const page = CarPassPage;

const state = {
  cars: [],
  catalog: [],
  selectedCarId: null,
};

const params = new URLSearchParams(window.location.search);

function selectedCar() {
  return state.cars.find((item) => item.id === state.selectedCarId) || null;
}

function ensureOption(select, value) {
  if (!value) return;
  if (![...select.options].some((option) => option.value === value)) {
    select.insertAdjacentHTML("beforeend", `<option value="${page.escapeHtml(value)}">${page.escapeHtml(value)}</option>`);
  }
}

function selectedModel() {
  const makeName = document.querySelector("#makeSelect").value;
  const modelName = document.querySelector("#modelSelect").value;
  const make = state.catalog.find((item) => item.name === makeName);
  return make?.models?.find((item) => item.name === modelName) || null;
}

function syncModels(modelValue = "", trimValue = "") {
  const makeName = document.querySelector("#makeSelect").value;
  const modelSelect = document.querySelector("#modelSelect");
  const models = state.catalog.find((item) => item.name === makeName)?.models || [];
  modelSelect.disabled = !models.length;
  modelSelect.innerHTML = models.length
    ? `<option value="">Модель</option>` + models.map((model) => `<option value="${page.escapeHtml(model.name)}">${page.escapeHtml(model.name)}</option>`).join("")
    : `<option value="">Сначала марка</option>`;
  ensureOption(modelSelect, modelValue);
  modelSelect.value = modelValue || "";
  syncTrims(trimValue);
}

function syncTrims(trimValue = "") {
  const trimSelect = document.querySelector("#trimSelect");
  const trims = selectedModel()?.trims || [];
  trimSelect.disabled = !trims.length;
  trimSelect.innerHTML = trims.length
    ? `<option value="">Комплектация</option>` + trims.map((trim) => `<option value="${page.escapeHtml(trim.name)}">${page.escapeHtml(trim.name)}</option>`).join("")
    : `<option value="">Сначала модель</option>`;
  ensureOption(trimSelect, trimValue);
  trimSelect.value = trimValue || "";
  const trim = trims.find((item) => item.name === trimSelect.value);
  const fuel = document.querySelector('[name="fuel_type"]');
  if (trim?.fuel_type && !fuel.value) fuel.value = trim.fuel_type;
  if (trim?.body_type && !document.querySelector('[name="body_type"]')?.value) {
    const bodyInput = document.querySelector('[name="body_type"]');
    if (bodyInput) bodyInput.value = trim.body_type;
  }
}

async function loadCatalog() {
  state.catalog = await page.api("/catalog/makes");
  const makeSelect = document.querySelector("#makeSelect");
  const makes = [...state.catalog].sort((a, b) => a.name.localeCompare(b.name, "ru"));
  makeSelect.innerHTML = `<option value="">Марка</option>` + makes
    .map((make) => `<option value="${page.escapeHtml(make.name)}">${page.escapeHtml(make.name)}</option>`)
    .join("");
  makeSelect.addEventListener("change", () => syncModels());
  document.querySelector("#modelSelect").addEventListener("change", () => syncTrims());
  document.querySelector("#trimSelect").addEventListener("change", () => syncTrims(document.querySelector("#trimSelect").value));
}

async function loadCars() {
  state.cars = await page.api(`/cars?owner_id=${page.state.user.id}`);
  const routeCarId = Number(params.get("car_id") || 0);
  if (params.get("action") === "new") state.selectedCarId = null;
  else if (routeCarId && state.cars.some((item) => item.id === routeCarId)) state.selectedCarId = routeCarId;
  else if (!state.selectedCarId && state.cars.length) state.selectedCarId = state.cars[0].id;
  renderVehicles();
  fillForm();
}

function renderVehicles() {
  const root = document.querySelector("#vehicleList");
  root.innerHTML = state.cars.length
    ? state.cars.map((car) => `
      <button type="button" class="service-list-card ${car.id === state.selectedCarId ? "active" : ""}" data-vehicle="${car.id}">
        <strong>${page.escapeHtml(car.name)}</strong>
        <small>${page.escapeHtml([car.make, car.model, car.year, car.license_plate_display].filter(Boolean).join(" · ") || "Паспорт без деталей")}</small>
      </button>
    `).join("")
    : `<div class="empty">Автомобилей пока нет. Заполните форму справа.</div>`;
  root.querySelectorAll("[data-vehicle]").forEach((button) => {
    button.addEventListener("click", () => {
      state.selectedCarId = Number(button.dataset.vehicle);
      renderVehicles();
      fillForm();
    });
  });
}

