// India-specific utilities for FreightDesk

const STATES = {
  KL:'Kerala',TN:'Tamil Nadu',KA:'Karnataka',AP:'Andhra Pradesh',TS:'Telangana',
  MH:'Maharashtra',GJ:'Gujarat',RJ:'Rajasthan',UP:'Uttar Pradesh',DL:'Delhi',
  HR:'Haryana',PB:'Punjab',WB:'West Bengal',MP:'Madhya Pradesh',GA:'Goa',
};

function formatINR(n) {
  if (n === null || n === undefined || isNaN(n)) return '—';
  return '₹' + parseFloat(n).toLocaleString('en-IN');
}

function formatINRShort(n) {
  if (n === null || n === undefined || isNaN(n)) return '—';
  const num = parseFloat(n);
  if (num >= 100000) return '₹' + (num / 100000).toFixed(1) + 'L';
  if (num >= 1000) return '₹' + (num / 1000).toFixed(1) + 'K';
  return '₹' + num.toLocaleString('en-IN');
}

function formatDate(dateStr) {
  if (!dateStr) return '—';
  const d = new Date(dateStr);
  if (isNaN(d.getTime())) return dateStr;
  return d.toLocaleDateString('en-IN', { day: '2-digit', month: 'short', year: 'numeric' });
}

function formatDateShort(dateStr) {
  if (!dateStr) return '—';
  const d = new Date(dateStr);
  if (isNaN(d.getTime())) return dateStr;
  return d.toLocaleDateString('en-IN', { day: '2-digit', month: 'short' });
}

function validateVehicleNumber(number) {
  if (!number) return { valid: false };
  const cleaned = number.replace(/[\s\-\.]/g, '').toUpperCase();
  if (!/^[A-Z]{2}\d{1,2}[A-Z]{1,3}\d{4}$/.test(cleaned)) return { valid: false };
  const sc = cleaned.substring(0, 2);
  return {
    valid: true,
    state_code: sc,
    state_name: STATES[sc] || 'Unknown',
    formatted: `${cleaned.substring(0,2)} ${cleaned.substring(2,4)} ${cleaned.substring(4,cleaned.length-4)} ${cleaned.slice(-4)}`,
  };
}

function getStatusColor(status) {
  const colors = {
    'settled': 'green',
    'completed': 'green',
    'commission received': 'green',
    'reconciled': 'green',
    'handled directly by shipper': 'green',
    'loaded / in transit': 'blue',
    'assigned': 'blue',
    'assigned vehicle': 'blue',
    'pending collection': 'orange',
    'partially pending': 'orange',
    'fully pending from shipper': 'orange',
    'delivered / pending collection': 'orange',
    'commission due': 'orange',
    'pending lead': 'gray',
    'partial': 'gray',
    'available vehicle': 'gray',
    'commission adjusted': 'purple',
    'cancelled': 'red',
  };
  return colors[status] || 'gray';
}

function calcCommission(freight, paidToDriver) {
  if (!freight || !paidToDriver) return null;
  return freight - paidToDriver;
}

function calcPendingFromShipper(freight, advance) {
  if (!freight) return null;
  return freight - (advance || 0);
}

function calcPendingToDriver(driverFreight, paid) {
  if (!driverFreight) return null;
  return driverFreight - (paid || 0);
}

module.exports = {
  STATES, formatINR, formatINRShort, formatDate, formatDateShort,
  validateVehicleNumber, getStatusColor,
  calcCommission, calcPendingFromShipper, calcPendingToDriver,
};