/**
 * 词典扩展功能接口定义
 * 为下载词典和本地词典功能预留接口和数据结构
 */

// ========== 数据结构定义 ==========

/**
 * 官方词典仓库配置
 */
const OFFICIAL_REPOSITORY_CONFIG = {
    baseUrl: 'https://api.github.com/repos/your-org/adhd-dictionaries',
    branch: 'main',
    timeout: 30000,
    retryAttempts: 3,
    supportedFormats: ['json'],
    maxFileSize: 50 * 1024 * 1024 // 50MB
};

/**
 * 下载状态枚举
 */
const DOWNLOAD_STATUS = {
    PENDING: 'pending',
    DOWNLOADING: 'downloading',
    COMPLETED: 'completed',
    FAILED: 'failed',
    CANCELLED: 'cancelled'
};

/**
 * 词典类型枚举
 */
const DICTIONARY_TYPES = {
    PRESET: 'preset',
    DOWNLOADED: 'downloaded',
    LOCAL: 'local'
};

/**
 * 词典验证规则
 */
const DICTIONARY_VALIDATION_RULES = {
    requiredFields: ['meta', 'version', 'words'],
    metaRequiredFields: ['id', 'name', 'language', 'type'],
    maxWords: 1000000,
    minWords: 100,
    supportedLanguages: ['zh', 'en', 'es', 'fr', 'ja', 'ru', 'de', 'it', 'pt', 'ko'],
    maxFileSize: 100 * 1024 * 1024 // 100MB
};

// ========== 接口定义 ==========

/**
 * 官方词典仓库管理器接口
 */
class OfficialRepositoryManager {
    constructor() {
        this.config = OFFICIAL_REPOSITORY_CONFIG;
        this.cache = new Map();
        this.lastFetchTime = null;
    }

    /**
     * 获取可下载的词典列表
     * @param {boolean} forceRefresh - 是否强制刷新
     * @returns {Promise<Array>} 可下载词典列表
     */
    async getAvailableDictionaries(forceRefresh = false) {
        // TODO: 实现从官方仓库获取词典列表
        console.log('OfficialRepositoryManager.getAvailableDictionaries not implemented');
        return [];
    }

    /**
     * 搜索词典
     * @param {string} query - 搜索关键词
     * @param {Object} filters - 过滤条件
     * @returns {Promise<Array>} 搜索结果
     */
    async searchDictionaries(query, filters = {}) {
        // TODO: 实现词典搜索功能
        console.log('OfficialRepositoryManager.searchDictionaries not implemented');
        return [];
    }

    /**
     * 获取词典详细信息
     * @param {string} dictionaryId - 词典ID
     * @returns {Promise<Object|null>} 词典详细信息
     */
    async getDictionaryDetails(dictionaryId) {
        // TODO: 实现获取词典详细信息
        console.log('OfficialRepositoryManager.getDictionaryDetails not implemented');
        return null;
    }

    /**
     * 检查词典更新
     * @param {Array} installedDictionaries - 已安装词典列表
     * @returns {Promise<Array>} 有更新的词典列表
     */
    async checkForUpdates(installedDictionaries) {
        // TODO: 实现更新检查
        console.log('OfficialRepositoryManager.checkForUpdates not implemented');
        return [];
    }
}

/**
 * 词典下载管理器接口
 */
class DictionaryDownloadManager {
    constructor() {
        this.downloads = new Map();
        this.downloadQueue = [];
        this.maxConcurrentDownloads = 3;
        this.activeDownloads = 0;
    }

    /**
     * 下载词典
     * @param {string} dictionaryId - 词典ID
     * @param {Object} options - 下载选项
     * @param {Function} progressCallback - 进度回调
     * @returns {Promise<boolean>} 下载是否成功
     */
    async downloadDictionary(dictionaryId, options = {}, progressCallback = null) {
        // TODO: 实现词典下载
        console.log('DictionaryDownloadManager.downloadDictionary not implemented');
        return false;
    }

    /**
     * 取消下载
     * @param {string} downloadId - 下载ID
     * @returns {Promise<boolean>} 取消是否成功
     */
    async cancelDownload(downloadId) {
        // TODO: 实现取消下载
        console.log('DictionaryDownloadManager.cancelDownload not implemented');
        return false;
    }

