'use client';

import { useEffect, useState } from 'react';
import { useI18n } from '../../components/I18nProvider';
import type { Locale } from '../../../lib/i18n';

type ImageInput = { data: string; mimeType: string; altText?: string };
type SelectedImage = {
  name: string;
  size: number;
  mimeType: string;
  dataUrl: string;
};

const MAX_IMAGES = 6;
const MAX_IMAGE_BYTES = 5 * 1024 * 1024; // 5 MB per image
const SUPPORTED_LOCALES: Locale[] = ['en', 'fi', 'sv'];
type LocaleFields = { title: string; description: string; teaser: string };

export default function NewListingPage() {
  const { t, locale: uiLocale } = useI18n();
  const [slug, setSlug] = useState('');
  const [currentLocale, setCurrentLocale] = useState<Locale>(uiLocale as Locale);
  const [translations, setTranslations] = useState<Record<Locale, LocaleFields>>({
    en: { title: '', description: '', teaser: '' },
    fi: { title: '', description: '', teaser: '' },
    sv: { title: '', description: '', teaser: '' },
  });
  const [country, setCountry] = useState('Finland');
  const [region, setRegion] = useState('');
  const [city, setCity] = useState('');
  const [streetAddress, setStreetAddress] = useState('');
  const [addressNote, setAddressNote] = useState('');
  const [latitude, setLatitude] = useState<number | ''>('');
  const [longitude, setLongitude] = useState<number | ''>('');
  const [contactName, setContactName] = useState('');
  const [contactEmail, setContactEmail] = useState('');
  const [maxGuests, setMaxGuests] = useState(4);
  const [bedrooms, setBedrooms] = useState(2);
  const [beds, setBeds] = useState(3);
  const [bathrooms, setBathrooms] = useState(1);
  const [price, setPrice] = useState<number | ''>('');
  const [hasSauna, setHasSauna] = useState(true);
  const [hasFireplace, setHasFireplace] = useState(true);
  const [hasWifi, setHasWifi] = useState(true);
  const [petsAllowed, setPetsAllowed] = useState(false);
  const [byTheLake, setByTheLake] = useState(false);
  const [hasAirConditioning, setHasAirConditioning] = useState(false);
  const [hasKitchen, setHasKitchen] = useState(true);
  const [hasDishwasher, setHasDishwasher] = useState(false);
  const [hasWashingMachine, setHasWashingMachine] = useState(false);
  const [hasBarbecue, setHasBarbecue] = useState(false);
  const [evCharging, setEvCharging] = useState<'NONE' | 'FREE' | 'PAID'>('NONE');
  const [calendarUrls, setCalendarUrls] = useState('');
  const [selectedImages, setSelectedImages] = useState<SelectedImage[]>([]);
  const [coverImageIndex, setCoverImageIndex] = useState(1);
  const [message, setMessage] = useState<string | null>(null);
  const [error, setError] = useState<string | null>(null);
  const [loading, setLoading] = useState(false);
  const [isAuthed, setIsAuthed] = useState(false);
  const [aiLoading, setAiLoading] = useState(false);
  const [slugStatus, setSlugStatus] = useState<'idle' | 'checking' | 'available' | 'taken' | 'error'>('idle');

  useEffect(() => {
    setCurrentLocale(uiLocale as Locale);
  }, [uiLocale]);

  useEffect(() => {
    // simple check if session exists
    fetch('/api/auth/me', { cache: 'no-store' })
      .then((res) => res.json())
      .then((data) => setIsAuthed(Boolean(data.user)))
      .catch(() => setIsAuthed(false));
  }, []);

  function readFileAsDataUrl(file: File): Promise<SelectedImage> {
    return new Promise((resolve, reject) => {
      const reader = new FileReader();
      reader.onload = () => {
        resolve({
          name: file.name,
          size: file.size,
          mimeType: file.type || 'image/jpeg',
          dataUrl: String(reader.result),
        });
      };
      reader.onerror = reject;
      reader.readAsDataURL(file);
    });
  }

  async function handleFileChange(e: React.ChangeEvent<HTMLInputElement>) {
    const files = Array.from(e.target.files ?? []);
    setError(null);
    setMessage(null);
    if (!files.length) return;

    if (files.length > MAX_IMAGES) {
      setError(t('imagesTooMany', { count: MAX_IMAGES }));
      return;
    }

    const tooLarge = files.find((f) => f.size > MAX_IMAGE_BYTES);
    if (tooLarge) {
      setError(t('imagesTooLarge', { sizeMb: Math.floor(MAX_IMAGE_BYTES / 1024 / 1024) }));
      return;
    }

