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

namespace ClankerSaddle {

    /** Sealed task id carried by the task row actions. */
    public class TaskActionPrivate : Object {
        public int64 task_id { get; set; }
    }

    /** Sealed block identity carried by {@link AnswerBlockAction}. */
    public class BlockAnswerPrivate : Object {
        public int64 task_id { get; set; }
        public int64 block_id { get; set; }
    }

    /**
     * Common base for actions sealed against a task id: materialises the
     * typed private blob and exposes the resolved id (falling back to the
     * hidden `task_id` form field).
     */
    public abstract class SealedTaskAction : TypedStatumAction<TaskActionPrivate> {

        protected override Type private_type { get { return typeof(TaskActionPrivate); } }

        /** The sealed task id, or 0 when neither blob nor form field carried one. */
        protected int64 sealed_task_id() {
            var ctx = request_private;
            return ctx != null ? ((!)ctx).task_id : Forms.integer(request, "task_id", 0);
        }
    }

    /**
     * Shared base for task-page actions that answer with the
     * refreshed task slot instead of a navigate (goal 2 QoL): owns
     * the service set {@link TaskDetailState.build} needs, so a
     * mutation rebuilds the page view with ONE call -
     * {@link task_detail_slot} - instead of every action copy-pasting
     * the injections and the build chain. Success paths answer
     * notify(...).set(slot); flows whose result genuinely IS
     * navigation (create -> detail, delete -> list) keep navigating.
     */
    public abstract class TaskDetailRefreshingAction : SealedTaskAction {

        protected TaskService task_service = inject<TaskService>();
        protected ProjectService project_service = inject<ProjectService>();
        protected SaddleService saddle_service = inject<SaddleService>();
        protected RuleService rule_service = inject<RuleService>();
        protected CapabilityService capability_service = inject<CapabilityService>();
        protected SaddlePollState poll_state = inject<SaddlePollState>();
        protected PushService push_service = inject<PushService>();
        protected EventService event_service = inject<EventService>();
        protected InvercargillSql.Orm.OrmSession db = Inversion.inject<InvercargillSql.Orm.OrmSession>();
        protected UserService users = inject<UserService>();

        /**
         * Rebuilds the task detail slot from current data - the ONE
         * call a mutation needs to answer with refreshed state (the
         * same build the page's refresh action runs).
         */
        protected async Statum.Slot task_detail_slot(int64 task_id) throws GLib.Error {
            var me = SpryAuth.current(request);
            return yield TaskDetailState.build(state_service, task_service,
                project_service, saddle_service, rule_service, capability_service,
                action_registry, poll_state, push_service, event_service, db,
                me != null ? ((!)me).user_id : 0, task_id);
        }
    }


    /**
     * Creates a task from the queue form (project and title required).
     * The task lands in DRAFT — the human Enqueue action queues it;
     * there is no agent path. Priority clamps to 1–9. Branch fields
     * are optional — `branch_from` prefills from the project's default
     * branch. The mode select and capabilities apply until a worker is
     * assigned; `enqueue_after_task_id` is the human-only auto-enqueue
     * predecessor (goal tasks sequence via the goal agent instead).
     */
    public class CreateTaskAction : StatumAction {

        private TaskService tasks = inject<TaskService>();
        private CapabilityService capabilities = inject<CapabilityService>();
        private UserService users = inject<UserService>();
        private ProjectService projects = inject<ProjectService>();

        /** The project of `id`, or null (standalone validation). */
        private async ClankerSaddle.Data.Project? tasks_project(int64 id) throws GLib.Error {
            return yield projects.get_project(id);
        }

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

            int64 project_id = Forms.integer(request, "project_id", 0);
            string title = Forms.field(request, "title");
            // Goal 8 task 4: project_id 0 posts a STANDALONE task (the
            // form's "No project" option) — no repository, its own
            // ephemeral workspace; negative ids are form corruption.
            if (project_id < 0) {
                return directives().notify("error", "Unknown project").navigate("/tasks");
            }
            if (title.length == 0) {
                return directives().notify("error", "Title is required").navigate("/tasks");
            }
            if (project_id > 0) {
                var project = yield tasks_project(project_id);
                if (project == null) {
                    return directives().notify("error",
                            @"No project exists with id $(project_id)").navigate("/tasks");
                }
            }

