"use client";

import React, { useState, useEffect } from "react";
import { useRouter } from "next/navigation";
import { FaBell, FaUser } from "react-icons/fa";
import TabBar from "../components/TabBar";

const API_BASE = process.env.NEXT_PUBLIC_API_BASE_URL;

const CreateRequestPage = () => {
  const router = useRouter();

  const [title, setTitle] = useState("");
  const [date, setDate] = useState(""); // desired_completion_date
  const [time, setTime] = useState("");
  const [description, setDescription] = useState("");
  const [note, setNote] = useState(""); // contact_notes

  const [address, setAddress] = useState("");
  const [city, setCity] = useState("");
  const [phone, setPhone] = useState("");
  const [urgency, setUrgency] = useState("medium");
  const [latitude, setLatitude] = useState("");
  const [longitude, setLongitude] = useState("");
  const [geoError, setGeoError] = useState("");

  const [error, setError] = useState("");
  const [isSubmitting, setIsSubmitting] = useState(false);

  const [userName, setUserName] = useState("Пользователь");
  const [profileError, setProfileError] = useState("");

  const isFormValid =
    title &&
    date &&
    time &&
    description &&
    address &&
    city &&
    urgency &&
    latitude &&
    longitude;

  const getAccessToken = () => {
    if (typeof window === "undefined") return null;
    const saved = localStorage.getItem("authUser");
    const authUser = saved ? JSON.parse(saved) : null;
    return authUser?.accessToken || null;
  };

  // профиль + автоподстановка адреса/города/телефона
  useEffect(() => {
    const fetchProfile = async () => {
      if (!API_BASE) return;

      const accessToken = getAccessToken();
      if (!accessToken) return;

      try {
        const res = await fetch(`${API_BASE}/users/me`, {
          headers: {
            Accept: "application/json",
            Authorization: `Bearer ${accessToken}`,
          },
        });

        if (!res.ok) {
          setProfileError("Не удалось загрузить профиль");
          return;
        }

        const data = await res.json(); // UserProfile
        const fullName =
          [data.first_name, data.last_name].filter(Boolean).join(" ").trim() ||
          data.email;
        setUserName(fullName);

        // подставляем только если поля ещё пустые, чтобы не перетирать ручной ввод
        if (!address && data.address) {
          setAddress(data.address);
        }
        if (!city && data.city) {
          setCity(data.city);
        }
        if (!phone && data.phone) {
          setPhone(data.phone);
        }
      } catch (e) {
        setProfileError("Ошибка загрузки профиля");
      }
    };

    fetchProfile();
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []); // однократно при монтировании

  // геолокация
  useEffect(() => {
    if (typeof navigator === "undefined" || !("geolocation" in navigator)) {
      setGeoError("Геолокация не поддерживается браузером");
      return;
    }

    navigator.geolocation.getCurrentPosition(
      (pos) => {
        const { latitude: lat, longitude: lon } = pos.coords;
        setLatitude(lat.toFixed(6));
        setLongitude(lon.toFixed(6));
        setGeoError("");
      },
      (err) => {
        console.error("Geolocation error:", err);
        setGeoError("Не удалось получить геолокацию, введите координаты вручную");
      },
      {
        enableHighAccuracy: true,
        timeout: 10000,
        maximumAge: 60000,
      }
    );
  }, []);

  const handleSubmit = async (e) => {
    e.preventDefault();
    if (!isFormValid || !API_BASE) return;

    try {
      setError("");
      setIsSubmitting(true);

      const accessToken = getAccessToken();
      if (!accessToken) {
        setError("Вы не авторизованы");
        setIsSubmitting(false);
        return;
      }

      const desiredDateTime = new Date(`${date}T${time}:00`);
      const desired_completion_date = desiredDateTime.toISOString();

      const body = {
        request_type_id: 1, // TODO: вынести в селект типов
        title,
        description,
        latitude: Number(latitude),
        longitude: Number(longitude),
        address,
        city,
        desired_completion_date,
        urgency, // low | medium | high | urgent
        contact_phone: phone || null,
        contact_notes: note || null,
      };

      const res = await fetch(`${API_BASE}/requests`, {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
          Accept: "application/json",
          Authorization: `Bearer ${accessToken}`,
        },
        body: JSON.stringify(body),
      });

