import { useState, useEffect } from 'react';
import { useSeoMeta } from '@unhead/react';
import { useNavigate, useParams } from 'react-router-dom';
import ngeohash from 'ngeohash';
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Textarea } from '@/components/ui/textarea';
import { Label } from '@/components/ui/label';
import { Skeleton } from '@/components/ui/skeleton';
import { useNostrPublish } from '@/hooks/useNostrPublish';
import { useCurrentUser } from '@/hooks/useCurrentUser';
import { Nip05HandlesEditor } from '@/components/Nip05HandlesEditor';
import { useUploadFile } from '@/hooks/useUploadFile';
import { useToast } from '@/hooks/useToast';
import { useShop } from '@/hooks/useShops';
import { LoginArea } from '@/components/auth/LoginArea';
import { SKATE_SHOP_KIND, isValidNoffer } from '@/lib/types';
import { normalizeClinkCode } from '@/lib/clink';
import { reverseGeocodeRegions, pushRegionTags } from '@/lib/geocodeRegions';
import { NofferField } from '@/components/NofferField';
import {
  Store,
  Upload,
  X,
  Loader2,
  ArrowLeft,
  MapPin,
  AlertTriangle,
} from 'lucide-react';
import { Link } from 'react-router-dom';
import { useTranslation } from '@/contexts/language';
import NotFound from './NotFound';

function EditShopSkeleton() {
  return (
    <>
      <div className="container px-4 py-8 max-w-2xl">
        <Skeleton className="h-6 w-32 mb-4" />
        <Skeleton className="h-10 w-64 mb-2" />
        <Skeleton className="h-5 w-48 mb-6" />
        <Card>
          <CardHeader>
            <Skeleton className="h-6 w-32" />
            <Skeleton className="h-4 w-64" />
          </CardHeader>
          <CardContent className="space-y-6">
            <Skeleton className="h-10 w-full" />
            <Skeleton className="h-24 w-full" />
            <Skeleton className="h-10 w-full" />
            <div className="grid grid-cols-2 gap-4">
              <Skeleton className="h-10 w-full" />
              <Skeleton className="h-10 w-full" />
            </div>
            <Skeleton className="h-10 w-full" />
          </CardContent>
        </Card>
      </div>
    </>
  );
}

export default function EditShopPage() {
  const { t } = useTranslation();
  const { pubkey, identifier } = useParams<{ pubkey: string; identifier: string }>();
  const navigate = useNavigate();
  const { user } = useCurrentUser();
  const { data: shop, isLoading, error } = useShop(identifier || '', pubkey);
  const { mutateAsync: createEvent, isPending: isPublishing } = useNostrPublish();
  const { mutateAsync: uploadFile, isPending: isUploading } = useUploadFile();
  const { toast } = useToast();

  // Form state
  const [name, setName] = useState('');
  const [description, setDescription] = useState('');
  const [location, setLocation] = useState('');
  const [latitude, setLatitude] = useState('');
  const [longitude, setLongitude] = useState('');
  const [phone, setPhone] = useState('');
  const [email, setEmail] = useState('');
  const [website, setWebsite] = useState('');
  const [instagram, setInstagram] = useState('');
  const [hours, setHours] = useState('');
  const [noffer, setNoffer] = useState('');
  const [nip05s, setNip05s] = useState<string[]>([]);
  const [images, setImages] = useState<string[]>([]);
  const [isGettingLocation, setIsGettingLocation] = useState(false);
  const [initialized, setInitialized] = useState(false);

  useSeoMeta({
    title: shop ? `Edit ${shop.name} - SkateSpots` : 'Edit Shop - SkateSpots',
    description: t('seoUi.editShopDesc'),
  });

  // Initialize form with existing data
  useEffect(() => {
    if (shop && !initialized) {
      setName(shop.name);
      setDescription(shop.description || '');
      setLocation(shop.location || '');
      setPhone(shop.phone || '');
      setEmail(shop.email || '');
      setWebsite(shop.website || '');
      setInstagram(shop.instagram || '');
      setHours(shop.hours || '');
      setNoffer(shop.noffer || '');
      setNip05s(shop.nip05s ?? []);
      setImages(shop.images);

