name: Add PR Guidelines Comment

on:
  pull_request_target:
    types: [opened, labeled]

jobs:
  add-comment:
    runs-on: ubuntu-latest
    steps:
      - name: Check out the repository
        uses: actions/checkout@v2

      - name: Set environment variable for early exit control
        id: check_label
        run: |
          echo "CONTINUE_JOB=true" >> $GITHUB_ENV
          if [[ "${{ github.event.action }}" == "labeled" || "${{ github.event.action }}" == "opened" ]]; then
            RELEVANT_LABELS=("bug" "enhancement" "schema" "Rule: New" "Rule: Tuning" "Rule: Deprecation" "Hunt: New" "Hunt: Tuning")
            TRIGGERED_LABEL="${{ github.event.label.name }}"
            if [[ ! " ${RELEVANT_LABELS[@]} " =~ " ${TRIGGERED_LABEL} " ]]; then
              echo "CONTINUE_JOB=false" >> $GITHUB_ENV
            fi
          fi

      - name: Determine Guidelines Label
        run: |
          # Initialize GUIDELINES_FILE to empty
          echo "GUIDELINES_FILE=" >> $GITHUB_ENV
          if [[ "${{ contains(github.event.pull_request.labels.*.name, 'bug') }}" == "true" ]]; then
            echo "GUIDELINES_FILE=.github/PULL_REQUEST_GUIDELINES/bug_guidelines.md" >> $GITHUB_ENV
          elif [[ "${{ contains(github.event.pull_request.labels.*.name, 'enhancement') }}" == "true" ]]; then
            echo "GUIDELINES_FILE=.github/PULL_REQUEST_GUIDELINES/enhancement_guidelines.md" >> $GITHUB_ENV
          elif [[ "${{ contains(github.event.pull_request.labels.*.name, 'schema') }}" == "true" ]]; then
            echo "GUIDELINES_FILE=.github/PULL_REQUEST_GUIDELINES/schema_enhancement_guidelines.md" >> $GITHUB_ENV
          elif [[ "${{ contains(github.event.pull_request.labels.*.name, 'Rule: New') }}" == "true" ]]; then
            echo "GUIDELINES_FILE=.github/PULL_REQUEST_GUIDELINES/rule_new_guidelines.md" >> $GITHUB_ENV
          elif [[ "${{ contains(github.event.pull_request.labels.*.name, 'Rule: Tuning') }}" == "true" ]]; then
            echo "GUIDELINES_FILE=.github/PULL_REQUEST_GUIDELINES/rule_tuning_guidelines.md" >> $GITHUB_ENV
          elif [[ "${{ contains(github.event.pull_request.labels.*.name, 'Rule: Deprecation') }}" == "true" ]]; then
            echo "GUIDELINES_FILE=.github/PULL_REQUEST_GUIDELINES/rule_deprecation_guidelines.md" >> $GITHUB_ENV
          elif [[ "${{ contains(github.event.pull_request.labels.*.name, 'Hunt: New') }}" == "true" ]]; then
            echo "GUIDELINES_FILE=.github/PULL_REQUEST_GUIDELINES/hunt_new_guidelines.md" >> $GITHUB_ENV
          elif [[ "${{ contains(github.event.pull_request.labels.*.name, 'Hunt: Tuning') }}" == "true" ]]; then
            echo "GUIDELINES_FILE=.github/PULL_REQUEST_GUIDELINES/hunt_tuning_guidelines.md" >> $GITHUB_ENV
          fi

      - name: Fail if no relevant labels are found
        if: env.GUIDELINES_FILE == ''
        uses: actions/github-script@v7
        with:
          script: |
            core.setFailed('No appropriate GitHub label found in the PR. Failing the job.')

      - name: Add Guidelines Comment
        if: env.CONTINUE_JOB == 'true' && (github.event.action == 'opened' || github.event.action == 'labeled')
        uses: mshick/add-pr-comment@v2
        with:
          message-path: ${{ env.GUIDELINES_FILE }}
          repo-token: ${{ secrets.PROTECTIONS_MACHINE_TOKEN }}
          message-id: "guidelines-comment"