use std::path::*;
use std::process::*;
use std::env;
use std::io::*;

fn main() {
    let mut cflags = env::var("CFLAGS").unwrap_or(String::new());
    let target = env::var("TARGET").unwrap();

    if target.contains("i686") {
        cflags.push_str(" -m32");
    } else if target.contains("x86_64") {
        cflags.push_str(" -m64");
    }

    if !target.contains("i686") {
        cflags.push_str(" -fPIC");
    }

    let src = PathBuf::new(&env::var("CARGO_MANIFEST_DIR").unwrap()).join("libb2-0.96");
    let dst = PathBuf::new(&env::var("OUT_DIR").unwrap());

    run(Command::new("./configure").arg("--prefix").arg(&dst).current_dir(&src), "configure?");
    run(Command::new("make").current_dir(&src), "make");
    run(Command::new("make").arg("install").current_dir(&src), "make");

    println!("cargo:rustc-flags=-l b2:static");
    println!("cargo:rustc-flags=-L {}", dst.join("lib").display());
}

fn run(cmd: &mut Command, program: &str) {
    println!("running: {:?}", cmd);
    let status = match cmd.status() {
        Ok(status) => status,
        Err(ref e) if e.kind() == ErrorKind::FileNotFound => {
            fail(&format!("failed to execute command: {}\nis `{}` not installed?",
                          e, program));
        }
        Err(e) => fail(&format!("failed to execute command: {}", e)),
    };
    if !status.success() {
        fail(&format!("command did not execute successfully, got: {}", status));
    }
}

fn fail(s: &str) -> ! {
    panic!("\n{}\n\nbuild script failed, must exit now", s)
}