let Some(artist) = db.artists().get(artist_id) {
                let mut filterscore_artist = filter_artist(self, artist);
                if filterscore_artist > 0.0 {
                    let mut max_score_in_artist = 0.0;
                    if filterscore_artist > 0.0 {
                        let mut s = singles
                            .iter()
                            .filter_map(|song_id| {
                                if let Some(song) = db.songs().get(song_id) {
                                    let filterscore_song = filter_song(self, song);
                                    if filterscore_song > 0.0 {
                                        if filterscore_song > max_score_in_artist {
                                            max_score_in_artist = filterscore_song;
                                        }
                                        return Some((*song_id, filterscore_song));
                                    }
                                }
                                None
                            })
                            .collect::<Vec<_>>();
                        s.sort_by(|(.., a), (.., b)| b.partial_cmp(a).unwrap_or(Ordering::Equal));
                        let mut al = albums
                            .iter()
                            .filter_map(|(album_id, songs)| {
                                if let Some(album) = db.albums().get(album_id) {
                                    let mut filterscore_album = filter_album(self, album);
                                    if filterscore_album > 0.0 {
                                        let mut max_score_in_album = 0.0;
                                        let mut s = songs
                                            .iter()
                                            .filter_map(|song_id| {
                                                if let Some(song) = db.songs().get(song_id) {
                                                    let filterscore_song = filter_song(self, song);
                                                    if filterscore_song > 0.0 {
                                                        if filterscore_song > max_score_in_album {
                                                            max_score_in_album = filterscore_song;
                                                        }
                                                        return Some((*song_id, filterscore_song));
                                                    }
                                                }
                                                None
                                            })
                                            .collect::<Vec<_>>();
                                        s.sort_by(|(.., a), (.., b)| {
                                            b.partial_cmp(a).unwrap_or(Ordering::Equal)
                                        });
                                        filterscore_album *= max_score_in_album;
                                        if filterscore_album > 0.0 {
                                            if filterscore_album > max_score_in_artist {
                                                max_score_in_artist = filterscore_album;
                                            }
                                            return Some((*album_id, s, filterscore_album));
                                        }
                                    }
                                }
                                None
                            })
                            .collect::<Vec<_>>();
                        al.sort_by(|(.., a), (.., b)| b.partial_cmp(a).unwrap_or(Ordering::Equal));
                        filterscore_artist *= max_score_in_artist;
                        if filterscore_artist > 0.0 {
                            a.push((*artist_id, s, al, filterscore_artist));
                        }
                    }
                }
            }
        }
        a.sort_by(|(.., a), (.., b)| b.partial_cmp(a).unwrap_or(Ordering::Equal));
        self.library_filtered = a;
    }
    /// Sets the contents of the `ScrollBox` based on `self.library_filtered`.
    fn update_ui(&mut self, db: &Database, line_height: f32) {
        let mut elems = vec![];
        for (artist_id, singles, albums, _artist_filterscore) in self.library_filtered.iter() {
            elems.push(self.build_ui_element_artist(*artist_id, db, line_height));
            for (song_id, _song_filterscore) in singles {
                elems.push(self.build_ui_element_song(*song_id, db, line_height));
            }
            for (album_id, songs, _album_filterscore) in albums {
                elems.push(self.build_ui_element_album(*album_id, db, line_height));
                for (song_id, _song_filterscore) in songs {
                    elems.push(self.build_ui_element_song(*song_id, db, line_height));
                }
            }
        }
        let library_scroll_box = self.children[3].try_as_mut::<ScrollBox>().unwrap();
        library_scroll_box.children = elems;
        library_scroll_box.config_mut().redraw = true;
    }
    fn build_ui_element_artist(&self, id: ArtistId, db: &Database, h: f32) -> (GuiElem, f32) {
