package com.svnmanager.util;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.type.CollectionType;
import com.svnmanager.model.Project;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;

/**
 * 配置管理工具类
 */
public class ConfigUtil {
    private static final Logger logger = LoggerFactory.getLogger(ConfigUtil.class);
    private static final String CONFIG_DIR = System.getProperty("user.home") + File.separator + ".svn-manager";
    private static final String PROJECTS_FILE = CONFIG_DIR + File.separator + "projects.json";
    private static final ObjectMapper objectMapper = new ObjectMapper();
    
    static {
        // 确保配置目录存在
        try {
            Path configPath = Paths.get(CONFIG_DIR);
            if (!Files.exists(configPath)) {
                Files.createDirectories(configPath);
            }
        } catch (IOException e) {
            logger.error("创建配置目录失败", e);
        }
    }
    
    /**
     * 加载项目列表
     * 
     * @return 项目列表
     */
    public static List<Project> loadProjects() {
        File file = new File(PROJECTS_FILE);
        if (!file.exists()) {
            logger.info("项目配置文件不存在，返回空列表");
            return new ArrayList<>();
        }
        
        try {
            CollectionType listType = objectMapper.getTypeFactory()
                    .constructCollectionType(List.class, Project.class);
            List<Project> projects = objectMapper.readValue(file, listType);
            logger.info("成功加载 {} 个项目", projects.size());
            return projects;
        } catch (IOException e) {
            logger.error("加载项目配置失败", e);
            return new ArrayList<>();
        }
    }
    
    /**
     * 保存项目列表
     * 
     * @param projects 项目列表
     * @return 是否保存成功
     */
    public static boolean saveProjects(List<Project> projects) {
        File file = new File(PROJECTS_FILE);
        try {
            objectMapper.writerWithDefaultPrettyPrinter().writeValue(file, projects);
            logger.info("成功保存 {} 个项目", projects.size());
            return true;
        } catch (IOException e) {
            logger.error("保存项目配置失败", e);
            return false;
        }
    }
    
    /**
     * 添加项目
     * 
     * @param project 项目
     * @return 是否添加成功
     */
    public static boolean addProject(Project project) {
        if (project.getId() == null || project.getId().isEmpty()) {
            project.setId(UUID.randomUUID().toString());
        }
        
        List<Project> projects = loadProjects();
        projects.add(project);
        return saveProjects(projects);
    }
    
    /**
     * 更新项目
     * 
     * @param project 项目
     * @return 是否更新成功
     */
    public static boolean updateProject(Project project) {
        List<Project> projects = loadProjects();
        for (int i = 0; i < projects.size(); i++) {
            if (projects.get(i).getId().equals(project.getId())) {
                Project existing = projects.get(i);
                // 密码留空时保留原密码
                if (project.getPassword() == null || project.getPassword().isEmpty()) {
                    project.setPassword(existing.getPassword());
                }
                projects.set(i, project);
                return saveProjects(projects);
            }
        }
        return false;
    }
    
    /**
     * 删除项目
     * 
     * @param projectId 项目ID
     * @return 是否删除成功
     */
    public static boolean deleteProject(String projectId) {
        List<Project> projects = loadProjects();
        projects.removeIf(p -> p.getId().equals(projectId));
        return saveProjects(projects);
    }
    
    /**
     * 根据ID获取项目
     * 
     * @param projectId 项目ID
     * @return 项目，如果不存在返回null
     */
    public static Project getProjectById(String projectId) {
        List<Project> projects = loadProjects();
        return projects.stream()
                .filter(p -> p.getId().equals(projectId))
                .findFirst()
                .orElse(null);
    }
    
    /**
     * 获取配置目录路径
     * 
     * @return 配置目录路径
     */
    public static String getConfigDir() {
        return CONFIG_DIR;
    }
    
    /**
     * 获取项目配置文件路径
     * 
     * @return 项目配置文件路径
     */
    public static String getProjectsFilePath() {
        return PROJECTS_FILE;
    }
}