name: Database Migration

on:
  push:
    paths:
      - 'prisma/schema.prisma'
      - 'prisma/migrations/**'
    branches: [main, develop]
  pull_request:
    paths:
      - 'prisma/schema.prisma'
      - 'prisma/migrations/**'
  workflow_dispatch:
    inputs:
      run_deploy:
        description: 'Run deploy migration against staging DB'
        type: boolean
        default: false

env:
  NODE_VERSION: '22'

jobs:
  # ═══════════════════════════════════════════════════════════════
  # 1. Validate schema + migration consistency
  # ═══════════════════════════════════════════════════════════════

  validate:
    name: Validate Schema
    runs-on: ubuntu-latest
    timeout-minutes: 5
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: 'npm'
      - run: npm ci
      - run: npx prisma generate
        env:
          DATABASE_URL: ${{ secrets.MIGRATION_DATABASE_URL || 'mysql://placeholder:placeholder@localhost:3306/placeholder' }}

      - name: Validate no schema drift
        run: |
          echo "Checking prisma schema is formatted..."
          npx prisma format
          if ! git diff --exit-code prisma/schema.prisma; then
            echo "::error::prisma/schema.prisma has unformatted changes. Run 'npx prisma format' locally."
            exit 1
          fi

      - name: Validate prisma generate output
        run: |
          if [ ! -f node_modules/.prisma/client/index.js ]; then
            echo "::error::Prisma Client not generated"
            exit 1
          fi

  # ═══════════════════════════════════════════════════════════════
  # 2. Dry-run migration (check what would be applied)
  # ═══════════════════════════════════════════════════════════════

  dry-run:
    name: Dry-Run Migration
    runs-on: ubuntu-latest
    timeout-minutes: 10
    needs: validate
    services:
      mysql:
        image: mysql:8.0
        env:
          MYSQL_ROOT_PASSWORD: testpass
          MYSQL_DATABASE: zhixi_test
        ports:
          - 3306:3306
        options: >-
          --health-cmd "mysqladmin ping -h localhost"
          --health-interval 10s
          --health-timeout 5s
          --health-retries 5
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: 'npm'
      - run: npm ci
      - run: npx prisma generate
        env:
          DATABASE_URL: mysql://root:testpass@127.0.0.1:3306/zhixi_test

      - name: Push schema to temp DB
        run: npx prisma db push --skip-generate --accept-data-loss
        env:
          DATABASE_URL: mysql://root:testpass@127.0.0.1:3306/zhixi_test

      - name: Apply migrations
        run: npx prisma migrate deploy
        env:
          DATABASE_URL: mysql://root:testpass@127.0.0.1:3306/zhixi_test

      - name: Verify migration completed
        run: npx prisma migrate status
        env:
          DATABASE_URL: mysql://root:testpass@127.0.0.1:3306/zhixi_test

  # ═══════════════════════════════════════════════════════════════
  # 3. Deploy migration (staging/production)
  # ═══════════════════════════════════════════════════════════════

  deploy-migration:
    name: Deploy Migration
    runs-on: ubuntu-latest
    timeout-minutes: 10
    needs: dry-run
    if: github.event_name == 'workflow_dispatch' && inputs.run_deploy
    environment: staging
    steps:
      - uses: actions/checkout@v4

      - name: Deploy migration via SSH
        uses: appleboy/ssh-action@v1
        with:
          host: ${{ secrets.DEPLOY_HOST }}
          username: ${{ secrets.DEPLOY_USER }}
          key: ${{ secrets.DEPLOY_SSH_KEY }}
          script: |
            set -e
            cd /opt/zhixi/api-server

            echo "=== Migration status before ==="
            docker compose exec -T api npx prisma migrate status

            echo "=== Applying migrations ==="
            docker compose exec -T api npx prisma migrate deploy

            echo "=== Migration status after ==="
            docker compose exec -T api npx prisma migrate status