name: Reusable - Flyway Migration Check

on:
  workflow_call:
    inputs:
      base_ref:
        description: 'The base ref for comparison'
        required: true
        type: string
      head_ref:
        description: 'The head ref for comparison'
        required: true
        type: string
    outputs:
      has_migrations:
        description: "Boolean indicating if migration files were changed"
        value: ${{ jobs.check-for-migrations.outputs.has_migrations }}

jobs:
  check-for-migrations:
    name: Check for DB Migrations
    runs-on: ubuntu-latest
    outputs:
      has_migrations: ${{ steps.check_migrations.outputs.has_migrations }}
    steps:
      - name: Checkout Repository
        uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - name: Detect Flyway Migration Changes
        id: check_migrations
        run: |
          echo "Comparing ${{ inputs.base_ref }}...${{ inputs.head_ref }}"
          if git diff --name-only ${{ inputs.base_ref }}...${{ inputs.head_ref }} | grep -q "booklore-api/src/main/resources/db/migration/V.*.sql"; then
            echo "Migration file changes detected. Proceeding with migration preview."
            echo "has_migrations=true" >> $GITHUB_OUTPUT
          else
            echo "No migration file changes detected. Skipping migration preview."
            echo "has_migrations=false" >> $GITHUB_OUTPUT
          fi

  flyway-migration-preview:
    name: Flyway DB Migration Preview
    needs: [ check-for-migrations ]
    if: needs.check-for-migrations.outputs.has_migrations == 'true'
    runs-on: ubuntu-latest
    services:
      mariadb:
        image: mariadb:10.6
        env:
          MYSQL_ROOT_PASSWORD: root
          MYSQL_DATABASE: booklore_test
        ports:
          - 3306:3306
        options: >-
          --health-cmd="mysqladmin ping --silent"
          --health-interval=5s
          --health-timeout=5s
          --health-retries=10

    steps:
      - name: Checkout Base Branch
        uses: actions/checkout@v6
        with:
          ref: ${{ inputs.base_ref }}
          fetch-depth: 0

      - name: Apply Migrations from Base Branch
        run: |
          echo "Applying migrations from base ref (${{ inputs.base_ref }})..."
          docker run --network host \
            -v ${{ github.workspace }}:/flyway/sql \
            flyway/flyway:11.19.0-alpine \
            -url=jdbc:mariadb://127.0.0.1:3306/booklore_test \
            -user=root -password=root \
            -locations=filesystem:/flyway/sql/booklore-api/src/main/resources/db/migration \
            migrate

      - name: Checkout Head Branch
        uses: actions/checkout@v6
        with:
          ref: ${{ inputs.head_ref }}
          fetch-depth: 0

      - name: Apply Migrations from Head Branch
        run: |
          echo "Applying new migrations from head ref (${{ inputs.head_ref }})..."
          docker run --network host \
            -v ${{ github.workspace }}:/flyway/sql \
            flyway/flyway:11.19.0-alpine \
            -url=jdbc:mariadb://127.0.0.1:3306/booklore_test \
            -user=root -password=root \
            -locations=filesystem:/flyway/sql/booklore-api/src/main/resources/db/migration \
            migrate

      - name: Confirm Flyway Dry Run Success
        run: echo "✅ Flyway migration preview successful. Migrations can be applied cleanly."