// Copyright 2017 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

use std::path::PathBuf;
use std::env;
use utils::is_mac;

error_chain!{}

pub fn fuchsia_root() -> Result<PathBuf> {
    let fuchsia_root_value = env::var("FUCHSIA_ROOT").chain_err(|| {
            "FUCHSIA_ROOT not set. You must set the environmental variable FUCHSIA_ROOT to point \
             to a Fuchsia tree with a debug-x86-64 build including the rust module"
        })?;

    Ok(PathBuf::from(fuchsia_root_value))
}

fn rust_buildtools_path() -> Result<PathBuf> {
    let platform_name = if is_mac() {
        "rust-x86_64-apple-darwin"
    } else {
        "rust-x86_64-unknown-linux-gnu"
    };
    Ok(fuchsia_root()?.join("buildtools/rust").join(platform_name))
}

pub fn rust_c_path() -> Result<PathBuf> {
    Ok(rust_buildtools_path()?.join("bin/rustc"))
}

pub fn rust_linker_path() -> Result<PathBuf> {
    Ok(fuchsia_root()?.join("out/debug-x86-64/host_x64/x86_64-unknown-fuchsia-cc"))
}

pub fn strip_tool_path() -> Result<PathBuf> {
    let platform_name = if is_mac() {
        "clang+llvm-x86_64-darwin"
    } else {
        "clang+llvm-x86_64-linux"
    };
    Ok(fuchsia_root()?.join("buildtools/toolchain").join(platform_name).join("bin/strip"))
}