/**
 * POST /api/referrals - Create referral code
 * GET /api/referrals - Get user's referrals
 */

import { NextRequest, NextResponse } from 'next/server';
import { requireAuth } from '@/app/lib/auth';
import { getUserReferrals, findUser } from '@/app/lib/db/store';
import { Referral, ApiResponse } from '@/app/lib/types';

interface ReferralCodeResponse {
  referralCode: string;
  referralLink: string;
}

export async function GET(request: NextRequest) {
  try {
    // Authenticate user
    const user = requireAuth(request);

    // Get user's referrals with referred user details
    const referrals = getUserReferrals(user.id);

    const referralsWithDetails = referrals.map(ref => {
      const referredUser = findUser(ref.referredId);
      return {
        ...ref,
        referredUserName: referredUser?.name || 'Unknown'
      };
    });

    return NextResponse.json<ApiResponse>(
      {
        success: true,
        data: {
          referrals: referralsWithDetails,
          totalReferrals: referrals.length,
          totalBonusEarned: referrals.reduce((sum, ref) => sum + ref.bonusPoints, 0)
        }
      },
      { status: 200 }
    );
  } catch (error) {
    if (error instanceof Error && error.message === 'Unauthorized') {
      return NextResponse.json<ApiResponse>(
        {
          success: false,
          error: 'Unauthorized'
        },
        { status: 401 }
      );
    }

    console.error('Get referrals error:', error);
    return NextResponse.json<ApiResponse>(
      {
        success: false,
        error: 'Internal server error'
      },
      { status: 500 }
    );
  }
}

export async function POST(request: NextRequest) {
  try {
    // Authenticate user
    const user = requireAuth(request);

    // Generate referral code (base64 encoded user ID)
    const referralCode = Buffer.from(user.id).toString('base64');

    // Build referral link
    const baseUrl = process.env.NEXT_PUBLIC_APP_URL || 'http://localhost:3000';
    const referralLink = `${baseUrl}/register?ref=${referralCode}`;

    const response: ReferralCodeResponse = {
      referralCode,
      referralLink
    };

    return NextResponse.json<ApiResponse<ReferralCodeResponse>>(
      {
        success: true,
        data: response,
        message: 'Referral code generated successfully'
      },
      { status: 200 }
    );
  } catch (error) {
    if (error instanceof Error && error.message === 'Unauthorized') {
      return NextResponse.json<ApiResponse>(
        {
          success: false,
          error: 'Unauthorized'
        },
        { status: 401 }
      );
    }

    console.error('Create referral code error:', error);
    return NextResponse.json<ApiResponse>(
      {
        success: false,
        error: 'Internal server error'
      },
      { status: 500 }
    );
  }
}