name: deploy

on:
  push:
    branches:
      - main
  workflow_dispatch:

concurrency:
  group: deploy-main
  cancel-in-progress: false

jobs:
  redeploy:
    runs-on: [self-hosted, linux, arch, homelab, prod]
    steps:
      - name: Redeploy workstation
        shell: bash
        env:
          DEPLOY_HOST: ${{ secrets.DEPLOY_HOST }}
          DEPLOY_PORT: ${{ secrets.DEPLOY_PORT }}
          DEPLOY_USER: ${{ secrets.DEPLOY_USER }}
          DEPLOY_PATH: ${{ secrets.DEPLOY_PATH }}
          DEPLOY_KEY: ${{ secrets.DEPLOY_SSH_KEY }}
          # Set APPLY_PRUNE=true to enable kubectl apply --prune. Requires every
          # manifest to carry label app.kubernetes.io/managed-by=homelab-deploy,
          # otherwise previously applied resources get deleted on the next run.
          APPLY_PRUNE: ${{ vars.APPLY_PRUNE }}
        run: |
          set -euo pipefail

          : "${DEPLOY_HOST:?missing DEPLOY_HOST}"
          : "${DEPLOY_USER:?missing DEPLOY_USER}"
          : "${DEPLOY_KEY:?missing DEPLOY_SSH_KEY}"

          deploy_port="${DEPLOY_PORT:-22}"
          deploy_path="${DEPLOY_PATH:-/srv/homelab}"

          ssh_key="$RUNNER_TEMP/deploy_key"
          mkdir -p "$RUNNER_TEMP"
          printf '%s\n' "$DEPLOY_KEY" > "$ssh_key"
          chmod 600 "$ssh_key"

          ssh_opts=(
            -i "$ssh_key"
            -p "$deploy_port"
            -o BatchMode=yes
            -o StrictHostKeyChecking=accept-new
          )

          ssh "${ssh_opts[@]}" "${DEPLOY_USER}@${DEPLOY_HOST}" \
            "DEPLOY_PATH=$(printf '%q' \"$deploy_path\") APPLY_PRUNE=$(printf '%q' \"${APPLY_PRUNE:-false}\") bash -se" <<'EOF'
          set -euo pipefail

          repo="${DEPLOY_PATH:-/srv/homelab}"

          if [ ! -d "$repo/.git" ]; then
            echo "Repository not found at $repo"
            exit 1
          fi

          git -C "$repo" fetch origin main
          git -C "$repo" reset --hard origin/main

          # Runtime selection: a service is k8s-managed when $SERVICE/k8s/active
          # exists. Otherwise it is compose-managed, and only k8s/routing/*
          # manifests (external Services / EndpointSlices / ServersTransport /
          # Ingresses that route to docker backends) are applied.
          #   migrate:   touch SERVICE/k8s/active   (+ move routing files up)
          #   rollback:  rm SERVICE/k8s/active
          collect_k8s() {
            find "$1" -type f \( -name '*.yaml' -o -name '*.yml' \) \
              ! -path '*/routing/*' ! -path '*/overlays/*' \
              ! -name 'kustomization.y*ml' ! -name '*.example.y*ml' \
              ! -name '*values.y*ml' ! -name 'patch-*.y*ml' \
              | sort
          }

          collect_k8s_inactive() {
            find "$1" -type f \( -name '*.yaml' -o -name '*.yml' \) \
              \( -name 'namespace.y*ml' -o -path '*/routing/*' \) \
              ! -path '*/overlays/*' ! -name '*.example.y*ml' \
              | sort
          }

          mapfile -t compose_stacks < <(
            find "$repo" -type f \( -name 'compose.yaml' -o -name 'compose.yml' \) | sort
          )

          mapfile -t k8s_manifests < <(
            for kd in $(find "$repo" -type d -name k8s ! -path '*/.git/*' | sort); do
              if [ -f "$kd/active" ]; then
                collect_k8s "$kd"
              else
                collect_k8s_inactive "$kd"
              fi
            done
          )

          echo "== Validate compose stacks =="
          for cf in "${compose_stacks[@]}"; do
            dir=$(dirname "$cf")
            if [ -f "$dir/k8s/active" ]; then
              echo "  skip (k8s-managed): $dir"
              continue
            fi
            echo "  config: $cf"
            docker compose -f "$cf" config --quiet
          done

          echo "== Validate k8s manifests (kubectl dry-run) =="
          for m in "${k8s_manifests[@]}"; do
            echo "  apply --dry-run=client $m"
            kubectl apply --dry-run=client -f "$m" >/dev/null
          done

          echo "== Applying Kubernetes manifests =="
          ns_files=()
          other_files=()
          for m in "${k8s_manifests[@]}"; do
            case "$m" in
              */namespace.y?ml) ns_files+=("$m") ;;
              *) other_files+=("$m") ;;
            esac
          done

          prune_opts=()
          if [ "${APPLY_PRUNE:-false}" = "true" ]; then
            prune_opts=(--prune -l app.kubernetes.io/managed-by=homelab-deploy)
          fi

          if [ "${#ns_files[@]}" -gt 0 ]; then
            echo "  namespaces first: ${ns_files[*]}"
            kubectl apply -f "${ns_files[@]}"
          fi
          if [ "${#other_files[@]}" -gt 0 ]; then
            echo "  resources: ${other_files[*]}"
            kubectl apply "${prune_opts[@]}" -f "${other_files[@]}"
          fi

          echo "== Redeploying docker compose stacks =="
          for cf in "${compose_stacks[@]}"; do
            dir=$(dirname "$cf")
            if [ -f "$dir/k8s/active" ]; then
              echo "  skip (k8s-managed): $dir"
              continue
            fi
            echo "  compose: $dir"
            if grep -Eq '^\s+pull_policy:\s*build\b' "$cf"; then
              docker compose -f "$cf" build
              docker compose -f "$cf" push
            fi
            docker compose -f "$cf" up -d --pull always --remove-orphans
          done
          EOF