package router

import (
	"encoding/json"
	"io/fs"
	"net/http"
	"net/url"

	"git.0cd.xyz/michael/gtools/logger"
	"git.0cd.xyz/michael/gtools/tpl"

	"github.com/gorilla/mux"
)

// Router Configuration
type Router struct {
	router  *mux.Router
	tplopts *tpl.Options
	page    interface{}
	logger  *logger.Logger
	fsys    fs.FS
}

// NewRouter instance of new router
func NewRouter(tplopts *tpl.Options, page interface{}, logger *logger.Logger, fsys fs.FS) *Router {
	return &Router{
		router:  mux.NewRouter(),
		tplopts: tplopts,
		page:    page,
		logger:  logger,
		fsys:    fsys,
	}
}

// Router returns router
func (re *Router) Router() *mux.Router {
	return re.router
}

// Response HTTP Response
type Response struct {
	Title   string
	Vars    map[string]string
	Query   url.Values
	Session map[interface{}]interface{}
	Body    interface{}
	Status  Status
}

// Status HTTP Status Code
type Status struct {
	Status     string
	StatusCode int
}

// HandlerFunc custom handler function that passes errors
type HandlerFunc func(w http.ResponseWriter, r *http.Request) error

func (f HandlerFunc) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	f(w, r)
}

// Response handles http respondes
func (re *Router) Response(resp *Response, statuscode int) HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) error {
		re.logger.AccessMessage(r, statuscode)
		if statuscode >= 200 && statuscode <= 299 {
			re.RenderTemplate(resp).ServeHTTP(w, r)
			return nil
		}
		return HTTPError(statuscode, nil)
	}
}

// Respond responds with data json
func (re *Router) Respond(data interface{}, status int) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		re.logger.AccessMessage(r, status)
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(status)
		if data != nil {
			if err := json.NewEncoder(w).Encode(data); err != nil {
				re.logger.Error.Errorf("faield to encode a response: %v", err)
				http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
			}
		}
	}
}