import { NextRequest, NextResponse } from 'next/server';
import {
  getDayOfWeekAnalytics,
  getMonthOfYearAnalytics,
  getSeasonalityByAttribute,
} from '@/lib/analytics/seasonality.service';
import { parseAnalyticsParams } from '../_utils';

export async function GET(request: NextRequest) {
  try {
    const filters = parseAnalyticsParams(request);
    const { searchParams } = new URL(request.url);
    const view = searchParams.get('view') || 'day-of-week';
    const attribute = searchParams.get('attribute') as 'size' | 'color' | null;

    let result;
    switch (view) {
      case 'month-of-year':
        result = await getMonthOfYearAnalytics(filters);
        break;
      case 'by-attribute':
        if (attribute && ['size', 'color'].includes(attribute)) {
          result = await getSeasonalityByAttribute(filters, attribute);
        } else {
          return NextResponse.json(
            { error: 'attribute parameter required (size or color)' },
            { status: 422 },
          );
        }
        break;
      default:
        result = await getDayOfWeekAnalytics(filters);
    }

    return NextResponse.json(result);
  } catch (error) {
    console.error('GET /api/analytics/seasonality error:', error);
    return NextResponse.json({ error: 'Failed to fetch seasonality analytics' }, { status: 500 });
  }
}