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use wm::layout::*;

/// Monocle layout with offset.
///
/// Shows one window at a time, keeping offsets to the screen borders.
/// New clients are added as master, otherwise they would be invisible at first.
#[derive(Debug)]
pub struct Monocle {
    /// x offset of master window (symmetric)
    pub offset_x: u32,
    /// y offset of master window (symmetric)
    pub offset_y: u32,
}

impl Default for Monocle {
    fn default() -> Monocle {
        Monocle {
            offset_x: 20,
            offset_y: 20,
        }
    }
}

impl Layout for Monocle {
    fn arrange(&self, num_windows: usize, screen: &TilingArea) -> Vec<Option<Geometry>> {
        let mut res = Vec::with_capacity(num_windows);
        // master window is shown
        res.push(Some(Geometry {
                          x: self.offset_x + screen.offset_x,
                          y: self.offset_y + screen.offset_y,
                          width: screen.width - 2 * self.offset_x - 2,
                          height: screen.height - 2 * self.offset_y - 2,
                      }));
        // all other windows are hidden
        for _ in 1..num_windows {
            res.push(None);
        }
        res
    }

    fn right_window(&self, _: usize, _: usize) -> Option<usize> {
        None
    }

    fn left_window(&self, _: usize, _: usize) -> Option<usize> {
        None
    }

    fn top_window(&self, _: usize, _: usize) -> Option<usize> {
        None
    }

    fn bottom_window(&self, _: usize, _: usize) -> Option<usize> {
        None
    }

    fn new_window_as_master(&self) -> bool {
        true
    }

    fn edit_layout(&mut self, msg: LayoutMessage) -> bool {
        match msg {
            LayoutMessage::XOffAbs(x) => self.offset_x = x,
            LayoutMessage::XOffRel(x) => {
                self.offset_x = if x < 0 {
                    self.offset_x.saturating_sub(x.abs() as u32)
                } else {
                    self.offset_x.saturating_add(x.abs() as u32)
                }
            }
            LayoutMessage::YOffAbs(y) => self.offset_y = y,
            LayoutMessage::YOffRel(y) => {
                self.offset_y = if y < 0 {
                    self.offset_y.saturating_sub(y.abs() as u32)
                } else {
                    self.offset_y.saturating_add(y.abs() as u32)
                }
            }
            _ => return false,
        };
        true
    }
}