#!/bin/sh
set -e

. "$1"

if [ -z "$UPSTREAM_ARCHIVE" ]; then exit; fi

NAME_REGEXP="$(echo "$NAME" | sed -E 's,\+,\\+,g')"

case "$NAME" in
ag)
  UPSTREAM_VERSION_PAGE="https://geoff.greer.fm/ag/"
  ;;
bochs)
  UPSTREAM_VERSION_PAGE="https://sourceforge.net/projects/bochs/files/bochs/"
  SEARCH_REGEX="([0-9]+\.[0-9]+(\.[0-9]+)*)/"
  UPSTREAM_SITE_TEMPLATE="https://sourceforge.net/projects/bochs/files/bochs/%v"
  ;;
e2fsprogs)
  UPSTREAM_VERSION_PAGE="https://mirrors.edge.kernel.org/pub/linux/kernel/people/tytso/e2fsprogs/"
  SEARCH_REGEX="v([0-9]+\.[0-9]+(\.[0-9]+)*)/"
  UPSTREAM_SITE_TEMPLATE="https://mirrors.edge.kernel.org/pub/linux/kernel/people/tytso/e2fsprogs/v%v"
  ;;
binutils|gcc|grub|libstdc++)
  VERSION_REGEX="sortix-$NAME_REGEXP-([0-9]+\.[0-9]+(\.[0-9]+)*(-rc[0-9]+)?)"
  ;;
libcurses)
  UPSTREAM_SITE="https://ftp.barfooze.de/pub/sabotage/tarballs"
  ;;
libevent)
  VERSION_REGEX="libevent-([0-9]+\\.[0-9]+(\\.[0-9]+)*-stable)"
  UPSTREAM_SITE_TEMPLATE="https://github.com/libevent/libevent/releases/download/release-%v"
  UPSTREAM_ARCHIVE_TEMPLATE="libevent-%v%e"
  ;;
libexpat)
  UPSTREAM_SITE_TEMPLATE="https://github.com/libexpat/libexpat/releases/download/R_%M_%m_%p"
  ;;
libjpeg)
  UPSTREAM_SITE="https://www.ijg.org/files"
  # TODO: The last letter is optional but sort -V before the first release.
  VERSION_REGEX="jpegsrc.v([0-9]+[a-z])"
  UPSTREAM_ARCHIVE_TEMPLATE="jpegsrc.v%v%e"
  ;;
libgmp)
  VERSION_REGEX=$(echo "$UPSTREAM_ARCHIVE" |
                  sed -E 's,([0-9]+\.[0-9]+(\.[0-9]+)*a?)(\.tar.*),([0-9]+\\.[0-9]+(\\.[0-9]+)*a?),')
  ;;
libpcre)
  UPSTREAM_VERSION_PAGE="https://sourceforge.net/projects/pcre/files/pcre/"
  SEARCH_REGEX="([0-9]+\.[0-9]+(\.[0-9]+)*)/"
  UPSTREAM_SITE_TEMPLATE="https://sourceforge.net/projects/pcre/files/pcre/%v"
  ;;
libpng)
  UPSTREAM_VERSION_PAGE="http://libpng.org/pub/png/libpng.html"
  # TODO: Switch to this upstream site since it also works for older versions.
  UPSTREAM_SITE="https://download.sourceforge.net/libpng"
  ;;
nasm)
  UPSTREAM_VERSION_PAGE="https://www.nasm.us/pub/nasm/releasebuilds/"
  SEARCH_REGEX="([0-9]+\.[0-9]+(\.[0-9]+)*)/"
  UPSTREAM_SITE_TEMPLATE="https://www.nasm.us/pub/nasm/releasebuilds/%v"
  ;;
nyancat)
  UPSTREAM_VERSION_PAGE="https://github.com/klange/nyancat/tags"
  ;;
python)
  UPSTREAM_VERSION_PAGE="https://www.python.org/downloads/source/"
  SEARCH_REGEX="Python-([0-9]+\.[0-9]+(\.[0-9]+)*)(\.tar(\.(gz|bz2|xz)))"
  UPSTREAM_SITE_TEMPLATE="https://www.python.org/ftp/python/%v"
  ;;
esac

