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use std::env;
use std::fs::File;
use std::io::BufReader;
use std::path::PathBuf;

#[cfg(target_os = "macos")]
static LASTRUN_PATH: (&str, &str) = ("HOME", "Library/Application Support/Binary Ninja/lastrun");

#[cfg(target_os = "linux")]
static LASTRUN_PATH: (&str, &str) = ("HOME", ".binaryninja/lastrun");

#[cfg(windows)]
static LASTRUN_PATH: (&str, &str) = ("APPDATA", "Binary Ninja\\lastrun");

// Check last run location for path to BinaryNinja; Otherwise check the default install locations
fn link_path() -> PathBuf {
  use std::io::prelude::*;

  let home = PathBuf::from(env::var(LASTRUN_PATH.0).unwrap());
  let lastrun = PathBuf::from(&home).join(LASTRUN_PATH.1);

  File::open(lastrun)
    .and_then(|f| {
      let mut binja_path = String::new();
      let mut reader = BufReader::new(f);

      reader.read_line(&mut binja_path)?;
      Ok(PathBuf::from(binja_path.trim()))
    })
    .unwrap_or_else(|_| {
      #[cfg(target_os = "macos")]
      return PathBuf::from("/Applications/Binary Ninja.app/Contents/MacOS");

      #[cfg(target_os = "linux")]
      return home.join("binaryninja");

      #[cfg(windows)]
      return PathBuf::from(env::var("PROGRAMFILES").unwrap()).join("Vector35\\BinaryNinja\\");
    })
}

fn main() {
  // Use BINARYNINJADIR first for custom BN builds/configurations (BN devs/build server), fallback on defaults
  let install_path = env::var("BINARYNINJADIR")
    .map(PathBuf::from)
    .unwrap_or_else(|_| link_path());

  #[cfg(target_os = "linux")]
  println!(
    "cargo:rustc-link-arg=-Wl,-rpath,{},-L{},-l:libbinaryninjacore.so.1",
    install_path.to_str().unwrap(),
    install_path.to_str().unwrap(),
  );

  #[cfg(target_os = "macos")]
  println!(
    "cargo:rustc-link-arg=-Wl,-rpath,{},-L{},-lbinaryninjacore",
    install_path.to_str().unwrap(),
    install_path.to_str().unwrap(),
  );

  #[cfg(target_os = "windows")]
  {
    println!("cargo:rustc-link-lib=binaryninjacore");
    println!("cargo:rustc-link-search={}", install_path.to_str().unwrap());
  }
}