use crate::{*, browse::*, device::*, menu::*};

/// Various possible dialog modes.
///
/// ```
/// let dialog: tek::Dialog = Default::default();
/// ```
#[derive(Debug, Clone, Default, PartialEq)] pub enum Dialog {
    #[default] None,
    Help(usize),
    Menu(usize, MenuItems),
    Device(usize),
    Message(Arc<str>),
    Browse(BrowseTarget, Arc<Browse>),
    Options,
}
namespace!(App: Dialog { symbol = |app| {
    ":dialog/none"          => Dialog::None,
    ":dialog/options"       => Dialog::Options,
    ":dialog/device"        => Dialog::Device(0),
    ":dialog/device/prev"   => Dialog::Device(0),
    ":dialog/device/next"   => Dialog::Device(0),
    ":dialog/help"          => Dialog::Help(0),
    ":dialog/save"          => Dialog::Browse(BrowseTarget::SaveProject,
        Browse::new(None).unwrap().into()),
    ":dialog/load"          => Dialog::Browse(BrowseTarget::LoadProject,
        Browse::new(None).unwrap().into()),
    ":dialog/import/clip"   => Dialog::Browse(BrowseTarget::ImportClip(Default::default()),
        Browse::new(None).unwrap().into()),
    ":dialog/export/clip"   => Dialog::Browse(BrowseTarget::ExportClip(Default::default()),
        Browse::new(None).unwrap().into()),
    ":dialog/import/sample" => Dialog::Browse(BrowseTarget::ImportSample(Default::default()),
        Browse::new(None).unwrap().into()),
    ":dialog/export/sample" => Dialog::Browse(BrowseTarget::ExportSample(Default::default()),
        Browse::new(None).unwrap().into()),
}; });
impl Dialog {
    /// ```
    /// let _ = tek::Dialog::welcome();
    /// ```
    pub fn welcome () -> Self {
        Self::Menu(1, MenuItems([
            MenuItem("Resume session".into(),     Arc::new(Box::new(|_|Ok(())))),
            MenuItem("Create new session".into(), Arc::new(Box::new(|app|Ok({
                app.dialog = Dialog::None;
                app.mode = app.config.modes.clone().read().unwrap().get(":arranger").cloned().unwrap();
            })))),
            MenuItem("Load old session".into(),   Arc::new(Box::new(|_|Ok(())))),
        ].into()))
    }
    /// FIXME: generalize
    /// ```
    /// let _ = tek::Dialog::welcome().menu_selected();
    /// ```
    pub fn menu_selected (&self) -> Option<usize> {
        if let Self::Menu(selected, _) = self { Some(*selected) } else { None }
    }
    /// FIXME: generalize
    /// ```
    /// let _ = tek::Dialog::welcome().menu_next();
    /// ```
    pub fn menu_next (&self) -> Self {
        match self {
            Self::Menu(index, items) => Self::Menu(wrap_inc(*index, items.0.len()), items.clone()),
            _ => Self::None
        }
    }
    /// FIXME: generalize
    /// ```
    /// let _ = tek::Dialog::welcome().menu_prev();
    /// ```
    pub fn menu_prev (&self) -> Self {
        match self {
            Self::Menu(index, items) => Self::Menu(wrap_dec(*index, items.0.len()), items.clone()),
            _ => Self::None
        }
    }
    /// FIXME: generalize
    /// ```
    /// let _ = tek::Dialog::welcome().device_kind();
    /// ```
    pub fn device_kind (&self) -> Option<usize> {
        if let Self::Device(index) = self { Some(*index) } else { None }
    }
    /// FIXME: generalize
    /// ```
    /// let _ = tek::Dialog::welcome().device_kind_next();
    /// ```
    pub fn device_kind_next (&self) -> Option<usize> {
        self.device_kind().map(|index|(index + 1) % device_kinds().len())
    }
    /// FIXME: generalize
    /// ```
    /// let _ = tek::Dialog::welcome().device_kind_prev();
    /// ```
    pub fn device_kind_prev (&self) -> Option<usize> {
        self.device_kind().map(|index|index.overflowing_sub(1).0.min(device_kinds().len().saturating_sub(1)))
    }
    /// FIXME: implement
    pub fn message (&self) -> Option<&str> { todo!() }
    /// FIXME: implement
    pub fn browser (&self) -> Option<&Arc<Browse>> { todo!() }
    /// FIXME: implement
    pub fn browser_target (&self) -> Option<&BrowseTarget> { todo!() }
}