#!/usr/bin/env bash

set -e

usage()
{
    echo "Usage: $0 [BuildArch] [CodeName] [lldbx.y] [--skipunmount] --rootfsdir <directory>]"
    echo "BuildArch can be: arm(default), armel, arm64, x86"
    echo "CodeName - optional, Code name for Linux, can be: xenial(default), zesty, bionic, alpine, alpine3.9 or alpine3.13. If BuildArch is armel, LinuxCodeName is jessie(default) or tizen."
    echo "                              for FreeBSD can be: freebsd11, freebsd12, freebsd13"
    echo "                              for illumos can be: illumos."
    echo "lldbx.y - optional, LLDB version, can be: lldb3.9(default), lldb4.0, lldb5.0, lldb6.0 no-lldb. Ignored for alpine and FreeBSD"
    echo "--skipunmount - optional, will skip the unmount of rootfs folder."
    echo "--use-mirror - optional, use mirror URL to fetch resources, when available."
    exit 1
}

__CodeName=xenial
__CrossDir=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
__InitialDir=$PWD
__BuildArch=arm
__AlpineArch=armv7
__QEMUArch=arm
__UbuntuArch=armhf
__UbuntuRepo="http://ports.ubuntu.com/"
__LLDB_Package="liblldb-3.9-dev"
__SkipUnmount=0

# base development support
__UbuntuPackages="build-essential"

__AlpinePackages="alpine-base"
__AlpinePackages+=" build-base"
__AlpinePackages+=" linux-headers"
__AlpinePackagesEdgeCommunity=" lldb-dev"
__AlpinePackagesEdgeMain+=" python3"
__AlpinePackagesEdgeMain+=" libedit"

# symlinks fixer
__UbuntuPackages+=" symlinks"

# CoreCLR and CoreFX dependencies
__UbuntuPackages+=" libicu-dev"
__UbuntuPackages+=" liblttng-ust-dev"
__UbuntuPackages+=" libunwind8-dev"

__AlpinePackages+=" gettext-dev"
__AlpinePackages+=" icu-dev"
__AlpinePackages+=" libunwind-dev"
__AlpinePackages+=" lttng-ust-dev"

# CoreFX dependencies
__UbuntuPackages+=" libcurl4-openssl-dev"
__UbuntuPackages+=" libkrb5-dev"
__UbuntuPackages+=" libssl-dev"
__UbuntuPackages+=" zlib1g-dev"

__AlpinePackages+=" curl-dev"
__AlpinePackages+=" krb5-dev"
__AlpinePackages+=" openssl-dev"
__AlpinePackages+=" zlib-dev"

__FreeBSDBase="12.2-RELEASE"
__FreeBSDPkg="1.12.0"
__FreeBSDABI="12"
__FreeBSDPackages="libunwind"
__FreeBSDPackages+=" icu"
__FreeBSDPackages+=" libinotify"
__FreeBSDPackages+=" lttng-ust"
__FreeBSDPackages+=" krb5"
__FreeBSDPackages+=" terminfo-db"

__IllumosPackages="icu-64.2nb2"
__IllumosPackages+=" mit-krb5-1.16.2nb4"
__IllumosPackages+=" openssl-1.1.1e"
__IllumosPackages+=" zlib-1.2.11"

