const { getDBConnection } = require('./file-utils');

// 查询XNServices表中的所有服务
function getServices() {
  try {
    const db = getDBConnection(true);
    
    // 查询所有服务
    const services = db.prepare(`
      SELECT ServiceName, ServiceName_CN, Description, ClassName 
      FROM 'XNServices' 
      ORDER BY ServiceName
    `).all();
    
    return services;
  } catch (error) {
    console.error('获取服务列表数据失败:', error.message);
    throw error;
  }
}

// 根据ClassName查询XNServiceVersion表中的服务版本
function getServiceVersionsByClassName(className) {
  try {
    const db = getDBConnection(true);
    
    // 查询该类名下的所有版本
    const versions = db.prepare(`
      SELECT ClassName, Name, Version, CodePath, Author, Description, 
      CreatTime, ChangeTime, CmdList, OtherParam
      FROM 'XNServiceVersion' 
      WHERE ClassName = ? 
      ORDER BY Version DESC
    `).all(className);
    
    return versions;
  } catch (error) {
    console.error(`获取服务${className}的版本数据失败:`, error.message);
    throw error;
  }
}

// 保存或更新服务版本信息
function saveServiceVersion(versionData) {
  try {
    // 验证必填字段
    const requiredFields = ['ClassName', 'Name', 'Version', 'Author'];
    for (const field of requiredFields) {
      if (!versionData[field]) {
        throw new Error(`${field} 是必填字段`);
      }
    }

    const db = getDBConnection();
    
    // 检查是否为更新模式
    if (versionData.isUpdate) {
      // 查询是否存在要更新的版本
      const existingVersion = db.prepare(`
        SELECT COUNT(*) as count FROM 'XNServiceVersion' 
        WHERE ClassName = ? AND Version = ?
      `).get(versionData.ClassName, versionData.originalVersion || versionData.Version);
      
      if (existingVersion.count === 0) {
        // 不存在要更新的版本，创建新版本
        return saveNewServiceVersion(db, versionData);
      }
      
      // 使用前端传来的修改时间，如果没有则生成当前时间
      let changeTime = versionData.ChangeTime;
      if (!changeTime) {
        // 生成当前时间，格式为YYYY-MM-DD HH:MM:SS
        const now = new Date();
        const year = now.getFullYear();
        const month = String(now.getMonth() + 1).padStart(2, '0');
        const day = String(now.getDate()).padStart(2, '0');
        const hours = String(now.getHours()).padStart(2, '0');
        const minutes = String(now.getMinutes()).padStart(2, '0');
        const seconds = String(now.getSeconds()).padStart(2, '0');
        changeTime = `${year}-${month}-${day} ${hours}:${minutes}:${seconds}`;
      }
      
      // 更新现有版本
      const updateResult = db.prepare(`
        UPDATE 'XNServiceVersion' 
        SET 
          Name = ?,
          Version = ?,
          Author = ?,
          Description = ?,
          CodePath = ?,
          ChangeTime = ?,
          CmdList = ?,
          OtherParam = ?
        WHERE ClassName = ? AND Version = ?
      `).run(
        versionData.Name,
        versionData.Version,
        versionData.Author,
        versionData.Description || '',
        versionData.CodePath || '',
        changeTime, // 使用前端传来的时间或生成的当前时间
        versionData.CmdList || '[]',
        versionData.OtherParam || '{}',
        versionData.ClassName,
        versionData.originalVersion || versionData.Version
      );
      
      return {
        success: true,
        isNew: false,
        changes: updateResult.changes,
        message: '服务版本更新成功'
      };
    } else {
      // 创建新版本
      return saveNewServiceVersion(db, versionData);
    }
  } catch (error) {
    console.error('保存服务版本时出错:', error);
    throw error;
  }
}

