use crate::builder;
use crate::color::{Color, Rgb};
use crate::data_types::vector::Vec3;
use crate::ecs::Component;
use crate::reflection::Reflection;

builder! {
#[builder(name = PointLightBuilder, derives = (Debug, Clone))]
#[derive(Debug, Clone, Component, Reflection)]
#[non_exhaustive]
pub struct PointLight
{
    /// Position in local space.
    pub local_position: Vec3<f32>,
    pub diffuse: Color<f32>,
    pub specular: Color<f32>,
    pub attenuation_params: AttenuationParams,
}
}

impl PointLight
{
    #[must_use]
    pub fn builder() -> PointLightBuilder
    {
        PointLightBuilder::default()
    }
}

impl Default for PointLight
{
    fn default() -> Self
    {
        Self {
            local_position: Vec3::default(),
            diffuse: Color::Rgb(Rgb { r: 0.5, g: 0.5, b: 0.5 }),
            specular: Color::Rgb(Rgb::<f32>::white()),
            attenuation_params: AttenuationParams::default(),
        }
    }
}

impl Default for PointLightBuilder
{
    fn default() -> Self
    {
        PointLight::default().into()
    }
}

/// Parameters for light [attenuation](https://en.wikipedia.org/wiki/Attenuation).
#[derive(Debug, Clone, Reflection)]
pub struct AttenuationParams
{
    pub constant: f32,
    pub linear: f32,
    pub quadratic: f32,
}

impl Default for AttenuationParams
{
    fn default() -> Self
    {
        Self {
            constant: 1.0,
            linear: 0.0,
            quadratic: 0.0,
        }
    }
}

builder! {
#[builder(name = DirectionalLightBuilder, derives = (Debug, Default, Clone))]
#[derive(Debug, Default, Clone, Component, Reflection)]
#[non_exhaustive]
pub struct DirectionalLight
{
    pub diffuse: Color<f32>,
    pub specular: Color<f32>,
    pub direction: Vec3<f32>,
}
}

impl DirectionalLight
{
    #[must_use]
    pub fn builder() -> DirectionalLightBuilder
    {
        DirectionalLightBuilder::default()
    }
}

builder! {
#[builder(name = EnvironmentalBuilder, derives = (Debug, Clone))]
#[derive(Debug, Clone, Component, Reflection)]
#[non_exhaustive]
pub struct Environmental
{
    pub ambient_color: Color<f32>,
}
}

impl Environmental
{
    pub fn builder() -> EnvironmentalBuilder
    {
        EnvironmentalBuilder::default()
    }
}

impl Default for Environmental
{
    fn default() -> Self
    {
        Self::builder().build()
    }
}

impl Default for EnvironmentalBuilder
{
    fn default() -> Self
    {
        Self {
            ambient_color: Color::Rgb(Rgb { r: 0.2, g: 0.2, b: 0.2 })
        }
    }
}