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use std::collections::hash_map::HashMap;

use crate::core::format::*;
use crate::core::variant::*;
use crate::core::resource::*;

#[derive(Debug)]
pub enum BlendFactor
{
	Zero,
	One,
	DstCol,
	SrcColor,
	SrcAlpha,
	DstAlpha,
	OneMinusSrcCol,
	OneMinusDstCol,
	OneMinusSrcAlpha,
	OneMinusDstAlpha,
	ConstantColor,
	ConstantAlpha,
	OneMinusConstantColor,
	OneMinusConstantAlpha,
	SrcAlphaSaturate,
}

#[derive(Debug)]
pub enum BlendOp
{
	Add,
	Subtract,
	RevSubtract
}

#[derive(Debug)]
pub enum ComparisonFunc
{
	Never,
	Less,
	Equal,
	Lequal,
	Greater,
	Notequal,
	Gequal,
	Always
}

#[derive(Debug)]
pub enum CullMode
{
	None,
	Front,
	Back,
	FrontBack,
}

#[derive(Debug)]
pub enum FrontFace
{
	CW,
	CCW,
}

#[derive(Debug)]
pub enum PolygonMode
{
	Point,
	Wireframe,
	Solid,
}

#[derive(Debug)]
pub struct VertexAttrib
{
	pub index:u8,
	pub count:u8,
	pub size:u8,
	pub stride:u8,
	pub offset:u16,
	pub format:Format,
}

impl VertexAttrib
{
	pub fn new(format:Format, index:u8, count:u8, size:u8, stride:u8, offset:u16) -> Self
	{
		Self
		{
			index:index,
			count:count,
			size:size,
			stride:stride,
			offset:offset,
			format:format,
		}
	}
}

pub trait Material : Resource
{
	fn input_layout(&self) -> &[VertexAttrib];
	fn uniforms(&self) -> &HashMap<String, Variant>;

	fn set_uniform(&mut self, name:&str, value:Variant);

	fn vs(&self) -> &str;
	fn fs(&self) -> &str;

	fn blend_enable(&self) -> bool { false }
	fn blend_op(&self) -> BlendOp { BlendOp::Add }
	fn blend_src(&self) -> BlendFactor { BlendFactor::SrcAlpha }
	fn blend_dest(&self) -> BlendFactor { BlendFactor::OneMinusConstantAlpha }
	fn blend_alpha_op(&self) -> BlendOp { BlendOp::Add }
	fn blend_alpha_src(&self) -> BlendFactor { BlendFactor::SrcAlpha }
	fn blend_alpha_dest(&self) -> BlendFactor { BlendFactor::OneMinusConstantAlpha }

	fn color_write_mask(&self) -> u32 { 0xFFFFFFFF }

	fn polygon_mode(&self) -> PolygonMode { PolygonMode::Solid }

	fn depth_enable(&self) -> bool { true }
	fn depth_write_enable(&self) -> bool { true }
	fn depth_func(&self) -> ComparisonFunc { ComparisonFunc::Lequal }

	fn cull_mode(&self) -> CullMode { CullMode::Back }

	fn line_width(&self) -> f32 { 1.0 }

	fn front_face(&self) -> FrontFace { FrontFace::CCW }
}