        (
            GuiElem::new(ListArtist::new(
                GuiElemCfg::default(),
                id,
                if let Some(v) = db.artists().get(&id) {
                    v.name.to_owned()
                } else {
                    format!("[ Artist #{id} ]")
                },
            )),
            h * 2.5,
        )
    }
    fn build_ui_element_album(&self, id: ArtistId, db: &Database, h: f32) -> (GuiElem, f32) {
        (
            GuiElem::new(ListAlbum::new(
                GuiElemCfg::default(),
                id,
                if let Some(v) = db.albums().get(&id) {
                    v.name.to_owned()
                } else {
                    format!("[ Album #{id} ]")
                },
            )),
            h * 1.5,
        )
    }
    fn build_ui_element_song(&self, id: ArtistId, db: &Database, h: f32) -> (GuiElem, f32) {
        (
            GuiElem::new(ListSong::new(
                GuiElemCfg::default(),
                id,
                if let Some(v) = db.songs().get(&id) {
                    v.title.to_owned()
                } else {
                    format!("[ Song #{id} ]")
                },
            )),
            h,
        )
    }
}

#[derive(Clone)]
struct ListArtist {
    config: GuiElemCfg,
    id: ArtistId,
    children: Vec<GuiElem>,
    mouse: bool,
    mouse_pos: Vec2,
}
impl ListArtist {
    pub fn new(config: GuiElemCfg, id: ArtistId, name: String) -> Self {
        let label = Label::new(
            GuiElemCfg::default(),
            name,
            Color::from_int_rgb(81, 24, 125),
            None,
            Vec2::new(0.0, 0.5),
        );
        Self {
            config: config.w_mouse(),
            id,
            children: vec![GuiElem::new(label)],
            mouse: false,
            mouse_pos: Vec2::ZERO,
        }
    }
}
impl GuiElemTrait for ListArtist {
    fn config(&self) -> &GuiElemCfg {
        &self.config
    }
    fn config_mut(&mut self) -> &mut GuiElemCfg {
        &mut self.config
    }
    fn children(&mut self) -> Box<dyn Iterator<Item = &mut GuiElem> + '_> {
        Box::new(self.children.iter_mut())
    }
    fn any(&self) -> &dyn std::any::Any {
        self
    }
    fn any_mut(&mut self) -> &mut dyn std::any::Any {
        self
    }
    fn clone_gui(&self) -> Box<dyn GuiElemTrait> {
        Box::new(self.clone())
    }
    fn draw(&mut self, info: &mut DrawInfo, _g: &mut speedy2d::Graphics2D) {
        if self.mouse {
            if info.pos.contains(info.mouse_pos) {
                return;
            } else {
                self.mouse = false;
            }
        }
        self.mouse_pos = Vec2::new(
            info.mouse_pos.x - info.pos.top_left().x,
            info.mouse_pos.y - info.pos.top_left().y,
        );
    }
    fn mouse_down(&mut self, button: MouseButton) -> Vec<GuiAction> {
        if button == MouseButton::Left {
            self.mouse = true;
            let mouse_pos = self.mouse_pos;
            let w = self.config.pixel_pos.width();
            let h = self.config.pixel_pos.height();
            let mut el = GuiElem::new(self.clone());
            vec![GuiAction::SetDragging(Some((
                Dragging::Artist(self.id),
                Some(Box::new(move |i, g| {
                    let sw = i.pos.width();
                    let sh = i.pos.height();
                    let x = (i.mouse_pos.x - mouse_pos.x) / sw;
                    let y = (i.mouse_pos.y - mouse_pos.y) / sh;
                    el.inner.config_mut().pos =
                        Rectangle::from_tuples((x, y), (x + w / sw, y + h / sh));
                    el.draw(i, g)
                })),
            )))]
        } else {
            vec![]
        }
    }
    fn mouse_up(&mut self, button: MouseButton) -> Vec<GuiAction> {
        if self.mouse && button == MouseButton::Left {
            self.mouse = false;
            vec![GuiAction::OpenEditPanel(GuiElem::new(GuiEdit::new(
                GuiElemCfg::default(),
                crate::gui_edit::Editable::Artist(vec![self.id]),
            )))]
        } else {
            vec![]
        }
    }
}

#[derive(Clone)]
struct ListAlbum {
    config: GuiElemCfg,
    id: AlbumId,
    children: Vec<GuiElem>,
    mouse: bool,
    mouse_pos: Vec2,
}
impl ListAlbum {
    pub fn new(config: GuiElemCfg, id: AlbumId, name: String) -> Self {
        let label = Label::new(
            GuiElemCfg::default(),
            name,
            Color::from_int_rgb(8, 61, 47),
            None,
            Vec2::new(0.0, 0.5),
        );
        Self {
            config: config.w_mouse(),
            id,
            children: vec![GuiElem::new(label)],
            mouse: false,
            mouse_pos: Vec2::ZERO,
        }
    }
}
impl GuiElemTrait for ListAlbum {
    fn config(&self) -> &GuiElemCfg {
        &self.config
    }
    fn config_mut(&mut self) -> &mut GuiElemCfg {
        &mut self.config
    }
    fn children(&mut self) -> Box<dyn Iterator<Item = &mut GuiElem> + '_> {
        Box::new(self.children.iter_mut())
    }
    fn any(&self) -> &dyn std::any::Any {
        self
    }
    fn any_mut(&mut self) -> &mut dyn std::any::Any {
        self