      // Decode geohash to get coordinates
      if (shop.geohash) {
        const { latitude: lat, longitude: lng } = ngeohash.decode(shop.geohash);
        setLatitude(lat.toFixed(6));
        setLongitude(lng.toFixed(6));
      }

      setInitialized(true);
    }
  }, [shop, initialized]);

  const getCurrentLocation = () => {
    if (!navigator.geolocation) {
      toast({
        title: t('placesUi.createEvent.geoNotSupported'),
        description: t('placesUi.createEvent.geoNotSupportedDesc'),
        variant: 'destructive',
      });
      return;
    }

    setIsGettingLocation(true);
    navigator.geolocation.getCurrentPosition(
      (position) => {
        setLatitude(position.coords.latitude.toFixed(6));
        setLongitude(position.coords.longitude.toFixed(6));
        setIsGettingLocation(false);
        toast({
          title: t('placesUi.createEvent.locationFound'),
          description: t('placesUi.createEvent.locationFoundDesc'),
        });
      },
      (error) => {
        setIsGettingLocation(false);
        toast({
          title: t('placesUi.createEvent.locationError'),
          description: error.message,
          variant: 'destructive',
        });
      }
    );
  };

  const handleImageUpload = async (e: React.ChangeEvent<HTMLInputElement>) => {
    const files = e.target.files;
    if (!files || files.length === 0) return;

    try {
      const file = files[0];
      const tags = await uploadFile(file);
      const url = tags[0]?.[1];
      if (url) {
        setImages((prev) => [...prev, url]);
        toast({
          title: t('placesUi.createEvent.imageUploaded'),
          description: t('placesUi.createEvent.imageUploadedDesc'),
        });
      }
    } catch (error) {
      toast({
        title: t('placesUi.createEvent.uploadFailed'),
        description: error instanceof Error ? error.message : t('placesUi.createEvent.uploadFailedDesc'),
        variant: 'destructive',
      });
    }

    e.target.value = '';
  };

  const removeImage = (url: string) => {
    setImages((prev) => prev.filter((img) => img !== url));
  };

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();

    if (!shop) return;

    if (!name.trim()) {
      toast({
        title: t('placesUi.createShop.nameRequired'),
        description: t('placesUi.createShop.nameRequiredDesc'),
        variant: 'destructive',
      });
      return;
    }

    if (!location.trim()) {
      toast({
        title: t('placesUi.createShop.addressRequired'),
        description: t('placesUi.createShop.addressRequiredDesc'),
        variant: 'destructive',
      });
      return;
    }

    if (!latitude || !longitude) {
      toast({
        title: t('placesUi.createShop.locationRequired'),
        description: t('placesUi.createShop.locationRequiredDesc'),
        variant: 'destructive',
      });
      return;
    }

    const lat = parseFloat(latitude);
    const lng = parseFloat(longitude);

    if (isNaN(lat) || isNaN(lng) || lat < -90 || lat > 90 || lng < -180 || lng > 180) {
      toast({
        title: t('placesUi.createShop.invalidCoords'),
        description: t('placesUi.createShop.invalidCoordsDesc'),
        variant: 'destructive',
      });
      return;
    }

    try {
      // Generate geohash from coordinates (7 chars = ~153m precision)
      const geohash = ngeohash.encode(lat, lng, 7);

      // Best-effort reverse geocode → city/country/country_code (same helper as
      // spot/shop creation; never throws). Re-runs on edit so a moved shop's
      // region tags stay correct.
      const geo = await reverseGeocodeRegions(lat, lng);

