# Copyright 2026 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

name: "CF: Deploy Docs Preview"

# zizmor flags workflow_run input, but this workflow safely sanitizes the untrusted PR number artifact before use.
on: # zizmor: ignore[dangerous-triggers]
  workflow_run:
    workflows: ["CF: Build Docs Preview"]
    types:
      - completed
  workflow_dispatch:
    inputs:
      pr_number:
        description: 'PR Number to deploy (Manual override)'
        required: true
        type: string
      build_run_id:
        description: 'The Run ID from the successful "CF: Build Docs Preview" workflow'
        required: true
        type: string

permissions:
  contents: read
  pull-requests: write

jobs:
  deploy-preview:
    if: >
      github.event_name == 'workflow_dispatch' ||
      (github.event.workflow_run.event == 'pull_request' && github.event.workflow_run.conclusion == 'success')
    runs-on: ubuntu-24.04
    concurrency:
      group: "cf-deploy-${{ github.event.inputs.pr_number || github.event.workflow_run.pull_requests[0].number }}"
      cancel-in-progress: true
    steps:
      - name: Checkout base repository
        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
        with:
          persist-credentials: false

      - name: Download Artifact
        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
        with:
          name: cf-preview-data
          github-token: ${{ secrets.GITHUB_TOKEN }}
          run-id: ${{ github.event.inputs.build_run_id || github.event.workflow_run.id }}
          path: downloaded-artifact

      - name: Read PR Number
        id: get_pr
        run: |
          if [ -n "${GITHUB_EVENT_INPUTS_PR_NUMBER}" ]; then
            PR_NUMBER="${GITHUB_EVENT_INPUTS_PR_NUMBER}"
          else
            PR_NUMBER=$(cat downloaded-artifact/pr_number.txt)
          fi
          if ! [[ "$PR_NUMBER" =~ ^[0-9]+$ ]]; then
            echo "Error: PR number [$PR_NUMBER] is invalid."
            exit 1
          fi
          echo "pr_number=$PR_NUMBER" >> "$GITHUB_OUTPUT"
        env:
          GITHUB_EVENT_INPUTS_PR_NUMBER: ${{ github.event.inputs.pr_number }}

      - name: Deploy to Cloudflare Pages
        id: cf_deploy
        uses: cloudflare/wrangler-action@ebbaa1584979971c8614a24965b4405ff95890e0 # v4
        with:
          apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
          accountId: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
          command: pages deploy downloaded-artifact/public --project-name toolbox-docs --branch pr-${{ steps.get_pr.outputs.pr_number }}

      - name: Post Preview URL Comment
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9
        env:
          PR_NUMBER: ${{ steps.get_pr.outputs.pr_number }}
          DEPLOY_URL: ${{ steps.cf_deploy.outputs.pages-deployment-alias-url }}
        with:
          script: |
            const prNumber = parseInt(process.env.PR_NUMBER, 10);
            const deployUrl = process.env.DEPLOY_URL;
            const marker = '<!-- cf-preview-comment-marker -->';

            // Fetch all comments on the PR
            const { data: comments } = await github.rest.issues.listComments({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: prNumber,
            });

            // Look for the invisible HTML marker
            const existingComment = comments.find(c => c.body.includes(marker));

            // Exit early if we've already posted a comment for this PR to avoid duplicates
            if (existingComment) {
              console.log("Preview link already posted on this PR. Skipping.");
              return;
            }

            // Create the comment since it's the first deployment for this PR
            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: prNumber,
              body: `${marker}\n🚀 **Cloudflare Preview Ready!**\n\n🔎 View Preview: ${deployUrl}\n\n*(Note: Subsequent pushes to this PR will automatically update the preview at this same URL)*`
            });