use crate::*;

pub type Clips = Vec<Arc<RwLock<MidiClip>>>;

pub trait HasClips {
    /// Active clip slot (immutable). Use this to access or modify current clip.
    fn clip (&self) -> Option<Arc<RwLock<MidiClip>>>;
    /// Active clip slot (mutable). Use this to place or remove a clip at current position.
    fn clip_mut (&self) -> &mut Option<Arc<RwLock<MidiClip>>>;
    /// Clip list (immutable). Use this to access or modify more than one clip.
    fn clips <'a> (&'a self) -> RwLockReadGuard<'a, Clips>;
    /// Clip list (mutable). Use this to define or delete new clips.
    fn clips_mut <'a> (&'a self) -> RwLockWriteGuard<'a, Clips>;
}

/// A MIDI sequence.
///
/// ```
/// let clip = tek::MidiClip::default();
/// ```
#[derive(Debug, Clone, Default)] pub struct MidiClip {
    pub uuid:        uuid::Uuid,
    /// Name of clip
    pub name:        Arc<str>,
    /// Temporal resolution in pulses per quarter note
    pub ppq:         usize,
    /// Length of clip in pulses
    pub length:      usize,
    /// Notes in clip
    pub notes:       MidiData,
    /// Whether to loop the clip or play it once
    pub looped:      bool,
    /// Start of loop
    pub loop_start:  usize,
    /// Length of loop
    pub loop_length: usize,
    /// All notes are displayed with minimum length
    pub percussive:  bool,
    /// Identifying color of clip
    pub color:       ItemTheme,
}

impl MidiClip {
    pub fn new (
        name:   impl AsRef<str>,
        looped: bool,
        length: usize,
        notes:  Option<MidiData>,
        color:  Option<ItemTheme>,
    ) -> Self {
        Self {
            uuid:        uuid::Uuid::new_v4(),
            name:        name.as_ref().into(),
            ppq:         PPQ,
            length,
            notes:       notes.unwrap_or(vec![Vec::with_capacity(16);length]),
            looped,
            loop_start:  0,
            loop_length: length,
            percussive:  true,
            color:       color.unwrap_or_else(ItemTheme::random)
        }
    }
    pub fn count_midi_messages (&self) -> usize {
        let mut count = 0;
        for tick in self.notes.iter() {
            count += tick.len();
        }
        count
    }
    pub fn set_length (&mut self, length: usize) {
        self.length = length;
        self.notes  = vec![Vec::with_capacity(16);length];
    }
    pub fn duplicate (&self) -> Self {
        let mut clone = self.clone();
        clone.uuid = uuid::Uuid::new_v4();
        clone
    }
    /// Change the color of a clip, returning the previous color.
    /// If value not provided, randomize.
    pub fn set_color (&mut self, color: Option<ItemTheme>) -> ItemTheme {
        let mut color = color.unwrap_or_else(||ItemTheme::random());
        std::mem::swap(&mut color, &mut self.color);
        color
    }
    /// Set loop mode for a clip, returning the previous loop state.
    /// If value not provided, toggle.
    pub fn toggle_loop (&mut self, looping: Option<bool>) -> bool {
        match looping {
            Some(true)  => {
                self.looped = true;
                false
            },
            Some(false) => {
                self.looped = false;
                true
            },
            None => {
                self.looped = !self.looped;
                !self.looped
            }
        }
    }
    /// Add a [MidiMessage] at a given `pulse` position of this clip.
    pub fn record_event (&mut self, pulse: usize, message: MidiMessage) {
        if pulse >= self.length { panic!("extend clip first") }
        self.notes[pulse].push(message);
    }
    /// Check if a range `start..end` contains MIDI Note On `k`
    pub fn contains_note_on (&self, k: u7, start: usize, end: usize) -> bool {
        for events in self.notes[start.max(0)..end.min(self.notes.len())].iter() {
            for event in events.iter() {
                if let MidiMessage::NoteOn {key,..} = event { if *key == k { return true } }
            }
        }
        false
    }
    /// Create a panic clip.
    pub fn stop_all () -> Self {
        let color = Some(ItemColor::from_tui(Color::Rgb(32, 32, 32)).into());
        Self::new("Stop", false, 1, Some(vec![vec![MIDI_PANIC]]), color)
    }
}

const MIDI_PANIC: MidiMessage = MidiMessage::Controller {
    controller: u7::new(123), value: u7::new(0),
};

pub type MidiData = Vec<Vec<MidiMessage>>;
impl PartialEq for MidiClip { fn eq (&self, other: &Self) -> bool { self.uuid == other.uuid } }
impl Eq for MidiClip {}

impl HasMidiClip for Project {
    fn clip (&self) -> Option<Arc<RwLock<MidiClip>>> { None }
}
impl HasMidiClip for App {
    fn clip (&self) -> Option<Arc<RwLock<MidiClip>>> { self.project.clip() }
}

impl<T: HasMidiClip
    + Namespace<Option<bool>>
    + Namespace<Option<ItemTheme>>
> MidiClipController for T {}

