package device

import (
	"fmt"
	"time"
	"network-topology-discovery/pkg/models"
	sshclient "network-topology-discovery/internal/ssh"
)

// Parser 设备解析器接口
type Parser interface {
	// GetCommands 获取需要执行的命令列表
	GetCommands() []string
	
	// Parse 解析命令输出,填充设备信息
	Parse(device *models.Device, outputs []string) error
	
	// GetType 获取设备类型
	GetType() models.DeviceType
}

// BaseParser 基础解析器
type BaseParser struct {
	DeviceType models.DeviceType
}

// GetType 获取设备类型
func (b *BaseParser) GetType() models.DeviceType {
	return b.DeviceType
}

// DiscoverDevice 发现并采集设备信息
func DiscoverDevice(ip string, deviceType models.DeviceType, username, password string) (*models.Device, error) {
	device := &models.Device{
		IP:   ip,
		Type: deviceType,
	}

	// 创建SSH客户端 - 默认启用不安全加密算法以兼容老旧设备，增加超时时间
	client := sshclient.NewClient(sshclient.Config{
		Host:             ip,
		Username:         username,
		Password:         password,
		Timeout:          30 * time.Second, // 增加到30秒，防止大输出超时
		InsecureCiphers:  true, // 启用旧版加密算法支持
	})

	// 连接
	if err := client.Connect(); err != nil {
		device.ScanStatus = "failed"
		device.ErrorMessage = err.Error()
		return device, err
	}
	defer client.Close()

	// 获取对应的解析器
	var parser Parser
	switch deviceType {
	case models.DeviceTypeCisco:
		parser = &CiscoParser{}
	case models.DeviceTypeHuawei:
		parser = &HuaweiParser{}
	case models.DeviceTypeH3C:
		parser = &H3CParser{}
	case models.DeviceTypeASA:
		parser = &ASAParser{}
	case models.DeviceTypeLinux:
		parser = &LinuxParser{}
	case models.DeviceTypeWindows:
		parser = &WindowsParser{}
	default:
		device.ScanStatus = "failed"
		device.ErrorMessage = "unsupported device type"
		return device, nil
	}

	// 获取命令列表
	commands := parser.GetCommands()

	// 执行所有命令（使用Shell模式，在同一个会话中顺序执行）
	outputs, err := client.ExecuteCommands(commands)
	if err != nil {
		device.ScanStatus = "failed"
		device.ErrorMessage = err.Error()
		return device, err
	}

	// 打印调试信息
	for i, output := range outputs {
		fmt.Printf("[PARSER] Command %d/%d returned %d bytes\n", i+1, len(commands), len(output))
	}

	// 解析输出
	if err := parser.Parse(device, outputs); err != nil {
		device.ScanStatus = "failed"
		device.ErrorMessage = err.Error()
		return device, err
	}

	device.ScanStatus = "success"
	return device, nil
}