#!/bin/bash

# Usage:
#   build-dotnet-tarball [--bootstrap] <tag-from-source-build>
#
# Creates a source archive from a tag (or commit) at github.com/dotnet/source-build

# Source-build is a little strange, we need to clone it, check out the
# tag, build it and then create a tarball from the archive directory
# it creates. Also, it is likely that the source archive is only
# buildable on the OS it was initially created in.

set -euo pipefail
IFS=$'\n\t'

function print_usage {
    echo "Usage:"
    echo "$0 [--bootstrap] <tag-from-source-build>"
    echo
    echo "Creates a source archive from a tag at https://github.com/dotnet/source-build"
    echo ""
    echo "  --bootstrap     build a source tarball usable for bootstrapping .NET"
}

function clean_dotnet_cache {
    rm -rf ~/.aspnet ~/.dotnet/ ~/.nuget/ ~/.local/share/NuGet ~/.templateengine
    rm -rf /tmp/NuGet /tmp/NuGetScratch /tmp/.NETCore* /tmp/.NETStandard* /tmp/.dotnet /tmp/dotnet.* /tmp/clr-debug-pipe* /tmp/Razor-Server /tmp/CoreFxPipe* /tmp/VBCSCompiler /tmp/.NETFramework*
}

function check_bootstrap_environment {
    if rpm -qa | grep libunwind-devel; then
        echo "error: libunwind-devel is installed. Not a good idea for bootstrapping."
        exit 1
    fi
    if rpm -qa | grep dotnet ; then
        echo "error: dotnet is installed. Not a good idea for bootstrapping."
        exit 1
    fi
    if [ -d /usr/lib/dotnet ] || [ -d /usr/lib64/dotnet ] || [ -d /usr/share/dotnet ] ; then
        echo "error: one of /usr/lib/dotnet /usr/lib64/dotnet or /usr/share/dotnet/ exists. Not a good idea for bootstrapping."
        exit 1
    fi
    if command -v dotnet ; then
        echo "error: dotnet is in $PATH. Not a good idea for bootstrapping."
        exit 1
    fi
}

function runtime_id {

    source /etc/os-release
    case "${ID}" in
        # Remove the RHEL minor version
        rhel) rid_version=${VERSION_ID%.*} ;;

        *) rid_version=${VERSION_ID} ;;
    esac

    echo "${ID}.${rid_version}-${arch}"
}

build_bootstrap=false

declare -A archmap
archmap=(
    ["aarch64"]="arm64"
    ["amd64"]="x64"
    ["armv8l"]="arm"
    ["i686"]="x86"
    ["i386"]="x86"
    ["x86_64"]="x64"
)

arch=${archmap["$(uname -m)"]}


positional_args=()
while [[ "$#" -gt 0 ]]; do
    arg="${1}"
    case "${arg}" in
        --bootstrap)
            build_bootstrap=true
            shift
            ;;
        -h|--help)
            print_usage
            exit 0
            ;;
        *)
            positional_args+=("$1")
            shift
            ;;
    esac
done


tag=${positional_args[0]:-}
if [[ -z ${tag} ]]; then
    echo "error: missing tag to build"
    exit 1
fi

set -x

dir_name="dotnet-${tag}"
unmodified_tarball_name="${dir_name}-original"
tarball_name="${dir_name}"

if [[ ${build_bootstrap} == true ]]; then
    unmodified_tarball_name="${unmodified_tarball_name}-${arch}-bootstrap"
    tarball_name="${tarball_name}-${arch}-bootstrap"
fi

if [ -f "${tarball_name}.tar.gz" ]; then
    echo "error: ${tarball_name}.tar.gz already exists"
    exit 1
fi

if [ ! -f "${unmodified_tarball_name}.tar.gz" ]; then
    temp_dir=$(mktemp -d -p "$(pwd)")
    pushd "${temp_dir}"
    git clone https://github.com/dotnet/source-build
    pushd source-build
    git checkout "${tag}"
    git submodule update --init --recursive
    clean_dotnet_cache
    # FIXME remove contineuonprebuilterror
    ./build.sh -p:SkipPrebuiltEnforcement=true -p:ContinueOnPrebuiltBaselineError=true -p:ArchiveDownloadedPackages=true -p:UseSystemLibraries=true -p:UseSystemLibunwind=false
    ./build-source-tarball.sh "${unmodified_tarball_name}" --skip-build -- -p:ContinueOnPrebuiltBaselineError=true -p:SkipPrebuiltEnforcement=true

    if [[ ${build_bootstrap} == true ]]; then
        cp -a artifacts/"${arch}"/Release/Private.SourceBuilt.Artifacts.*.tar.gz "${unmodified_tarball_name}"/packages/archive/Private.SourceBuilt.Artifacts.*.tar.gz
    fi
    popd
    popd

    tar czf "${unmodified_tarball_name}.tar.gz" -C "${temp_dir}/source-build" "${unmodified_tarball_name}"

    rm -rf "${temp_dir}"
fi

rm -rf "${tarball_name}"
tar xf "${unmodified_tarball_name}.tar.gz"
mv "${unmodified_tarball_name}" "${tarball_name}"

pushd "${tarball_name}"

if [[ ${build_bootstrap} != true ]]; then
    find . -type f -iname '*.tar.gz' -delete
    rm -rf .dotnet
fi

# Remove files with funny licenses, crypto implementations and other
# not-very-useful artifacts to reduce tarball size
rm -r src/aspnetcore.*/src/SignalR/clients/java/signalr/gradle*
find src/aspnetcore.*/src -type d -name samples -print0 | xargs -0 rm -r
rm -r src/NuGet.Client.*/test/EndToEnd
rm -r src/runtime.*/src/mono/
rm -r src/Humanizer.*/samples/

# FIXME delete when upstream has a new release with this file fixed
if ! grep "RSA Data Security" src/runtime.*/src/libraries/System.Security.Cryptography.Algorithms/src/Internal/Cryptography/SHAHashProvider.Browser.cs; then
    echo "SHAHashProvider.Browser.cs has been fixed upstream. Please fix build-dotnet-tarball"
    exit 1
fi
# Delete the bad source
rm src/runtime.*/src/libraries/System.Security.Cryptography.Algorithms/src/Internal/Cryptography/SHAHashProvider.Browser.cs
# Delete the patch that modifies the bad source
rm patches/runtime/0001-Use-substitute-SHA-1-implementation-in-wasm-44982.patch
# Add pre-patched copy
cp ../SHAHashProvider.Browser.cs src/runtime.*/src/libraries/System.Security.Cryptography.Algorithms/src/Internal/Cryptography/

popd

tar czf "${tarball_name}.tar.gz" "${tarball_name}"