package foundation.io;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.commons.io.FileUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import foundation.io.object.FileItemAgent;
import foundation.server.config.Configer;
import foundation.token.IOnlineUser;
import foundation.token.IUser;
import foundation.util.Util;

public class FileRepository {
	
	protected static Logger logger;
	public static String Default_Template = "empty.xlsx";
	
	static {
		logger = LogManager.getLogger(FileRepository.class);
	}

	//获取目录--模板存放目录
	public static File getTemplatePath() {
		String path = Configer.getParam("PathRepository") + "template/";
		
		File file = new File(path);
		
		if (!file.exists()) {
			file.mkdirs();
		}
		
		return file;
	}
	
	//获取目录--用户临时目录
	public static File getUserTempPath(IUser user) {
		String path = Configer.getParam("PathRepository") + "temp/" + user.getCode() + "/" + Util.newDateTimeStr("yyyy/MM") + "/";
		
		File file = new File(path);
		
		if (!file.exists()) {
			file.mkdirs();
		}
		
		return file;
	}
	
	public static String urlToPath(String fileURL) {
		String path = Configer.getParam("PathRepository") + fileURL;
		return path;
	}

	public static String pathToURL(File file) {
		String root = new File(Configer.getParam("PathRepository")).toString();
		String path = file.toString();
		
		path = path.substring(root.length() + 1);
		return path;
	}
	
	//获取目录--上载文件目录
	public static File getUploadPath(IOnlineUser user) throws IOException {
		String userName = user.getName();
		String path = Configer.getParam("PathRepository") + "upload/" + userName +  Util.newDateTimeStr("/yyyy/MM");
		
		File file = new File(path);
		
		if (!file.exists()) {
			FileUtils.forceMkdir(file);
		}
		
		return file;
	}
	
	//获取文件--模板文件
	public static File getTemplateFile(String templateName) {
		File template =  new File(getTemplatePath(), templateName);
		return template;
	}
	
	//创建文件--上载临时文件
	public static File createUploadRepositoryFile(IOnlineUser user, String fileName) throws Exception {
		if (Util.isEmpty(fileName)) {
			throw new Exception("can not create upload repository file: file name is empty");
		}
		
		//1. path
		File path = getUploadPath(user);
		
        //2. file name
		fileName = addTimeStamp(fileName);
		File file = new File(path, fileName);

		return file;	
	}
	
	//创建文件--数据导入临时文件
	public static File createImportTempFile(IUser user, FileItemAgent fileForm) throws Exception {
		//1. get user temporary path
		File tempPath = getUserTempPath(user);
		
		//2. get file
		String fileName = fileForm.getName();
		fileName = addTimeStamp(fileName);
		File tempFile = new File(tempPath, fileName);  
		
		//3. save to file
        OutputStream outputStream = new FileOutputStream(tempFile);  
        InputStream inputStream = fileForm.getInputStream();
        try {
        	byte buf[] = new byte[1024];
        	
            int length = 0;    
            while((length = inputStream.read(buf)) > 0){    
            	outputStream.write(buf, 0, length);    
            }  
        }
        finally {
        	try {
        		outputStream.flush();
        		outputStream.close();
        	}
        	catch (Exception e) {
			}
        	
        	try {
        		inputStream.close();
        	}
        	catch (Exception e) {
			}       	
        }
        
		return tempFile;
	}
	
	//创建文件--下载临时文件
	public static File createExportTempFile(IUser user, String templateName, String fileName) throws Exception {
		//1. get template
		if (Util.isEmpty(templateName)) {
			templateName = Default_Template;
		}
		
		File template =  new File(getTemplatePath(), clearVariants(templateName));
		
		if (!template.exists()) {
			throw new Exception("template file not exists: " + template);
		}
		
		//2. get temporary path
		File tempPath = getUserTempPath(user);
		
		//3. get temporary file
		fileName = fillVariants(fileName);
		fileName = addSuffix(fileName, templateName);
		
		File tempFile = new File(tempPath, fileName);
		
		if (tempFile.exists()) {
			tempFile.delete();
		}
		
		//4. copy template to 
		FileUtils.copyFile(template, tempFile);
		return tempFile;
	}
	
	//创建文件--模板注入临时文件
	public static File createInjectTempFile(IUser user, String templateName) throws Exception {
		//1. get user temporary path
		File tempPath = getUserTempPath(user);
		
		//2. get template
		templateName = addTimeStamp(templateName);
		File tempFile =  new File(tempPath, templateName);
		
		if (tempFile.exists()) {
			tempFile.delete();
		}
		
		return tempFile;
	}
	
	private static String clearVariants(String fileName) {
		//KA医院管理-@{YYYYMMdd}
		
		if (fileName == null) {
			return null;
		}
		
		fileName = fileName.trim();
		
		int begin = fileName.indexOf("@{");
		if (begin <= 0) {
			return fileName;
		}
		
		int end = fileName.indexOf("}");
		if (end <= 0) {
			end = fileName.length();
		}
		
		String result = fileName.substring(0, begin) + fileName.substring(end + 1);
		return result;
	}
	
	public static String addTimeStamp(String fileName) {
		//KA医院管理-20230102-101234180
		int pos = fileName.lastIndexOf(".");
		
		if (pos < 0) {
			return fileName;
		}
		
		String timeStamp = Util.newDateTimeStr("-yyyyMMdd-kkmmssSSS");
		String result = fileName.substring(0, pos) + timeStamp + fileName.substring(pos);
		return result;
	}

	public static String fillVariants(String fileName) {
		//KA医院管理-@{YYYYMMdd}
		
		if (fileName == null) {
			return null;
		}
		
		fileName = fileName.trim();
		
		int begin = fileName.indexOf("@{");
		if (begin <= 0) {
			return fileName;
		}
		
		int end = fileName.indexOf("}");
		if (end <= 0) {
			end = fileName.length();
		}
		
		String result = fileName.substring(0, begin) + parseVariant(fileName.substring(begin + 2, end)) + fileName.substring(end + 1);
		return result;
	}
	
	private static String addSuffix(String fileName, String templateName) {
		int pos = fileName.lastIndexOf(".");
		
		if (pos > 0) {
			return fileName;
		}
		
		pos = templateName.lastIndexOf(".");
		
		if (pos < 0) {
			return fileName;
		}
		
		String suffix = templateName.substring(pos, templateName.length());
		fileName = fileName + suffix;
		return fileName;
	}

	private static String parseVariant(String value) {
		return Util.newDateTimeStr(value);
	}

}