import { NextRequest, NextResponse } from "next/server";
import {
  archiveTask,
  createTask,
  listTasks,
  updateTask,
} from "@/lib/tasks";
import type { TaskSort } from "@/types/task";

export const runtime = "nodejs";

const sortOptions: TaskSort[] = ["createdAt", "topic", "status", "dueDate"];

function parseSort(value: string | null): TaskSort {
  if (value && sortOptions.includes(value as TaskSort)) {
    return value as TaskSort;
  }

  return "createdAt";
}

function errorResponse(error: unknown, status = 400) {
  return NextResponse.json(
    { error: error instanceof Error ? error.message : "Something went wrong." },
    { status }
  );
}

export function GET(request: NextRequest) {
  const includeArchived =
    request.nextUrl.searchParams.get("includeArchived") === "true";
  const sort = parseSort(request.nextUrl.searchParams.get("sort"));
  const tasks = listTasks({ includeArchived, sort });

  return NextResponse.json({ tasks });
}

export async function POST(request: NextRequest) {
  try {
    const body = (await request.json()) as Record<string, unknown>;
    const task = createTask(body);

    return NextResponse.json({ task }, { status: 201 });
  } catch (error) {
    return errorResponse(error);
  }
}

export async function PATCH(request: NextRequest) {
  try {
    const body = (await request.json()) as Record<string, unknown>;
    const id = Number(body.id);

    if (!Number.isInteger(id) || id <= 0) {
      throw new Error("A valid task id is required.");
    }

    const task =
      body.action === "archive" ? archiveTask(id) : updateTask(id, body);

    return NextResponse.json({ task });
  } catch (error) {
    return errorResponse(error);
  }
}