      if (!res.ok) {
        let msg = "Ошибка при создании заявки";
        try {
          const data = await res.json();
          if (data.error) msg = data.error;
        } catch {
          const text = await res.text();
          if (text) msg = text;
        }
        setError(msg);
        setIsSubmitting(false);
        return;
      }

      const created = await res.json();
      console.log("Заявка создана:", created);

      router.push("/home");
    } catch (err) {
      setError(err.message || "Ошибка сети");
      setIsSubmitting(false);
    }
  };

  return (
    <div className="min-h-screen w-full bg-[#90D2F9] flex justify-center px-4">
      <div className="relative w-full max-w-md flex flex-col pb-20 pt-4">
        {/* Header */}
        <header className="flex items-center justify-between mb-4">
          <div className="flex items-center gap-2">
            <div className="w-8 h-8 rounded-full border border-white flex items-center justify-center">
              <FaUser className="text-white text-sm" />
            </div>
            <div>
              <p className="font-montserrat font-extrabold text-[20px] leading-[11px] text-white">
                {userName}
              </p>
              {profileError && (
                <p className="text-[10px] text-red-200 font-montserrat mt-1">
                  {profileError}
                </p>
              )}
            </div>
          </div>
          <button
            type="button"
            className="w-8 h-8 rounded-full border border-white flex items-center justify-center"
          >
            <FaBell className="text-white text-sm" />
          </button>
        </header>

        <h1 className="font-montserrat font-extrabold text-[20px] leading-[22px] text-white mb-3">
          Создать заявку
        </h1>

        {/* Ошибка */}
        {error && (
          <div className="mb-2 bg-red-500 text-white text-xs font-montserrat px-3 py-2 rounded-lg">
            {error}
          </div>
        )}

        {/* Карточка с формой */}
        <main className="bg-white rounded-xl p-4 flex flex-col gap-3">
          <form onSubmit={handleSubmit} className="flex flex-col">
            {/* Что сделать */}
            <div className="flex flex-col gap-1">
              <label className="font-montserrat font-bold text-[10px] text-white/90">
                Что сделать
              </label>
              <input
                type="text"
                value={title}
                onChange={(e) => setTitle(e.target.value)}
                className="w-full bg-[#72B8E2] rounded-lg px-3 py-3 text-sm font-montserrat text-white placeholder:text-white/70 outline-none focus:ring-2 focus:ring-blue-200"
                placeholder="Опишите основную задачу"
              />
            </div>

            {/* Адрес */}
            <div className="flex flex-col gap-1 mt-2">
              <label className="font-montserrat font-bold text-[10px] text-white/90">
                Адрес
              </label>
              <input
                type="text"
                value={address}
                onChange={(e) => setAddress(e.target.value)}
                className="w-full bg-[#72B8E2] rounded-lg px-3 py-3 text-sm font-montserrat text-white placeholder:text-white/70 outline-none focus:ring-2 focus:ring-blue-200"
                placeholder="ул. Ленина, д. 10, кв. 5"
              />
            </div>

            {/* Город */}
            <div className="flex flex-col gap-1">
              <label className="font-montserrat font-bold text-[10px] text-white/90">
                Город
              </label>
              <input
                type="text"
                value={city}
                onChange={(e) => setCity(e.target.value)}
                className="w-full bg-[#72B8E2] rounded-lg px-3 py-3 text-sm font-montserrat text-white placeholder:text-white/70 outline-none focus:ring-2 focus:ring-blue-200"
                placeholder="Например: Пермь"
              />
            </div>

            {/* Координаты */}
            <div className="flex gap-3">
              <div className="flex-1 flex flex-col gap-1">
                <label className="font-montserrat font-bold text-[10px] text-white/90">
                  Широта (lat)
                </label>
                <input
                  type="number"
                  step="0.000001"
                  value={latitude}
                  onChange={(e) => setLatitude(e.target.value)}
                  className="w-full bg-[#72B8E2] rounded-lg px-3 py-3 text-sm font-montserrat text-white placeholder:text-white/70 outline-none focus:ring-2 focus:ring-blue-200"
                  placeholder="55.751244"
                />
              </div>
              <div className="flex-1 flex flex-col gap-1">
                <label className="font-montserrat font-bold text-[10px] text-white/90">
                  Долгота (lon)
                </label>
                <input
                  type="number"
                  step="0.000001"
                  value={longitude}
                  onChange={(e) => setLongitude(e.target.value)}
                  className="w-full bg-[#72B8E2] rounded-lg px-3 py-3 text-sm font-montserrat text-white placeholder:text-white/70 outline-none focus:ring-2 focus:ring-blue-200"
                  placeholder="37.618423"
                />
              </div>
            </div>

