import { useState, useEffect } from 'react';
import { useSeoMeta } from '@unhead/react';
import { useNavigate, useParams } from 'react-router-dom';
import ngeohash from 'ngeohash';
import { Layout } from '@/components/Layout';
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 { 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 { NofferField } from '@/components/NofferField';
import {
  Store,
  Upload,
  X,
  Loader2,
  ArrowLeft,
  MapPin,
  AlertTriangle,
} from 'lucide-react';
import { Link } from 'react-router-dom';
import NotFound from './NotFound';

function EditShopSkeleton() {
  return (
    <Layout>
      <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>
    </Layout>
  );
}

export default function EditShopPage() {
  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 [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: 'Edit your skate shop.',
  });

  // 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 || '');
      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: 'Geolocation not supported',
        description: 'Your browser does not support geolocation.',
        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: 'Location found',
          description: 'Your current location has been set.',
        });
      },
      (error) => {
        setIsGettingLocation(false);
        toast({
          title: 'Location error',
          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: 'Image uploaded',
          description: 'Your image has been uploaded successfully.',
        });
      }
    } catch (error) {
      toast({
        title: 'Upload failed',
        description: error instanceof Error ? error.message : 'Failed to upload image',
        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: 'Shop name required',
        description: 'Please enter a name for your shop.',
        variant: 'destructive',
      });
      return;
    }

    if (!location.trim()) {
      toast({
        title: 'Address required',
        description: 'Please enter your shop address.',
        variant: 'destructive',
      });
      return;
    }

    if (!latitude || !longitude) {
      toast({
        title: 'Location required',
        description: 'Please enter coordinates or use your current location.',
        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: 'Invalid coordinates',
        description: 'Please enter valid latitude (-90 to 90) and longitude (-180 to 180).',
        variant: 'destructive',
      });
      return;
    }

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

      // 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()}`],
      ];

      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', noffer.trim().toLowerCase()]);
      }

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

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

      toast({
        title: 'Shop updated!',
        description: 'Your changes have been published to the network.',
      });

      navigate(`/shop/${user?.pubkey}/${shop.identifier}`);
    } catch (error) {
      toast({
        title: 'Failed to update',
        description: error instanceof Error ? error.message : 'Something went wrong',
        variant: 'destructive',
      });
    }
  };

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

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

  // Check if user is the owner
  if (!user) {
    return (
      <Layout>
        <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">Login Required</h2>
              <p className="text-muted-foreground mb-6">
                You need to log in to edit this shop.
              </p>
              <LoginArea className="justify-center" />
            </CardContent>
          </Card>
        </div>
      </Layout>
    );
  }

  if (user.pubkey !== shop.pubkey) {
    return (
      <Layout>
        <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">Access Denied</h2>
              <p className="text-muted-foreground mb-6">
                You can only edit shops that you created.
              </p>
              <Link to={`/shop/${shop.pubkey}/${shop.identifier}`}>
                <Button variant="outline">Back to Shop</Button>
              </Link>
            </CardContent>
          </Card>
        </div>
      </Layout>
    );
  }

  return (
    <Layout>
      <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" />
            Back to Shop
          </Link>
          <h1 className="text-3xl font-black uppercase neon-lime" style={{
            fontFamily: 'Impact, "Arial Black", sans-serif'
          }}>Edit Shop</h1>
          <p className="text-muted-foreground mt-1">
            Update the details for {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">Shop Details</CardTitle>
              <CardDescription className="text-gray-400">
                Update your shop information. All fields marked with * are required.
              </CardDescription>
            </CardHeader>
            <CardContent className="space-y-6">
              {/* Shop Name */}
              <div className="space-y-2">
                <Label htmlFor="name">Shop Name *</Label>
                <Input
                  id="name"
                  placeholder="e.g., Supreme Los Angeles"
                  value={name}
                  onChange={(e) => setName(e.target.value)}
                  required
                />
              </div>

              {/* Description */}
              <div className="space-y-2">
                <Label htmlFor="description">Description</Label>
                <Textarea
                  id="description"
                  placeholder="Tell people about your shop, what you sell, your specialty..."
                  value={description}
                  onChange={(e) => setDescription(e.target.value)}
                  rows={4}
                />
              </div>

              {/* Location Address */}
              <div className="space-y-2">
                <Label htmlFor="location">Shop Address *</Label>
                <Input
                  id="location"
                  placeholder="e.g., 411 N Fairfax Ave, Los Angeles, CA 90036"
                  value={location}
                  onChange={(e) => setLocation(e.target.value)}
                  required
                />
              </div>

              {/* Coordinates */}
              <div className="space-y-2">
                <Label>Coordinates *</Label>
                <div className="grid grid-cols-2 gap-4">
                  <div>
                    <Input
                      placeholder="Latitude (e.g., 34.0737)"
                      value={latitude}
                      onChange={(e) => setLatitude(e.target.value)}
                      required
                    />
                  </div>
                  <div>
                    <Input
                      placeholder="Longitude (e.g., -118.3614)"
                      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" />
                      Getting location...
                    </>
                  ) : (
                    <>
                      <MapPin className="h-4 w-4 mr-2" />
                      Use my current location
                    </>
                  )}
                </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]">Contact Information</Label>
                </div>
                <p className="text-sm text-gray-400 mb-3">
                  Help customers reach you (at least one contact method recommended)
                </p>
                
                <div className="grid grid-cols-1 sm:grid-cols-2 gap-4">
                  <div className="space-y-2">
                    <Label htmlFor="phone">Phone Number</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">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">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">
                    <Label htmlFor="instagram">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">Hours of Operation</Label>
                <Input
                  id="hours"
                  placeholder="e.g., Mon-Sat 10AM-8PM, Sun 12PM-6PM"
                  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>Shop Photos</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="Shop" 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">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" />
                    Saving...
                  </>
                ) : (
                  <>
                    <Store className="h-4 w-4 mr-2" />
                    Save Changes
                  </>
                )}
              </Button>
            </CardContent>
          </Card>
        </form>
      </div>
    </Layout>
  );
}