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// Copyright 2020-Present (c) Raja Lehtihet & Wael El Oraiby
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors
// may be used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
use crate::scalar::*;
use crate::vector::*;
use crate::matrix::*;

#[derive(Debug, Clone, Copy)]
pub enum BasisPlane {
    YZ,
    ZX,
    XY,
}

impl BasisPlane {
    pub fn to_id(&self) -> usize {
        match self {
            BasisPlane::YZ => 0,
            BasisPlane::ZX => 1,
            BasisPlane::XY => 2,
        }
    }

    pub fn of_id(id: usize) -> Self {
        match id {
            0 => BasisPlane::YZ,
            1 => BasisPlane::ZX,
            2 => BasisPlane::XY,
            _ => panic!("invalid id")
        }
    }
}

#[derive(Debug, Clone, Copy)]
#[repr(C)]
pub struct Basis<T: Scalar> {
    x_axis      : Vector3<T>,
    y_axis      : Vector3<T>,
    z_axis      : Vector3<T>,
    center      : Vector3<T>,
}

impl<T: Scalar> Basis<T> {

    pub fn center(&self) -> &Vector3<T> {
        &self.center
    }

    pub fn center_mut(&mut self) -> &mut Vector3<T> {
        &mut self.center
    }

    pub fn to_mat4(&self) -> Matrix4<T> {
        Matrix4::new(
            self.x_axis.x, self.x_axis.y, self.x_axis.z, T::zero(),
            self.y_axis.x, self.y_axis.y, self.y_axis.z, T::zero(),
            self.z_axis.x, self.z_axis.y, self.z_axis.z, T::zero(),
            self.center.x, self.center.y, self.center.z, T::one())
    }

    pub fn of_mat4(mat: &Matrix4<T>) -> Self {
        let col0    = mat.col[0];
        let col1    = mat.col[1];
        let col2    = mat.col[2];
        let col3    = mat.col[3];
        Self {
            center  : col3.xyz(),
            x_axis  : col0.xyz(),
            y_axis  : col1.xyz(),
            z_axis  : col2.xyz(),
        }
    }

    pub fn default() -> Self {
        Self {
            center  : Vector3::new(T::zero(), T::zero(), T::zero()),
            x_axis  : Vector3::new(T::one() , T::zero(), T::zero()),
            y_axis  : Vector3::new(T::zero(), T::one() , T::zero()),
            z_axis  : Vector3::new(T::zero(), T::zero(), T::one() ),
        }
    }

    pub fn default_with_center(center: &Vector3<T>) -> Self {
        Self {
            center  : *center,
            x_axis  : Vector3::new(T::one() , T::zero(), T::zero()),
            y_axis  : Vector3::new(T::zero(), T::one() , T::zero()),
            z_axis  : Vector3::new(T::zero(), T::zero(), T::one() ),
        }
    }

    pub fn plane_axis(&self, plane: BasisPlane) -> (&Vector3<T>, &Vector3<T>) {
        match plane {
            BasisPlane::YZ => (&self.y_axis, &self.z_axis),
            BasisPlane::ZX => (&self.z_axis, &self.x_axis),
            BasisPlane::XY => (&self.x_axis, &self.y_axis),
        }
    }

    pub fn plane_axis_mut(&mut self, plane: BasisPlane) -> (&mut Vector3<T>, &mut Vector3<T>) {
        match plane {
            BasisPlane::YZ => (&mut self.y_axis, &mut self.z_axis),
            BasisPlane::ZX => (&mut self.z_axis, &mut self.x_axis),
            BasisPlane::XY => (&mut self.x_axis, &mut self.y_axis),
        }
    }

}