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It is a process-level singleton because the tool that\n * creates tasks and the footer that renders them live in the same process and\n * there is no cross-process boundary to cross.\n */\n\n/**\n * `cancelled` is a user-initiated stop (Esc/abort mid-run) — deliberately\n * distinct from `failed` so the panel doesn't paint an intentional interrupt\n * as an error.\n */\nexport type TaskStatus = \"pending\" | \"in_progress\" | \"done\" | \"failed\" | \"cancelled\";\n\n/**\n * What kind of background work owns a task, surfaced as a source glyph in the\n * pane. Unset means the main agent. A \"team\" origin is reserved for the\n * hooteams integration and stays unwired until that lands.\n */\nexport type TaskSource = \"subagent\" | \"mcp\";\n\n/**\n * Kind of agent that can own tasks in the pane's grouped views:\n * the main session (orchestrator), a spawned subagent, or a named\n * team role-agent (e.g. fed by a hooteams bridge).\n */\nexport type TaskAgentKind = \"main\" | \"subagent\" | \"role\";\n\n/** Lifecycle word shown as the agent's `[state]` tag in grouped views. */\nexport type TaskAgentState = \"active\" | \"running\" | \"done\" | \"queued\" | \"idle\" | \"waiting\" | \"failed\" | \"cancelled\";\n\n/**\n * An agent that owns tasks, rendered as a group header in the pane's\n * `subagents` / `teams` views. Subagent dispatches register themselves here;\n * external orchestrators (hooteams) can upsert role-agents with handoffs.\n */\nexport interface TaskAgent {\n\treadonly id: string;\n\tname: string;\n\t/** Short descriptor after the name: \"orchestrator\", \"subagent\", or a team role like \"architect\". */\n\trole?: string;\n\tkind: TaskAgentKind;\n\tstate?: TaskAgentState;\n\t/** Handoff arrow text for team views (e.g. \"→ reviewer\", \"← builder\"). */\n\thandoff?: string;\n\t/**\n\t * Live activity descriptor for a running subagent (e.g. the tool it is\n\t * currently executing), fed by the pool's `task_progress` events. Empty string\n\t * means \"no current activity\" — `applyAgentPatch` skips `undefined`, so callers\n\t * clear it by patching `\"\"`, not `undefined`.\n\t */\n\tactivity?: string;\n\t/** Per-agent token + cost totals, shown right-aligned on the group header. */\n\tstats?: { input: number; output: number; cost: number };\n}\n\nexport interface Task {\n\treadonly id: number;\n\ttitle: string;\n\tstatus: TaskStatus;\n\t/** Origin of the task (subagent delegation vs MCP tool call; unset = main agent); drives the pane's source glyph. */\n\tsource?: TaskSource;\n\t/**\n\t * Origin label shown as the row's `[tag]` in the task pane: the subagent\n\t * type for delegations (e.g. \"explore\"), the MCP server name for MCP tasks\n\t * (e.g. \"github\").\n\t */\n\tsubagentMode?: string;\n\t/** Id of the owning TaskAgent; drives grouping in the pane's subagents/teams views. */\n\tagent?: string;\n\t/**\n\t * Id of the task that spawned this one, linking a dispatched subagent (and its\n\t * own delegations) back to the Task call that created it. Root tasks omit it.\n\t * Drives the subagents lens's recursive task tree: a node's children are the\n\t * tasks whose `parentTaskId` is its id, so nesting deeper than one level (a\n\t * subagent that spawns a subagent) is visible. Set when a child subagent's task\n\t * subtree is merged into the parent (see finalizeDispatchResult).