import { useState } from 'react';
import { useNavigate, Link } from 'react-router-dom';
import ngeohash from 'ngeohash';
import { nip19 } from 'nostr-tools';
import { Layout } from '@/components/Layout';
import { Card, CardContent } 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 { Switch } from '@/components/ui/switch';
import { useNostrPublish } from '@/hooks/useNostrPublish';
import { useCurrentUser } from '@/hooks/useCurrentUser';
import { useAuthor } from '@/hooks/useAuthor';
import { useUploadFile } from '@/hooks/useUploadFile';
import { useToast } from '@/hooks/useToast';
import { LoginArea } from '@/components/auth/LoginArea';
import { NofferField } from '@/components/NofferField';
import { PaymentReadinessNote } from '@/components/PaymentReadinessNote';
import { EntityTypeField } from '@/components/EntityTypeField';
import { CrewLinkField } from '@/components/CrewLinkField';
import { LabProUpgrade } from '@/components/LabProUpgrade';
import { usePlatformFee } from '@/hooks/usePlatformFee';
import { isValidNoffer, type EntityType } from '@/lib/types';
import { cn } from '@/lib/utils';
import { Upload, X, Loader2, ArrowLeft, MapPin } from 'lucide-react';

/** A group of selectable tag chips (e.g. "Genre", "Instruments"). */
export interface SkillSection {
  title: string;
  /** [tagValue, label] pairs. */
  entries: [string, string][];
  /** If true, at least one must be selected before publishing. */
  required?: boolean;
}

/** A freeform extra field specific to a craft (e.g. tattoo studio, music links). */
export interface ExtraField {
  /** Nostr tag name to write, e.g. "studio", "spotify". */
  tag: string;
  label: string;
  placeholder?: string;
  /** "text" (default) | "url" | "toggle" */
  type?: 'text' | 'url' | 'toggle';
  helper?: string;
}

export interface CraftFormConfig {
  kind: number;
  selfTag: string;
  /** Fixed `d` identifier for this craft's single profile per user. */
  identifier: string;
  /** Page heading, e.g. "Become a Tattoo Artist". */
  heading: string;
  /** Sub-line under the heading. */
  tagline: string;
  /** Human noun for toasts / alt text, e.g. "tattoo artist". */
  noun: string;
  /** Tailwind text color for the accent, e.g. "text-rose-400". */
  accentText: string;
  /** Tailwind bg color for the accent, e.g. "bg-rose-600". */
  accentBg: string;
  /** Active-chip classes, e.g. "bg-rose-600 text-white border-rose-600". */
  accentChip: string;
  /** Hover classes for inactive chips. */
  accentChipHover: string;
  /** Icon component for the login-gate + header. */
  icon: React.ComponentType<{ className?: string }>;
  /** Tag chip sections. */
  skillSections: SkillSection[];
  /** Craft-specific freeform fields. */
  extraFields?: ExtraField[];
  /** Whether this craft can be a collective (default true). */
  allowCollective?: boolean;
  /** Whether to show the rate field (default true). */
  showRate?: boolean;
  /** Label for the rate field. */
  rateLabel?: string;
  /** Label for the portfolio field. */
  portfolioLabel?: string;
}

export function CraftProfileForm({ config }: { config: CraftFormConfig }) {
  const {
    kind, selfTag, identifier, heading, tagline, noun,
    accentText, accentBg, accentChip, accentChipHover, icon: Icon,
    skillSections, extraFields = [], allowCollective = true,
    showRate = true, rateLabel = 'Rate', portfolioLabel = 'Portfolio Link',
  } = config;

  const navigate = useNavigate();
  const { user } = useCurrentUser();
  const author = useAuthor(user?.pubkey || '');
  const { mutateAsync: createEvent, isPending } = useNostrPublish();
  const { mutateAsync: uploadFile, isPending: isUploading } = useUploadFile();
  const { toast } = useToast();

  const { isActive: isPro, featuredUntilSeconds } = usePlatformFee('labProfile');
  const [goPro, setGoPro] = useState(false);

