"use client";

import React, { useState } from 'react';
import { useForm } from 'react-hook-form';
import { zodResolver } from '@hookform/resolvers/zod';
import { z } from 'zod';
import { Loader2, CheckCircle2, AlertCircle, Check } from 'lucide-react';
import { submitContactForm } from '@/app/kontakt/actions';
import { getRecaptchaToken } from '@/lib/getRecaptchaToken';

const contactFormSchema = z.object({
  name: z.string().min(2, "Imię musi mieć min. 2 znaki"),
  phone: z.string().min(9, "Wprowadź poprawny numer telefonu"),
  email: z.union([z.literal(''), z.string().email("Niepoprawny adres e-mail")]).optional(),
  city: z.string().min(1, "Wybierz miasto"),
  subject: z.string().optional(),
  message: z.string().optional(),
  brand: z.string().optional(),
  age: z.string().optional(),
});

type ContactFormValues = z.infer<typeof contactFormSchema>;

export function ContactForm() {
  const [serverState, setServerState] = useState<{ success?: boolean; message?: string } | null>(null);
  const [consent, setConsent] = useState(false);
  const [files, setFiles] = useState<File[]>([]);

  const {
    register,
    handleSubmit: hookFormSubmit,
    formState: { errors, isSubmitting },
    reset,
    watch
  } = useForm<ContactFormValues>({
    resolver: zodResolver(contactFormSchema),
    defaultValues: {
      name: '',
      phone: '',
      email: '',
      city: '',
      subject: '',
      message: '',
      brand: '',
      age: '',
    }
  });

  const onSubmit = async (data: ContactFormValues) => {
    setServerState(null);
    
    const formData = new FormData();
    Object.entries(data).forEach(([key, value]) => {
      if (value !== undefined) formData.append(key, value.toString());
    });
    formData.append("consent", consent ? 'true' : 'false');

    const token = await getRecaptchaToken('submit');
    if (token) {
      formData.append('recaptchaToken', token);
    }

    const response = await submitContactForm(null, formData);
    
    setServerState({
      success: response.success,
      message: response.message
    });

    if (response.success) {
      reset();
      setConsent(false);
    }
  };

  const handleSubmit = (e: React.FormEvent<HTMLFormElement>) => {
    if (!consent) {
      e.preventDefault();
      alert('Proszę zaznaczyć zgodę na przetwarzanie danych.');
      return;
    }
    hookFormSubmit(onSubmit)(e);
  };

  if (serverState?.success) {
    return (
      <div className="bg-green-50 text-green-800 p-8 rounded-2xl border border-green-200 flex flex-col items-center text-center">
        <CheckCircle2 className="w-16 h-16 text-green-500 mb-4" />
        <h3 className="text-2xl font-bold font-heading mb-2">Wiadomość wysłana!</h3>
        <p className="text-green-700">{serverState.message}</p>
        <button 
          onClick={() => setServerState(null)}
          className="mt-6 px-6 py-2 bg-green-600 text-white rounded-lg font-semibold hover:bg-green-700 transition-colors"
        >
          Wyślij kolejną wiadomość
        </button>
      </div>
    );
  }

  return (
    <form onSubmit={handleSubmit} className="space-y-6 bg-white p-6 md:p-8 rounded-2xl border border-border shadow-sm">
      {serverState && !serverState.success && (
        <div className="bg-red-50 text-red-800 p-4 rounded-xl border border-red-200 flex items-start gap-3">
          <AlertCircle className="w-5 h-5 shrink-0 mt-0.5" />
          <p className="text-sm font-medium">{serverState.message}</p>
        </div>
      )}

      <div className="grid grid-cols-1 sm:grid-cols-2 gap-6">
        {/* Imię */}
        <div className="space-y-2">
          <label htmlFor="name" className="text-sm font-semibold text-primary">Imię i nazwisko <span className="text-red-500">*</span></label>
          <input
            {...register("name")}
            id="name"
            required
            className={`w-full px-4 py-3 rounded-xl border ${errors.name ? 'border-red-500 focus:ring-red-500' : 'border-border focus:border-primary focus:ring-primary/20'} outline-none focus:ring-2 transition-all bg-slate-50`}
            placeholder="Jan Kowalski"
            aria-invalid={errors.name ? "true" : "false"}
          />
          {errors.name && <p className="text-red-500 text-xs font-medium">{errors.name.message}</p>}
        </div>