            // Required capabilities: the create form's multi-select posts
            // several capability_id fields; every id must resolve before
            // the task is created. (A plain array — the Invercargill
            // collections mishandle boxed value types in foreach.)
            int64[] required = {};
            if (request.form != null) {
                foreach (var value in request.form.get_field_all("capability_id")) {
                    int64 parsed = int64.parse(value.strip());
                    if (parsed <= 0) {
                        continue;
                    }
                    var capability = yield capabilities.get_capability(parsed);
                    if (capability == null) {
                        return directives().notify("error",
                                @"No capability exists with id $(parsed)").navigate("/tasks");
                    }
                    required += parsed;
                }
            }

            try {
                string mode = Forms.field(request, "mode");
                if (mode.length == 0) {
                    mode = "implement";
                }
                if (!is_valid_mode(mode)) {
                    return directives().notify("error",
                        @"Unknown mode '$(mode)'").navigate("/tasks");
                }
                int64 enqueue_after = Forms.integer(request, "enqueue_after_task_id", 0);
                if (enqueue_after > 0) {
                    yield tasks.validate_enqueue_after_cycle(-1, enqueue_after);
                }
                var task = yield tasks.create_task(project_id, title,
                    Forms.field_raw(request, "description"),
                    Forms.integer(request, "priority", 5),
                    Forms.optional(request, "task_branch"),
                    Forms.optional(request, "branch_from"),
                    STATUS_DRAFT, TASK_KIND_TASK, mode, CREATOR_HUMAN, 0,
                    enqueue_after);
                foreach (int64 capability_id in required) {
                    yield capabilities.attach_to_task(capability_id, task.id);
                }
                return directives().notify("success", @"Task '$(task.title)' created in draft")
                    .navigate(@"/tasks/$(task.id)");
            } catch (Error e) {
                return directives().notify("error", @"Could not create the task: $(e.message)").navigate("/tasks");
            }
        }
    }

    /**
     * Saves the human-editable fields of a task under the draft
     * lifecycle's edit matrix (see {@link TaskService.edit_task}): in
     * draft every field except status, in non-draft non-terminal
     * states priority only, in terminal states nothing. Status is not
     * part of the form — Enqueue/Cancel/agent transitions own it.
     */
    public class UpdateTaskAction : TaskDetailRefreshingAction {

        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");
            }

            try {
                int64? priority = null;
                string priority_field = Forms.field(request, "priority");
                if (priority_field.length > 0) {
                    priority = Forms.integer(request, "priority", 5);
                }
                // The plan-12 mode select and the auto-enqueue
                // predecessor (draft-only fields; -1 clears).
                string mode = "";
                if (request.form != null && request.form.get_field("mode") != null) {
                    mode = Forms.field(request, "mode");
                }
                int64? enqueue_after = null;
                string enqueue_field = Forms.field(request, "enqueue_after_task_id");
                if (enqueue_field.length > 0) {
                    int64 parsed = int64.parse(enqueue_field);
                    enqueue_after = parsed > 0 ? parsed : -1;
                }
                // The carried fix: the mandate only updates when the
                // form actually carried the description field (the
                // priority-only edit must not blank it — an absent
                // field is "leave unchanged", same as title).
                yield task_service.edit_task(task_id,
                    Forms.optional(request, "title"),
                    request.form != null && request.form.get_field("description") != null
                        ? Forms.field(request, "description") : null,
                    priority,
                    request.form != null && request.form.get_field("task_branch") != null
                        ? Forms.field(request, "task_branch") : null,
                    request.form != null && request.form.get_field("branch_from") != null
                        ? Forms.field(request, "branch_from") : null,
                    mode.length > 0 ? mode : null,
                    enqueue_after);
                return directives().notify("success", "Task saved").set(yield task_detail_slot(task_id));
            } catch (Error e) {
                return directives().notify("error", @"Could not save the task: $(e.message)")
                    .navigate(@"/tasks/$(task_id)");
            }
        }
    }

