using Invercargill;
using Invercargill.DataStructures;
using Invercargill.Expressions;
using Spry;
using Spry.Authentication;
using Statum;
using ClankerSaddle.Data;
using ClankerSaddle.Services;

namespace ClankerSaddle {

    /** A saddle card on the dashboard. */
    public class DashboardSaddleView : Object {
        public int64 id { get; set; }
        public string name { get; set; default = ""; }
        public string status { get; set; default = SADDLE_OFFLINE; }
        public string host { get; set; default = ""; }
        public int64 current_task_id { get; set; }
        public string current_task_title { get; set; default = ""; }
        /**
         * Set when the saddle's current task is a goal agent's run:
         * the card then links the GOAL (runs are internal — never a
         * task destination at a glance).
         */
        public int64 current_goal_id { get; set; }
        public string current_goal_title { get; set; default = ""; }
    }

    /** One entry in the dashboard's cross-task activity timeline. */
    public class DashboardActivityView : Object {
        public string kind { get; set; default = ""; }
        public int64 at_epoch { get; set; }
        public string when_display { get; set; default = ""; }
        public int64 task_id { get; set; }
        public string task_title { get; set; default = ""; }
        /** Plan 12: set on goal events — the row links the goal page. */
        public int64 goal_id { get; set; }
        public string goal_title { get; set; default = ""; }
        public string text { get; set; default = ""; }
        /**
         * The referenced task earned its 🤠 badge — any of its sessions
         * carries a `saddle yeehaw` entry (derived, nothing stored).
         */
        public bool task_yeehaw { get; set; }
    }

    /** An active task with its latest progress line. */
    public class DashboardActiveView : Object {
        public int64 id { get; set; }
        public string title { get; set; default = ""; }
        public string status { get; set; default = ""; }
        public string latest_progress { get; set; default = ""; }
        public string progress_display { get; set; default = ""; }
        public string task_branch { get; set; default = ""; }
    }

    /**
     * A pinned OPEN blocking item (plan 10 phase 3; plan 12 unified;
     * plan 15 C1 single-row): an unanswered question, RFC, review or
     * the goal agent's block (question/RFC, plan submission,
     * completion report — all rows of the goal-run task) rendered as
     * a link-through card. Goal items carry `item_type` "goal" and
     * link the goal page; task items carry "task" and link the task
     * page where the answer form lives. No inline answer forms on the
     * dashboard (settled).
     */
    public class DashboardBlockView : Object {
        /** "task" or "goal" — the pile interleaves both. */
        public string item_type { get; set; default = "task"; }
        public int64 id { get; set; }
        public int64 task_id { get; set; }
        public string task_title { get; set; default = ""; }
        /** Goal items only: the goal the block belongs to. */
        public int64 goal_id { get; set; }
        public string goal_title { get; set; default = ""; }
        public string block_type { get; set; default = "question"; }
        public string question { get; set; default = ""; }
        public string created_display { get; set; default = ""; }
        /** The created stamp's epoch — the unified newest-first key. */
        public int64 at_epoch { get; set; }
    }

    /** Public data of the dashboard's `dashboard` slot. */
    public class DashboardPublic : Object {
        public int64 draft_count { get; set; }
        public int64 queued_count { get; set; }
        public int64 ready_count { get; set; }
        public int64 active_count { get; set; }
        public int64 blocked_count { get; set; }
        public int64 done_count { get; set; }
        public int64 failed_count { get; set; }
        public int64 idle_saddle_count { get; set; }
        public Statum.Model.ActionDto? refresh { get; set; }
        /** The VAPID public key the browser subscribes with ("" when push is unavailable). */
        public string push_vapid_key { get; set; default = ""; }
        /** The signed-in user holds at least one push subscription. */
        public bool push_subscribed { get; set; }
        public Statum.Model.ActionDto? push_subscribe { get; set; }
        public Statum.Model.ActionDto? push_unsubscribe { get; set; }
    }

    /**
     * Builds the `dashboard` slot state shared by the home entrypoint and
     * the {@link RefreshDashboardAction} pulse refresh, so both hydrate
     * identical state: queue counters, saddle cards, the pinned OPEN
     * blocking items as link-through cards (newest first — plan 10
     * phase 3; goal items arrive with the run task's own blocks,
     * plan 15 C1), active tasks with their latest progress, and the
     * cross-task activity timeline ({@link TimelineService}: last ~50
     * events, newest first).
     */
    public class DashboardState : Object {

