previews-cf.yml

name: 'Deploy: Cloudflare PR Preview'
on:
  pull_request:
    types: [opened, reopened, synchronize, ready_for_review]
  
env:
  PAGES_PROJECT_NAME: discretize-optimizer
  NODE_VERSION: 18
  
jobs:
  # see https://github.com/orgs/community/discussions/26726, https://stackoverflow.com/a/70249520
  check-secrets:
    runs-on: ubuntu-latest
    outputs:
      exists: ${{ steps.check-secret-step.outputs.exists }}
    steps:
      - name: Check that secrets exist
        id: check-secret-step
        run: |
          if [ "${{ secrets.CF_GLOBAL_APIKEY }}" != '' ]; then
            echo "exists=true" >> $GITHUB_OUTPUT;
          else
            echo "exists=false" >> $GITHUB_OUTPUT;
          fi

  deployment:
    needs: [check-secrets]
    runs-on: ubuntu-latest
    permissions:
      contents: read
      deployments: write
      pull-requests: write 

    if: >
      needs.check-secrets.outputs.exists == 'true' &&
      github.event.pull_request.head.repo.full_name == github.event.pull_request.base.repo.full_name &&
      !contains(github.event.head_commit.message, 'skip ci') &&
      !contains(github.event.pull_request.body, '[no previews]') &&
      (contains(github.event.pull_request.body, '[draft previews]') || github.event.pull_request.draft == false)
    timeout-minutes: 15

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Set up PNPM
        uses: pnpm/action-setup@v4
      - name: Set up Node
        uses: actions/setup-node@v4
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: pnpm
      - name: Install dependencies
        run: pnpm install

      - name: Cache Rust Output
        id: rust-output-cache
        uses: actions/cache@v4
        with:
          path: |
            wasm_module/pkg
            wasm_module/target
          key: rust-output-${{ env.NODE_VERSION }}-${{ hashFiles('wasm_module', '**/pnpm-lock.yaml') }}
          restore-keys: rust-output-
      - name: Cache Rust Dependencies
        uses: Swatinem/rust-cache@v2
        with:
          workspaces: wasm_module
        if: steps.rust-output-cache.outputs.cache-hit != 'true'
      - name: Compile Rust
        run: pnpm wasm
        if: steps.rust-output-cache.outputs.cache-hit != 'true'

      - name: Build Cloudflare
        run: pnpm build-cf

      - name: Deploy preview to Cloudflare
        uses: cloudflare/pages-action@1
        id: pages-action
        with:
          apiToken: ${{ secrets.CI_CF_PAGES }}
          accountId: ${{ secrets.CF_ACCOUNT_ID }}
          projectName: ${{ env.PAGES_PROJECT_NAME }}
          directory: dist
          branch: ${{ github.head_ref || github.ref_name }} 
          gitHubToken: ${{ secrets.GITHUB_TOKEN }}
          wranglerVersion: '3'

      - name: Comment PR
        uses: thollander/actions-comment-pull-request@v2
        with:
          message: |
            Deployed ${{ steps.pages-action.outputs.environment }} build to Cloudflare!

            |                         |   |
            | ----------------------- | - |
            | **Last commit:**        | ${{ github.event.pull_request.head.sha || github.event.workflow_run.head_sha || github.sha }} |
            | **Preview URL**:        | ${{ steps.pages-action.outputs.url }} |
            | **Branch Preview URL**: | https://${{ github.head_ref || github.ref_name }}.${{ env.PAGES_PROJECT_NAME }}.pages.dev |
          comment_tag: deployment
          mode: upsert