using Invercargill.DataStructures;
using Json;

namespace Spry.Users {

    public class Session : GLib.Object {
        // Identity
        public string id { get; set; }
        public string user_id { get; set; }

        // Timing
        public DateTime created_at { get; set; }
        public DateTime expires_at { get; set; }

        // Optional tracking
        public string? ip_address { get; set; }
        public string? user_agent { get; set; }

        public Session() {
            id = "";
            user_id = "";
            created_at = new DateTime.now_utc();
            expires_at = new DateTime.now_utc();
        }

        public bool is_expired() {
            return expires_at.compare(new DateTime.now_utc()) <= 0;
        }

        public static Session from_json(Json.Object obj) {
            var session = new Session();

            // Required string fields - use has_member and null coalescing for safety
            session.id = obj.has_member("id") ? (obj.get_string_member("id") ?? "") : "";
            session.user_id = obj.has_member("user_id") ? (obj.get_string_member("user_id") ?? "") : "";

            // created_at - check member exists and value is not null/empty
            if (obj.has_member("created_at")) {
                var created_str = obj.get_string_member("created_at");
                if (created_str != null && created_str.length > 0) {
                    session.created_at = new DateTime.from_iso8601(created_str, new TimeZone.utc());
                }
            }

            // expires_at - check member exists and value is not null/empty
            if (obj.has_member("expires_at")) {
                var expires_str = obj.get_string_member("expires_at");
                if (expires_str != null && expires_str.length > 0) {
                    session.expires_at = new DateTime.from_iso8601(expires_str, new TimeZone.utc());
                }
            }

            // ip_address (optional) - check member exists and is not null
            if (obj.has_member("ip_address")) {
                var member = obj.get_member("ip_address");
                if (member != null && member.get_node_type() == Json.NodeType.VALUE) {
                    session.ip_address = obj.get_string_member("ip_address");
                }
            }

            // user_agent (optional) - check member exists and is not null
            if (obj.has_member("user_agent")) {
                var member = obj.get_member("user_agent");
                if (member != null && member.get_node_type() == Json.NodeType.VALUE) {
                    session.user_agent = obj.get_string_member("user_agent");
                }
            }

            return session;
        }

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

            // Use null coalescing to ensure we never pass null to set_string_member
            obj.set_string_member("id", id ?? "");
            obj.set_string_member("user_id", user_id ?? "");
            obj.set_string_member("created_at", created_at != null ? created_at.format_iso8601() : new DateTime.now_utc().format_iso8601());
            obj.set_string_member("expires_at", expires_at != null ? expires_at.format_iso8601() : new DateTime.now_utc().format_iso8601());

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

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

            return obj;
        }
    }
}