/**
 * API Route: Wallet Withdrawal
 * 
 * POST /api/wallets/:leagueId/withdraw
 * 
 * Handles withdrawal requests from league wallets.
 * Enforces the rule that withdrawals are only allowed after season is completed.
 */

import { NextRequest, NextResponse } from 'next/server';

interface WithdrawRequest {
  amount: number;
  currency: string;
  seasonId: string;
  destinationAccount: string;
}

// Mock season status lookup
const MOCK_SEASONS: Record<string, { status: 'planned' | 'active' | 'completed'; name: string }> = {
  'season-1': { status: 'completed', name: 'Season 1' },
  'season-2': { status: 'active', name: 'Season 2' },
  'season-3': { status: 'planned', name: 'Season 3' },
};

// Mock wallet balances
const MOCK_WALLETS: Record<string, { balance: number; currency: string }> = {
  'league-1': { balance: 2500, currency: 'USD' },
  'league-2': { balance: 1200, currency: 'USD' },
};

export async function POST(
  request: NextRequest,
  { params }: { params: Promise<{ leagueId: string }> }
) {
  try {
    const { leagueId } = await params;
    const body: WithdrawRequest = await request.json();

    // Validate required fields
    if (!body.amount || body.amount <= 0) {
      return NextResponse.json(
        { error: 'Invalid withdrawal amount' },
        { status: 400 }
      );
    }

    if (!body.seasonId) {
      return NextResponse.json(
        { error: 'Season ID is required' },
        { status: 400 }
      );
    }

    if (!body.destinationAccount) {
      return NextResponse.json(
        { error: 'Destination account is required' },
        { status: 400 }
      );
    }

    // Get season status
    const season = MOCK_SEASONS[body.seasonId];
    if (!season) {
      return NextResponse.json(
        { error: 'Season not found' },
        { status: 404 }
      );
    }

    // CRITICAL: Enforce withdrawal restriction based on season status
    // Withdrawals are ONLY allowed when the season is completed
    if (season.status !== 'completed') {
      return NextResponse.json(
        { 
          error: 'Withdrawal not allowed',
          reason: `Withdrawals are only permitted after the season is completed. "${season.name}" is currently ${season.status}.`,
          seasonStatus: season.status,
        },
        { status: 403 }
      );
    }

    // Get wallet
    const wallet = MOCK_WALLETS[leagueId];
    if (!wallet) {
      return NextResponse.json(
        { error: 'Wallet not found' },
        { status: 404 }
      );
    }

    // Check sufficient balance
    if (wallet.balance < body.amount) {
      return NextResponse.json(
        { 
          error: 'Insufficient balance',
          available: wallet.balance,
          requested: body.amount,
        },
        { status: 400 }
      );
    }

    // Check currency match
    if (wallet.currency !== body.currency) {
      return NextResponse.json(
        { 
          error: 'Currency mismatch',
          walletCurrency: wallet.currency,
          requestedCurrency: body.currency,
        },
        { status: 400 }
      );
    }

    // Process withdrawal (in-memory mock)
    const newBalance = wallet.balance - body.amount;
    MOCK_WALLETS[leagueId] = { ...wallet, balance: newBalance };

    // Generate transaction ID
    const transactionId = `txn-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;

    return NextResponse.json({
      success: true,
      transactionId,
      amount: body.amount,
      currency: body.currency,
      newBalance,
      destinationAccount: body.destinationAccount,
      processedAt: new Date().toISOString(),
    });

  } catch (error) {
    console.error('Wallet withdrawal error:', error);
    return NextResponse.json(
      { error: 'Internal server error' },
      { status: 500 }
    );
  }
}

/**
 * GET /api/wallets/:leagueId/withdraw
 * 
 * Check withdrawal eligibility for a league's wallet
 */
export async function GET(
  request: NextRequest,
  { params }: { params: Promise<{ leagueId: string }> }
) {
  try {
    const { leagueId } = await params;
    const { searchParams } = new URL(request.url);
    const seasonId = searchParams.get('seasonId');

    if (!seasonId) {
      return NextResponse.json(
        { error: 'Season ID is required' },
        { status: 400 }
      );
    }

    const season = MOCK_SEASONS[seasonId];
    if (!season) {
      return NextResponse.json(
        { error: 'Season not found' },
        { status: 404 }
      );
    }

    const wallet = MOCK_WALLETS[leagueId];
    if (!wallet) {
      return NextResponse.json(
        { error: 'Wallet not found' },
        { status: 404 }
      );
    }

    const canWithdraw = season.status === 'completed';
    
    return NextResponse.json({
      leagueId,
      seasonId,
      seasonName: season.name,
      seasonStatus: season.status,
      canWithdraw,
      reason: canWithdraw 
        ? 'Season is completed, withdrawals are allowed'
        : `Withdrawals are only permitted after the season is completed. Season is currently ${season.status}.`,
      balance: wallet.balance,
      currency: wallet.currency,
    });

  } catch (error) {
    console.error('Withdrawal eligibility check error:', error);
    return NextResponse.json(
      { error: 'Internal server error' },
      { status: 500 }
    );
  }
}