    /**
     * 获取下载状态
     * @param {string} downloadId - 下载ID
     * @returns {Object|null} 下载状态信息
     */
    getDownloadStatus(downloadId) {
        // TODO: 实现获取下载状态
        console.log('DictionaryDownloadManager.getDownloadStatus not implemented');
        return null;
    }

    /**
     * 获取所有下载任务
     * @returns {Array} 下载任务列表
     */
    getAllDownloads() {
        // TODO: 实现获取所有下载任务
        console.log('DictionaryDownloadManager.getAllDownloads not implemented');
        return [];
    }

    /**
     * 清理已完成的下载记录
     * @returns {Promise<number>} 清理的记录数量
     */
    async cleanupCompletedDownloads() {
        // TODO: 实现清理已完成下载
        console.log('DictionaryDownloadManager.cleanupCompletedDownloads not implemented');
        return 0;
    }
}

/**
 * 本地词典管理器接口
 */
class LocalDictionaryManager {
    constructor() {
        this.localDictionaries = new Map();
        this.storageQuota = 500 * 1024 * 1024; // 500MB
        this.usedStorage = 0;
    }

    /**
     * 导入本地词典文件
     * @param {File} file - 词典文件
     * @param {Object} metadata - 词典元数据
     * @param {Function} progressCallback - 进度回调
     * @returns {Promise<boolean>} 导入是否成功
     */
    async importDictionary(file, metadata, progressCallback = null) {
        // TODO: 实现本地词典导入
        console.log('LocalDictionaryManager.importDictionary not implemented');
        return false;
    }

    /**
     * 验证词典文件
     * @param {File|Object} dictionaryData - 词典数据
     * @returns {Promise<Object>} 验证结果
     */
    async validateDictionary(dictionaryData) {
        // TODO: 实现词典验证
        console.log('LocalDictionaryManager.validateDictionary not implemented');
        return { valid: false, errors: ['Not implemented'] };
    }

    /**
     * 删除本地词典
     * @param {string} dictionaryId - 词典ID
     * @returns {Promise<boolean>} 删除是否成功
     */
    async removeDictionary(dictionaryId) {
        // TODO: 实现删除本地词典
        console.log('LocalDictionaryManager.removeDictionary not implemented');
        return false;
    }

    /**
     * 导出词典
     * @param {string} dictionaryId - 词典ID
     * @param {string} format - 导出格式
     * @returns {Promise<Blob|null>} 导出的文件数据
     */
    async exportDictionary(dictionaryId, format = 'json') {
        // TODO: 实现词典导出
        console.log('LocalDictionaryManager.exportDictionary not implemented');
        return null;
    }

    /**
     * 获取存储使用情况
     * @returns {Promise<Object>} 存储使用情况
     */
    async getStorageUsage() {
        // TODO: 实现获取存储使用情况
        console.log('LocalDictionaryManager.getStorageUsage not implemented');
        return {
            used: 0,
            total: this.storageQuota,
            available: this.storageQuota,
            dictionaries: []
        };
    }

    /**
     * 清理存储空间
     * @param {number} targetSize - 目标清理大小（字节）
     * @returns {Promise<number>} 实际清理的大小
     */
    async cleanupStorage(targetSize) {
        // TODO: 实现存储清理
        console.log('LocalDictionaryManager.cleanupStorage not implemented');
        return 0;
    }
}

/**
 * 词典同步管理器接口
 */
class DictionarySyncManager {
    constructor() {
        this.syncEnabled = false;
        this.lastSyncTime = null;
        this.syncConflicts = [];
    }

    /**
     * 同步词典设置
     * @param {Object} settings - 同步设置
     * @returns {Promise<boolean>} 同步是否成功
     */
    async syncSettings(settings) {
        // TODO: 实现设置同步
        console.log('DictionarySyncManager.syncSettings not implemented');
        return false;
    }

    /**
     * 解决同步冲突
     * @param {string} conflictId - 冲突ID
     * @param {string} resolution - 解决方案
     * @returns {Promise<boolean>} 解决是否成功
     */
    async resolveConflict(conflictId, resolution) {
        // TODO: 实现冲突解决
        console.log('DictionarySyncManager.resolveConflict not implemented');
        return false;
    }

