use crate::*;

#[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>,
    // 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!(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);
//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 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_kinds (&self) -> &'static [&'static str] {
        &[
            "Sampler",
            "Plugin (LV2)",
        ]
    }
    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());
            }
        }
    }
}

/// Various possible dialog overlays
#[derive(Clone, Debug)]
pub enum Dialog {
    Help(usize),
    Menu(usize),
    Device(usize),
    Message(Message),
    Browser(BrowserTarget, Browser),
    Options,
}

#[derive(Clone, Debug)]
pub enum BrowserTarget {
    SaveProject,
    LoadProject,
    ImportSample(Arc<RwLock<Option<Sample>>>),
    ExportSample(Arc<RwLock<Option<Sample>>>),
    ImportClip(Arc<RwLock<Option<MidiClip>>>),
    ExportClip(Arc<RwLock<Option<MidiClip>>>),
}

/// Various possible messages
#[derive(PartialEq, Clone, Copy, Debug)]
pub enum Message {
    FailedToAddDevice,
}

content!(TuiOut: |self: Message| match self { Self::FailedToAddDevice => "Failed to add device." });

#[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 is_editing (&self) -> bool {
        self.project.editor.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.is_editing() && self.selection().is_clip()
    }
    fn focus_track (&self) -> bool {
        !self.is_editing() && self.selection().is_track()
    }
    fn focus_scene (&self) -> bool {
        !self.is_editing() && self.selection().is_scene()
    }
    fn focus_mix (&self) -> bool {
        !self.is_editing() && self.selection().is_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_selection (&self) -> Option<usize> {
        self.selection().scene()
    }
    fn track_count (&self) -> usize {
        self.tracks().len()
    }
    fn track_selection (&self) -> Option<usize> {
        self.selection().track()
    }
    fn select_scene_next (&self) -> Selection {
        self.selection().scene_next(self.scenes().len())
    }
    fn select_scene_prev (&self) -> Selection {
        self.selection().scene_prev()
    }
    fn select_track_header (&self) -> Selection {
        self.selection().track_header(self.tracks().len())
    }
    fn select_track_next (&self) -> Selection {
        self.selection().track_next(self.tracks().len())
    }
    fn select_track_prev (&self) -> Selection {
        self.selection().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(self.device_kinds().len().saturating_sub(1))
        } else {
            0
        }
    }
    fn device_kind_next (&self) -> usize {
        if let Some(Dialog::Device(index)) = self.dialog {
            (index + 1) % self.device_kinds().len()
        } else {
            0
        }
    }
}