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

use deno_core::error::type_error;
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::cell::RefCell;

use super::error::WebGpuResult;

pub(crate) struct WebGpuRenderPass(pub(crate) RefCell<wgpu_core::command::RenderPass>);
impl Resource for WebGpuRenderPass {
    fn name(&self) -> Cow<str> {
        "webGPURenderPass".into()
    }
}

#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct RenderPassSetViewportArgs {
    render_pass_rid: ResourceId,
    x: f32,
    y: f32,
    width: f32,
    height: f32,
    min_depth: f32,
    max_depth: f32,
}

#[op2]
#[serde]
pub fn op_webgpu_render_pass_set_viewport(
    state: &mut OpState,
    #[serde] args: RenderPassSetViewportArgs,
) -> Result<WebGpuResult, AnyError> {
    let render_pass_resource = state
        .resource_table
        .get::<WebGpuRenderPass>(args.render_pass_rid)?;

    wgpu_core::command::render_ffi::wgpu_render_pass_set_viewport(
        &mut render_pass_resource.0.borrow_mut(),
        args.x,
        args.y,
        args.width,
        args.height,
        args.min_depth,
        args.max_depth,
    );

    Ok(WebGpuResult::empty())
}

#[op2]
#[serde]
pub fn op_webgpu_render_pass_set_scissor_rect(
    state: &mut OpState,
    #[smi] render_pass_rid: ResourceId,
    x: u32,
    y: u32,
    width: u32,
    height: u32,
) -> Result<WebGpuResult, AnyError> {
    let render_pass_resource = state
        .resource_table
        .get::<WebGpuRenderPass>(render_pass_rid)?;

    wgpu_core::command::render_ffi::wgpu_render_pass_set_scissor_rect(
        &mut render_pass_resource.0.borrow_mut(),
        x,
        y,
        width,
        height,
    );

    Ok(WebGpuResult::empty())
}

#[op2]
#[serde]
pub fn op_webgpu_render_pass_set_blend_constant(
    state: &mut OpState,
    #[smi] render_pass_rid: ResourceId,
    #[serde] color: wgpu_types::Color,
) -> Result<WebGpuResult, AnyError> {
    let render_pass_resource = state
        .resource_table
        .get::<WebGpuRenderPass>(render_pass_rid)?;

    wgpu_core::command::render_ffi::wgpu_render_pass_set_blend_constant(
        &mut render_pass_resource.0.borrow_mut(),
        &color,
    );

    Ok(WebGpuResult::empty())
}

#[op2]
#[serde]
pub fn op_webgpu_render_pass_set_stencil_reference(
    state: &mut OpState,
    #[smi] render_pass_rid: ResourceId,
    reference: u32,
) -> Result<WebGpuResult, AnyError> {
    let render_pass_resource = state
        .resource_table
        .get::<WebGpuRenderPass>(render_pass_rid)?;

    wgpu_core::command::render_ffi::wgpu_render_pass_set_stencil_reference(
        &mut render_pass_resource.0.borrow_mut(),
        reference,
    );

    Ok(WebGpuResult::empty())
}

#[op2]
#[serde]
pub fn op_webgpu_render_pass_begin_occlusion_query(
    state: &mut OpState,
    #[smi] render_pass_rid: ResourceId,
    query_index: u32,
) -> Result<WebGpuResult, AnyError> {
    let render_pass_resource = state
        .resource_table
        .get::<WebGpuRenderPass>(render_pass_rid)?;

    wgpu_core::command::render_ffi::wgpu_render_pass_begin_occlusion_query(
        &mut render_pass_resource.0.borrow_mut(),
        query_index,
    );

    Ok(WebGpuResult::empty())
}

#[op2]
#[serde]
pub fn op_webgpu_render_pass_end_occlusion_query(
    state: &mut OpState,
    #[smi] render_pass_rid: ResourceId,
) -> Result<WebGpuResult, AnyError> {
    let render_pass_resource = state
        .resource_table
        .get::<WebGpuRenderPass>(render_pass_rid)?;

    wgpu_core::command::render_ffi::wgpu_render_pass_end_occlusion_query(
        &mut render_pass_resource.0.borrow_mut(),
    );