    /**
     * 获取同步状态
     * @returns {Object} 同步状态信息
     */
    getSyncStatus() {
        // TODO: 实现获取同步状态
        console.log('DictionarySyncManager.getSyncStatus not implemented');
        return {
            enabled: this.syncEnabled,
            lastSync: this.lastSyncTime,
            conflicts: this.syncConflicts.length,
            status: 'not_implemented'
        };
    }
}

// ========== 工具函数 ==========

/**
 * 词典文件验证工具
 */
class DictionaryValidator {
    /**
     * 验证词典结构
     * @param {Object} dictionaryData - 词典数据
     * @returns {Object} 验证结果
     */
    static validateStructure(dictionaryData) {
        const errors = [];
        const warnings = [];

        // 检查必需字段
        for (const field of DICTIONARY_VALIDATION_RULES.requiredFields) {
            if (!dictionaryData[field]) {
                errors.push(`Missing required field: ${field}`);
            }
        }

        // 检查meta字段
        if (dictionaryData.meta) {
            for (const field of DICTIONARY_VALIDATION_RULES.metaRequiredFields) {
                if (!dictionaryData.meta[field]) {
                    errors.push(`Missing required meta field: ${field}`);
                }
            }
        }

        // 检查词汇数量
        if (dictionaryData.words) {
            const wordCount = Object.keys(dictionaryData.words).length;
            if (wordCount < DICTIONARY_VALIDATION_RULES.minWords) {
                warnings.push(`Word count (${wordCount}) is below recommended minimum (${DICTIONARY_VALIDATION_RULES.minWords})`);
            }
            if (wordCount > DICTIONARY_VALIDATION_RULES.maxWords) {
                errors.push(`Word count (${wordCount}) exceeds maximum limit (${DICTIONARY_VALIDATION_RULES.maxWords})`);
            }
        }

        return {
            valid: errors.length === 0,
            errors,
            warnings
        };
    }

    /**
     * 验证词典语言
     * @param {string} language - 语言代码
     * @returns {boolean} 是否支持该语言
     */
    static validateLanguage(language) {
        return DICTIONARY_VALIDATION_RULES.supportedLanguages.includes(language);
    }

    /**
     * 验证文件大小
     * @param {number} fileSize - 文件大小（字节）
     * @returns {boolean} 文件大小是否合法
     */
    static validateFileSize(fileSize) {
        return fileSize <= DICTIONARY_VALIDATION_RULES.maxFileSize;
    }
}

/**
 * 词典格式转换工具
 */
class DictionaryConverter {
    /**
     * 转换为标准格式
     * @param {Object} dictionaryData - 原始词典数据
     * @param {string} sourceFormat - 源格式
     * @returns {Object} 标准格式词典数据
     */
    static toStandardFormat(dictionaryData, sourceFormat) {
        // TODO: 实现格式转换
        console.log('DictionaryConverter.toStandardFormat not implemented');
        return dictionaryData;
    }

    /**
     * 从标准格式转换
     * @param {Object} standardData - 标准格式词典数据
     * @param {string} targetFormat - 目标格式
     * @returns {Object} 目标格式词典数据
     */
    static fromStandardFormat(standardData, targetFormat) {
        // TODO: 实现格式转换
        console.log('DictionaryConverter.fromStandardFormat not implemented');
        return standardData;
    }
}

// ========== 导出 ==========

if (typeof module !== 'undefined' && module.exports) {
    module.exports = {
        OFFICIAL_REPOSITORY_CONFIG,
        DOWNLOAD_STATUS,
        DICTIONARY_TYPES,
        DICTIONARY_VALIDATION_RULES,
        OfficialRepositoryManager,
        DictionaryDownloadManager,
        LocalDictionaryManager,
        DictionarySyncManager,
        DictionaryValidator,
        DictionaryConverter
    };
} else if (typeof window !== 'undefined') {
    // 将接口添加到全局作用域
    Object.assign(window, {
        OFFICIAL_REPOSITORY_CONFIG,
        DOWNLOAD_STATUS,
        DICTIONARY_TYPES,
        DICTIONARY_VALIDATION_RULES,
        OfficialRepositoryManager,
        DictionaryDownloadManager,
        LocalDictionaryManager,
        DictionarySyncManager,
        DictionaryValidator,
        DictionaryConverter
    });
}