use crate::*;
use std::path::PathBuf;

#[derive(Default, Debug)]
pub struct App {
    /// Must not be dropped for the duration of the process
    pub jack: Jack,
    /// Port handles
    pub ports: std::collections::BTreeMap<u32, Port<Unowned>>,
    /// Display size
    pub size: Measure<TuiOut>,
    /// Performance counter
    pub perf: PerfModel,
    // View and input definition
    pub config: Configuration,
    /// Contains all recently created clips.
    pub pool: Pool,
    /// Contains the currently edited musical arrangement
    pub project: Arrangement,
    /// Undo history
    pub history: Vec<(AppCommand, Option<AppCommand>)>,
    // Dialog overlay
    pub dialog: Option<Dialog>,
    // Cache of formatted strings
    pub view_cache: Arc<RwLock<ViewCache>>,
    /// Base color.
    pub color: ItemTheme,
}

has!(Jack:               |self: App|self.jack);
has!(Pool:               |self: App|self.pool);
has!(Option<Dialog>:     |self: App|self.dialog);
has!(Clock:              |self: App|self.project.clock);
has!(Option<MidiEditor>: |self: App|self.project.editor);
has!(Selection:          |self: App|self.project.selection);
has!(Vec<JackMidiIn>:    |self: App|self.project.midi_ins);
has!(Vec<JackMidiOut>:   |self: App|self.project.midi_outs);
has!(Vec<Scene>:         |self: App|self.project.scenes);
has!(Vec<Track>:         |self: App|self.project.tracks);
has!(Measure<TuiOut>:    |self: App|self.size);
maybe_has!(Track:      |self: App|
    { MaybeHas::<Track>::get(&self.project) };
    { MaybeHas::<Track>::get_mut(&mut self.project) });
impl HasTrackScroll for App {
    fn track_scroll (&self) -> usize { self.project.track_scroll() }
}
maybe_has!(Scene:      |self: App|
    { MaybeHas::<Scene>::get(&self.project) };
    { MaybeHas::<Scene>::get_mut(&mut self.project) });
impl HasSceneScroll for App {
    fn scene_scroll (&self) -> usize { self.project.scene_scroll() }
}
has_clips!(|self: App|self.pool.clips);
impl HasClipsSize for App {
    fn clips_size (&self) -> &Measure<TuiOut> { &self.project.inner_size }
}
//has_editor!(|self: App|{
    //editor = self.editor;
    //editor_w = {
        //let size      = self.size.w();
        //let editor    = self.editor.as_ref().expect("missing editor");
        //let time_len  = editor.time_len().get();
        //let time_zoom = editor.time_zoom().get().max(1);
        //(5 + (time_len / time_zoom)).min(size.saturating_sub(20)).max(16)
    //};
    //editor_h = 15;
    //is_editing = self.editor.is_some();
//});

