name: Deploy Demo Server

on:
  workflow_dispatch:
    inputs:
      target:
        description: 'Demo target to deploy'
        required: true
        default: stable
        type: choice
        options:
          - stable
          - preview-v6
  # schedule:
  #   - cron: '0 0 * * *' # Nightly at midnight

permissions:
  contents: read

jobs:
  resolve:
    runs-on: ubuntu-24.04
    outputs:
      target: ${{ steps.target.outputs.target }}
      environment_name: ${{ steps.target.outputs.environment_name }}

    steps:
      - name: Resolve demo target environment
        id: target
        run: |
          set -euo pipefail
          TARGET="${{ inputs.target }}"
          case "$TARGET" in
            stable)
              ENVIRONMENT_NAME="demo-stable"
              ;;
            preview-v6)
              ENVIRONMENT_NAME="demo-preview-v6"
              ;;
            *)
              echo "::error::Unsupported demo target: ${TARGET}"
              exit 1
              ;;
          esac

          echo "target=$TARGET" >> "$GITHUB_OUTPUT"
          echo "environment_name=$ENVIRONMENT_NAME" >> "$GITHUB_OUTPUT"

  deploy:
    needs: resolve
    runs-on: ubuntu-24.04
    environment: ${{ needs.resolve.outputs.environment_name }}
    env:
      DEMO_EXPECTED_HOSTNAME: ${{ vars.DEMO_EXPECTED_HOSTNAME }}
      DEMO_LOCAL_BASE_URL: ${{ vars.DEMO_LOCAL_BASE_URL }}
      DEMO_SERVICE_NAME: ${{ vars.DEMO_SERVICE_NAME }}
      DEMO_INSTALL_DIR: ${{ vars.DEMO_INSTALL_DIR }}
      DEMO_PUBLIC_HEALTH_URL: ${{ vars.DEMO_PUBLIC_HEALTH_URL }}
      DEMO_TEST_PORT: ${{ vars.DEMO_TEST_PORT }}
      DEMO_AUTH_USER: ${{ vars.DEMO_AUTH_USER }}
      DEMO_AUTH_PASS: ${{ vars.DEMO_AUTH_PASS }}

    steps:
      - name: Validate demo environment configuration
        env:
          DEMO_SERVER_HOST: ${{ secrets.DEMO_SERVER_HOST }}
          DEMO_SERVER_USER: ${{ secrets.DEMO_SERVER_USER }}
          DEMO_SERVER_SSH_KEY: ${{ secrets.DEMO_SERVER_SSH_KEY }}
        run: |
          set -euo pipefail
          [ -n "$DEMO_SERVER_HOST" ] || { echo "::error::DEMO_SERVER_HOST is required in the selected demo environment."; exit 1; }
          [ -n "$DEMO_SERVER_USER" ] || { echo "::error::DEMO_SERVER_USER is required in the selected demo environment."; exit 1; }
          [ -n "$DEMO_SERVER_SSH_KEY" ] || { echo "::error::DEMO_SERVER_SSH_KEY is required in the selected demo environment."; exit 1; }
          [ -n "$DEMO_EXPECTED_HOSTNAME" ] || { echo "::error::DEMO_EXPECTED_HOSTNAME is required in the selected demo environment."; exit 1; }
          [ -n "$DEMO_LOCAL_BASE_URL" ] || { echo "::error::DEMO_LOCAL_BASE_URL is required in the selected demo environment."; exit 1; }
          [ -n "$DEMO_PUBLIC_HEALTH_URL" ] || { echo "::error::DEMO_PUBLIC_HEALTH_URL is required in the selected demo environment."; exit 1; }

      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4

      - name: Set up Go
        uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5
        with:
          go-version: '1.25.9'
          cache: true

      - name: Set up Node.js
        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
        with:
          node-version: '20'
          cache: 'npm'
          cache-dependency-path: 'frontend-modern/package-lock.json'

      - name: Install frontend dependencies
        run: npm --prefix frontend-modern ci

