# MotoVaultPro GitLab CI/CD Pipeline - Blue-Green Deployment
# GitLab 18.6+ with separate build and production runners
# See docs/CICD-DEPLOY.md for complete documentation
# v2.0 - Blue-Green with Auto-Rollback

stages:
  - validate
  - build
  - deploy-prepare
  - deploy-switch
  - verify
  - rollback
  - notify

variables:
  # Registry configuration
  REGISTRY: registry.motovaultpro.com
  REGISTRY_MIRRORS: ${REGISTRY}/mirrors
  IMAGE_TAG: ${CI_COMMIT_SHORT_SHA}
  BACKEND_IMAGE: ${REGISTRY}/motovaultpro/backend:${IMAGE_TAG}
  FRONTEND_IMAGE: ${REGISTRY}/motovaultpro/frontend:${IMAGE_TAG}

  # Deployment configuration
  GIT_CLONE_PATH: ${CI_BUILDS_DIR}/motovaultpro
  DEPLOY_PATH: ${CI_BUILDS_DIR}/motovaultpro
  COMPOSE_FILE: docker-compose.yml
  COMPOSE_BLUE_GREEN: docker-compose.blue-green.yml

  # Health check configuration
  HEALTH_CHECK_TIMEOUT: "60"

# Default after_script to fix permissions
default:
  after_script:
    - echo "Fixing file permissions..."
    - sudo chown -R gitlab-runner:gitlab-runner "$DEPLOY_PATH" 2>/dev/null || true
    - sudo chown -R 1001:1001 "$DEPLOY_PATH/data/backups" "$DEPLOY_PATH/data/documents" 2>/dev/null || true

# ============================================
# Stage 1: VALIDATE
# Check prerequisites before starting pipeline
# ============================================
validate:
  stage: validate
  tags:
    - production
    - shell
  only:
    - main
  script:
    - echo "=========================================="
    - echo "Validating deployment prerequisites..."
    - echo "=========================================="
    - echo "Checking Docker..."
    - docker info > /dev/null 2>&1 || (echo "ERROR - Docker not accessible" && exit 1)
    - echo "OK - Docker is accessible"
    - echo "Checking Docker Compose..."
    - docker compose version > /dev/null 2>&1 || (echo "ERROR - Docker Compose not available" && exit 1)
    - echo "OK - Docker Compose is available"
    - echo "Checking deployment path..."
    - test -d "$DEPLOY_PATH" || (echo "ERROR - DEPLOY_PATH not found" && exit 1)
    - echo "OK - Deployment path exists"
    - echo "Checking registry access..."
    - echo "$CI_REGISTRY_PASSWORD" | docker login -u "$CI_REGISTRY_USER" --password-stdin "$REGISTRY" || true
    - echo "OK - Registry authentication configured"
    - echo "Determining target stack..."
    - |
      STATE_FILE="$DEPLOY_PATH/config/deployment/state.json"
      if [ -f "$STATE_FILE" ] && command -v jq &> /dev/null; then
        ACTIVE_STACK=$(jq -r '.active_stack // "blue"' "$STATE_FILE")
        if [ "$ACTIVE_STACK" = "blue" ]; then
          echo "TARGET_STACK=green" >> deploy.env
        else
          echo "TARGET_STACK=blue" >> deploy.env
        fi
      else
        echo "TARGET_STACK=green" >> deploy.env
      fi
      cat deploy.env
    - echo "=========================================="
    - echo "Validation complete"
    - echo "=========================================="
  artifacts:
    reports:
      dotenv: deploy.env