  const [bio, setBio] = useState('');
  const [location, setLocation] = useState('');
  const [latitude, setLatitude] = useState('');
  const [longitude, setLongitude] = useState('');
  const [selected, setSelected] = useState<string[]>([]);
  const [image, setImage] = useState<string | null>(null);
  const [experience, setExperience] = useState('');
  const [rate, setRate] = useState('');
  const [phone, setPhone] = useState('');
  const [email, setEmail] = useState('');
  const [website, setWebsite] = useState('');
  const [portfolio, setPortfolio] = useState('');
  const [social, setSocial] = useState('');
  const [noffer, setNoffer] = useState('');
  const [entityType, setEntityType] = useState<EntityType>('individual');
  const [members, setMembers] = useState<string[]>([]);
  const [crewRef, setCrewRef] = useState<string | undefined>(undefined);
  const [extras, setExtras] = useState<Record<string, string>>({});
  const [isGettingLocation, setIsGettingLocation] = useState(false);

  const getDisplayName = () => {
    if (author.data?.metadata?.name) return author.data.metadata.name;
    if (user?.pubkey) {
      const npub = nip19.npubEncode(user.pubkey);
      return `${npub.slice(0, 12)}...${npub.slice(-4)}`;
    }
    return `Anonymous ${noun}`;
  };

  const toggle = (key: string) =>
    setSelected((prev) => (prev.includes(key) ? prev.filter((s) => s !== key) : [...prev, key]));

  const getCurrentLocation = () => {
    if (!navigator.geolocation) {
      toast({ title: 'Geolocation not supported', 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' });
      },
      (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 tags = await uploadFile(files[0]);
      const url = tags[0]?.[1];
      if (url) {
        setImage(url);
        toast({ title: 'Image uploaded' });
      }
    } catch (error) {
      toast({ title: 'Upload failed', description: error instanceof Error ? error.message : 'Failed', variant: 'destructive' });
    }
    e.target.value = '';
  };

  const requiredSections = skillSections.filter((s) => s.required);

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

    // Enforce required skill sections
    for (const section of requiredSections) {
      const keys = section.entries.map(([k]) => k);
      if (!selected.some((s) => keys.includes(s))) {
        toast({ title: `${section.title} required`, description: `Select at least one option under "${section.title}".`, variant: 'destructive' });
        return;
      }
    }

    try {
      const displayName = getDisplayName();
      const tags: string[][] = [
        ['d', identifier],
        ['title', displayName],
        ['t', selfTag],
        ['alt', `Skate ${noun}: ${displayName}`],
      ];

      if (location.trim()) tags.push(['location', location.trim()]);
      if (latitude && longitude) {
        const lat = parseFloat(latitude);
        const lng = parseFloat(longitude);
        if (!isNaN(lat) && !isNaN(lng)) tags.push(['g', ngeohash.encode(lat, lng, 7)]);
      }

      for (const s of selected) tags.push(['t', s]);

      if (image) tags.push(['image', image]);
      if (experience.trim()) tags.push(['experience', experience.trim()]);
      if (showRate && rate.trim()) tags.push(['rate', rate.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 (portfolio.trim()) tags.push(['portfolio', portfolio.trim()]);
      if (social.trim()) tags.push(['social', social.trim()]);
      if (isValidNoffer(noffer.trim())) tags.push(['noffer', noffer.trim().toLowerCase()]);

      // Craft-specific extras
      for (const f of extraFields) {
        const v = (extras[f.tag] ?? '').trim();
        if (f.type === 'toggle') {
          if (extras[f.tag] === 'true') tags.push([f.tag, 'true']);
        } else if (v) {
          if (f.type === 'url' && !/^https?:\/\//i.test(v)) continue;
          tags.push([f.tag, v]);
        }
      }

      tags.push(['entity', entityType]);
      if (allowCollective && entityType === 'collective') {
        for (const pk of members) tags.push(['p', pk]);
        if (crewRef) tags.push(['a', crewRef]);
      }

      if (isPro && goPro && featuredUntilSeconds) tags.push(['featured', String(featuredUntilSeconds)]);