      - name: Restore frontend build cache
        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4
        with:
          path: frontend-modern/dist
          key: frontend-build-${{ hashFiles('frontend-modern/package-lock.json', 'frontend-modern/src/**/*', 'frontend-modern/index.html', 'frontend-modern/postcss.config.cjs', 'frontend-modern/tailwind.config.cjs') }}

      - name: Build frontend
        run: |
          if [ -d "frontend-modern/dist" ] && [ -f "frontend-modern/dist/index.html" ]; then
            echo "Using cached frontend build"
          else
            npm --prefix frontend-modern run build
          fi

          rm -rf internal/api/frontend-modern
          mkdir -p internal/api/frontend-modern
          cp -r frontend-modern/dist internal/api/frontend-modern/

      - name: Capture expected frontend entry asset
        id: frontend
        run: |
          set -euo pipefail
          ENTRY_ASSET="$(grep -o '/assets/index-[^\" ]*\.js' frontend-modern/dist/index.html | head -n 1)"
          [ -n "$ENTRY_ASSET" ] || { echo "::error::Unable to resolve the built frontend entry asset."; exit 1; }
          echo "entry_asset=$ENTRY_ASSET" >> "$GITHUB_OUTPUT"

      - name: Build static binary
        env:
          PULSE_LICENSE_PUBLIC_KEY: ${{ secrets.PULSE_LICENSE_PUBLIC_KEY }}
        run: |
          set -euo pipefail
          VERSION="v$(cat VERSION | tr -d '\n')"
          BUILD_TIME=$(date -u +"%Y-%m-%dT%H:%M:%SZ")
          GIT_COMMIT=$(git rev-parse --short HEAD 2>/dev/null || echo "unknown")
          SERVER_LDFLAGS="$(if [ -n "${PULSE_LICENSE_PUBLIC_KEY:-}" ]; then ./scripts/release_ldflags.sh server --version "${VERSION}" --build-time "${BUILD_TIME}" --git-commit "${GIT_COMMIT}" --license-public-key "${PULSE_LICENSE_PUBLIC_KEY}"; else ./scripts/release_ldflags.sh server --version "${VERSION}" --build-time "${BUILD_TIME}" --git-commit "${GIT_COMMIT}"; fi)"
          CGO_ENABLED=0 go build \
            -ldflags="${SERVER_LDFLAGS}" \
            -buildvcs=false \
            -trimpath \
            -o pulse ./cmd/pulse/

      - name: Tailscale
        uses: tailscale/github-action@4e4c49acaa9818630ce0bd7a564372c17e33fb4d # v2
        with:
          authkey: ${{ secrets.TS_AUTHKEY }}

      - name: Setup SSH
        env:
          DEMO_SERVER_HOST: ${{ secrets.DEMO_SERVER_HOST }}
          DEMO_SERVER_SSH_KEY: ${{ secrets.DEMO_SERVER_SSH_KEY }}
        run: |
          set -euo pipefail
          mkdir -p ~/.ssh
          chmod 700 ~/.ssh
          echo "$DEMO_SERVER_SSH_KEY" > ~/.ssh/id_ed25519
          chmod 600 ~/.ssh/id_ed25519
          ssh-keyscan -H "$DEMO_SERVER_HOST" >> ~/.ssh/known_hosts
          chmod 600 ~/.ssh/known_hosts

      - name: Verify target host identity
        env:
          DEMO_SERVER_HOST: ${{ secrets.DEMO_SERVER_HOST }}
          DEMO_SERVER_USER: ${{ secrets.DEMO_SERVER_USER }}
        run: |
          set -euo pipefail
          REMOTE_HOSTNAME="$(
            ssh -i ~/.ssh/id_ed25519 \
              -o IdentitiesOnly=yes \
              -o StrictHostKeyChecking=yes \
              -o UserKnownHostsFile=~/.ssh/known_hosts \
              "$DEMO_SERVER_USER@$DEMO_SERVER_HOST" \
              "hostname"
          )"
          [ "$REMOTE_HOSTNAME" = "$DEMO_EXPECTED_HOSTNAME" ] || {
            echo "::error::Demo environment points at host $REMOTE_HOSTNAME but expected $DEMO_EXPECTED_HOSTNAME."
            exit 1
          }

