package services

import (
	"context"
	"fmt"

	ldaplib "github.com/go-ldap/ldap/v3"
	"github.com/shadow1ng/fscan/common"
	"github.com/shadow1ng/fscan/plugins"
)

type LDAPPlugin struct {
	plugins.BasePlugin
}

func NewLDAPPlugin() *LDAPPlugin {
	return &LDAPPlugin{
		BasePlugin: plugins.NewBasePlugin("ldap"),
	}
}

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

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

	credentials := plugins.GenerateCredentials("ldap")
	
	for _, cred := range credentials {
		// 检查上下文是否已取消
		select {
		case <-ctx.Done():
			return &plugins.Result{
				Success: false,
				Service: "ldap",
				Error:   ctx.Err(),
			}
		default:
		}

		if p.testCredential(ctx, info, cred) {
			common.LogSuccess(fmt.Sprintf("LDAP %s %s:%s", target, cred.Username, cred.Password))
			return &plugins.Result{
				Success:  true,
				Service:  "ldap",
				Username: cred.Username,
				Password: cred.Password,
			}
		}
	}

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

func (p *LDAPPlugin) testCredential(ctx context.Context, info *common.HostInfo, cred plugins.Credential) bool {
	conn, err := p.connectLDAP(ctx, info, cred)
	if err != nil {
		return false
	}
	defer conn.Close()

	// 尝试多种DN格式进行绑定测试
	dnFormats := []string{
		fmt.Sprintf("cn=%s,dc=example,dc=com", cred.Username),          // 标准格式
		fmt.Sprintf("uid=%s,dc=example,dc=com", cred.Username),         // uid格式
		fmt.Sprintf("cn=%s,ou=users,dc=example,dc=com", cred.Username), // ou格式
		cred.Username, // 直接用户名（某些配置）
	}

	for _, dn := range dnFormats {
		if err := conn.Bind(dn, cred.Password); err == nil {
			common.LogDebug(fmt.Sprintf("LDAP绑定成功，DN: %s", dn))
			return true
		}
		common.LogDebug(fmt.Sprintf("LDAP绑定失败，DN: %s, 错误: %v", dn, err))
	}
	return false
}

func (p *LDAPPlugin) connectLDAP(ctx context.Context, info *common.HostInfo, creds plugins.Credential) (*ldaplib.Conn, error) {
	target := fmt.Sprintf("%s:%s", info.Host, info.Ports)
	
	if info.Ports == "636" {
		return ldaplib.DialTLS("tcp", target, nil)
	}
	return ldaplib.Dial("tcp", target)
}

func (p *LDAPPlugin) identifyService(ctx context.Context, info *common.HostInfo) *plugins.Result {
	target := fmt.Sprintf("%s:%s", info.Host, info.Ports)

	conn, err := p.connectLDAP(ctx, info, plugins.Credential{})
	if err != nil {
		return &plugins.Result{
			Success: false,
			Service: "ldap",
			Error:   err,
		}
	}
	defer conn.Close()

	banner := "LDAP"
	common.LogSuccess(fmt.Sprintf("LDAP %s %s", target, banner))
	return &plugins.Result{
		Success: true,
		Service: "ldap",
		Banner:  banner,
	}
}

func init() {
	plugins.RegisterWithPorts("ldap", func() plugins.Plugin {
		return NewLDAPPlugin()
	}, []int{389, 636, 3268, 3269})
}