package api

import (
	"encoding/json"
	"net/http"
	"sort"
	"strconv"

	"github.com/containous/mux"
	"github.com/containous/traefik/pkg/config/runtime"
	"github.com/containous/traefik/pkg/log"
)

type tcpRouterRepresentation struct {
	*runtime.TCPRouterInfo
	Name     string `json:"name,omitempty"`
	Provider string `json:"provider,omitempty"`
}

type tcpServiceRepresentation struct {
	*runtime.TCPServiceInfo
	Name     string `json:"name,omitempty"`
	Provider string `json:"provider,omitempty"`
}

func (h Handler) getTCPRouters(rw http.ResponseWriter, request *http.Request) {
	results := make([]tcpRouterRepresentation, 0, len(h.runtimeConfiguration.TCPRouters))

	for name, rt := range h.runtimeConfiguration.TCPRouters {
		results = append(results, tcpRouterRepresentation{
			TCPRouterInfo: rt,
			Name:          name,
			Provider:      getProviderName(name),
		})
	}

	sort.Slice(results, func(i, j int) bool {
		return results[i].Name < results[j].Name
	})

	pageInfo, err := pagination(request, len(results))
	if err != nil {
		http.Error(rw, err.Error(), http.StatusBadRequest)
		return
	}

	rw.Header().Set("Content-Type", "application/json")
	rw.Header().Set(nextPageHeader, strconv.Itoa(pageInfo.nextPage))

	err = json.NewEncoder(rw).Encode(results[pageInfo.startIndex:pageInfo.endIndex])
	if err != nil {
		log.FromContext(request.Context()).Error(err)
		http.Error(rw, err.Error(), http.StatusInternalServerError)
	}
}

func (h Handler) getTCPRouter(rw http.ResponseWriter, request *http.Request) {
	routerID := mux.Vars(request)["routerID"]

	router, ok := h.runtimeConfiguration.TCPRouters[routerID]
	if !ok {
		http.NotFound(rw, request)
		return
	}

	result := tcpRouterRepresentation{
		TCPRouterInfo: router,
		Name:          routerID,
		Provider:      getProviderName(routerID),
	}

	rw.Header().Set("Content-Type", "application/json")

	err := json.NewEncoder(rw).Encode(result)
	if err != nil {
		log.FromContext(request.Context()).Error(err)
		http.Error(rw, err.Error(), http.StatusInternalServerError)
	}
}

func (h Handler) getTCPServices(rw http.ResponseWriter, request *http.Request) {
	results := make([]tcpServiceRepresentation, 0, len(h.runtimeConfiguration.TCPServices))

	for name, si := range h.runtimeConfiguration.TCPServices {
		results = append(results, tcpServiceRepresentation{
			TCPServiceInfo: si,
			Name:           name,
			Provider:       getProviderName(name),
		})
	}

	sort.Slice(results, func(i, j int) bool {
		return results[i].Name < results[j].Name
	})

	pageInfo, err := pagination(request, len(results))
	if err != nil {
		http.Error(rw, err.Error(), http.StatusBadRequest)
		return
	}

	rw.Header().Set("Content-Type", "application/json")
	rw.Header().Set(nextPageHeader, strconv.Itoa(pageInfo.nextPage))

	err = json.NewEncoder(rw).Encode(results[pageInfo.startIndex:pageInfo.endIndex])
	if err != nil {
		log.FromContext(request.Context()).Error(err)
		http.Error(rw, err.Error(), http.StatusInternalServerError)
	}
}

func (h Handler) getTCPService(rw http.ResponseWriter, request *http.Request) {
	serviceID := mux.Vars(request)["serviceID"]

	service, ok := h.runtimeConfiguration.TCPServices[serviceID]
	if !ok {
		http.NotFound(rw, request)
		return
	}

	result := tcpServiceRepresentation{
		TCPServiceInfo: service,
		Name:           serviceID,
		Provider:       getProviderName(serviceID),
	}

	rw.Header().Set("Content-Type", "application/json")

	err := json.NewEncoder(rw).Encode(result)
	if err != nil {
		log.FromContext(request.Context()).Error(err)
		http.Error(rw, err.Error(), http.StatusInternalServerError)
	}
}