import type { Task } from "@fusion/core";
import { getUnifiedTaskProgress } from "./taskProgress";

/** The shared status vocabulary for active task phases and lock/model policy. */
export const ACTIVE_STATUSES = new Set([
  "planning",
  "researching",
  "executing",
  "finalizing",
  "merging",
  "merging-pr",
  "merging-fix",
  "reviewing",
  "landing",
]);

export const RECENT_PLANNER_ACTIVITY_WINDOW_MS = 60_000;

export interface TaskAgentActivityOptions {
  globalPaused?: boolean;
  queued?: boolean;
  isStuck?: boolean;
}

/*
FNXC:TaskActivity 2026-07-16-00:00:
FN-8055 makes the agent-active border and pulsing badges represent the same ground truth: an agent is working now. Reject render-context global pause, queue, and derived freshness-stuck gates before checking activity, then combine the engine's column-aware active window with canonical phase statuses and the running unified workflow item that drives progress badges.

FNXC:TaskActivity 2026-07-28-12:00:
FN-8300 also honors a bounded, client-only fresh planner-log timestamp for triage cards. The log stream can arrive before the authoritative planning-status row; this render-only fallback closes that window without changing routing/model locks.

Stuck-killed and both terminal columns are never active, even when stale execution status or workflow-step data remains on the task.

Model-resolution and routing locks intentionally import only ACTIVE_STATUSES and retain their status-or-in-progress policy; using this rendering predicate there would change lock behavior during status-null workflow steps.
*/
export function isTaskAgentActive(
  task: Pick<Task, "column" | "status" | "paused" | "userPaused" | "steps" | "enabledWorkflowSteps" | "workflowStepResults" | "recentAgentActivityAt">,
  options: TaskAgentActivityOptions = {},
): boolean {
  const status = task.status;

  if (
    options.globalPaused === true ||
    options.queued === true ||
    options.isStuck === true ||
    status === "queued" ||
    status === "stuck-killed" ||
    task.paused === true ||
    task.userPaused === true ||
    status === "paused" ||
    status === "failed" ||
    status === "awaiting-approval" ||
    status === "awaiting-user-input" ||
    task.column === "done" ||
    task.column === "archived" ||
    status === "done"
  ) {
    return false;
  }

  const recentPlannerActivityAtMs = Date.parse(task.recentAgentActivityAt ?? "");
  const nowMs = Date.now();
  const hasFreshPlannerActivity = task.column === "triage"
    && Number.isFinite(recentPlannerActivityAtMs)
    && nowMs - recentPlannerActivityAtMs >= 0
    && nowMs - recentPlannerActivityAtMs <= RECENT_PLANNER_ACTIVITY_WINDOW_MS;

  return task.column === "in-progress" ||
    ACTIVE_STATUSES.has(status ?? "") ||
    hasFreshPlannerActivity ||
    getUnifiedTaskProgress(task).items.some((item) => item.status === "running");
}