        {/* Telefon */}
        <div className="space-y-2">
          <label htmlFor="phone" className="text-sm font-semibold text-primary">Telefon <span className="text-red-500">*</span></label>
          <input
            {...register("phone")}
            id="phone"
            type="tel"
            required
            className={`w-full px-4 py-3 rounded-xl border ${errors.phone ? 'border-red-500 focus:ring-red-500' : 'border-border focus:border-primary focus:ring-primary/20'} outline-none focus:ring-2 transition-all bg-slate-50`}
            placeholder="+48 123 456 789"
          />
          {errors.phone && <p className="text-red-500 text-xs font-medium">{errors.phone.message}</p>}
        </div>
      </div>

      <div className="grid grid-cols-1 sm:grid-cols-2 gap-6">
        {/* Email */}
        <div className="space-y-2">
          <label htmlFor="email" className="text-sm font-semibold text-primary">Adres e-mail</label>
          <input
            {...register("email")}
            id="email"
            type="email"
            className={`w-full px-4 py-3 rounded-xl border ${errors.email ? 'border-red-500 focus:ring-red-500' : 'border-border focus:border-primary focus:ring-primary/20'} outline-none focus:ring-2 transition-all bg-slate-50`}
            placeholder="jan@example.com"
          />
          {errors.email && <p className="text-red-500 text-xs font-medium">{errors.email.message}</p>}
        </div>

        {/* Miasto */}
        <div className="space-y-2">
          <label htmlFor="city" className="text-sm font-semibold text-primary">Miasto <span className="text-red-500">*</span></label>
          <select
            {...register("city")}
            id="city"
            required
            className={`w-full px-4 py-3 rounded-xl border ${errors.city ? 'border-red-500 focus:ring-red-500' : 'border-border focus:border-primary focus:ring-primary/20'} outline-none focus:ring-2 transition-all bg-slate-50 appearance-none`}
          >
            <option value="">Wybierz miasto...</option>
            <option value="Wrocław">Wrocław</option>
            <option value="Legnica">Legnica</option>
            <option value="Wałbrzych">Wałbrzych</option>
            <option value="Jelenia Góra">Jelenia Góra</option>
            <option value="Lubin">Lubin</option>
            <option value="Głogów">Głogów</option>
            <option value="Świdnica">Świdnica</option>
            <option value="Dzierżoniów">Dzierżoniów</option>
            <option value="Oleśnica">Oleśnica</option>
            <option value="Oława">Oława</option>
            <option value="Trzebnica">Trzebnica</option>
            <option value="Środa Śląska">Środa Śląska</option>
            <option value="Inne">Inne miasto</option>
          </select>
          {errors.city && <p className="text-red-500 text-xs font-medium">{errors.city.message}</p>}
        </div>
      </div>

      {/* Temat */}
      <div className="space-y-2">
        <label htmlFor="subject" className="text-sm font-semibold text-primary">Temat rozmowy</label>
        <select
          {...register("subject")}
          id="subject"
          className={`w-full px-4 py-3 rounded-xl border ${errors.subject ? 'border-red-500 focus:ring-red-500' : 'border-border focus:border-primary focus:ring-primary/20'} outline-none focus:ring-2 transition-all bg-slate-50 appearance-none`}
        >
          <option value="">Wybierz temat...</option>
          <option value="klimatyzacja">Klimatyzacja</option>
          <option value="pompy-ciepla">Pompy ciepła</option>
          <option value="serwis">Serwis</option>
          <option value="inne">Inne zapytanie</option>
        </select>
        {errors.subject && <p className="text-red-500 text-xs font-medium">{errors.subject.message}</p>}
      </div>

      {/* Warunkowe pola dla serwisu */}
      {watch('subject') === 'serwis' && (
        <div className="grid grid-cols-1 sm:grid-cols-2 gap-6">
          <div className="space-y-2">
            <label htmlFor="brand" className="text-sm font-semibold text-primary">Marka klimatyzatora</label>
            <select
              {...register("brand")}
              id="brand"
              className={`w-full px-4 py-3 rounded-xl border ${errors.brand ? 'border-red-500 focus:ring-red-500' : 'border-border focus:border-primary focus:ring-primary/20'} outline-none focus:ring-2 transition-all bg-slate-50 appearance-none`}
            >
              <option value="">Wybierz markę...</option>
              <option value="Daikin">Daikin</option>
              <option value="Mitsubishi">Mitsubishi</option>
              <option value="LG">LG</option>
              <option value="Samsung">Samsung</option>
              <option value="Gree">Gree</option>
              <option value="Rotenso">Rotenso</option>
              <option value="Haier">Haier</option>
              <option value="Aux">Aux</option>
              <option value="Fuji Electric">Fuji Electric</option>
              <option value="Toshiba">Toshiba</option>
              <option value="Inna">Inna / Nie wiem</option>
            </select>
          </div>
          <div className="space-y-2">
            <label htmlFor="age" className="text-sm font-semibold text-primary">Wiek urządzenia</label>
            <select
              {...register("age")}
              id="age"
              className={`w-full px-4 py-3 rounded-xl border ${errors.age ? 'border-red-500 focus:ring-red-500' : 'border-border focus:border-primary focus:ring-primary/20'} outline-none focus:ring-2 transition-all bg-slate-50 appearance-none`}
            >
              <option value="">Jak długo masz klimatyzator?</option>
              <option value="Mniej niż rok">Mniej niż rok (na gwarancji)</option>
              <option value="1-3 lata">1 - 3 lata</option>
              <option value="Ponad 3 lata">Ponad 3 lata</option>
              <option value="Nie wiem">Nie wiem</option>
            </select>
          </div>
        </div>
      )}