# ML.NET dependencies
__UbuntuPackages+=" libomp5"
__UbuntuPackages+=" libomp-dev"

__UseMirror=0

__UnprocessedBuildArgs=
while :; do
    if [ $# -le 0 ]; then
        break
    fi

    lowerI="$(echo $1 | tr "[:upper:]" "[:lower:]")"
    case $lowerI in
        -?|-h|--help)
            usage
            exit 1
            ;;
        arm)
            __BuildArch=arm
            __UbuntuArch=armhf
            __AlpineArch=armv7
            __QEMUArch=arm
            ;;
        arm64)
            __BuildArch=arm64
            __UbuntuArch=arm64
            __AlpineArch=aarch64
            __QEMUArch=aarch64
            ;;
        armel)
            __BuildArch=armel
            __UbuntuArch=armel
            __UbuntuRepo="http://ftp.debian.org/debian/"
            __CodeName=jessie
            ;;
        s390x)
            __BuildArch=s390x
            __UbuntuArch=s390x
            __UbuntuRepo="http://ports.ubuntu.com/ubuntu-ports/"
            __UbuntuPackages=$(echo ${__UbuntuPackages} | sed 's/ libunwind8-dev//')
            __UbuntuPackages=$(echo ${__UbuntuPackages} | sed 's/ libomp-dev//')
            __UbuntuPackages=$(echo ${__UbuntuPackages} | sed 's/ libomp5//')
            unset __LLDB_Package
            ;;
        x86)
            __BuildArch=x86
            __UbuntuArch=i386
            __UbuntuRepo="http://archive.ubuntu.com/ubuntu/"
            ;;
        lldb3.6)
            __LLDB_Package="lldb-3.6-dev"
            ;;
        lldb3.8)
            __LLDB_Package="lldb-3.8-dev"
            ;;
        lldb3.9)
            __LLDB_Package="liblldb-3.9-dev"
            ;;
        lldb4.0)
            __LLDB_Package="liblldb-4.0-dev"
            ;;
        lldb5.0)
            __LLDB_Package="liblldb-5.0-dev"
            ;;
        lldb6.0)
            __LLDB_Package="liblldb-6.0-dev"
            ;;
        no-lldb)
            unset __LLDB_Package
            ;;
        xenial) # Ubuntu 16.04
            if [ "$__CodeName" != "jessie" ]; then
                __CodeName=xenial
            fi
            ;;
        zesty) # Ubuntu 17.04
            if [ "$__CodeName" != "jessie" ]; then
                __CodeName=zesty
            fi
            ;;
        bionic) # Ubuntu 18.04
            if [ "$__CodeName" != "jessie" ]; then
                __CodeName=bionic
            fi
            ;;
        jessie) # Debian 8
            __CodeName=jessie
            __UbuntuRepo="http://ftp.debian.org/debian/"
            ;;
        stretch) # Debian 9
            __CodeName=stretch
            __UbuntuRepo="http://ftp.debian.org/debian/"
            __LLDB_Package="liblldb-6.0-dev"
            ;;
        buster) # Debian 10
            __CodeName=buster
            __UbuntuRepo="http://ftp.debian.org/debian/"
            __LLDB_Package="liblldb-6.0-dev"
            ;;
        tizen)
            if [ "$__BuildArch" != "armel" ] && [ "$__BuildArch" != "arm64" ]; then
                echo "Tizen is available only for armel and arm64."
                usage;
                exit 1;
            fi
            __CodeName=
            __UbuntuRepo=
            __Tizen=tizen
            ;;
        alpine|alpine3.9)
            __CodeName=alpine
            __UbuntuRepo=
            __AlpineVersion=3.9
            __AlpinePackagesEdgeMain+=" llvm11-libs"
            __AlpinePackagesEdgeMain+=" clang-libs"
            ;;
        alpine3.13)
            __CodeName=alpine
            __UbuntuRepo=
            __AlpineVersion=3.13
            # Alpine 3.13 has all the packages we need in the 3.13 repository
            __AlpinePackages+=$__AlpinePackagesEdgeCommunity
            __AlpinePackagesEdgeCommunity=
            __AlpinePackages+=$__AlpinePackagesEdgeMain
            __AlpinePackagesEdgeMain=
            __AlpinePackages+=" llvm10-libs"
            ;;
        freebsd11)
            __FreeBSDBase="11.3-RELEASE"
            __FreeBSDABI="11"
            ;&
        freebsd12)
            __CodeName=freebsd
            __BuildArch=x64
            __SkipUnmount=1
            ;;
        freebsd13)
            __CodeName=freebsd
            __FreeBSDBase="13.0-RELEASE"
            __FreeBSDABI="13"
            __BuildArch=x64
            __SkipUnmount=1
            ;;
        illumos)
            __CodeName=illumos
            __BuildArch=x64
            __SkipUnmount=1
            ;;
        --skipunmount)
            __SkipUnmount=1
            ;;
        --rootfsdir|-rootfsdir)
            shift
            __RootfsDir=$1
            ;;
        --use-mirror)
            __UseMirror=1
            ;;
        *)
            __UnprocessedBuildArgs="$__UnprocessedBuildArgs $1"
            ;;
    esac

    shift
done

if [ "$__BuildArch" == "armel" ]; then
    __LLDB_Package="lldb-3.5-dev"
fi
__UbuntuPackages+=" ${__LLDB_Package:-}"

if [ -z "$__RootfsDir" ] && [ ! -z "$ROOTFS_DIR" ]; then
    __RootfsDir=$ROOTFS_DIR
fi

if [ -z "$__RootfsDir" ]; then
    __RootfsDir="$__CrossDir/../../../.tools/rootfs/$__BuildArch"
fi

if [ -d "$__RootfsDir" ]; then
    if [ $__SkipUnmount == 0 ]; then
        umount $__RootfsDir/* || true
    fi
    rm -rf $__RootfsDir
fi