impl App {
    pub fn update_clock (&self) {
        ViewCache::update_clock(&self.view_cache, self.clock(), self.size.w() > 80)
    }
    pub fn toggle_dialog (&mut self, mut dialog: Option<Dialog>) -> Option<Dialog> {
        std::mem::swap(&mut self.dialog, &mut dialog);
        dialog
    }
    pub fn toggle_editor (&mut self, value: Option<bool>) {
        //FIXME: self.editing.store(value.unwrap_or_else(||!self.is_editing()), Relaxed);
        let value = value.unwrap_or_else(||!self.editor().is_some());
        if value {
            self.clip_auto_create();
        } else {
            self.clip_auto_remove();
        }
    }
    pub fn browser (&self) -> Option<&Browser> {
        self.dialog.as_ref().and_then(|dialog|match dialog {
            Dialog::Browser(_, b) => Some(b),
            _ => None
        })
    }
    pub(crate) fn device_pick (&mut self, index: usize) {
        self.dialog = Some(Dialog::Device(index));
    }
    pub(crate) fn device_add (&mut self, index: usize) -> Usually<()> {
        match index {
            0 => self.device_add_sampler(),
            1 => self.device_add_lv2(),
            _ => unreachable!(),
        }
    }
    fn device_add_lv2 (&mut self) -> Usually<()> {
        todo!();
        Ok(())
    }
    fn device_add_sampler (&mut self) -> Usually<()> {
        let name    = self.jack.with_client(|c|c.name().to_string());
        let midi    = self.project.track().expect("no active track").sequencer.midi_outs[0].name();
        let track   = self.track().expect("no active track");
        let port    = format!("{}/Sampler", &track.name);
        let connect = PortConnect::exact(format!("{name}:{midi}")); 
        let sampler = if let Ok(sampler) = Sampler::new(
            &self.jack, &port, &[connect], &[&[], &[]], &[&[], &[]]
        ) {
            self.dialog = None;
            Device::Sampler(sampler)
        } else {
            self.dialog = Some(Dialog::Message(Message::FailedToAddDevice));
            return Err("failed to add device".into())
        };
        let track   = self.track_mut().expect("no active track");
        track.devices.push(sampler);
        Ok(())
    }
    // Create new clip in pool when entering empty cell
    fn clip_auto_create (&mut self) -> Option<Arc<RwLock<MidiClip>>> {
        if let Selection::TrackClip { track, scene } = *self.selection()
        && let Some(scene) = self.project.scenes.get_mut(scene)
        && let Some(slot)  = scene.clips.get_mut(track)
        && slot.is_none()
        && let Some(track) = self.project.tracks.get_mut(track)
        {
            let (index, mut clip) = self.pool.add_new_clip();
            // autocolor: new clip colors from scene and track color
            let color = track.color.base.mix(scene.color.base, 0.5);
            clip.write().unwrap().color = ItemColor::random_near(color, 0.2).into();
            if let Some(ref mut editor) = &mut self.project.editor {
                editor.set_clip(Some(&clip));
            }
            *slot = Some(clip.clone());
            Some(clip)
        } else {
            None
        }
    }
    // Remove clip from arrangement when exiting empty clip editor
    fn clip_auto_remove (&mut self) {
        if let Selection::TrackClip { track, scene } = *self.selection()
        && let Some(scene) = self.project.scenes.get_mut(scene)
        && let Some(slot) = scene.clips.get_mut(track)
        && let Some(clip) = slot.as_mut()
        {
            let mut swapped = None;
            if clip.read().unwrap().count_midi_messages() == 0 {
                std::mem::swap(&mut swapped, slot);
            }
            if let Some(clip) = swapped {
                self.pool.delete_clip(&clip.read().unwrap());
            }
        }
    }
}

