package service

import (
	"context"
	"fmt"
	"regexp"
	"strings"

	"hm-server/app/main/model"

	"github.com/pkg/errors"
	"github.com/zeromicro/go-zero/core/logx"
	"github.com/zeromicro/go-zero/rest"
)

type ApiRegistryService struct {
	adminApiModel model.AdminApiModel
}

func NewApiRegistryService(adminApiModel model.AdminApiModel) *ApiRegistryService {
	return &ApiRegistryService{
		adminApiModel: adminApiModel,
	}
}

// RegisterAllApis 自动注册所有API到数据库
func (s *ApiRegistryService) RegisterAllApis(ctx context.Context, routes []rest.Route) error {
	logx.Infof("开始注册API，共 %d 个路由", len(routes))
	
	registeredCount := 0
	skippedCount := 0
	
	for _, route := range routes {
		// 跳过不需要权限控制的API
		if s.shouldSkipApi(route.Path) {
			skippedCount++
			continue
		}
		
		// 解析API信息
		apiInfo := s.parseRouteToApi(route)
		
		// 检查是否已存在
		existing, err := s.adminApiModel.FindOneByApiCode(ctx, apiInfo.ApiCode)
		if err != nil && !errors.Is(err, model.ErrNotFound) {
			logx.Errorf("查询API失败: %v, apiCode: %s", err, apiInfo.ApiCode)
			continue
		}
		
		// 如果不存在则插入
		if existing == nil {
			_, err = s.adminApiModel.Insert(ctx, nil, apiInfo)
			if err != nil {
				logx.Errorf("插入API失败: %v, apiCode: %s", err, apiInfo.ApiCode)
				continue
			}
			registeredCount++
			logx.Infof("注册API成功: %s %s", apiInfo.Method, apiInfo.Url)
		} else {
			// 如果存在但信息有变化，则更新
			if s.shouldUpdateApi(existing, apiInfo) {
				existing.ApiName = apiInfo.ApiName
				existing.Method = apiInfo.Method
				existing.Url = apiInfo.Url
				existing.Description = apiInfo.Description
				
				_, err = s.adminApiModel.Update(ctx, nil, existing)
				if err != nil {
					logx.Errorf("更新API失败: %v, apiCode: %s", err, apiInfo.ApiCode)
					continue
				}
				logx.Infof("更新API成功: %s %s", apiInfo.Method, apiInfo.Url)
			}
		}
	}
	
	logx.Infof("API注册完成，新增: %d, 跳过: %d", registeredCount, skippedCount)
	return nil
}

// shouldSkipApi 判断是否应该跳过此API
func (s *ApiRegistryService) shouldSkipApi(path string) bool {
	// 跳过公开API
	skipPaths := []string{
		"/api/v1/admin/auth/login", // 登录接口
		"/api/v1/app/",             // 前端应用接口
		"/api/v1/agent/",           // 代理接口
		"/api/v1/user/",            // 用户接口
		"/api/v1/auth/",            // 认证接口
		"/api/v1/notification/",    // 通知接口
		"/api/v1/pay/",             // 支付接口
		"/api/v1/query/",           // 查询接口
		"/api/v1/product/",         // 产品接口
		"/api/v1/authorization/",   // 授权接口
		"/health",                  // 健康检查
	}
	
	for _, skipPath := range skipPaths {
		if strings.HasPrefix(path, skipPath) {
			return true
		}
	}
	
	return false
}

// parseRouteToApi 将路由解析为API信息
func (s *ApiRegistryService) parseRouteToApi(route rest.Route) *model.AdminApi {
	// 生成API编码
	apiCode := s.generateApiCode(route.Method, route.Path)
	
	// 生成API名称
	apiName := s.generateApiName(route.Path)
	
	// 生成描述
	description := s.generateDescription(route.Method, route.Path)
	
	return &model.AdminApi{
		ApiName:     apiName,
		ApiCode:     apiCode,
		Method:      route.Method,
		Url:         route.Path,
		Status:      1, // 默认启用
		Description: description,
	}
}

// generateApiCode 生成API编码
func (s *ApiRegistryService) generateApiCode(method, path string) string {
	// 移除路径参数，如 :id
	cleanPath := regexp.MustCompile(`/:[\w]+`).ReplaceAllString(path, "")
	
	// 转换为小写并替换特殊字符
	apiCode := strings.ToLower(method) + "_" + strings.ReplaceAll(cleanPath, "/", "_")
	apiCode = strings.TrimPrefix(apiCode, "_")
	apiCode = strings.TrimSuffix(apiCode, "_")
	
	return apiCode
}

// generateApiName 生成API名称
func (s *ApiRegistryService) generateApiName(path string) string {
	// 从路径中提取模块和操作
	parts := strings.Split(strings.Trim(path, "/"), "/")
	if len(parts) < 3 {
		return path
	}
	
	// 获取模块名和操作名
	module := parts[len(parts)-2]
	action := parts[len(parts)-1]
	
	// 转换为中文描述
	moduleMap := map[string]string{
		"agent":     "代理管理",
		"auth":      "认证管理",
		"feature":   "功能管理",
		"menu":      "菜单管理",
		"notification": "通知管理",
		"order":     "订单管理",
		"platform_user": "平台用户",
		"product":   "产品管理",
		"promotion": "推广管理",
		"query":     "查询管理",
		"role":      "角色管理",
		"user":      "用户管理",
	}
	
	actionMap := map[string]string{
		"list":      "列表",
		"create":    "创建",
		"update":    "更新",
		"delete":    "删除",
		"detail":    "详情",
		"login":     "登录",
		"config":    "配置",
		"example":   "示例",
		"refund":    "退款",
		"link":      "链接",
		"stats":     "统计",
		"cleanup":   "清理",
		"record":    "记录",
	}
	
	moduleName := moduleMap[module]
	if moduleName == "" {
		moduleName = module
	}
	
	actionName := actionMap[action]
	if actionName == "" {
		actionName = action
	}
	
	return fmt.Sprintf("%s-%s", moduleName, actionName)
}

// generateDescription 生成API描述
func (s *ApiRegistryService) generateDescription(method, path string) string {
	methodMap := map[string]string{
		"GET":    "查询",
		"POST":   "创建",
		"PUT":    "更新",
		"DELETE": "删除",
	}
	
	methodDesc := methodMap[method]
	if methodDesc == "" {
		methodDesc = method
	}
	
	apiName := s.generateApiName(path)
	
	return fmt.Sprintf("%s%s", methodDesc, apiName)
}

// shouldUpdateApi 判断是否需要更新API
func (s *ApiRegistryService) shouldUpdateApi(existing, new *model.AdminApi) bool {
	return existing.ApiName != new.ApiName ||
		existing.Method != new.Method ||
		existing.Url != new.Url ||
		existing.Description != new.Description
}