      {/* Wiadomość */}
      <div className="space-y-2">
        <label htmlFor="message" className="text-sm font-semibold text-primary">Wiadomość</label>
        <textarea
          {...register("message")}
          id="message"
          rows={5}
          className={`w-full px-4 py-3 rounded-xl border ${errors.message ? 'border-red-500 focus:ring-red-500' : 'border-border focus:border-primary focus:ring-primary/20'} outline-none focus:ring-2 transition-all bg-slate-50 resize-y`}
          placeholder="Opisz krótko, w czym możemy Ci pomóc..."
        />
        {errors.message && <p className="text-red-500 text-xs font-medium">{errors.message.message}</p>}
      </div>

      {/* Załączniki */}
      <div className="flex flex-col gap-1.5">
        <label className="text-sm font-medium text-primary">
          Załącz zdjęcia <span className="text-text-muted font-normal">(opcjonalnie)</span>
        </label>
        <label className="flex flex-col items-center justify-center gap-2 border-2 border-dashed border-border rounded-xl p-6 cursor-pointer hover:border-accent hover:bg-accent/5 transition-colors">
          <input
            type="file"
            multiple
            accept="image/*,.pdf"
            className="sr-only"
            onChange={(e) => setFiles(Array.from(e.target.files || []))}
          />
          <svg xmlns="http://www.w3.org/2000/svg" className="size-8 text-text-muted" fill="none" viewBox="0 0 24 24" stroke="currentColor">
            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M4 16l4.586-4.586a2 2 0 012.828 0L16 16m-2-2l1.586-1.586a2 2 0 012.828 0L20 14m-6-6h.01M6 20h12a2 2 0 002-2V6a2 2 0 00-2-2H6a2 2 0 00-2 2v12a2 2 0 00-2 2z" />
          </svg>
          <span className="text-sm text-text-muted text-center">
            Kliknij aby wybrać zdjęcia lub przeciągnij tutaj<br />
            <span className="text-xs">JPG, PNG, WEBP, PDF — maks. 10 MB każdy</span>
          </span>
          {files.length > 0 && (
            <div className="flex flex-wrap gap-2 mt-2">
              {files.map((f, i) => (
                <span key={i} className="text-xs bg-accent/10 text-accent px-2 py-1 rounded-md font-medium">
                  {f.name}
                </span>
              ))}
            </div>
          )}
        </label>
        <p className="text-xs text-text-muted">Zdjęcia miejsca montażu znacznie przyspieszają wycenę.</p>
      </div>

      {/* RODO */}
      <div className="space-y-2">
        <div className="flex items-start gap-3 cursor-pointer" onClick={() => setConsent(!consent)}>
          <div className={`size-5 rounded border-2 shrink-0 mt-0.5 flex items-center justify-center transition-colors ${
            consent ? 'bg-accent border-accent' : 'bg-white border-slate-300'
          }`}>
            {consent && <Check className="size-3 text-white" />}
          </div>
          <input type="hidden" name="consent" value={consent ? 'true' : ''} />
          <span className="text-sm text-text-muted leading-relaxed select-none">
            Wyrażam zgodę na przetwarzanie moich danych osobowych podanych w formularzu w celu obsługi zapytania przez firmę ThermCool. Zapoznałem/am się z Polityką Prywatności. *
          </span>
        </div>
      </div>

      <button
        type="submit"
        disabled={isSubmitting}
        className="btn btn-primary w-full text-white font-bold py-4 h-auto rounded-xl flex items-center justify-center gap-2 shadow-md"
      >
        {isSubmitting ? (
          <>
            <Loader2 className="w-5 h-5 animate-spin" />
            <span>Wysyłanie...</span>
          </>
        ) : (
          <span>Wyślij zapytanie</span>
        )}
      </button>
    </form>
  );
}