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// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use std::env;
use common::Config;

/// Conversion table from triple OS name to Rust SYSNAME
const OS_TABLE: &'static [(&'static str, &'static str)] = &[("android", "android"),
                                                            ("bitrig", "bitrig"),
                                                            ("darwin", "macos"),
                                                            ("dragonfly", "dragonfly"),
                                                            ("freebsd", "freebsd"),
                                                            ("haiku", "haiku"),
                                                            ("ios", "ios"),
                                                            ("linux", "linux"),
                                                            ("mingw32", "windows"),
                                                            ("netbsd", "netbsd"),
                                                            ("openbsd", "openbsd"),
                                                            ("win32", "windows"),
                                                            ("windows", "windows"),
                                                            ("solaris", "solaris"),
                                                            ("emscripten", "emscripten")];

const ARCH_TABLE: &'static [(&'static str, &'static str)] = &[("aarch64", "aarch64"),
                                                              ("amd64", "x86_64"),
                                                              ("arm", "arm"),
                                                              ("arm64", "aarch64"),
                                                              ("hexagon", "hexagon"),
                                                              ("i386", "x86"),
                                                              ("i686", "x86"),
                                                              ("mips", "mips"),
                                                              ("msp430", "msp430"),
                                                              ("powerpc", "powerpc"),
                                                              ("powerpc64", "powerpc64"),
                                                              ("s390x", "s390x"),
                                                              ("sparc", "sparc"),
                                                              ("x86_64", "x86_64"),
                                                              ("xcore", "xcore"),
                                                              ("asmjs", "asmjs"),
                                                              ("wasm32", "wasm32")];

pub fn get_os(triple: &str) -> &'static str {
    for &(triple_os, os) in OS_TABLE {
        if triple.contains(triple_os) {
            return os;
        }
    }
    panic!("Cannot determine OS from triple");
}
pub fn get_arch(triple: &str) -> &'static str {
    for &(triple_arch, arch) in ARCH_TABLE {
        if triple.contains(triple_arch) {
            return arch;
        }
    }
    panic!("Cannot determine Architecture from triple");
}

pub fn get_env(triple: &str) -> Option<&str> {
    triple.split('-').nth(3)
}

pub fn make_new_path(path: &str) -> String {
    assert!(cfg!(windows));
    // Windows just uses PATH as the library search path, so we have to
    // maintain the current value while adding our own
    match env::var(lib_path_env_var()) {
        Ok(curr) => format!("{}{}{}", path, path_div(), curr),
        Err(..) => path.to_owned(),
    }
}

pub fn lib_path_env_var() -> &'static str {
    "PATH"
}
fn path_div() -> &'static str {
    ";"
}

pub fn logv(config: &Config, s: String) {
    debug!("{}", s);
    if config.verbose {
        println!("{}", s);
    }
}