import { NextResponse } from "next/server";

import { updateTask, validateTaskPayload } from "@/lib/tasks";

export async function PATCH(
  request: Request,
  { params }: { params: Promise<{ id: string }> },
) {
  const { id } = await params;
  const numericId = Number(id);
  if (!Number.isInteger(numericId) || numericId <= 0) {
    return NextResponse.json({ error: "invalid_task_id" }, { status: 400 });
  }

  const payload = (await request.json()) as Record<string, unknown>;
  const errors = validateTaskPayload(payload as never, true);
  if (errors.length > 0) {
    return NextResponse.json({ error: "validation_error", details: errors }, { status: 400 });
  }

  const task = await updateTask(numericId, {
    title: typeof payload.title === "string" ? payload.title : undefined,
    description: typeof payload.description === "string" ? payload.description : undefined,
    assignee: typeof payload.assignee === "string" ? payload.assignee : undefined,
    priority: payload.priority as never,
    status: payload.status as never,
    tags: Array.isArray(payload.tags) ? payload.tags.filter((tag) => typeof tag === "string") : undefined,
  });

  if (!task) {
    return NextResponse.json({ error: "task_not_found" }, { status: 404 });
  }

  return NextResponse.json(task);
}