root
48 lines
1.9 KiB
TypeScript
48 lines
1.9 KiB
TypeScript
// SPEC: PJ2026-010404 project management draft-2026-06-25-p0-mdtodo-web-active-editing-hwpod-source.
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// 职责：根据节点自身及全部后代推导只用于展示的 TaskTree 父级时间范围。
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export type TaskTreeTimedNode = {
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id: string;
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parentId: string | null;
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startAt: string | null;
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dueAt: string | null;
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};
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export type TaskTreeTimeRange = Pick<TaskTreeTimedNode, "startAt" | "dueAt">;
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export function deriveEffectiveTaskTimeRanges(tasks: TaskTreeTimedNode[]): Map<string, TaskTreeTimeRange> {
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const tasksById = new Map(tasks.map((task) => [task.id, task]));
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const childrenByParent = new Map<string, TaskTreeTimedNode[]>();
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for (const task of tasks) {
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if (!task.parentId || !tasksById.has(task.parentId)) continue;
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childrenByParent.set(task.parentId, [...(childrenByParent.get(task.parentId) ?? []), task]);
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}
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const ranges = new Map<string, TaskTreeTimeRange>();
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const resolving = new Set<string>();
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const resolve = (task: TaskTreeTimedNode): TaskTreeTimeRange => {
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const cached = ranges.get(task.id);
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if (cached) return cached;
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if (resolving.has(task.id)) return { startAt: task.startAt, dueAt: task.dueAt };
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resolving.add(task.id);
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const values = [task.startAt, task.dueAt];
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for (const child of childrenByParent.get(task.id) ?? []) {
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const childRange = resolve(child);
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values.push(childRange.startAt, childRange.dueAt);
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}
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const timestamps = values
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.filter((value): value is string => Boolean(value))
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.map((value) => new Date(value).getTime())
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.filter(Number.isFinite);
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const range = timestamps.length > 0
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? { startAt: new Date(Math.min(...timestamps)).toISOString(), dueAt: new Date(Math.max(...timestamps)).toISOString() }
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: { startAt: null, dueAt: null };
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resolving.delete(task.id);
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ranges.set(task.id, range);
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return range;
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};
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for (const task of tasks) resolve(task);
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return ranges;
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}
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