import { useState, useEffect } from 'react';
import { X, Send } from 'lucide-react';
import type { Settings } from '../types';
import { updateSettings, testTelegram } from '../api/client';

interface Props {
  settings: Settings | null;
  onClose: () => void;
  onSaved: (s: Settings) => void;
}

export default function SettingsModal({ settings, onClose, onSaved }: Props) {
  const [token,  setToken]  = useState('');
  const [chatId, setChatId] = useState('');
  const [saving,  setSaving]  = useState(false);
  const [testing, setTesting] = useState(false);
  const [error,   setError]   = useState('');
  const [testMsg, setTestMsg] = useState('');

  useEffect(() => {
    if (settings) {
      setToken(settings.telegram_bot_token ?? '');
      setChatId(settings.telegram_chat_id ?? '');
    }
  }, [settings]);

  const handleSave = async (e: React.FormEvent) => {
    e.preventDefault();
    setError('');
    setTestMsg('');
    setSaving(true);
    try {
      const updated = await updateSettings({
        telegram_bot_token: token.trim(),
        telegram_chat_id:   chatId.trim(),
      });
      onSaved(updated);
    } catch (e: unknown) {
      setError(e instanceof Error ? e.message : 'Failed to save settings');
    } finally {
      setSaving(false);
    }
  };

  const handleTest = async () => {
    setTestMsg('');
    setError('');
    setTesting(true);
    try {
      // Save first so the test uses current values
      await updateSettings({
        telegram_bot_token: token.trim(),
        telegram_chat_id:   chatId.trim(),
      });
      const result = await testTelegram();
      if (result.success) {
        setTestMsg('✓ Test message sent! Check your Telegram.');
      } else {
        setError(result.error ?? 'Test failed — check your token and chat ID.');
      }
    } catch (e: unknown) {
      setError(e instanceof Error ? e.message : 'Test failed');
    } finally {
      setTesting(false);
    }
  };

  return (
    <div className="modal-backdrop" onClick={e => e.target === e.currentTarget && onClose()}>
      <div className="modal" role="dialog" aria-modal="true" aria-labelledby="settings-title">
        <div className="modal-header">
          <div>
            <div className="modal-title" id="settings-title">Telegram Settings</div>
            <div className="modal-subtitle">Configure your alert notifications</div>
          </div>
          <button className="modal-close" onClick={onClose} aria-label="Close">
            <X size={18} />
          </button>
        </div>

        <div className="info-box">
          <strong>Getting your Chat ID</strong><br />
          Your Telegram <em>username</em> (@ALWISPER) can't be used directly — you need your numeric
          chat ID. The easiest way: message{' '}
          <strong>@userinfobot</strong> on Telegram and it will reply with your numeric ID.
          Then paste it below.
        </div>

        {error   && <div className="form-error">{error}</div>}
        {testMsg && <div className="success-box">{testMsg}</div>}

        <form onSubmit={handleSave}>
          <div className="form-group">
            <label className="form-label" htmlFor="tg-token">Bot Token</label>
            <input
              id="tg-token"
              className="form-input"
              type="text"
              placeholder="1234567890:AABBCCDDEEFFaabbccddeeff..."
              value={token}
              onChange={e => setToken(e.target.value)}
              autoComplete="off"
              spellCheck={false}
            />
            <div className="form-hint">
              From <strong>@BotFather</strong> → your bot → API Token.
            </div>
          </div>

          <div className="form-group">
            <label className="form-label" htmlFor="tg-chatid">Chat ID (numeric)</label>
            <input
              id="tg-chatid"
              className="form-input"
              type="text"
              placeholder="123456789"
              value={chatId}
              onChange={e => setChatId(e.target.value)}
              autoComplete="off"
              spellCheck={false}
            />
            <div className="form-hint">
              Message <strong>@userinfobot</strong> to get your numeric ID.
            </div>
          </div>

          <div className="form-actions">
            <button
              type="button"
              className="btn-secondary"
              disabled={testing || saving || !token || !chatId}
              onClick={handleTest}
            >
              {testing
                ? <><div className="spinner" style={{ width: 13, height: 13 }} /> Sending…</>
                : <><Send size={13} /> Test Alert</>
              }
            </button>
            <button type="button" className="btn-secondary" onClick={onClose} disabled={saving}>
              Cancel
            </button>
            <button type="submit" className="btn-primary" disabled={saving}>
              {saving ? <><div className="spinner" style={{ width: 14, height: 14 }} /> Saving…</> : 'Save'}
            </button>
          </div>
        </form>
      </div>
    </div>
  );
}