use bitflags::bitflags;
use gl::types::GLint;

use crate::data_types::dimens::Dimens;
use crate::vector::Vec2;

pub mod buffer;
pub mod glsl;
pub mod shader;
pub mod texture;
pub mod vertex_array;

mod util;

pub mod debug;

pub fn set_viewport(position: Vec2<u32>, size: Dimens<u32>)
{
    unsafe {
        #[allow(clippy::cast_possible_wrap)]
        gl::Viewport(
            position.x as i32,
            position.y as i32,
            size.width as i32,
            size.height as i32,
        );
    }
}

pub fn clear_buffers(mask: BufferClearMask)
{
    unsafe {
        gl::Clear(mask.bits());
    }
}

pub fn set_polygon_mode(face: impl Into<PolygonModeFace>, mode: impl Into<PolygonMode>)
{
    unsafe {
        gl::PolygonMode(face.into() as u32, mode.into() as u32);
    }
}

pub fn enable(capacity: Capability)
{
    unsafe {
        gl::Enable(capacity as u32);
    }
}

pub fn get_context_flags() -> ContextFlags
{
    let mut context_flags: GLint = 0;

    unsafe {
        gl::GetIntegerv(gl::CONTEXT_FLAGS as u32, &mut context_flags);
    }

    ContextFlags::from_bits_truncate(context_flags as u32)
}

bitflags! {
    #[derive(Debug, Clone, Copy)]
    pub struct BufferClearMask: u32 {
        const COLOR = gl::COLOR_BUFFER_BIT;
        const DEPTH = gl::DEPTH_BUFFER_BIT;
        const STENCIL = gl::STENCIL_BUFFER_BIT;
    }
}

#[derive(Debug)]
#[repr(u32)]
pub enum Capability
{
    DepthTest = gl::DEPTH_TEST,
    MultiSample = gl::MULTISAMPLE,
}

#[derive(Debug)]
#[repr(u32)]
pub enum PolygonMode
{
    Point = gl::POINT,
    Line = gl::LINE,
    Fill = gl::FILL,
}

impl From<crate::draw_flags::PolygonMode> for PolygonMode
{
    fn from(mode: crate::draw_flags::PolygonMode) -> Self
    {
        match mode {
            crate::draw_flags::PolygonMode::Point => Self::Point,
            crate::draw_flags::PolygonMode::Fill => Self::Fill,
            crate::draw_flags::PolygonMode::Line => Self::Line,
        }
    }
}

#[derive(Debug)]
#[repr(u32)]
pub enum PolygonModeFace
{
    Front = gl::FRONT,
    Back = gl::BACK,
    FrontAndBack = gl::FRONT_AND_BACK,
}

impl From<crate::draw_flags::PolygonModeFace> for PolygonModeFace
{
    fn from(face: crate::draw_flags::PolygonModeFace) -> Self
    {
        match face {
            crate::draw_flags::PolygonModeFace::Front => Self::Front,
            crate::draw_flags::PolygonModeFace::Back => Self::Back,
            crate::draw_flags::PolygonModeFace::FrontAndBack => Self::FrontAndBack,
        }
    }
}

bitflags! {
#[derive(Debug, Clone, Copy)]
pub struct ContextFlags: u32 {
    const FORWARD_COMPATIBLE = gl::CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
    const DEBUG = gl::CONTEXT_FLAG_DEBUG_BIT;
    const ROBUST_ACCESS = gl::CONTEXT_FLAG_ROBUST_ACCESS_BIT;
}
}