using Inversion;
using Spry;
using Spry.Authentication;
using Statum;
using ClankerSaddle.Services;

namespace ClankerSaddle {

    /**
     * Stores the browser's Web Push subscription for the signed-in
     * user: `endpoint`, `p256dh` and `auth` arrive
     * from the dashboard bell's subscribe flow
     * (`pushManager.subscribe` + the VAPID key from the page state).
     * Validated per {@link PushService.validate_subscription}; the
     * endpoint is unique per browser, so a re-subscribe replaces the
     * stored keys.
     */
    public class PushSubscribeAction : StatumAction {

        private InvercargillSql.Orm.OrmSession db = Inversion.inject<InvercargillSql.Orm.OrmSession>();
        private PushService push = inject<PushService>();
        private UserService users = inject<UserService>();

        public override async DirectiveBuilder handle() throws GLib.Error {
            var guard = yield SpryAuth.require_login(directives(), request, users);
            if (guard != null) {
                return (!)guard;
            }

            string endpoint = Forms.field(request, "endpoint");
            string p256dh = Forms.field(request, "p256dh");
            string auth = Forms.field(request, "auth");
            string problem = PushService.validate_subscription(endpoint, p256dh, auth);
            if (problem != null) {
                return directives().notify("error", @"Could not enable notifications: $((!)problem)")
                    .navigate("/");
            }

            var me = SpryAuth.current(request);
            try {
                yield push.upsert_subscription(db, me.user_id, endpoint, p256dh, auth);
                return directives().notify("success",
                        "Notifications enabled — you'll be told about questions and reviews")
                    .navigate("/");
            } catch (Error e) {
                return directives().notify("error",
                        @"Could not store the subscription: $(e.message)").navigate("/");
            }
        }
    }

    /**
     * Removes the signed-in user's subscription for an endpoint (the
     * bell's off switch; the browser already unsubscribed its side).
     */
    public class PushUnsubscribeAction : StatumAction {

        private InvercargillSql.Orm.OrmSession db = Inversion.inject<InvercargillSql.Orm.OrmSession>();
        private PushService push = inject<PushService>();
        private UserService users = inject<UserService>();

        public override async DirectiveBuilder handle() throws GLib.Error {
            var guard = yield SpryAuth.require_login(directives(), request, users);
            if (guard != null) {
                return (!)guard;
            }

            string endpoint = Forms.field(request, "endpoint");
            try {
                var me = SpryAuth.current(request);
                yield push.remove_subscription(db, me.user_id, endpoint);
                return directives().notify("success", "Notifications turned off").navigate("/");
            } catch (Error e) {
                return directives().notify("error",
                        @"Could not turn notifications off: $(e.message)").navigate("/");
            }
        }
    }

    /**
     * Flips the signed-in user's per-task "Notify me" pref: opted-in
     * users receive the task's first start, failure
     * and completion on top of the global block events every
     * push-subscribed user gets.
     */
    /**
     * The bell's "Send test notification" probe (per-browser bell):
     * queues a REAL Web Push — full RFC 8291 + VAPID path — targeted at
     * the signed-in user's own subscriptions ({@link
     * PushService.send_test}), then reports the per-endpoint outcome
     * through the notify so the UI toasts the truth. This is the
     * missing end-to-end check: a green light here proves keys,
     * crypto, the push service and the browser's subscription all
     * line up, and a failure surfaces its actual reason instead of
     * silence. Also refreshes the dashboard slot so the bell's
     * endpoint fingerprints (and a pruned dead endpoint) are current.
     */
    public class PushTestAction : StatumAction {

        private TaskService task_service = inject<TaskService>();
        private SaddleService saddle_service = inject<SaddleService>();
        private TimelineService timeline_service = inject<TimelineService>();
        private NoteService note_service = inject<NoteService>();
        private InvercargillSql.Orm.OrmSession db = inject<InvercargillSql.Orm.OrmSession>();
        private PushService push = inject<PushService>();
        private UserService users = inject<UserService>();
        private ModelConfigService model_config = inject<ModelConfigService>();

        public override async DirectiveBuilder handle() throws GLib.Error {
            var guard = yield SpryAuth.require_login(directives(), request, users);
            if (guard != null) {
                return (!)guard;
            }

            var me = SpryAuth.current(request);
            try {
                var report = yield push.send_test(db, me.user_id);
                string message;
                string kind;
                if (report.failed == 0 && report.pruned == 0) {
                    kind = "success";
                    message = report.delivered > 1
                        ? @"Test notification sent to $(report.delivered) browsers"
                        : "Test notification sent";
                } else if (report.delivered > 0) {
                    kind = "error";
                    message = @"Test notification reached $(report.delivered) browser(s)"
                        + @" but $(report.failed) failed";
                    if (report.first_failure.length > 0) {
                        message += @" ($(report.first_failure))";
                    }
                } else {
                    kind = "error";
                    message = "Test notification failed";
                    if (report.first_failure.length > 0) {
                        message += @": $(report.first_failure)";
                    }
                    if (report.pruned > 0) {
                        message += @" — $(report.pruned) dead endpoint(s) removed";
                    }
                }
                var state = yield DashboardState.build(state_service, task_service,
                    saddle_service, timeline_service, db, note_service, action_registry,
                    push, me.user_id, model_config);
                return directives().notify(kind, message).set(state);
            } catch (Error e) {
                return directives().notify("error",
                    @"Could not send the test notification: $(e.message)");
            }
        }
    }

    public class ToggleTaskNotifyAction : SealedTaskAction {

        private InvercargillSql.Orm.OrmSession db = Inversion.inject<InvercargillSql.Orm.OrmSession>();
        private PushService push = inject<PushService>();
        private UserService users = inject<UserService>();

        public override async DirectiveBuilder handle() throws GLib.Error {
            var guard = yield SpryAuth.require_login(directives(), request, users);
            if (guard != null) {
                return (!)guard;
            }

            int64 task_id = sealed_task_id();
            if (task_id <= 0) {
                return directives().navigate("/tasks");
            }

            var me = SpryAuth.current(request);
            try {
                bool enabled = !(yield push.has_notify_pref(db, me.user_id, task_id));
                yield push.set_notify_pref(db, me.user_id, task_id, enabled);
                return directives().notify("success", enabled
                        ? "You'll be notified when this task starts, fails or completes"
                        : "Task notifications turned off")
                    .navigate(@"/tasks/$(task_id)");
            } catch (Error e) {
                return directives().notify("error",
                        @"Could not toggle notifications: $(e.message)")
                    .navigate(@"/tasks/$(task_id)");
            }
        }
    }
}