/**
 * 配置项定义
 * @typedef {Object} SettingDefinition
 * @property {string} type - 配置项类型 ('boolean' | 'number' | 'string')
 * @property {any} default - 默认值
 * @property {Function} [validate] - 可选的验证函数
 * @property {string} [description] - 配置项描述
 * @property {string} [legacyKey] - 旧版本localStorage键名(用于迁移)
 * @property {boolean} [requireDeveloper] - 是否需要开发者选项启用
 */

// 存储所有设置的localStorage键名
const SETTINGS_STORAGE_KEY = "classworks_settings";

/**
 * 所有配置项的定义
 * @type {Object.<string, SettingDefinition>}
 */
const settingsDefinitions = {
  // 显示设置
  "display.emptySubjectDisplay": {
    type: "string",
    default: "button", // 修改默认值为 'button'
    validate: (value) => ["card", "button"].includes(value),
    description: "空科目的显示方式：卡片或按钮",
  },
  "display.dynamicSort": {
    type: "boolean",
    default: true,
    description: "是否启用动态排序以优化显示效果",
  },
  "display.showRandomButton": {
    type: "boolean",
    default: false,
    description: "是否显示随机按钮",
  },

  // 服务器设置（合并了数据提供者设置）
  "server.domain": {
    type: "string",
    default: "",
    validate: (value) => !value || /^https?:\/\//.test(value),
    description: "后端服务器域名",
  },
  "server.classNumber": {
    type: "string",
    default: "",
    validate: (value) => /^[A-Za-z0-9]*$/.test(value),
    description: "班级编号(无论使用哪种存储方式都需要设置)",
  },
  "server.provider": {
    type: "string",
    default: "indexedDB",
    validate: (value) =>
      ["server", "localStorage", "indexedDB"].includes(value),
    description: "数据提供者，用于决定数据存储方式",
  },

  // 刷新设置
  "refresh.auto": {
    type: "boolean",
    default: false,
    description: "是否启用自动刷新",
  },
  "refresh.interval": {
    type: "number",
    default: 300,
    validate: (value) => value >= 10 && value <= 3600,
    description: "自动刷新间隔（秒）",
  },

  // 字体设置
  "font.size": {
    type: "number",
    default: 28,
    validate: (value) => value >= 16 && value <= 100,
    description: "字体大小（像素）",
  },

  // 编辑设置
  "edit.autoSave": {
    type: "boolean",
    default: true,
    description: "是否启用自动保存",
  },
  "edit.blockNonTodayAutoSave": {  // 添加新选项
    type: "boolean",
    default: true,
    description: "禁止自动保存非当天数据",
  },
  "edit.refreshBeforeEdit": {
    type: "boolean",
    default: true,
    description: "编辑前是否自动刷新",
  },
  "edit.confirmNonTodaySave": {  // 添加新选项
    type: "boolean",
    default: true,
    description: "保存非当天数据时显示确认对话框，禁用则允许直接保存",
  },

  // 开发者选项
  "developer.enabled": {
    type: "boolean",
    default: false,
    description: "是否启用开发者选项",
  },
  "developer.showDebugConfig": {
    type: "boolean",
    default: false,
    description: "是否显示调试配置",
  },
  "developer.disableMessageLog": {  // 添加新的设置项
    type: "boolean",
    default: false,
    description: "禁用消息日志记录",
    requireDeveloper: true,
  },

  // 消息设置
  "message.showSidebar": {
    type: "boolean",
    default: true,
    description: "是否显示消息记录侧栏",
    requireDeveloper: true, // 添加标记
  },
  "message.maxActiveMessages": {
    type: "number",
    default: 5,
    validate: (value) => value >= 1 && value <= 10,
    description: "同时显示的最大消息数量",
    requireDeveloper: true,
  },
  "message.timeout": {
    type: "number",
    default: 5000,
    validate: (value) => value >= 1000 && value <= 30000,
    description: "消息自动关闭时间(毫秒)",
    requireDeveloper: true,
  },
  "message.saveHistory": {
    type: "boolean",
    default: true,
    description: "是否保存消息历史记录",
    requireDeveloper: true,
  },
};

// 内存中缓存的设置值
let settingsCache = null;

/**
 * 从localStorage加载所有设置
 * @returns {Object} 所有设置的值
 */
function loadSettings() {
  try {
    const stored = localStorage.getItem(SETTINGS_STORAGE_KEY);
    if (stored) {
      settingsCache = JSON.parse(stored);
    } else {
      // 首次使用或迁移旧数据
      settingsCache = migrateFromLegacy();
    }
  } catch (error) {
    console.error("加载设置失败:", error);
    settingsCache = {};
  }

  // 确保所有设置项都有值（使用默认值填充）
  for (const [key, definition] of Object.entries(settingsDefinitions)) {
    if (!(key in settingsCache)) {
      settingsCache[key] = definition.default;
    }
  }

  return settingsCache;
}

/**
 * 从旧版本的localStorage迁移数据
 */
function migrateFromLegacy() {
  const LEGACY_SETTINGS_KEY = "homeworkpage_settings";
  const LEGACY_MESSAGE_KEY = "homeworkpage_messages";

