name: PR Validation
on:
  pull_request:
    types: [opened, edited, synchronize, labeled, unlabeled, milestoned, demilestoned]

permissions:
  contents: read

jobs:
  validate:
    name: Validate PR
    runs-on: ubuntu-latest
    steps:
      - name: Validate Description
        uses: actions/github-script@v6
        with:
          script: |
            const body = context.payload.pull_request.body;
            const requiredRegex = new RegExp('^RELEASE NOTES:\\s*([Nn][Oo][Nn][Ee]|[Nn]/[Aa]|\\n(\\*|-)\\s*.+)$', 'm');
            if (!requiredRegex.test(body)) {
              core.setFailed(`
                The PR description must include a RELEASE NOTES section.
                It should be in one of the following formats:
                - "RELEASE NOTES: none" (case-insensitive)
                - "RELEASE NOTES: N/A" (case-insensitive)
                - A bulleted list under "RELEASE NOTES:", for example:
                  RELEASE NOTES:
                  * my_package: Fix bug causing crash...
              `);
            }

      - name: Validate Label
        uses: actions/github-script@v6
        with:
          script: |
            const labels = context.payload.pull_request.labels.map(label => label.name);
            const requiredRegex = new RegExp('^Type:');
            const hasRequiredLabel = labels.some(label => requiredRegex.test(label));
            if (!hasRequiredLabel) {
              core.setFailed("This PR must have a label starting with 'Type:'.");
            }

      - name: Validate Milestone
        uses: actions/github-script@v6
        with:
          script: |
            const milestone = context.payload.pull_request.milestone;
            if (!milestone) {
              core.setFailed("This PR must be associated with a milestone.");
            } else {
              const requiredRegex = new RegExp('Release$');
              if (!requiredRegex.test(milestone.title)) {
                core.setFailed("The milestone for this PR must end with 'Release'.");
              }
            }