name: Cloudflare Pages PR Preview — Cleanup
description: >-
  Deletes all Cloudflare Pages deployments for a PR's branch alias and updates
  the sticky PR comment to indicate the preview has been cleaned up. Intended
  to run on pull_request.closed.

inputs:
  project-name:
    description: Cloudflare Pages project name
    required: true
  api-token:
    description: Cloudflare API token with Pages:Edit permission on the project
    required: true
  account-id:
    description: Cloudflare account ID
    required: true
  branch:
    description: Cloudflare Pages branch alias whose deployments should be deleted
    required: false
    default: pr-${{ github.event.pull_request.number }}
  comment-marker:
    description: HTML comment marker used to locate the sticky PR comment
    required: false
    default: '<!-- cf-pages-preview -->'
  github-token:
    description: GitHub token for updating the PR comment
    required: false
    default: ${{ github.token }}

runs:
  using: composite
  steps:
    - name: Delete preview deployments
      shell: bash
      env:
        CF_API_TOKEN: ${{ inputs.api-token }}
        CF_ACCOUNT_ID: ${{ inputs.account-id }}
        CF_PROJECT: ${{ inputs.project-name }}
        PR_BRANCH: ${{ inputs.branch }}
      run: |
        set -euo pipefail
        api="https://api.cloudflare.com/client/v4/accounts/${CF_ACCOUNT_ID}/pages/projects/${CF_PROJECT}/deployments"

        echo "Listing deployments for branch alias: ${PR_BRANCH}"
        # Cloudflare paginates at 25/page. One PR rarely has >25 deploys, but
        # loop until the branch alias returns empty just in case of a long-
        # running PR with many pushes.
        while :; do
          ids=$(curl -sS -H "Authorization: Bearer ${CF_API_TOKEN}" "${api}?per_page=25" \
            | jq -r --arg b "$PR_BRANCH" '.result[] | select(.deployment_trigger.metadata.branch == $b) | .id')

          if [ -z "$ids" ]; then
            echo "No deployments remaining for ${PR_BRANCH}."
            break
          fi

          for id in $ids; do
            echo "Deleting deployment ${id}"
            curl -sS -X DELETE -H "Authorization: Bearer ${CF_API_TOKEN}" "${api}/${id}?force=true" \
              | jq -r '"  → success=\(.success) errors=\(.errors // [])"'
          done
        done

    - name: Update PR comment
      uses: actions/github-script@v8
      env:
        COMMENT_MARKER: ${{ inputs.comment-marker }}
      with:
        github-token: ${{ inputs.github-token }}
        script: |
          const { owner, repo } = context.repo;
          const prNumber = context.payload.pull_request.number;
          const marker = process.env.COMMENT_MARKER;

          const { data: comments } = await github.rest.issues.listComments({
            owner, repo, issue_number: prNumber
          });
          const existing = comments.find(c =>
            c.user.type === 'Bot' && c.body.includes(marker)
          );

          if (existing) {
            await github.rest.issues.updateComment({
              owner, repo, comment_id: existing.id,
              body: `${marker}\n## Preview\n\n_Preview deployments for this PR have been cleaned up._`
            });
          }