package core

import (
	"fmt"
	"github.com/shadow1ng/fscan/common"
	"github.com/shadow1ng/fscan/common/i18n"
	"strings"
)

/*
BaseScanStrategy.go - 扫描策略基础类

提供所有扫描策略的通用功能，包括插件管理、验证、
日志输出等，减少代码重复并提升维护性。
*/

// PluginFilterType 插件过滤类型
type PluginFilterType int

const (
	FilterNone    PluginFilterType = iota // 不过滤
	FilterLocal                          // 仅本地插件
	FilterService                        // 仅服务插件（排除本地）
	FilterWeb                            // 仅Web插件
)

// BaseScanStrategy 扫描策略基础类
type BaseScanStrategy struct {
	strategyName string
	filterType   PluginFilterType
}

// NewBaseScanStrategy 创建基础扫描策略
func NewBaseScanStrategy(name string, filterType PluginFilterType) *BaseScanStrategy {
	return &BaseScanStrategy{
		strategyName: name,
		filterType:   filterType,
	}
}

// =============================================================================
// 插件管理通用方法
// =============================================================================

// GetPlugins 获取插件列表（通用实现）
func (b *BaseScanStrategy) GetPlugins() ([]string, bool) {
	// 如果指定了特定插件且不是"all"
	if common.ScanMode != "" && common.ScanMode != "all" {
		requestedPlugins := parsePluginList(common.ScanMode)
		if len(requestedPlugins) == 0 {
			requestedPlugins = []string{common.ScanMode}
		}

		// 验证插件是否存在
		var validPlugins []string
		for _, name := range requestedPlugins {
			if _, exists := common.PluginManager[name]; exists {
				validPlugins = append(validPlugins, name)
			}
		}

		return validPlugins, true
	}

	// 未指定或使用"all"：获取所有插件，由IsPluginApplicable做类型过滤
	return GetAllPlugins(), false
}

// GetApplicablePlugins 获取适用的插件列表（用于日志显示）
func (b *BaseScanStrategy) GetApplicablePlugins(allPlugins []string, isCustomMode bool) []string {
	if isCustomMode {
		return allPlugins
	}

	var applicablePlugins []string
	for _, pluginName := range allPlugins {
		plugin, exists := common.PluginManager[pluginName]
		if !exists {
			continue
		}

		if b.isPluginTypeMatched(plugin) {
			applicablePlugins = append(applicablePlugins, pluginName)
		}
	}

	return applicablePlugins
}

// isPluginTypeMatched 检查插件类型是否匹配过滤器
func (b *BaseScanStrategy) isPluginTypeMatched(plugin common.ScanPlugin) bool {
	switch b.filterType {
	case FilterLocal:
		return plugin.HasType(common.PluginTypeLocal)
	case FilterService:
		return !plugin.HasType(common.PluginTypeLocal)
	case FilterWeb:
		return plugin.HasType(common.PluginTypeWeb)
	default:
		return true
	}
}

// IsPluginApplicable 判断插件是否适用（通用实现）
func (b *BaseScanStrategy) IsPluginApplicable(plugin common.ScanPlugin, targetPort int, isCustomMode bool) bool {
	// 自定义模式下运行所有明确指定的插件
	if isCustomMode {
		return true
	}

	// 检查插件类型过滤
	if !b.isPluginTypeMatched(plugin) {
		return false
	}

	// 对于服务扫描，还需检查端口匹配
	if b.filterType == FilterService {
		// 无端口限制的插件适用于所有端口
		if len(plugin.Ports) == 0 {
			return true
		}
		// 有端口限制的插件：检查端口是否匹配
		if targetPort > 0 {
			return plugin.HasPort(targetPort)
		}
		// 如果没有提供目标端口，则不执行有端口限制的插件
		return false
	}

	return true
}

// =============================================================================
// 日志输出通用方法
// =============================================================================

// LogPluginInfo 输出插件信息（通用实现）
func (b *BaseScanStrategy) LogPluginInfo() {
	allPlugins, isCustomMode := b.GetPlugins()
	applicablePlugins := b.GetApplicablePlugins(allPlugins, isCustomMode)

	// 生成日志消息
	var messageKey, prefix string
	switch b.filterType {
	case FilterLocal:
		messageKey = "scan_plugins_local"
		prefix = i18n.GetText("scan_mode_local_prefix")
	case FilterService:
		messageKey = "scan_plugins_service" 
		prefix = i18n.GetText("scan_mode_service_prefix")
	case FilterWeb:
		messageKey = "scan_plugins_web"
		prefix = i18n.GetText("scan_mode_web_prefix")
	default:
		messageKey = "scan_plugins_custom"
		prefix = ""
	}

	if len(applicablePlugins) > 0 {
		if isCustomMode {
			common.LogBase(fmt.Sprintf("%s: %s", prefix, 
				i18n.GetText("scan_plugins_custom_specified", strings.Join(applicablePlugins, ", "))))
		} else {
			common.LogBase(fmt.Sprintf("%s: %s", prefix,
				i18n.GetText(messageKey, strings.Join(applicablePlugins, ", "))))
		}
	} else {
		noPluginsKey := fmt.Sprintf("scan_no_%s_plugins", b.getFilterTypeName())
		common.LogBase(fmt.Sprintf("%s: %s", prefix, i18n.GetText(noPluginsKey)))
	}
}

// getFilterTypeName 获取过滤器类型名称
func (b *BaseScanStrategy) getFilterTypeName() string {
	switch b.filterType {
	case FilterLocal:
		return "local"
	case FilterService:
		return "service"
	case FilterWeb:
		return "web"
	default:
		return "general"
	}
}

// =============================================================================
// 验证通用方法
// =============================================================================

// ValidateConfiguration 验证扫描配置（通用实现）
func (b *BaseScanStrategy) ValidateConfiguration() error {
	return validateScanPlugins()
}

// =============================================================================
// 通用辅助方法
// =============================================================================

// LogScanStart 输出扫描开始信息
func (b *BaseScanStrategy) LogScanStart() {
	switch b.filterType {
	case FilterLocal:
		common.LogBase(i18n.GetText("scan_local_start"))
	case FilterService:
		common.LogBase(i18n.GetText("scan_service_start"))
	case FilterWeb:
		common.LogBase(i18n.GetText("scan_web_start"))
	default:
		common.LogBase(i18n.GetText("scan_general_start"))
	}
}