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use {
    super::{
        DescriptorBindingMap, DescriptorSetLayout, Device, DriverError, PipelineDescriptorInfo,
        Shader,
    },
    crate::{as_u32_slice, ptr::Shared},
    archery::SharedPointerKind,
    ash::vk,
    derive_builder::Builder,
    log::trace,
    std::{collections::BTreeMap, ffi::CString, ops::Deref, thread::panicking},
};

#[derive(Debug)]
pub struct ComputePipeline<P>
where
    P: SharedPointerKind,
{
    pub descriptor_bindings: DescriptorBindingMap,
    pub descriptor_info: PipelineDescriptorInfo<P>,
    pub device: Shared<Device<P>, P>,
    pub layout: vk::PipelineLayout,
    pipeline: vk::Pipeline,
}

impl<P> ComputePipeline<P>
where
    P: SharedPointerKind,
{
    pub fn create(
        device: &Shared<Device<P>, P>,
        info: impl Into<ComputePipelineInfo>,
    ) -> Result<Self, DriverError> {
        use std::slice::from_ref;

        trace!("create");

        let device = Shared::clone(device);
        let info: ComputePipelineInfo = info.into();
        let shader = info.clone().into_shader();
        let descriptor_bindings = shader.descriptor_bindings(&device)?;
        let descriptor_info =
            PipelineDescriptorInfo::create(&device, &descriptor_bindings, shader.stage)?;
        let descriptor_set_layouts = descriptor_info
            .layouts
            .iter()
            .map(|(_, descriptor_set_layout)| **descriptor_set_layout)
            .collect::<Box<[_]>>();

        unsafe {
            let shader_module_create_info = vk::ShaderModuleCreateInfo {
                code_size: info.spirv.len(),
                p_code: info.spirv.as_ptr() as *const u32,
                ..Default::default()
            };
            let shader_module = device
                .create_shader_module(&shader_module_create_info, None)
                .map_err(|_| DriverError::Unsupported)?;
            let entry_name = CString::new(info.entry_name.as_bytes()).unwrap();
            let stage_create_info = vk::PipelineShaderStageCreateInfo::builder()
                .module(shader_module)
                .stage(shader.stage)
                .name(&entry_name);
            let layout = device
                .create_pipeline_layout(
                    &vk::PipelineLayoutCreateInfo::builder()
                        .set_layouts(&descriptor_set_layouts)
                        .push_constant_ranges(shader.push_constant_ranges()?.as_slice()),
                    None,
                )
                .map_err(|_| DriverError::Unsupported)?;
            let pipeline_info = vk::ComputePipelineCreateInfo::builder()
                .stage(stage_create_info.build())
                .layout(layout);
            let pipeline = device
                .create_compute_pipelines(
                    vk::PipelineCache::null(),
                    from_ref(&pipeline_info.build()),
                    None,
                )
                .map_err(|_| DriverError::Unsupported)?[0];

            device.destroy_shader_module(shader_module, None);

            Ok(ComputePipeline {
                descriptor_bindings,
                descriptor_info,
                device,
                layout,
                pipeline,
            })
        }
    }
}

impl<P> Deref for ComputePipeline<P>
where
    P: SharedPointerKind,
{
    type Target = vk::Pipeline;

    fn deref(&self) -> &Self::Target {
        &self.pipeline
    }
}

impl<P> Drop for ComputePipeline<P>
where
    P: SharedPointerKind,
{
    fn drop(&mut self) {
        if panicking() {
            return;
        }

        unsafe {
            self.device.destroy_pipeline(self.pipeline, None);
            self.device.destroy_pipeline_layout(self.layout, None);
        }
    }
}

#[derive(Builder, Clone, Debug, PartialEq)]
#[builder(pattern = "owned")]
pub struct ComputePipelineInfo {
    #[builder(setter(strip_option), default = "String::from(\"main\")")]
    pub entry_name: String,
    pub spirv: Vec<u8>,
}

impl ComputePipelineInfo {
    #[allow(clippy::new_ret_no_self)]
    pub fn new(spirv: impl Into<Vec<u8>>) -> ComputePipelineInfoBuilder {
        ComputePipelineInfoBuilder::default().spirv(spirv.into())
    }

    pub fn into_shader(self) -> Shader {
        Shader::new(vk::ShaderStageFlags::COMPUTE, self.spirv)
            .entry_name(self.entry_name)
            .build()
            .unwrap()
    }
}

impl From<ComputePipelineInfoBuilder> for ComputePipelineInfo {
    fn from(info: ComputePipelineInfoBuilder) -> Self {
        info.build().unwrap()
    }
}