import { NextRequest, NextResponse } from "next/server";

const VIKUNJA_URL = process.env.VIKUNJA_URL || "https://tasks.digital-home.site";
const VIKUNJA_TOKEN = process.env.VIKUNJA_TOKEN || "tk_03787e3778789fd5bfaff0542a8dd9390aae0f82";

const MOCK_TASKS = [
  { id: 1, title: "Записаться на ТО", done: false, priority: 2 },
  { id: 2, title: "Оплатить аренду", done: true, priority: 3 },
  { id: 3, title: "Купить продукты", done: false, priority: 1 },
];

export async function GET() {
  try {
    const today = new Date().toISOString().split("T")[0];
    const res = await fetch(
      `${VIKUNJA_URL}/api/v1/tasks/all?filter_by=due_date&filter_value=${today}&filter_comparator=equals&per_page=20`,
      {
        headers: {
          Authorization: `Bearer ${VIKUNJA_TOKEN}`,
          "Content-Type": "application/json",
        },
        next: { revalidate: 0 },
      }
    );

    if (!res.ok) throw new Error(`Vikunja responded ${res.status}`);
    const data = await res.json();
    return NextResponse.json({ tasks: Array.isArray(data) ? data : [] });
  } catch (e) {
    return NextResponse.json({ tasks: MOCK_TASKS, demo: true });
  }
}

export async function POST(req: NextRequest) {
  const { title } = await req.json();
  if (!title) return NextResponse.json({ error: "Title required" }, { status: 400 });

  const today = new Date();
  today.setHours(23, 59, 59, 0);

  try {
    const res = await fetch(`${VIKUNJA_URL}/api/v1/projects/3/tasks`, {
      method: "PUT",
      headers: {
        Authorization: `Bearer ${VIKUNJA_TOKEN}`,
        "Content-Type": "application/json",
      },
      body: JSON.stringify({
        title,
        due_date: today.toISOString(),
      }),
    });

    if (!res.ok) throw new Error(`Vikunja responded ${res.status}`);
    const task = await res.json();
    return NextResponse.json({ task });
  } catch (e) {
    return NextResponse.json(
      { task: { id: Date.now(), title, done: false }, demo: true }
    );
  }
}

export async function PATCH(req: NextRequest) {
  const { id, done } = await req.json();

  try {
    const res = await fetch(`${VIKUNJA_URL}/api/v1/tasks/${id}`, {
      method: "POST",
      headers: {
        Authorization: `Bearer ${VIKUNJA_TOKEN}`,
        "Content-Type": "application/json",
      },
      body: JSON.stringify({ done }),
    });

    if (!res.ok) throw new Error(`Vikunja responded ${res.status}`);
    return NextResponse.json({ success: true });
  } catch (e) {
    return NextResponse.json({ success: true, demo: true });
  }
}