// 内部函数：保存新的服务版本
function saveNewServiceVersion(db, versionData) {
  try {
    // 检查版本是否已存在
    const existingVersion = db.prepare(`
      SELECT COUNT(*) as count FROM 'XNServiceVersion' 
      WHERE ClassName = ? AND Version = ?
    `).get(versionData.ClassName, versionData.Version);
    
    if (existingVersion.count > 0) {
      throw new Error(`版本 ${versionData.Version} 已存在，请使用其他版本号`);
    }
    
    // 生成当前时间，格式为YYYY-MM-DD HH:MM:SS
    const now = new Date();
    const year = now.getFullYear();
    const month = String(now.getMonth() + 1).padStart(2, '0');
    const day = String(now.getDate()).padStart(2, '0');
    const hours = String(now.getHours()).padStart(2, '0');
    const minutes = String(now.getMinutes()).padStart(2, '0');
    const seconds = String(now.getSeconds()).padStart(2, '0');
    const formattedDateTime = `${year}-${month}-${day} ${hours}:${minutes}:${seconds}`;
    
    // 使用前端传来的时间或生成的时间
    const createTime = versionData.CreatTime || formattedDateTime;
    const changeTime = versionData.ChangeTime || formattedDateTime;
    
    // 插入新版本
    const insertResult = db.prepare(`
      INSERT INTO 'XNServiceVersion' (
        ClassName, Name, Version, CodePath, Author, Description, 
        CreatTime, ChangeTime, CmdList, OtherParam
      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
    `).run(
      versionData.ClassName,
      versionData.Name,
      versionData.Version,
      versionData.CodePath || '',
      versionData.Author,
      versionData.Description || '',
      createTime, // 使用前端传来的创建时间或生成的当前时间
      changeTime,  // 使用前端传来的修改时间或生成的当前时间
      versionData.CmdList || '[]',
      versionData.OtherParam || '{}'
    );
    
    return {
      success: true,
      isNew: true,
      id: insertResult.lastInsertRowid,
      message: '服务版本创建成功'
    };
  } catch (error) {
    console.error('创建服务版本失败:', error);
    throw error;
  }
}

// 创建新服务
function createService(serviceData) {
  try {
    // 验证必填字段
    const requiredFields = ['ClassName', 'ServiceName', 'ServiceName_CN'];
    for (const field of requiredFields) {
      if (!serviceData[field]) {
        throw new Error(`${field} 是必填字段`);
      }
    }

    // 验证类名是否以XN开头
    if (!serviceData.ClassName.startsWith('XN')) {
      throw new Error('服务类名必须以XN开头');
    }

    const db = getDBConnection();

    // 检查服务类名是否已存在
    const existingService = db.prepare(`
      SELECT COUNT(*) as count FROM 'XNServices' 
      WHERE ClassName = ?
    `).get(serviceData.ClassName);
    
    if (existingService.count > 0) {
      throw new Error(`服务类名 ${serviceData.ClassName} 已存在，请使用其他类名`);
    }

    // 检查服务名称是否已存在
    const existingServiceName = db.prepare(`
      SELECT COUNT(*) as count FROM 'XNServices' 
      WHERE ServiceName = ?
    `).get(serviceData.ServiceName);
    
    if (existingServiceName.count > 0) {
      throw new Error(`服务名称 ${serviceData.ServiceName} 已存在，请使用其他名称`);
    }
    
    // 插入新服务
    const insertResult = db.prepare(`
      INSERT INTO 'XNServices' (
        ClassName, ServiceName, ServiceName_CN, Description
      ) VALUES (?, ?, ?, ?)
    `).run(
      serviceData.ClassName,
      serviceData.ServiceName,
      serviceData.ServiceName_CN,
      serviceData.Description || ''
    );
    
    return {
      success: true,
      id: insertResult.lastInsertRowid,
      message: '服务创建成功'
    };
  } catch (error) {
    console.error('创建服务失败:', error);
    throw error;
  }
}

module.exports = {
  getServices,
  getServiceVersionsByClassName,
  saveServiceVersion,
  createService
};