#!/usr/bin/env bash

set -euo pipefail

build_and_install() {
    if [ $older_release -eq 1 ]; then
        make extra_inc=big_iron.inc work_dir="$PWD"/ tbb_root="$PWD"

        if [ -d /usr/lib/x86_64-linux-gnu ]; then
            LIBS=lib/x86_64-linux-gnu
        elif [ -d /usr/lib/aarch64-linux-gnu ]; then
            LIBS=lib/aarch64-linux-gnu
        elif [ -d /usr/lib/arm-linux-gnueabihf ]; then
            LIBS=lib/arm-linux-gnu
        fi

        PC_FILE=/usr/${LIBS}/pkgconfig/tbb.pc
        echo "prefix=/usr" > "${PC_FILE}"
        echo "exec_prefix=\${prefix}" >> "${PC_FILE}"
        echo "libdir=\${exec_prefix}/lib/${LIBS}" >> "${PC_FILE}"
        echo "includedir=\${prefix}/include" >> "${PC_FILE}"
        echo "Name: Threading Building Blocks" >> "${PC_FILE}"
        echo "Description: Intel's parallelism library for C++" >> "${PC_FILE}"
        echo "URL: http://www.threadingbuildingblocks.org/" >> "${PC_FILE}"
        echo "Version: v2020.3.3" >> "${PC_FILE}"
        echo "Libs: -ltbb -latomic" >> "${PC_FILE}"
        echo "Cflags: -I\${includedir}" >> "${PC_FILE}"

        cp _release/*.a /usr/"${LIBS}"/
        cp -r include/* /usr/include/
    else
        cmake -B build -DCMAKE_INSTALL_PREFIX=/usr/local \
            -DCMAKE_CXX_FLAGS="-Wno-stringop-overflow" \
            -DTBB_TEST=OFF -DBUILD_SHARED_LIBS=OFF -GNinja .
        ninja -C build install
    fi
}

prepare_source() {
    DIR=tbb
    cd /tmp
    [ -d ./${DIR} ] && rm -rf ./${DIR}
    mkdir ${DIR}

    if [ $older_release -eq 1 ]; then
        TBB_RELEASE="v2020.3.3"
    else
        TBB_RELEASE=$(curl -sL "https://api.github.com/repos/uxlfoundation/oneTBB/releases/latest" \
        | grep '"tag_name":' | sed -E 's/.*"tag_name": "([^"]+)".*/\1/')
    fi

    curl -Ls "https://github.com/uxlfoundation/oneTBB/archive/${TBB_RELEASE}.tar.gz" | \

    tar xzvf - -C ${DIR}/ --strip-components=1
    cd ${DIR}
}

older_release=0
if grep -q 'Ubuntu 20.04\|Debian GNU/Linux 11' /etc/os-release 2>/dev/null; then
    older_release=1
fi

prepare_source
build_and_install