#!/bin/bash -e

REPOSITORY="$1"
REF="$2"
CONDITIONS_FILE=".github/actions/conditional/conditions"

if [[ "$REF" =~ refs/pull/([0-9]+)/merge ]]; then
  PR=$(echo $REF | cut -f 3 -d '/')
  IS_PR=true
else
  IS_PR=false
fi

if [ "$IS_PR" == true ]; then
  echo "========================================================================================"
  echo "Changes in PR: $PR"
  echo "----------------------------------------------------------------------------------------"

  CHANGED_FILES=$(gh api -X GET --paginate repos/$REPOSITORY/pulls/$PR/files --jq .[].filename)
  echo "$CHANGED_FILES"
fi

echo "========================================================================================"
if [ "$IS_PR" == true ]; then
  echo "Matching regex"
  echo "----------------------------------------------------------------------------------------"
else
  echo "Not a pull request, marking everything as changed"
fi

declare -A JOB_CONDITIONS

readarray -t CONDITIONS <<< "$(cat "$CONDITIONS_FILE" | grep -v '^[ ]*#' | grep -v '^[ ]*$')"

for C in "${CONDITIONS[@]}"; do
  read -r -a CONDITION <<< "$C"

  if [ "$IS_PR" == true ]; then
    PATTERN="${CONDITION[0]}"

    # Convert pattern to regex
    REGEX="$PATTERN"

    # Escape '.' to make it match the '.' character only
    REGEX=$(echo "$REGEX" | sed 's|\.|\\.|g')

    # Convert '*' to match anything
    REGEX=$(echo "$REGEX" | sed 's|\*|.*|g')

    # If ends with directory seperator, allow anything within
    REGEX=$(echo "$REGEX" | sed 's|/$|/.*|g')

    # If no directory separators allow any directory structure before
    if ( echo "$REGEX" | grep -v -E '/' &>/dev/null ); then
      REGEX="(.*/)?$REGEX"
    fi

    # Check if changed files matches regex
    if ( echo "$CHANGED_FILES" | grep -q -E "^$REGEX$"); then
      RUN_JOB=true
      echo "*  $REGEX"
    else
      RUN_JOB=false
      echo "   $REGEX"
    fi
  else
    # Always run job if not a PR
    RUN_JOB=true
  fi

  # Set what jobs should run for the regex
  for ((i = 1; i < ${#CONDITION[@]}; i++)); do
    JOB=${CONDITION[$i]}

    # If already set to run, ignore
    if [ "${JOB_CONDITIONS[$JOB]}" != true ]; then
      JOB_CONDITIONS[$JOB]=$RUN_JOB
    fi
  done
done

echo "========================================================================================"
echo "Run workflows/jobs"
echo "----------------------------------------------------------------------------------------"

# List all jobs and if they should run or not
for JOB in "${!JOB_CONDITIONS[@]}"
do
  echo "$JOB=${JOB_CONDITIONS[$JOB]}"

  # Set output for GitHub job
  if [ "$GITHUB_OUTPUT" != "" ]; then
    echo "$JOB=${JOB_CONDITIONS[$JOB]}" >> $GITHUB_OUTPUT
  fi
done