/**
 * @file app/(app)/dashboard/page.tsx
 * @description Server component rendering the main dashboard page using the TaskService with DB search filtering.
 */

import { auth } from "@/auth";
import { redirect } from "next/navigation";
import Board from "./Board";
import { Task } from "@/lib/types/task";
import { DbUser } from "@/lib/types/user";
import { TaskService } from "@/lib/services/task.service";

/**
 * Renders the primary dashboard view after performing authentication checks,
 * executing database queries for task data with optional search filters,
 * and structuring creator and assignee relationships.
 *
 * @async
 * @param {Object} props - The component props.
 * @param {Promise<{ search?: string }>} props.searchParams - Promise resolving to the current URL search parameters.
 * @returns {Promise<JSX.Element>} The rendered dashboard page component.
 */
export default async function Dashboard({
  searchParams,
}: {
  searchParams: Promise<{ search?: string }>;
}) {
  const session = await auth();
  if (!session?.user?.id) redirect("/login");

  const currentUserId = session.user.id;
  const { search } = await searchParams;
  const searchQuery = search?.trim() || "";

  // The search is passed directly to the SQL query
  const rawTasksWithCreator = await TaskService.findActiveTasksForUser(
    currentUserId,
    searchQuery,
  );

  const allTaskIds = rawTasksWithCreator.map((item) => item.task.id);
  const assigneesData = await TaskService.findAssigneesForTasks(allTaskIds);

  const assigneesMap = new Map<string, DbUser[]>();
  for (const row of assigneesData) {
    const existing = assigneesMap.get(row.taskId) || [];
    assigneesMap.set(row.taskId, [...existing, row.user]);
  }

  const tasks: Task[] = rawTasksWithCreator.map(({ task, user }) => ({
    ...task,
    creator: user,
    assignees: assigneesMap.get(task.id) || [],
    isCreator: task.userId === currentUserId,
  }));

  return (
    <div className="space-y-8 max-w-7xl mx-auto pb-12">
      <Board tasks={tasks} />
    </div>
  );
}