const { getDb } = require('../config/db');
const { formatMoney, parseMoney } = require('../utils/money');

function calculateProviderCost(providerPrice, quantity) {
  return (parseMoney(String(providerPrice)) * BigInt(quantity) + 500n) / 1000n;
}

async function listAdminUsers() {
  return getDb()('users')
    .select('id', 'username', 'email', 'role', 'status', 'balance', 'created_at', 'updated_at')
    .orderBy('created_at', 'desc')
    .orderBy('id', 'desc');
}

async function getAdminStats() {
  const db = getDb();
  const [[usersTotal], [activeUsers], [pendingDeposits], [pendingOrders], orders] = await Promise.all([
    db('users').count({ count: '*' }),
    db('users').where({ status: 'active' }).count({ count: '*' }),
    db('deposits').where({ status: 'pending' }).count({ count: '*' }),
    db('orders').whereIn('status', ['pending', 'processing', 'in_progress']).count({ count: '*' }),
    db('orders')
      .join('services', 'services.id', 'orders.service_id')
      .select('orders.charge', 'orders.quantity', 'services.provider_price', 'orders.status')
  ]);
  let grossSales = 0n;
  let providerCost = 0n;

  for (const order of orders) {
    if (!['processing', 'in_progress', 'completed', 'partial'].includes(order.status)) {
      continue;
    }

    grossSales += parseMoney(order.charge);
    providerCost += calculateProviderCost(order.provider_price, order.quantity);
  }

  return {
    users_total: Number(usersTotal.count),
    users_active: Number(activeUsers.count),
    deposits_pending: Number(pendingDeposits.count),
    orders_pending: Number(pendingOrders.count),
    gross_sales: formatMoney(grossSales),
    provider_cost: formatMoney(providerCost),
    profit: formatMoney(grossSales - providerCost)
  };
}

module.exports = {
  getAdminStats,
  listAdminUsers
};