#[tek_proc::commands(MidiClipCommand)]
pub trait MidiClipController: HasMidiClip
    + Namespace<Option<bool>>
    + Namespace<Option<ItemTheme>>
{

    /// Create a clip at the current position if it does not already exist.
    #[command(Upsert = "upsert")]
    fn clip_upsert (&mut self) -> Perhaps<MidiClipCommand> {
        let clip = self.clip();
        //let old = self.scenes[scene].clips[track].clone();
        //self.scenes[scene].clips[track] = clip;
        //old
        todo!()
    }

    #[command(SetColor = "color")]
    fn clip_set_color (&mut self, color: Option<ItemTheme>) -> Perhaps<MidiClipCommand> {
        Ok(self.clip().map(|clip|MidiClipCommand::SetColor {
            color: Some(clip.write().set_color(color))
        }))
    }

    /// Toggle looping for the active clip
    #[command(SetLoop = "loop")]
    fn clip_toggle_loop (&mut self, looping: Option<bool>) -> Perhaps<MidiClipCommand> {
        Ok(self.clip().map(|clip|MidiClipCommand::SetLoop {
            looping: Some(clip.write().toggle_loop(looping))
        }))
    }

}

impl HasClipsSize for App { fn clips_size (&self) -> &Sizer { &self.project.size_inner } }
impl HasClipsSize for Project { fn clips_size (&self) -> &Sizer { &self.size_inner } }
pub trait HasClipsSize {
    /// Size of clips area.
    fn clips_size (&self) -> &Sizer;
    /// Draw content annotated with value of [Self::clips_size].
    fn with_clips_size (&self, show: bool, content: impl Draw<Tui>) -> impl Draw<Tui> {
        let size = self.clips_size();
        above(
            when(show, fg(Green, east!(size.w() as usize, "x", size.h() as usize)).align_se()),
            size.of(content.align_c().full_wh())
        )
    }
}

impl<T: TracksView + ScenesView + Send + Sync> ClipsView for T {}

pub trait ClipsView: TracksView + ScenesView {

    /// Draw clips per scene
    fn view_scenes_clips (&self) -> impl Draw<Tui> {
        let select  = self.selection();
        let editor  = self.editor();
        let editing = self.is_editing();
        self.with_clips_size(true, iter_east(move||self.tracks_with_sizes()
            .map(move|(track_index, track, _, _)|iter_south(move||self.scenes_with_sizes()
                .map(move|(scene_index, scene, _, _)|{
                    let (name, theme): (Arc<str>, ItemTheme) = view_scene_name_theme(scene, track_index);
                    let f = theme.lightest.term;
                    let (b, o) = view_scene_bg(theme, select, track_index, scene_index);
                    let is_selected = view_scene_sel(select, track_index, scene_index, editing);
                    below(
                        Outer(true, Style::default().fg(o)).full_wh(),
                        below(
                            below(
                                fg_bg(o, b, "".full_wh()),
                                fg_bg(f, b, bold(true, name)).align_nw().full_wh(),
                            ),
                            when(is_selected, editor).full_wh()
                        ).full_wh()
                    ).exact_wh(
                        view_scene_w(track, select, track_index, editor.as_ref()),
                        view_scene_y(select, scene_index, editor.as_ref()),
                    )
                })
            )
                .exact_w(track.width as u16))
        )).align_c()
    }

}

pub fn get_opt_arc_rwlock_midiclip <'a> (state: &App, src: impl Language)
    -> Perhaps<Option<Arc<RwLock<MidiClip>>>>
{
    eval_word(src, |word|Ok(match word {

        ":selected" if let Selection::TrackClip {
            track, scene
        } = state.selection() => {
            state.scenes()[*scene].clips[*track].clone()
        },

        //":selected-or-create" if let Selection::TrackClip {
            //track, scene
        //} = state.selection() => Some(if let Some(Some(clip)) = state.scenes()[*scene].clips.get(*track) {
            //clip.clone()
        //} else {
            //let clip: Arc<RwLock<MidiClip>> = Arc::new(RwLock::new(Default::default()));
            //state.scenes()[*scene].clips[*track] = Some(clip.clone());
            //clip
        //}),

        _ => return err!("not a clip: {word}")

    }))
}

pub fn get_opt_vec_opt_arc_rwlock_midiclip <'a> (_: &App, _: impl Language)
    -> Perhaps<Option<Vec<Option<Arc<RwLock<MidiClip>>>>>>
{
    todo!()
}