'use client';

import { useState } from 'react';
import { Plus, Pencil, Trash2, Search, PenTool, Stamp, Type, History, AlertTriangle } from 'lucide-react';
import { Button } from '@/shared/components/ui/button';
import { Input } from '@/shared/components/ui/input';
import { Label } from '@/shared/components/ui/label';
import { Textarea } from '@/shared/components/ui/textarea';
import { Badge } from '@/shared/components/ui/badge';
import { Card, CardContent, CardHeader, CardTitle } from '@/shared/components/ui/card';
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/shared/components/ui/select';
import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogFooter } from '@/shared/components/ui/dialog';
import type { CompanyId } from '@/core/auth/types';
import type { SignatureAsset, SignatureAssetType } from '../types';
import { useSignatures } from '../hooks/use-signatures';

const TYPE_LABELS: Record<SignatureAssetType, string> = {
  signature: 'Semnătură', stamp: 'Ștampilă', initials: 'Inițiale',
};

const TYPE_ICONS: Record<SignatureAssetType, typeof PenTool> = {
  signature: PenTool, stamp: Stamp, initials: Type,
};

type ViewMode = 'list' | 'add' | 'edit';

export function DigitalSignaturesModule() {
  const { assets, allAssets, loading, filters, updateFilter, addAsset, updateAsset, addVersion, removeAsset } = useSignatures();
  const [viewMode, setViewMode] = useState<ViewMode>('list');
  const [editingAsset, setEditingAsset] = useState<SignatureAsset | null>(null);
  const [deletingId, setDeletingId] = useState<string | null>(null);
  const [versionAsset, setVersionAsset] = useState<SignatureAsset | null>(null);

  const handleSubmit = async (data: Omit<SignatureAsset, 'id' | 'createdAt' | 'updatedAt'>) => {
    if (viewMode === 'edit' && editingAsset) {
      await updateAsset(editingAsset.id, data);
    } else {
      await addAsset(data);
    }
    setViewMode('list');
    setEditingAsset(null);
  };

  const handleDeleteConfirm = async () => {
    if (deletingId) {
      await removeAsset(deletingId);
      setDeletingId(null);
    }
  };

  const handleAddVersion = async (imageUrl: string, notes: string) => {
    if (versionAsset) {
      await addVersion(versionAsset.id, imageUrl, notes);
      setVersionAsset(null);
    }
  };

  const isExpiringSoon = (date?: string) => {
    if (!date) return false;
    const diff = new Date(date).getTime() - Date.now();
    return diff > 0 && diff < 30 * 24 * 60 * 60 * 1000; // 30 days
  };

  const isExpired = (date?: string) => {
    if (!date) return false;
    return new Date(date).getTime() < Date.now();
  };

  return (
    <div className="space-y-6">
      {/* Stats */}
      <div className="grid grid-cols-2 gap-3 sm:grid-cols-4">
        <Card><CardContent className="p-4"><p className="text-xs text-muted-foreground">Total</p><p className="text-2xl font-bold">{allAssets.length}</p></CardContent></Card>
        {(Object.keys(TYPE_LABELS) as SignatureAssetType[]).map((type) => (
          <Card key={type}><CardContent className="p-4">
            <p className="text-xs text-muted-foreground">{TYPE_LABELS[type]}</p>
            <p className="text-2xl font-bold">{allAssets.filter((a) => a.type === type).length}</p>
          </CardContent></Card>
        ))}
      </div>

