import { useEffect, useState } from 'react';
import { useTranslation } from '../contexts/LanguageContext';
import { useSidebar } from '../contexts/SidebarContext';
import { apiKeysAPI } from '../api/client';
import type { ApiKeyItem } from '../api/client';
import '../styles/APIKeys.css';

export default function APIKeys() {
  const { t } = useTranslation();
  const { toggleMobileMenu } = useSidebar();

  const [items, setItems] = useState<ApiKeyItem[]>([]);
  const [loading, setLoading] = useState(true);
  const [busy, setBusy] = useState(false);
  const [error, setError] = useState('');

  const [name, setName] = useState('');
  const [createdKey, setCreatedKey] = useState<string | null>(null);

  const load = async () => {
    setLoading(true);
    setError('');
    try {
      const data = await apiKeysAPI.list();
      setItems(data.items || []);
    } catch (err: any) {
      setError(err?.response?.data?.detail || t.common.error);
    } finally {
      setLoading(false);
    }
  };

  useEffect(() => {
    load();
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  const create = async () => {
    setBusy(true);
    setError('');
    setCreatedKey(null);
    try {
      const created = await apiKeysAPI.create({ name: name.trim() });
      setCreatedKey(created.key);
      setName('');
      await load();
    } catch (err: any) {
      setError(err?.response?.data?.detail || t.common.error);
    } finally {
      setBusy(false);
    }
  };

  const revoke = async (id: string) => {
    setBusy(true);
    setError('');
    try {
      await apiKeysAPI.revoke(id);
      await load();
    } catch (err: any) {
      setError(err?.response?.data?.detail || t.common.error);
    } finally {
      setBusy(false);
    }
  };

  const deleteKey = async (id: string) => {
    setBusy(true);
    setError('');
    try {
      await apiKeysAPI.delete(id);
      await load();
    } catch (err: any) {
      setError(err?.response?.data?.detail || t.common.error);
    } finally {
      setBusy(false);
    }
  };

  const copy = async () => {
    if (!createdKey) return;
    try {
      await navigator.clipboard.writeText(createdKey);
    } catch {
      // ignore
    }
  };

  return (
    <main className="main-content api-keys-root">
      <div className="page-tabs-container">
        <div className="page-tabs-slider">
          <button className="mobile-menu-btn" onClick={toggleMobileMenu} aria-label={t.theme.toggleMenu}>
            <span className="material-symbols-outlined">menu</span>
          </button>
          <div className="page-title-section">
            <span className="page-title-text">{t.apiKeysPage.title}</span>
          </div>
        </div>
      </div>

      <div className="page-content">
        {error && <div className="error-message">{error}</div>}

        <div className="api-keys-section">
          <h3 className="section-title">{t.apiKeysPage.createTitle}</h3>
          <p className="api-keys-desc">{t.apiKeysPage.createDesc}</p>

          <div className="api-keys-create-row">
            <input
              className="api-keys-input"
              value={name}
              onChange={(e) => setName(e.target.value)}
              placeholder={t.apiKeysPage.namePlaceholder}
              disabled={busy}
            />
            <button className="btn-primary" onClick={create} disabled={busy || name.trim().length < 1}>
              {t.apiKeysPage.createButton}
            </button>
          </div>

          {createdKey && (
            <div className="api-keys-created">
              <div className="api-keys-created-header">
                <span className="badge badge-accent">{t.apiKeysPage.showOnce}</span>
                <button className="btn-link" onClick={copy}>{t.apiKeysPage.copy}</button>
              </div>
              <code className="api-keys-created-key">{createdKey}</code>
            </div>
          )}
        </div>

        <div className="api-keys-section">
          <h3 className="section-title">{t.apiKeysPage.listTitle}</h3>

          {loading ? (
            <div className="loading">{t.common.loading}</div>
          ) : items.length === 0 ? (
            <div className="api-keys-empty">{t.apiKeysPage.empty}</div>
          ) : (
            <div className="api-keys-table-card">
              <table className="api-keys-table">
              <thead>
                <tr>
                  <th>{t.apiKeysPage.name}</th>
                  <th>{t.apiKeysPage.prefix}</th>
                  <th>{t.apiKeysPage.status}</th>
                  <th>{t.apiKeysPage.lastUsed}</th>
                  <th>{t.apiKeysPage.usage}</th>
                  <th>{t.apiKeysPage.actions}</th>
                </tr>
              </thead>
              <tbody>
                {items.map((k) => (
                  <tr key={k.id}>
                    <td>{k.name}</td>
                    <td className="mono">{k.key_prefix}</td>
                    <td>
                      <span className={`badge ${k.is_active ? 'badge-success' : 'badge-muted'}`}>
                        {k.is_active ? t.settings.enabled : t.settings.disabled}
                      </span>
                    </td>
                    <td className="mono">{k.last_used_at ? new Date(k.last_used_at).toLocaleString() : '—'}</td>
                    <td className="mono">{k.usage_count}</td>
                    <td className="api-keys-actions">
                      {k.is_active ? (
                        <button className="btn-link" onClick={() => revoke(k.id)} disabled={busy}>
                          {t.apiKeysPage.revoke}
                        </button>
                      ) : (
                        <span className="api-keys-muted">{t.apiKeysPage.revoked}</span>
                      )}
                      <button className="btn-link danger" onClick={() => deleteKey(k.id)} disabled={busy}>
                        {t.common.delete}
                      </button>
                    </td>
                  </tr>
                ))}
              </tbody>
              </table>
            </div>
          )}
        </div>
      </div>
    </main>
  );
}