#!/bin/sh
set -e

gpgkey=''
timestamp="$(LC_ALL=C date -u)"
cachedir='.cache'

# Cleanup
if [ "$1" = 'clean' ]; then
    rm -rf "$cachedir" ChangeLog.txt PACKAGES.TXT MANIFEST.bz2 FILELIST.TXT CHECKSUMS.md5 CHECKSUMS.md5.asc GPG-KEY
    find . -regex '.*\.t[bglx]z$' | while read -r package; do
        pkgbase="$(echo "$package" | sed 's?.*/??;s/\.t[bglx]z$//')"
        rm -f "$(dirname "$package")/$pkgbase.txt"
        rm -f "$package.asc"
    done

    exit
fi

mkdir -p "$cachedir"

# Process all packages
find . -regex '.*\.t[bglx]z$' | while read -r package; do
    case "$package" in
        *.tgz)
            tool=gzip
            ;;
        *.tbz)
            tool=bzip2
            ;;
        *.tlz)
            tool=lzma
            ;;
        *.txz)
            tool=xz
            ;;
    esac

    # See the pkgbase and package_name functions in /sbin/installpkg
    pkgbase="$(echo "$package" | sed 's?.*/??;s/\.t[bglx]z$//')"
    pkgdir="$(dirname "$package")"
    pkgname="$(echo "$pkgbase" | sed 's?-[^-]*-[^-]*-[^-]*$??')"

    pkgtxt="$pkgdir/$pkgbase.txt"
    pkgmeta="$cachedir/$pkgdir/$pkgbase.meta"
    pkgmanifest="$cachedir/$pkgdir/$pkgbase.manifest"
    pkgsize="$cachedir/$pkgdir/$pkgbase.size"
    pkgusize="$cachedir/$pkgdir/$pkgbase.usize"

    pkgsum="$cachedir/$pkgdir/$pkgbase.checksum"

    if [ -f "$pkgtxt" -a \
         -f "$pkgmeta" -a \
         -f "$pkgmanifest" -a \
         -f "$pkgsize" -a \
         -f "$pkgusize" -a \
         -f "$pkgsum" ]; then
        if [ "$gpgkey" ]; then
            if [ -f "$package.asc" ]; then
                md5sum --status -c "$pkgsum" && continue
            fi
        else
            md5sum --status -c "$pkgsum" && continue
        fi
    fi

    echo "Adding $package..."
    mkdir -p "$cachedir/$pkgdir"

    # Decompress the package
    tmppkg="$(mktemp)"
    $tool -cd "$package" > "$tmppkg"

    # Get package size
    du -k "$package" | cut -f 1 > "$pkgsize"
    du -k "$tmppkg" | cut -f 1 > "$pkgusize"

    # Generate .txt file (see /usr/bin/slackdtxt)
    (tar xOf "$tmppkg" install/slack-desc 2> /dev/null || echo "$pkgname:") | egrep -v '^($|#| *\|)' > "$pkgtxt"

    # Create manifest for this package
    cat > "$pkgmanifest" << EOF
++========================================
||
||   Package:  $package
||
++========================================
$(TZ=EST tar tvvf "$tmppkg")


EOF

    # Create metadata for this package
    # Source for the sed line: https://stackoverflow.com/questions/1444406/how-can-i-delete-duplicate-lines-in-a-file-in-unix#1444433
    cat > "$pkgmeta" << EOF
PACKAGE NAME:  $(basename "$package")
PACKAGE LOCATION:  $pkgdir
PACKAGE SIZE (compressed):  $(cat "$pkgsize" | xargs) K
PACKAGE SIZE (uncompressed):  $(cat "$pkgusize" | xargs) K
PACKAGE DESCRIPTION:
$(cat "$pkgtxt" | sed -e '$!N; /^\(.*\)\n\1$/!P; D')

EOF

    # Sign the package
    rm -f "$package.asc"
    [ "$gpgkey" ] && gpg -bas --use-agent --batch -u "$gpgkey" "$package"

    # Remove decompressed package
    rm -f "$tmppkg"

    # Save checksum
    md5sum "$package" > "$pkgsum"
done

# Generate shitty ChangeLog.txt
echo "$timestamp" > ChangeLog.txt

# Create GPG-KEY
if [ "$gpgkey" ]; then
    gpg --list-keys "$gpgkey" > GPG-KEY
    gpg -a --export "$gpgkey" >> GPG-KEY
fi

# Generate PACKAGES.TXT
echo "Generating PACKAGES.TXT..."

cat > PACKAGES.TXT << EOF

PACKAGES.TXT;  $timestamp

This file provides details on the Slackware packages found
in this directory.

Total size of all packages (compressed):  $(expr \( 0$(find "$cachedir" -type f -name '*.size' | xargs cat | xargs printf ' + %s') \) / 1024 || true) MB
Total size of all packages (uncompressed):  $(expr \( 0$(find "$cachedir" -type f -name '*.usize' | xargs cat | xargs printf ' + %s') \) / 1024 || true) MB


EOF

# https://stackoverflow.com/questions/4255603/sort-files-by-basename#4256095
find "$cachedir" -type f -name '*.meta' | perl -e 'print sort{($p=$a)=~s!.*/!!;($q=$b)=~s!.*/!!;$p cmp$q}<>' | xargs cat >> PACKAGES.TXT

echo >> PACKAGES.TXT

# Generate MANIFEST.bz2
echo "Generating MANIFEST.bz2..."
find "$cachedir" -type f -name '*.manifest' | sort | xargs cat | bzip2 -9 -z > MANIFEST.bz2

# Generate FILELIST.TXT
echo "Generating FILELIST.TXT..."

cat > FILELIST.TXT << EOF
$timestamp

Here is the file list for this directory.  If you are using a 
mirror site and find missing or extra files in the disk 
subdirectories, please have the archive administrator refresh
the mirror.

EOF
find . ! -path "./$cachedir/*" -a ! -name "$cachedir" | sort | xargs fakeroot ls -ld --time-style=long-iso > FILELIST.TXT

# Generate CHECKSUMS.md5
echo "Generating CHECKSUMS.md5..."

cat > CHECKSUMS.md5 << EOF
These are the MD5 message digests for the files in this directory.
If you want to test your files, use 'md5sum' and compare the values to
the ones listed here.

To test all these files, use this command:

tail +13 CHECKSUMS.md5 | md5sum -c --quiet - | less

'md5sum' can be found in the GNU coreutils package on ftp.gnu.org in
/pub/gnu, or at any GNU mirror site.

MD5 message digest                Filename
EOF
find . -type f -a ! -path "./$cachedir/*" | sort | xargs md5sum >> CHECKSUMS.md5

# Sign CHECKSUMS.md5
rm -f CHECKSUMS.md5.asc
[ "$gpgkey" ] && gpg -bas --use-agent --batch -u "$gpgkey" CHECKSUMS.md5

# Remove tmpdir
rm -rf "$tmpdir"