using Invercargill;
using Invercargill.DataStructures;
using Astralis;

namespace Statum {

    /**
     * The per-request Statum context, shared by page, entrypoint and action
     * handlers.
     */
    public class StatumRequest : Object {

        /** The request URI (e.g. the page's `<pstm-uri>` or an action URI). */
        public string uri { get; set; }

        /** Route parameters captured from the matched {@link EndpointRoute}. */
        public ReadOnlyAssociative<string, string> route_params { get; set; default = new Dictionary<string, string>(); }

        /** Held slots, indexed by type name. */
        public ReadOnlyAssociative<string, HeldSlot> held { get; set; default = new Dictionary<string, HeldSlot>(); }

        /** The request's query parameters. */
        public Catalogue<string, string> query { get; set; }

        /**
         * Action-private data decrypted from the `X-Statum-Private` header, or
         * `null` for non-action requests.
         */
        public Properties? action_private { get; set; }

        /** Parsed form body for POST/PUT/PATCH actions, or `null`. */
        public FormData? form { get; set; }

        /**
         * Reads a held slot's public data as a typed model, or `null` if the slot
         * is not held or cannot be mapped.
         */
        public TPublic? held_as<TPublic>(string type_name) {
            HeldSlot slot;
            if (!held.try_get(type_name, out slot) || slot == null) {
                return null;
            }
            try {
                return GObjectMapping.from_properties_typed<TPublic>(typeof(TPublic), ((!)slot).@public);
            } catch (GLib.Error e) {
                return null;
            }
        }

        /** Raw route parameter (from a `<pstm-uri>` template like `/cats/{species}`), or `null`. */
        public string? route(string name) {
            return route_params.get_or_default(name);
        }
    }
}