use crate::color::Color;
use crate::vector::Vec3;

#[derive(Debug, Clone)]
pub struct LightSource
{
    position: Vec3<f32>,
    ambient: Color<f32>,
    diffuse: Color<f32>,
    specular: Color<f32>,
}

impl LightSource
{
    #[must_use]
    pub fn position(&self) -> &Vec3<f32>
    {
        &self.position
    }

    #[must_use]
    pub fn ambient(&self) -> &Color<f32>
    {
        &self.ambient
    }

    #[must_use]
    pub fn diffuse(&self) -> &Color<f32>
    {
        &self.diffuse
    }

    #[must_use]
    pub fn specular(&self) -> &Color<f32>
    {
        &self.specular
    }

    pub fn translate(&mut self, translation: Vec3<f32>)
    {
        self.position += translation;
    }
}

#[derive(Debug, Clone, Default)]
pub struct LightSourceBuilder
{
    position: Vec3<f32>,
    ambient: Color<f32>,
    diffuse: Color<f32>,
    specular: Color<f32>,
}

impl LightSourceBuilder
{
    #[must_use]
    pub fn new() -> Self
    {
        Self {
            position: Vec3::default(),
            ambient: Color { red: 0.2, green: 0.2, blue: 0.2 },
            diffuse: Color { red: 0.5, green: 0.5, blue: 0.5 },
            specular: Color { red: 1.0, green: 1.0, blue: 1.0 },
        }
    }

    #[must_use]
    pub fn position(mut self, position: Vec3<f32>) -> Self
    {
        self.position = position;

        self
    }

    #[must_use]
    pub fn ambient(mut self, ambient: Color<f32>) -> Self
    {
        self.ambient = ambient;

        self
    }

    #[must_use]
    pub fn diffuse(mut self, diffuse: Color<f32>) -> Self
    {
        self.diffuse = diffuse;

        self
    }

    #[must_use]
    pub fn specular(mut self, specular: Color<f32>) -> Self
    {
        self.specular = specular;

        self
    }

    #[must_use]
    pub fn build(&self) -> LightSource
    {
        LightSource {
            position: self.position.clone(),
            ambient: self.ambient.clone(),
            diffuse: self.diffuse.clone(),
            specular: self.specular.clone(),
        }
    }
}