name: Preview Environment

# Dual triggers — mirrors the claude-code-review.yml pattern exactly:
#   pull_request: same-repo PRs (secrets available, safe to run on PR head)
#   pull_request_target: fork PRs (secrets available via base repo, gated by allowlist)
# Exactly one job runs per PR event based on event_name AND head repo identity.
on:
  pull_request:
    types: [opened, synchronize, reopened, closed]
  pull_request_target:
    types: [opened, synchronize, reopened, closed]

jobs:
  # -----------------------------------------------------------------------
  # Deploy / update preview (same-repo PRs)
  # Always runs for same-repo pushes that are not a close event.
  # -----------------------------------------------------------------------
  deploy-same-repo:
    if: >
      github.event.action != 'closed' &&
      github.event_name == 'pull_request' &&
      github.event.pull_request.head.repo.full_name == github.repository
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: write

    steps:
      - uses: actions/checkout@v4
        with:
          ref: ${{ github.event.pull_request.head.sha }}

      - uses: actions/setup-go@v6
        with:
          go-version-file: apps/backend/go.mod
          cache-dependency-path: apps/backend/go.sum

      - uses: pnpm/action-setup@v4
        with:
          version: "9"

      - uses: actions/setup-node@v6
        with:
          node-version: "24"

      - name: Install frontend dependencies
        run: pnpm -C apps install --frozen-lockfile

      - name: Deploy preview environment
        working-directory: apps/backend
        run: go run ./cmd/preview deploy --pr "$PR" --sha "$SHA" --repo "$REPO" --skip-web-install
        env:
          PR: ${{ github.event.pull_request.number }}
          SHA: ${{ github.event.pull_request.head.sha }}
          REPO: ${{ github.repository }}
          SPRITES_API_TOKEN: ${{ secrets.SPRITES_API_TOKEN }}
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

  # -----------------------------------------------------------------------
  # Deploy / update preview (fork PRs, gated by allowlist)
  # Uses pull_request_target so secrets are available.
  # Gated by: OWNER/MEMBER/COLLABORATOR author_association,
  #           `safe-to-test` label (maintainer opt-in), or
  #           PREVIEW_ENV_ALLOWLIST repo variable (JSON array of logins).
  # -----------------------------------------------------------------------
  deploy-fork:
    if: >
      github.event.action != 'closed' &&
      github.event_name == 'pull_request_target' &&
      github.event.pull_request.head.repo.full_name != github.repository &&
      (contains(fromJSON('["OWNER","MEMBER","COLLABORATOR"]'), github.event.pull_request.author_association) ||
       contains(github.event.pull_request.labels.*.name, 'safe-to-test') ||
       (vars.PREVIEW_ENV_ALLOWLIST != '' && contains(fromJSON(vars.PREVIEW_ENV_ALLOWLIST), github.event.pull_request.user.login)))
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: write

    steps:
      - uses: actions/checkout@v4
        with:
          # pull_request_target checks out base by default; explicitly use PR head.
          # Safe: the preview CLI only reads files to build artifacts and posts comments.
          # NOTE: The allowlist gate (OWNER/MEMBER/COLLABORATOR, safe-to-test, PREVIEW_ENV_ALLOWLIST)
          # authorizes running the fork's cmd/preview code with SPRITES_API_TOKEN and GH_TOKEN.
          # The safe-to-test label must be re-applied after each new push (see strip-safe-to-test job).
          repository: ${{ github.event.pull_request.head.repo.full_name }}
          ref: ${{ github.event.pull_request.head.sha }}

      - uses: actions/setup-go@v6
        with:
          go-version-file: apps/backend/go.mod
          cache-dependency-path: apps/backend/go.sum

      - uses: pnpm/action-setup@v4
        with:
          version: "9"

      - uses: actions/setup-node@v6
        with:
          node-version: "24"

      - name: Install frontend dependencies
        run: pnpm -C apps install --frozen-lockfile

      - name: Deploy preview environment
        working-directory: apps/backend
        run: go run ./cmd/preview deploy --pr "$PR" --sha "$SHA" --repo "$REPO" --skip-web-install
        env:
          PR: ${{ github.event.pull_request.number }}
          SHA: ${{ github.event.pull_request.head.sha }}
          REPO: ${{ github.repository }}
          SPRITES_API_TOKEN: ${{ secrets.SPRITES_API_TOKEN }}
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

  # -----------------------------------------------------------------------
  # Strip safe-to-test label on new pushes to fork PRs.
  # Prevents a once-approved fork from running updated (potentially malicious)
  # code on subsequent pushes without a fresh maintainer re-approval.
  # -----------------------------------------------------------------------
  strip-safe-to-test:
    if: >
      github.event_name == 'pull_request_target' &&
      github.event.action == 'synchronize' &&
      github.event.pull_request.head.repo.full_name != github.repository &&
      contains(github.event.pull_request.labels.*.name, 'safe-to-test')
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
    steps:
      - uses: actions/github-script@v7
        with:
          script: |
            await github.rest.issues.removeLabel({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.payload.pull_request.number,
              name: 'safe-to-test',
            });

  # -----------------------------------------------------------------------
  # Cleanup (all closed PRs — no allowlist check)
  # The sprite must be destroyed regardless of how the PR was closed or
  # whether a preview was ever successfully deployed. Handles gracefully
  # if the sprite does not exist (was never deployed or already destroyed).
  # Runs only on pull_request_target to avoid duplicate runs — both events
  # fire `closed`, but only pull_request_target has secrets for all PRs.
  # -----------------------------------------------------------------------
  cleanup-preview:
    if: >
      github.event.action == 'closed' &&
      github.event_name == 'pull_request_target'
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: write

    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-go@v6
        with:
          go-version-file: apps/backend/go.mod
          cache-dependency-path: apps/backend/go.sum

      - name: Destroy preview environment
        working-directory: apps/backend
        run: go run ./cmd/preview cleanup --pr "$PR" --repo "$REPO"
        env:
          PR: ${{ github.event.pull_request.number }}
          REPO: ${{ github.repository }}
          SPRITES_API_TOKEN: ${{ secrets.SPRITES_API_TOKEN }}
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}