package errors

import (
	stdErrors "errors"
	"net/http"
)

// HTTPStatus resolves the HTTP status code for err.
//
// If err (or anything wrapped by it) is an AppError with a non-zero HTTPCode,
// that code is returned; otherwise the fallback is http.StatusInternalServerError
// (500). New and Wrap propagate the cause's status, so wrapping a sentinel such
// as ErrNotFound keeps status 404.
func HTTPStatus(err error) int {
	var appErr *AppError
	if stdErrors.As(err, &appErr) && appErr.HTTPCode != 0 {
		return appErr.HTTPCode
	}
	return http.StatusInternalServerError
}

// ToJSON renders err as an RFC 7807 style error object, aligned with the client
// API contract {error:{code,message}}.
//
// For an AppError (or one wrapped by it) the Code and Message are returned
// verbatim. For any other error a generic internal error is returned so that
// internal details are never leaked to the user; the underlying error is kept
// only in the Cause field for logging.
func ToJSON(err error) map[string]any {
	var appErr *AppError
	if stdErrors.As(err, &appErr) {
		return map[string]any{
			"error": map[string]any{
				"code":    appErr.Code,
				"message": appErr.Message,
			},
		}
	}
	return map[string]any{
		"error": map[string]any{
			"code":    ErrInternal.Code,
			"message": ErrInternal.Message,
		},
	}
}