package greet

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

	"github.com/go-chi/chi/v5"
)

type Greeter interface {
	Greet(name string) string
}

type ApiV1Greet interface {
	RegisterRoutes(router chi.Router)
}

type apiV1GreetHandler struct {
	greeter Greeter
}

func NewApiV1GreetHandler(greeter Greeter) ApiV1Greet {
	return &apiV1GreetHandler{greeter: greeter}
}

func (h *apiV1GreetHandler) RegisterRoutes(router chi.Router) {
	router.Get("/", h.handleGreetQuery)
	router.Get("/{name}", h.handleGreetPath)
}

func (h *apiV1GreetHandler) handleGreetQuery(w http.ResponseWriter, r *http.Request) {
	name := r.URL.Query().Get("name")
	h.writeJSONResponse(w, h.greeter.Greet(name))
}

func (h *apiV1GreetHandler) handleGreetPath(w http.ResponseWriter, r *http.Request) {
	name := chi.URLParam(r, "name")
	h.writeJSONResponse(w, h.greeter.Greet(name))
}

func (h *apiV1GreetHandler) writeJSONResponse(w http.ResponseWriter, message string) {
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]string{"message": message})
}