    /**
     * Appends a comment to a task as the signed-in user. An optional
     * `quote` field carries text the user highlighted in the terminal log
     * or an RFC body; the quote is stored with the comment and delivered
     * to the saddle as a quote block.
     */
    public class AddCommentAction : SealedTaskAction {

        private TaskService tasks = inject<TaskService>();
        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();
            string body = Forms.field_raw(request, "body");
            string quote = Forms.field_raw(request, "quote");
            if (task_id <= 0 || body.length == 0) {
                return directives().notify("error", "A comment body is required").navigate(@"/tasks/$(task_id)");
            }

            var me = SpryAuth.current(request);
            try {
                var task = yield tasks.get_task(task_id);
                if (task == null) {
                    return directives().notify("error", @"No task exists with id $(task_id)")
                        .navigate("/tasks");
                }
                // Goal 8 task 4: comments stay OPEN on terminal tasks,
                // and a comment on a TERMINAL NON-GOAL task (goal_id
                // == 0) resurrects it — the task re-queues with the
                // comment injected (the daemon receives the thread's
                // comments on start). Goal-owned worker tasks keep
                // their goal agent as the only voice: the service
                // refuses below.
                bool terminal_plain = (((!)task).task.goal_id == 0)
                    && ((((!)task).task.status == STATUS_DONE)
                        || (((!)task).task.status == STATUS_FAILED));
                yield tasks.add_comment(task_id, @"user:$(me.username)", body, quote);
                if (terminal_plain) {
                    yield tasks.requeue_terminal_task(task_id);
                }
                // Terminals post with a return_to so the live view survives
                // the comment; every other caller lands on the task page.
                string return_to = Forms.field(request, "return_to");
                string destination = return_to.length > 0 && return_to.has_prefix("/")
                    ? return_to : @"/tasks/$(task_id)";
                string message = terminal_plain
                    ? "Comment added — task re-queued for another round" : "Comment added";
                return directives().notify("success", message).navigate(destination);
            } catch (Error e) {
                return directives().notify("error", @"Could not add the comment: $(e.message)")
                    .navigate(@"/tasks/$(task_id)");
            }
        }
    }

    /**
     * Records the human's answer to a block; the task and block ids come
     * from the sealed {@link BlockAnswerPrivate} blob. Question blocks
     * submit either a chosen `option` or the free-text `other` field.
     * Review and plan blocks submit a `feedback` reply which is stored
     * wrapped in the stable verdict wording ("Review feedback
     * received:\n…" / "Plan feedback received:\n…") — the answer is the
     * resume_notice the daemon reads. Plan 16 S2/R4: accept forms post
     * a `verdict` marker (`accept`) instead of the stable constants —
     * the server resolves the block kind and owns every verdict string.
     * Accepting a plan (the stable approval wording) also applies the
     * submitted plan markdown to task.plan. Question/RFC answers are
     * stored verbatim — the resume-notice builder applies the "Human
     * selected: …" formatting.
     */
    public class AnswerBlockAction : TypedStatumAction<BlockAnswerPrivate> {

        private TaskService tasks = inject<TaskService>();
        private GoalService goals = inject<GoalService>();
        private UserService users = inject<UserService>();

        protected override Type private_type { get { return typeof(BlockAnswerPrivate); } }

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

            var ctx = request_private;
            if (ctx == null) {
                return directives().navigate("/tasks");
            }
            int64 task_id = ((!)ctx).task_id;

            string option = Forms.field(request, "option");
            string other = Forms.field_raw(request, "other");
            string answer = Forms.field_raw(request, "answer");
            string feedback = Forms.field_raw(request, "feedback");
            string verdict = Forms.field(request, "verdict");
            if (option == "__other__") {
                answer = other.strip().length > 0 ? other.strip() : answer;
            } else if (option.length > 0) {
                answer = option;
            } else if (verdict == "accept" || feedback.strip().length > 0) {
                // S2/R4: the server owns the verdict wording — the
                // block's kind picks the stable string.
                string type = "";
                var detail = yield tasks.get_task(task_id);
                if (detail != null) {
                    foreach (var candidate in ((!)detail).blocks) {
                        if (candidate.id == ((!)ctx).block_id) {
                            type = candidate.block_type;
                            break;
                        }
                    }
                }
                if (verdict == "accept") {
                    answer = type == BLOCK_PLAN
                        ? NOTICE_PLAN_APPROVED : NOTICE_REVIEW_APPROVED;
                } else {
                    answer = type == BLOCK_PLAN
                        ? @"$(NOTICE_PLAN_FEEDBACK)\n$(feedback.strip())"
                        : @"$(NOTICE_REVIEW_FEEDBACK)\n$(feedback.strip())";
                }
            }
            if (answer.length == 0) {
                return directives().notify("error", "An answer is required").navigate(@"/tasks/$(task_id)");
            }