    try {
      const parsed = await Promise.all(files.map(readFileAsDataUrl));
      setSelectedImages(parsed);
      setCoverImageIndex(1);
    } catch (err) {
      setError(t('imagesReadFailed'));
    }
  }

  const amenityOptions = [
    { key: 'sauna', label: t('amenitySauna'), icon: '🧖', checked: hasSauna, toggle: setHasSauna },
    { key: 'fireplace', label: t('amenityFireplace'), icon: '🔥', checked: hasFireplace, toggle: setHasFireplace },
    { key: 'wifi', label: t('amenityWifi'), icon: '📶', checked: hasWifi, toggle: setHasWifi },
    { key: 'pets', label: t('amenityPets'), icon: '🐾', checked: petsAllowed, toggle: setPetsAllowed },
    { key: 'lake', label: t('amenityLake'), icon: '🌊', checked: byTheLake, toggle: setByTheLake },
    { key: 'ac', label: t('amenityAirConditioning'), icon: '❄️', checked: hasAirConditioning, toggle: setHasAirConditioning },
    { key: 'kitchen', label: t('amenityKitchen'), icon: '🍽️', checked: hasKitchen, toggle: setHasKitchen },
    { key: 'dishwasher', label: t('amenityDishwasher'), icon: '🧼', checked: hasDishwasher, toggle: setHasDishwasher },
    { key: 'washer', label: t('amenityWashingMachine'), icon: '🧺', checked: hasWashingMachine, toggle: setHasWashingMachine },
    { key: 'barbecue', label: t('amenityBarbecue'), icon: '🍖', checked: hasBarbecue, toggle: setHasBarbecue },
  ];

  function updateTranslation(locale: Locale, field: keyof LocaleFields, value: string) {
    setTranslations((prev) => ({
      ...prev,
      [locale]: { ...prev[locale], [field]: value },
    }));
  }

  function localeStatus(locale: Locale) {
    const { title, description } = translations[locale];
    if (!title && !description) return 'missing';
    if (title && description) return 'ready';
    return 'partial';
  }

  async function autoTranslate() {
    if (aiLoading) return;
    setMessage(null);
    setError(null);
    setAiLoading(true);
    try {
      const res = await fetch('/api/listings/translate', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ translations, currentLocale }),
      });
      const data = await res.json();
      if (!res.ok || !data.translations) {
        throw new Error('bad response');
      }
      const incoming = data.translations as Record<Locale, LocaleFields>;
      setTranslations((prev) => {
        const next = { ...prev };
        SUPPORTED_LOCALES.forEach((loc) => {
          const aiLoc = incoming?.[loc];
          next[loc] = {
            title: prev[loc].title || aiLoc?.title || '',
            teaser: prev[loc].teaser || aiLoc?.teaser || '',
            description: prev[loc].description || aiLoc?.description || '',
          };
        });
        return next;
      });
      setMessage(t('aiAutoSuccess'));
    } catch (err) {
      setError(t('aiAutoError'));
    } finally {
      setAiLoading(false);
    }
  }

  function parseImages(): ImageInput[] {
    return selectedImages.map((img) => ({
      data: img.dataUrl,
      mimeType: img.mimeType,
      altText: img.name.replace(/[-_]/g, ' '),
    }));
  }

  async function checkSlugAvailability() {
    const value = slug.trim().toLowerCase();
    if (!value) {
      setSlugStatus('idle');
      return;
    }
    setSlugStatus('checking');
    try {
      const res = await fetch(`/api/listings/check-slug?slug=${encodeURIComponent(value)}`, { cache: 'no-store' });
      const data = await res.json();
      if (!res.ok || typeof data.available !== 'boolean') {
        throw new Error('bad response');
      }
      setSlugStatus(data.available ? 'available' : 'taken');
    } catch (err) {
      setSlugStatus('error');
    }
  }

  async function onSubmit(e: React.FormEvent) {
    e.preventDefault();
    setMessage(null);
    setError(null);
    setLoading(true);
    try {
      const translationEntries = SUPPORTED_LOCALES.map((loc) => ({
        locale: loc,
        title: translations[loc].title.trim(),
        description: translations[loc].description.trim(),
        teaser: translations[loc].teaser.trim(),
      })).filter((t) => t.title && t.description);

      if (translationEntries.length === 0) {
        setError(t('translationMissing'));
        setLoading(false);
        return;
      }

