# Emergency Rollback Workflow
# Sprint: CI/CD Enhancement - Deployment Safety
#
# Purpose: Automated rollback to previous known-good version
# Triggers: Manual dispatch only (emergency procedure)
#
# SLA Target: < 5 minutes from trigger to rollback complete

name: Emergency Rollback

on:
  workflow_dispatch:
    inputs:
      environment:
        description: 'Target environment'
        required: true
        type: choice
        options:
          - staging
          - production
      service:
        description: 'Service to rollback (or "all" for full rollback)'
        required: true
        type: choice
        options:
          - all
          - authority
          - attestor
          - concelier
          - scanner
          - policy
          - excititor
          - gateway
          - scheduler
          - cli
      target_version:
        description: 'Version to rollback to (leave empty for previous version)'
        required: false
        type: string
      reason:
        description: 'Reason for rollback'
        required: true
        type: string
      skip_health_check:
        description: 'Skip health check (use only in emergencies)'
        required: false
        type: boolean
        default: false

env:
  ROLLBACK_TIMEOUT: 300  # 5 minutes

jobs:
  validate:
    name: Validate Rollback Request
    runs-on: ubuntu-latest
    outputs:
      target_version: ${{ steps.resolve.outputs.version }}
      services: ${{ steps.resolve.outputs.services }}
      approved: ${{ steps.validate.outputs.approved }}

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Validate inputs
        id: validate
        run: |
          echo "## Rollback Request Validation" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "| Parameter | Value |" >> $GITHUB_STEP_SUMMARY
          echo "|-----------|-------|" >> $GITHUB_STEP_SUMMARY
          echo "| Environment | ${{ inputs.environment }} |" >> $GITHUB_STEP_SUMMARY
          echo "| Service | ${{ inputs.service }} |" >> $GITHUB_STEP_SUMMARY
          echo "| Target Version | ${{ inputs.target_version || 'previous' }} |" >> $GITHUB_STEP_SUMMARY
          echo "| Reason | ${{ inputs.reason }} |" >> $GITHUB_STEP_SUMMARY
          echo "| Triggered By | ${{ github.actor }} |" >> $GITHUB_STEP_SUMMARY
          echo "| Timestamp | $(date -u +"%Y-%m-%dT%H:%M:%SZ") |" >> $GITHUB_STEP_SUMMARY

          # Production requires additional validation
          if [[ "${{ inputs.environment }}" == "production" ]]; then
            echo ""
            echo "### Production Rollback Warning" >> $GITHUB_STEP_SUMMARY
            echo "This will affect production users immediately." >> $GITHUB_STEP_SUMMARY
          fi

          echo "approved=true" >> $GITHUB_OUTPUT

      - name: Resolve target version
        id: resolve
        run: |
          VERSION="${{ inputs.target_version }}"
          SERVICE="${{ inputs.service }}"

          # If no version specified, get previous from manifest
          if [[ -z "$VERSION" ]]; then
            MANIFEST="devops/releases/service-versions.json"
            if [[ -f "$MANIFEST" ]]; then
              if [[ "$SERVICE" == "all" ]]; then
                # Get oldest version across all services
                VERSION=$(jq -r '.services | to_entries | map(.value.version) | sort | first // "unknown"' "$MANIFEST")
              else
                VERSION=$(jq -r --arg svc "$SERVICE" '.services[$svc].previousVersion // .services[$svc].version // "unknown"' "$MANIFEST")
              fi
            fi
          fi

          # Determine services to rollback
          if [[ "$SERVICE" == "all" ]]; then
            SERVICES='["authority","attestor","concelier","scanner","policy","excititor","gateway","scheduler"]'
          else
            SERVICES="[\"$SERVICE\"]"
          fi

          echo "Resolved version: $VERSION"
          echo "Services: $SERVICES"

          echo "version=$VERSION" >> $GITHUB_OUTPUT
          echo "services=$SERVICES" >> $GITHUB_OUTPUT

  rollback:
    name: Execute Rollback
    runs-on: ubuntu-latest
    needs: [validate]
    if: needs.validate.outputs.approved == 'true'
    environment: ${{ inputs.environment }}

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Setup kubectl
        uses: azure/setup-kubectl@v3
        with:
          version: 'latest'

      - name: Setup Helm
        uses: azure/setup-helm@v3
        with:
          version: 'latest'

      - name: Configure deployment access
        run: |
          echo "::notice::Configure deployment access for ${{ inputs.environment }}"
          # TODO: Configure kubectl context / kubeconfig
          # kubectl config use-context ${{ inputs.environment }}

      - name: Execute rollback
        id: rollback
        run: |
          echo "Starting rollback..."
          START_TIME=$(date +%s)