    Ok(WebGpuResult::empty())
}

#[op2]
#[serde]
pub fn op_webgpu_render_pass_execute_bundles(
    state: &mut OpState,
    #[smi] render_pass_rid: ResourceId,
    #[serde] bundles: Vec<u32>,
) -> Result<WebGpuResult, AnyError> {
    let bundles = bundles
        .iter()
        .map(|rid| {
            let render_bundle_resource = state
                .resource_table
                .get::<super::bundle::WebGpuRenderBundle>(*rid)?;
            Ok(render_bundle_resource.1)
        })
        .collect::<Result<Vec<_>, AnyError>>()?;

    let render_pass_resource = state
        .resource_table
        .get::<WebGpuRenderPass>(render_pass_rid)?;

    // SAFETY: the raw pointer and length are of the same slice, and that slice
    // lives longer than the below function invocation.
    unsafe {
        wgpu_core::command::render_ffi::wgpu_render_pass_execute_bundles(
            &mut render_pass_resource.0.borrow_mut(),
            bundles.as_ptr(),
            bundles.len(),
        );
    }

    Ok(WebGpuResult::empty())
}

#[op2]
#[serde]
pub fn op_webgpu_render_pass_end(
    state: &mut OpState,
    #[smi] command_encoder_rid: ResourceId,
    #[smi] render_pass_rid: ResourceId,
) -> Result<WebGpuResult, AnyError> {
    let command_encoder_resource =
        state
            .resource_table
            .get::<super::command_encoder::WebGpuCommandEncoder>(command_encoder_rid)?;
    let command_encoder = command_encoder_resource.1;
    let render_pass_resource = state
        .resource_table
        .take::<WebGpuRenderPass>(render_pass_rid)?;
    let render_pass = &render_pass_resource.0.borrow();
    let instance = state.borrow::<super::Instance>();

    gfx_ok!(command_encoder => instance.command_encoder_run_render_pass(command_encoder, render_pass))
}

#[op2]
#[serde]
pub fn op_webgpu_render_pass_set_bind_group(
    state: &mut OpState,
    #[smi] render_pass_rid: ResourceId,
    index: u32,
    bind_group: u32,
    #[buffer] dynamic_offsets_data: &[u32],
    #[number] dynamic_offsets_data_start: usize,
    #[number] dynamic_offsets_data_length: usize,
) -> Result<WebGpuResult, AnyError> {
    let bind_group_resource = state
        .resource_table
        .get::<super::binding::WebGpuBindGroup>(bind_group)?;
    let render_pass_resource = state
        .resource_table
        .get::<WebGpuRenderPass>(render_pass_rid)?;

    let start = dynamic_offsets_data_start;
    let len = dynamic_offsets_data_length;

    // Assert that length and start are both in bounds
    assert!(start <= dynamic_offsets_data.len());
    assert!(len <= dynamic_offsets_data.len() - start);

    let dynamic_offsets_data: &[u32] = &dynamic_offsets_data[start..start + len];

    // SAFETY: the raw pointer and length are of the same slice, and that slice
    // lives longer than the below function invocation.
    unsafe {
        wgpu_core::command::render_ffi::wgpu_render_pass_set_bind_group(
            &mut render_pass_resource.0.borrow_mut(),
            index,
            bind_group_resource.1,
            dynamic_offsets_data.as_ptr(),
            dynamic_offsets_data.len(),
        );
    }

