// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.

use super::wgpu_types;
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 WebGpuTexture {
    pub(crate) instance: crate::Instance,
    pub(crate) id: wgpu_core::id::TextureId,
}

impl Resource for WebGpuTexture {
    fn name(&self) -> Cow<str> {
        "webGPUTexture".into()
    }

    fn close(self: Rc<Self>) {
        let instance = &self.instance;
        instance.texture_drop(self.id);
    }
}

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

    fn close(self: Rc<Self>) {
        self.0.texture_view_drop(self.1).unwrap();
    }
}

#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct CreateTextureArgs {
    device_rid: ResourceId,
    label: String,
    size: wgpu_types::Extent3d,
    mip_level_count: u32,
    sample_count: u32,
    dimension: wgpu_types::TextureDimension,
    format: wgpu_types::TextureFormat,
    usage: u32,
    view_formats: Vec<wgpu_types::TextureFormat>,
}

#[op2]
#[serde]
pub fn op_webgpu_create_texture(
    state: &mut OpState,
    #[serde] args: CreateTextureArgs,
) -> Result<WebGpuResult, deno_core::error::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::TextureDescriptor {
        label: Some(Cow::Owned(args.label)),
        size: args.size,
        mip_level_count: args.mip_level_count,
        sample_count: args.sample_count,
        dimension: args.dimension,
        format: args.format,
        usage: wgpu_types::TextureUsages::from_bits_truncate(args.usage),
        view_formats: args.view_formats,
    };

    let (val, maybe_err) = instance.device_create_texture(device, &descriptor, None);

    let rid = state.resource_table.add(WebGpuTexture {
        instance: instance.clone(),
        id: val,
    });

    Ok(WebGpuResult::rid_err(rid, maybe_err))
}

#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct CreateTextureViewArgs {
    texture_rid: ResourceId,
    label: String,
    format: Option<wgpu_types::TextureFormat>,
    dimension: Option<wgpu_types::TextureViewDimension>,
    #[serde(flatten)]
    range: wgpu_types::ImageSubresourceRange,
}

#[op2]
#[serde]
pub fn op_webgpu_create_texture_view(
    state: &mut OpState,
    #[serde] args: CreateTextureViewArgs,
) -> Result<WebGpuResult, deno_core::error::AnyError> {
    let instance = state.borrow::<super::Instance>();
    let texture_resource = state
        .resource_table
        .get::<WebGpuTexture>(args.texture_rid)?;
    let texture = texture_resource.id;

    let descriptor = wgpu_core::resource::TextureViewDescriptor {
        label: Some(Cow::Owned(args.label)),
        format: args.format,
        dimension: args.dimension,
        range: args.range,
        usage: None, // FIXME: Obtain actual value from desc
    };

    gfx_put!(instance.texture_create_view(
        texture,
        &descriptor,
        None
    ) => state, WebGpuTextureView)
}
