use std::env;
use std::path::PathBuf;
use std::process::Command;

fn main() {
    println!("cargo:rerun-if-changed=build.rs");
    println!("cargo:rerun-if-changed=vendor/libghostty-vt.vendor.json");
    println!("cargo:rerun-if-changed=vendor/libghostty-vt/build.zig");
    println!("cargo:rerun-if-changed=vendor/libghostty-vt/build.zig.zon");
    println!("cargo:rerun-if-changed=vendor/libghostty-vt/VERSION");
    println!("cargo:rerun-if-env-changed=LIBGHOSTTY_VT_OPTIMIZE");

    if env::var_os("CARGO_FEATURE_GHOSTTY_VT").is_none() {
        return;
    }

    let manifest_dir = PathBuf::from(env::var("CARGO_MANIFEST_DIR").expect("CARGO_MANIFEST_DIR"));
    let vendored_dir = manifest_dir.join("vendor/libghostty-vt");
    let optimize = env::var("LIBGHOSTTY_VT_OPTIMIZE").unwrap_or_else(|_| "ReleaseFast".into());

    let status = Command::new("zig")
        .arg("build")
        .arg("-Demit-lib-vt")
        .arg(format!("-Doptimize={optimize}"))
        .current_dir(&vendored_dir)
        .status()
        .expect("failed to execute zig build for vendored libghostty-vt");
    assert!(
        status.success(),
        "zig build for vendored libghostty-vt failed: {status}"
    );

    let lib_dir = vendored_dir.join("zig-out/lib");
    println!("cargo:rustc-link-search=native={}", lib_dir.display());
    println!("cargo:rustc-link-lib=dylib=ghostty-vt");

    let target = env::var("TARGET").expect("TARGET");
    if target.contains("linux") {
        println!("cargo:rustc-link-arg=-Wl,-rpath,{}", lib_dir.display());
    } else if target.contains("apple-darwin") {
        println!("cargo:rustc-link-arg=-Wl,-rpath,{}", lib_dir.display());
    }
}