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# This workflow modifies the GCP User Roles when the infra/users.yml file is updated.
# It applies the changes using Terraform to manage the IAM roles for users defined in the users.yml
# If the workflow is triggered by a pull request, it will post the Terraform plan as a comment on the PR
# as a code block for easy review.

name: Modify the GCP User Roles according to the infra/users.yml file

on:
  workflow_dispatch:
  pull_request_target:
    types: [opened, synchronize, reopened, closed]
    paths:
      - 'infra/iam/users.yml'

# This allows a subsequently queued workflow run to interrupt previous runs
concurrency:
  group: '${{ github.workflow }} @ ${{ github.event.issue.number || github.sha || github.head_ref || github.ref }}-${{ github.event.schedule || github.event.comment.id || github.event.sender.login }}'
  cancel-in-progress: true

permissions:
  contents: read
  pull-requests: write

jobs:
  beam_UserRoles:
    name: Apply user roles changes
    runs-on: [self-hosted, ubuntu-20.04, main]
    timeout-minutes: 30
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          ref: ${{ github.event.pull_request.merged == true && github.base_ref || github.event.pull_request.head.sha }}
      - name: Setup gcloud
        uses: google-github-actions/setup-gcloud@v3
      - name: Install Terraform
        uses: hashicorp/setup-terraform@v3
        with:
          terraform_version: 1.12.2
      - name: Initialize Terraform
        working-directory: ./infra/iam
        run: terraform init
      - name: Terraform Plan
        working-directory: ./infra/iam
        run: terraform plan -out=tfplan

      - name: Convert plan to plaintext
        if: github.event.action == 'opened' || github.event.action == 'synchronize' || github.event.action == 'reopened'
        working-directory: ./infra/iam
        run: terraform show -no-color tfplan > tfplan.txt

      - name: Create comment body
        if: github.event.action == 'opened' || github.event.action == 'synchronize' || github.event.action == 'reopened'
        run: |
          PLAN_SIZE=$(wc -c < ./infra/iam/tfplan.txt)
          if [ "$PLAN_SIZE" -gt 60000 ]; then
            echo "### Terraform Plan for User Roles Changes" > comment_body.txt
            echo "Plan is too big, review in Github Action Logs" >> comment_body.txt
          else
            echo "### Terraform Plan for User Roles Changes" > comment_body.txt
            echo '```' >> comment_body.txt
            cat ./infra/iam/tfplan.txt >> comment_body.txt
            echo '```' >> comment_body.txt
          fi

      - name: Upload plan as a comment to PR
        if: github.event.action == 'opened' || github.event.action == 'synchronize' || github.event.action == 'reopened'
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          GH_REPO: ${{ github.repository }}
        run: gh pr comment ${{ github.event.pull_request.number }} --body-file comment_body.txt

      - name: Terraform Apply
        if: github.event.pull_request.merged == true
        working-directory: ./infra/iam
        run: terraform apply -auto-approve tfplan