  // 尝试从旧版本的设置中迁移
  const legacySettings = localStorage.getItem(LEGACY_SETTINGS_KEY);
  if (legacySettings) {
    try {
      const settings = JSON.parse(legacySettings);
      localStorage.setItem(SETTINGS_STORAGE_KEY, JSON.stringify(settings));
      // 可选：删除旧的设置
      localStorage.removeItem(LEGACY_SETTINGS_KEY);
      return settings;
    } catch (error) {
      console.error("迁移旧设置失败:", error);
    }
  }
  // 尝试从旧版本的message中迁移
  const legacyMessages = localStorage.getItem(LEGACY_MESSAGE_KEY);
  if (legacyMessages) {
    try {
      const messages = JSON.parse(legacyMessages);
      localStorage.setItem(SETTINGS_STORAGE_KEY, JSON.stringify(messages));
      // 可选：删除旧的message
      localStorage.removeItem(LEGACY_MESSAGE_KEY);
      return messages; // 返回迁移后的消息
    } catch (error) {
      console.error("迁移旧消息失败:", error);
    }
  }

  // 如果没有旧设置或迁移失败，返回空对象
  return {};
}

/**
 * 保存所有设置到localStorage
 */
function saveSettings() {
  try {
    localStorage.setItem(SETTINGS_STORAGE_KEY, JSON.stringify(settingsCache));
  } catch (error) {
    console.error("保存设置失败:", error);
  }
}

/**
 * 获取设置项的值
 * @param {string} key - 设置项键名
 * @returns {any} 设置项的值
 */
function getSetting(key) {
  if (!settingsCache) {
    loadSettings();
  }

  const definition = settingsDefinitions[key];
  if (!definition) {
    console.warn(`未定义的设置项: ${key}`);
    return null;
  }

  // 确保开发者相关设置正确处理
  if (definition.requireDeveloper) {
    const devEnabled = settingsCache['developer.enabled'];
    if (!devEnabled) {
      return definition.default;
    }
  }

  const value = settingsCache[key];
  return value !== undefined ? value : definition.default;
}

// 修改 logSettingsChange 函数，优化检查逻辑
function logSettingsChange(key, oldValue, newValue) {
  // 确保设置已加载
  if (!settingsCache) {
    loadSettings();
  }

  const shouldLog =
    settingsCache['developer.enabled'] &&
    settingsCache['developer.showDebugConfig'];

  if (shouldLog) {
    console.log(`[Settings] ${key}:`, {
      old: oldValue,
      new: newValue,
      time: new Date().toLocaleTimeString()
    });
  }
}

/**
 * 设置配置项的值
 * @param {string} key - 设置项键名
 * @param {any} value - 要设置的值
 * @returns {boolean} 是否设置成功
 */
function setSetting(key, value) {
  const definition = settingsDefinitions[key];
  if (!definition) {
    console.warn(`未定义的设置项: ${key}`);
    return false;
  }

  // 添加对开发者选项依赖的检查
  if (definition.requireDeveloper && !settingsCache["developer.enabled"]) {
    console.warn(`设置项 ${key} 需要启用开发者选项`);
    return false;
  }

  try {
    const oldValue = settingsCache[key];
    // 类型转换
    if (typeof value !== definition.type) {
      value =
        definition.type === "boolean"
          ? Boolean(value)
          : definition.type === "number"
          ? Number(value)
          : String(value);
    }

    // 验证
    if (definition.validate && !definition.validate(value)) {
      console.warn(`设置项 ${key} 的值无效`);
      return false;
    }

    if (!settingsCache) {
      loadSettings();
    }

    settingsCache[key] = value;
    saveSettings();
    logSettingsChange(key, oldValue, value);

    // 为了保持向后兼容，同时更新旧的localStorage键
    const legacyKey = definition.legacyKey;
    if (legacyKey) {
      localStorage.setItem(legacyKey, value.toString());
    }

    return true;
  } catch (error) {
    console.error(`设置配置项 ${key} 失败:`, error);
    return false;
  }
}

/**
 * 重置指定设置项到默认值
 * @param {string} key - 设置项键名
 */
function resetSetting(key) {
  const definition = settingsDefinitions[key];
  if (!definition) {
    console.warn(`未定义的设置项: ${key}`);
    return;
  }

  if (!settingsCache) {
    loadSettings();
  }

  settingsCache[key] = definition.default;
  saveSettings();
}

/**
 * 重置所有设置项到默认值
 */
function resetAllSettings() {
  settingsCache = {};
  for (const [key, definition] of Object.entries(settingsDefinitions)) {
    settingsCache[key] = definition.default;
  }
  saveSettings();
}

/**
 * 监听设置变化
 * @param {Function} callback - 当设置改变时调用的回调函数
 * @returns {Function} 取消监听的函数
 */
function watchSettings(callback) {
  const handler = (event) => {
    if (event.key === SETTINGS_STORAGE_KEY) {
      settingsCache = JSON.parse(event.newValue);
      callback(settingsCache);
    }
  };

  window.addEventListener("storage", handler);
  return () => window.removeEventListener("storage", handler);
}

// 初始化设置
loadSettings();

export {
  settingsDefinitions,
  getSetting,
  setSetting,
  resetSetting,
  resetAllSettings,
  watchSettings,
};