package handler

import (
	"fmt"

	http2 "net/http"

	"git.ikuban.com/server/kratos-utils/v2/transport/middleware"
	ku_annotations "git.ikuban.com/server/kubanapis/kuban/api/annotations"
	"github.com/go-kratos/kratos/v2/transport/http"
	openapi_v3 "github.com/google/gnostic/openapiv3"
	"github.com/jhump/protoreflect/desc"
	"github.com/jhump/protoreflect/grpcreflect"
	"google.golang.org/genproto/googleapis/api/annotations"
	"google.golang.org/grpc"
	"google.golang.org/protobuf/proto"
)

func RegisterRoute(s *http.Server, srv any, svcDesc grpc.ServiceDesc) {
	r := s.Route("/")

	// 加载完整的服务描述符
	fullSvcDesc, err := grpcreflect.LoadServiceDescriptor(&svcDesc)
	if err != nil {
		panic(fmt.Sprintf("加载服务描述符失败 err:%v", err))
	}

	// 注册一元方法handler
	for _, md := range svcDesc.Methods {
		// 获取方法option
		option := GetOptionByServiceDescriptor(fullSvcDesc, svcDesc.ServiceName, md.MethodName)
		// 跳过不需要生成http方法的
		if !option.GenHttp {
			continue
		}
		// 注册http接口
		r.Handle(option.Method, option.Path, unaryHandler(srv, md, option))
	}

	// 注册流式方法handler
	for _, std := range svcDesc.Streams {

		// 获取方法option
		option := GetOptionByServiceDescriptor(fullSvcDesc, svcDesc.ServiceName, std.StreamName)
		// 跳过不需要生成http方法的
		if !option.GenHttp {
			continue
		}

		switch {
		case std.ClientStreams && std.ServerStreams:
			// 双向流

		case std.ClientStreams && !std.ServerStreams:
			// 客户端流

		case !std.ClientStreams && std.ServerStreams:
			// 服务端流
			r.POST(option.Path, serverStreamHandler(srv, std, option))
		}
	}
}

func GetOptionByServiceDescriptor(sd *desc.ServiceDescriptor, serviceName, methodName string) *middleware.Option {
	// 获取方法描述符
	md := sd.FindMethodByName(methodName)
	if md == nil {
		panic(fmt.Sprintf("未找到方法描述符 service:%v, method:%v", serviceName, methodName))
	}

	// option
	option := &middleware.Option{}

	// 获取方法option
	methodOptions := md.GetMethodOptions()
	operation := proto.GetExtension(methodOptions, openapi_v3.E_Operation).(*openapi_v3.Operation)
	if operation == nil {
		// 跳过不需要生成http方法的
		option.GenHttp = false
		return option
	}
	option.GenHttp = true

	// 不需要认证的
	if len(operation.Security) == 0 {
		option.NotAuth = true
	} else {
		if len(operation.Security[0].AdditionalProperties) != 0 {
			option.AuthorizationsName = operation.Security[0].AdditionalProperties[0].Name
		}
	}
	// 解析自定义option [操作记录]
	customOptions := proto.GetExtension(methodOptions, ku_annotations.E_Options).(*ku_annotations.Options)
	if customOptions.GetOperationRecord().GetEnabled() {
		option.OperationRecord = true
	}

	// 路由
	rule := proto.GetExtension(methodOptions, annotations.E_Http).(*annotations.HttpRule)
	if rule != nil {
		switch httpRule := rule.GetPattern().(type) {
		case *annotations.HttpRule_Post:
			option.Path = httpRule.Post
			option.Method = http2.MethodPost
		case *annotations.HttpRule_Get:
			option.Path = httpRule.Get
			option.Method = http2.MethodGet
		case *annotations.HttpRule_Delete:
			option.Path = httpRule.Delete
			option.Method = http2.MethodDelete
		case *annotations.HttpRule_Put:
			option.Path = httpRule.Put
			option.Method = http2.MethodPut
		}
	}
	if option.Path == "" {
		option.Path = pathGenerator(serviceName, methodName)
	}
	if option.Method == "" {
		option.Method = http2.MethodPost
	}

	return option
}