name: Deploy Preview

on:
  pull_request:
    types: [opened, synchronize, reopened]

jobs:
  deploy:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: pnpm/action-setup@v4

      - uses: actions/setup-node@v4
        with:
          node-version: 20
          cache: pnpm

      - run: pnpm install --frozen-lockfile

      - name: Determine changed apps
        id: changes
        run: |
          APPS=$(pnpm turbo build --filter='...[origin/main]' --dry-run=json | jq -r '[.packages[] | select(startswith("@homelab/")) | sub("@homelab/";"") ] | join(",")')
          echo "apps=$APPS" >> "$GITHUB_OUTPUT"

      - name: Build and push images
        if: steps.changes.outputs.apps != ''
        run: |
          echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin
          IFS=',' read -ra APPS <<< "${{ steps.changes.outputs.apps }}"
          for app in "${APPS[@]}"; do
            docker build \
              -t ghcr.io/${{ github.repository_owner }}/homelab-${app}:${{ github.sha }} \
              apps/${app}
            docker push ghcr.io/${{ github.repository_owner }}/homelab-${app}:${{ github.sha }}
          done

      - name: Update image tags in preview overlay
        if: steps.changes.outputs.apps != ''
        run: |
          IFS=',' read -ra APPS <<< "${{ steps.changes.outputs.apps }}"
          for app in "${APPS[@]}"; do
            cd apps/${app}/k8s/overlays/preview
            kustomize edit set image ghcr.io/${{ github.repository_owner }}/homelab-${app}=ghcr.io/${{ github.repository_owner }}/homelab-${app}:${{ github.sha }}
            cd -
          done

      - name: Comment preview URL
        uses: actions/github-script@v7
        with:
          script: |
            github.rest.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: `## Preview Deploy\nNamespace: \`preview-${context.issue.number}\`\nArgoCD will sync automatically from branch \`${context.payload.pull_request.head.ref}\`.`
            })