//! Selection of items on the map.
//!
//! When selecting items on the map, the editor goes into a different mode than when editing a
//! specific kind of item. Actions that are available for specific types of items become
//! unavailable, while other actions that make use of the properties to a wide range of items
//! become available instead.
//! For this reason, the selection tool can be thought of as a kind of meta tool over tools.

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

/// The selection tool makes it possible to select any item on the map when activated.
pub struct SelectionTool {
    selection_rect: Option<(Vec2<f64>, Vec2<f64>)>,
}

impl SelectionTool {
    /// Create a new selection tool. There should be only one such tool per program instance and it
    /// should be created in the editor.
    #[allow(clippy::new_without_default)]
    pub fn new() -> Self {
        Self {
            selection_rect: None,
        }
    }
}

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

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

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

    fn place_single(
        &mut self,
        map: &mut Map,
        _server: &Connection<Cargo>,
        mouse_pos_m: &Vec2<f64>,
    ) {
        if let Some((pos1, pos2)) = self.selection_rect {
            // Select all items on the map that are inside of the selection rectangle
            let bounds = Rect::bounding_rect(pos1, pos2);
            for (_id, element) in map.elements_mut() {
                // TODO: Make it possible to do this additively by custom keybinding.
                element.set_selected(bounds.contains_rect(&element.as_component().bounding_rect()));
            }
            self.selection_rect = None;
        } else {
            self.selection_rect = Some((*mouse_pos_m, *mouse_pos_m));
        }
    }

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