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use le::Layout;

use crate::{
    le::layout::{Rect, Vec2},
    terminal::Buffer,
    Widget, WidgetType,
};

/// A widget which forces its child to be of a fixed size
pub struct FixedSize<'a> {
    /// The child widget
    pub widget: WidgetType<'a>,
    /// The width of the fixed-width.
    ///
    /// If not set it will either use [`Layout::prefered_size`] or use
    /// [`Layout::width_for_height`].
    pub width: Option<usize>,
    /// The height of the fixed-height.
    ///
    /// If not set it will either use [`Layout::prefered_size`] or use
    /// [`Layout::height_for_width`].
    pub height: Option<usize>,
}

impl<'a> FixedSize<'a> {
    /// Creates a new [`FixedSize`]
    pub fn new(
        widget: WidgetType<'a>,
        width: Option<usize>,
        height: Option<usize>,
    ) -> Box<Self> {
        Box::new(Self {
            widget,
            width,
            height,
        })
    }
}

impl Layout for FixedSize<'_> {
    fn width_for_height(&self, height: usize) -> usize {
        match self.width {
            Some(width) => width,
            None => self.widget.width_for_height(height),
        }
    }

    fn height_for_width(&self, width: usize) -> usize {
        match self.height {
            Some(height) => height,
            None => self.widget.height_for_width(width),
        }
    }

    fn prefered_size(&self) -> Vec2 {
        let widget_size = self.widget.prefered_size();
        Vec2::new(
            self.width.unwrap_or(widget_size.x),
            self.height.unwrap_or(widget_size.y),
        )
    }
}

impl Widget for FixedSize<'_> {
    fn render<'a>(&self, rect: Rect, buffer: &mut Buffer) {
        let mut rect = rect;
        match (self.width, self.height) {
            (Some(width), Some(height)) => {
                rect.size =
                    Vec2::new(width.min(rect.size.x), height.min(rect.size.y));
            }
            (Some(width), None) => {
                rect.size.x = width;
                rect.size.y = self.widget.height_for_width(width);
            }
            (None, Some(height)) => {
                rect.size.x = self.widget.width_for_height(height);
                rect.size.y = height;
            }
            (None, None) => (),
        }

        self.widget.render(rect, buffer);
    }
}