TAR_REGEX="(\.tar(\.(gz|bz2|xz)))"

if [ -z "$UPSTREAM_VERSION_PAGE" ]; then
  case "$UPSTREAM_SITE" in
  https://github.com/*/releases/*)
    UPSTREAM_VERSION_PAGE=$(echo "$UPSTREAM_SITE" | grep -Eo '.*/releases/');;
  *) UPSTREAM_VERSION_PAGE="$UPSTREAM_SITE/";;
  esac
fi

if [ -z "$VERSION_REGEX" ]; then
  VERSION_REGEX=$(echo "$UPSTREAM_ARCHIVE" |
                  sed -E 's,([0-9]+\.[0-9]+(\.[0-9]+)*)(\.tar.*),([0-9]+\\.[0-9]+(\\.[0-9]+)*),')
fi

if [ -z "$VERSION" ]; then
  VERSION=$(echo "$UPSTREAM_ARCHIVE" | sed -E "s,$VERSION_REGEX,\1")
fi

if [ -z "$UPSTREAM_SITE_TEMPLATE" ]; then
  UPSTREAM_SITE_TEMPLATE="$UPSTREAM_SITE"
fi

if [ -z "$UPSTREAM_ARCHIVE_TEMPLATE" ]; then
  UPSTREAM_ARCHIVE_TEMPLATE=$(echo "$UPSTREAM_ARCHIVE" |
                  sed -E 's,([0-9]+\.[0-9]+(\.[0-9]+)*)(\.tar.*),%v%e,')
fi

if [ -z "$SEARCH_REGEX" ]; then
  SEARCH_REGEX="\<$VERSION_REGEX$TAR_REGEX\>"
fi

case "$UPSTREAM_ARCHIVE" in
*.tar) EXTENSION=.tar;;
*.tar.gz) EXTENSION=.tar.gz;;
*.tar.bz2) EXTENSION=.tar.bz2;;
*.tar.xz) EXTENSION=.tar.xz;;
esac

instantiate() {
  echo "$1" |
  sed -E \
   -e "s,%v,$2,g" \
   -e "s,%M,$(echo "$2" | sed -E 's,([0-9]+)\.([0-9]+)(\.([0-9]+))?.*,\1,'),g" \
   -e "s,%m,$(echo "$2" | sed -E 's,([0-9]+)\.([0-9]+)(\.([0-9]+))?.*,\2,'),g" \
   -e "s,%p,$(echo "$2" | sed -E 's,([0-9]+)\.([0-9]+)(\.([0-9]+))?.*,\4,'),g" \
   -e "s,%e,$EXTENSION,g"
}

# git tag search

LATEST=$(curl -Ls "$UPSTREAM_VERSION_PAGE" | grep -Eo "$SEARCH_REGEX" | sort -Vu | tail -1)
case "$LATEST" in
*.tar) EXTENSION=.tar;;
*.tar.gz) EXTENSION=.tar.gz;;
*.tar.bz2) EXTENSION=.tar.bz2;;
*.tar.xz) EXTENSION=.tar.xz;;
esac
NEW_VERSION="$(echo "$LATEST" | sed -E "s,$SEARCH_REGEX,\1,")"

if [ -z "$NEW_VERSION" ]; then
  echo "\e[91m$UPSTREAM_ARCHIVE failed to find available versions: $NEW_VERSION_REGEX on $UPSTREAM_VERSION_PAGE\e[m"
  exit 1
fi

NEW_UPSTREAM_SITE=$(instantiate "$UPSTREAM_SITE_TEMPLATE" "$NEW_VERSION")
NEW_UPSTREAM_ARCHIVE=$(instantiate "$UPSTREAM_ARCHIVE_TEMPLATE" "$NEW_VERSION")

if ! wget -q "$NEW_UPSTREAM_SITE/$NEW_UPSTREAM_ARCHIVE" -O /dev/null; then
  echo "\e[91m$NAME failed to download: $NEW_UPSTREAM_SITE/$NEW_UPSTREAM_ARCHIVE\e[m"
  exit 1
fi

if [ "$VERSION" != "$NEW_VERSION" ]; then
  echo "\e[1;92m$NAME $VERSION -> $NEW_VERSION $NEW_UPSTREAM_SITE/$NEW_UPSTREAM_ARCHIVE\e[m"
else
  # Confirmed to actually be up to date.
  case "$NAME" in
  flex|gcc|grub|texinfo|libiconv|libtheora|libSDL|libz|nyancat|pkg-config)
    echo "\e[92m$NAME $VERSION is up to date\e[m"
    ;;
  *)
    echo "$NAME $VERSION is up to date"
    ;;
  esac
fi