name: Update Environment

on:
  pull_request:
    types: [synchronize]

jobs:
  # This job get a deployment for the current branch, it assumes that at most a
  # deployment exists for any given branch, since it's a proof of concept
  # Also it assumes a previous create command like `.deploy | --vars.foo=bar --vars.bar=baz`
  payload:
    name: Retrieve payload
    runs-on: ubuntu-latest
    steps:
      - name: Get payload
        id: payload
        run: |
          gh api repos/${{ github.repository }}/deployments?ref=${{ github.event.pull_request.head.ref }}) \
           | jq -c 'first | .payload.parsed_params.vars' > payload.json
          echo vars=$(cat payload.json) >> "$GITHUB_OUTPUT"
    outputs:
      variables: ${{ steps.payload.outputs.vars }} # will contain {"foo":"bar","bar":"baz"}

  deploy:
    name: Terraform deploy
    needs: payload
    runs-on: ubuntu-latest
    steps:
      - name: Store params
        # Assuming that the payload is a JSON object with a key `params_parsed`
        run: |
          echo '${{ fromJSON(needs.payload.outputs.variables) }}' > params.tfvars.json
      - name: Setup Terraform
        uses: hashicorp/setup-terraform@v3
      - uses: actions/checkout@v4
      - name: Terraform init
        run: terraform init
      - name: Terraform apply
        run: terraform apply -auto-approve -var-file=params.tfvars.json