package gin

import (
	"net/http"
	"strings"

	"github.com/gin-contrib/cors"
	"github.com/gin-gonic/gin"
	. "github.com/rpcxio/rpcx-gateway"
)

type Server struct {
	addr string
	g    *gin.Engine
}

// New returns a server.
func New(addr string) *Server {
	return &Server{
		addr: addr,
	}
}

// NewWithGin returns a server with preconfigured gin.
func NewWithGin(addr string, g *gin.Engine) *Server {
	return &Server{
		addr: addr,
		g:    g,
	}
}

// RegisterHandler configures the handler to handle http rpcx invoke.
// It wraps ServiceHandler into httprouter.Handle.
func (s *Server) RegisterHandler(base string, handler ServiceHandler) {
	g := s.g
	if g == nil {
		gin.SetMode(gin.ReleaseMode) // 设备为生产模式 add by sunmiao
		g = gin.Default()

		// 添加CORS处理 add by sunmiao
		config := cors.DefaultConfig()
		config.AllowAllOrigins = true
		config.AllowHeaders = []string{"Origin", "Content-Length", "Content-Type", "Authorization","Tenant","X-RPCX-SerializeType", "X-RPCX-ServiceMethod", "X-RPCX-ServicePath", "X-RPCX-Meta"}
		g.Use(cors.New(config))
	}
	h := wrapServiceHandler(handler)

	g.POST(base, h)
	// 只开放POST edit by sunmiao
	//g.GET(base, h)
	//g.PUT(base, h)

	s.g = g
}

func wrapServiceHandler(handler ServiceHandler) gin.HandlerFunc {
	return func(ctx *gin.Context) {
		r := ctx.Request
		w := ctx.Writer
		if r.Header.Get(XServicePath) == "" {
			servicePath := ctx.Param("servicePath")
			if strings.HasPrefix(servicePath, "/") {
				servicePath = servicePath[1:]
			}

			r.Header.Set(XServicePath, servicePath)
		}

		servicePath := r.Header.Get(XServicePath)
		messageID := r.Header.Get(XMessageID)
		wh := w.Header()
		if messageID != "" {
			wh.Set(XMessageID, messageID)
		}

		meta, payload, err := handler(r, servicePath)
		for k, v := range meta {
			wh.Set(k, v)
		}

		if err == nil {
			ctx.Data(http.StatusOK, "application/octet-stream", payload)
			return
		}

		rh := r.Header
		for k, v := range rh {
			if strings.HasPrefix(k, "X-RPCX-") && len(v) > 0 {
				wh.Set(k, v[0])
			}
		}

		wh.Set(XMessageStatusType, "Error")
		wh.Set(XErrorMessage, err.Error())
		ctx.String(http.StatusOK, err.Error())
	}
}

func (s *Server) Serve() error {
	return s.g.Run(s.addr)
}