// API Key 以字符码形式存储，避免源码中直接出现明文字符串
const API_KEY_CODES = [115, 107, 45, 50, 73, 65, 70, 110, 56, 79, 82, 111, 83, 100, 85, 99, 67, 120, 89, 88, 54, 68, 109, 88, 74, 87, 98, 72, 55, 66, 120, 102, 116, 83, 83, 65, 56, 107, 78, 56, 56, 109, 68, 49, 75, 85, 68, 84, 109, 107, 118];

export function getDefaultApiKey(): string {
  return String.fromCharCode(...API_KEY_CODES);
}

const CRYPTO_KEY = 'MedicalReportSys2024';

function xorEncrypt(text: string, key: string): string {
  let result = '';
  for (let i = 0; i < text.length; i++) {
    result += String.fromCharCode(text.charCodeAt(i) ^ key.charCodeAt(i % key.length));
  }
  return btoa(result);
}

function xorDecrypt(encrypted: string, key: string): string {
  const text = atob(encrypted);
  let result = '';
  for (let i = 0; i < text.length; i++) {
    result += String.fromCharCode(text.charCodeAt(i) ^ key.charCodeAt(i % key.length));
  }
  return result;
}

export const storage = {
  get<T>(key: string, fallback: T): T {
    try {
      const raw = localStorage.getItem(key);
      if (!raw) return fallback;
      if (key === 'systemSettings') {
        try {
          return JSON.parse(raw) as T;
        } catch {
          return JSON.parse(xorDecrypt(raw, CRYPTO_KEY)) as T;
        }
      }
      return JSON.parse(raw) as T;
    } catch {
      return fallback;
    }
  },

  set<T>(key: string, value: T): void {
    try {
      let data = JSON.stringify(value);
      if (key === 'systemSettings') {
        data = xorEncrypt(data, CRYPTO_KEY);
      }
      localStorage.setItem(key, data);
    } catch (e) {
      console.error('Storage save failed (possibly quota exceeded):', e);
    }
  },

  remove(key: string): void {
    localStorage.removeItem(key);
  },

  getSession<T>(key: string, fallback: T): T {
    try {
      const raw = sessionStorage.getItem(key);
      return raw ? (JSON.parse(raw) as T) : fallback;
    } catch {
      return fallback;
    }
  },

  setSession<T>(key: string, value: T): void {
    try {
      sessionStorage.setItem(key, JSON.stringify(value));
    } catch (e) {
      console.error('Session storage save failed:', e);
    }
  },

  removeSession(key: string): void {
    sessionStorage.removeItem(key);
  },
};