      - name: Resolve deploy paths
        id: config
        run: |
          set -euo pipefail
          TARGET="${{ needs.resolve.outputs.target }}"
          SERVICE_NAME="${DEMO_SERVICE_NAME:-}"
          if [ -z "$SERVICE_NAME" ]; then
            case "$TARGET" in
              stable)
                SERVICE_NAME="pulse"
                ;;
              preview-v6)
                SERVICE_NAME="pulse-v6-preview"
                ;;
              *)
                echo "::error::Unsupported demo target: ${TARGET}"
                exit 1
                ;;
            esac
          fi
          if [ "$TARGET" = "preview-v6" ] && [ "$SERVICE_NAME" = "pulse" ]; then
            echo "::error::Preview demo deployments must not target the stable pulse service."
            exit 1
          fi
          INSTALL_DIR="${DEMO_INSTALL_DIR:-}"
          if [ -z "$INSTALL_DIR" ]; then
            if [ "$SERVICE_NAME" = "pulse" ]; then
              INSTALL_DIR="/opt/pulse"
            else
              INSTALL_DIR="/opt/$SERVICE_NAME"
            fi
          fi
          TEST_PORT="${DEMO_TEST_PORT:-8082}"
          AUTH_USER="${DEMO_AUTH_USER:-demo}"
          AUTH_PASS="${DEMO_AUTH_PASS:-demo}"

          echo "service_name=$SERVICE_NAME" >> "$GITHUB_OUTPUT"
          echo "install_dir=$INSTALL_DIR" >> "$GITHUB_OUTPUT"
          echo "test_port=$TEST_PORT" >> "$GITHUB_OUTPUT"
          echo "auth_user=$AUTH_USER" >> "$GITHUB_OUTPUT"
          echo "auth_pass=$AUTH_PASS" >> "$GITHUB_OUTPUT"

      - name: Deploy to server
        env:
          DEPLOY_HOST: ${{ secrets.DEMO_SERVER_HOST }}
          DEPLOY_USER: ${{ secrets.DEMO_SERVER_USER }}
        run: |
          set -euo pipefail
          SSH_OPTS=(
            -i ~/.ssh/id_ed25519
            -o IdentitiesOnly=yes
            -o StrictHostKeyChecking=yes
            -o UserKnownHostsFile=~/.ssh/known_hosts
          )

          TARGET_SERVICE="${{ steps.config.outputs.service_name }}"
          INSTALL_DIR="${{ steps.config.outputs.install_dir }}"
          TEST_PORT="${{ steps.config.outputs.test_port }}"
          AUTH_USER="${{ steps.config.outputs.auth_user }}"
          AUTH_PASS="${{ steps.config.outputs.auth_pass }}"

          ssh "${SSH_OPTS[@]}" "${DEPLOY_USER}@${DEPLOY_HOST}" "rm -f /tmp/pulse-new; rm -rf /tmp/pulse-demo-test" || true
          scp "${SSH_OPTS[@]}" pulse "${DEPLOY_USER}@${DEPLOY_HOST}:/tmp/pulse-new"

          ssh "${SSH_OPTS[@]}" "${DEPLOY_USER}@${DEPLOY_HOST}" \
            "TARGET_SERVICE=$(printf '%q' "$TARGET_SERVICE") INSTALL_DIR=$(printf '%q' "$INSTALL_DIR") TEST_PORT=$(printf '%q' "$TEST_PORT") AUTH_USER=$(printf '%q' "$AUTH_USER") AUTH_PASS=$(printf '%q' "$AUTH_PASS") bash -s" <<'EOF'
          set -euo pipefail
          chmod +x /tmp/pulse-new
          PULSE_DATA_DIR=/tmp/pulse-demo-test \
          FRONTEND_PORT="$TEST_PORT" \
          PULSE_MOCK_MODE=true \
          PULSE_AUTH_USER="$AUTH_USER" \
          PULSE_AUTH_PASS="$AUTH_PASS" \
          nohup /tmp/pulse-new > /tmp/demo-deploy-test.log 2>&1 &
          PID=$!
          sleep 5
          if curl -fsS "http://127.0.0.1:${TEST_PORT}/api/health"; then
            echo 'Health check passed'
            kill "$PID"
            rm -rf /tmp/pulse-demo-test
            rm -f /tmp/demo-deploy-test.log
          else
            echo 'Health check failed'
            cat /tmp/demo-deploy-test.log || true
            kill "$PID" || true
            rm -rf /tmp/pulse-demo-test
            exit 1
          fi

