'use client';

import * as React from 'react';
import { NumericFormat, type NumericFormatProps } from 'react-number-format';

import { Input } from '@/components/ui/input';
import { cn } from '@/lib/utils';
import { currencySymbol } from '@/lib/utils/currency';

interface CurrencyInputProps extends Omit<
  NumericFormatProps,
  'value' | 'onChange' | 'customInput'
> {
  /** Controlled raw numeric value. `null` / `undefined` render empty. */
  value: number | string | null | undefined;
  /** Fires with a raw number (or `null` if cleared). */
  onChange: (value: number | null) => void;
  /** ISO currency code; renders as a leading symbol prefix. */
  currency?: string;
  className?: string;
}

/**
 * Numeric input pre-decorated with a currency symbol and thousand-separator
 * grouping (e.g. `3,528,000.50`). Built on react-number-format which handles
 * the inputMode/IME edge cases, decimal/group localisation, paste sanitization,
 * and selection caret preservation that hand-rolled parsers miss.
 *
 * Renders inside the shared `<Input>` shell via `customInput` so border /
 * focus-ring / dark-mode styles stay consistent with the rest of the kit.
 */
export const CurrencyInput = React.forwardRef<HTMLInputElement, CurrencyInputProps>(
  ({ value, onChange, currency = 'USD', className, ...props }, ref) => {
    const symbol = currencySymbol(currency);

    // react-number-format wants undefined (not null) to render empty.
    const formatValue =
      value === null || value === undefined || value === '' ? undefined : Number(value);

    return (
      <div className="relative">
        <span
          className="pointer-events-none absolute left-3 top-1/2 -translate-y-1/2 text-sm text-muted-foreground"
          aria-hidden
        >
          {symbol}
        </span>
        <NumericFormat
          getInputRef={ref}
          customInput={Input}
          value={formatValue}
          thousandSeparator=","
          decimalSeparator="."
          decimalScale={2}
          allowNegative
          inputMode="decimal"
          autoComplete="off"
          onValueChange={(values) => {
            // floatValue is undefined when input is empty.
            onChange(values.floatValue ?? null);
          }}
          className={cn('pl-9 tabular-nums', className)}
          {...props}
        />
      </div>
    );
  },
);
CurrencyInput.displayName = 'CurrencyInput';