      await createEvent({ kind, content: bio.trim(), tags });
      toast({ title: `${heading.replace(/^Become an?/, '').trim()} profile created!`, description: 'Your profile has been published.' });
      navigate(`/coach/${user?.pubkey}/${identifier}`);
    } catch (error) {
      toast({ title: 'Failed to publish', description: error instanceof Error ? error.message : 'Error', variant: 'destructive' });
    }
  };

  if (!user) {
    return (
      <Layout>
        <div className="container px-4 py-8">
          <Card className="max-w-xl mx-auto bg-gray-900 border-gray-700">
            <CardContent className="py-12 text-center">
              <Icon className={cn('h-12 w-12 mx-auto mb-4', accentText)} />
              <h2 className="text-xl font-bold mb-2">Login Required</h2>
              <p className="text-gray-400 mb-6">You need to log in to create a {noun} profile.</p>
              <LoginArea className="justify-center max-w-60 mx-auto" />
            </CardContent>
          </Card>
        </div>
      </Layout>
    );
  }

  const hasNip05 = user?.metadata?.nip05;
  const entityCoord = `${kind}:${user.pubkey}:${identifier}`;

  return (
    <Layout>
      <div className="container px-4 sm:px-6 py-6 sm:py-8 max-w-2xl">
        {/* Header */}
        <div className="mb-6">
          <Link to="/lab" className="inline-flex items-center text-gray-400 hover:text-white transition-colors mb-4">
            <ArrowLeft className="h-4 w-4 mr-2" />
            Back to The Lab
          </Link>
          <div className="flex items-center gap-3">
            <div className={cn('w-11 h-11 rounded-xl flex items-center justify-center', accentChip)}>
              <Icon className="h-6 w-6" />
            </div>
            <div>
              <h1 className={cn('text-2xl sm:text-3xl font-black uppercase leading-none', accentText)} style={{ fontFamily: 'Impact, "Arial Black", sans-serif' }}>
                {heading}
              </h1>
              <p className="text-gray-400 mt-1 text-sm">{tagline}</p>
            </div>
          </div>

          {!hasNip05 && (
            <Card className="mt-4 bg-yellow-950/30 border-2 border-yellow-500/50">
              <CardContent className="p-4">
                <div className="flex items-start gap-3">
                  <div className="text-yellow-500">⚠️</div>
                  <div>
                    <h3 className="font-bold text-yellow-400 mb-1">Add NIP-05 to build trust</h3>
                    <p className="text-sm text-gray-300 mb-2">
                      A NIP-05 identifier helps skaters verify you're the real deal. Highly recommended before listing.
                    </p>
                    <Link to="/settings">
                      <Button variant="outline" size="sm" className="border-yellow-500/50 hover:bg-yellow-500/10 text-yellow-400 font-bold">
                        Add NIP-05 in Settings
                      </Button>
                    </Link>
                  </div>
                </div>
              </CardContent>
            </Card>
          )}
        </div>

        <form onSubmit={handleSubmit} className="space-y-6">
          {/* Image + Bio */}
          <Card className="bg-black/60 border-white/10">
            <CardContent className="p-5 space-y-4">
              <div className="flex items-center gap-4">
                <div className={cn('relative w-20 h-20 rounded-2xl border-2 flex items-center justify-center overflow-hidden flex-shrink-0', image ? 'border-white/20' : 'border-dashed border-white/20')}>
                  {image ? (
                    <>
                      <img src={image} alt="Profile" className="w-full h-full object-cover" />
                      <button type="button" onClick={() => setImage(null)} className="absolute top-0.5 right-0.5 bg-black/70 rounded-full p-0.5">
                        <X className="h-3 w-3 text-white" />
                      </button>
                    </>
                  ) : (
                    <Icon className="h-7 w-7 text-gray-600" />
                  )}
                </div>
                <div className="flex-1">
                  <Label className="text-xs font-bold uppercase tracking-widest text-gray-400">Profile image</Label>
                  <label className={cn('mt-1.5 flex items-center gap-2 px-3 py-2 rounded-lg border border-white/10 bg-white/5 hover:bg-white/10 cursor-pointer text-sm w-fit transition-colors', isUploading && 'opacity-50 pointer-events-none')}>
                    {isUploading ? <Loader2 className="h-4 w-4 animate-spin" /> : <Upload className="h-4 w-4" />}
                    {isUploading ? 'Uploading…' : 'Upload'}
                    <input type="file" accept="image/*" className="hidden" onChange={handleImageUpload} disabled={isUploading} />
                  </label>
                </div>
              </div>