          sudo test -d "$INSTALL_DIR/bin"
          sudo systemctl stop "$TARGET_SERVICE"
          sudo mv /tmp/pulse-new "$INSTALL_DIR/bin/pulse"
          sudo systemctl start "$TARGET_SERVICE"
          EOF

      - name: Verify production
        run: |
          set -euo pipefail
          sleep 5
          curl -fsS "$DEMO_PUBLIC_HEALTH_URL"

      - name: Verify frontend parity
        env:
          DEPLOY_HOST: ${{ secrets.DEMO_SERVER_HOST }}
          DEPLOY_USER: ${{ secrets.DEMO_SERVER_USER }}
        run: |
          set -euo pipefail
          case "$DEMO_PUBLIC_HEALTH_URL" in
            */api/health)
              PUBLIC_ROOT_URL="${DEMO_PUBLIC_HEALTH_URL%/api/health}/"
              ;;
            *)
              echo "::error::DEMO_PUBLIC_HEALTH_URL must end with /api/health for frontend verification."
              exit 1
              ;;
          esac

          SSH_OPTS=(
            -i ~/.ssh/id_ed25519
            -o IdentitiesOnly=yes
            -o StrictHostKeyChecking=yes
            -o UserKnownHostsFile=~/.ssh/known_hosts
          )

          extract_entry_asset() {
            python3 -c 'import re, sys; html = sys.stdin.read(); match = re.search(r"<script\b[^>]*\bsrc=\"(/assets/index-[^\"]*\.js)\"", html); sys.exit(1) if match is None else sys.stdout.write(match.group(1))'
          }

          EXPECTED_ASSET="${{ steps.frontend.outputs.entry_asset }}"
          if ! REMOTE_ASSET="$(
            ssh "${SSH_OPTS[@]}" "${DEPLOY_USER}@${DEPLOY_HOST}" \
              "curl -fsS ${DEMO_LOCAL_BASE_URL}/" | extract_entry_asset
          )"; then
            echo "::error::Failed to resolve the remote frontend entry asset."
            exit 1
          fi
          if ! PUBLIC_ASSET="$(curl -fsS "$PUBLIC_ROOT_URL" | extract_entry_asset)"; then
            echo "::error::Failed to resolve the public frontend entry asset."
            exit 1
          fi
          [ "$REMOTE_ASSET" = "$EXPECTED_ASSET" ] || {
            echo "::error::Remote service is serving $REMOTE_ASSET but the build expected $EXPECTED_ASSET."
            exit 1
          }
          [ "$PUBLIC_ASSET" = "$EXPECTED_ASSET" ] || {
            echo "::error::Public demo is serving $PUBLIC_ASSET but the build expected $EXPECTED_ASSET."
            exit 1
          }

      - name: Verify public browser smoke
        run: |
          set -euo pipefail
          case "$DEMO_PUBLIC_HEALTH_URL" in
            */api/health)
              export PULSE_PUBLIC_SITE_URL="${DEMO_PUBLIC_HEALTH_URL%/api/health}/"
              ;;
            *)
              echo "::error::DEMO_PUBLIC_HEALTH_URL must end with /api/health for browser verification."
              exit 1
              ;;
          esac
          ./scripts/run_demo_public_browser_smoke.sh

      - name: Cleanup SSH material
        if: always()
        run: rm -f ~/.ssh/id_ed25519 ~/.ssh/known_hosts