#[tengri_proc::expose]
impl App {
    fn _todo_isize_stub (&self) -> isize {
        todo!()
    }
    fn _todo_item_theme_stub (&self) -> ItemTheme {
        todo!()
    }
    fn w_sidebar (&self) -> u16 {
        self.project.w_sidebar(self.editor().is_some())
    }
    fn h_sample_detail (&self) -> u16 {
        6.max(self.height() as u16 * 3 / 9)
    }
    fn focus_editor (&self) -> bool {
        self.project.editor.is_some()
    }
    fn focus_dialog (&self) -> bool {
        self.dialog.is_some()
    }
    fn focus_message (&self) -> bool {
        matches!(self.dialog, Some(Dialog::Message(..)))
    }
    fn focus_device_add (&self) -> bool {
        matches!(self.dialog, Some(Dialog::Device(..)))
    }
    fn focus_browser (&self) -> bool {
        self.browser().is_some()
    }
    fn focus_clip (&self) -> bool {
        !self.focus_editor() && matches!(self.selection(),
            Selection::TrackClip{..})
    }
    fn focus_track (&self) -> bool {
        !self.focus_editor() && matches!(self.selection(),
            Selection::Track(..))
    }
    fn focus_scene (&self) -> bool {
        !self.focus_editor() && matches!(self.selection(),
            Selection::Scene(..))
    }
    fn focus_mix (&self) -> bool {
        !self.focus_editor() && matches!(self.selection(),
            Selection::Mix)
    }
    fn focus_pool_import (&self) -> bool {
        matches!(self.pool.mode, Some(PoolMode::Import(..)))
    }
    fn focus_pool_export (&self) -> bool {
        matches!(self.pool.mode, Some(PoolMode::Export(..)))
    }
    fn focus_pool_rename (&self) -> bool {
        matches!(self.pool.mode, Some(PoolMode::Rename(..)))
    }
    fn focus_pool_length (&self) -> bool {
        matches!(self.pool.mode, Some(PoolMode::Length(..)))
    }
    fn dialog_none (&self) -> Option<Dialog> {
        None
    }
    fn dialog_device (&self) -> Option<Dialog> {
        Some(Dialog::Device(0)) // TODO
    }
    fn dialog_device_prev (&self) -> Option<Dialog> {
        Some(Dialog::Device(0)) // TODO
    }
    fn dialog_device_next (&self) -> Option<Dialog> {
        Some(Dialog::Device(0)) // TODO
    }
    fn dialog_help (&self) -> Option<Dialog> {
        Some(Dialog::Help(0))
    }
    fn dialog_menu (&self) -> Option<Dialog> {
        Some(Dialog::Menu(0))
    }
    fn dialog_save (&self) -> Option<Dialog> {
        Some(Dialog::Browser(BrowserTarget::SaveProject, Browser::new(None).unwrap()))
    }
    fn dialog_load (&self) -> Option<Dialog> {
        Some(Dialog::Browser(BrowserTarget::LoadProject, Browser::new(None).unwrap()))
    }
    fn dialog_import_clip (&self) -> Option<Dialog> {
        Some(Dialog::Browser(BrowserTarget::ImportClip(Default::default()), Browser::new(None).unwrap()))
    }
    fn dialog_export_clip (&self) -> Option<Dialog> {
        Some(Dialog::Browser(BrowserTarget::ExportClip(Default::default()), Browser::new(None).unwrap()))
    }
    fn dialog_import_sample (&self) -> Option<Dialog> {
        Some(Dialog::Browser(BrowserTarget::ImportSample(Default::default()), Browser::new(None).unwrap()))
    }
    fn dialog_export_sample (&self) -> Option<Dialog> {
        Some(Dialog::Browser(BrowserTarget::ExportSample(Default::default()), Browser::new(None).unwrap()))
    }
    fn dialog_options (&self) -> Option<Dialog> {
        Some(Dialog::Options)
    }
    fn editor_pitch (&self) -> Option<u7> {
        Some((self.editor().as_ref().map(|e|e.get_note_pos()).unwrap() as u8).into())
    }
    fn scene_count (&self) -> usize {
        self.scenes().len()
    }
    fn scene_selected (&self) -> Option<usize> {
        self.selection().scene()
    }
    fn track_count (&self) -> usize {
        self.tracks().len()
    }
    fn track_selected (&self) -> Option<usize> {
        self.selection().track()
    }
    fn select_scene (&self) -> Selection {
        self.selection().select_scene(self.tracks().len())
    }
    fn select_scene_next (&self) -> Selection {
        self.selection().select_scene_next(self.scenes().len())
    }
    fn select_scene_prev (&self) -> Selection {
        self.selection().select_scene_prev()
    }
    fn select_track (&self) -> Selection {
        self.selection().select_track(self.tracks().len())
    }
    fn select_track_next (&self) -> Selection {
        self.selection().select_track_next(self.tracks().len())
    }
    fn select_track_prev (&self) -> Selection {
        self.selection().select_track_prev()
    }
    fn clip_selected (&self) -> Option<Arc<RwLock<MidiClip>>> {
        match self.selection() {
            Selection::TrackClip { track, scene } => self.scenes()[*scene].clips[*track].clone(),
            _ => None
        }
    }
    fn device_kind (&self) -> usize {
        if let Some(Dialog::Device(index)) = self.dialog {
            index
        } else {
            0
        }
    }
    fn device_kind_prev (&self) -> usize {
        if let Some(Dialog::Device(index)) = self.dialog {
            index.overflowing_sub(1).0.min(device_kinds().len().saturating_sub(1))
        } else {
            0
        }
    }
    fn device_kind_next (&self) -> usize {
        if let Some(Dialog::Device(index)) = self.dialog {
            (index + 1) % device_kinds().len()
        } else {
            0
        }
    }
}

