'use client';

import * as React from 'react';

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

interface CurrencyInputProps extends Omit<
  React.ComponentProps<'input'>,
  'value' | 'onChange' | 'type'
> {
  /** 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. The display
 * value is the raw number the user typed (we don't fight the keystroke
 * cadence by re-formatting on every key) — formatted display lives in
 * read-only contexts via `formatCurrency()`. This keeps form behaviour
 * predictable while still scoping the input to a money field via the
 * symbol prefix and the `decimal` inputMode.
 */
export const CurrencyInput = React.forwardRef<HTMLInputElement, CurrencyInputProps>(
  ({ value, onChange, currency = 'USD', className, ...props }, ref) => {
    const symbol = currencySymbol(currency);

    const display = value === null || value === undefined || value === '' ? '' : String(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>
        <Input
          ref={ref}
          type="number"
          inputMode="decimal"
          step="0.01"
          min="0"
          value={display}
          onChange={(e) => {
            const raw = e.target.value;
            if (raw === '') {
              onChange(null);
              return;
            }
            const n = Number(raw);
            onChange(Number.isFinite(n) ? n : null);
          }}
          className={cn('pl-9 tabular-nums', className)}
          {...props}
        />
      </div>
    );
  },
);
CurrencyInput.displayName = 'CurrencyInput';