use clap::CommandFactory;
use clap_mangen::Man;
use std::fs;
use std::path::PathBuf;

include!("src/cli.rs");

fn main() {
    // Vendored protoc for reproducible builds
    let protoc = protoc_bin_vendored::protoc_bin_path().expect("protoc");

    println!("cargo:rerun-if-changed=proto/processes.proto");
    println!("cargo:rerun-if-changed=src/cli.rs");

    // Compile protobuf definitions for processes
    let mut cfg = prost_build::Config::new();
    cfg.out_dir(std::env::var("OUT_DIR").unwrap());
    cfg.protoc_executable(protoc); // Use the vendored protoc directly
    // Use local path (ensures file is inside published crate tarball)
    cfg.compile_protos(&["proto/processes.proto"], &["proto"]) // relative to CARGO_MANIFEST_DIR
        .expect("compile protos");

    // Generate man page
    generate_man_page().expect("man page generation failed");
}

fn generate_man_page() -> std::io::Result<()> {
    let out_dir = PathBuf::from(std::env::var("OUT_DIR").unwrap());
    let man_dir = out_dir.join("man");
    fs::create_dir_all(&man_dir)?;

    // Generate man page for socktop_agent
    let cmd = Cli::command();
    let man = Man::new(cmd);
    let mut buffer = Vec::new();
    man.render(&mut buffer)?;

    fs::write(man_dir.join("socktop_agent.1"), buffer)?;

    println!(
        "cargo:warning=Man page generated at {:?}",
        man_dir.join("socktop_agent.1")
    );

    Ok(())
}