/**
 * 文件操作相关的功能类
 * @type {module}
 */
import { XmlUtils } from './xml-utils.js';

export class FileOperations {
    /**
     * 加载服务文件列表
     */
    static async loadServiceFiles() {
        try {
            const response = await fetch('/api/service-files');
            if (!response.ok) {
                throw new Error(`服务器响应错误: ${response.status}`);
            }
            return await response.json();
        } catch (error) {
            console.error('加载服务文件失败:', error);
            
            // 延迟3秒后重试
            return new Promise((resolve) => {
                setTimeout(async () => {
                    try {
                        console.log('尝试重新加载服务文件列表...');
                        const retryResponse = await fetch('/api/service-files');
                        if (retryResponse.ok) {
                            resolve(await retryResponse.json());
                        } else {
                            console.error('重试加载服务文件失败');
                            resolve([]);
                        }
                    } catch (retryError) {
                        console.error('重试加载服务文件失败:', retryError);
                        resolve([]);
                    }
                }, 3000);
            });
        }
    }

    /**
     * 加载文件内容
     */
    static async loadFileContent(filePath) {
        try {
            const response = await fetch(`/api/service-file-content?path=${encodeURIComponent(filePath)}`);
            if (!response.ok) {
                throw new Error(`服务器响应错误: ${response.status}`);
            }
            
            const content = await response.text();
            
            // 解析XML内容
            const parser = new DOMParser();
            let xmlDoc;
            
            try {
                xmlDoc = parser.parseFromString(content, 'application/xml');
                // 检查解析错误
                const parseError = xmlDoc.querySelector('parsererror');
                if (parseError) {
                    throw new Error('XML解析错误');
                }
                
                // 特殊处理CommandList元素，确保命令以属性方式存储
                XmlUtils.ensureCommandListFormat(xmlDoc);
                
                return { 
                    content,
                    xmlDoc,
                    error: null 
                };
            } catch (parseError) {
                console.error('XML解析错误:', parseError);          
            }
        } catch (error) {
            console.error('加载文件内容失败:', error);
            return { 
                content: null,
                xmlDoc: null,
                error: error.message 
            };
        }
    }

    /**
     * 保存文件内容
     */
    static async saveFileContent(filePath, content) {
        try {
            const response = await fetch('/api/save-service-file', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json'
                },
                body: JSON.stringify({
                    path: filePath,
                    content: content
                })
            });
            
            if (!response.ok) {
                const errorData = await response.json();
                throw new Error(errorData.error || `保存失败: ${response.status}`);
            }
            
            return await response.json();
        } catch (error) {
            console.error('保存文件失败:', error);
            throw error;
        }
    }

    /**
     * 创建新配置
     */
    static async createNewConfig(fileName) {
        try {
            const response = await fetch('/api/create-service-file', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json'
                },
                body: JSON.stringify({ fileName })
            });
            
            if (!response.ok) {
                const errorData = await response.json();
                throw new Error(errorData.error || `创建失败: ${response.status}`);
            }
            
            return await response.json();
        } catch (error) {
            console.error('创建新配置文件失败:', error);
            throw error;
        }
    }

    /**
     * 另存为新文件
     */
    static async saveFileAs(fileName, content, currentFile, overwrite = false) {
        try {
            const response = await fetch('/api/save-service-as', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json'
                },
                body: JSON.stringify({
                    fileName,
                    content,
                    currentFile,
                    overwrite
                })
            });
            
            if (!response.ok) {
                const errorData = await response.json();
                return {
                    success: false,
                    data: errorData,
                    error: errorData.error || `保存失败: ${response.status}`
                };
            }
            
            const result = await response.json();
            return {
                success: true,
                data: result,
                error: null
            };
        } catch (error) {
            console.error('另存为失败:', error);
            return {
                success: false,
                data: null,
                error: error.message
            };
        }
    }
}