#!/usr/bin/env bash
set -e

# Temp file and PKGBUILD information
TMPFILE=$(mktemp)
grep -E "pkgname=|pkgver=|pkgrel=|url=|arch=" PKGBUILD > ${TMPFILE}
sed -n -e '/source/,/)/ p' PKGBUILD >> ${TMPFILE}
source ${TMPFILE}
aur_url="ssh://aur@aur.archlinux.org/${pkgname}.git"

# Get new version
if [ $# -eq 1 ]; then
  newver="${1}"
else
  echo "Old version: ${pkgver}"
  read -p "New version: " newver
fi
# Check version
if [ "${newver}" = "${pkgver}" ]; then
  echo >/dev/stderr "Error: same (old) version specified - update aborted"
  exit 1
fi

# Perform variable substitution
sed -i -E "s/^pkgver=\"[^\"]+\"/pkgver=\"$newver\"/" ${TMPFILE}
source ${TMPFILE}

sednewline="n;"
# Iterate over architectures
for architecture in "${arch[@]}"; do
  sednumlines=""
  # Iterate over files listed in $source variable
  eval "sources=(\${source_$architecture[@]})"
  for file_url in "${sources[@]}"; do
    # Remove potential file renaming in source file
    file_url=$(echo ${file_url} | sed 's/.*:://')
    # Perform action only on web links
    if [[ $file_url == http* ]]; then
      # Extract everything after last "/"
      filename="${file_url##*/}"
      # Download new file
      wget -O ${filename} "${file_url}"

      # Calculate checksums
      sha1sum=$(sha1sum ${filename} | awk '{print $1}')
      sha256sum=$(sha256sum ${filename} | awk '{print $1}')
      md5sum=$(md5sum ${filename} | awk '{print $1}')

      # Update PKGBUILD with new values
      sednumlines="${sednumlines}${sednewline}"
      sed -i "/sha1sums_${architecture}/{${sednumlines}s/\".*\"/\"${sha1sum}\"/}" PKGBUILD
      sed -i "/sha256sums_${architecture}/{${sednumlines}s/\".*\"/\"${sha256sum}\"/}" PKGBUILD
      sed -i "/md5sums_${architecture}/{${sednumlines}s/\".*\"/\"${md5sum}\"/}" PKGBUILD
      # Yoink source - not necessary anymore
      rm -f ${filename}
    fi
  done # Files loop
done # Architectures loop

# Update the last PKGBUILD value, the version
sed -i -E "s/^pkgver=\"[^\"]+\"/pkgver=\"$newver\"/" PKGBUILD

# Yoink temp file
rm -f ${TMPFILE}

# Update .SRCINFO
makepkg --printsrcinfo > .SRCINFO

# In case of fire, git commit, git push, leave building
git add PKGBUILD .SRCINFO
git commit -m "Updated ${pkgname} to ${pkgver}-${pkgrel}"
git remote add aur ${aur_url}
git push origin main
git push aur main:master