const tg = window.Telegram?.WebApp;
tg?.ready();
tg?.expand();

const state = {
  user: null,
  authConfig: null,
  detail: null,
};

function orderId() {
  return Number(new URLSearchParams(window.location.search).get("id") || 0);
}

function authHeaders(extra = {}) {
  const headers = { ...extra };
  if (tg?.initData) headers["X-Telegram-Init-Data"] = tg.initData;
  if (!tg?.initData && state.authConfig?.allow_dev_auth) {
    headers["X-Dev-Telegram-Id"] = localStorage.getItem("driversDevTelegramId") || "1";
  }
  return headers;
}

async function api(path, options = {}) {
  const { headers: optionHeaders = {}, ...fetchOptions } = options;
  const headers = { "Content-Type": "application/json", ...authHeaders(optionHeaders) };
  const response = await fetch(`/api${path}`, { ...fetchOptions, headers });
  if (!response.ok) throw new Error(await response.text() || response.statusText);
  if (response.status === 204) return null;
  return response.json();
}

async function loadAuthConfig() {
  state.authConfig = await api("/users/auth/config");
}

async function ensureUser() {
  if (tg?.initData) {
    state.user = await api("/users/webapp-auth", {
      method: "POST",
      body: JSON.stringify({ init_data: tg.initData }),
    });
  } else if (state.authConfig?.allow_dev_auth) {
    state.user = await api("/users/me");
  } else {
    showAuthOverlay();
    throw new Error("Требуется вход через Telegram");
  }
  document.body.classList.remove("auth-required");
  document.querySelector("#authOverlay")?.classList.add("hidden");
}

function showAuthOverlay() {
  document.body.classList.add("auth-required");
  const botUsername = state.authConfig?.bot_username;
  const link = document.querySelector("#telegramLoginLink");
  if (botUsername && link) {
    link.href = `https://t.me/${botUsername}`;
    link.classList.remove("hidden");
  }
}

function toast(message, tone = "success") {
  const node = document.querySelector("#toast");
  if (!node) return;
  node.textContent = message;
  node.className = `toast ${tone}`;
  window.clearTimeout(toast.timer);
  toast.timer = window.setTimeout(() => node.classList.add("hidden"), 2600);
}

function money(value, currency = "RUB") {
  return Number(value || 0).toLocaleString("ru-RU", {
    style: "currency",
    currency,
    maximumFractionDigits: currency === "KRW" ? 0 : 2,
  });
}

function escapeHtml(value) {
  return String(value ?? "")
    .replace(/&/g, "&")
    .replace(/</g, "&lt;")
    .replace(/>/g, "&gt;")
    .replace(/"/g, "&quot;");
}

function statusLabel(status) {
  return {
    draft: "Черновик",
    diagnosis: "Диагностика",
    waiting_owner_approval: "Ждет согласования",
    approved_by_owner: "Согласован",
    rejected_by_owner: "Отклонен",
    in_progress: "В работе",
    completed: "Завершен",
    cancelled: "Отменен",
  }[status] || status || "Без статуса";
}

function itemTotal(item) {
  return item.total ?? item.price ?? Number(item.quantity || 0) * Number(item.unit_price || 0);
}

function renderItems(rootSelector, items, emptyText) {
  const root = document.querySelector(rootSelector);
  root.innerHTML = items.length
    ? items.map((item) => `
      <div class="stack-item work-order-card">
        <strong>${escapeHtml(item.title)}</strong>
        ${item.description ? `<small>${escapeHtml(item.description)}</small>` : ""}
        <small>${Number(item.quantity || 1)} ${escapeHtml(item.unit || "шт")} × ${money(item.unit_price || item.price || 0, state.detail.visit.currency)}</small>
        <div class="work-order-totals single-total">
          <span>Сумма: <strong>${money(itemTotal(item), state.detail.visit.currency)}</strong></span>
        </div>
      </div>
    `).join("")
    : `<div class="empty">${emptyText}</div>`;
}

