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use color::{Rgba,ToRgba};
use super::{Property, texture::TextureSampler, AlphaType};
use super::parameter::{Parameter, Changed};

pub struct BasicMaterial{
    color: Option<Rgba<f32>>,
    texture: Option<TextureSampler>,
    properties: Vec<Property>,
    alpha_type: AlphaType,
    changed: Changed,
}

pub struct Builder{
    color: Option<Rgba<f32>>,
    properties: Vec<Property>,
    alpha_type: AlphaType,
}

pub struct BuilderWithTexture{
    color: Option<Rgba<f32>>,
    properties: Vec<Property>,
    texture: TextureSampler,
    alpha_type: AlphaType,
}

impl Builder{
    pub fn new() -> Builder{
        Builder{
            color: None,
            properties: vec![],
            alpha_type: AlphaType::None,
        }
    }

    pub fn color<C: ToRgba>(mut self, color: &C) -> Builder{
        self.color = Some(color.to_rgba());
        self
    }

    pub fn texture<T: Into<TextureSampler>>(self, texture: T) -> BuilderWithTexture{
        BuilderWithTexture{
            color: self.color,
            properties: self.properties,
            texture: texture.into(),
            alpha_type: self.alpha_type,
        }
    }

    pub fn properties(mut self, properties: Vec<Property>) -> Builder{
        self.properties = properties;
        self
    }

    pub fn alpha_type(mut self, alpha_type: AlphaType) -> Builder{
        self.alpha_type = alpha_type;
        self
    }

    pub fn build(self) -> BasicMaterial{
        BasicMaterial{
            color: self.color,
            properties: self.properties,
            alpha_type: self.alpha_type,
            texture: None,
            changed: Changed::default(),
        }
    }
}

impl BuilderWithTexture{
    pub fn color<C: ToRgba>(mut self, color: &C) -> BuilderWithTexture{
        self.color = Some(color.to_rgba());
        self
    }

    pub fn texture<T: Into<TextureSampler>>(self, texture: T) -> BuilderWithTexture{
        BuilderWithTexture{
            color: self.color,
            properties: self.properties,
            alpha_type: self.alpha_type,
            texture: texture.into()
        }
    }

    pub fn alpha_type(mut self, alpha_type: AlphaType) -> BuilderWithTexture{
        self.alpha_type = alpha_type;
        self
    }

    pub fn properties(mut self, properties: Vec<Property>) -> BuilderWithTexture{
        self.properties = properties;
        self
    }

    pub fn build(self) -> BasicMaterial{
        BasicMaterial{
            color: self.color,
            properties: self.properties,
            texture: Some(self.texture.into()),
            alpha_type: self.alpha_type,
            changed: Changed::default(),
        }
    }
}

impl Default for BasicMaterial{
    fn default() -> BasicMaterial{
        Builder::new().build()
    }
}

impl BasicMaterial{
    pub fn color(&self) -> Option<&Rgba<f32>>{
        self.color.as_ref()
    }

    pub fn texture(&self) -> Option<&TextureSampler>{
        self.texture.as_ref()
    }

    pub fn properties(&self) -> &[Property]{
        &self.properties
    }

    pub fn alpha_type(&self) -> AlphaType{
        self.alpha_type
    }
}



impl super::Material for BasicMaterial{
    fn parameters(&mut self) -> Vec<Parameter>{
        let changed = &self.changed;
        self.color.iter_mut()
            .map(move |color| Parameter::new("base_color", color, changed))
            .chain(self.texture.iter_mut().map(move |texture| Parameter::new("texture", texture, changed)))
            .chain(Some(Parameter::new("alpha_type", &mut self.alpha_type, &self.changed)))
            .collect()
    }

    fn parameter(&mut self, name: &str) -> Option<Parameter>{
        match name {
            "base_color" => if let Some(base_color) = self.color.as_mut(){
                Some(Parameter::new("base_color", base_color, &self.changed))
            }else{
                None
            },
            "texture" => if let Some(texture) = self.texture.as_mut(){
                Some(Parameter::new("texture", texture, &self.changed))
            }else{
                None
            },
            "alpha_type" => Some(Parameter::new("alpha_type", &mut self.alpha_type, &self.changed)),
            _ => None,
        }
    }

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

    fn reset_changed(&mut self){
        self.changed.reset();
    }
}