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/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

use crate::{
    device::RenderPassContext,
    id::{DeviceId, PipelineLayoutId, ShaderModuleId},
    validation::StageError,
    LifeGuard, RawString, RefCount, Stored,
};
use std::borrow::Borrow;
use wgt::{
    BufferAddress, ColorStateDescriptor, DepthStencilStateDescriptor, IndexFormat, InputStepMode,
    PrimitiveTopology, RasterizationStateDescriptor, VertexAttributeDescriptor,
};

#[repr(C)]
#[derive(Debug)]
pub struct VertexBufferLayoutDescriptor {
    pub array_stride: BufferAddress,
    pub step_mode: InputStepMode,
    pub attributes: *const VertexAttributeDescriptor,
    pub attributes_length: usize,
}

#[repr(C)]
#[derive(Debug)]
pub struct VertexStateDescriptor {
    pub index_format: IndexFormat,
    pub vertex_buffers: *const VertexBufferLayoutDescriptor,
    pub vertex_buffers_length: usize,
}

#[repr(C)]
#[derive(Debug)]
pub enum ShaderModuleSource<'a> {
    SpirV(&'a [u32]),
    Wgsl(&'a str),
    Naga(naga::Module),
}

#[derive(Debug)]
pub struct ShaderModule<B: hal::Backend> {
    pub(crate) raw: B::ShaderModule,
    pub(crate) device_id: Stored<DeviceId>,
    pub(crate) module: Option<naga::Module>,
}

#[repr(C)]
#[derive(Debug)]
pub struct ProgrammableStageDescriptor {
    pub module: ShaderModuleId,
    pub entry_point: RawString,
}

#[repr(C)]
#[derive(Debug)]
pub struct ComputePipelineDescriptor {
    pub layout: PipelineLayoutId,
    pub compute_stage: ProgrammableStageDescriptor,
}

#[derive(Clone, Debug)]
pub enum ComputePipelineError {
    Stage(StageError),
}

#[derive(Debug)]
pub struct ComputePipeline<B: hal::Backend> {
    pub(crate) raw: B::ComputePipeline,
    pub(crate) layout_id: Stored<PipelineLayoutId>,
    pub(crate) device_id: Stored<DeviceId>,
    pub(crate) life_guard: LifeGuard,
}

impl<B: hal::Backend> Borrow<RefCount> for ComputePipeline<B> {
    fn borrow(&self) -> &RefCount {
        self.life_guard.ref_count.as_ref().unwrap()
    }
}

#[repr(C)]
#[derive(Debug)]
pub struct RenderPipelineDescriptor {
    pub layout: PipelineLayoutId,
    pub vertex_stage: ProgrammableStageDescriptor,
    pub fragment_stage: *const ProgrammableStageDescriptor,
    pub primitive_topology: PrimitiveTopology,
    pub rasterization_state: *const RasterizationStateDescriptor,
    pub color_states: *const ColorStateDescriptor,
    pub color_states_length: usize,
    pub depth_stencil_state: *const DepthStencilStateDescriptor,
    pub vertex_state: VertexStateDescriptor,
    pub sample_count: u32,
    pub sample_mask: u32,
    pub alpha_to_coverage_enabled: bool,
}

#[derive(Clone, Debug)]
pub enum RenderPipelineError {
    InvalidVertexAttributeOffset {
        location: wgt::ShaderLocation,
        offset: BufferAddress,
    },
    Stage {
        flag: wgt::ShaderStage,
        error: StageError,
    },
    IncompatibleOutputFormat {
        index: u8,
    },
    InvalidSampleCount(u32),
}

bitflags::bitflags! {
    #[repr(transparent)]
    pub struct PipelineFlags: u32 {
        const BLEND_COLOR = 1;
        const STENCIL_REFERENCE = 2;
        const DEPTH_STENCIL_READ_ONLY = 4;
    }
}

#[derive(Debug)]
pub struct RenderPipeline<B: hal::Backend> {
    pub(crate) raw: B::GraphicsPipeline,
    pub(crate) layout_id: Stored<PipelineLayoutId>,
    pub(crate) device_id: Stored<DeviceId>,
    pub(crate) pass_context: RenderPassContext,
    pub(crate) flags: PipelineFlags,
    pub(crate) index_format: IndexFormat,
    pub(crate) vertex_strides: Vec<(BufferAddress, InputStepMode)>,
    pub(crate) life_guard: LifeGuard,
}

impl<B: hal::Backend> Borrow<RefCount> for RenderPipeline<B> {
    fn borrow(&self) -> &RefCount {
        self.life_guard.ref_count.as_ref().unwrap()
    }
}