mkdir -p $__RootfsDir
__RootfsDir="$( cd "$__RootfsDir" && pwd )"

if [[ "$__CodeName" == "alpine" ]]; then
    __ApkToolsVersion=2.9.1
    __ApkToolsDir=$(mktemp -d)
    wget https://github.com/alpinelinux/apk-tools/releases/download/v$__ApkToolsVersion/apk-tools-$__ApkToolsVersion-x86_64-linux.tar.gz -P $__ApkToolsDir
    tar -xf $__ApkToolsDir/apk-tools-$__ApkToolsVersion-x86_64-linux.tar.gz -C $__ApkToolsDir
    mkdir -p $__RootfsDir/usr/bin
    cp -v /usr/bin/qemu-$__QEMUArch-static $__RootfsDir/usr/bin

    $__ApkToolsDir/apk-tools-$__ApkToolsVersion/apk \
      -X http://dl-cdn.alpinelinux.org/alpine/v$__AlpineVersion/main \
      -X http://dl-cdn.alpinelinux.org/alpine/v$__AlpineVersion/community \
      -U --allow-untrusted --root $__RootfsDir --arch $__AlpineArch --initdb \
      add $__AlpinePackages

    if [[ -n "$__AlpinePackagesEdgeMain" ]]; then
      $__ApkToolsDir/apk-tools-$__ApkToolsVersion/apk \
        -X http://dl-cdn.alpinelinux.org/alpine/edge/main \
        -U --allow-untrusted --root $__RootfsDir --arch $__AlpineArch --initdb \
        add $__AlpinePackagesEdgeMain
    fi

    if [[ -n "$__AlpinePackagesEdgeCommunity" ]]; then
      $__ApkToolsDir/apk-tools-$__ApkToolsVersion/apk \
        -X http://dl-cdn.alpinelinux.org/alpine/edge/community \
        -U --allow-untrusted --root $__RootfsDir --arch $__AlpineArch --initdb \
        add $__AlpinePackagesEdgeCommunity
    fi

