using Invercargill;
using Invercargill.DataStructures;
using Json;

namespace Spry.Users {

    public class User : GLib.Object {
        // Identity
        public string id { get; set; }
        public string username { get; set; }
        public string email { get; set; }
        public string password_hash { get; set; }

        // Metadata
        public DateTime created_at { get; set; }
        public DateTime? updated_at { get; set; }

        // Permissions - stored as JSON array of strings
        public Vector<string> permissions { get; set; default = new Vector<string>(); }

        // Application-specific data - stored as JSON object
        public Dictionary<string, string> app_data { get; set; default = new Dictionary<string, string>(); }

        public User() {
            id = "";
            username = "";
            email = "";
            password_hash = "";
            created_at = new DateTime.now_utc();
        }

        public static User from_json(Json.Object obj) {
            var user = new User();

            user.id = obj.get_string_member("id");
            user.username = obj.get_string_member("username");
            user.email = obj.get_string_member("email");
            user.password_hash = obj.get_string_member("password_hash");

            // created_at
            if (obj.has_member("created_at")) {
                user.created_at = new DateTime.from_iso8601(
                    obj.get_string_member("created_at"),
                    new TimeZone.utc()
                );
            }

            // updated_at (optional)
            if (obj.has_member("updated_at") && !obj.get_null_member("updated_at")) {
                user.updated_at = new DateTime.from_iso8601(
                    obj.get_string_member("updated_at"),
                    new TimeZone.utc()
                );
            }

            // permissions (array of strings)
            if (obj.has_member("permissions")) {
                var perms_array = obj.get_array_member("permissions");
                foreach (var perm in perms_array.get_elements()) {
                    user.permissions.add(perm.get_string());
                }
            }

            // app_data (object with string values)
            if (obj.has_member("app_data") && !obj.get_null_member("app_data")) {
                var app_data_obj = obj.get_object_member("app_data");
                foreach (var key in app_data_obj.get_members()) {
                    var value = app_data_obj.get_string_member(key);
                    user.app_data.set(key, value);
                }
            }

            return user;
        }

        public Json.Object to_json() {
            var obj = new Json.Object();

            obj.set_string_member("id", id);
            obj.set_string_member("username", username);
            obj.set_string_member("email", email);
            obj.set_string_member("password_hash", password_hash);
            obj.set_string_member("created_at", created_at.format_iso8601());

            // updated_at (optional)
            if (updated_at != null) {
                obj.set_string_member("updated_at", ((!)updated_at).format_iso8601());
            } else {
                obj.set_null_member("updated_at");
            }

            // permissions array
            var perms_array = new Json.Array();
            foreach (var perm in permissions) {
                perms_array.add_string_element(perm);
            }
            obj.set_array_member("permissions", perms_array);

            // app_data object
            var app_data_obj = new Json.Object();
            var iter = app_data.iterator();
            while (iter.next()) {
                var pair = iter.get();
                app_data_obj.set_string_member(pair.key, pair.value);
            }
            obj.set_object_member("app_data", app_data_obj);

            return obj;
        }
    }
}