package foundation.send.mail;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;

import foundation.io.FileRepository;
import foundation.server.config.ServerStatus;
import foundation.variant.expression.VariantExpression;

public class MailTemplate {

	private String fileName;
	private File file;
	private long lastloadTime;
	private VariantExpression content;
	
	
	public MailTemplate(String fileName) {
		this.fileName = fileName;
		this.lastloadTime = 0;
		
		content = new VariantExpression();
		content.setFlag_Variant('$');
	}
	
	public boolean isDirty() {
		//1. 如果已经加载过，且不需要检查配置更新, 不需要重新加载
		if (lastloadTime > 0  && !ServerStatus.isCheckMetaUpdateOnTime()) {
			return false;
		}
		
		//2. 如果文件最后更新时间小于等于加载时间，不需要重新加载
		if (file != null) {
			long now = file.lastModified();
			if (lastloadTime >= now) {
				return false;
			}
		}
		
		//3. 其他情况，需要重新加载
		return true;
	}

	public void load() throws Exception {
		File path = FileRepository.getTemplatePath(); 
        file = new File(path, fileName);
        
        if (!file.exists()) {
        	throw new Exception("mail template not exists: " + file);
        }
        
        lastloadTime = file.lastModified();
        content.clear();
        
        InputStream inputStream = new FileInputStream(file);
        try {
        	InputStreamReader reader = null; BufferedReader bufferedReader = null;
        	
        	try {
                reader = new InputStreamReader(inputStream, "UTF-8");
                bufferedReader = new BufferedReader(reader);
                
                String line = null;
                while ((line = bufferedReader.readLine()) != null) {
                	content.parseOneLine(line);
                }
        	}
        	finally {
        		if (bufferedReader != null) {
        			try {
        				bufferedReader.close();
        			}
            		catch (Exception e) {
					}
        		}
        		if (reader != null) {
        			try {
            			reader.close();
        			}
            		catch (Exception e) {
					}
        		} 
        	}
        } 
        finally {
			try {
				inputStream.close();
			}
    		catch (Exception e) {
			}        	
        }
	}

	public VariantExpression getContent() {
		return content;
	}
	
	public String getContentValue() {
		return content.getString();
	}
	
}