              <div>
                <Label htmlFor="bio" className="text-xs font-bold uppercase tracking-widest text-gray-400">About</Label>
                <Textarea
                  id="bio"
                  value={bio}
                  onChange={(e) => setBio(e.target.value)}
                  placeholder={`Tell skaters about your ${noun} work…`}
                  className="mt-1.5 bg-white/5 border-white/10 min-h-[100px] resize-none"
                  maxLength={3000}
                />
              </div>
            </CardContent>
          </Card>

          {/* Skill sections */}
          {skillSections.map((section) => (
            <Card key={section.title} className="bg-black/60 border-white/10">
              <CardContent className="p-5">
                <Label className="text-xs font-bold uppercase tracking-widest text-gray-400 flex items-center gap-2">
                  {section.title}
                  {section.required && <span className={cn('text-[10px]', accentText)}>• required</span>}
                </Label>
                <div className="mt-3 flex flex-wrap gap-2">
                  {section.entries.map(([key, label]) => {
                    const active = selected.includes(key);
                    return (
                      <button
                        key={key}
                        type="button"
                        onClick={() => toggle(key)}
                        className={cn(
                          'px-3 py-1.5 rounded-full text-xs font-bold border transition-all active:scale-95',
                          active ? accentChip : cn('bg-white/5 border-white/10 text-gray-400', accentChipHover)
                        )}
                      >
                        {label}
                      </button>
                    );
                  })}
                </div>
              </CardContent>
            </Card>
          ))}

          {/* Craft-specific extras */}
          {extraFields.length > 0 && (
            <Card className="bg-black/60 border-white/10">
              <CardContent className="p-5 space-y-4">
                {extraFields.map((f) => (
                  f.type === 'toggle' ? (
                    <div key={f.tag} className="flex items-center justify-between gap-3">
                      <div>
                        <Label className="text-sm font-bold text-gray-200">{f.label}</Label>
                        {f.helper && <p className="text-xs text-gray-500">{f.helper}</p>}
                      </div>
                      <Switch
                        checked={extras[f.tag] === 'true'}
                        onCheckedChange={(v) => setExtras((prev) => ({ ...prev, [f.tag]: v ? 'true' : 'false' }))}
                      />
                    </div>
                  ) : (
                    <div key={f.tag}>
                      <Label htmlFor={f.tag} className="text-xs font-bold uppercase tracking-widest text-gray-400">{f.label}</Label>
                      <Input
                        id={f.tag}
                        value={extras[f.tag] ?? ''}
                        onChange={(e) => setExtras((prev) => ({ ...prev, [f.tag]: e.target.value }))}
                        placeholder={f.placeholder}
                        inputMode={f.type === 'url' ? 'url' : undefined}
                        className="mt-1.5 bg-white/5 border-white/10"
                      />
                      {f.helper && <p className="text-xs text-gray-500 mt-1">{f.helper}</p>}
                    </div>
                  )
                ))}
              </CardContent>
            </Card>
          )}

