use crate::*;

/// Define a type alias for iterators of sized items (columns).
macro_rules! def_sizes_iter {
    ($Type:ident => $($Item:ty),+) => {
        pub(crate) trait $Type<'a> =
            Iterator<Item=(usize, $(&'a $Item,)+ usize, usize)> + Send + Sync + 'a;}}

def_sizes_iter!(ScenesSizes  => Scene);
def_sizes_iter!(TracksSizes  => Track);
def_sizes_iter!(InputsSizes  => JackMidiIn);
def_sizes_iter!(OutputsSizes => JackMidiOut);
def_sizes_iter!(PortsSizes   => Arc<str>, [PortConnect]);

impl Tek {
    /// Spacing between tracks.
    pub(crate) const TRACK_SPACING: usize = 0;
    /// Default scene height.
    pub(crate) const H_SCENE: usize = 2;
    /// Default editor height.
    pub(crate) const H_EDITOR: usize = 15;

    /// Width of display
    pub(crate) fn w (&self) -> u16 {
        self.size.w() as u16
    }
    pub(crate) fn w_sidebar (&self) -> u16 {
        self.w() / if self.is_editing() { 16 } else { 8 } as u16
    }
    /// Width taken by all tracks.
    pub(crate) fn w_tracks (&self) -> u16 {
        self.tracks_sizes().last().map(|(_, _, _, x)|x as u16).unwrap_or(0)
    }
    /// Width available to display tracks.
    pub(crate) fn w_tracks_area (&self) -> u16 {
        self.w().saturating_sub(2 * self.w_sidebar())
    }
    /// Height of display
    pub(crate) fn h (&self) -> u16 {
        self.size.h() as u16
    }
    /// Height available to display tracks.
    pub(crate) fn h_tracks_area (&self) -> u16 {
        self.h().saturating_sub(self.h_inputs() + self.h_outputs() + 10)
    }
    /// Height taken by all inputs.
    pub(crate) fn h_inputs (&self) -> u16 {
        1 + self.inputs_sizes().last().map(|(_, _, _, _, y)|y as u16).unwrap_or(0)
    }
    /// Height taken by all outputs.
    pub(crate) fn h_outputs (&self) -> u16 {
        1 + self.outputs_sizes().last().map(|(_, _, _, _, y)|y as u16).unwrap_or(0)
    }
    /// Height taken by all scenes.
    pub(crate) fn h_scenes (&self) -> u16 {
        self.scenes_sizes(self.is_editing(), Self::H_SCENE, Self::H_EDITOR).last()
            .map(|(_, _, _, y)|y as u16).unwrap_or(0)
    }
}
#[cfg(test)] mod test {
    use super::*;
    #[test] fn test_view_size () {
        let app = Tek::default();
        let _ = app.w();
        let _ = app.w_sidebar();
        let _ = app.w_tracks_area();
        let _ = app.h();
        let _ = app.h_tracks_area();
        let _ = app.h_inputs();
        let _ = app.h_outputs();
        let _ = app.h_scenes();
    }
}