\n\t */\n\tparentTaskId?: number;\n\t/**\n\t * Id of the main-agent (TodoWrite) task this run is working on, set at\n\t * dispatch time when exactly one plan item is in_progress. Purely a display\n\t * link: the flat (\"tasks\") lens nests the run under its plan item so the\n\t * plan and the agents executing it read as one picture. Deliberately NOT\n\t * `parentTaskId` — that field drives the subagents tree and the\n\t * cross-process subtree merge, and overloading it would move runs between\n\t * lenses. A dangling link (the todo was removed/replaced) is simply not\n\t * rendered.\n\t */\n\tlinkedTaskId?: number;\n\t/**\n\t * Short warning note surfaced as a ⚠ cue in the task pane (e.g. the subagent\n\t * fell back to the inherited model, or was skipped because the provider was\n\t * exhausted). Kept terse so it fits the row's right column.\n\t */\n\tnote?: string;\n\t/**\n\t * Canonical TodoWrite item content for main-plan tasks. `title` is the\n\t * *display* form and legitimately changes between `content` and `activeForm`\n\t * as the item's status moves, so it cannot identify an item across TodoWrite\n\t * calls. This field can: the tool reconciles incoming items against it by\n\t * identity first (position only as a fallback), keeping task ids — and the\n\t * subagent runs linked to them — attached to the same plan item when the\n\t * list is reordered or shrunk.\n\t */\n\ttodoContent?: string;\n\treadonly createdAt: number;\n\tupdatedAt: number;\n\t/** Token and cost usage attributed to this task (e.g. from a subagent session). */\n\tusage?: {\n\t\tinput: number;\n\t\toutput: number;\n\t\tcacheRead: number;\n\t\tcacheWrite: number;\n\t\tcost: number;\n\t};\n}\n\ninterface CreateTaskOptions {\n\tsource?: TaskSource;\n\tsubagentMode?: string;\n\tagent?: string;\n\tparentTaskId?: number;\n\tlinkedTaskId?: number;\n}\n\ntype TaskPatch = Partial<\n\tPick<\n\t\tTask,\n\t\t| \"title\"\n\t\t| \"status\"\n\t\t| \"source\"\n\t\t| \"subagentMode\"\n\t\t| \"agent\"\n\t\t| \"usage\"\n\t\t| \"note\"\n\t\t| \"parentTaskId\"\n\t\t| \"linkedTaskId\"\n\t\t| \"todoContent\"\n\t>\n>;\n\ntype TaskAgentPatch = Partial<Omit<TaskAgent, \"id\">>;\n\n/**\n * Owner group for a task when no explicit agent is set: subagent-sourced work\n * falls into a generic \"subagent\" group, everything else belongs to main.\n * Shared by the store's reset() and the pane's grouped views so the two never\n * disagree about which agents still own live tasks.\n */\nexport function taskOwnerId(task: Pick<Task, \"agent\" | \"source\">): string {\n\tif (task.agent) return task.agent;\n\treturn task.source === \"subagent\" ? \"subagent\" : \"main\";\n}\n\ntype Listener = () => void;\n\nclass TaskStore {\n\tprivate tasks: Task[] = [];\n\tprivate taskAgents: TaskAgent[] = [];\n\tprivate nextId = 1;\n\tprivate readonly listeners = new Set<Listener>();\n\tprivate batchDepth = 0;\n\tprivate mutationCount = 0;\n\n\t/**\n\t * Monotonic counter bumped on every mutation (including those inside a\n\t * batch). Lets renderers cache derived state and invalidate it cheaply by\n\t * comparing versions instead of deep-diffing tasks/agents.\n\t */\n\tversion(): number {\n\t\treturn this.mutationCount;\n\t}\n\n\t/**\n\t * Run a series of mutations without notifying listeners until the batch\n\t * completes, so the TUI renders once instead of per-item. Nested batches are\n\t * supported: only the outermost batch flushes.\n\t */\n\tbatch(fn: () => void): void {\n\t\tthis.batchDepth++;\n\t\ttry {\n\t\t\tfn();\n\t\t} finally {\n\t\t\tthis.batchDepth--;\n\t\t\tif (this.batchDepth === 0) this.emit();\n\t\t}\n\t}\n\n\tcreate(title: string, options: CreateTaskOptions = {}): Task {\n\t\tconst now = Date.now();\n\t\tconst task: Task = {\n\t\t\tid: this.nextId++,\n\t\t\ttitle: title.trim() || \"(untitled task)\",\n\t\t\tstatus: \"pending\",\n\t\t\tsource: options.source,\n\t\t\tsubagentMode: options.subagentMode,\n\t\t\tagent: options.agent,\n\t\t\tparentTaskId: options.parentTaskId,\n\t\t\tlinkedTaskId: options.linkedTaskId,\n\t\t\tcreatedAt: now,\n\t\t\tupdatedAt: now,\n\t\t};\n\t\tthis.tasks.push(task);\n\t\tthis.emit();\n\t\treturn task;\n\t}\n\n\tupdate(id: number, patch: TaskPatch): void {\n\t\tconst task = this.tasks.find((t) => t.id === id);\n\t\tif (!task) {\n\t\t\tconsole.warn(`[task-store] update: unknown task id ${id}`);\n\t\t\treturn;\n\t\t}\n\t\tif (patch.title !