import React, { useState } from 'react';
import { validatePhone } from '@/lib/validation';

interface PhoneInputProps extends Omit<React.InputHTMLAttributes<HTMLInputElement>, 'onChange'> {
  value?: string;
  onChange: (val: string) => void;
  label?: string;
  error?: string;
  required?: boolean;
  className?: string;
  placeholder?: string;
}

export const PhoneInput: React.FC<PhoneInputProps> = ({
  value,
  onChange,
  label,
  error: customError,
  required = false,
  className = '',
  placeholder = '98765 43210',
  disabled,
  ...props
}) => {
  const [touched, setTouched] = useState(false);

  // Normalize current value to bare 10 digits for input display
  let displayValue = value || '';
  if (displayValue.startsWith('+91')) displayValue = displayValue.slice(3);
  else if (displayValue.startsWith('91') && displayValue.length === 12) displayValue = displayValue.slice(2);

  const handleChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    let raw = e.target.value.replace(/\D/g, ''); // keep only numbers
    if (raw.length > 10) raw = raw.slice(0, 10);
    onChange(raw);
  };

  const validationError = touched ? validatePhone(displayValue, required) : null;
  const displayError = customError || validationError;

  return (
    <div className={`space-y-1 ${className}`}>
      {label && (
        <label className="block text-[13px] font-medium text-gray-700">
          {label} {required && <span className="text-red-500">*</span>}
        </label>
      )}
      <div className="relative flex rounded-lg shadow-sm">
        {/* Fixed +91 Prefix Badge */}
        <span className="inline-flex items-center px-3 rounded-l-lg border border-r-0 border-gray-300 bg-gray-50 text-gray-700 font-semibold text-[13px] select-none shrink-0">
          🇮🇳 +91
        </span>
        <input
          {...props}
          type="tel"
          inputMode="numeric"
          pattern="[0-9]*"
          maxLength={10}
          value={displayValue}
          onChange={handleChange}
          onBlur={() => setTouched(true)}
          disabled={disabled}
          placeholder={placeholder}
          className={`block w-full min-w-0 flex-1 rounded-none rounded-r-lg border text-[13px] px-3 py-2 transition-colors focus:outline-none focus:ring-2 focus:ring-primary/20 ${
            displayError
              ? 'border-red-500 text-red-900 focus:border-red-500 focus:ring-red-200'
              : 'border-gray-300 focus:border-primary text-gray-900'
          } ${disabled ? 'bg-gray-100 cursor-not-allowed text-gray-500' : 'bg-white'}`}
        />
      </div>
      {displayError && (
        <p className="text-[11px] font-medium text-red-500 mt-1 flex items-center gap-1">
          <span>⚠️</span> {displayError}
        </p>
      )}
    </div>
  );
};

interface PincodeInputProps extends Omit<React.InputHTMLAttributes<HTMLInputElement>, 'onChange'> {
  value?: string;
  onChange: (val: string) => void;
  label?: string;
  error?: string;
  required?: boolean;
  className?: string;
}

export const PincodeInput: React.FC<PincodeInputProps> = ({
  value,
  onChange,
  label,
  error: customError,
  required = false,
  className = '',
  placeholder = '6-digit PIN code (e.g. 560001)',
  disabled,
  ...props
}) => {
  const [touched, setTouched] = useState(false);

  const handleChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    let raw = e.target.value.replace(/\D/g, '');
    if (raw.length > 6) raw = raw.slice(0, 6);
    onChange(raw);
  };

  const validationError = touched && required && !value ? 'PIN code is required' : (touched && value && value.length !== 6 ? 'PIN code must be exactly 6 digits' : null);
  const displayError = customError || validationError;

  return (
    <div className={`space-y-1 ${className}`}>
      {label && (
        <label className="block text-[13px] font-medium text-gray-700">
          {label} {required && <span className="text-red-500">*</span>}
        </label>
      )}
      <input
        {...props}
        type="text"
        inputMode="numeric"
        maxLength={6}
        value={value || ''}
        onChange={handleChange}
        onBlur={() => setTouched(true)}
        disabled={disabled}
        placeholder={placeholder}
        className={`block w-full rounded-lg border text-[13px] px-3 py-2 transition-colors focus:outline-none focus:ring-2 focus:ring-primary/20 ${
          displayError
            ? 'border-red-500 text-red-900 focus:border-red-500 focus:ring-red-200'
            : 'border-gray-300 focus:border-primary text-gray-900'
        } ${disabled ? 'bg-gray-100 cursor-not-allowed text-gray-500' : 'bg-white'}`}
      />
      {displayError && (
        <p className="text-[11px] font-medium text-red-500 mt-1 flex items-center gap-1">
          <span>⚠️</span> {displayError}
        </p>
      )}
    </div>
  );
};