use std::{path::PathBuf, process::Command};

fn main() {
    if cfg!(any(feature = "cargo-clippy", docsrs)) {
        return; // skip when clippy or docs is running
    }
    if cfg!(not(target_os = "linux")) {
        println!(
            "cargo:error=The libafl_libfuzzer runtime may only be built for linux; failing fast."
        );
        return;
    }
    println!("cargo:rerun-if-changed=libafl_libfuzzer_runtime/src");
    println!("cargo:rerun-if-changed=libafl_libfuzzer_runtime/Cargo.toml");
    println!("cargo:rerun-if-changed=libafl_libfuzzer_runtime/build.rs");

    let custom_lib_dir =
        PathBuf::from(std::env::var_os("OUT_DIR").unwrap()).join("libafl_libfuzzer");
    std::fs::create_dir_all(&custom_lib_dir)
        .expect("Couldn't create the output directory for the fuzzer runtime build");

    let mut lib_src = PathBuf::from(std::env::var_os("CARGO_MANIFEST_DIR").unwrap());
    lib_src.push("libafl_libfuzzer_runtime");

    let mut command = Command::new(std::env::var_os("CARGO").unwrap());
    command
        .env_remove("RUSTFLAGS")
        .env_remove("CARGO_ENCODED_RUSTFLAGS");

    for (var, _) in std::env::vars() {
        if var.starts_with("CARGO_PKG_") || var.starts_with("CARGO_FEATURE_") {
            command.env_remove(var);
        }
    }

    command
        .env("PATH", std::env::var_os("PATH").unwrap())
        .current_dir(&lib_src);

    command.arg("build");

    let mut features = vec!["serdeany_autoreg"];

    if cfg!(any(feature = "fork")) {
        features.push("fork");
    }
    if cfg!(any(feature = "introspection")) {
        features.push("libafl/introspection");
    }

    command
        .arg("--release")
        .arg("--no-default-features")
        .arg("--target-dir")
        .arg(&custom_lib_dir)
        .arg("--features")
        .arg(features.join(","))
        .arg("--target")
        .arg(std::env::var_os("TARGET").unwrap());

    assert!(
        !command.status().map(|s| !s.success()).unwrap_or(true),
        "Couldn't build runtime crate! Did you remember to use nightly?"
    );

    let mut lib_path = custom_lib_dir.join(std::env::var_os("TARGET").unwrap());
    lib_path.push("release");

    println!(
        "cargo:rustc-link-search=native={}",
        lib_path.to_str().unwrap()
    );
    println!("cargo:rustc-link-lib=static=afl_libfuzzer_runtime");
    println!("cargo:rustc-link-lib=stdc++");
}