# All files / src/utils boardColumns.ts

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     /**
     * Pure helpers for bucketing tasks into Kanban board columns.
     *
     * Unlike the sidebar `groupTasksByStatus()` (which adds a virtual "blocked"
     * group), the board keeps blocked tasks in their actual-status column and
     * overlays a badge.
     */

    import type { TaskData } from "../hooks/types.js";
    import {
      BOARD_COLUMN_ORDER,
      getStatusStyle,
      resolveStatus,
      type TaskStatusKey,
      type TaskStatusStyle,
    } from "./taskStatus.js";

    // ---------------------------------------------------------------------------
    // Types
    // ---------------------------------------------------------------------------

    /** Represents a single column on the Kanban board. */
    export interface BoardColumn {
      /** Canonical status key (e.g. "working"). */
      status: TaskStatusKey;
      /** Human-readable column heading. */
      label: string;
      /** Visual style for the column header. */
      style: TaskStatusStyle;
      /** Tasks in this column, sorted by `sortOrder`. */
      tasks: BoardTask[];
    }

    /** A task decorated with board-specific computed properties. */
    export interface BoardTask {
      /** Original task data. */
      task: TaskData;
      /** True when the task has unresolved dependencies. */
      isBlocked: boolean;
      /** Number of direct child tasks. */
      childCount: number;
      /** Number of direct child tasks that are complete. */
      doneChildCount: number;
      /** Paused sub-badge label derived from latest session status. */
      pausedSubBadge?: "Needs input" | "Ready to complete";
    }

    // ---------------------------------------------------------------------------
    // Bucketing
    // ---------------------------------------------------------------------------

    /** Options for building board columns. */
    interface BuildColumnsOptions {
      /** Flat list of tasks belonging to one workspace. */
      tasks: TaskData[];
      /** Map of taskId → status for all tasks (used for dependency checking). */
      taskStatusById: Map<string, string>;
      /** Map of taskId → latest session status (used for paused sub-badges). */
      sessionStatusByTaskId?: Map<string, string>;
    }

    /**
     * Bucket tasks into fixed board columns.
     *
     * - Always returns all five columns (empty ones get an empty `tasks` array).
     * - Resolves legacy status aliases to canonical keys.
     * - Sorts tasks within each column by `sortOrder`.
     * - Computes blocked state and child-progress counts.
     * - Derives paused sub-badges from the latest session status.
     */
    export function buildBoardColumns({
      tasks,
      taskStatusById,
      sessionStatusByTaskId,
    }: BuildColumnsOptions): BoardColumn[] {
      // Index children by parent
      const childrenByParent = new Map<string, TaskData[]>();
      for (const t of tasks) {
        if (t.parentTaskId) {
          const list = childrenByParent.get(t.parentTaskId);
          if (list) {
            list.push(t);
          } else {
            childrenByParent.set(t.parentTaskId, [t]);
          }
        }
      }

      // Pre-build empty buckets keyed by status
      const buckets = new Map<TaskStatusKey, BoardTask[]>(BOARD_COLUMN_ORDER.map((s) => [s, []]));

      for (const task of tasks) {
        const column = resolveStatus(task.status);
        const isBlocked =
          task.dependsOn.length > 0 &&
          task.dependsOn.some((depId) => taskStatusById.get(depId) !== "complete");

        const children = childrenByParent.get(task.id) ?? [];
        const childCount = children.length;
        const doneChildCount = children.filter((c) => c.status === "complete").length;

        let pausedSubBadge: BoardTask["pausedSubBadge"];
        if (column === "paused" && sessionStatusByTaskId) {
          const sessionStatus = sessionStatusByTaskId.get(task.id);
          if (sessionStatus === "idle") {
            pausedSubBadge = "Needs input";
          } else if (sessionStatus === "completed") {
            pausedSubBadge = "Ready to complete";
          }
        }

        const boardTask: BoardTask = {
          task,
          isBlocked,
          childCount,
          doneChildCount,
          pausedSubBadge,
        };

        const bucket = buckets.get(column);
        if (bucket) {
          bucket.push(boardTask);
        } else {
          // Unknown status → fall back to not_started column
          buckets.get("not_started")!.push(boardTask);
        }
      }

      // Sort tasks in each bucket by sortOrder
      for (const columnTasks of buckets.values()) {
        columnTasks.sort((a, b) => a.task.sortOrder - b.task.sortOrder);
      }

      // Build final column array in display order
      return BOARD_COLUMN_ORDER.map((status) => {
        const style = getStatusStyle(status);

        return {
          status,
          label: style.label,
          style,
          tasks: buckets.get(status) ?? [],
        };
      });
    }