      // Build tags - use the same identifier to update the addressable event
      const tags: string[][] = [
        ['d', shop.identifier],
        ['name', name.trim()],
        ['g', geohash],
        ['t', 'skateshop'],
        ['lat', lat.toString()],
        ['lon', lng.toString()],
        ['location', location.trim()],
        ['alt', `Skate shop: ${name.trim()}`],
      ];
      pushRegionTags(tags, geo);

      if (phone.trim()) {
        tags.push(['phone', phone.trim()]);
      }

      if (email.trim()) {
        tags.push(['email', email.trim()]);
      }

      if (website.trim()) {
        tags.push(['website', website.trim()]);
      }

      if (instagram.trim()) {
        tags.push(['instagram', instagram.trim()]);
      }

      if (hours.trim()) {
        tags.push(['hours', hours.trim()]);
      }

      if (isValidNoffer(noffer.trim())) {
        tags.push(['noffer', normalizeClinkCode(noffer)]);
      }

      for (const handle of nip05s) tags.push(['nip05', handle]);

      for (const imageUrl of images) {
        // Use imeta tag for NIP-92 compatibility
        tags.push(['imeta', `url ${imageUrl}`, 'm image/jpeg']);
      }

      // Carry through any tag this form doesn't manage, untouched. A shop is an
      // addressable NIP-15 stall, so re-publishing REPLACES the whole tag set —
      // rebuilding only the fields on this form would silently strip anything
      // else the stall carries (e.g. currency/shipping from another client, or
      // future tags), just like the event-edit fix. `t` is special: this form
      // owns the 'skateshop' marker, so keep every OTHER topic tag.
      const MANAGED_TAGS = new Set([
        'd', 'name', 'g', 'lat', 'lon', 'location', 'alt',
        'phone', 'email', 'website', 'instagram', 'hours', 'noffer', 'imeta', 'nip05',
      ]);
      for (const tag of shop.event.tags) {
        const [tagName, tagValue] = tag;
        if (MANAGED_TAGS.has(tagName)) continue;
        if (tagName === 't') {
          if (tagValue !== 'skateshop') tags.push(tag); // keep foreign topics
          continue;
        }
        tags.push(tag);
      }

      await createEvent({
        kind: SKATE_SHOP_KIND,
        content: description.trim(),
        tags,
      });

      toast({
        title: t('placesUi.editShop.updated'),
        description: t('placesUi.editEvent.updatedDesc'),
      });

      navigate(`/shop/${user?.pubkey}/${shop.identifier}`);
    } catch (error) {
      toast({
        title: t('placesUi.editEvent.updateFailed'),
        description: error instanceof Error ? error.message : t('placesUi.createEvent.somethingWrong'),
        variant: 'destructive',
      });
    }
  };

  if (isLoading) {
    return <EditShopSkeleton />;
  }

  if (error || !shop) {
    return <NotFound />;
  }

  // Check if user is the owner
  if (!user) {
    return (
      <>
        <div className="container px-4 py-8">
          <Card className="max-w-xl mx-auto border-dashed">
            <CardContent className="py-12 text-center">
              <Store className="h-12 w-12 mx-auto mb-4 text-muted-foreground/50" />
              <h2 className="text-xl font-bold mb-2">{t('errors.loginRequired')}</h2>
              <p className="text-muted-foreground mb-6">
                {t('placesUi.editShop.loginToEdit')}
              </p>
              <LoginArea className="justify-center" />
            </CardContent>
          </Card>
        </div>
      </>
    );
  }

  if (user.pubkey !== shop.pubkey) {
    return (
      <>
        <div className="container px-4 py-8">
          <Card className="max-w-xl mx-auto border-destructive">
            <CardContent className="py-12 text-center">
              <AlertTriangle className="h-12 w-12 mx-auto mb-4 text-destructive" />
              <h2 className="text-xl font-bold mb-2">{t('placesUi.editEvent.accessDenied')}</h2>
              <p className="text-muted-foreground mb-6">
                {t('placesUi.editShop.accessDeniedDesc')}
              </p>
              <Link to={`/shop/${shop.pubkey}/${shop.identifier}`}>
                <Button variant="outline">{t('placesUi.editShop.backToShop')}</Button>
              </Link>
            </CardContent>
          </Card>
        </div>
      </>
    );
  }

  return (
    <>
      <div className="container px-4 py-8 max-w-2xl">
        <div className="mb-6">
          <Link
            to={`/shop/${shop.pubkey}/${shop.identifier}`}
            className="inline-flex items-center text-muted-foreground hover:text-foreground transition-colors mb-4"
          >
            <ArrowLeft className="h-4 w-4 mr-2" />
            {t('placesUi.editShop.backToShop')}
          </Link>
          <h1 className="text-3xl font-black uppercase neon-lime" style={{
            fontFamily: 'Impact, "Arial Black", sans-serif'
          }}>{t('shops.editShop')}</h1>
          <p className="text-muted-foreground mt-1">
            {t('placesUi.editShop.updateDetails', { name: shop.name })}
          </p>
        </div>

