import { useState, useEffect } from 'react';
import { useParams, useNavigate } from 'react-router-dom';
import type { RequestLog } from '../../types/monitoring';
import { getLogDetail } from '../../services/monitoringService';

const METHOD_COLOR: Record<string, string> = {
  GET: 'bg-green-100 text-green-800',
  POST: 'bg-blue-100 text-blue-800',
  PUT: 'bg-orange-100 text-orange-800',
  DELETE: 'bg-red-100 text-red-800',
};

const STATUS_BADGE: Record<string, string> = {
  SUCCESS: 'bg-green-100 text-green-800',
  DENIED: 'bg-red-100 text-red-800',
  EXPIRED: 'bg-orange-100 text-orange-800',
  INVALID_KEY: 'bg-red-100 text-red-800',
  FAILED: 'bg-gray-100 text-gray-800',
};

const formatDateTime = (dateStr: string): string => {
  const d = new Date(dateStr);
  const year = d.getFullYear();
  const month = String(d.getMonth() + 1).padStart(2, '0');
  const day = String(d.getDate()).padStart(2, '0');
  const hours = String(d.getHours()).padStart(2, '0');
  const minutes = String(d.getMinutes()).padStart(2, '0');
  const seconds = String(d.getSeconds()).padStart(2, '0');
  return `${year}-${month}-${day} ${hours}:${minutes}:${seconds}`;
};

const formatJson = (str: string | null): string | null => {
  if (!str) return null;
  try {
    return JSON.stringify(JSON.parse(str), null, 2);
  } catch {
    return str;
  }
};

const RequestLogDetailPage = () => {
  const { id } = useParams<{ id: string }>();
  const navigate = useNavigate();

  const [log, setLog] = useState<RequestLog | null>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    if (!id) return;

    const fetchDetail = async () => {
      setLoading(true);
      setError(null);
      try {
        const res = await getLogDetail(Number(id));
        if (res.success && res.data) {
          setLog(res.data);
        } else {
          setError(res.message || '로그 상세 조회에 실패했습니다.');
        }
      } catch {
        setError('로그 상세 조회에 실패했습니다.');
      } finally {
        setLoading(false);
      }
    };

    fetchDetail();
  }, [id]);

  if (loading) {
    return <div className="text-center py-10 text-gray-500">로딩 중...</div>;
  }

  if (error) {
    return (
      <div>
        <button
          onClick={() => navigate(-1)}
          className="text-blue-600 hover:text-blue-800 font-medium mb-4"
        >
          &larr; 목록으로
        </button>
        <div className="p-3 bg-red-50 text-red-700 rounded-lg text-sm">{error}</div>
      </div>
    );
  }

  if (!log) return null;

  const formattedHeaders = formatJson(log.requestHeaders);
  const formattedParams = formatJson(log.requestParams);

  return (
    <div>
      <button
        onClick={() => navigate(-1)}
        className="text-blue-600 hover:text-blue-800 font-medium mb-6"
      >
        &larr; 목록으로
      </button>

      {/* 기본 정보 */}
      <div className="bg-white rounded-lg shadow p-6 mb-6">
        <h2 className="text-lg font-semibold text-gray-900 mb-4">기본 정보</h2>
        <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4 mb-4">
          <div>
            <span className="block text-sm font-medium text-gray-500">요청 시간</span>
            <span className="text-sm text-gray-900">{formatDateTime(log.requestedAt)}</span>
          </div>
          <div>
            <span className="block text-sm font-medium text-gray-500">요청</span>
            <span className="text-sm text-gray-900">
              <span
                className={`inline-block px-2 py-0.5 rounded text-xs font-bold mr-2 ${
                  METHOD_COLOR[log.requestMethod] || 'bg-gray-100 text-gray-800'
                }`}
              >
                {log.requestMethod}
              </span>
              {log.requestUrl}
            </span>
          </div>
          <div>
            <span className="block text-sm font-medium text-gray-500">응답 코드</span>
            <span className="text-sm text-gray-900">
              {log.responseStatus != null ? log.responseStatus : '-'}
            </span>
          </div>
          <div>
            <span className="block text-sm font-medium text-gray-500">응답시간(ms)</span>
            <span className="text-sm text-gray-900">
              {log.responseTime != null ? log.responseTime : '-'}
            </span>
          </div>
          <div>
            <span className="block text-sm font-medium text-gray-500">응답크기(bytes)</span>
            <span className="text-sm text-gray-900">
              {log.responseSize != null ? log.responseSize : '-'}
            </span>
          </div>
          <div>
            <span className="block text-sm font-medium text-gray-500">상태</span>
            <span
              className={`inline-block px-2 py-0.5 rounded-full text-xs font-medium ${
                STATUS_BADGE[log.requestStatus] || 'bg-gray-100 text-gray-800'
              }`}
            >
              {log.requestStatus}
            </span>
          </div>
        </div>
        <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-4">
          <div>
            <span className="block text-sm font-medium text-gray-500">서비스</span>
            <span className="text-sm text-gray-900">{log.serviceName || '-'}</span>
          </div>
          <div>
            <span className="block text-sm font-medium text-gray-500">API Key</span>
            <span className="text-sm text-gray-900 font-mono">
              {log.apiKeyPrefix || '-'}
            </span>
          </div>
          <div>
            <span className="block text-sm font-medium text-gray-500">사용자</span>
            <span className="text-sm text-gray-900">{log.userName || '-'}</span>
          </div>
          <div>
            <span className="block text-sm font-medium text-gray-500">IP</span>
            <span className="text-sm text-gray-900 font-mono">{log.requestIp}</span>
          </div>
        </div>
      </div>

      {/* 요청 정보 */}
      {(formattedHeaders || formattedParams) && (
        <div className="bg-white rounded-lg shadow p-6 mb-6">
          <h2 className="text-lg font-semibold text-gray-900 mb-4">요청 정보</h2>
          {formattedHeaders && (
            <div className="mb-4">
              <span className="block text-sm font-medium text-gray-500 mb-1">Request Headers</span>
              <pre className="bg-gray-50 rounded-lg p-4 text-sm text-gray-800 overflow-x-auto">
                {formattedHeaders}
              </pre>
            </div>
          )}
          {formattedParams && (
            <div>
              <span className="block text-sm font-medium text-gray-500 mb-1">Request Params</span>
              <pre className="bg-gray-50 rounded-lg p-4 text-sm text-gray-800 overflow-x-auto">
                {formattedParams}
              </pre>
            </div>
          )}
        </div>
      )}

      {/* 에러 정보 */}
      {log.errorMessage && (
        <div className="bg-red-50 rounded-lg shadow p-6">
          <h2 className="text-lg font-semibold text-red-900 mb-2">에러 정보</h2>
          <p className="text-sm text-red-800">{log.errorMessage}</p>
        </div>
      )}
    </div>
  );
};

export default RequestLogDetailPage;
