package com.svnmanager.service;

import com.svnmanager.util.ProcessUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeoutException;

/**
 * Diff服务
 */
public class DiffService extends SvnService {
    private static final Logger logger = LoggerFactory.getLogger(DiffService.class);
    
    /**
     * 获取差异
     * 
     * @param workingDirectory 工作目录
     * @param filePath 文件路径（null表示所有文件）
     * @return 差异内容
     * @throws IOException IO异常
     * @throws InterruptedException 中断异常
     * @throws TimeoutException 超时异常
     */
    public String getDiff(String workingDirectory, String filePath, String username, String password) 
            throws IOException, InterruptedException, TimeoutException {
        logger.debug("获取差异: {}", workingDirectory);
        
        if (!isValidWorkingCopy(workingDirectory)) {
            throw new IllegalArgumentException("无效的SVN工作副本: " + workingDirectory);
        }
        
        List<String> args = new ArrayList<>();
        addAuthArgs(args, username, password);
        if (filePath != null && !filePath.isEmpty()) {
            args.add(filePath);
        }
        
        ProcessUtil.ProcessResult result = executeSvnCommand("diff", args, workingDirectory);
        
        if (result.isSuccess()) {
            return result.getOutputAsString();
        } else {
            logger.warn("获取差异失败: {}", result.getErrorAsString());
            return result.getErrorAsString();
        }
    }
    
    /**
     * 获取所有文件的差异
     * 
     * @param workingDirectory 工作目录
     * @return 差异内容
     * @throws IOException IO异常
     * @throws InterruptedException 中断异常
     * @throws TimeoutException 超时异常
     */
    public String getDiff(String workingDirectory)
            throws IOException, InterruptedException, TimeoutException {
        return getDiff(workingDirectory, null, null, null);
    }

    /**
     * 获取指定文件的差异（不带认证信息）
     *
     * @param workingDirectory 工作目录
     * @param filePath 文件路径（null表示所有文件）
     * @return 差异内容
     * @throws IOException IO异常
     * @throws InterruptedException 中断异常
     * @throws TimeoutException 超时异常
     */
    public String getDiff(String workingDirectory, String filePath)
            throws IOException, InterruptedException, TimeoutException {
        return getDiff(workingDirectory, filePath, null, null);
    }
}