            {geoError && (
              <p className="mt-1 text-[10px] text-yellow-200 font-montserrat">
                {geoError}
              </p>
            )}

            {/* Дата и Время */}
            <div className="flex gap-3 mt-2">
              <div className="flex-1 flex flex-col gap-1">
                <label className="font-montserrat font-bold text-[10px] text-white/90">
                  Дата
                </label>
                <input
                  type="date"
                  value={date}
                  onChange={(e) => setDate(e.target.value)}
                  className="w-full bg-[#72B8E2] rounded-lg px-3 py-3 text-sm font-montserrat text-white outline-none focus:ring-2 focus:ring-blue-200"
                />
              </div>
              <div className="flex-1 flex flex-col gap-1">
                <label className="font-montserrat font-bold text-[10px] text-white/90">
                  Время
                </label>
                <input
                  type="time"
                  value={time}
                  onChange={(e) => setTime(e.target.value)}
                  className="w-full bg-[#72B8E2] rounded-lg px-3 py-3 text-sm font-montserrat text-white outline-none focus:ring-2 focus:ring-blue-200"
                />
              </div>
            </div>

            {/* Срочность */}
            <div className="flex flex-col gap-1 mt-2">
              <label className="font-montserrat font-bold text-[10px] text-white/90">
                Срочность
              </label>
              <select
                value={urgency}
                onChange={(e) => setUrgency(e.target.value)}
                className="w-full bg-[#72B8E2] rounded-lg px-3 py-3 text-sm font-montserrat text-white outline-none focus:ring-2 focus:ring-blue-200"
              >
                <option value="low">Низкая</option>
                <option value="medium">Средняя</option>
                <option value="high">Высокая</option>
                <option value="urgent">Срочно</option>
              </select>
            </div>

            {/* Телефон для связи */}
            <div className="flex flex-col gap-1 mt-2">
              <label className="font-montserrat font-bold text-[10px] text-white/90">
                Телефон для связи
              </label>
              <input
                type="tel"
                value={phone}
                onChange={(e) => setPhone(e.target.value)}
                className="w-full bg-[#72B8E2] rounded-lg px-3 py-3 text-sm font-montserrat text-white placeholder:text-white/70 outline-none focus:ring-2 focus:ring-blue-200"
                placeholder="+7 900 000 00 00"
              />
            </div>

            {/* Описание */}
            <div className="flex flex-col gap-1 mt-2">
              <label className="font-montserrat font-bold text-[10px] text-white">
                Описание
              </label>
              <textarea
                value={description}
                onChange={(e) => setDescription(e.target.value)}
                rows={3}
                className="w-full bg-[#72B8E2] rounded-lg px-3 py-3 text-sm font-montserrat text-white placeholder:text-white/70 outline-none focus:ring-2 focus:ring-blue-200 resize-none"
                placeholder="Подробно опишите, что нужно сделать"
              />
            </div>

            {/* Дополнительно */}
            <div className="flex flex-col gap-1 mt-2">
              <label className="font-montserrat font-bold text-[10px] text-white/90">
                Дополнительно
              </label>
              <textarea
                value={note}
                onChange={(e) => setNote(e.target.value)}
                rows={2}
                className="w-full bg-[#72B8E2] rounded-lg px-3 py-3 text-sm font-montserrat text-white placeholder:text-white/70 outline-none focus:ring-2 focus:ring-blue-200 resize-none"
                placeholder="Комментарий (необязательно)"
              />
            </div>

            {/* Кнопка Отправить */}
            <button
              type="submit"
              disabled={!isFormValid || isSubmitting}
              className={`mt-5 w-full rounded-lg py-3 text-center font-montserrat font-bold text-sm transition-colors ${
                isFormValid && !isSubmitting
                  ? "bg-[#94E067] text-white hover:bg-green-600"
                  : "bg-[#94E067]/60 text-white/70 cursor-not-allowed"
              }`}
            >
              {isSubmitting ? "Отправка..." : "Отправить"}
            </button>
          </form>
        </main>

        <TabBar />
      </div>
    </div>
  );
};

export default CreateRequestPage;