//! A meta tool for selecting parts of a map and removing them in a single operation.
//!
//! The user can draw a rectangle, which currently must have it's side parallel to the x and y-axes
//! of the world. With the first node placement, the mode is started, while the second placement would
//! finish the process and delete all elements that are *completely* contained in the rectangle
//! (partially contained items are not deleted) or abort it, in which case the selection is removed
//! and nothing is deleted.

use super::Tool;
use crate::colours::DEFAULT_COLOURS;
use crate::map::Map;
use crate::math::{ExactSurface, Rect, Vec2};
use crate::transform::Transform;
use raylib::core::drawing::{RaylibDraw, RaylibDrawHandle};

/// The deletion tool itself.
pub struct DeletionTool {
    deletion_rect: Option<(Vec2<f64>, Vec2<f64>)>,
}

impl DeletionTool {
    /// Create a new deletion tool, there should only be one deletion tool and it should be created
    /// by the editor.
    #[allow(clippy::new_without_default)]
    pub fn new() -> Self {
        Self {
            deletion_rect: None,
        }
    }
}

fn delete_rect((pos1, pos2): (&Vec2<f64>, &Vec2<f64>), map: &mut Map) {
    let bounds = Rect::bounding_rect(*pos1, *pos2);
    map.retain(|e| !bounds.contains_rect(&e.bounding_rect()));
}

impl Tool for DeletionTool {
    fn deactivate(&mut self) {
        self.deletion_rect = None;
    }

    fn update(&mut self, _map: &Map, mouse_pos_m: &Vec2<f64>) {
        if let Some((_, ref mut pos2)) = &mut self.deletion_rect {
            *pos2 = *mouse_pos_m;
        }
    }

    fn draw(&self, rld: &mut RaylibDrawHandle, transform: &Transform) {
        if let Some((pos1, pos2)) = self.deletion_rect {
            let rect_px = transform.rect_m_to_px(&Rect::bounding_rect(pos1, pos2));
            rld.draw_rectangle_rec(rect_px, DEFAULT_COLOURS.deletion_rect);
            rld.draw_rectangle_lines_ex(rect_px, 4, DEFAULT_COLOURS.deletion_rect_outline);
        }
    }

    fn place_single(&mut self, map: &mut Map, mouse_pos_m: &Vec2<f64>) {
        if let Some((pos1, pos2)) = self.deletion_rect {
            delete_rect((&pos1, &pos2), map);
            self.deletion_rect = None;
        } else {
            self.deletion_rect = Some((*mouse_pos_m, *mouse_pos_m));
        }
    }

    fn finish(&mut self, map: &mut Map) {
        if let Some((pos1, pos2)) = self.deletion_rect {
            delete_rect((&pos1, &pos2), map);
            self.deletion_rect = None;
        }
    }

    fn abort(&mut self) {
        self.deletion_rect = None;
    }
}