      if (selectedImages.length === 0) {
        setError(t('imagesRequired'));
        setLoading(false);
        return;
      }

      const res = await fetch('/api/listings', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          slug,
          translations: translationEntries.map((t) => ({
            ...t,
            slug,
            teaser: t.teaser || null,
          })),
          country,
          region,
          city,
          streetAddress,
          addressNote,
          latitude: latitude === '' ? null : latitude,
          longitude: longitude === '' ? null : longitude,
          contactName,
          contactEmail,
          maxGuests,
          bedrooms,
          beds,
          bathrooms,
          priceHintPerNightEuros: price === '' ? null : Math.round(Number(price)),
          hasSauna,
          hasFireplace,
          hasWifi,
          petsAllowed,
          byTheLake,
          hasAirConditioning,
          hasKitchen,
          hasDishwasher,
          hasWashingMachine,
          hasBarbecue,
          evCharging,
          coverImageIndex,
          images: parseImages(),
          calendarUrls,
        }),
      });
      const data = await res.json();
      if (!res.ok) {
        setError(data.error || 'Failed to create listing');
      } else {
        setMessage(t('createListingSuccess', { id: data.listing.id, status: data.listing.status }));
        setSlug('');
        setTranslations({
          en: { title: '', description: '', teaser: '' },
          fi: { title: '', description: '', teaser: '' },
          sv: { title: '', description: '', teaser: '' },
        });
        setRegion('');
        setCity('');
        setStreetAddress('');
        setAddressNote('');
        setLatitude('');
        setLongitude('');
        setContactName('');
        setContactEmail('');
        setCalendarUrls('');
        setSelectedImages([]);
        setCoverImageIndex(1);
      }
    } catch (err) {
      setError('Failed to create listing');
    } finally {
      setLoading(false);
    }
  }

  if (!isAuthed) {
    return (
      <main className="panel" style={{ maxWidth: 720, margin: '40px auto' }}>
        <h1>{t('createListingTitle')}</h1>
        <p>{t('loginToCreate')}</p>
      </main>
    );
  }