            try {
                // Plan 15 C1: a goal-run task's blocks ARE the goal's
                // blocks — the deep-link answer funnels into the ONE
                // goal answer path (verdict transitions + row settle +
                // resume machinery); every other task answers plainly.
                // The answer rides the parked workspace's resume
                // verbatim (the stable verdicts).
                var detail = yield tasks.get_task(task_id);
                if (detail != null && ((!)detail).task.kind == TASK_KIND_GOAL_RUN
                        && ((!)detail).task.goal_id > 0) {
                    var me = SpryAuth.current(request);
                    yield goals.answer_block(((!)ctx).block_id, answer,
                        me != null ? @"user:$(me.username)" : null);
                } else {
                    yield tasks.answer_block(((!)ctx).block_id, answer);
                }
                return directives().notify("success", "Answer recorded; the saddle will collect it")
                    .navigate(@"/tasks/$(task_id)");
            } catch (Error e) {
                return directives().notify("error", @"Could not answer the block: $(e.message)")
                    .navigate(@"/tasks/$(task_id)");
            }
        }
    }

    /**
     * The human-only Enqueue action: moves a draft task into the
     * queue. Refused with a shown error while any dependency is still
     * in draft; there is no agent path to enqueueing whatsoever.
     */
    public class EnqueueTaskAction : SealedTaskAction {

        private TaskService tasks = inject<TaskService>();
        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");
            }

            try {
                yield tasks.enqueue_task(task_id, CREATOR_HUMAN);
                return directives().notify("success", "Task enqueued").navigate(@"/tasks/$(task_id)");
            } catch (Error e) {
                return directives().notify("error", @"Could not enqueue the task: $(e.message)")
                    .navigate(@"/tasks/$(task_id)");
            }
        }
    }

    /**
     * The human-only Delete action: removes a draft task that nothing
     * depends on (an error names the dependents otherwise — they must
     * be deleted first). Non-draft tasks are refused.
     */
    public class DeleteTaskAction : SealedTaskAction {

        private TaskService tasks = inject<TaskService>();
        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");
            }

            // Plan 12: goal tasks are the goal agent's to delete (the
            // task CLI callback under its goal) — humans cancel goals
            // instead; the cascade closes their tasks.
            var detail = yield tasks.get_task(task_id);
            if (detail != null && (((!)detail).task.creator != CREATOR_HUMAN
                    || ((!)detail).task.kind == TASK_KIND_GOAL_RUN)) {
                return directives().notify("error",
                        "Goal tasks are managed by their goal agent — cancel the goal instead")
                    .navigate(@"/tasks/$(task_id)");
            }

            try {
                yield tasks.delete_task(task_id);
                return directives().notify("success", "Draft task deleted").navigate("/tasks");
            } catch (Error e) {
                return directives().notify("error", @"Could not delete the task: $(e.message)")
                    .navigate(@"/tasks/$(task_id)");
            }
        }
    }

    /**
     * Cancels a task (status 'failed'); the sealed id comes from the task
     * page's cancel button. Only non-draft non-terminal tasks offer the
     * action — drafts are deleted, terminal tasks are already finished,
     * and completion itself is agent-only. The abort-before-cancel
     * orchestration lives in {@link LifecycleService.cancel_task}.
     */
    public class CancelTaskAction : SealedTaskAction {

        private TaskService tasks = inject<TaskService>();
        private LifecycleService lifecycle = inject<LifecycleService>();
        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 detail = yield tasks.get_task(task_id);
            if (detail == null) {
                return directives().navigate("/tasks");
            }
            string status = ((!)detail).task.status;
            if (status == STATUS_DRAFT || status == STATUS_DONE || status == STATUS_FAILED) {
                return directives().notify("error",
                        "Only non-draft, non-terminal tasks can be cancelled")
                    .navigate(@"/tasks/$(task_id)");
            }

            try {
                yield lifecycle.cancel_task(task_id);
                return directives().notify("success", "Task cancelled").navigate(@"/tasks/$(task_id)");
            } catch (Error e) {
                return directives().notify("error", @"Could not cancel the task: $(e.message)")
                    .navigate(@"/tasks/$(task_id)");
            }
        }
    }

