//! Tool to create walls. For information about walls, see also
//! [the wall module](crate::map::wall).

use super::Tool;
use crate::client::map::Map;
use crate::client::transform::Transform;
use crate::math::{LineSegment, Vec2};
use crate::net::{Cargo, Connection};
use crate::world::Wall;
use raylib::core::drawing::{RaylibDraw, RaylibDrawHandle};
use raylib::ffi::{Color, Vector2};

/// The wall tool to create solid barriers a player usually cannot cross.
pub struct WallTool {
    unfinished_wall: Option<LineSegment<f64>>,
}

impl WallTool {
    /// Create a new wall tool. There should only be one wall tool per program instance, which should
    /// be created inside of the editor.
    #[allow(clippy::new_without_default)]
    pub fn new() -> Self {
        Self {
            unfinished_wall: None,
        }
    }
}

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

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

    fn draw(&self, rld: &mut RaylibDrawHandle, transform: &Transform) {
        if let Some(ref wall) = self.unfinished_wall {
            let start: Vector2 = transform.point_m_to_px(&wall.start).into();
            let end: Vector2 = transform.point_m_to_px(&wall.end).into();
            rld.draw_line_ex(
                start,
                end,
                transform.length_m_to_px(0.1) as f32,
                Color {
                    r: 150,
                    g: 200,
                    b: 150,
                    a: 255,
                },
            );
        }
    }

    fn place_single(
        &mut self,
        _map: &mut Map,
        server: &Connection<Cargo>,
        mouse_pos_m: &Vec2<f64>,
    ) {
        if let Some(wall) = self.unfinished_wall.take() {
            // Continue with the next wall straight away.
            self.unfinished_wall = Some(LineSegment::new(wall.end, wall.end));
            server.send(Cargo::AddWall(Wall::new(wall)));
        } else {
            self.unfinished_wall = Some(LineSegment::new(*mouse_pos_m, *mouse_pos_m));
        }
    }

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