//
// Basic geometric things...
//
// Georg Hopp <georg@steffers.org>
//
// Copyright © 2019 Georg Hopp
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
//

use std::fmt::Debug;
use std::ops::{Add, Div, Mul, Neg, Sub};

use crate::math::transform::{TMatrix, Transformable};
use crate::math::trigonometry::Trig;
use crate::math::vector::Vector;

pub struct DirectLight<T>
where T: Add + Sub + Neg + Mul + Div + Debug + Copy + Trig + From<i32> {
    direction: Vector<T>,
}

impl<T> DirectLight<T>
where T: Add<Output = T> + Sub<Output = T> + Neg<Output = T>
       + Mul<Output = T> + Div<Output = T>
       + Debug + Copy + Trig + From<i32> {
    pub fn new(v :Vector<T>) -> Self {
        DirectLight{ direction: v }
    }

    pub fn transform(&self, m :&TMatrix<T>) -> Self {
        let DirectLight{ direction: v } = self;
        DirectLight { direction: v.transform(m) }
    }

    pub fn dir(&self) -> Vector<T> {
        self.direction
    }
}