package handlers

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

	"github.com/jackc/pgx/v5"
)

// RespondJSON writes a JSON response with the given status code.
func RespondJSON(w http.ResponseWriter, status int, data any) {
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(status)
	_ = json.NewEncoder(w).Encode(data)
}

// RespondSuccess returns the common success envelope.
func RespondSuccess(w http.ResponseWriter, data any) {
	RespondJSON(w, http.StatusOK, modelsAPIResponse{Code: 0, Message: "ok", Data: data})
}

// RespondError returns the common error envelope.
func RespondError(w http.ResponseWriter, status int, code int, message string) {
	RespondJSON(w, status, modelsAPIResponse{Code: code, Message: message, Data: nil})
}

// MapError maps repository/ service errors to HTTP status and code.
func MapError(err error) (status int, code int, message string) {
	if errors.Is(err, pgx.ErrNoRows) {
		return http.StatusNotFound, 10001, "resource not found"
	}
	return http.StatusInternalServerError, 10000, "internal server error"
}

type modelsAPIResponse struct {
	Code    int    `json:"code"`
	Message string `json:"message"`
	Data    any    `json:"data"`
}