package app

import (
	"encoding/json"
	"log"
	"net/http"
	"time"
)

// ---------------------------------------------------------------------
// HTTP helpers
// ---------------------------------------------------------------------

// EN: Common HTTP helpers used by all endpoint groups for consistent JSON output,
// EN: lightweight request timing logs, and health probing.
// RU: Общие HTTP-хелперы для всех групп эндпоинтов: единый JSON-ответ,
// RU: лёгкое логирование длительности запросов и health-check.

// ---------------------------------------------------------------------
// request logging
// ---------------------------------------------------------------------

func logRequests(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		start := time.Now()
		next.ServeHTTP(w, r)
		log.Printf("%s %s %s", r.Method, r.URL.Path, time.Since(start))
	})
}

// ---------------------------------------------------------------------
// JSON response helper
// ---------------------------------------------------------------------

func writeJSON(w http.ResponseWriter, status int, v any) {
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.WriteHeader(status)
	if v == nil {
		return
	}
	if err := json.NewEncoder(w).Encode(v); err != nil {
		log.Printf("writeJSON error: %v", err)
	}
}

// ---------------------------------------------------------------------
// health endpoint
// ---------------------------------------------------------------------

func handleHealthz(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		return
	}
	writeJSON(w, http.StatusOK, map[string]string{
		"status": "ok",
		"time":   time.Now().Format(time.RFC3339),
	})
}