package config

import (
	"encoding/json"
	"fmt"
	"network-topology-discovery/pkg/models"
	"os"
)

// Config 应用配置
type Config struct {
	ScanRanges []string       `json:"scan_ranges"`
	Devices    []DeviceConfig `json:"devices"`
	SSH        SSHConfig      `json:"ssh"`
	Web        WebConfig      `json:"web"`
	Scanner    ScannerConfig  `json:"scanner"`
	Auth       AuthConfig     `json:"auth"`
}

// DeviceConfig 设备配置
type DeviceConfig struct {
	IP       string            `json:"ip"`
	Type     models.DeviceType `json:"type"`
	Username string            `json:"username"`
	Password string            `json:"password"`
	KeyFile  string            `json:"key_file"`
	Port     int               `json:"port"`
}

// SSHConfig SSH配置
type SSHConfig struct {
	Timeout    int `json:"timeout"`
	MaxRetries int `json:"max_retries"`
	Port       int `json:"port"`
}

// WebConfig Web服务配置
type WebConfig struct {
	Port int    `json:"port"`
	Host string `json:"host"`
}

// AuthConfig 认证配置
type AuthConfig struct {
	Enabled  bool   `json:"enabled"`
	Username string `json:"username"`
	Password string `json:"password"`
}

// ScannerConfig 扫描器配置
type ScannerConfig struct {
	Concurrency int `json:"concurrency"`
	Timeout     int `json:"timeout"`
}

// LoadConfig 从文件加载配置
func LoadConfig(filename string) (*Config, error) {
	data, err := os.ReadFile(filename)
	if err != nil {
		return nil, fmt.Errorf("failed to read config file: %w", err)
	}

	var config Config
	if err := json.Unmarshal(data, &config); err != nil {
		return nil, fmt.Errorf("failed to parse config file: %w", err)
	}

	// 设置默认值
	config.setDefaults()

	return &config, nil
}

// SaveConfig 保存配置到文件
func SaveConfig(filename string, config *Config) error {
	data, err := json.MarshalIndent(config, "", "  ")
	if err != nil {
		return fmt.Errorf("failed to marshal config: %w", err)
	}

	if err := os.WriteFile(filename, data, 0644); err != nil {
		return fmt.Errorf("failed to write config file: %w", err)
	}

	return nil
}

// DefaultConfig 返回默认配置
func DefaultConfig() *Config {
	config := &Config{
		ScanRanges: []string{},
		Devices:    []DeviceConfig{},
		SSH: SSHConfig{
			Timeout:    10,
			MaxRetries: 3,
			Port:       22,
		},
		Web: WebConfig{
			Port: 8080,
			Host: "0.0.0.0",
		},
		Scanner: ScannerConfig{
			Concurrency: 10,
			Timeout:     2,
		},
	}
	return config
}

// setDefaults 设置默认值
func (c *Config) setDefaults() {
	if c.SSH.Timeout == 0 {
		c.SSH.Timeout = 10
	}
	if c.SSH.MaxRetries == 0 {
		c.SSH.MaxRetries = 3
	}
	if c.SSH.Port == 0 {
		c.SSH.Port = 22
	}
	if c.Web.Port == 0 {
		c.Web.Port = 8080
	}
	if c.Web.Host == "" {
		c.Web.Host = "0.0.0.0"
	}
	if c.Scanner.Concurrency == 0 {
		c.Scanner.Concurrency = 10
	}
	if c.Scanner.Timeout == 0 {
		c.Scanner.Timeout = 2
	}
	if c.Auth.Enabled && c.Auth.Username == "" {
		c.Auth.Username = "admin"
	}
	if c.Auth.Enabled && c.Auth.Password == "" {
		c.Auth.Password = "admin"
	}
}