# ============================================
# Stage 2: BUILD
# Build and push images to GitLab Container Registry
# Runs on dedicated build server (shell executor)
# ============================================
build:
  stage: build
  tags:
    - build
  only:
    - main
  script:
    - echo "Authenticating with GitLab Container Registry..."
    - echo "$CI_REGISTRY_PASSWORD" | docker login -u "$CI_REGISTRY_USER" --password-stdin "$REGISTRY"
    - echo "=========================================="
    - echo "Building Docker images..."
    - echo "Commit - ${CI_COMMIT_SHORT_SHA}"
    - echo "Backend - ${BACKEND_IMAGE}"
    - echo "Frontend - ${FRONTEND_IMAGE}"
    - echo "=========================================="

    # Build backend
    - echo "Building backend..."
    - |
      docker build \
        --build-arg BUILDKIT_INLINE_CACHE=1 \
        --cache-from ${REGISTRY}/motovaultpro/backend:latest \
        -t ${BACKEND_IMAGE} \
        -t ${REGISTRY}/motovaultpro/backend:latest \
        -f backend/Dockerfile \
        .

    # Build frontend
    - echo "Building frontend..."
    - |
      docker build \
        --build-arg BUILDKIT_INLINE_CACHE=1 \
        --build-arg VITE_AUTH0_DOMAIN=${VITE_AUTH0_DOMAIN:-motovaultpro.us.auth0.com} \
        --build-arg VITE_AUTH0_CLIENT_ID=${VITE_AUTH0_CLIENT_ID:-yspR8zdnSxmV8wFIghHynQ08iXAPoQJ3} \
        --build-arg VITE_AUTH0_AUDIENCE=${VITE_AUTH0_AUDIENCE:-https://api.motovaultpro.com} \
        --build-arg VITE_API_BASE_URL=/api \
        --cache-from ${REGISTRY}/motovaultpro/frontend:latest \
        -t ${FRONTEND_IMAGE} \
        -t ${REGISTRY}/motovaultpro/frontend:latest \
        -f frontend/Dockerfile \
        frontend

    # Push images
    - echo "Pushing images to registry..."
    - docker push ${BACKEND_IMAGE}
    - docker push ${FRONTEND_IMAGE}
    - docker push ${REGISTRY}/motovaultpro/backend:latest
    - docker push ${REGISTRY}/motovaultpro/frontend:latest

    - echo "=========================================="
    - echo "Build complete"
    - echo "=========================================="

# ============================================
# Stage 3: DEPLOY-PREPARE
# Pull images, start inactive stack, run health checks
# ============================================
deploy-prepare:
  stage: deploy-prepare
  tags:
    - production
    - shell
  only:
    - main
  needs:
    - job: validate
      artifacts: true
    - job: build
  environment:
    name: production
    url: https://motovaultpro.com
  script:
    - echo "=========================================="
    - echo "Preparing deployment to ${TARGET_STACK} stack..."
    - echo "=========================================="
    - cd "$DEPLOY_PATH"

    # Authenticate with registry
    - echo "Authenticating with registry..."
    - echo "$CI_REGISTRY_PASSWORD" | docker login -u "$CI_REGISTRY_USER" --password-stdin "$REGISTRY"

    # Inject secrets
    - echo "Step 1/5 - Injecting secrets..."
    - chmod +x scripts/inject-secrets.sh
    - ./scripts/inject-secrets.sh

    # Initialize data directories
    - echo "Step 2/5 - Initializing data directories..."
    - sudo mkdir -p data/backups data/documents
    - sudo chown -R 1001:1001 data/backups data/documents
    - sudo chmod 755 data/backups data/documents

    # Pull new images
    - echo "Step 3/5 - Pulling images..."
    - docker pull ${BACKEND_IMAGE}
    - docker pull ${FRONTEND_IMAGE}

    # Start inactive stack
    - echo "Step 4/5 - Starting ${TARGET_STACK} stack..."
    - |
      export BACKEND_IMAGE=${BACKEND_IMAGE}
      export FRONTEND_IMAGE=${FRONTEND_IMAGE}
      docker compose -f $COMPOSE_FILE -f $COMPOSE_BLUE_GREEN up -d \
        mvp-frontend-${TARGET_STACK} mvp-backend-${TARGET_STACK}

