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

const APPROVED_SERVICE_STATUSES = new Set(["approved", "verified"]);
const STO_WORKPLACE_ROLES = new Set(["owner", "mechanic"]);

const state = {
  user: null,
  authConfig: null,
  centers: [],
  activeCenterId: null,
  appointments: [],
  workOrders: [],
  employees: [],
};

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

function formatDateTime(value) {
  if (!value) return "-";
  const date = new Date(value);
  if (Number.isNaN(date.getTime())) return String(value).slice(0, 16).replace("T", " ");
  return date.toLocaleString("ru-RU", { day: "2-digit", month: "2-digit", hour: "2-digit", minute: "2-digit" });
}

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

function formData(form) {
  return Object.fromEntries(new FormData(form).entries());
}

function numberOrNull(value) {
  return value === "" || value == null ? null : Number(value);
}

function activeCenter() {
  return state.centers.find((center) => center.id === state.activeCenterId) || state.centers[0] || null;
}

function roleLabel(role) {
  return {
    owner: "Владелец",
    manager: "Менеджер",
    receptionist: "Администратор",
    mechanic: "Механик",
  }[role] || role || "Сотрудник";
}

function statusLabel(status) {
  return {
    draft: "Черновик",
    diagnosis: "Диагностика",
    waiting_owner_approval: "Ждет согласования",
    approved_by_owner: "Согласован",
    rejected_by_owner: "Отклонен клиентом",
    in_progress: "В работе",
    completed: "Завершен",
    requested: "Новая заявка",
    confirmed: "Подтверждена",
    confirmed_by_sto: "Подтверждена СТО",
    proposed_new_time: "Предложено другое время",
    invited: "Приглашен",
    active: "Активен",
    inactive: "Отключен",
    revoked: "Отозван",
    expired: "Истекло",
  }[status] || status || "Без статуса";
}

async function loadCenters() {
  const centers = await api("/service-centers/my");
  state.centers = centers.filter((center) =>
    APPROVED_SERVICE_STATUSES.has(center.verification_status) && STO_WORKPLACE_ROLES.has(center.employee_role || "owner"),
  );
  if (!state.activeCenterId && state.centers.length) state.activeCenterId = state.centers[0].id;
  if (state.activeCenterId && !state.centers.some((center) => center.id === state.activeCenterId)) {
    state.activeCenterId = state.centers[0]?.id || null;
  }
}

function renderAccessDenied() {
  document.querySelector("#centerTitle").textContent = "Доступ закрыт";
  document.querySelector("#centerMeta").textContent = "Страница доступна владельцу подтвержденного СТО и активным механикам.";
  document.querySelector("#roleBadge").textContent = "Нет доступа";
  document.querySelector("#centerSelect").innerHTML = "";
  document.querySelector("#dashboardStats").innerHTML = "";
  document.querySelector("#appointmentsList").innerHTML = `<div class="empty">Нет доступного подтвержденного СТО.</div>`;
  document.querySelector("#workOrdersList").innerHTML = `<div class="empty">Рабочее место недоступно.</div>`;
  document.querySelector("#staffPanel").classList.add("hidden");
}

async function loadWorkplace() {
  await loadCenters();
  if (!state.centers.length) {
    renderAccessDenied();
    return;
  }
  const center = activeCenter();
  document.querySelector("#centerSelect").innerHTML = state.centers
    .map((item) => `<option value="${item.id}">${escapeHtml(item.display_name || item.name)}</option>`)
    .join("");
  document.querySelector("#centerSelect").value = String(center.id);
  document.querySelector("#centerTitle").textContent = center.display_name || center.name;
  document.querySelector("#centerMeta").textContent = [center.city, center.address].filter(Boolean).join(", ") || "Адрес не указан";
  document.querySelector("#roleBadge").textContent = roleLabel(center.employee_role || "owner");

  const [dashboard, appointments, visits, employees] = await Promise.all([
    api(`/sto/dashboard?service_center_id=${center.id}`).catch(() => null),
    api(`/sto/appointments?service_center_id=${center.id}`).catch(() => []),
    api(`/service-centers/${center.id}/visits`).catch(() => []),
    center.employee_role === "owner" ? api(`/service-centers/${center.id}/employees`).catch(() => []) : Promise.resolve([]),
  ]);
  state.appointments = appointments.filter((item) => ["requested", "confirmed", "confirmed_by_sto", "proposed_new_time"].includes(item.status));
  state.workOrders = visits.filter((item) => !["completed", "cancelled", "archived", "confirmed", "disputed"].includes(item.status));
  state.employees = employees;
  renderDashboard(dashboard);
  renderAppointments();
  renderWorkOrders();
  renderStaff();
}

