package services

import (
	"context"
	"fmt"
	"time"

	ftplib "github.com/jlaffaye/ftp"
	"github.com/shadow1ng/fscan/common"
)

type FTPPlugin struct {
	name  string
	ports []int
}

func NewFTPPlugin() *FTPPlugin {
	return &FTPPlugin{
		name:  "ftp",
		ports: []int{21, 2121, 990},
	}
}

func (p *FTPPlugin) Name() string {
	return p.name
}

func (p *FTPPlugin) GetPorts() []int {
	return p.ports
}

func (p *FTPPlugin) Scan(ctx context.Context, info *common.HostInfo) *ScanResult {
	target := fmt.Sprintf("%s:%s", info.Host, info.Ports)

	if common.DisableBrute {
		return p.identifyService(info)
	}

	credentials := GenerateCredentials("ftp")
	if len(credentials) == 0 {
		return &ScanResult{
			Success: false,
			Service: "ftp",
			Error:   fmt.Errorf("没有可用的测试凭据"),
		}
	}

	for _, cred := range credentials {
		if conn := p.testCredential(ctx, info, cred); conn != nil {
			conn.Quit()
			common.LogSuccess(fmt.Sprintf("FTP %s %s:%s", target, cred.Username, cred.Password))
			return &ScanResult{
				Success:  true,
				Service:  "ftp",
				Username: cred.Username,
				Password: cred.Password,
			}
		}
	}

	return &ScanResult{
		Success: false,
		Service: "ftp",
		Error:   fmt.Errorf("未发现弱密码"),
	}
}


func (p *FTPPlugin) testCredential(ctx context.Context, info *common.HostInfo, cred Credential) *ftplib.ServerConn {
	target := fmt.Sprintf("%s:%s", info.Host, info.Ports)
	timeout := time.Duration(common.Timeout) * time.Second

	conn, err := ftplib.DialTimeout(target, timeout)
	if err != nil {
		return nil
	}

	err = conn.Login(cred.Username, cred.Password)
	if err != nil {
		conn.Quit()
		return nil
	}

	return conn
}



func (p *FTPPlugin) identifyService(info *common.HostInfo) *ScanResult {
	target := fmt.Sprintf("%s:%s", info.Host, info.Ports)
	timeout := time.Duration(common.Timeout) * time.Second

	conn, err := ftplib.DialTimeout(target, timeout)
	if err != nil {
		return &ScanResult{
			Success: false,
			Service: "ftp",
			Error:   err,
		}
	}
	defer conn.Quit()

	banner := "FTP"
	common.LogSuccess(fmt.Sprintf("FTP %s %s", target, banner))
	return &ScanResult{
		Success: true,
		Service: "ftp",
		Banner:  banner,
	}
}

func init() {
	// 使用高效注册方式：直接传递端口信息，避免实例创建
	RegisterPluginWithPorts("ftp", func() Plugin {
		return NewFTPPlugin()
	}, []int{21, 2121, 990})
}