    # Wait for stack to be ready
    - echo "Step 5/5 - Waiting for stack health..."
    - sleep 10

    # Run health check
    - echo "Running health check on ${TARGET_STACK} stack..."
    - chmod +x scripts/ci/health-check.sh
    - ./scripts/ci/health-check.sh ${TARGET_STACK} ${HEALTH_CHECK_TIMEOUT}

    # Update state with deployment info
    - |
      STATE_FILE="config/deployment/state.json"
      if [ -f "$STATE_FILE" ] && command -v jq &> /dev/null; then
        TIMESTAMP=$(date -u +"%Y-%m-%dT%H:%M:%SZ")
        jq --arg stack "$TARGET_STACK" \
           --arg commit "$CI_COMMIT_SHORT_SHA" \
           --arg ts "$TIMESTAMP" \
           '.[$stack].version = $commit | .[$stack].commit = $commit | .[$stack].deployed_at = $ts | .[$stack].healthy = true' \
           "$STATE_FILE" > "${STATE_FILE}.tmp" && mv "${STATE_FILE}.tmp" "$STATE_FILE"
      fi

    - echo "=========================================="
    - echo "Deploy preparation complete"
    - echo "=========================================="

# ============================================
# Stage 4: DEPLOY-SWITCH
# Switch traffic to new stack
# ============================================
deploy-switch:
  stage: deploy-switch
  tags:
    - production
    - shell
  only:
    - main
  needs:
    - job: validate
      artifacts: true
    - job: deploy-prepare
  script:
    - echo "=========================================="
    - echo "Switching traffic to ${TARGET_STACK} stack..."
    - echo "=========================================="
    - cd "$DEPLOY_PATH"

    # Switch traffic
    - chmod +x scripts/ci/switch-traffic.sh
    - ./scripts/ci/switch-traffic.sh ${TARGET_STACK} instant

    # Update state
    - |
      STATE_FILE="config/deployment/state.json"
      if [ -f "$STATE_FILE" ] && command -v jq &> /dev/null; then
        TIMESTAMP=$(date -u +"%Y-%m-%dT%H:%M:%SZ")
        jq --arg commit "$CI_COMMIT_SHORT_SHA" \
           --arg ts "$TIMESTAMP" \
           '.last_deployment = $ts | .last_deployment_commit = $commit | .last_deployment_status = "success" | .rollback_available = true' \
           "$STATE_FILE" > "${STATE_FILE}.tmp" && mv "${STATE_FILE}.tmp" "$STATE_FILE"
      fi

    - echo "=========================================="
    - echo "Traffic switch complete"
    - echo "=========================================="

# ============================================
# Stage 5: VERIFY
# Production health verification after switch
# ============================================
verify:
  stage: verify
  tags:
    - production
    - shell
  only:
    - main
  needs:
    - job: validate
      artifacts: true
    - job: deploy-switch
  script:
    - echo "=========================================="
    - echo "Verifying production deployment..."
    - echo "=========================================="
    - cd "$DEPLOY_PATH"

    # Wait for Traefik to propagate routing
    - echo "Waiting for traffic routing to stabilize..."
    - sleep 5

    # Verify via external endpoint
    - echo "Checking external endpoint..."
    - |
      for i in 1 2 3 4 5 6; do
        if curl -sf https://motovaultpro.com/api/health > /dev/null 2>&1; then
          echo "OK - External health check passed"
          break
        fi
        if [ $i -eq 6 ]; then
          echo "ERROR - External health check failed after 6 attempts"
          exit 1
        fi
        echo "Attempt $i/6 - Waiting 10s..."
        sleep 10
      done

