#!/usr/bin/env bash

# prints continuous output to avoid timeouts on build systems like Travis
function display_progress {
    local str=""
    while [ "$(ps a | awk '{print $1}' | grep ${1})" ]; do
        printf "%c" "$str"
        sleep 15
        str="."
    done
}

# kills child processes
function die_gracefully {
    trap - EXIT INT
    trap ":" INT  # prevent recursion due to spamming ctrl-c
    echo ""
    trap - TERM && kill -- -$$
}

function mac_toolchain_build {
    set -o pipefail

    # mac only
    if [[ "$(uname)" != "Darwin" ]]; then
        echo "macOS/Darwin required" >&2
        exit 1
    fi

    # vars
    PREFIX="${1:-/usr/local}"
    CREL=$(echo -e "\r"$(tput el))
    if ! MAKEJOBS=$(sysctl -n hw.ncpu 2>/dev/null); then
        MAKEJOBS="4"
    fi
    SUDO=
    TOTAL=6

    # functions
    function print_fail_and_exit {
        echo -en " [FAIL]\n"
        echo "Logs and temporary files remain at: ${TEMP_DIR:-}" >&2
        exit 1
    }

    # permissions
    mkdir -p "${PREFIX}" >/dev/null 2>&1
    if [[ ! -w "${PREFIX}" ]]; then
        if ! sudo -n date >/dev/null 2>&1; then
            echo "sudo is required to install files to ${PREFIX}"
            [[ "${SUDO}" != "" ]] && ${SUDO} -v
        fi
        sudo mkdir -p "${PREFIX}" >/dev/null 2>&1
        if sudo touch "${PREFIX}" >/dev/null 2>&1; then
            SUDO=sudo
        else
            echo "Unable to write to directory: ${PREFIX}" >&2
            exit 1
        fi
    fi
    PREFIX=$(cd "${PREFIX}" && pwd -P)
    PATH_ORIG="${PATH}"
    export PATH="${PREFIX}/bin${PATH:+:$PATH}"

    # temp dir
    TEMP_DIR=$(mktemp -d "${TMPDIR:-/tmp/}toolchain-XXXXXX")
    if [[ $? -ne 0 ]]; then
        echo "Unable to create temporary directory" >&2
        exit 1
    fi
    cd "${TEMP_DIR}"

    # download
    printf "Downloading [%02i/%02i] %s " "1" "${TOTAL}" "autoconf 2.69"
    curl -Lf --connect-timeout 30 https://ftp.gnu.org/gnu/autoconf/autoconf-2.69.tar.gz -o "autoconf-2.69.tar.gz" >/dev/null 2>&1 || print_fail_and_exit
    echo -en "${CREL}"
    printf "Downloading [%02i/%02i] %s " "2" "${TOTAL}" "automake 1.15.1"
    curl -Lf --connect-timeout 30 https://ftp.gnu.org/gnu/automake/automake-1.15.1.tar.gz -o "automake-1.15.1.tar.gz" >/dev/null 2>&1 || print_fail_and_exit
    echo -en "${CREL}"
    printf "Downloading [%02i/%02i] %s " "3" "${TOTAL}" "cmake 3.9.6"
    curl -Lf --connect-timeout 30 https://cmake.org/files/v3.9/cmake-3.9.6.tar.gz -o "cmake-3.9.6.tar.gz" >/dev/null 2>&1 || print_fail_and_exit
    echo -en "${CREL}"
    printf "Downloading [%02i/%02i] %s " "4" "${TOTAL}" "libtool 2.4.6"
    curl -Lf --connect-timeout 30 https://ftp.gnu.org/gnu/libtool/libtool-2.4.6.tar.gz -o "libtool-2.4.6.tar.gz" >/dev/null 2>&1 || print_fail_and_exit
    echo -en "${CREL}"
    printf "Downloading [%02i/%02i] %s " "5" "${TOTAL}" "pkg-config 0.29.2"
    curl -Lf --connect-timeout 30 https://pkg-config.freedesktop.org/releases/pkg-config-0.29.2.tar.gz -o "pkg-config-0.29.2.tar.gz" >/dev/null 2>&1 || print_fail_and_exit
    echo -en "${CREL}"
    printf "Downloading [%02i/%02i] %s " "6" "${TOTAL}" "nasm 2.13.02"
    curl -Lf --connect-timeout 30 https://www.nasm.us/pub/nasm/releasebuilds/2.13.02/nasm-2.13.02.tar.bz2 -o "nasm-2.13.02.tar.bz2" >/dev/null 2>&1 || print_fail_and_exit
    echo -en "${CREL}"
    printf "Downloading [%02i/%02i] complete.\n" "${TOTAL}" "${TOTAL}"

    # autoconf
    cd "${TEMP_DIR}"
    printf "Building    [%02i/%02i] %s " "1" "${TOTAL}" "autoconf 2.69"
    [[ "${SUDO}" != "" ]] && ${SUDO} -v
    tar -xf autoconf-2.69.tar.gz >/dev/null 2>&1 || print_fail_and_exit
    cd autoconf-2.69 >/dev/null 2>&1 || print_fail_and_exit
    ./configure --prefix="${PREFIX}" >../autoconf-2.69.log 2>&1 || print_fail_and_exit
    make --jobs="${MAKEJOBS}" >>../autoconf-2.69.log 2>&1 || print_fail_and_exit
    ${SUDO} make install >>../autoconf-2.69.log 2>&1 || print_fail_and_exit
    echo -en "${CREL}"