    }
    fn clone_gui(&self) -> Box<dyn GuiElemTrait> {
        Box::new(self.clone())
    }
    fn draw(&mut self, info: &mut DrawInfo, _g: &mut speedy2d::Graphics2D) {
        if self.mouse {
            if info.pos.contains(info.mouse_pos) {
                return;
            } else {
                self.mouse = false;
            }
        }
        self.mouse_pos = Vec2::new(
            info.mouse_pos.x - info.pos.top_left().x,
            info.mouse_pos.y - info.pos.top_left().y,
        );
    }
    fn mouse_down(&mut self, button: MouseButton) -> Vec<GuiAction> {
        if button == MouseButton::Left {
            self.mouse = true;
            let mouse_pos = self.mouse_pos;
            let w = self.config.pixel_pos.width();
            let h = self.config.pixel_pos.height();
            let mut el = GuiElem::new(self.clone());
            vec![GuiAction::SetDragging(Some((
                Dragging::Album(self.id),
                Some(Box::new(move |i, g| {
                    let sw = i.pos.width();
                    let sh = i.pos.height();
                    let x = (i.mouse_pos.x - mouse_pos.x) / sw;
                    let y = (i.mouse_pos.y - mouse_pos.y) / sh;
                    el.inner.config_mut().pos =
                        Rectangle::from_tuples((x, y), (x + w / sw, y + h / sh));
                    el.draw(i, g)
                })),
            )))]
        } else {
            vec![]
        }
    }
    fn mouse_up(&mut self, button: MouseButton) -> Vec<GuiAction> {
        if self.mouse && button == MouseButton::Left {
            self.mouse = false;
            vec![GuiAction::OpenEditPanel(GuiElem::new(GuiEdit::new(
                GuiElemCfg::default(),
                crate::gui_edit::Editable::Album(vec![self.id]),
            )))]
        } else {
            vec![]
        }
    }
}

#[derive(Clone)]
struct ListSong {
    config: GuiElemCfg,
    id: SongId,
    children: Vec<GuiElem>,
    mouse: bool,
    mouse_pos: Vec2,
}
impl ListSong {
    pub fn new(config: GuiElemCfg, id: SongId, name: String) -> Self {
        let label = Label::new(
            GuiElemCfg::default(),
            name,
            Color::from_int_rgb(175, 175, 175),
            None,
            Vec2::new(0.0, 0.5),
        );
        Self {
            config: config.w_mouse(),
            id,
            children: vec![GuiElem::new(label)],
            mouse: false,
            mouse_pos: Vec2::ZERO,
        }
    }
}
impl GuiElemTrait for ListSong {
    fn config(&self) -> &GuiElemCfg {
        &self.config
    }
    fn config_mut(&mut self) -> &mut GuiElemCfg {
        &mut self.config
    }
    fn children(&mut self) -> Box<dyn Iterator<Item = &mut GuiElem> + '_> {
        Box::new(self.children.iter_mut())
    }
    fn any(&self) -> &dyn std::any::Any {
        self
    }
    fn any_mut(&mut self) -> &mut dyn std::any::Any {
        self
    }
    fn clone_gui(&self) -> Box<dyn GuiElemTrait> {
        Box::new(self.clone())
    }
    fn draw(&mut self, info: &mut DrawInfo, _g: &mut speedy2d::Graphics2D) {
        if self.mouse {
            if info.pos.contains(info.mouse_pos) {
                return;
            } else {
                self.mouse = false;
            }
        }
        self.mouse_pos = Vec2::new(
            info.mouse_pos.x - info.pos.top_left().x,
            info.mouse_pos.y - info.pos.top_left().y,
        );
    }
    fn mouse_down(&mut self, button: MouseButton) -> Vec<GuiAction> {
        if button == MouseButton::Left {
            self.mouse = true;
            let mouse_pos = self.mouse_pos;
            let w = self.config.pixel_pos.width();
            let h = self.config.pixel_pos.height();
            let mut el = GuiElem::new(self.clone());
            vec![GuiAction::SetDragging(Some((
                Dragging::Song(self.id),
                Some(Box::new(move |i, g| {
                    let sw = i.pos.width();
                    let sh = i.pos.height();
                    let x = (i.mouse_pos.x - mouse_pos.x) / sw;
                    let y = (i.mouse_pos.y - mouse_pos.y) / sh;
                    el.inner.config_mut().pos =
                        Rectangle::from_tuples((x, y), (x + w / sw, y + h / sh));
                    el.draw(i, g)
                })),
            )))]
        } else {
            vec![]
        }
    }
    fn mouse_up(&mut self, button: MouseButton) -> Vec<GuiAction> {
        if self.mouse && button == MouseButton::Left {
            self.mouse = false;
            vec![GuiAction::OpenEditPanel(GuiElem::new(GuiEdit::new(
                GuiElemCfg::default(),
                crate::gui_edit::Editable::Song(vec![self.id]),
            )))]
        } else {
            vec![]
        }
    }
}

#[derive(Clone)]
struct FilterPanel {
    config: GuiElemCfg,
    children: Vec<GuiElem>,
    line_height: f32,
}
const FP_CASESENS_N: &'static str = "search is case-insensitive";
const FP_CASESENS_Y: &'static str = "search is case-sensitive!";
const FP_PREFSTART_N: &'static str = "simple search";
const FP_PREFSTART_Y: &'static str = "will prefer matches at the start of a word";
impl FilterPanel {
    pub fn new(
        search_settings_changed: Rc<AtomicBool>,
