using Invercargill;
using Invercargill.DataStructures;
using InvercargillJson;
using Statum;

namespace ClankerSaddle {

    /**
     * Helpers for shaping Statum slot state. Because Statum's GObjectMapping
     * cannot serialise array/list fields, lists are built as a JsonArray and set
     * on a PropertyDictionary under a key, where stm-for-{x}-in can iterate them.
     */
    public class StateJson : Object {

        /**
         * Builds a JSON array element from a lot of GObject row models, mapping
         * each row via GObjectMapping. Use the result as a slot public-data value:
         * `dict["tasks"] = StateJson.list<TaskView>(rows);`
         */
        public static JsonElement list<T>(Lot<T> items) throws GLib.Error {
            var arr = new JsonArray();
            foreach (var item in items) {
                var props = GObjectMapping.to_properties((Object) item);
                arr.add(new JsonElement.from_properties(props));
            }
            return new JsonElement.from_elements(arr);
        }

        /** Same as {@link list} but accepts a Vala array. */
        public static JsonElement list_array<T>(T[] items) throws GLib.Error {
            var arr = new JsonArray();
            foreach (var item in items) {
                var props = GObjectMapping.to_properties((Object) item);
                arr.add(new JsonElement.from_properties(props));
            }
            return new JsonElement.from_elements(arr);
        }
    }
}