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

use bindgen;
use cmake;

fn main() {
    // If the static feature is set
    // let st = cfg!(feature = "static");

    // If the docs-only feature is set
    let docs = cfg!(feature = "docs-only");

    // When in docs-only mode don't  build external
    if !docs {
        if !PathBuf::from("transmission/.git").exists() {
            let _ = Command::new("git")
                .args(&["submodule", "update", "--init --recursive"])
                .status();
        }
        // This builds and links the bundled libtransmission
        let dst = cmake::Config::new("transmission")
            // Turn everything we don't want off
            .define("ENABLE_DAEMON", "OFF")
            .define("ENABLE_GTK", "OFF")
            .define("ENABLE_QT", "OFF")
            .define("ENABLE_MAC", "OFF")
            .define("ENABLE_UTILS", "OFF")
            .define("ENABLE_CLI", "OFF")
            .define("ENABLE_TESTS", "OFF")
            .define("ENABLE_LIGHTWEIGHT", "OFF")
            .define("ENABLE_NLS", "OFF")
            .define("INSTALL_DOC", "OFF")
            .define("USE_SYSTEM_DHT", "OFF")
            .define("USE_SYSTEM_MINIUPNPC", "OFF")
            .define("USE_SYSTEM_NATPMP", "OFF")
            .define("USE_SYSTEM_UTP", "OFF")
            .define("USE_SYSTEM_B64", "OFF")
            .define("WITH_INOTIFY", "OFF")
            .define("WITH_KQUEUE", "OFF")
            .define("WITH_LIBAPPINDICATOR", "OFF")
            .define("WITH_SYSTEMD", "OFF")
            // Turn a few things on
            .define("ENABLE_UTP", "ON")
            .define("INSTALL_LIB", "ON")
            .define("WITH_CRYPTO", "openssl")
            // This is until Transmission fixes it
            .define("USE_SYSTEM_EVENT2", "ON")
            .build();
        println!(
            "cargo:rustc-link-search=native={}",
            dst.join("lib64").display()
        );
        println!("cargo:rustc-link-lib=static=transmission");

        // Build and link all the bundled dependencies

        let dst_natpmp = cmake::Config::new("transmission/third-party/libnatpmp").build();
        println!(
            "cargo:rustc-link-search=native={}",
            dst_natpmp.join("lib").display()
        );
        println!("cargo:rustc-link-lib=static=natpmp");

        let dst_utp = cmake::Config::new("transmission/third-party/libutp").build();
        println!(
            "cargo:rustc-link-search=native={}",
            dst_utp.join("lib").display()
        );
        println!("cargo:rustc-link-lib=static=utp");

        let dst_miniupnpc = cmake::Config::new("transmission/third-party/miniupnpc").build();
        println!(
            "cargo:rustc-link-search=native={}",
            dst_miniupnpc.join("lib").display()
        );
        println!("cargo:rustc-link-lib=static=miniupnpc");

        let dst_dht = cmake::Config::new("transmission/third-party/dht").build();
        println!(
            "cargo:rustc-link-search=native={}",
            dst_dht.join("lib").display()
        );
        println!("cargo:rustc-link-lib=static=dht");

        let dst_b64 = cmake::Config::new("transmission/third-party/libb64").build();
        println!(
            "cargo:rustc-link-search=native={}",
            dst_b64.join("lib").display()
        );
        println!("cargo:rustc-link-lib=static=b64");
    }

    // Generate the bindings
    let bindings = bindgen::Builder::default()
        .header("wrapper.h")
        // These are autogenerated so may fail for no reason and are disabled
        .layout_tests(false)
        // Rustify enums
        .default_enum_style(bindgen::EnumVariation::Rust)
        // Format things to make docs clearer
        .rustfmt_bindings(docs)
        .generate()
        .expect("Failed to generate bindings");

    // Write out the bindings
    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
    bindings
        .write_to_file(out_path.join("bindings.rs"))
        .expect("Failed to write bindings");
}