          TARGET_VERSION="${{ needs.validate.outputs.target_version }}"
          SERVICES='${{ needs.validate.outputs.services }}'
          ENVIRONMENT="${{ inputs.environment }}"

          # Execute rollback script
          if [[ -f ".gitea/scripts/release/rollback.sh" ]]; then
            .gitea/scripts/release/rollback.sh \
              --environment "$ENVIRONMENT" \
              --version "$TARGET_VERSION" \
              --services "$SERVICES" \
              --reason "${{ inputs.reason }}"
          else
            echo "::warning::Rollback script not found - using placeholder"
            echo ""
            echo "Rollback would execute:"
            echo "  Environment: $ENVIRONMENT"
            echo "  Version: $TARGET_VERSION"
            echo "  Services: $SERVICES"
            echo ""
            echo "TODO: Implement rollback.sh script"
          fi

          END_TIME=$(date +%s)
          DURATION=$((END_TIME - START_TIME))

          echo "duration=$DURATION" >> $GITHUB_OUTPUT
          echo "Rollback completed in ${DURATION}s"

      - name: Health check
        if: inputs.skip_health_check != true
        run: |
          echo "Running health checks..."

          SERVICES='${{ needs.validate.outputs.services }}'

          echo "$SERVICES" | jq -r '.[]' | while read -r service; do
            echo "Checking $service..."
            # TODO: Implement service-specific health checks
            # curl -sf "https://${service}.${{ inputs.environment }}.stella-ops.org/health" || exit 1
            echo "  Status: OK (placeholder)"
          done

          echo "All health checks passed"

      - name: Rollback summary
        if: always()
        run: |
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "## Rollback Execution" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY

          if [[ "${{ steps.rollback.outcome }}" == "success" ]]; then
            echo "### Rollback Successful" >> $GITHUB_STEP_SUMMARY
            echo "" >> $GITHUB_STEP_SUMMARY
            echo "- Duration: ${{ steps.rollback.outputs.duration }}s" >> $GITHUB_STEP_SUMMARY
            echo "- Target Version: ${{ needs.validate.outputs.target_version }}" >> $GITHUB_STEP_SUMMARY
          else
            echo "### Rollback Failed" >> $GITHUB_STEP_SUMMARY
            echo "" >> $GITHUB_STEP_SUMMARY
            echo "Please investigate immediately and consider manual intervention." >> $GITHUB_STEP_SUMMARY
          fi

  notify:
    name: Send Notifications
    runs-on: ubuntu-latest
    needs: [validate, rollback]
    if: always()

    steps:
      - name: Notify team
        run: |
          STATUS="${{ needs.rollback.result }}"
          ENVIRONMENT="${{ inputs.environment }}"
          SERVICE="${{ inputs.service }}"
          ACTOR="${{ github.actor }}"
          REASON="${{ inputs.reason }}"
          VERSION="${{ needs.validate.outputs.target_version }}"

          # Build notification message
          if [[ "$STATUS" == "success" ]]; then
            EMOJI="white_check_mark"
            TITLE="Rollback Completed Successfully"
          else
            EMOJI="x"
            TITLE="Rollback Failed - Immediate Attention Required"
          fi

          echo "Notification:"
          echo "  Title: $TITLE"
          echo "  Environment: $ENVIRONMENT"
          echo "  Service: $SERVICE"
          echo "  Version: $VERSION"
          echo "  Actor: $ACTOR"
          echo "  Reason: $REASON"

          # TODO: Send to Slack/Teams/PagerDuty
          # - name: Slack notification
          #   uses: slackapi/slack-github-action@v1
          #   with:
          #     payload: |
          #       {
          #         "text": "${{ env.TITLE }}",
          #         "blocks": [...]
          #       }

      - name: Create incident record
        run: |
          echo "Creating incident record..."

          # Log to incident tracking
          INCIDENT_LOG="devops/incidents/$(date +%Y-%m-%d)-rollback.json"
          echo "{
            \"timestamp\": \"$(date -u +"%Y-%m-%dT%H:%M:%SZ")\",
            \"type\": \"rollback\",
            \"environment\": \"${{ inputs.environment }}\",
            \"service\": \"${{ inputs.service }}\",
            \"target_version\": \"${{ needs.validate.outputs.target_version }}\",
            \"reason\": \"${{ inputs.reason }}\",
            \"actor\": \"${{ github.actor }}\",
            \"status\": \"${{ needs.rollback.result }}\",
            \"run_id\": \"${{ github.run_id }}\"
          }"

          echo "::notice::Incident record would be created at $INCIDENT_LOG"