    /**
     * Retries a failed task: the requeue path with the failure summary
     * cleared (plan 16 S4: the terminal cache dies with its attempt —
     * nothing derived is copied to the thread), all other history
     * kept. The next dispatch resumes the daemon-side workspace when
     * it still exists; the abort-first orchestration lives in
     * {@link LifecycleService.retry_task}.
     */
    public class RetryTaskAction : SealedTaskAction {

        private TaskService tasks = inject<TaskService>();
        private LifecycleService lifecycle = inject<LifecycleService>();
        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 detail = yield tasks.get_task(task_id);
            if (detail == null) {
                return directives().navigate("/tasks");
            }
            if (((!)detail).task.status != STATUS_FAILED) {
                return directives().notify("error", "Only failed tasks can be retried")
                    .navigate(@"/tasks/$(task_id)");
            }

            try {
                yield lifecycle.retry_task(task_id);
                return directives().notify("success", "Task requeued for another attempt")
                    .navigate(@"/tasks/$(task_id)");
            } catch (Error e) {
                return directives().notify("error", @"Could not retry the task: $(e.message)")
                    .navigate(@"/tasks/$(task_id)");
            }
        }
    }

    /**
     * Goal 4 task 1 (Force Wake): the human recovery lever for a
     * parked PLAIN task — sets the task force-wake flag so the
     * allocation offers it again on its affine saddle with the
     * explicit wake notice. A suspended GOAL RUN task routes to the
     * SAME goal force-wake (GoalForceWakeAction) — one path, no
     * duplicate semantics; the page authors that variant's button.
     */
    public class TaskForceWakeAction : TaskDetailRefreshingAction {

        private GoalService goal_service = inject<GoalService>();

        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");
            }

            try {
                var detail = yield task_service.get_task(task_id);
                if (detail == null) {
                    return directives().notify("error", @"No task exists with id $(task_id)").navigate("/tasks");
                }
                var task = ((!)detail).task;
                if (task.kind == TASK_KIND_GOAL_RUN) {
                    // One path: the run's wake is the GOAL's wake.
                    yield goal_service.force_wake_goal(task.goal_id);
                    return directives().notify("success",
                            "Goal run force-woke — the parked agent resumes on its saddle")
                        .navigate(@"/goals/$(task.goal_id)");
                }
                if (task.status != STATUS_SUSPENDED) {
                    return directives().notify("error",
                            "Only parked tasks can be force-woke — nothing was woken")
                        .navigate(@"/tasks/$(task_id)");
                }
                task.force_wake = true;
                yield db.update_async<TaskEntity>(task);
                var wake_payload = new Json.Object();
                wake_payload.set_string_member("text",
                    "The user explicitly force-woke this parked task — resume where you left off.");
                yield event_service.append(EVENT_FORCE_WAKE, EVENT_ACTOR_USER,
                    EVENT_SCOPE_TASK, task_id, wake_payload);
                return directives().notify("success",
                        "Task force-woke — the parked run resumes on its saddle")
                    .set(yield task_detail_slot(task_id));
            } catch (Error e) {
                return directives().notify("error", @"Could not force-woke the task: $(e.message)")
                    .navigate(@"/tasks/$(task_id)");
            }
        }
    }

    /**
     * Manually requeues a task stuck working/blocked on a saddle that
     * went offline (the automatic staleness probe may never fire when
     * the saddle row was refreshed to offline first). The same path as
     * the dispatcher's abandon: requeue + system comment + saddle
     * offline — owned by {@link LifecycleService.requeue_for_resume}.
     */
    public class ResumeTaskAction : SealedTaskAction {

        private LifecycleService lifecycle = inject<LifecycleService>();
        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");
            }

            try {
                yield lifecycle.requeue_for_resume(task_id);
                return directives().notify("success",
                        "Task requeued; the daemon restores its context on the next dispatch")
                    .navigate(@"/tasks/$(task_id)");
            } catch (Error e) {
                return directives().notify("error", @"Could not requeue the task: $(e.message)")
                    .navigate(@"/tasks/$(task_id)");
            }
        }
    }

    /**
     * The task detail page's polling action: rebuilds the `task` slot from
     * current data so the three-second client poll shows live comments,
     * blocks, output-driven status changes and completions. Navigates
     * nowhere; a failed reload leaves the client's state untouched.
     *
     * Goal 41 T7: the page also embeds the event log's shell (its
     * "Log" tab), so the refresh rebuilds the `task_log` slot too —
     * the embedded live badge's status words stay truthful after a
     * transition without the log shell owning its own poll.
     */
    public class RefreshTaskDataAction : TaskDetailRefreshingAction {

        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();
            }

            return directives().set(yield task_detail_slot(task_id))
                .set(yield TaskLogEntrypoint.log_slot_for(state_service, db, task_id));
        }
    }
}