use std::fs::{self, File};
use std::io::Write;
use std::path::PathBuf;

use anyhow::Result;
use clap::Parser;
use e0::codegen::CodegenBackend;
use e0::codegen::llvm_ir::LlvmIrCodegen;
use e0::parser::ProgramParser;

#[derive(Debug, Parser)]
struct Opt {
  path: PathBuf,

  /// Path to output the bitcode to.
  #[clap(short = 'o', long = "out", name = "bitcode-out")]
  out_path: PathBuf,

  /// Path to output the AST to, if at all.
  #[clap(long = "emit-ast", name = "ast-out")]
  emit_ast: Option<PathBuf>,
}

fn main() -> Result<()> {
  let opts = Opt::parse();

  let contents = fs::read_to_string(&opts.path)?;

  let parser = ProgramParser::new();
  let ast = parser.parse(&contents).unwrap();

  let typed_ast = e0::ast::typed::convert(ast)?;

  if let Some(path) = opts.emit_ast {
    let mut file = File::create(&path)?;
    file.write(format!("{:#?}", typed_ast).as_bytes())?;
  }

  {
    let file = File::create(&opts.out_path)?;
    let mut codegen = LlvmIrCodegen::new(file);
    codegen.convert(typed_ast)?;
  }

  // let ctx = ast::cranelift::convert(
  //   opts.path.display().to_string(),
  //   typed_ast,
  // )?;

  // {
  //   let file = File::create(&opts.out_path)?;
  //   ctx.compile_and_emit();
  //   println!("Emitted.");
  // }

  Ok(())
}