  return (
    <main className="panel" style={{ maxWidth: 1100, margin: '40px auto' }}>
      <h1>{t('createListingTitle')}</h1>
      <form onSubmit={onSubmit} style={{ display: 'grid', gap: 10 }}>
        <label>
          {t('slugLabel')}
          <input value={slug} onChange={(e) => setSlug(e.target.value)} onBlur={checkSlugAvailability} required />
          <div style={{ display: 'flex', alignItems: 'center', gap: 8, marginTop: 4, flexWrap: 'wrap' }}>
            <span style={{ color: '#cbd5e1', fontSize: 12 }}>{t('slugHelp')}</span>
            {slugStatus === 'checking' ? <span style={{ color: '#cbd5e1', fontSize: 12 }}>{t('slugChecking')}</span> : null}
            {slugStatus === 'available' ? <span style={{ color: '#34d399', fontSize: 12 }}>{t('slugAvailable')}</span> : null}
            {slugStatus === 'taken' ? <span style={{ color: '#f87171', fontSize: 12 }}>{t('slugTaken')}</span> : null}
            {slugStatus === 'error' ? <span style={{ color: '#facc15', fontSize: 12 }}>{t('slugCheckError')}</span> : null}
          </div>
        </label>
        <div>
          <div style={{ display: 'flex', gap: 8, alignItems: 'center', flexWrap: 'wrap', marginBottom: 6 }}>
            <strong>{t('languageTabsLabel')}</strong>
            <span style={{ color: '#cbd5e1', fontSize: 13 }}>{t('languageTabsHint')}</span>
          </div>
          <div style={{ display: 'flex', gap: 8, flexWrap: 'wrap' }}>
            {SUPPORTED_LOCALES.map((loc) => {
              const status = localeStatus(loc);
              const badge =
                status === 'ready' ? t('localeReady') : status === 'partial' ? t('localePartial') : t('localeMissing');
              return (
                <button
                  key={loc}
                  type="button"
                  onClick={() => setCurrentLocale(loc)}
                  className={`button ${currentLocale === loc ? '' : 'secondary'}`}
                >
                  {loc.toUpperCase()} · {badge}
                </button>
              );
            })}
          </div>
        </div>
        <div
          style={{
            display: 'grid',
            gap: 12,
            gridTemplateColumns: 'repeat(auto-fit, minmax(320px, 1fr))',
            alignItems: 'start',
          }}
        >
          <div style={{ display: 'grid', gap: 8 }}>
            <label>
              {t('titleLabel')}
              <input value={translations[currentLocale].title} onChange={(e) => updateTranslation(currentLocale, 'title', e.target.value)} required />
            </label>
            <label>
              {t('descriptionLabel')}
              <textarea value={translations[currentLocale].description} onChange={(e) => updateTranslation(currentLocale, 'description', e.target.value)} required rows={4} />
            </label>
            <label>
              {t('teaserLabel')}
              <input value={translations[currentLocale].teaser} onChange={(e) => updateTranslation(currentLocale, 'teaser', e.target.value)} />
            </label>
          </div>
          <div className="panel" style={{ border: '1px solid rgba(148,163,184,0.3)', background: 'rgba(255,255,255,0.02)' }}>
            <h3 style={{ marginTop: 0 }}>{t('aiHelperTitle')}</h3>
            <p style={{ color: '#cbd5e1', marginTop: 4 }}>{t('aiAutoExplain')}</p>
            <div style={{ display: 'flex', gap: 10, marginTop: 8, flexWrap: 'wrap', alignItems: 'center' }}>
              <button type="button" className="button secondary" onClick={autoTranslate} disabled={aiLoading}>
                {aiLoading ? t('aiAutoTranslating') : t('aiAutoTranslate')}
              </button>
              <span style={{ color: '#cbd5e1', fontSize: 13 }}>{t('aiHelperNote')}</span>
            </div>
          </div>
        </div>
        <div style={{ display: 'grid', gap: 8, gridTemplateColumns: 'repeat(auto-fit, minmax(180px, 1fr))' }}>
          <label>
            {t('countryLabel')}
            <input value={country} onChange={(e) => setCountry(e.target.value)} required />
          </label>
          <label>
            {t('regionLabel')}
            <input value={region} onChange={(e) => setRegion(e.target.value)} required />
          </label>
          <label>
            {t('cityLabel')}
            <input value={city} onChange={(e) => setCity(e.target.value)} required />
          </label>
        </div>
        <label>
          {t('streetAddressLabel')}
          <input value={streetAddress} onChange={(e) => setStreetAddress(e.target.value)} required />
        </label>
        <label>
          {t('addressNoteLabel')}
          <input value={addressNote} onChange={(e) => setAddressNote(e.target.value)} placeholder={t('addressNotePlaceholder')} />
        </label>
        <label>
          {t('contactNameLabel')}
          <input value={contactName} onChange={(e) => setContactName(e.target.value)} required />
        </label>
        <label>
          {t('contactEmailLabel')}
          <input type="email" value={contactEmail} onChange={(e) => setContactEmail(e.target.value)} required />
        </label>
        <div style={{ display: 'grid', gap: 8, gridTemplateColumns: 'repeat(auto-fit, minmax(150px, 1fr))' }}>
          <label>
            {t('maxGuestsLabel')}
            <select value={maxGuests} onChange={(e) => setMaxGuests(Number(e.target.value))}>
              {[2, 4, 6, 8, 10, 12, 14, 16].map((n) => (
                <option key={n} value={n}>
                  {n}
                </option>
              ))}
            </select>
          </label>
          <label>
            {t('bedroomsLabel')}
            <select value={bedrooms} onChange={(e) => setBedrooms(Number(e.target.value))}>
              {[0, 1, 2, 3, 4, 5, 6].map((n) => (
                <option key={n} value={n}>
