package handler

import (
	"encoding/json"

	"github.com/asaskevich/govalidator"
	"github.com/portainer/portainer"
	httperror "github.com/portainer/portainer/http/error"
	"github.com/portainer/portainer/http/security"

	"log"
	"net/http"
	"os"

	"github.com/gorilla/mux"
)

// SettingsHandler represents an HTTP API handler for managing Settings.
type SettingsHandler struct {
	*mux.Router
	Logger          *log.Logger
	SettingsService portainer.SettingsService
}

// NewSettingsHandler returns a new instance of OldSettingsHandler.
func NewSettingsHandler(bouncer *security.RequestBouncer) *SettingsHandler {
	h := &SettingsHandler{
		Router: mux.NewRouter(),
		Logger: log.New(os.Stderr, "", log.LstdFlags),
	}
	h.Handle("/settings",
		bouncer.PublicAccess(http.HandlerFunc(h.handleGetSettings))).Methods(http.MethodGet)
	h.Handle("/settings",
		bouncer.AdministratorAccess(http.HandlerFunc(h.handlePutSettings))).Methods(http.MethodPut)

	return h
}

// handleGetSettings handles GET requests on /settings
func (handler *SettingsHandler) handleGetSettings(w http.ResponseWriter, r *http.Request) {
	settings, err := handler.SettingsService.Settings()
	if err != nil {
		httperror.WriteErrorResponse(w, err, http.StatusInternalServerError, handler.Logger)
		return
	}

	encodeJSON(w, settings, handler.Logger)
	return
}

// handlePutSettings handles PUT requests on /settings
func (handler *SettingsHandler) handlePutSettings(w http.ResponseWriter, r *http.Request) {
	var req putSettingsRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		httperror.WriteErrorResponse(w, ErrInvalidJSON, http.StatusBadRequest, handler.Logger)
		return
	}

	_, err := govalidator.ValidateStruct(req)
	if err != nil {
		httperror.WriteErrorResponse(w, ErrInvalidRequestFormat, http.StatusBadRequest, handler.Logger)
		return
	}

	settings := &portainer.Settings{
		TemplatesURL:                req.TemplatesURL,
		LogoURL:                     req.LogoURL,
		BlackListedLabels:           req.BlackListedLabels,
		DisplayExternalContributors: req.DisplayExternalContributors,
	}

	err = handler.SettingsService.StoreSettings(settings)
	if err != nil {
		httperror.WriteErrorResponse(w, err, http.StatusInternalServerError, handler.Logger)
	}
}

type putSettingsRequest struct {
	TemplatesURL                string           `valid:"required"`
	LogoURL                     string           `valid:""`
	BlackListedLabels           []portainer.Pair `valid:""`
	DisplayExternalContributors bool             `valid:""`
}