localgreenchain/components/marketplace/OfferForm.tsx

import { useState } from 'react';

interface OfferFormProps {
  listingId: string;
  askingPrice: number;
  currency?: string;
  onSubmit: (amount: number, message: string) => Promise<void>;
  onCancel?: () => void;
}

export function OfferForm({
  listingId,
  askingPrice,
  currency = 'USD',
  onSubmit,
  onCancel,
}: OfferFormProps) {
  const [amount, setAmount] = useState(askingPrice.toString());
  const [message, setMessage] = useState('');
  const [submitting, setSubmitting] = useState(false);
  const [error, setError] = useState('');

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setError('');

    const offerAmount = parseFloat(amount);

    if (isNaN(offerAmount) || offerAmount <= 0) {
      setError('Please enter a valid offer amount');
      return;
    }

    setSubmitting(true);
    try {
      await onSubmit(offerAmount, message);
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to submit offer');
    } finally {
      setSubmitting(false);
    }
  };

  const suggestedOffers = [
    { label: 'Full Price', value: askingPrice },
    { label: '10% Off', value: Math.round(askingPrice * 0.9 * 100) / 100 },
    { label: '15% Off', value: Math.round(askingPrice * 0.85 * 100) / 100 },
  ];

  return (
    <form onSubmit={handleSubmit} className="space-y-4">
      {error && (
        <div className="p-3 bg-red-50 border border-red-200 rounded-lg text-red-700 text-sm">
          {error}
        </div>
      )}

      {/* Suggested Offers */}
      <div>
        <label className="block text-sm font-medium text-gray-700 mb-2">
          Quick Select
        </label>
        <div className="flex gap-2">
          {suggestedOffers.map((suggestion) => (
            <button
              key={suggestion.label}
              type="button"
              onClick={() => setAmount(suggestion.value.toString())}
              className={`px-3 py-2 rounded-lg text-sm transition ${
                parseFloat(amount) === suggestion.value
                  ? 'bg-green-600 text-white'
                  : 'bg-gray-100 text-gray-700 hover:bg-gray-200'
              }`}
            >
              {suggestion.label}
              <br />
              <span className="font-semibold">${suggestion.value.toFixed(2)}</span>
            </button>
          ))}
        </div>
      </div>

      {/* Custom Amount */}
      <div>
        <label htmlFor="offerAmount" className="block text-sm font-medium text-gray-700 mb-1">
          Your Offer ({currency})
        </label>
        <div className="relative">
          <span className="absolute left-4 top-1/2 -translate-y-1/2 text-gray-500">$</span>
          <input
            type="number"
            id="offerAmount"
            value={amount}
            onChange={(e) => setAmount(e.target.value)}
            required
            min="0.01"
            step="0.01"
            className="w-full pl-8 pr-4 py-3 border border-gray-300 rounded-lg focus:ring-2 focus:ring-green-500 focus:border-transparent"
          />
        </div>
        <p className="mt-1 text-sm text-gray-500">
          Asking price: ${askingPrice.toFixed(2)}
        </p>
      </div>

      {/* Message */}
      <div>
        <label htmlFor="offerMessage" className="block text-sm font-medium text-gray-700 mb-1">
          Message to Seller (optional)
        </label>
        <textarea
          id="offerMessage"
          value={message}
          onChange={(e) => setMessage(e.target.value)}
          rows={3}
          placeholder="Introduce yourself or ask a question..."
          className="w-full px-4 py-3 border border-gray-300 rounded-lg focus:ring-2 focus:ring-green-500 focus:border-transparent"
        />
      </div>

      {/* Actions */}
      <div className="flex gap-3 pt-2">
        {onCancel && (
          <button
            type="button"
            onClick={onCancel}
            className="flex-1 py-3 border border-gray-300 text-gray-700 rounded-lg hover:bg-gray-50 transition"
          >
            Cancel
          </button>
        )}
        <button
          type="submit"
          disabled={submitting}
          className="flex-1 py-3 bg-green-600 text-white font-semibold rounded-lg hover:bg-green-700 transition disabled:opacity-50"
        >
          {submitting ? 'Submitting...' : 'Submit Offer'}
        </button>
      </div>
    </form>
  );
}

export default OfferForm;