// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.

use std::num::NonZeroU32;

use deno_core::error::bad_resource_id;
use deno_core::error::null_opbuf;
use deno_core::error::AnyError;
use deno_core::OpState;
use deno_core::ResourceId;
use deno_core::ZeroCopyBuf;
use serde::Deserialize;

use super::error::WebGpuResult;

type WebGpuQueue = super::WebGpuDevice;

#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct QueueSubmitArgs {
  queue_rid: ResourceId,
  command_buffers: Vec<u32>,
}

pub fn op_webgpu_queue_submit(
  state: &mut OpState,
  args: QueueSubmitArgs,
  _zero_copy: Option<ZeroCopyBuf>,
) -> Result<WebGpuResult, AnyError> {
  let instance = state.borrow::<super::Instance>();
  let queue_resource = state
    .resource_table
    .get::<WebGpuQueue>(args.queue_rid)
    .ok_or_else(bad_resource_id)?;
  let queue = queue_resource.0;

  let mut ids = vec![];

  for rid in args.command_buffers {
    let buffer_resource = state
      .resource_table
      .get::<super::command_encoder::WebGpuCommandBuffer>(rid)
      .ok_or_else(bad_resource_id)?;
    ids.push(buffer_resource.0);
  }

  let maybe_err =
    gfx_select!(queue => instance.queue_submit(queue, &ids)).err();

  Ok(WebGpuResult::maybe_err(maybe_err))
}

#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
struct GpuImageDataLayout {
  offset: Option<u64>,
  bytes_per_row: Option<u32>,
  rows_per_image: Option<u32>,
}

#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct QueueWriteBufferArgs {
  queue_rid: ResourceId,
  buffer: u32,
  buffer_offset: u64,
  data_offset: usize,
  size: Option<usize>,
}

pub fn op_webgpu_write_buffer(
  state: &mut OpState,
  args: QueueWriteBufferArgs,
  zero_copy: Option<ZeroCopyBuf>,
) -> Result<WebGpuResult, AnyError> {
  let zero_copy = zero_copy.ok_or_else(null_opbuf)?;
  let instance = state.borrow::<super::Instance>();
  let buffer_resource = state
    .resource_table
    .get::<super::buffer::WebGpuBuffer>(args.buffer)
    .ok_or_else(bad_resource_id)?;
  let buffer = buffer_resource.0;
  let queue_resource = state
    .resource_table
    .get::<WebGpuQueue>(args.queue_rid)
    .ok_or_else(bad_resource_id)?;
  let queue = queue_resource.0;

  let data = match args.size {
    Some(size) => &zero_copy[args.data_offset..(args.data_offset + size)],
    None => &zero_copy[args.data_offset..],
  };
  let maybe_err = gfx_select!(queue => instance.queue_write_buffer(
    queue,
    buffer,
    args.buffer_offset,
    data
  ))
  .err();

  Ok(WebGpuResult::maybe_err(maybe_err))
}

#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct QueueWriteTextureArgs {
  queue_rid: ResourceId,
  destination: super::command_encoder::GpuImageCopyTexture,
  data_layout: GpuImageDataLayout,
  size: super::texture::GpuExtent3D,
}

pub fn op_webgpu_write_texture(
  state: &mut OpState,
  args: QueueWriteTextureArgs,
  zero_copy: Option<ZeroCopyBuf>,
) -> Result<WebGpuResult, AnyError> {
  let zero_copy = zero_copy.ok_or_else(null_opbuf)?;
  let instance = state.borrow::<super::Instance>();
  let texture_resource = state
    .resource_table
    .get::<super::texture::WebGpuTexture>(args.destination.texture)
    .ok_or_else(bad_resource_id)?;
  let queue_resource = state
    .resource_table
    .get::<WebGpuQueue>(args.queue_rid)
    .ok_or_else(bad_resource_id)?;
  let queue = queue_resource.0;

  let destination = wgpu_core::command::ImageCopyTexture {
    texture: texture_resource.0,
    mip_level: args.destination.mip_level.unwrap_or(0),
    origin: args
      .destination
      .origin
      .map_or(Default::default(), |origin| wgpu_types::Origin3d {
        x: origin.x.unwrap_or(0),
        y: origin.y.unwrap_or(0),
        z: origin.z.unwrap_or(0),
      }),
  };
  let data_layout = wgpu_types::ImageDataLayout {
    offset: args.data_layout.offset.unwrap_or(0),
    bytes_per_row: NonZeroU32::new(args.data_layout.bytes_per_row.unwrap_or(0)),
    rows_per_image: NonZeroU32::new(
      args.data_layout.rows_per_image.unwrap_or(0),
    ),
  };

  gfx_ok!(queue => instance.queue_write_texture(
    queue,
    &destination,
    &*zero_copy,
    &data_layout,
    &wgpu_types::Extent3d {
      width: args.size.width.unwrap_or(1),
      height: args.size.height.unwrap_or(1),
      depth_or_array_layers: args.size.depth_or_array_layers.unwrap_or(1),
    }
  ))
}