        <form onSubmit={handleSubmit}>
          <Card className="bg-black/90 border-2 border-[#ccff00]/30">
            <CardHeader>
              <CardTitle className="text-[#ccff00] uppercase font-black">{t('shops.shopDetails')}</CardTitle>
              <CardDescription className="text-gray-400">
                {t('placesUi.editShop.detailsDesc')}
              </CardDescription>
            </CardHeader>
            <CardContent className="space-y-6">
              {/* Shop Name */}
              <div className="space-y-2">
                <Label htmlFor="name">{t('shops.shopName')} *</Label>
                <Input
                  id="name"
                  placeholder={t('placesUi.createShop.namePlaceholder')}
                  value={name}
                  onChange={(e) => setName(e.target.value)}
                  required
                />
              </div>

              {/* Description */}
              <div className="space-y-2">
                <Label htmlFor="description">{t('spots.description')}</Label>
                <Textarea
                  id="description"
                  placeholder={t('placesUi.createShop.descriptionPlaceholder')}
                  value={description}
                  onChange={(e) => setDescription(e.target.value)}
                  rows={4}
                />
              </div>

              {/* Location Address */}
              <div className="space-y-2">
                <Label htmlFor="location">{t('placesUi.createShop.address')} *</Label>
                <Input
                  id="location"
                  placeholder={t('placesUi.createShop.addressPlaceholder')}
                  value={location}
                  onChange={(e) => setLocation(e.target.value)}
                  required
                />
              </div>

              {/* Coordinates */}
              <div className="space-y-2">
                <Label>{t('createSpot.coordinates')} *</Label>
                <div className="grid grid-cols-2 gap-4">
                  <div>
                    <Input
                      placeholder={t('placesUi.createShop.latPlaceholder')}
                      value={latitude}
                      onChange={(e) => setLatitude(e.target.value)}
                      required
                    />
                  </div>
                  <div>
                    <Input
                      placeholder={t('placesUi.createShop.lngPlaceholder')}
                      value={longitude}
                      onChange={(e) => setLongitude(e.target.value)}
                      required
                    />
                  </div>
                </div>
                <Button
                  type="button"
                  variant="outline"
                  size="sm"
                  onClick={getCurrentLocation}
                  disabled={isGettingLocation}
                  className="mt-2"
                >
                  {isGettingLocation ? (
                    <>
                      <Loader2 className="h-4 w-4 mr-2 animate-spin" />
                      {t('createSpot.gettingLocation')}
                    </>
                  ) : (
                    <>
                      <MapPin className="h-4 w-4 mr-2" />
                      {t('createSpot.useCurrentLocation')}
                    </>
                  )}
                </Button>
              </div>

              {/* Contact Information */}
              <div className="space-y-3 p-4 rounded-lg border-2 border-[#ccff00]/30 bg-[#ccff00]/5">
                <div className="flex items-center gap-2 mb-2">
                  <span className="text-2xl">📞</span>
                  <Label className="text-base font-bold text-[#ccff00]">{t('placesUi.createShop.contactInfo')}</Label>
                </div>
                <p className="text-sm text-gray-400 mb-3">
                  {t('placesUi.createShop.contactHint')}
                </p>
                