    rm -r $__ApkToolsDir
elif [[ "$__CodeName" == "freebsd" ]]; then
    mkdir -p $__RootfsDir/usr/local/etc
    JOBS="$(getconf _NPROCESSORS_ONLN)"
    wget -O - https://download.freebsd.org/ftp/releases/amd64/${__FreeBSDBase}/base.txz | tar -C $__RootfsDir -Jxf - ./lib ./usr/lib ./usr/libdata ./usr/include ./usr/share/keys ./etc ./bin/freebsd-version
    echo "ABI = \"FreeBSD:${__FreeBSDABI}:amd64\"; FINGERPRINTS = \"${__RootfsDir}/usr/share/keys\"; REPOS_DIR = [\"${__RootfsDir}/etc/pkg\"]; REPO_AUTOUPDATE = NO; RUN_SCRIPTS = NO;" > ${__RootfsDir}/usr/local/etc/pkg.conf
    echo "FreeBSD: { url: "pkg+http://pkg.FreeBSD.org/\${ABI}/quarterly", mirror_type: \"srv\", signature_type: \"fingerprints\", fingerprints: \"${__RootfsDir}/usr/share/keys/pkg\", enabled: yes }" > ${__RootfsDir}/etc/pkg/FreeBSD.conf
    mkdir -p $__RootfsDir/tmp
    # get and build package manager
    wget -O -  https://github.com/freebsd/pkg/archive/${__FreeBSDPkg}.tar.gz  |  tar -C $__RootfsDir/tmp -zxf -
    cd $__RootfsDir/tmp/pkg-${__FreeBSDPkg}
    # needed for install to succeed
    mkdir -p $__RootfsDir/host/etc
    ./autogen.sh && ./configure --prefix=$__RootfsDir/host && make -j "$JOBS" && make install
    rm -rf $__RootfsDir/tmp/pkg-${__FreeBSDPkg}
    # install packages we need.
    INSTALL_AS_USER=$(whoami) $__RootfsDir/host/sbin/pkg -r $__RootfsDir -C $__RootfsDir/usr/local/etc/pkg.conf update
    INSTALL_AS_USER=$(whoami) $__RootfsDir/host/sbin/pkg -r $__RootfsDir -C $__RootfsDir/usr/local/etc/pkg.conf install --yes $__FreeBSDPackages
elif [[ "$__CodeName" == "illumos" ]]; then
    mkdir "$__RootfsDir/tmp"
    pushd "$__RootfsDir/tmp"
    JOBS="$(getconf _NPROCESSORS_ONLN)"
    echo "Downloading sysroot."
    wget -O - https://github.com/illumos/sysroot/releases/download/20181213-de6af22ae73b-v1/illumos-sysroot-i386-20181213-de6af22ae73b-v1.tar.gz | tar -C "$__RootfsDir" -xzf -
    echo "Building binutils. Please wait.."
    wget -O - https://ftp.gnu.org/gnu/binutils/binutils-2.33.1.tar.bz2 | tar -xjf -
    mkdir build-binutils && cd build-binutils
    ../binutils-2.33.1/configure --prefix="$__RootfsDir" --target="x86_64-sun-solaris2.10" --program-prefix="x86_64-illumos-" --with-sysroot="$__RootfsDir"
    make -j "$JOBS" && make install && cd ..
    echo "Building gcc. Please wait.."
    wget -O - https://ftp.gnu.org/gnu/gcc/gcc-8.4.0/gcc-8.4.0.tar.xz | tar -xJf -
    CFLAGS="-fPIC"
    CXXFLAGS="-fPIC"
    CXXFLAGS_FOR_TARGET="-fPIC"
    CFLAGS_FOR_TARGET="-fPIC"
    export CFLAGS CXXFLAGS CXXFLAGS_FOR_TARGET CFLAGS_FOR_TARGET
    mkdir build-gcc && cd build-gcc
    ../gcc-8.4.0/configure --prefix="$__RootfsDir" --target="x86_64-sun-solaris2.10" --program-prefix="x86_64-illumos-" --with-sysroot="$__RootfsDir" --with-gnu-as       \
        --with-gnu-ld --disable-nls --disable-libgomp --disable-libquadmath --disable-libssp --disable-libvtv --disable-libcilkrts --disable-libada --disable-libsanitizer \
        --disable-libquadmath-support --disable-shared --enable-tls
    make -j "$JOBS" && make install && cd ..
    BaseUrl=https://pkgsrc.joyent.com
    if [[ "$__UseMirror" == 1 ]]; then
        BaseUrl=http://pkgsrc.smartos.skylime.net
    fi
    BaseUrl="$BaseUrl"/packages/SmartOS/2020Q1/x86_64/All
    echo "Downloading dependencies."
    read -ra array <<<"$__IllumosPackages"
    for package in "${array[@]}"; do
       echo "Installing $package..."
        wget "$BaseUrl"/"$package".tgz
        ar -x "$package".tgz
        tar --skip-old-files -xzf "$package".tmp.tgz -C "$__RootfsDir" 2>/dev/null
    done
    echo "Cleaning up temporary files."
    popd
    rm -rf "$__RootfsDir"/{tmp,+*}
    mkdir -p "$__RootfsDir"/usr/include/net
    mkdir -p "$__RootfsDir"/usr/include/netpacket
    wget -P "$__RootfsDir"/usr/include/net https://raw.githubusercontent.com/illumos/illumos-gate/master/usr/src/uts/common/io/bpf/net/bpf.h
    wget -P "$__RootfsDir"/usr/include/net https://raw.githubusercontent.com/illumos/illumos-gate/master/usr/src/uts/common/io/bpf/net/dlt.h
    wget -P "$__RootfsDir"/usr/include/netpacket https://raw.githubusercontent.com/illumos/illumos-gate/master/usr/src/uts/common/inet/sockmods/netpacket/packet.h
    wget -P "$__RootfsDir"/usr/include/sys https://raw.githubusercontent.com/illumos/illumos-gate/master/usr/src/uts/common/sys/sdt.h
elif [[ -n $__CodeName ]]; then
    qemu-debootstrap --arch $__UbuntuArch $__CodeName $__RootfsDir $__UbuntuRepo
    cp $__CrossDir/$__BuildArch/sources.list.$__CodeName $__RootfsDir/etc/apt/sources.list
    chroot $__RootfsDir apt-get update
    chroot $__RootfsDir apt-get -f -y install
    chroot $__RootfsDir apt-get -y install $__UbuntuPackages
    chroot $__RootfsDir symlinks -cr /usr
    chroot $__RootfsDir apt-get clean

    if [ $__SkipUnmount == 0 ]; then
        umount $__RootfsDir/* || true
    fi

    if [[ "$__BuildArch" == "armel" && "$__CodeName" == "jessie" ]]; then
        pushd $__RootfsDir
        patch -p1 < $__CrossDir/$__BuildArch/armel.jessie.patch
        popd
    fi
elif [[ "$__Tizen" == "tizen" ]]; then
    ROOTFS_DIR=$__RootfsDir $__CrossDir/$__BuildArch/tizen-build-rootfs.sh
else
    echo "Unsupported target platform."
    usage;
    exit 1
fi