== undefined) task.title = patch.title;\n\t\tif (patch.status !== undefined) task.status = patch.status;\n\t\tif (patch.source !== undefined) task.source = patch.source;\n\t\tif (patch.subagentMode !== undefined) task.subagentMode = patch.subagentMode;\n\t\tif (patch.agent !== undefined) task.agent = patch.agent;\n\t\tif (patch.parentTaskId !== undefined) task.parentTaskId = patch.parentTaskId;\n\t\tif (patch.linkedTaskId !== undefined) task.linkedTaskId = patch.linkedTaskId;\n\t\tif (patch.todoContent !== undefined) task.todoContent = patch.todoContent;\n\t\tif (patch.usage !== undefined) task.usage = patch.usage;\n\t\t// `note` is clearable: passing `note: undefined` explicitly removes a stale\n\t\t// ⚠ cue (e.g. a warning from a previous run of the same task row). Callers\n\t\t// that don't mention `note` leave it untouched.\n\t\tif (\"note\" in patch) task.note = patch.note;\n\t\ttask.updatedAt = Date.now();\n\t\tthis.emit();\n\t}\n\n\t/**\n\t * Register or update an agent for the grouped task views. Merges into an\n\t * existing entry with the same id (accumulated stats survive a re-dispatch);\n\t * creates it otherwise.\n\t */\n\tupsertAgent(agent: { id: string } & TaskAgentPatch & Pick<TaskAgent, \"name\" | \"kind\">): TaskAgent {\n\t\tconst existing = this.taskAgents.find((a) => a.id === agent.id);\n\t\tif (existing) {\n\t\t\tthis.applyAgentPatch(existing, agent);\n\t\t\tthis.emit();\n\t\t\treturn existing;\n\t\t}\n\t\tconst created: TaskAgent = {\n\t\t\tid: agent.id,\n\t\t\tname: agent.name,\n\t\t\trole: agent.role,\n\t\t\tkind: agent.kind,\n\t\t\tstate: agent.state,\n\t\t\thandoff: agent.handoff,\n\t\t\tactivity: agent.activity,\n\t\t\tstats: agent.stats,\n\t\t};\n\t\tthis.taskAgents.push(created);\n\t\tthis.emit();\n\t\treturn created;\n\t}\n\n\t/** Patch an existing agent (state/handoff/stats…). Unknown ids are ignored. */\n\tpatchAgent(id: string, patch: TaskAgentPatch): void {\n\t\tconst agent = this.taskAgents.find((a) => a.id === id);\n\t\tif (!agent) return;\n\t\tthis.applyAgentPatch(agent, patch);\n\t\tthis.emit();\n\t}\n\n\t/** Add a usage delta to an agent's running totals (creating them at zero). */\n\taddAgentStats(id: string, delta: { input?: number; output?: number; cost?: number }): void {\n\t\tconst agent = this.taskAgents.find((a) => a.id === id);\n\t\tif (!agent) {\n\t\t\tconsole.warn(`[task-store] addAgentStats: unknown agent id \"${id}\"`);\n\t\t\treturn;\n\t\t}\n\t\tconst stats = agent.stats ?? { input: 0, output: 0, cost: 0 };\n\t\tstats.input += delta.input ?? 0;\n\t\tstats.output += delta.output ?? 0;\n\t\tstats.cost += delta.cost ?? 0;\n\t\tagent.stats = stats;\n\t\tthis.emit();\n\t}\n\n\tagents(): readonly TaskAgent[] {\n\t\treturn this.taskAgents;\n\t}\n\n\tprivate applyAgentPatch(agent: TaskAgent, patch: TaskAgentPatch): void {\n\t\tif (patch.name !== undefined) agent.name = patch.name;\n\t\tif (patch.role !== undefined) agent.role = patch.role;\n\t\tif (patch.kind !== undefined) agent.kind = patch.kind;\n\t\tif (patch.state !== undefined) agent.state = patch.state;\n\t\tif (patch.activity !== undefined) agent.activity = patch.activity;\n\t\tif (patch.handoff !== undefined) agent.handoff = patch.handoff;\n\t\tif (patch.stats !