    Ok(WebGpuResult::empty())
}

#[op2]
#[serde]
pub fn op_webgpu_render_pass_push_debug_group(
    state: &mut OpState,
    #[smi] render_pass_rid: ResourceId,
    #[string] group_label: &str,
) -> Result<WebGpuResult, AnyError> {
    let render_pass_resource = state
        .resource_table
        .get::<WebGpuRenderPass>(render_pass_rid)?;

    let label = std::ffi::CString::new(group_label).unwrap();
    // SAFETY: the string the raw pointer points to lives longer than the below
    // function invocation.
    unsafe {
        wgpu_core::command::render_ffi::wgpu_render_pass_push_debug_group(
            &mut render_pass_resource.0.borrow_mut(),
            label.as_ptr(),
            0, // wgpu#975
        );
    }

    Ok(WebGpuResult::empty())
}

#[op2]
#[serde]
pub fn op_webgpu_render_pass_pop_debug_group(
    state: &mut OpState,
    #[smi] render_pass_rid: ResourceId,
) -> Result<WebGpuResult, AnyError> {
    let render_pass_resource = state
        .resource_table
        .get::<WebGpuRenderPass>(render_pass_rid)?;

    wgpu_core::command::render_ffi::wgpu_render_pass_pop_debug_group(
        &mut render_pass_resource.0.borrow_mut(),
    );

    Ok(WebGpuResult::empty())
}

#[op2]
#[serde]
pub fn op_webgpu_render_pass_insert_debug_marker(
    state: &mut OpState,
    #[smi] render_pass_rid: ResourceId,
    #[string] marker_label: &str,
) -> Result<WebGpuResult, AnyError> {
    let render_pass_resource = state
        .resource_table
        .get::<WebGpuRenderPass>(render_pass_rid)?;

    let label = std::ffi::CString::new(marker_label).unwrap();
    // SAFETY: the string the raw pointer points to lives longer than the below
    // function invocation.
    unsafe {
        wgpu_core::command::render_ffi::wgpu_render_pass_insert_debug_marker(
            &mut render_pass_resource.0.borrow_mut(),
            label.as_ptr(),
            0, // wgpu#975
        );
    }

    Ok(WebGpuResult::empty())
}

#[op2]
#[serde]
pub fn op_webgpu_render_pass_set_pipeline(
    state: &mut OpState,
    #[smi] render_pass_rid: ResourceId,
    pipeline: u32,
) -> Result<WebGpuResult, AnyError> {
    let render_pipeline_resource = state
        .resource_table
        .get::<super::pipeline::WebGpuRenderPipeline>(pipeline)?;
    let render_pass_resource = state
        .resource_table
        .get::<WebGpuRenderPass>(render_pass_rid)?;

    wgpu_core::command::render_ffi::wgpu_render_pass_set_pipeline(
        &mut render_pass_resource.0.borrow_mut(),
        render_pipeline_resource.1,
    );

    Ok(WebGpuResult::empty())
}

#[op2]
#[serde]
pub fn op_webgpu_render_pass_set_index_buffer(
    state: &mut OpState,
    #[smi] render_pass_rid: ResourceId,
    buffer: u32,
    #[serde] index_format: wgpu_types::IndexFormat,
    #[number] offset: u64,
    #[number] size: Option<u64>,
) -> Result<WebGpuResult, AnyError> {
    let buffer_resource = state
        .resource_table
        .get::<super::buffer::WebGpuBuffer>(buffer)?;
    let render_pass_resource = state
        .resource_table
        .get::<WebGpuRenderPass>(render_pass_rid)?;

    let size = if let Some(size) = size {
        Some(
            std::num::NonZeroU64::new(size)
                .ok_or_else(|| type_error("size must be larger than 0"))?,
        )
    } else {
        None
    };

    render_pass_resource.0.borrow_mut().set_index_buffer(
        buffer_resource.1,
        index_format,
        offset,
        size,
    );