        search_is_case_sensitive: Rc<AtomicBool>,
        search_prefer_start_matches: Rc<AtomicBool>,
    ) -> Self {
        let is_case_sensitive = search_is_case_sensitive.load(std::sync::atomic::Ordering::Relaxed);
        let prefer_start_matches =
            search_prefer_start_matches.load(std::sync::atomic::Ordering::Relaxed);
        let ssc1 = Rc::clone(&search_settings_changed);
        let ssc2 = search_settings_changed;
        Self {
            config: GuiElemCfg::default().disabled(),
            children: vec![GuiElem::new(ScrollBox::new(
                GuiElemCfg::default(),
                crate::gui_base::ScrollBoxSizeUnit::Pixels,
                vec![
                    (
                        GuiElem::new(Button::new(
                            GuiElemCfg::default(),
                            move |button| {
                                let v = !search_is_case_sensitive
                                    .load(std::sync::atomic::Ordering::Relaxed);
                                search_is_case_sensitive
                                    .store(v, std::sync::atomic::Ordering::Relaxed);
                                ssc1.store(true, std::sync::atomic::Ordering::Relaxed);
                                *button
                                    .children()
                                    .next()
                                    .unwrap()
                                    .try_as_mut::<Label>()
                                    .unwrap()
                                    .content
                                    .text() = if v {
                                    FP_CASESENS_Y.to_owned()
                                } else {
                                    FP_CASESENS_N.to_owned()
                                };
                                vec![]
                            },
                            vec![GuiElem::new(Label::new(
                                GuiElemCfg::default(),
                                if is_case_sensitive {
                                    FP_CASESENS_Y.to_owned()
                                } else {
                                    FP_CASESENS_N.to_owned()
                                },
                                Color::GRAY,
                                None,
                                Vec2::new(0.5, 0.5),
                            ))],
                        )),
                        1.0,
                    ),
                    (
                        GuiElem::new(Button::new(
                            GuiElemCfg::default(),
                            move |button| {
                                let v = !search_prefer_start_matches
                                    .load(std::sync::atomic::Ordering::Relaxed);
                                search_prefer_start_matches
                                    .store(v, std::sync::atomic::Ordering::Relaxed);
                                ssc2.store(true, std::sync::atomic::Ordering::Relaxed);
                                *button
                                    .children()
                                    .next()
                                    .unwrap()
                                    .try_as_mut::<Label>()
                                    .unwrap()
                                    .content
                                    .text() = if v {
                                    FP_PREFSTART_Y.to_owned()
                                } else {
                                    FP_PREFSTART_N.to_owned()
                                };
                                vec![]
                            },
                            vec![GuiElem::new(Label::new(
                                GuiElemCfg::default(),
                                if prefer_start_matches {
                                    FP_PREFSTART_Y.to_owned()
                                } else {
                                    FP_PREFSTART_N.to_owned()
                                },
                                Color::GRAY,
                                None,
                                Vec2::new(0.5, 0.5),
                            ))],
                        )),
                        1.0,
                    ),
                ],
            ))],
            line_height: 0.0,
        }
    }
}
impl GuiElemTrait for FilterPanel {
    fn draw(&mut self, info: &mut DrawInfo, _g: &mut speedy2d::Graphics2D) {
        if info.line_height != self.line_height {
            for (_, h) in &mut self.children[0].try_as_mut::<ScrollBox>().unwrap().children {
                *h = info.line_height;
            }
            self.line_height = info.line_height;
        }
    }
    fn config(&self) -> &GuiElemCfg {
        &self.config
    }
    fn config_mut(&mut self) -> &mut GuiElemCfg {
        &mut self.config
    }
    fn children(&mut self) -> Box<dyn Iterator<Item = &mut GuiElem> + '_> {
        Box::new(self.children.iter_mut())
    }
    fn any(&self) -> &dyn std::any::Any {
        self
    }
    fn any_mut(&mut self) -> &mut dyn std::any::Any {
        self
    }
    fn clone_gui(&self) -> Box<dyn GuiElemTrait> {
        Box::new(self.clone())
    }
}