import { useState } from 'react';
import apiClient from '../api/client';

export default function TestSmsModal({ businessId, template, onClose }) {
  const [toNumber, setToNumber] = useState('');
  const [sending, setSending] = useState(false);
  const [result, setResult] = useState(null);
  const [error, setError] = useState('');

  async function handleSend(e) {
    e.preventDefault();
    if (!toNumber.trim()) return;
    setSending(true);
    setError('');
    setResult(null);
    try {
      const res = await apiClient.post(
        `/api/businesses/${businessId}/templates/${template.eventSlug}/test`,
        { toNumber: toNumber.trim() }
      );
      setResult(res.data);
    } catch (err) {
      setError(err.response?.data?.error || err.response?.data?.details || 'Failed to send test SMS');
    } finally {
      setSending(false);
    }
  }

  return (
    <div className="fixed inset-0 z-50 flex items-center justify-center bg-gray-900/50 backdrop-blur-sm">
      <div className="bg-white border border-gray-200 rounded-lg p-5 w-full max-w-md ">
        <div className="w-12 h-12 rounded-full bg-white flex items-center justify-center mx-auto mb-4">
          <span className="text-xl">📱</span>
        </div>
        <h3 className="text-lg font-bold text-gray-800 text-center mb-1">Test SMS</h3>
        <p className="text-sm text-gray-500 text-center mb-6">
          Enter a phone number to send a real test SMS for <span className="font-semibold text-gray-800 capitalize">{template.eventLabel || template.eventSlug.replace(/_/g, ' ')}</span>
        </p>

        {!result ? (
          <form onSubmit={handleSend} className="space-y-4">
            {error && (
              <div className="px-4 py-2 rounded-md bg-white border border-gray-200 text-gray-700 text-sm font-medium">
                {error}
              </div>
            )}

            <div>
              <label className="block text-sm font-semibold text-gray-700 mb-1.5">Phone Number</label>
              <input
                type="tel"
                value={toNumber}
                onChange={e => setToNumber(e.target.value)}
                placeholder="e.g. 919876543210 (with country code)"
                className="w-full px-4 py-2 rounded-lg bg-white border border-gray-300 font-mono text-gray-800 placeholder-gray-400 focus:outline-none focus:ring-2 focus:ring-primary-blue text-sm"
                autoFocus
                required
              />
              <p className="text-xs text-gray-400 mt-1.5 font-medium">Include country code without +. Not stored.</p>
            </div>

            <div className="flex gap-3 pt-2">
              <button
                type="button"
                onClick={onClose}
                disabled={sending}
                className="flex-1 py-2 rounded-lg border border-gray-300 text-gray-700 hover:bg-gray-50 text-sm font-medium transition disabled:opacity-50"
              >
                Cancel
              </button>
              <button
                type="submit"
                disabled={sending || !toNumber.trim()}
                className="flex-1 py-2 rounded-lg bg-green-600 hover:bg-green-700 text-white text-sm font-semibold transition  disabled:opacity-50 flex items-center justify-center gap-2"
              >
                {sending ? <><span className="w-4 h-4 border-2 border-white/30 border-t-white rounded-full animate-spin" /> Sending…</> : 'Send Test SMS'}
              </button>
            </div>
          </form>
        ) : (
          <div className="space-y-4">
            <div className={`px-4 py-2 rounded-lg border text-sm font-medium ${result.success ? 'bg-white border-gray-200 text-green-800' : 'bg-white border-gray-200 text-red-800'}`}>
              {result.success ? '✓ SMS sent successfully!' : '✗ SMS send failed'}
              {result.statusCode && <span className="ml-2 opacity-60">HTTP {result.statusCode}</span>}
            </div>
            {result.renderedContent && (
              <div>
                <label className="block text-xs font-bold text-gray-500 uppercase tracking-wider mb-2">Rendered SMS Content</label>
                <pre className="p-3 bg-white border border-gray-200 rounded-lg text-xs font-mono text-gray-700 overflow-x-auto whitespace-pre-wrap break-words">
                  {result.renderedContent}
                </pre>
                {Array.isArray(result.renderState?.fallbackPlaceholders) && result.renderState.fallbackPlaceholders.length > 0 && (
                  <p className="mt-2 text-xs font-medium text-gray-500">
                    {result.renderState.fallbackPlaceholders.length} placeholder{result.renderState.fallbackPlaceholders.length === 1 ? '' : 's'} used deterministic sample fallback values.
                  </p>
                )}
              </div>
            )}
            {result.response && (
              <div>
                <label className="block text-xs font-bold text-gray-500 uppercase tracking-wider mb-2">Provider Response</label>
                <pre className="p-3 bg-white border border-gray-200 rounded-lg text-xs font-mono text-gray-700 overflow-x-auto whitespace-pre-wrap break-all">
                  {typeof result.response === 'string' ? result.response : JSON.stringify(result.response, null, 2)}
                </pre>
              </div>
            )}
            <button
              onClick={onClose}
              className="w-full py-2 rounded-lg bg-gray-900 hover:bg-gray-800 text-white text-sm font-semibold transition"
            >
              Close
            </button>
          </div>
        )}
      </div>
    </div>
  );
}