    Ok(WebGpuResult::empty())
}

#[op2]
#[serde]
pub fn op_webgpu_render_pass_set_vertex_buffer(
    state: &mut OpState,
    #[smi] render_pass_rid: ResourceId,
    slot: u32,
    buffer: u32,
    #[number] offset: u64,
    #[number] size: Option<u64>,
) -> Result<WebGpuResult, AnyError> {
    let buffer_resource = state
        .resource_table
        .get::<super::buffer::WebGpuBuffer>(buffer)?;
    let render_pass_resource = state
        .resource_table
        .get::<WebGpuRenderPass>(render_pass_rid)?;

    let size = if let Some(size) = size {
        Some(
            std::num::NonZeroU64::new(size)
                .ok_or_else(|| type_error("size must be larger than 0"))?,
        )
    } else {
        None
    };

    wgpu_core::command::render_ffi::wgpu_render_pass_set_vertex_buffer(
        &mut render_pass_resource.0.borrow_mut(),
        slot,
        buffer_resource.1,
        offset,
        size,
    );

    Ok(WebGpuResult::empty())
}

#[op2]
#[serde]
pub fn op_webgpu_render_pass_draw(
    state: &mut OpState,
    #[smi] render_pass_rid: ResourceId,
    vertex_count: u32,
    instance_count: u32,
    first_vertex: u32,
    first_instance: u32,
) -> Result<WebGpuResult, AnyError> {
    let render_pass_resource = state
        .resource_table
        .get::<WebGpuRenderPass>(render_pass_rid)?;

    wgpu_core::command::render_ffi::wgpu_render_pass_draw(
        &mut render_pass_resource.0.borrow_mut(),
        vertex_count,
        instance_count,
        first_vertex,
        first_instance,
    );

    Ok(WebGpuResult::empty())
}

#[op2]
#[serde]
pub fn op_webgpu_render_pass_draw_indexed(
    state: &mut OpState,
    #[smi] render_pass_rid: ResourceId,
    index_count: u32,
    instance_count: u32,
    first_index: u32,
    base_vertex: i32,
    first_instance: u32,
) -> Result<WebGpuResult, AnyError> {
    let render_pass_resource = state
        .resource_table
        .get::<WebGpuRenderPass>(render_pass_rid)?;

    wgpu_core::command::render_ffi::wgpu_render_pass_draw_indexed(
        &mut render_pass_resource.0.borrow_mut(),
        index_count,
        instance_count,
        first_index,
        base_vertex,
        first_instance,
    );

    Ok(WebGpuResult::empty())
}

#[op2]
#[serde]
pub fn op_webgpu_render_pass_draw_indirect(
    state: &mut OpState,
    #[smi] render_pass_rid: ResourceId,
    indirect_buffer: u32,
    #[number] indirect_offset: u64,
) -> Result<WebGpuResult, AnyError> {
    let buffer_resource = state
        .resource_table
        .get::<super::buffer::WebGpuBuffer>(indirect_buffer)?;
    let render_pass_resource = state
        .resource_table
        .get::<WebGpuRenderPass>(render_pass_rid)?;

    wgpu_core::command::render_ffi::wgpu_render_pass_draw_indirect(
        &mut render_pass_resource.0.borrow_mut(),
        buffer_resource.1,
        indirect_offset,
    );

    Ok(WebGpuResult::empty())
}

#[op2]
#[serde]
pub fn op_webgpu_render_pass_draw_indexed_indirect(
    state: &mut OpState,
    #[smi] render_pass_rid: ResourceId,
    indirect_buffer: u32,
    #[number] indirect_offset: u64,
) -> Result<WebGpuResult, AnyError> {
    let buffer_resource = state
        .resource_table
        .get::<super::buffer::WebGpuBuffer>(indirect_buffer)?;
    let render_pass_resource = state
        .resource_table
        .get::<WebGpuRenderPass>(render_pass_rid)?;

    wgpu_core::command::render_ffi::wgpu_render_pass_draw_indexed_indirect(
        &mut render_pass_resource.0.borrow_mut(),
        buffer_resource.1,
        indirect_offset,
    );

    Ok(WebGpuResult::empty())
}
