// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.

use deno_core::error::AnyError;
use deno_core::op2;
use deno_core::OpState;
use deno_core::Resource;
use deno_core::ResourceId;
use serde::Deserialize;
use std::borrow::Cow;
use std::rc::Rc;

use super::error::WebGpuResult;

pub(crate) struct WebGpuSampler(
  pub(crate) crate::Instance,
  pub(crate) wgpu_core::id::SamplerId,
);
impl Resource for WebGpuSampler {
  fn name(&self) -> Cow<str> {
    "webGPUSampler".into()
  }

  fn close(self: Rc<Self>) {
    let instance = &self.0;
    gfx_select!(self.1 => instance.sampler_drop(self.1));
  }
}

#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct CreateSamplerArgs {
  device_rid: ResourceId,
  label: String,
  address_mode_u: wgpu_types::AddressMode,
  address_mode_v: wgpu_types::AddressMode,
  address_mode_w: wgpu_types::AddressMode,
  mag_filter: wgpu_types::FilterMode,
  min_filter: wgpu_types::FilterMode,
  mipmap_filter: wgpu_types::FilterMode, // TODO: GPUMipmapFilterMode
  lod_min_clamp: f32,
  lod_max_clamp: f32,
  compare: Option<wgpu_types::CompareFunction>,
  max_anisotropy: u16,
}

#[op2]
#[serde]
pub fn op_webgpu_create_sampler(
  state: &mut OpState,
  #[serde] args: CreateSamplerArgs,
) -> Result<WebGpuResult, AnyError> {
  let instance = state.borrow::<super::Instance>();
  let device_resource = state
    .resource_table
    .get::<super::WebGpuDevice>(args.device_rid)?;
  let device = device_resource.1;

  let descriptor = wgpu_core::resource::SamplerDescriptor {
    label: Some(Cow::Owned(args.label)),
    address_modes: [
      args.address_mode_u,
      args.address_mode_v,
      args.address_mode_w,
    ],
    mag_filter: args.mag_filter,
    min_filter: args.min_filter,
    mipmap_filter: args.mipmap_filter,
    lod_min_clamp: args.lod_min_clamp,
    lod_max_clamp: args.lod_max_clamp,
    compare: args.compare,
    anisotropy_clamp: args.max_anisotropy,
    border_color: None, // native-only
  };

  gfx_put!(device => instance.device_create_sampler(
    device,
    &descriptor,
    ()
  ) => state, WebGpuSampler)
}