#!/usr/bin/env bash
#
# mfpub
#
# Use Jekyll to generate Marlin Documentation, which is then
# git-pushed to Github to publish it to the live site.
# This publishes the current branch, and doesn't force
# changes to be pushed to the 'master' branch. Be sure to
# push any permanent changes to 'master'.
#

[[ $# < 2 && $1 != "-h" && $1 != "--help" ]] || { echo "Usage: `basename $0` [branch]" 1>&2 ; exit 1; }

MFINFO=$(mfinfo "$@") || exit 1
IFS=' ' read -a INFO <<< "$MFINFO"
ORG=${INFO[0]}
FORK=${INFO[1]}
REPO=${INFO[2]}
TARG=${INFO[3]}
BRANCH=${INFO[4]}
CURR=${INFO[5]}

if [[ $ORG != "MarlinFirmware" || $REPO != "MarlinDocumentation" ]]; then
  echo "Wrong repository."
  exit
fi

if [[ $BRANCH == "gh-pages" ]]; then
  echo "Can't build from 'gh-pages.' Only the Jekyll branches (based on 'master')."
  exit
fi

# Check out the named branch (or stay in current)

if [[ $BRANCH != $CURR ]]; then
  echo "Stashing any changes to files..."
  [[ $(git stash) != "No local "* ]] && HAS_STASH=1
  git checkout $BRANCH
fi

COMMIT=$( git log --format="%H" -n 1 )

# Clean out changes and other junk in the branch
git clean -d -f

opensite() {
  URL="$1"
  OPEN=$(echo $(which gnome-open xdg-open open) | awk '{ print $1 }')
  if [ -z "$OPEN" ]; then
    echo "Can't find a tool to open the URL:"
    echo $URL
  else
    echo "Opening the site in the browser..."
    "$OPEN" "$URL"
  fi
}

# Push 'master' to the fork and make a proper PR...
if [[ $BRANCH == $TARG ]]; then

  # Don't lose upstream changes!
  git fetch upstream

  # Rebase onto latest master
  if git rebase upstream/$TARG; then

    # Allow working directly with the main fork
    echo
    echo -n "Pushing to origin/$TARG... "
    git push origin HEAD:$TARG

    echo
    echo -n "Pushing to upstream/$TARG... "
    git push upstream HEAD:$TARG

  else

    echo "Merge conflicts? Stopping here."
    exit

  fi

else

  if [ -z "$(git branch -vv | grep ^\* | grep \\\[origin)" ]; then
    firstpush
  else
    echo
    echo -n "Pushing to origin/$BRANCH... "
    git push -f origin
  fi

  opensite "https://github.com/$ORG/$REPO/compare/$TARG...$FORK:$BRANCH?expand=1"

fi

# Uncomment to compress the final html files
# mv ./_plugins/jekyll-press.rb-disabled ./_plugins/jekyll-press.rb
# bundle install

echo
echo "Generating MarlinDocumentation..."

rm -rf build

# build the site statically and proof it
bundle exec jekyll build --profile --trace --no-watch
bundle exec htmlproofer ./build --only-4xx --allow-hash-href --check-favicon --check-html --url-swap ".*marlinfw.org/:/"

# Sync the built site into a temporary folder
TMPFOLDER=$( mktemp -d )
rsync -av build/ ${TMPFOLDER}/

# Clean out changes and other junk in the branch
git reset --hard
git clean -d -f

# Copy built-site into the gh-pages branch
git checkout gh-pages || { echo "Something went wrong!"; exit 1; }
rsync -av ${TMPFOLDER}/ ./

# Commit and push the new live site directly
git add --all
git commit --message "Built from ${COMMIT}"
git push -f origin
git push -f upstream | {
  while IFS= read -r line
  do
    [[ $line =~ "gh-pages -> gh-pages" ]] && opensite "https://marlinfw.org/"
    echo "$line"
  done
}

# remove the temporary folder
rm -rf ${TMPFOLDER}

# Go back to the branch we started from
git checkout $CURR && [[ $HAS_STASH == 1 ]] && git stash pop