          {/* Location + experience + rate */}
          <Card className="bg-black/60 border-white/10">
            <CardContent className="p-5 space-y-4">
              <div>
                <Label htmlFor="location" className="text-xs font-bold uppercase tracking-widest text-gray-400">Location</Label>
                <div className="mt-1.5 flex gap-2">
                  <Input id="location" value={location} onChange={(e) => setLocation(e.target.value)} placeholder="City, Country" className="bg-white/5 border-white/10" />
                  <Button type="button" variant="outline" onClick={getCurrentLocation} disabled={isGettingLocation} className="border-white/10 flex-shrink-0">
                    {isGettingLocation ? <Loader2 className="h-4 w-4 animate-spin" /> : <MapPin className="h-4 w-4" />}
                  </Button>
                </div>
                {latitude && longitude && <p className="text-xs text-green-400 mt-1">📍 Pinned to map ({latitude}, {longitude})</p>}
              </div>
              <div className={cn('grid gap-4', showRate ? 'grid-cols-2' : 'grid-cols-1')}>
                <div>
                  <Label htmlFor="exp" className="text-xs font-bold uppercase tracking-widest text-gray-400">Experience (years)</Label>
                  <Input id="exp" value={experience} onChange={(e) => setExperience(e.target.value)} placeholder="e.g. 5" inputMode="numeric" className="mt-1.5 bg-white/5 border-white/10" />
                </div>
                {showRate && (
                  <div>
                    <Label htmlFor="rate" className="text-xs font-bold uppercase tracking-widest text-gray-400">{rateLabel}</Label>
                    <Input id="rate" value={rate} onChange={(e) => setRate(e.target.value)} placeholder="e.g. 20k sats / by project" className="mt-1.5 bg-white/5 border-white/10" />
                  </div>
                )}
              </div>
            </CardContent>
          </Card>

          {/* Contact + links */}
          <Card className="bg-black/60 border-white/10">
            <CardContent className="p-5 space-y-4">
              <Label className="text-xs font-bold uppercase tracking-widest text-gray-400">Contact & Links</Label>
              <div className="grid grid-cols-1 sm:grid-cols-2 gap-3">
                <Input value={phone} onChange={(e) => setPhone(e.target.value)} placeholder="Phone (optional)" className="bg-white/5 border-white/10" />
                <Input value={email} onChange={(e) => setEmail(e.target.value)} placeholder="Email (optional)" type="email" className="bg-white/5 border-white/10" />
                <Input value={website} onChange={(e) => setWebsite(e.target.value)} placeholder="Website" inputMode="url" className="bg-white/5 border-white/10" />
                <Input value={social} onChange={(e) => setSocial(e.target.value)} placeholder="Social (Instagram, etc.)" className="bg-white/5 border-white/10" />
                <Input value={portfolio} onChange={(e) => setPortfolio(e.target.value)} placeholder={portfolioLabel} inputMode="url" className="bg-white/5 border-white/10 sm:col-span-2" />
              </div>
            </CardContent>
          </Card>

          {/* Payments — Lightning address (from profile) + optional CLINK code */}
          <Card className="bg-black/60 border-white/10">
            <CardContent className="p-5 space-y-4">
              <Label className="text-xs font-bold uppercase tracking-widest text-gray-400">
                Getting Paid
              </Label>
              <PaymentReadinessNote />
              <NofferField value={noffer} onChange={setNoffer} />
            </CardContent>
          </Card>

          {/* Entity type + crew link (collective-capable crafts) */}
          {allowCollective && (
            <Card className="bg-black/60 border-white/10">
              <CardContent className="p-5 space-y-4">
                <EntityTypeField
                  entityType={entityType}
                  onEntityTypeChange={setEntityType}
                  members={members}
                  onMembersChange={setMembers}
                  accentBg={accentBg}
                  accentText={accentText}
                />
                {entityType === 'collective' && (
                  <CrewLinkField value={crewRef} onChange={setCrewRef} accentText={accentText} accentBg={accentBg} />
                )}
              </CardContent>
            </Card>
          )}

          {/* Pro upgrade (optional) */}
          <LabProUpgrade enabled={goPro} onEnabledChange={setGoPro} accentText={accentText} entityCoord={entityCoord} />

          {/* Submit */}
          <Button
            type="submit"
            disabled={isPending}
            className={cn('w-full h-12 rounded-xl font-black text-base uppercase tracking-wide', accentChip)}
          >
            {isPending ? <Loader2 className="h-5 w-5 animate-spin" /> : 'Publish Profile'}
          </Button>
        </form>
      </div>
    </Layout>
  );
}