                <div className="grid grid-cols-1 sm:grid-cols-2 gap-4">
                  <div className="space-y-2">
                    <Label htmlFor="phone">{t('placesUi.createShop.phoneNumber')}</Label>
                    <Input
                      id="phone"
                      type="tel"
                      placeholder="+1 234 567 8900"
                      value={phone}
                      onChange={(e) => setPhone(e.target.value)}
                      className="bg-black border-[#ccff00]/30"
                    />
                  </div>
                  <div className="space-y-2">
                    <Label htmlFor="email">{t('placesUi.createShop.email')}</Label>
                    <Input
                      id="email"
                      type="email"
                      placeholder="shop@example.com"
                      value={email}
                      onChange={(e) => setEmail(e.target.value)}
                      className="bg-black border-[#ccff00]/30"
                    />
                  </div>
                  <div className="space-y-2">
                    <Label htmlFor="website">{t('shops.website')}</Label>
                    <Input
                      id="website"
                      type="url"
                      placeholder="https://myshop.com"
                      value={website}
                      onChange={(e) => setWebsite(e.target.value)}
                      className="bg-black border-[#ccff00]/30"
                    />
                  </div>
                  <div className="space-y-2 sm:col-span-2">
                    <Label className="flex items-center gap-2">
                      {t('shops.nip05')}
                      <span className="text-xs font-normal text-muted-foreground">{t('socialUi.form.optional')}</span>
                    </Label>
                    <p className="text-xs text-muted-foreground">{t('shops.nip05Hint')}</p>
                    <Nip05HandlesEditor handles={nip05s} onChange={setNip05s} pubkey={user?.pubkey} inputId="shop-nip05" accent="lime" />
                  </div>
                  <div className="space-y-2">
                    <Label htmlFor="instagram">{t('placesUi.createShop.instagram')}</Label>
                    <Input
                      id="instagram"
                      placeholder="@shopname"
                      value={instagram}
                      onChange={(e) => setInstagram(e.target.value)}
                      className="bg-black border-[#ccff00]/30"
                    />
                  </div>
                </div>
              </div>

              {/* Hours of Operation */}
              <div className="space-y-2">
                <Label htmlFor="hours">{t('placesUi.createShop.hoursOfOperation')}</Label>
                <Input
                  id="hours"
                  placeholder={t('placesUi.createShop.hoursPlaceholder')}
                  value={hours}
                  onChange={(e) => setHours(e.target.value)}
                />
              </div>

              {/* CLINK self-custodial payments (optional) */}
              <NofferField value={noffer} onChange={setNoffer} />

              {/* Images */}
              <div className="space-y-2">
                <Label>{t('placesUi.createShop.shopPhotos')}</Label>
                <div className="grid grid-cols-3 gap-4">
                  {images.map((url) => (
                    <div key={url} className="relative aspect-video rounded-lg overflow-hidden bg-muted">
                      <img src={url} alt={t('placesUi.createShop.shopPhotoAlt')} className="w-full h-full object-cover" />
                      <button
                        type="button"
                        onClick={() => removeImage(url)}
                        className="absolute top-1 right-1 p-1 rounded-full bg-background/80 hover:bg-destructive hover:text-destructive-foreground transition-colors"
                      >
                        <X className="h-4 w-4" />
                      </button>
                    </div>
                  ))}
                  <label className="aspect-video rounded-lg border-2 border-dashed flex flex-col items-center justify-center cursor-pointer hover:bg-muted/50 transition-colors">
                    <input
                      type="file"
                      accept="image/*"
                      className="hidden"
                      onChange={handleImageUpload}
                      disabled={isUploading}
                    />
                    {isUploading ? (
                      <Loader2 className="h-6 w-6 animate-spin text-muted-foreground" />
                    ) : (
                      <>
                        <Upload className="h-6 w-6 text-muted-foreground mb-1" />
                        <span className="text-xs text-muted-foreground">{t('placesUi.createShop.upload')}</span>
                      </>
                    )}
                  </label>
                </div>
              </div>

              {/* Submit */}
              <Button
                type="submit"
                className="w-full bg-[#ccff00] text-black hover:bg-[#ccff00]/90 font-black uppercase"
                disabled={isPublishing || isUploading}
              >
                {isPublishing ? (
                  <>
                    <Loader2 className="h-4 w-4 mr-2 animate-spin" />
                    {t('placesUi.editEvent.saving')}
                  </>
                ) : (
                  <>
                    <Store className="h-4 w-4 mr-2" />
                    {t('placesUi.editEvent.saveChanges')}
                  </>
                )}
              </Button>
            </CardContent>
          </Card>
        </form>
      </div>
    </>
  );
}