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use super::{Body, Item};
use cubecl_core::{ir::CubeDim, CompilerRepresentation};
use std::{collections::HashSet, fmt::Display, io::Write, process::Command};

#[derive(Debug, PartialEq, Eq, Clone)]
pub struct Binding {
    pub item: Item,
    pub size: Option<usize>,
}

#[derive(Debug, PartialEq, Eq, Clone)]
pub struct SharedMemory {
    pub index: u16,
    pub item: Item,
    pub size: u32,
}

#[derive(Debug, PartialEq, Eq, Clone)]
pub struct LocalArray {
    pub index: u16,
    pub item: Item,
    pub depth: u8,
    pub size: u32,
}

impl LocalArray {
    pub fn new(index: u16, item: Item, depth: u8, size: u32) -> Self {
        Self {
            index,
            item,
            depth,
            size,
        }
    }
}

impl SharedMemory {
    pub fn new(index: u16, item: Item, size: u32) -> Self {
        Self { index, item, size }
    }
}

#[derive(Debug, Clone)]
pub struct ComputeKernel {
    pub inputs: Vec<Binding>,
    pub outputs: Vec<Binding>,
    pub named: Vec<(String, Binding)>,
    pub cube_dim: CubeDim,
    pub body: Body,
    pub wmma_activated: bool,
    pub bf16: bool,
    pub f16: bool,
    pub items: HashSet<super::Item>,
}

impl CompilerRepresentation for ComputeKernel {
    fn shared_memory_size(&self) -> usize {
        let mut current = 0usize;

        for var in self.body.shared_memories.iter() {
            let factor = var.item.vectorization;
            let elem_size_bytes = var.item.elem().size();
            current += (var.size as usize) * factor * elem_size_bytes;
        }

        current
    }
}

impl Display for ComputeKernel {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        if self.wmma_activated {
            f.write_str("#include <mma.h>\n")?;
        }
        if self.bf16 {
            f.write_str("#include <cuda_bf16.h>\n")?;
        }

        if self.f16 {
            f.write_str("#include <cuda_fp16.h>\n")?;
        }

        if self.wmma_activated {
            f.write_str("using namespace nvcuda;\n")?;
        }

        f.write_str("typedef unsigned int uint;\n")?;

        for item in self.items.iter() {
            if item.is_vec_native() {
                continue;
            }

            let elem = item.elem;
            let size = item.vectorization;
            let alignment = elem.size() * size;
            if size > 1 {
                f.write_fmt(format_args!(
                    "
struct __align__({alignment}) {item} {{"
                ))?;

                for i in 0..size {
                    f.write_fmt(format_args!(
                        "
    {elem} i_{i};"
                    ))?;
                }

                f.write_str("\n};\n")?;
            }
        }

        f.write_fmt(format_args!(
            "

extern \"C\" __global__ void kernel(
",
        ))?;

        let num_bindings = self.inputs.len() + self.outputs.len() + self.named.len();
        let mut binding_index = 0;
        for (index, binding) in self.inputs.iter().enumerate() {
            binding_index += 1;
            f.write_fmt(format_args!("{} input_{}[]", binding.item, index))?;
            if binding_index < num_bindings {
                f.write_str(",")?;
            }
        }
        for (index, binding) in self.outputs.iter().enumerate() {
            binding_index += 1;
            f.write_fmt(format_args!("{} output_{}[]", binding.item, index))?;
            if binding_index < num_bindings {
                f.write_str(",")?;
            }
        }
        for (name, binding) in self.named.iter() {
            binding_index += 1;
            f.write_fmt(format_args!("{} {}[]", binding.item, name))?;

            if binding_index < num_bindings {
                f.write_str(",")?;
            }
        }

        f.write_str("\n) {\n")?;

        f.write_fmt(format_args!("{}", self.body))?;
        f.write_str("\n}")?;

        Ok(())
    }
}

/// Format C++ code, useful when debugging.
pub(crate) fn format_cpp_code(code: &str) -> Result<String, std::io::Error> {
    let mut child = Command::new("clang-format")
        .stdin(std::process::Stdio::piped())
        .stdout(std::process::Stdio::piped())
        .spawn()?;

    {
        let stdin = child.stdin.as_mut().expect("Failed to open stdin");
        stdin.write_all(code.as_bytes())?;
    }

    let output = child.wait_with_output()?;

    if output.status.success() {
        Ok(String::from_utf8_lossy(&output.stdout).into_owned())
    } else {
        Err(std::io::Error::new(
            std::io::ErrorKind::Other,
            "clang-format failed",
        ))
    }
}