package api

import (
	"encoding/json"
	"net/http"
	"strconv"
	"strings"
)

// Response helpers

func respondJSON(w http.ResponseWriter, status int, data interface{}) {
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(status)
	if data != nil {
		json.NewEncoder(w).Encode(data)
	}
}

func respondError(w http.ResponseWriter, status int, message string) {
	respondJSON(w, status, map[string]string{"error": message})
}

func parseID(r *http.Request, prefix string) (int64, error) {
	path := strings.TrimPrefix(r.URL.Path, prefix)
	path = strings.TrimSuffix(path, "/")
	parts := strings.Split(path, "/")
	if len(parts) == 0 {
		return 0, nil
	}
	return strconv.ParseInt(parts[0], 10, 64)
}

func decodeJSON(r *http.Request, v interface{}) error {
	return json.NewDecoder(r.Body).Decode(v)
}