name: Preview push

on:
  pull_request_target:
    types:
    - synchronize

jobs:
  check_new_preview:
    name: Check preview needs update

    runs-on: ubuntu-20.04

    steps:
    - name: Check if earlier preview exists
      id: earlier_preview
      uses: octokit/request-action@v2.x
      with:
        route: GET /repos/{owner}/{repo}/deployments
        owner: ${{ github.event.repository.owner.login }}
        repo: ${{ github.event.repository.name }}
        environment: preview-pr-${{ github.event.number }}
        per_page: 1
      env:
        GITHUB_TOKEN: ${{ secrets.PREVIEW_GITHUB_TOKEN }}

    - if: toJson(fromJson(steps.earlier_preview.outputs.data)) != '[]'
      name: Check for preview label
      id: preview_label
      uses: octokit/request-action@v2.x
      with:
        route: GET /repos/{owner}/{repo}/issues/{issue_number}/labels
        owner: ${{ github.event.repository.owner.login }}
        repo: ${{ github.event.repository.name }}
        issue_number: ${{ github.event.number }}
      env:
        GITHUB_TOKEN: ${{ secrets.PREVIEW_GITHUB_TOKEN }}

    - if: toJson(fromJson(steps.earlier_preview.outputs.data)) != '[]' && contains(fromJson(steps.preview_label.outputs.data).*.name, 'preview')
      name: Create deployment
      id: deployment
      uses: octokit/request-action@v2.x
      with:
        route: POST /repos/{owner}/{repo}/deployments
        mediaType: |
          previews:
          - ant-man
          - flash
        owner: ${{ github.event.repository.owner.login }}
        repo: ${{ github.event.repository.name }}
        ref: ${{ github.event.pull_request.head.sha }}
        task: deploy:preview
        auto_merge: false
        required_contexts: "[]"
        environment: preview-pr-${{ github.event.number }}
        description: "Preview for Pull Request #${{ github.event.number }}"
      env:
        GITHUB_TOKEN: ${{ secrets.PREVIEW_GITHUB_TOKEN }}

    - if: toJson(fromJson(steps.earlier_preview.outputs.data)) != '[]' && contains(fromJson(steps.preview_label.outputs.data).*.name, 'preview')
      name: Trigger 'preview build'
      uses: peter-evans/repository-dispatch@v1
      with:
        token: ${{ secrets.PREVIEW_GITHUB_TOKEN }}
        event-type: "Preview build #${{ github.event.number }}"
        client-payload: '{"folder": "pr${{ github.event.number }}", "sha": "${{ github.event.pull_request.head.sha }}", "deployment_id": "${{ fromJson(steps.deployment.outputs.data).id }}"}'