function setValue(form, name, value) {
  const input = form.elements[name];
  if (!input) return;
  input.value = value ?? "";
}

function fillForm() {
  const form = document.querySelector("#vehicleProfileForm");
  const car = selectedCar();
  form.reset();
  document.querySelector("#deleteVehicleBtn").classList.toggle("hidden", !car);
  document.querySelector("#pageTitle").textContent = car ? car.name : "Новый автомобиль";
  document.querySelector("#pageHint").textContent = car
    ? [car.make, car.model, car.year, car.license_plate_display].filter(Boolean).join(" · ") || "Заполните недостающие данные паспорта."
    : "Создайте карточку, а потом дополняйте ее по мере обслуживания.";
  if (!car) {
    syncModels();
    return;
  }
  [
    "name",
    "year",
    "plate_number",
    "vin",
    "current_odometer",
    "fuel_type",
    "engine_volume_l",
    "transmission",
    "drive_type",
    "engine_oil_type",
    "engine_oil_volume_l",
    "transmission_fluid_type",
    "transmission_fluid_volume_l",
    "coolant_type",
    "brake_fluid_type",
    "tire_size",
    "oil_change_interval_km",
    "purchase_price",
    "purchase_date",
    "purchase_type",
    "notes",
  ].forEach((name) => setValue(form, name, car[name]));
  ensureOption(form.elements.make, car.make);
  form.elements.make.value = car.make || "";
  syncModels(car.model || "", car.trim || "");
}

function payloadFromForm(form) {
  const data = page.formData(form);
  return {
    name: data.name,
    make: data.make || null,
    model: data.model || null,
    trim: data.trim || null,
    year: page.numberOrNull(data.year),
    plate_number: data.plate_number || null,
    vin: data.vin || null,
    current_odometer: page.numberOrNull(data.current_odometer),
    fuel_type: data.fuel_type || null,
    engine_volume_l: page.numberOrNull(data.engine_volume_l),
    transmission: data.transmission || null,
    drive_type: data.drive_type || null,
    engine_oil_type: data.engine_oil_type || null,
    engine_oil_volume_l: page.numberOrNull(data.engine_oil_volume_l),
    transmission_fluid_type: data.transmission_fluid_type || null,
    transmission_fluid_volume_l: page.numberOrNull(data.transmission_fluid_volume_l),
    coolant_type: data.coolant_type || null,
    brake_fluid_type: data.brake_fluid_type || null,
    tire_size: data.tire_size || null,
    oil_change_interval_km: page.numberOrNull(data.oil_change_interval_km),
    purchase_price: page.numberOrNull(data.purchase_price),
    purchase_date: data.purchase_date || null,
    purchase_type: data.purchase_type || "unknown",
    purchase_currency: page.state.user?.currency || "RUB",
    currency: page.state.user?.currency || "RUB",
    notes: data.notes || null,
  };
}

document.querySelector("#newVehicleBtn").addEventListener("click", () => {
  state.selectedCarId = null;
  renderVehicles();
  fillForm();
});

document.querySelector("#vehicleProfileForm").addEventListener("submit", async (event) => {
  event.preventDefault();
  const form = event.currentTarget;
  const car = selectedCar();
  await page.runAction(document.querySelector("#saveVehicleBtn"), "Сохраняю паспорт...", async () => {
    const saved = await page.api(car ? `/cars/${car.id}` : "/cars", {
      method: car ? "PATCH" : "POST",
      body: JSON.stringify(payloadFromForm(form)),
    });
    state.selectedCarId = saved.id;
    await loadCars();
    page.toast("Паспорт сохранен");
  });
});

document.querySelector("#deleteVehicleBtn").addEventListener("click", async (event) => {
  const car = selectedCar();
  if (!car || !window.confirm(`Удалить автомобиль «${car.name}» и все его записи?`)) return;
  await page.runAction(event.currentTarget, "Удаляю автомобиль...", async () => {
    await page.api(`/cars/${car.id}`, { method: "DELETE" });
    state.selectedCarId = null;
    await loadCars();
    page.toast("Автомобиль удален");
  });
});

page.boot(async () => {
  await loadCatalog();
  await loadCars();
});