function renderDecision(detail) {
  const status = detail.visit.status;
  const isWaiting = status === "waiting_owner_approval";
  document.querySelector("#approveBtn").classList.toggle("hidden", !isWaiting);
  document.querySelector("#rejectBtn").classList.toggle("hidden", !isWaiting);
  document.querySelector("#ownerComment").disabled = !isWaiting;
  if (isWaiting) {
    document.querySelector("#decisionTitle").textContent = "Нужно ваше решение";
    document.querySelector("#decisionText").textContent = "Проверьте работы, материалы и итоговую сумму. Решение попадет в историю заказ-наряда.";
    return;
  }
  if (status === "approved_by_owner") {
    document.querySelector("#decisionTitle").textContent = "Заказ-наряд согласован";
    document.querySelector("#decisionText").textContent = "СТО может выполнять и закрывать работы по согласованной смете.";
    return;
  }
  if (status === "completed") {
    document.querySelector("#decisionTitle").textContent = "Работы завершены";
    document.querySelector("#decisionText").textContent = "Заказ-наряд сохранен в истории автомобиля.";
    return;
  }
  document.querySelector("#decisionTitle").textContent = "Решение сейчас не требуется";
  document.querySelector("#decisionText").textContent = "Когда СТО отправит смету на согласование, здесь появятся кнопки решения.";
}

function renderProfileLink(detail) {
  const link = document.querySelector("#fillProfileLink");
  const missing = detail.catalog?.missing_vehicle_fields || [];
  if (!missing.length || detail.visit.status === "completed") {
    link.classList.add("hidden");
    return;
  }
  link.href = `/car_profile.html?car_id=${detail.vehicle.id}`;
  link.classList.remove("hidden");
}

async function loadDetail() {
  const id = orderId();
  if (!id) throw new Error("Не указан заказ-наряд");
  state.detail = await api(`/work-orders/${id}/detail`);
  const detail = state.detail;
  document.querySelector("#centerName").textContent = detail.service_center.display_name || detail.service_center.name;
  document.querySelector("#orderTitle").textContent = detail.visit.work_order_number || `Заказ-наряд #${detail.visit.id}`;
  document.querySelector("#vehicleMeta").textContent = [
    detail.vehicle.name,
    detail.vehicle.license_plate_display,
    detail.visit.odometer ? `${detail.visit.odometer} км` : "",
  ].filter(Boolean).join(" · ");
  document.querySelector("#statusBadge").textContent = statusLabel(detail.visit.status);
  document.querySelector("#orderTotal").textContent = money(detail.visit.final_total || detail.visit.total_cost || 0, detail.visit.currency);
  document.querySelector("#ownerComment").value = detail.visit.owner_comment || "";
  renderItems("#laborList", detail.work_items || [], "Работы пока не добавлены");
  renderItems("#productList", detail.product_items || [], "Материалы пока не добавлены");
  renderDecision(detail);
  renderProfileLink(detail);
}

async function decide(action) {
  const id = orderId();
  const comment = document.querySelector("#ownerComment").value.trim() || null;
  const button = action === "approve" ? document.querySelector("#approveBtn") : document.querySelector("#rejectBtn");
  button.disabled = true;
  try {
    await api(`/work-orders/${id}/${action}`, {
      method: "POST",
      body: JSON.stringify({ comment }),
    });
    toast(action === "approve" ? "Заказ-наряд согласован" : "Заказ-наряд отклонен");
    await loadDetail();
  } catch (error) {
    console.error(error);
    toast(error.message || "Ошибка", "error");
  } finally {
    button.disabled = false;
  }
}

document.querySelector("#refreshBtn").addEventListener("click", () => loadDetail());
document.querySelector("#approveBtn").addEventListener("click", () => decide("approve"));
document.querySelector("#rejectBtn").addEventListener("click", () => decide("reject"));
document.querySelector("#telegramRetryBtn").addEventListener("click", () => window.location.reload());

Promise.all([loadAuthConfig()])
  .then(() => ensureUser())
  .then(() => loadDetail())
  .catch((error) => {
    if (error.message === "Требуется вход через Telegram") return;
    console.error(error);
    toast(error.message || "Ошибка", "error");
  });