name: Destroy

on:
  workflow_dispatch:
    inputs:
      confirm:
        description: 'Type "destroy" to confirm'
        required: true
        default: ''

concurrency:
  group: prod-cluster
  cancel-in-progress: false

env:
  TF_VERSION: "1.7.0"
  TF_VAR_s3_access_key: ${{ secrets.S3_ACCESS_KEY }}
  TF_VAR_s3_secret_key: ${{ secrets.S3_SECRET_KEY }}
  TF_VAR_s3_endpoint: ${{ secrets.S3_ENDPOINT }}
  TF_VAR_s3_bucket: ${{ secrets.S3_BUCKET }}
  TF_VAR_tailscale_tailnet: ${{ secrets.TAILSCALE_TAILNET }}
  TF_VAR_proxmox_endpoint: ${{ secrets.PROXMOX_ENDPOINT }}
  TF_VAR_proxmox_api_token_id: ${{ secrets.PROXMOX_API_TOKEN_ID }}
  TF_VAR_proxmox_api_token_secret: ${{ secrets.PROXMOX_API_TOKEN_SECRET }}
  TF_VAR_proxmox_insecure: "true"

jobs:
  destroy:
    name: Destroy Cluster
    runs-on: ubuntu-22.04
    if: github.event.inputs.confirm == 'destroy'
    environment: destroy
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Setup Terraform
        uses: hashicorp/setup-terraform@v3
        with:
          terraform_version: ${{ env.TF_VERSION }}

      - name: Setup SSH Keys
        run: |
          mkdir -p ~/.ssh
          echo "${{ secrets.SSH_PRIVATE_KEY }}" > ~/.ssh/id_ed25519
          chmod 600 ~/.ssh/id_ed25519
          echo "${{ secrets.SSH_PUBLIC_KEY }}" > ~/.ssh/id_ed25519.pub
          chmod 644 ~/.ssh/id_ed25519.pub

      - name: Terraform Init
        working-directory: terraform
        run: |
          terraform init \
            -lockfile=readonly \
            -backend-config="endpoint=${{ secrets.S3_ENDPOINT }}" \
            -backend-config="bucket=${{ secrets.S3_BUCKET }}" \
            -backend-config="region=auto" \
            -backend-config="access_key=${{ secrets.S3_ACCESS_KEY }}" \
            -backend-config="secret_key=${{ secrets.S3_SECRET_KEY }}" \
            -backend-config="skip_requesting_account_id=true"

      - name: Save Proxmox target list
        run: |
          mkdir -p outputs
          if ! terraform -chdir=terraform output -json proxmox_target_vms > outputs/proxmox_target_vms.json; then
            terraform -chdir=terraform plan \
              -refresh=false \
              -var="ssh_public_key=$HOME/.ssh/id_ed25519.pub" \
              -var="ssh_private_key=$HOME/.ssh/id_ed25519" \
              -out=cleanup.tfplan \
              -no-color || true
            printf '[]' > outputs/proxmox_target_vms.json
          fi

      - name: Terraform Destroy
        id: destroy
        working-directory: terraform
        run: |
          set +e
          for attempt in 1 2 3; do
            echo "Terraform destroy attempt ${attempt}/3"
            terraform destroy \
              -parallelism=2 \
              -var="ssh_public_key=$HOME/.ssh/id_ed25519.pub" \
              -var="ssh_private_key=$HOME/.ssh/id_ed25519" \
              -auto-approve
            rc=$?
            if [ "$rc" -eq 0 ]; then
              exit 0
            fi
            if [ "$attempt" -lt 3 ]; then
              echo "Terraform destroy failed with exit code ${rc}; retrying in 30s"
              sleep 30
              terraform refresh \
                -var="ssh_public_key=$HOME/.ssh/id_ed25519.pub" \
                -var="ssh_private_key=$HOME/.ssh/id_ed25519" || true
            fi
          done
          exit "$rc"

      - name: Verify Proxmox target VMs removed
        if: success()
        run: |
          python3 scripts/proxmox-rebuild-cleanup.py --mode post-destroy --targets-file outputs/proxmox_target_vms.json
          if [ -f terraform/cleanup.tfplan ]; then
            python3 scripts/proxmox-rebuild-cleanup.py --mode post-destroy --terraform-dir terraform --plan cleanup.tfplan
          fi

      - name: Terraform state diagnostics
        if: failure() && steps.destroy.outcome == 'failure'
        run: |
          terraform -chdir=terraform state list || true