function renderDashboard(dashboard) {
  document.querySelector("#dashboardStats").innerHTML = dashboard
    ? `
      <div class="stat-card"><span>Заявки</span><strong>${dashboard.pending_appointments}</strong></div>
      <div class="stat-card"><span>Подтверждено</span><strong>${dashboard.confirmed_appointments}</strong></div>
      <div class="stat-card"><span>Заказ-наряды</span><strong>${dashboard.active_work_orders}</strong></div>
      <div class="stat-card"><span>Авто</span><strong>${dashboard.connected_vehicles}</strong></div>
      <div class="stat-card"><span>Месяц</span><strong>${money(dashboard.revenue_month || 0)}</strong></div>
    `
    : `<div class="empty">Сводка недоступна</div>`;
}

function renderAppointments() {
  const canManage = (activeCenter()?.employee_role || "owner") === "owner";
  document.querySelector("#appointmentsList").innerHTML = state.appointments.length
    ? state.appointments.map((item) => `
      <div class="stack-item work-order-card">
        <strong>${escapeHtml(item.service_name)}</strong>
        <small>${formatDateTime(item.confirmed_start_at || item.requested_start_at)} · авто #${item.vehicle_id}</small>
        <span class="trust-badge">${statusLabel(item.status)}</span>
        ${canManage ? `<div class="row-actions">
          ${item.status === "requested" ? `<button type="button" data-confirm-appointment="${item.id}">Подтвердить</button>` : ""}
          ${["confirmed", "confirmed_by_sto"].includes(item.status) ? `<button type="button" data-create-work-order="${item.id}">Открыть заказ-наряд</button>` : ""}
          <button type="button" class="ghost-btn" data-reject-appointment="${item.id}">Отклонить</button>
        </div>` : ""}
      </div>
    `).join("")
    : `<div class="empty">Новых записей нет</div>`;
}

function renderWorkOrders() {
  const role = activeCenter()?.employee_role || "owner";
  const canComplete = role === "owner";
  document.querySelector("#workOrdersList").innerHTML = state.workOrders.length
    ? state.workOrders.map((item) => `
      <div class="stack-item work-order-card">
        <div class="work-order-head">
          <div>
            <strong>${escapeHtml(item.work_order_number || `Заказ-наряд #${item.id}`)}</strong>
            <small>${item.visit_date} · авто #${item.vehicle_id} · ${item.odometer || "-"} км</small>
          </div>
          <span class="trust-badge">${statusLabel(item.status)}</span>
        </div>
        ${item.customer_complaint ? `<small>Жалоба: ${escapeHtml(item.customer_complaint)}</small>` : ""}
        ${item.diagnosis ? `<small>Диагностика: ${escapeHtml(item.diagnosis)}</small>` : ""}
        <div class="work-order-totals">
          <span>Работы: <strong>${money(item.labor_total || 0)}</strong></span>
          <span>Запчасти: <strong>${money(item.product_total || 0)}</strong></span>
          <span>Итого: <strong>${money(item.final_total || item.total_cost || 0)}</strong></span>
        </div>
        <form class="inline-work-form" data-labor-form="${item.id}">
          <input name="title" placeholder="Работа" required />
          <input name="quantity" type="number" min="0.001" step="0.001" value="1" aria-label="Количество" />
          <input name="unit_price" type="number" min="0" step="0.01" placeholder="Цена" required />
          <button type="submit">+ Работа</button>
        </form>
        <form class="inline-work-form" data-product-form="${item.id}">
          <input name="title" placeholder="Запчасть / материал" required />
          <input name="quantity" type="number" min="0.001" step="0.001" value="1" aria-label="Количество" />
          <input name="unit_price" type="number" min="0" step="0.01" placeholder="Цена" required />
          <button type="submit">+ Материал</button>
        </form>
        <div class="row-actions">
          ${["draft", "diagnosis", "approved_by_owner"].includes(item.status) ? `<button type="button" data-start-work-order="${item.id}">В работу</button>` : ""}
          ${role === "owner" ? `<button type="button" data-submit-work-order="${item.id}">На согласование</button>` : ""}
          ${canComplete ? `<button type="button" class="ghost-btn" data-complete-work-order="${item.id}">Завершить</button>` : ""}
        </div>
      </div>
    `).join("")
    : `<div class="empty">Активных заказ-нарядов нет</div>`;
}

function renderStaff() {
  const center = activeCenter();
  const panel = document.querySelector("#staffPanel");
  if (!center || center.employee_role !== "owner") {
    panel.classList.add("hidden");
    return;
  }
  panel.classList.remove("hidden");
  document.querySelector("#employeesList").innerHTML = state.employees.length
    ? state.employees.map((employee) => `
      <div class="stack-item">
        <strong>${escapeHtml(employee.first_name || employee.username || `Telegram ${employee.telegram_id || employee.user_id}`)}</strong>
        <small>${employee.telegram_id ? `Telegram ID: ${employee.telegram_id}` : `User #${employee.user_id}`}</small>
        <span class="trust-badge">${roleLabel(employee.role)} · ${statusLabel(employee.status)}</span>
        ${employee.invite_token ? `<small>Команда для сотрудника: /accept_sto_invite ${employee.invite_token}</small>` : ""}
        ${employee.role !== "owner" ? `<div class="row-actions">
          <button type="button" data-role-employee="${employee.id}" data-role="mechanic">Механик</button>
          <button type="button" data-role-employee="${employee.id}" data-role="receptionist">Администратор</button>
          <button type="button" class="ghost-btn" data-disable-employee="${employee.id}">Отключить</button>
        </div>` : ""}
      </div>
    `).join("")
    : `<div class="empty">Сотрудников пока нет</div>`;
}