/// Configuration
#[derive(Default, Debug)]
pub struct Configuration {
    /// Path of configuration entrypoint
    pub path: PathBuf,
    /// Name of configuration
    pub name: Option<Arc<str>>,
    /// Description of configuration
    pub info: Option<Arc<str>>,
    /// View definition
    pub view: TokenIter<'static>,
    // Input keymap
    pub keys: InputMap<'static, App, AppCommand, TuiIn, TokenIter<'static>>,
}

impl Configuration {

    pub fn new (path: &impl AsRef<Path>, _watch: bool) -> Usually<Self> {
        let text = read_and_leak(path.as_ref())?;
        let [name, info, view, keys] = Self::parse(TokenIter::from(text))?;
        Ok(Self {
            path: path.as_ref().into(),
            info: info.map(Self::parse_info).flatten(),
            name: name.map(Self::parse_name).flatten(),
            view: Self::parse_view(view)?,
            keys: Self::parse_keys(&path, keys)?,
        })
    }

    fn parse (iter: TokenIter) -> Usually<[Option<TokenIter>;4]> {
        let mut name: Option<TokenIter> = None;
        let mut info: Option<TokenIter> = None;
        let mut view: Option<TokenIter> = None;
        let mut keys: Option<TokenIter> = None;
        for token in iter {
            match token.value {
                Value::Exp(_, mut exp) => {
                    let next = exp.next();
                    match next {
                        Some(Token { value: Value::Key(sym), .. }) => match sym {
                            "name" => name = Some(exp),
                            "info" => info = Some(exp),
                            "keys" => keys = Some(exp),
                            "view" => view = Some(exp),
                            _ => return Err(
                                format!("(e3) unexpected symbol {sym:?}").into()
                            )
                        },
                        _ => return Err(
                            format!("(e2) unexpected exp {:?}", next.map(|x|x.value)).into()
                        )
                    }
                },
                t => return Err(
                    format!("(e1) unexpected token {token:?}").into()
                )
            };
        }
        Ok([name, info, view, keys])
    }

    fn parse_info (mut iter: TokenIter) -> Option<Arc<str>> {
        iter.next().and_then(|x|if let Value::Str(x) = x.value {
            Some(x.into())
        } else {
            None
        })
    }

    fn parse_name (mut iter: TokenIter) -> Option<Arc<str>> {
        iter.next().and_then(|x|if let Value::Str(x) = x.value {
            Some(x.into())
        } else {
            None
        })
    }

    fn parse_view (iter: Option<TokenIter>) -> Usually<TokenIter> {
        if let Some(view) = iter {
            Ok(view)
        } else {
            Err(format!("missing view definition").into())
        }
    }

    fn parse_keys (base: &impl AsRef<Path>, iter: Option<TokenIter<'static>>)
        -> Usually<InputMap<'static, App, AppCommand, TuiIn, TokenIter<'static>>>
    {
        if iter.is_none() {
            return Err(format!("missing keys definition").into())
        }
        let mut keys = iter.unwrap();
        let mut map  = InputMap::default();
        while let Some(token) = keys.next() {
            if let Value::Exp(_, mut exp) = token.value {
                let next = exp.next();
                if let Some(Token { value: Value::Key(sym), .. }) = next {
                    match sym {
                        "layer" => {
                            if let Some(Token { value: Value::Str(path), .. }) = exp.peek() {
                                let path = base.as_ref().parent().unwrap().join(unquote(path));
                                if !std::fs::exists(&path)? {
                                    return Err(format!("(e5) not found: {path:?}").into())
                                }
                                map.add_layer(read_and_leak(path)?.into());
                                print!("layer:\n  path: {:?}...", exp.0.0.trim());
                                println!("ok");
                            } else {
                                return Err(format!("(e4) unexpected non-string {next:?}").into())
                            }
                        },

