name: Validate Title and Check for Dist Changes

on:
  # Triggers the workflow on a few types of pull request events but only for the dev branch
  pull_request:
    branches: [dev]
    types: [opened, edited, synchronize, reopened]

  # Allows you to run this workflow manually from the Actions tab
  workflow_dispatch:

jobs:
  checkFiles:
    name: Check Files and Title
    runs-on: ubuntu-latest
    steps:
      - name: Checkout files
        uses: actions/checkout@v3
      - name: Check bundle files
        id: changed-bundle-files
        uses: tj-actions/changed-files@v18.4
        with:
          files: |
            dist/*

      - name: Warn when dist was changed or title is invalid
        id: warn-bundles-changed
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          echo "Creating labels for dist modification and for invalid title"
          LABELDIST="warning: includes dist changes"
          LABELTITLE="error: invalid title"
          gh --repo "${{ github.repository }}" label create "$LABELDIST" --description "Dist changes should not normally be included" --color EBAE34 || true
          gh --repo "${{ github.repository }}" label create "$LABELTITLE" --description "PR title must follow specific format" --color D93F0B || true

          echo "Determine dist portion of comment text, and add/remove dist label as appropriate"
          if [ "${{ steps.changed-bundle-files.outputs.any_changed }}" == "false" ]; then
            echo "No forbidden files included, removing warning"
            gh --repo "${{ github.repository }}" pr edit "${{ github.event.number }}" --remove-label "$LABELDIST" || true
            distText="### No dist changes are detected."
          else
            echo "Forbidden files included, generating warning"
            gh --repo "${{ github.repository }}" pr edit "${{ github.event.number }}" --add-label "$LABELDIST"
            distText="## Dist changes were included. PRs should not normally contain any changes in the dist folder.\n\nReview the changes and ensure that the included dist changes were necessary."
          fi

          echo "Validate title"
          PR_TITLE=$(gh --repo "${{ github.repository }}" pr view "${{ github.event.number }}" --json title --jq .title)
          TITLE_REGEX="^[0-9A-Z\-]*: .*$"
          PR_TITLE_VALID=$(echo "$PR_TITLE" | grep -Eq "$TITLE_REGEX" && echo "true" || echo "false")

          echo "Determine title portion of comment text, and add/remove title label as appropriate"
          if [ "$PR_TITLE_VALID" == "true" ]; then
            gh --repo "${{ github.repository }}" pr edit "${{ github.event.number }}" --remove-label "$LABELTITLE" || true
            commentText="$distText \n\n### Title is valid."
            makeNewComment="${{ steps.changed-bundle-files.outputs.any_changed }}"
          else
            gh --repo "${{ github.repository }}" pr edit "${{ github.event.number }}" --add-label "$LABELTITLE" || true
            commentText="$distText \n\n## The title \`$PR_TITLE\` should match \`$TITLE_REGEX\`\n\nCATEGORY: Change Description\n\nCATEGORY is something like 'API', 'UI', 'MISC', 'STANEK', etc.\n\nChange Description is what you'd tell a non-contributor to convey what is changed."
            makeNewComment="true"
          fi

          echo "Edit existing comment or make a new one (if no comment present and one of the tests failed)"
          if [ "$makeNewComment" == "true" ]; then
            gh --repo "${{ github.repository }}" pr comment "${{ github.event.number }}" --body "$(echo -e $commentText)" --edit-last || gh --repo "${{ github.repository }}" pr comment "${{ github.event.number }}" --body "$(echo -e $commentText)"
            exit 1
          else
            gh --repo "${{ github.repository }}" pr comment "${{ github.event.number }}" --body "$(echo -e $commentText)" --edit-last || true
          fi