    # Verify container status
    - echo "Checking container status..."
    - |
      for service in mvp-frontend-${TARGET_STACK} mvp-backend-${TARGET_STACK}; do
        status=$(docker inspect --format='{{.State.Status}}' $service 2>/dev/null || echo "not found")
        health=$(docker inspect --format='{{.State.Health.Status}}' $service 2>/dev/null || echo "unknown")
        if [ "$status" != "running" ] || [ "$health" != "healthy" ]; then
          echo "ERROR - $service is not healthy (status: $status, health: $health)"
          docker logs $service --tail 50 2>/dev/null || true
          exit 1
        fi
        echo "OK - $service is running and healthy"
      done

    - echo "=========================================="
    - echo "Deployment verified successfully!"
    - echo "Version ${CI_COMMIT_SHORT_SHA} is now live"
    - echo "=========================================="

# ============================================
# Stage 6: ROLLBACK (on failure)
# Automatic rollback if verify stage fails
# ============================================
rollback:
  stage: rollback
  tags:
    - production
    - shell
  only:
    - main
  when: on_failure
  needs:
    - job: validate
      artifacts: true
    - job: deploy-switch
    - job: verify
  script:
    - echo "=========================================="
    - echo "INITIATING AUTO-ROLLBACK"
    - echo "=========================================="
    - cd "$DEPLOY_PATH"

    # Run rollback script
    - chmod +x scripts/ci/auto-rollback.sh
    - ./scripts/ci/auto-rollback.sh "Verify stage failed - automatic rollback"

    # Update state
    - |
      STATE_FILE="config/deployment/state.json"
      if [ -f "$STATE_FILE" ] && command -v jq &> /dev/null; then
        jq '.last_deployment_status = "rolled_back"' "$STATE_FILE" > "${STATE_FILE}.tmp" && mv "${STATE_FILE}.tmp" "$STATE_FILE"
      fi

    - echo "=========================================="
    - echo "Rollback complete"
    - echo "=========================================="

# ============================================
# Stage 7: NOTIFY
# Send deployment notifications
# ============================================
notify-success:
  stage: notify
  tags:
    - production
    - shell
  only:
    - main
  needs:
    - job: verify
  script:
    - echo "Sending success notification..."
    - cd "$DEPLOY_PATH"
    - chmod +x scripts/ci/notify.sh
    - ./scripts/ci/notify.sh success "Version ${CI_COMMIT_SHORT_SHA} deployed successfully" ${CI_COMMIT_SHORT_SHA}

notify-failure:
  stage: notify
  tags:
    - production
    - shell
  only:
    - main
  when: on_failure
  needs:
    - job: build
      optional: true
    - job: deploy-prepare
      optional: true
    - job: deploy-switch
      optional: true
    - job: verify
      optional: true
  script:
    - echo "Sending failure notification..."
    - cd "$DEPLOY_PATH"
    - chmod +x scripts/ci/notify.sh
    - ./scripts/ci/notify.sh failure "Deployment of ${CI_COMMIT_SHORT_SHA} failed" ${CI_COMMIT_SHORT_SHA}

# ============================================
# Manual Jobs
# ============================================

# Manual maintenance migration job
maintenance-migration:
  stage: deploy-prepare
  tags:
    - production
    - shell
  only:
    - main
  when: manual
  script:
    - echo "=========================================="
    - echo "MAINTENANCE MODE MIGRATION"
    - echo "=========================================="
    - cd "$DEPLOY_PATH"
    - chmod +x scripts/ci/maintenance-migrate.sh
    - ./scripts/ci/maintenance-migrate.sh backup

# Mirror base images (scheduled or manual)
mirror-images:
  stage: build
  tags:
    - build
  only:
    - schedules
    - web
  when: manual
  script:
    - echo "Mirroring base images to GitLab Container Registry..."
    - echo "$CI_REGISTRY_PASSWORD" | docker login -u "$CI_REGISTRY_USER" --password-stdin "$REGISTRY"
    - chmod +x scripts/ci/mirror-base-images.sh
    - REGISTRY=${REGISTRY}/mirrors ./scripts/ci/mirror-base-images.sh