                        "layer-if" => {
                            let mut cond = None;

                            let next = exp.next();
                            if let Some(Token { value: Value::Sym(sym), .. }) = next {
                                cond = Some(leak(sym));
                            } else {
                                return Err(format!("(e4) unexpected non-symbol {next:?}").into())
                            };

                            let token = exp.peek();
                            if let Some(Token { value: Value::Str(path), .. }) = token {
                                let path = base.as_ref().parent().unwrap().join(unquote(path));
                                if !std::fs::exists(&path)? {
                                    return Err(format!("(e5) not found: {path:?}").into())
                                }
                                print!("layer-if:\n  cond: {}\n  path: {path:?}...",
                                    cond.unwrap_or_default());
                                let keys = read_and_leak(path)?.into();
                                let cond = cond.unwrap();
                                println!("ok");
                                map.add_layer_if(
                                    Box::new(move |state: &App|{
                                        Context::get(state,
                                            &mut format!("{cond}").as_str().into())
                                                .unwrap_or_else(||panic!(
                                                    "missing input layer conditional {cond} from {exp:?}"))
                                    }),
                                    keys
                                );
                            } else {
                                return Err(format!("(e4) unexpected non-symbol {next:?}").into())
                            }
                        },

                        _ => return Err(format!("(e3) unexpected symbol {sym:?}").into())
                    }
                } else {
                    return Err(format!("(e2) unexpected exp {:?}", next.map(|x|x.value)).into())
                }
            } else {
                return Err(format!("(e1) unexpected token {token:?}").into())
            }
        }
        Ok(map)
    }

}

fn read_and_leak (path: impl AsRef<Path>) -> Usually<&'static str> {
    Ok(leak(String::from_utf8(std::fs::read(path.as_ref())?)?))
}

fn leak (x: impl AsRef<str>) -> &'static str {
    Box::leak(x.as_ref().into())
}

fn unquote (x: &str) -> &str {
    let mut chars = x.chars();
    chars.next();
    //chars.next_back();
    chars.as_str()
}

macro_rules! default_config { ($path:literal) => { ($path, include_str!($path)) }; }
pub const DEFAULT_CONFIGS: &'static [(&'static str, &'static str)] = &[
    default_config!("../../../config/config_arranger.edn"),
    default_config!("../../../config/config_groovebox.edn"),
    default_config!("../../../config/config_sampler.edn"),
    default_config!("../../../config/config_sequencer.edn"),
    default_config!("../../../config/config_transport.edn"),

    default_config!("../../../config/keys_arranger.edn"),
    default_config!("../../../config/keys_clip.edn"),
    default_config!("../../../config/keys_clock.edn"),
    default_config!("../../../config/keys_editor.edn"),
    default_config!("../../../config/keys_global.edn"),
    default_config!("../../../config/keys_groovebox.edn"),
    default_config!("../../../config/keys_length.edn"),
    default_config!("../../../config/keys_mix.edn"),
    default_config!("../../../config/keys_pool.edn"),
    default_config!("../../../config/keys_pool_file.edn"),
    default_config!("../../../config/keys_rename.edn"),
    default_config!("../../../config/keys_sampler.edn"),
    default_config!("../../../config/keys_scene.edn"),
    default_config!("../../../config/keys_sequencer.edn"),
    default_config!("../../../config/keys_track.edn"),
];