async function runAction(button, callback) {
  if (button) button.disabled = true;
  try {
    await callback();
    toast("Готово");
    await loadWorkplace();
  } catch (error) {
    console.error(error);
    toast(error.message || "Ошибка", "error");
  } finally {
    if (button) button.disabled = false;
  }
}

document.querySelector("#centerSelect").addEventListener("change", async (event) => {
  state.activeCenterId = Number(event.currentTarget.value);
  await loadWorkplace();
});

document.querySelector("#refreshBtn").addEventListener("click", () => loadWorkplace());

document.querySelector("#inviteForm").addEventListener("submit", async (event) => {
  event.preventDefault();
  const form = event.currentTarget;
  const center = activeCenter();
  const data = formData(form);
  await runAction(form.querySelector('button[type="submit"]'), async () => {
    const employee = await api(`/service-centers/${center.id}/employees/invite`, {
      method: "POST",
      body: JSON.stringify({
        telegram_id: Number(data.telegram_id),
        role: data.role,
      }),
    });
    const result = document.querySelector("#inviteResult");
    result.classList.remove("hidden");
    result.textContent = `Передайте сотруднику команду: /accept_sto_invite ${employee.invite_token}`;
    form.reset();
  });
});

document.body.addEventListener("click", async (event) => {
  const button = event.target.closest("button");
  if (!button) return;
  const center = activeCenter();
  if (button.dataset.confirmAppointment) {
    await runAction(button, () => api(`/sto/appointments/${button.dataset.confirmAppointment}/confirm`, {
      method: "POST",
      body: JSON.stringify({ comment: "Подтверждено в панели СТО" }),
    }));
  }
  if (button.dataset.rejectAppointment) {
    await runAction(button, () => api(`/sto/appointments/${button.dataset.rejectAppointment}/reject`, {
      method: "POST",
      body: JSON.stringify({ comment: "Отклонено в панели СТО" }),
    }));
  }
  if (button.dataset.createWorkOrder) {
    const odometer = window.prompt("Пробег на приемке, км") || "";
    await runAction(button, () => api(`/sto/appointments/${button.dataset.createWorkOrder}/create-work-order`, {
      method: "POST",
      body: JSON.stringify({ odometer: numberOrNull(odometer), notes: "Создано в панели СТО" }),
    }));
  }
  if (button.dataset.startWorkOrder) {
    await runAction(button, () => api(`/work-orders/${button.dataset.startWorkOrder}/start`, {
      method: "POST",
      body: JSON.stringify({ comment: "Взято в работу" }),
    }));
  }
  if (button.dataset.submitWorkOrder) {
    await runAction(button, () => api(`/work-orders/${button.dataset.submitWorkOrder}/submit-approval`, {
      method: "POST",
      body: JSON.stringify({ comment: "Смета готова к согласованию" }),
    }));
  }
  if (button.dataset.completeWorkOrder) {
    await runAction(button, () => api(`/work-orders/${button.dataset.completeWorkOrder}/complete`, {
      method: "POST",
      body: JSON.stringify({ comment: "Работы завершены" }),
    }));
  }
  if (button.dataset.roleEmployee) {
    await runAction(button, () => api(`/service-centers/employees/${button.dataset.roleEmployee}`, {
      method: "PATCH",
      body: JSON.stringify({ role: button.dataset.role, status: "active" }),
    }));
  }
  if (button.dataset.disableEmployee) {
    await runAction(button, () => api(`/service-centers/employees/${button.dataset.disableEmployee}`, {
      method: "PATCH",
      body: JSON.stringify({ status: "inactive" }),
    }));
  }
});

document.body.addEventListener("submit", async (event) => {
  const form = event.target;
  if (form.matches("[data-labor-form]")) {
    event.preventDefault();
    const data = formData(form);
    await runAction(form.querySelector('button[type="submit"]'), () => api(`/work-orders/${form.dataset.laborForm}/labor-items`, {
      method: "POST",
      body: JSON.stringify({
        title: data.title,
        quantity: Number(data.quantity || 1),
        unit: "job",
        unit_price: Number(data.unit_price || 0),
        work_type: "repair",
      }),
    }));
  }
  if (form.matches("[data-product-form]")) {
    event.preventDefault();
    const data = formData(form);
    await runAction(form.querySelector('button[type="submit"]'), () => api(`/work-orders/${form.dataset.productForm}/product-items`, {
      method: "POST",
      body: JSON.stringify({
        title: data.title,
        quantity: Number(data.quantity || 1),
        unit: "pcs",
        unit_price: Number(data.unit_price || 0),
        product_type: "part",
      }),
    }));
  }
});

document.querySelector("#telegramRetryBtn").addEventListener("click", () => window.location.reload());

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