        /**
         * Loads the dashboard aggregate and shapes its PAGE slot. The
         * `db` session comes from the caller (entrypoint or action scope).
         */
        public static async Statum.Slot build(StateService state_service, TaskService tasks,
                SaddleService saddles, TimelineService timeline,
                InvercargillSql.Orm.OrmSession db,
                ActionRegistry? actions = null, PushService? push = null,
                int64 viewer_id = 0) throws GLib.Error {
            var pub = new DashboardPublic();
            var titles = new Dictionary<string, string>();
            var all_tasks = yield tasks.list_tasks(null, null);
            foreach (var task in all_tasks) {
                titles.set(task.id.to_string(), task.title);
                // Goal-agent runs are internal tasks — they never count
                // against the human-facing queue summary (the goal page
                // owns their visibility).
                if (task.kind == TASK_KIND_GOAL_RUN) {
                    continue;
                }
                switch (task.status) {
                    case STATUS_DRAFT:
                        pub.draft_count++;
                        break;
                    case STATUS_QUEUED:
                        pub.queued_count++;
                        break;
                    case STATUS_ASSIGNED:
                    case STATUS_WORKING:
                        pub.active_count++;
                        break;
                    case STATUS_BLOCKED:
                    case STATUS_REVIEW_REQUESTED:
                        pub.blocked_count++;
                        break;
                    case STATUS_DONE:
                        pub.done_count++;
                        break;
                    case STATUS_FAILED:
                        pub.failed_count++;
                        break;
                    default:
                        break;
                }
            }
            int64 ready_count = 0;
            foreach (var task in yield tasks.get_ready_tasks()) {
                if (task.kind != TASK_KIND_GOAL_RUN) {
                    ready_count++;
                }
            }
            pub.ready_count = ready_count;


            var saddle_rows = new Vector<DashboardSaddleView>();
            foreach (var saddle in yield saddles.list_saddles()) {
                if (saddle.status == SADDLE_IDLE) {
                    pub.idle_saddle_count++;
                }
                var view = new DashboardSaddleView() {
                    id = saddle.id,
                    name = saddle.name,
                    status = saddle.status,
                    host = saddle.host,
                    current_task_id = saddle.current_task_id
                };
                var work = yield saddles.current_work_view(saddle);
                if (work != null) {
                    view.current_task_title = ((!)work).task_title;
                    if (((!)work).goal_id > 0) {
                        view.current_goal_id = ((!)work).goal_id;
                        view.current_goal_title = ((!)work).goal_title;
                    }
                }
                saddle_rows.add(view);
            }

            var active = new Vector<DashboardActiveView>();
            var pinned = new Vector<DashboardBlockView>();
            foreach (var task in yield tasks.list_tasks(null, null)) {
                // Goal-agent runs are internal — never an "active
                // task" row (the goal page shows the agent's
                // activity). Their BLOCKS still pin below (plan 15
                // C1): the run task's rows are the goal's pile cards.
                bool internal_run = task.kind == TASK_KIND_GOAL_RUN;
                if (!internal_run
                        && (task.status == STATUS_ASSIGNED || task.status == STATUS_WORKING
                        || task.status == STATUS_BLOCKED || task.status == STATUS_REVIEW_REQUESTED)) {
                    var row = new DashboardActiveView() {
                        id = task.id,
                        title = task.title,
                        status = task.status,
                        task_branch = task.task_branch ?? ""
                    };
                    var progress = yield tasks.list_progress(task.id);
                    if (progress.length > 0) {
                        row.latest_progress = progress.first().summary;
                        row.progress_display = format_stamp(progress.first().created_at);
                    }
                    active.add(row);
                }

