//! Icons are map elements that have a specific size and cannot be stretched. They are usually used
//! as markers for specific places in the world.

use super::icon_renderer::IconRenderer;
use crate::colours::DEFAULT_COLOURS;
use crate::map::Mappable;
use crate::math::{Rect, Vec2};
use crate::transform::Transform;
use raylib::core::drawing::{RaylibDraw, RaylibDrawHandle};
use serde::{Deserialize, Serialize};
use std::ops::{Deref, DerefMut};
use std::rc::Rc;

/// The icon data necessary to create an Icon again.
#[derive(Clone, Serialize, Deserialize)]
pub struct IconData {
    /// The id of the icon is the icons position in the currently loaded icon_data vector.
    pub id: usize,
    /// The position of the icon on the map, given by the vector in meters.
    pub position: Vec2<f64>,
    /// Rotation of the icon texture in degrees.
    pub rotation: f64,
}

/// Describes an icon in the world and can be drawn.
#[derive(Clone)]
pub struct Icon {
    data: IconData,
    selected: bool,
    renderer: Rc<IconRenderer>,
}

impl Icon {
    /// Create a new icon. Requires the icon renderer that is used to render this icon, as well as all
    /// the information necessary to describe the icon itself.
    pub fn new(id: usize, position: Vec2<f64>, rotation: f64, renderer: Rc<IconRenderer>) -> Self {
        Self::from_data(
            IconData {
                id,
                position,
                rotation,
            },
            renderer,
        )
    }

    /// Like `new()`, but with the icon data bundled into the icon data type.
    pub fn from_data(data: IconData, renderer: Rc<IconRenderer>) -> Self {
        Self {
            data,
            selected: false,
            renderer,
        }
    }
}

impl Mappable for Icon {
    fn draw(&self, rld: &mut RaylibDrawHandle, transform: &Transform) {
        let (texture, info) = self.renderer.get(self.id);
        // Round the position to whole pixels to fix rotation problems.
        let mut position_px =
            transform.point_m_to_px(&(self.position - (info.anchor / info.pixels_per_m)));
        position_px.x = position_px.x.floor();
        position_px.y = position_px.y.floor();
        rld.draw_texture_ex(
            texture,
            position_px,
            self.rotation as f32,
            (transform.pixels_per_m() / info.pixels_per_m) as f32,
            if self.selected() {
                DEFAULT_COLOURS.icon_selected
            } else {
                DEFAULT_COLOURS.icon_normal
            },
        );
    }

    fn set_selected(&mut self, selected: bool) {
        self.selected = selected;
    }

    fn selected(&self) -> bool {
        self.selected
    }

    fn bounding_rect(&self) -> Rect<f64> {
        Rect::new(self.data.position.x, self.data.position.y, 0., 0.)
    }
}

impl Deref for Icon {
    type Target = IconData;

    fn deref(&self) -> &Self::Target {
        &self.data
    }
}
impl DerefMut for Icon {
    fn deref_mut(&mut self) -> &mut Self::Target {
        &mut self.data
    }
}