"use client";
import { useEffect, useState } from "react";
import { RefreshCw } from "lucide-react";

interface CurrentWeather {
  temp: number; feelsLike: number; humidity: number; windKmh: number; desc: string; icon: string;
}
interface DayForecast {
  date: string; maxTemp: number; minTemp: number; desc: string; icon: string; precipProb: number;
}
interface WeatherData {
  current: CurrentWeather;
  forecast: DayForecast[];
}

const DAY_NAMES = ["Вс","Пн","Вт","Ср","Чт","Пт","Сб"];

export function WeatherWidget() {
  const [data, setData] = useState<WeatherData | null>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState(false);
  const [selected, setSelected] = useState(0);

  const fetch_ = async () => {
    setLoading(true); setError(false);
    try {
      const res = await fetch("/api/weather");
      if (!res.ok) throw new Error();
      setData(await res.json());
    } catch { setError(true); }
    finally { setLoading(false); }
  };

  useEffect(() => { fetch_(); }, []);

  return (
    <div className="card card-blue relative overflow-hidden">
      <div className="absolute inset-0 bg-gradient-to-br from-blue-950/40 via-transparent to-indigo-950/30 pointer-events-none" />
      <div className="absolute top-0 right-0 w-64 h-64 bg-blue-500/5 rounded-full -translate-y-1/2 translate-x-1/2 pointer-events-none" />

      <div className="relative p-6">
        {loading ? (
          <div className="animate-pulse space-y-4">
            <div className="flex items-end gap-4">
              <div className="h-20 w-20 bg-white/5 rounded-2xl" />
              <div className="space-y-2">
                <div className="h-12 w-28 bg-white/5 rounded-lg" />
                <div className="h-4 w-40 bg-white/5 rounded" />
              </div>
            </div>
            <div className="flex gap-2">{[...Array(7)].map((_,i) => <div key={i} className="flex-1 h-24 bg-white/5 rounded-2xl" />)}</div>
          </div>
        ) : error ? (
          <div className="text-slate-500 text-sm py-8 text-center">Нет данных о погоде</div>
        ) : data && (
          <div className="space-y-5">
            {/* Current */}
            <div className="flex items-start justify-between">
              <div>
                <p className="text-slate-400 text-xs font-medium uppercase tracking-wider mb-2">Санкт-Петербург</p>
                <div className="flex items-start gap-3">
                  <span className="text-6xl font-extralight text-white leading-none">
                    {selected === 0 ? data.current.temp : data.forecast[selected].maxTemp}°
                  </span>
                  <div className="mt-1">
                    <span className="text-3xl">{selected === 0 ? data.current.icon : data.forecast[selected].icon}</span>
                  </div>
                </div>
                <p className="text-slate-300 text-sm mt-2">{selected === 0 ? data.current.desc : data.forecast[selected].desc}</p>
                {selected !== 0 && (
                  <p className="text-slate-500 text-xs mt-1">мин {data.forecast[selected].minTemp}°</p>
                )}
              </div>
              {selected === 0 && (
                <div className="flex flex-col gap-2 text-xs text-slate-400">
                  <div className="flex items-center gap-1.5 bg-white/5 rounded-lg px-2.5 py-1.5">
                    <span>🌡️</span>
                    <span>Ощущ. {data.current.feelsLike}°</span>
                  </div>
                  <div className="flex items-center gap-1.5 bg-white/5 rounded-lg px-2.5 py-1.5">
                    <span>💧</span>
                    <span>{data.current.humidity}%</span>
                  </div>
                  <div className="flex items-center gap-1.5 bg-white/5 rounded-lg px-2.5 py-1.5">
                    <span>💨</span>
                    <span>{data.current.windKmh} км/ч</span>
                  </div>
                  <button onClick={fetch_} className="flex items-center gap-1.5 bg-white/5 hover:bg-white/10 rounded-lg px-2.5 py-1.5 transition-colors">
                    <RefreshCw className={`w-3 h-3 ${loading ? "animate-spin" : ""}`} />
                    <span>Обновить</span>
                  </button>
                </div>
              )}
            </div>

            {/* 7-day forecast */}
            <div className="grid grid-cols-7 gap-1.5">
              {data.forecast.map((day: DayForecast, i: number) => {
                const d = new Date(day.date + "T12:00:00");
                return (
                  <button
                    key={day.date}
                    onClick={() => setSelected(i)}
                    className={`flex flex-col items-center gap-1.5 py-3 px-1 rounded-2xl transition-all ${
                      selected === i
                        ? "bg-white/10 ring-1 ring-white/20 shadow-lg"
                        : "hover:bg-white/5"
                    }`}
                  >
                    <span className="text-[10px] font-medium text-slate-400">{i === 0 ? "Сег" : DAY_NAMES[d.getDay()]}</span>
                    <span className="text-xl">{day.icon}</span>
                    <span className="text-xs font-semibold text-white">{day.maxTemp}°</span>
                    <span className="text-[10px] text-slate-600">{day.minTemp}°</span>
                    {day.precipProb > 20 && (
                      <span className="text-[9px] text-blue-400 font-medium">{day.precipProb}%</span>
                    )}
                  </button>
                );
              })}
            </div>
          </div>
        )}
      </div>
    </div>
  );
}