use crate::*;

pub fn tek_arc_str <'a> (_: &App, src: impl Language) -> Perhaps<Arc<str>> {
    Ok(src.src()?.map(|x|x.into()))
}

pub fn tek_u16 <'a> (state: &App, src: impl Language) -> Perhaps<u16> {
    Ok(Some(match src.word()? {
        Some(":w/sidebar") => state.project.w_sidebar(state.editor().is_some()),
        Some(":h/sample-detail") => 6.max(state.size.h() as u16 * 3 / 9),
        _ => return try_to_u16(src)
    }))
}

pub fn tek_usize <'a> (state: &App, src: impl Language) -> Perhaps<usize> {
    Ok(Some(match src.word()? {
        Some(":scene-count")      => state.scenes().len(),
        Some(":track-count")      => state.tracks().len(),
        Some(":device-kind")      => state.dialog.device_kind().unwrap_or(0),
        Some(":device-kind/next") => state.dialog.device_kind_next().unwrap_or(0),
        Some(":device-kind/prev") => state.dialog.device_kind_prev().unwrap_or(0),
        _ => return try_to_usize(src)
    }))
}

pub fn tek_f64 <'a> (_state: &App, _src: impl Language) -> Perhaps<f64> {
    todo!()
}

pub fn tek_bool <'a> (state: &App, src: impl Language) -> Perhaps<bool> {
    src.word()?.map(|word|Ok(match word {
        "Y"                    => true,
        "N"                    => false,
        ":mode/editor"         => state.project.editor.is_some(),
        ":focused/dialog"      => !matches!(state.dialog, Dialog::None),
        ":focused/message"     => matches!(state.dialog, Dialog::Message(..)),
        ":focused/add_device"  => matches!(state.dialog, Dialog::Device(..)),
        ":focused/browser"     => state.dialog.browser().is_some(),
        //":focused/pool/import" => matches!(state.project.pool.mode, Some(PoolMode::Import(..))),
        //":focused/pool/export" => matches!(state.project.pool.mode, Some(PoolMode::Export(..))),
        //":focused/pool/rename" => matches!(state.project.pool.mode, Some(PoolMode::Rename(..))),
        //":focused/pool/length" => matches!(state.project.pool.mode, Some(PoolMode::Length(..))),
        ":focused/clip"        => matches!(state.selection(), Selection::TrackClip{..}),
        ":focused/track"       => matches!(state.selection(), Selection::Track(..)),
        ":focused/scene"       => matches!(state.selection(), Selection::Scene(..)),
        ":focused/mix"         => matches!(state.selection(), Selection::Mix),
        _ => return err!("not bool: {word}")
    })).transpose()
}

#[allow(unused)]
pub fn tek_selection <'a> (state: &App, src: impl Language) -> Perhaps<Selection> {
    src.word()?.map(|word|Ok(match word {
        ":select/scene"      => state.selection().select_scene(state.tracks().len()),
        ":select/scene/next" => state.selection().select_scene_next(state.scenes().len()),
        ":select/scene/prev" => state.selection().select_scene_prev(),
        ":select/track"      => state.selection().select_track(state.tracks().len()),
        ":select/track/next" => state.selection().select_track_next(state.tracks().len()),
        ":select/track/prev" => state.selection().select_track_prev(),
        _ => return err!("not selection: {word}")
    })).transpose()
}

pub fn tek_color <'a> (_: &App, src: impl Language) -> Perhaps<Color> {
    if let Some(expr) = src.expr()? {
        match (expr.head()?, expr.tail()?) {
            (Some("g"),   Some(tail)) => {
                let n = try_to_u8(tail.head().map_err(Into::into))?
                    .ok_or(LanguageError::domain("not gray"))?;
                Ok(Some(Color::Rgb(n, n, n)))
            },
            (Some("rgb"), Some(tail)) => {
                let r = try_to_u8(tail.head().map_err(Into::into))?
                    .ok_or(LanguageError::domain("not red"))?;
                let g = try_to_u8(tail.tail().head().map_err(Into::into))?
                    .ok_or(LanguageError::domain("not green"))?;
                let b = try_to_u8(tail.tail().tail().head().map_err(Into::into))?
                    .ok_or(LanguageError::domain("not blue"))?;
                Ok(Some(Color::Rgb(r, g, b)))
            },
            (Some(_),     _) => return err!("not a color expression: {expr}"),
            (None,        _) => return err!("not a color expression: {expr}"),
        }
    } else if let Ok(Some(sym)) = src.word() {
        Ok(match sym {
            ":color/bg" => Some(Color::Rgb(28, 32, 36)),
            ":color/fg" => Some(Color::Rgb(98, 92, 96)),
            _ => return err!("not a color: {sym}")
        })
    } else {
        return err!("not a color: {:?}", src.src()?)
    }
}

#[allow(unused)]
pub fn tek_opt_u7 <'a> (state: &App, src: impl Language) -> Perhaps<Option<u7>> {
    eval_word(src, |word|Ok(match word {

        ":editor/pitch" => Some((
            state.editor().as_ref().map(|e|e.get_note_pos()).unwrap() as u8
        ).into()),

        _ => return err!("unknown midi note: {word}")

    }))
}

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

        ":selected/scene" => state.selection().scene(),
        ":selected/track" => state.selection().track(),

        _ => return err!("unknown opt<usize>: {word}")

    }))
}


pub fn tek_opt_u16 <'a> (_: &App, _src: impl Language) -> Perhaps<Option<u16>> {
    Ok(None)
}

pub fn tek_opt_u32 <'a> (_: &App, _src: impl Language) -> Perhaps<Option<u32>> {
    Ok(None)
}

pub fn tek_opt_itemtheme <'a> (_: &App, _: impl Language) -> Perhaps<Option<ItemTheme>> {
    todo!()
}

pub fn tek_opt_arc_array_connect <'a> (_: &App, _: impl Language) -> Perhaps<Option<Arc<[Connect]>>> {
    todo!()
}

pub fn tek_arc_array_connect <'a> (_: &App, _: impl Language) -> Perhaps<Arc<[Connect]>> {
    todo!()
}

pub fn tek_opt_arc_str <'a> (_: &App, _: impl Language) -> Perhaps<Option<Arc<str>>> {
    todo!()
}

pub fn tek_opt_bool <'a> (_: &App, _: impl Language) -> Perhaps<Option<bool>> {
    todo!()
}

pub fn tek_path_buf <'a> (_: &App, _: impl Language) -> Perhaps<PathBuf> {
    todo!()
}

pub fn tek_vec_arc_str <'a> (_: &App, _: impl Language) -> Perhaps<Vec<Arc<str>>> {
    todo!()
}