name: Database Schema Check

on:
  pull_request:
    paths:
      - 'prisma/**'
      - '.github/workflows/schema-check.yml'

jobs:
  schema-check:
    runs-on: ubuntu-latest

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

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '20'
          cache: 'npm'

      - name: Install dependencies
        run: npm ci

      - name: Validate Prisma schema
        run: npx prisma validate

      - name: Format Prisma schema
        run: npx prisma format --check

      - name: Generate Prisma Client
        run: npx prisma generate

      - name: Check for migration drift
        run: |
          # This checks if schema.prisma matches the current migrations
          # If there are changes without migrations, this will fail
          npx prisma migrate diff \
            --from-schema-datamodel prisma/schema.prisma \
            --to-schema-datasource prisma/schema.prisma \
            --script > migration-diff.sql

          if [ -s migration-diff.sql ]; then
            echo "Schema changes detected without migration!"
            echo "Run 'npx prisma migrate dev' to create a migration"
            cat migration-diff.sql
            exit 1
          fi
        continue-on-error: true

      - name: Comment PR with schema changes
        if: failure()
        uses: actions/github-script@v7
        with:
          script: |
            github.rest.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: '[WARN] Schema changes detected. Please generate a migration with `npx prisma migrate dev`'
            })