extern crate bindgen;

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

fn main() {
    let src = PathBuf::from(&env::var("CARGO_MANIFEST_DIR").unwrap());
    let dest = PathBuf::from(&env::var("OUT_DIR").unwrap());
    let build = dest.join("build");

    let _ = fs::create_dir(&build);

    let mut cmd = Command::new("cmake");
    cmd
        .arg(&src.join("libftdi"))
        .arg("-DCFLAGS=-fPIC")
        .arg("-DSTATICLIBS=ON")
        .arg("-DBUILD_TESTS=OFF")
        .arg("-DDOCUMENTATION=OFF")
        .arg("-DEXAMPLES=OFF")
        .arg("-DFTDI_EEPROM=OFF")
        .arg("-DPYTHON_BINDINGS=OFF")
        .arg("-DLINK_PYTHON_LIBRARY=OFF")
        .arg(&format!("-DCMAKE_INSTALL_PREFIX={}", dest.display()))
        .env("CFLAGS", "-fPIC")
        .current_dir(&build);
    run(&mut cmd);

    run(Command::new("cmake")
        .arg("--build").arg(".")
        .arg("--target").arg("install")
        .current_dir(&build));

    println!("cargo:root={}", dest.display());

    // the static library isn't installed
    println!("cargo:rustc-flags=-l static=ftdi1");
    println!("cargo:rustc-flags=-L {}", dest.join("lib").display());

    let header = dest.join("include").join("libftdi1").join("ftdi.h");

    // Tell cargo to invalidate the built crate whenever the wrapper changes
    println!("cargo:rerun-if-changed={}", header.display());

    // The bindgen::Builder is the main entry point
    // to bindgen, and lets you build up options for
    // the resulting bindings.
    let bindings = bindgen::Builder::default()
        // The input header we would like to generate
        // bindings for.
        .header(header.to_str().unwrap())
        // Tell cargo to invalidate the built crate whenever any of the
        // included header files changed.
        .parse_callbacks(Box::new(bindgen::CargoCallbacks))
        // Finish the builder and generate the bindings.
        .derive_default(true)
        .default_enum_style(bindgen::EnumVariation::Rust {
            non_exhaustive: false,
        })
        .bitfield_enum("ftdi_mpsse_mode")
        .generate()
        // Unwrap the Result and panic on failure.
        .expect("Unable to generate bindings");

    // Write the bindings to the $OUT_DIR/bindings.rs file.
    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
    bindings
        .write_to_file(out_path.join("bindings.rs"))
        .expect("Couldn't write bindings!");
}

fn run(cmd: &mut Command) {
    let status = match cmd.status() {
        Ok(status) => status,
        Err(ref e) => panic!("Failed to execute command: {}", e),
    };

    if !status.success() {
        panic!("Command did not execute successfully: exit {}", status);
    }
}