package app

import (
	"fmt"
	"log"
	"reflect"

	"git.loafle.net/loafer/di-go"
	appAnnotation "git.loafle.net/totopia/server/pkg/loafer/app/annotation"
	webAnnotation "git.loafle.net/totopia/server/pkg/loafer/web/annotation"
	"github.com/buaazp/fasthttprouter"
	"github.com/valyala/fasthttp"
)

type MethodMapping struct {
	Method    string
	ParamKeys []string
}

func Run(t reflect.Type) error {
	taServer := di.GetTypeAnnotation(t, appAnnotation.ServerAnnotationType)
	if nil == taServer {
		return fmt.Errorf("[%s] is not Server, use @app:Server", t.Elem().Name())

	}
	aServer := taServer.(*appAnnotation.ServerAnnotation)
	log.Printf("%s %d", t.Elem().Name(), aServer.HTTPPort)

	restHandlers, err := di.GetInstancesByAnnotationType(webAnnotation.RestHandlerAnnotationType)
	if nil != err {
		return fmt.Errorf("[%v]", err)
	}

	for _, restHandler := range restHandlers {
		parseRestHandler(restHandler)
		parseRequestMapping(restHandler)
	}

	router := fasthttprouter.New()
	if err := fasthttp.ListenAndServe(fmt.Sprintf(":%d", aServer.HTTPPort), router.Handler); nil != err {
		return err
	}

	return nil
}

func parseRestHandler(restHandler interface{}) {
	t := reflect.TypeOf(restHandler)
	ta := di.GetTypeAnnotation(t, webAnnotation.RestHandlerAnnotationType)
	if nil == ta {
		log.Printf("Service[%s] is not RESTService, use @RESTService", t.Elem().Name())
		return
	}
	log.Printf("%s %v", t.Elem().Name(), ta)
}

func parseRequestMapping(restHandler interface{}) {
	t := reflect.TypeOf(restHandler)
	mas := di.GetMethodAnnotations(t, webAnnotation.RequestMappingAnnotationType)
	if nil == mas || 0 == len(mas) {
		return
	}

	methodMapping := make(map[string]map[string]*MethodMapping)

	for methodName, v := range mas {
		ma := v.(*webAnnotation.RequestMappingAnnotation)
		mm, ok := methodMapping[ma.Method]
		if !ok {
			mm = make(map[string]*MethodMapping)
			methodMapping[ma.Method] = mm
		}

		_, ok = mm[ma.Entry]
		if ok {
			log.Printf("Mapping of method[%s], entry[%s] is exist already", ma.Method, ma.Entry)
			continue
		}

		mm[ma.Entry] = &MethodMapping{
			Method: fmt.Sprintf("%s.%s", t.Elem().Name(), methodName),
		}
	}

	log.Printf("%s %v", t.Elem().Name(), methodMapping)
}