---
name: "PR Preview"
on:
  push:
jobs:
  get-pr:
    runs-on: ubuntu-latest
    outputs:
      number: ${{ steps.find-pr.outputs.number }}
    if: ${{ github.actor != 'dependabot[bot]' }}
    steps:
      - uses: jwalton/gh-find-current-pr@master
        id: find-pr
        with:
          state: all
  base-ref:
    runs-on: ubuntu-latest
    needs: get-pr
    outputs:
      base-ref: ${{ steps.base-ref.outputs.base-ref }}
    if: ${{ needs.get-pr.outputs.number != '' }}
    steps:
      - run: sudo apt install -y jq
      - name: Locate Base Ref
        id: base-ref
        run: |
          echo "base-ref=$(gh api /repos/${{ github.repository }}/pulls/${{ needs.get-pr.outputs.number }} | jq -r '.base.ref')" >> "$GITHUB_OUTPUT"
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
  eval-base:
    runs-on: ubuntu-latest
    needs: base-ref
    outputs:
      drv: ${{ steps.drv.outputs.drv }}
    steps:
      - uses: actions/checkout@v6
        with:
          ref: ${{ needs.base-ref.outputs.base-ref }}
      - uses: ./.github/actions/setup-nix
      - id: drv
        run: echo "drv=$(nix eval .#docs --json)" >> "$GITHUB_OUTPUT"
  eval-head:
    runs-on: ubuntu-latest
    needs: get-pr
    outputs:
      drv: ${{ steps.drv.outputs.drv }}
    if: ${{ needs.get-pr.outputs.number != '' }}
    steps:
      - uses: actions/checkout@v6
      - uses: ./.github/actions/setup-nix
      - id: drv
        run: echo "drv=$(nix eval .#docs --json)" >> "$GITHUB_OUTPUT"
  deploy:
    runs-on: ubuntu-latest
    needs:
      - eval-head
      - eval-base
      - get-pr
    environment:
      name: pr-${{ needs.get-pr.outputs.number }}
      url: https://pr-${{ needs.get-pr.outputs.number }}.wire-docs.pages.dev/
    # skip if nothing changed in the docs package
    if: needs.eval-head.outputs.drv != needs.eval-base.outputs.drv
    steps:
      - uses: actions/checkout@v6
      - uses: ./.github/actions/setup-nix
      - run: nix build .#docs
      - name: Deploy to Cloudflare Pages
        id: deployment
        uses: cloudflare/wrangler-action@v3
        with:
          apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
          accountId: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
          command: pages deploy ./result/ --project-name wire-docs --branch pr-${{ needs.get-pr.outputs.number }}