use crate::error;

pub trait Widget {
    fn set_size(&mut self, size: WidgetSize) -> Result<(), error::WitError>;
    fn size(&self) -> WidgetSize;
    fn add_child(&mut self, child: Box<dyn Widget>) -> Result<(), error::WitError>;
    fn children(&self) -> &[Box<dyn Widget>];
    fn set_pos(&mut self, pos: WidgetPos) -> Result<(), error::WitError>;
    fn pos(&self) -> WidgetPos;
    fn set_display_mode(&mut self, display: DisplayMode) -> Result<(), error::WitError>;
    fn display_mode(&self) -> DisplayMode;

    fn set_static(&mut self) -> Result<(), error::WitError> { self.set_display_mode(DisplayMode::Static) }
    fn is_static(&self) -> bool { matches!(self.display_mode(), DisplayMode::Static) }
    fn set_floating(&mut self) -> Result<(), error::WitError> { self.set_display_mode(DisplayMode::Floating) }
    fn is_floating(&self) -> bool { matches!(self.display_mode(), DisplayMode::Floating) }
    fn hide(&mut self) -> Result<(), error::WitError> { self.set_display_mode(DisplayMode::Hidden) }
    fn is_hidden(&self) -> bool { matches!(self.display_mode(), DisplayMode::Hidden) }
}

// should write some macros to make this nicer

#[derive(Clone, Copy)]
pub struct WidgetSize(WidgetSizeDimn, WidgetSizeDimn);

impl WidgetSize {
    #[inline(always)]
    pub fn x(&self) -> WidgetSizeDimn {
        self.0
    }
    #[inline(always)]
    pub fn y(&self) -> WidgetSizeDimn {
        self.1
    }
}

impl From<WidgetSize> for (u16, u16) {
    #[inline(always)]
    fn from(size: WidgetSize) -> Self {
        (size.0.into(), size.1.into())
    }
}

#[derive(Clone, Copy)]
pub enum WidgetSizeDimn {
    Static(u16),
    Fill,
    Fit,
}

impl From<WidgetSizeDimn> for u16 {
    #[inline(always)]
    fn from(dim: WidgetSizeDimn) -> Self {
        match dim {
            WidgetSizeDimn::Static(x) => x,
            WidgetSizeDimn::Fill => todo!(),
            WidgetSizeDimn::Fit => todo!(),
        }
    }
}

#[derive(Clone, Copy)]
pub struct WidgetPos(WidgetPosDimn, WidgetPosDimn);

impl WidgetPos {
    #[inline(always)]
    pub fn x(&self) -> WidgetPosDimn {
        self.0
    }
    #[inline(always)]
    pub fn y(&self) -> WidgetPosDimn {
        self.1
    }
}

impl Default for WidgetPos {
    fn default() -> WidgetPos { 
        WidgetPos(WidgetPosDimn::FloatStart, WidgetPosDimn::FloatStart)
    }
}

#[derive(Clone, Copy)]
pub enum WidgetPosDimn {
    Static(u16),
    FloatStart,
    FloatEnd,
}

impl Default for WidgetPosDimn {
    fn default() -> Self { Self::FloatStart }
}

#[derive(Clone, Copy)]
pub enum DisplayMode {
    Static,
    Floating,
    Hidden,
}