                // Every unanswered block pins as a link-through card —
                // questions, RFCs and reviews alike. Plan 15 C1: the
                // goal agent's blocks ARE the run task's blocks (one
                // row each) — they render as goal items (goal badge,
                // goal link) straight from this same loop; there is no
                // goal-side pass and no mirror to consult.
                int64 block_goal_id = 0;
                string block_goal_title = "";
                if (internal_run && task.goal_id > 0) {
                    block_goal_id = task.goal_id;
                    var goal_row = yield db.query<Goal>()
                        .where(expr("id == $0", elem<int64?>(task.goal_id)))
                        .first_async();
                    block_goal_title = goal_row != null ? ((!)goal_row).title : "";
                }
                foreach (var block in yield tasks.list_blocks(task.id)) {
                    if (block.answer != null) {
                        continue;
                    }
                    var view = new DashboardBlockView() {
                        item_type = block_goal_id > 0 ? "goal" : "task",
                        id = block.id,
                        task_id = task.id,
                        task_title = task.title,
                        goal_id = block_goal_id,
                        goal_title = block_goal_title,
                        block_type = block.block_type,
                        question = block.question,
                        created_display = format_stamp(block.created_at)
                    };
                    if (block.created_at != null) {
                        view.at_epoch = ((!)block.created_at).to_unix();
                    }
                    pinned.add(view);
                }
            }
            // Newest first (plan 10 phase 3): the most recent question,
            // RFC, review or goal block leads the unified pile.
            var pinned_sorted = pinned.sort((a, b) => {
                if (a.at_epoch != b.at_epoch) {
                    return a.at_epoch > b.at_epoch ? -1 : 1;
                }
                return a.id > b.id ? -1 : 1;
            });

            if (actions != null) {
                pub.refresh = ((!)actions).author<RefreshDashboardAction>("GET");
                pub.push_subscribe = ((!)actions).author<PushSubscribeAction>();
                pub.push_unsubscribe = ((!)actions).author<PushUnsubscribeAction>();
            }
            // Web Push bell state (plan 11 task E): the VAPID key the
            // browser needs + whether this user already subscribed.
            pub.push_vapid_key = PushService.vapid_public_key;
            if (push != null && viewer_id > 0) {
                pub.push_subscribed = yield ((!)push).user_subscribed(db, viewer_id);
            }

            var activity = new Vector<DashboardActivityView>();
            // The 🤠 badge rides every timeline task reference: one
            // batch presence set for the whole activity window.
            var yeehaw_ids = yield tasks.yeehaw_task_ids();
            foreach (var item in yield timeline.recent_window()) {
                activity.add(new DashboardActivityView() {
                    kind = item.kind,
                    at_epoch = item.at_epoch,
                    when_display = format_stamp(new DateTime.from_unix_local(item.at_epoch)),
                    task_id = item.task_id,
                    task_title = item.task_title,
                    goal_id = item.goal_id,
                    goal_title = item.goal_title,
                    text = item.text,
                    task_yeehaw = yeehaw_ids.has(item.task_id.to_string())
                });
            }

            var props = (PropertyDictionary) GObjectMapping.to_properties(pub);
            props["saddles"] = StateJson.list<DashboardSaddleView>(saddle_rows.to_immutable_buffer());
            props["activity"] = StateJson.list<DashboardActivityView>(activity.to_immutable_buffer());
            props["active_tasks"] = StateJson.list<DashboardActiveView>(active.to_immutable_buffer());
            props["pinned"] = StateJson.list<DashboardBlockView>(pinned_sorted.to_immutable_buffer());

            return state_service.new_slot(Scope.PAGE, new Statum.State() {
                type_name = "dashboard",
                public_data = props,
                private_data = new PropertyDictionary()
            });
        }

    }

    /**
     * Entrypoint for /: the dashboard — queue summary, the pinned OPEN
     * blocking items as link-through cards (newest first), active tasks
     * with their latest progress, saddle cards, and the cross-task
     * activity timeline (last ~50 events, newest first). The page
     * subscribes to the global pulse and re-runs its sealed refresh
     * action whenever task or saddle state changes anywhere in the app.
     */
    public class HomeEntrypoint : StatumEntrypoint {

        private TaskService task_service = Inversion.inject<TaskService>();
        private SaddleService saddle_service = Inversion.inject<SaddleService>();
        private TimelineService timeline_service = Inversion.inject<TimelineService>();
        private InvercargillSql.Orm.OrmSession db = Inversion.inject<InvercargillSql.Orm.OrmSession>();
        private PushService push_service = Inversion.inject<PushService>();
        private UserService users = Inversion.inject<UserService>();

        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);
            var state = yield DashboardState.build(state_service, task_service,
                saddle_service, timeline_service, db, action_registry,
                push_service, me != null ? ((!)me).user_id : 0);
            return directives().set(state).subscribe_global(StatePulse.SLOT_TYPE);
        }
    }
}