    # automake
    cd "${TEMP_DIR}"
    printf "Building    [%02i/%02i] %s " "2" "${TOTAL}" "automake 1.15.1"
    [[ "${SUDO}" != "" ]] && ${SUDO} -v
    tar -xf automake-1.15.1.tar.gz >/dev/null 2>&1 || print_fail_and_exit
    cd automake-1.15.1 >/dev/null 2>&1 || print_fail_and_exit
    ./configure --prefix="${PREFIX}" >../automake-1.15.1.log 2>&1 || print_fail_and_exit
    make --jobs="${MAKEJOBS}" >>../automake-1.15.1.log 2>&1 || print_fail_and_exit
    ${SUDO} make install >>../automake-1.15.1.log 2>&1 || print_fail_and_exit
    echo -en "${CREL}"

    # cmake
    cd "${TEMP_DIR}"
    echo "You may safely dismiss and ignore any prompt to install Java."
    printf "Building    [%02i/%02i] %s " "3" "${TOTAL}" "cmake 3.9.6"
    [[ "${SUDO}" != "" ]] && ${SUDO} -v
    tar -xf cmake-3.9.6.tar.gz >/dev/null 2>&1 || print_fail_and_exit
    cd cmake-3.9.6 >/dev/null 2>&1 || print_fail_and_exit
    ./configure --prefix="${PREFIX}" --no-qt-gui --system-curl >../cmake-3.9.6.log 2>&1 || print_fail_and_exit
    make --jobs="${MAKEJOBS}" >>../cmake-3.9.6.log 2>&1 || print_fail_and_exit
    ${SUDO} make install >>../cmake-3.9.6.log 2>&1 || print_fail_and_exit

    # libtool
    cd "${TEMP_DIR}"
    printf "Building    [%02i/%02i] %s " "4" "${TOTAL}" "libtool 2.4.6"
    [[ "${SUDO}" != "" ]] && ${SUDO} -v
    tar -xf libtool-2.4.6.tar.gz >/dev/null 2>&1 || print_fail_and_exit
    cd libtool-2.4.6 >/dev/null 2>&1 || print_fail_and_exit
    ./configure --prefix="${PREFIX}" >../libtool-2.4.6.log 2>&1 || print_fail_and_exit
    make --jobs="${MAKEJOBS}" >>../libtool-2.4.6.log 2>&1 || print_fail_and_exit
    ${SUDO} make install >>../libtool-2.4.6.log 2>&1 || print_fail_and_exit
    echo -en "${CREL}"

    # pkg-config
    cd "${TEMP_DIR}"
    printf "Building    [%02i/%02i] %s " "5" "${TOTAL}" "pkg-config 0.29.2"
    [[ "${SUDO}" != "" ]] && ${SUDO} -v
    tar -xf pkg-config-0.29.2.tar.gz >/dev/null 2>&1 || print_fail_and_exit
    cd pkg-config-0.29.2 >/dev/null 2>&1 || print_fail_and_exit
    ./configure --prefix="${PREFIX}" --with-internal-glib --disable-host-tool >../pkg-config-0.29.2.log 2>&1 || print_fail_and_exit
    make --jobs="${MAKEJOBS}" >>../pkg-config-0.29.2.log 2>&1 || print_fail_and_exit
    ${SUDO} make install >>../pkg-config-0.29.2.log 2>&1 || print_fail_and_exit
    echo -en "${CREL}"

    # nasm
    cd "${TEMP_DIR}"
    printf "Building    [%02i/%02i] %s " "6" "${TOTAL}" "nasm 2.13.02"
    [[ "${SUDO}" != "" ]] && ${SUDO} -v
    tar -xf nasm-2.13.02.tar.bz2 >/dev/null 2>&1 || print_fail_and_exit
    cd nasm-2.13.02 >/dev/null 2>&1 || print_fail_and_exit
    ./configure --prefix="${PREFIX}" --enable-sections --enable-lto >../nasm-2.13.02.log 2>&1 || print_fail_and_exit
    make --jobs="${MAKEJOBS}" AR=ar RANLIB=ranlib >>../nasm-2.13.02.log 2>&1 || print_fail_and_exit
    ${SUDO} make install >>../nasm-2.13.02.log 2>&1 || print_fail_and_exit
    echo -en "${CREL}"

    # done
    printf "Building    [%02i/%02i] complete.\n" "${TOTAL}" "${TOTAL}"
    rm -rf "${TEMP_DIR}"
    if [[ "${PREFIX}" != "/usr/local" ]]; then
        echo "bin: ${PREFIX}/bin"
        echo "  add to your shell startup script (${HOME}/.bash_profile):"
        echo "    export PATH=\"${PREFIX}/bin:\${PATH}\""
    fi

    # restore original PATH
    export PATH="${PATH_ORIG}"

    set +o pipefail
}

trap die_gracefully EXIT INT TERM

mac_toolchain_build "${@}" &
PID=$!
display_progress "${PID}"
wait "${PID}" || CODE=$?

trap - EXIT INT TERM

exit "${CODE:-0}"