name: Deploy (manual)

on:
  workflow_dispatch:
    inputs:
      target:
        description: "Target host (e.g. helsinki-a, london-b, all)"
        required: true
        type: string
      playbook:
        description: "Ansible playbook to run (e.g. site.yml, update.yml)"
        required: true
        type: string
      dry_run:
        description: "Dry run (--check mode)"
        required: false
        type: boolean
        default: true

# Requires these repository secrets:
#   TAILSCALE_CLIENT_ID  — Tailscale OAuth client ID (federated identity)
#   TAILSCALE_AUDIENCE   — Tailscale federated identity audience
#   SSH_PRIVATE_KEY      — SSH key authorized on target hosts
#   AGE_SECRET_KEY       — age private key for SOPS decryption

jobs:
  prepare:
    name: Prepare matrix
    runs-on: ubuntu-latest
    outputs:
      hosts: ${{ steps.prepare.outputs.hosts }}
    steps:
      - uses: actions/checkout@v6

      - name: Build host matrix
        id: prepare
        run: |
          ALL_HOSTS=$(grep 'ansible_host=' ansible/inventory/hosts.ini | awk '{print $1}' | jq -R . | jq -cs .)
          TARGET="${{ inputs.target }}"
          if [ "$TARGET" = "all" ]; then
            echo "hosts=$ALL_HOSTS" >> "$GITHUB_OUTPUT"
          else
            JSON=$(echo "$TARGET" | tr ',' '\n' | tr -d ' ' | grep -v '^$' | jq -R . | jq -cs .)
            echo "hosts=$JSON" >> "$GITHUB_OUTPUT"
          fi

  deploy:
    needs: prepare
    name: Deploy ${{ inputs.playbook }} → ${{ matrix.host }}
    runs-on: ubuntu-latest
    environment: production # requires manual approval in repo settings
    permissions:
      id-token: write
    strategy:
      matrix:
        host: ${{ fromJson(needs.prepare.outputs.hosts) }}
      fail-fast: false
    steps:
      - uses: actions/checkout@v6

      - name: Set up Tailscale
        uses: tailscale/github-action@v4
        with:
          oauth-client-id: ${{ secrets.TAILSCALE_CLIENT_ID }}
          audience: ${{ secrets.TAILSCALE_AUDIENCE }}
          tags: tag:ci

      - name: Set up SSH key
        run: |
          mkdir -p ~/.ssh
          echo "${{ secrets.SSH_PRIVATE_KEY }}" > ~/.ssh/id_ed25519
          chmod 600 ~/.ssh/id_ed25519
          IPS=$(grep 'ansible_host=' ansible/inventory/hosts.ini | awk -F'ansible_host=' '{print $2}' | awk '{print $1}' | tr '\n' ' ')
          ssh-keyscan -H $IPS >> ~/.ssh/known_hosts 2>/dev/null || true

      - name: Install tools
        run: |
          pip install ansible
          wget -qO /tmp/sops.deb https://github.com/getsops/sops/releases/download/v3.9.4/sops_3.9.4_amd64.deb
          sudo dpkg -i /tmp/sops.deb

      - name: Install Ansible collections
        run: ansible-galaxy install -r ansible/requirements.yml

      - name: Decrypt secrets
        env:
          SOPS_AGE_KEY: ${{ secrets.AGE_SECRET_KEY }}
        run: |
          find . -name '*.enc.yml' -o -name '*.enc.yaml' -o -name '*.enc.env' | while read f; do
            out="${f/.enc/}"
            sops -d "$f" > "$out"
          done

      - name: Run playbook
        working-directory: ansible/
        env:
          ANSIBLE_HOST_KEY_CHECKING: "false"
        run: |
          PLAYBOOK="${{ inputs.playbook }}"
          PLAYBOOK="${PLAYBOOK#playbooks/}"
          PLAYBOOK="${PLAYBOOK%.yml}.yml"
          if [ "$PLAYBOOK" != "deploy.yml" ]; then
            PLAYBOOK="playbooks/$PLAYBOOK"
          fi

          ARGS="--limit ${{ matrix.host }}"
          if [ "${{ inputs.dry_run }}" = "true" ]; then
            ARGS="$ARGS --check --diff"
          fi
          ansible-playbook "$PLAYBOOK" $ARGS