== undefined) agent.stats = patch.stats;\n\t}\n\n\tremove(id: number): void {\n\t\tconst idx = this.tasks.findIndex((t) => t.id === id);\n\t\tif (idx === -1) return;\n\t\tthis.tasks.splice(idx, 1);\n\t\tthis.emit();\n\t}\n\n\t/**\n\t * Arrange the given tasks (by id) into the specified relative order, keeping\n\t * every other task fixed: the matched tasks permute among their existing\n\t * array slots. Lets TodoWrite render the plan in list order while ids stay\n\t * pinned to their items (its identity-based reconcile). Ignored unless every\n\t * id resolves to a task.\n\t */\n\tarrange(ids: readonly number[]): void {\n\t\tconst byId = new Map(this.tasks.map((t) => [t.id, t]));\n\t\tconst ordered = ids.map((id) => byId.get(id)).filter((t): t is Task => t !== undefined);\n\t\tif (ordered.length !== ids.length) return;\n\t\tconst idSet = new Set(ids);\n\t\tconst slots: number[] = [];\n\t\tfor (let i = 0; i < this.tasks.length; i++) {\n\t\t\tif (idSet.has(this.tasks[i]!.id)) slots.push(i);\n\t\t}\n\t\tif (slots.length !== ordered.length) return;\n\t\tfor (let k = 0; k < slots.length; k++) {\n\t\t\tthis.tasks[slots[k]!] = ordered[k]!;\n\t\t}\n\t\tthis.emit();\n\t}\n\n\t/**\n\t * Drop finished tasks and restart numbering from #1 once the pane is empty.\n\t *\n\t * Called when a new user message arrives: finished tasks from the previous turn\n\t * stay visible (with their final status) for the whole turn and are wiped only\n\t * when the user starts the next turn, so the next turn opens with an empty pane\n\t * and its first task is #1 again. Active (pending/in_progress) tasks are kept —\n\t * a follow-up/steer message can arrive while a subagent is still running, and\n\t * dropping its task here would orphan the live work (its later status update\n\t * would target a removed id and silently vanish). Numbering only restarts once\n\t * no active task survives, so ids never collide with a kept task.\n\t * Agents with accumulated stats are preserved across resets so cross-turn cost\n\t * accounting survives.\n\t */\n\treset(): void {\n\t\tconst active = this.tasks.filter((t) => t.status === \"pending\" || t.status === \"in_progress\");\n\t\tif (active.length === this.tasks.length && this.nextId === 1) return;\n\t\tthis.tasks = active;\n\t\t// Subagent rows are per-run (one roster entry per dispatch), so a settled\n\t\t// run whose task was just dropped is dead weight — keeping it would grow\n\t\t// the roster without bound across turns. Role/main agents with non-zero\n\t\t// accumulated stats survive so cross-turn team cost accounting holds.\n\t\tconst hasStats = (a: TaskAgent) => a.stats && (a.stats.input > 0 || a.stats.output > 0 || a.stats.cost > 0);\n\t\tif (active.length === 0) {\n\t\t\tthis.nextId = 1;\n\t\t\tthis.taskAgents = this.taskAgents.filter((a) => a.kind !== \"subagent\" && hasStats(a));\n\t\t} else {\n\t\t\tconst liveOwners = new Set(active.map(taskOwnerId));\n\t\t\tthis.taskAgents = this.taskAgents.filter(\n\t\t\t\t(a) => liveOwners.has(a.id) || (a.kind !== \"subagent\" && hasStats(a)),\n\t\t\t);\n\t\t}\n\t\tthis.emit();\n\t}\n\n\tlist(): readonly Task[] {\n\t\treturn this.tasks;\n\t}\n\n\t/** Wipe all tasks and restart numbering. Intended for test isolation only. */\n\tclear(): void {\n\t\tthis.tasks = [];\n\t\tthis.taskAgents = [];\n\t\tthis.nextId = 1;\n\t\tthis.emit();\n\t}\n\n\tsubscribe(listener: Listener): () => void {\n\t\tthis.listeners.add(listener);\n\t\treturn () => {\n\t\t\tthis.listeners.delete(listener);\n\t\t};\n\t}\n\n\tprivate emit(): void {\n\t\tthis.mutationCount++;\n\t\tif (this.batchDepth > 0) return;\n\t\tfor (const listener of this.listeners) {\n\t\t\tlistener();\n\t\t}\n\t}\n}\n\n/** Shared, process-wide task store. */\nexport const taskStore = new TaskStore();\n"]}