                  {n}
                </option>
              ))}
            </select>
          </label>
          <label>
            {t('bedsLabel')}
            <select value={beds} onChange={(e) => setBeds(Number(e.target.value))}>
              {[1, 2, 3, 4, 5, 6, 8, 10].map((n) => (
                <option key={n} value={n}>
                  {n}
                </option>
              ))}
            </select>
          </label>
          <label>
            {t('bathroomsLabel')}
            <select value={bathrooms} onChange={(e) => setBathrooms(Number(e.target.value))}>
              {[1, 2, 3, 4].map((n) => (
                <option key={n} value={n}>
                  {n}
                </option>
              ))}
            </select>
          </label>
          <label>
            {t('priceHintLabel')}
            <input
              type="number"
              value={price}
              onChange={(e) => setPrice(e.target.value === '' ? '' : Number(e.target.value))}
              min={0}
              step="10"
              placeholder="e.g. 120"
            />
            <div style={{ color: '#cbd5e1', fontSize: 12 }}>{t('priceHintHelp')}</div>
          </label>
          <label style={{ gridColumn: '1 / -1' }}>
            {t('calendarUrlsLabel')}
            <textarea
              value={calendarUrls}
              onChange={(e) => setCalendarUrls(e.target.value)}
              placeholder="https://example.com/calendar.ics"
              rows={3}
            />
            <div style={{ color: '#cbd5e1', fontSize: 12 }}>{t('calendarUrlsHelp')}</div>
          </label>
        </div>
        <div style={{ display: 'grid', gap: 8, gridTemplateColumns: 'repeat(auto-fit, minmax(150px, 1fr))' }}>
          <label>
            {t('latitudeLabel')}
            <input type="number" value={latitude} onChange={(e) => setLatitude(e.target.value === '' ? '' : Number(e.target.value))} step="0.000001" />
          </label>
          <label>
            {t('longitudeLabel')}
            <input type="number" value={longitude} onChange={(e) => setLongitude(e.target.value === '' ? '' : Number(e.target.value))} step="0.000001" />
          </label>
        </div>
        <div className="amenity-grid">
          {amenityOptions.map((option) => (
            <button
              key={option.key}
              type="button"
              className={`amenity-option ${option.checked ? 'selected' : ''}`}
              aria-pressed={option.checked}
              onClick={() => option.toggle(!option.checked)}
            >
              <div className="amenity-option-meta">
                <span aria-hidden className="amenity-emoji">
                  {option.icon}
                </span>
                <span className="amenity-name">{option.label}</span>
              </div>
              <span className="amenity-check" aria-hidden>
                {option.checked ? '✓' : ''}
              </span>
            </button>
          ))}
          <div className="amenity-ev">
            <div className="amenity-ev-label">{t('evChargingLabel')}</div>
            <div className="ev-toggle-group">
              {[
                { value: 'NONE', label: t('evChargingNone'), icon: '🚗' },
                { value: 'FREE', label: t('evChargingFree'), icon: '⚡' },
                { value: 'PAID', label: t('evChargingPaid'), icon: '💳' },
              ].map((opt) => (
                <button
                  key={opt.value}
                  type="button"
                  className={`ev-toggle ${evCharging === opt.value ? 'active' : ''}`}
                  onClick={() => setEvCharging(opt.value as typeof evCharging)}
                >
                  <span aria-hidden className="amenity-emoji">
                    {opt.icon}
                  </span>
                  {opt.label}
                </button>
              ))}
            </div>
          </div>
        </div>
        <div style={{ display: 'grid', gap: 8, gridTemplateColumns: 'repeat(auto-fit, minmax(240px, 1fr))' }}>
          <label>
            {t('imagesLabel')}
            <input type="file" accept="image/*" multiple onChange={handleFileChange} />
            <div style={{ color: '#cbd5e1', fontSize: 12, marginTop: 4 }}>{t('imagesHelp', { count: MAX_IMAGES, sizeMb: Math.floor(MAX_IMAGE_BYTES / 1024 / 1024) })}</div>
          </label>
          <label>
            {t('coverImageLabel')}
            <input type="number" min={1} max={selectedImages.length || 1} value={coverImageIndex} onChange={(e) => setCoverImageIndex(Number(e.target.value))} />
            <div style={{ color: '#cbd5e1', fontSize: 12, marginTop: 4 }}>{t('coverImageHelp')}</div>
          </label>
        </div>
        {selectedImages.length > 0 ? (
          <div style={{ display: 'grid', gap: 8, gridTemplateColumns: 'repeat(auto-fit, minmax(180px, 1fr))' }}>
            {selectedImages.map((img, idx) => (
              <div key={img.name + idx} style={{ border: '1px solid rgba(148,163,184,0.3)', padding: 8, borderRadius: 8 }}>
                <div style={{ fontWeight: 600 }}>{img.name}</div>
                <div style={{ fontSize: 12, color: '#cbd5e1' }}>
                  {(img.size / 1024).toFixed(0)} KB · {img.mimeType || 'image/jpeg'}
                </div>
                <div style={{ fontSize: 12, marginTop: 4 }}>{t('coverChoice', { index: idx + 1 })}</div>
              </div>
            ))}
          </div>
        ) : null}
        <button className="button" type="submit" disabled={loading}>
          {loading ? t('submittingListing') : t('submitListing')}
        </button>
      </form>
      {message ? <p style={{ marginTop: 12, color: 'green' }}>{message}</p> : null}
      {error ? <p style={{ marginTop: 12, color: 'red' }}>{error}</p> : null}
    </main>
  );
}