package local

import (
	_ "embed"
	"context"
	"encoding/json"
	"fmt"
	"os/exec"
	"runtime"
	"strings"

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

//go:embed auto.json
var avDatabase []byte

// AVProduct AV产品信息结构
type AVProduct struct {
	Processes []string `json:"processes"`
	URL       string   `json:"url"`
}

// AVDetectPlugin AV/EDR检测插件 - Linus式简化版本
//
// 设计哲学："做一件事并做好" - 专注AV检测
// - 使用JSON数据库加载AV信息
// - 删除复杂的结果结构体
// - 跨平台支持，运行时适配
type AVDetectPlugin struct {
	plugins.BasePlugin
	avProducts map[string]AVProduct
}

// NewAVDetectPlugin 创建AV检测插件
func NewAVDetectPlugin() *AVDetectPlugin {
	plugin := &AVDetectPlugin{
		BasePlugin: plugins.NewBasePlugin("avdetect"),
		avProducts: make(map[string]AVProduct),
	}
	
	// 加载AV数据库
	if err := json.Unmarshal(avDatabase, &plugin.avProducts); err != nil {
		common.LogError(fmt.Sprintf("加载AV数据库失败: %v", err))
	} else {
		common.LogInfo(fmt.Sprintf("加载了 %d 个AV产品信息", len(plugin.avProducts)))
	}
	
	return plugin
}



// Scan 执行AV/EDR检测 - 直接、有效
func (p *AVDetectPlugin) Scan(ctx context.Context, info *common.HostInfo) *ScanResult {
	var output strings.Builder
	var detectedAVs []string
	
	output.WriteString("=== AV/EDR检测 ===\n")
	
	// 获取运行进程
	processes := p.getRunningProcesses()
	if len(processes) == 0 {
		return &ScanResult{
			Success: false,
			Output:  "无法获取进程列表",
			Error:   fmt.Errorf("进程列表获取失败"),
		}
	}
	
	output.WriteString(fmt.Sprintf("扫描进程数: %d\n\n", len(processes)))
	
	// 检测AV产品 - 使用JSON数据库
	for avName, avProduct := range p.avProducts {
		var foundProcesses []string
		
		for _, avProcess := range avProduct.Processes {
			for _, runningProcess := range processes {
				// 简单字符串匹配，忽略大小写
				if strings.Contains(strings.ToLower(runningProcess), strings.ToLower(avProcess)) {
					foundProcesses = append(foundProcesses, runningProcess)
				}
			}
		}
		
		if len(foundProcesses) > 0 {
			detectedAVs = append(detectedAVs, avName)
			output.WriteString(fmt.Sprintf("✓ 检测到 %s:\n", avName))
			for _, proc := range foundProcesses {
				output.WriteString(fmt.Sprintf("  - %s\n", proc))
			}
			common.LogSuccess(fmt.Sprintf("检测到AV: %s (%d个进程)", avName, len(foundProcesses)))
			output.WriteString("\n")
		}
	}
	
	// 统计结果
	output.WriteString("=== 检测结果 ===\n")
	output.WriteString(fmt.Sprintf("检测到的AV产品: %d个\n", len(detectedAVs)))
	
	if len(detectedAVs) > 0 {
		output.WriteString("检测到的产品: " + strings.Join(detectedAVs, ", ") + "\n")
	} else {
		output.WriteString("未检测到已知的AV/EDR产品\n")
	}
	
	return &ScanResult{
		Success: len(detectedAVs) > 0,
		Output:  output.String(),
		Error:   nil,
	}
}

// getRunningProcesses 获取运行进程列表 - 跨平台适配
func (p *AVDetectPlugin) getRunningProcesses() []string {
	var processes []string
	
	switch runtime.GOOS {
	case "windows":
		processes = p.getWindowsProcesses()
	case "linux", "darwin":
		processes = p.getUnixProcesses()
	default:
		// 不支持的平台，返回空列表
		return processes
	}
	
	return processes
}

// getWindowsProcesses 获取Windows进程 - 简化实现
func (p *AVDetectPlugin) getWindowsProcesses() []string {
	var processes []string
	
	// 使用tasklist命令
	cmd := exec.Command("tasklist", "/fo", "csv", "/nh")
	output, err := cmd.Output()
	if err != nil {
		return processes
	}
	
	lines := strings.Split(string(output), "\n")
	for _, line := range lines {
		line = strings.TrimSpace(line)
		if line == "" {
			continue
		}
		
		// 解析CSV格式：进程名在第一列
		if strings.HasPrefix(line, "\"") {
			parts := strings.Split(line, "\",\"")
			if len(parts) > 0 {
				processName := strings.Trim(parts[0], "\"")
				if processName != "" {
					processes = append(processes, processName)
				}
			}
		}
	}
	
	return processes
}

// getUnixProcesses 获取Unix进程 - 简化实现
func (p *AVDetectPlugin) getUnixProcesses() []string {
	var processes []string
	
	// 使用ps命令
	cmd := exec.Command("ps", "-eo", "comm")
	output, err := cmd.Output()
	if err != nil {
		return processes
	}
	
	lines := strings.Split(string(output), "\n")
	for _, line := range lines {
		line = strings.TrimSpace(line)
		if line != "" && line != "COMMAND" {
			processes = append(processes, line)
		}
	}
	
	return processes
}


// 注册插件
func init() {
	RegisterLocalPlugin("avdetect", func() Plugin {
		return NewAVDetectPlugin()
	})
}