      {viewMode === 'list' && (
        <>
          <div className="flex flex-wrap items-center gap-3">
            <div className="relative min-w-[200px] flex-1">
              <Search className="absolute left-2.5 top-2.5 h-4 w-4 text-muted-foreground" />
              <Input placeholder="Caută..." value={filters.search} onChange={(e) => updateFilter('search', e.target.value)} className="pl-9" />
            </div>
            <Select value={filters.type} onValueChange={(v) => updateFilter('type', v as SignatureAssetType | 'all')}>
              <SelectTrigger className="w-[150px]"><SelectValue /></SelectTrigger>
              <SelectContent>
                <SelectItem value="all">Toate tipurile</SelectItem>
                {(Object.keys(TYPE_LABELS) as SignatureAssetType[]).map((t) => (
                  <SelectItem key={t} value={t}>{TYPE_LABELS[t]}</SelectItem>
                ))}
              </SelectContent>
            </Select>
            <Button onClick={() => setViewMode('add')} className="shrink-0">
              <Plus className="mr-1.5 h-4 w-4" /> Adaugă
            </Button>
          </div>

          {loading ? (
            <p className="py-8 text-center text-sm text-muted-foreground">Se încarcă...</p>
          ) : assets.length === 0 ? (
            <p className="py-8 text-center text-sm text-muted-foreground">Niciun element găsit. Adaugă o semnătură, ștampilă sau inițiale.</p>
          ) : (
            <div className="grid gap-3 sm:grid-cols-2 lg:grid-cols-3">
              {assets.map((asset) => {
                const Icon = TYPE_ICONS[asset.type];
                const expired = isExpired(asset.expirationDate);
                const expiringSoon = isExpiringSoon(asset.expirationDate);
                return (
                  <Card key={asset.id} className={`group relative ${expired ? 'border-destructive/50' : expiringSoon ? 'border-yellow-500/50' : ''}`}>
                    <CardContent className="p-4">
                      <div className="absolute right-2 top-2 flex gap-1 opacity-0 transition-opacity group-hover:opacity-100">
                        <Button variant="ghost" size="icon" className="h-7 w-7" title="Versiune nouă" onClick={() => setVersionAsset(asset)}>
                          <History className="h-3.5 w-3.5" />
                        </Button>
                        <Button variant="ghost" size="icon" className="h-7 w-7" onClick={() => { setEditingAsset(asset); setViewMode('edit'); }}>
                          <Pencil className="h-3.5 w-3.5" />
                        </Button>
                        <Button variant="ghost" size="icon" className="h-7 w-7 text-destructive" onClick={() => setDeletingId(asset.id)}>
                          <Trash2 className="h-3.5 w-3.5" />
                        </Button>
                      </div>
                      <div className="flex items-center gap-3">
                        <div className="flex h-12 w-12 items-center justify-center rounded-lg border bg-muted/30">
                          {asset.imageUrl ? (
                            // eslint-disable-next-line @next/next/no-img-element
                            <img src={asset.imageUrl} alt={asset.label} className="max-h-10 max-w-10 object-contain" />
                          ) : (
                            <Icon className="h-6 w-6 text-muted-foreground" />
                          )}
                        </div>
                        <div className="min-w-0 flex-1">
                          <p className="font-medium">{asset.label}</p>
                          <div className="flex flex-wrap items-center gap-1">
                            <Badge variant="outline" className="text-[10px]">{TYPE_LABELS[asset.type]}</Badge>
                            <span className="text-xs text-muted-foreground">{asset.owner}</span>
                          </div>
                        </div>
                      </div>
                      {/* Metadata row */}
                      <div className="mt-2 space-y-1">
                        {asset.legalStatus && (
                          <p className="text-xs text-muted-foreground">Status legal: {asset.legalStatus}</p>
                        )}
                        {asset.expirationDate && (
                          <div className="flex items-center gap-1 text-xs">
                            {(expired || expiringSoon) && <AlertTriangle className="h-3 w-3 text-yellow-500" />}
                            <span className={expired ? 'text-destructive font-medium' : expiringSoon ? 'text-yellow-600 font-medium' : 'text-muted-foreground'}>
                              {expired ? 'Expirat' : expiringSoon ? 'Expiră curând' : 'Expiră'}: {asset.expirationDate}
                            </span>
                          </div>
                        )}
                        {asset.usageNotes && (
                          <p className="text-xs text-muted-foreground line-clamp-1">Note: {asset.usageNotes}</p>
                        )}
                        {asset.versions.length > 0 && (
                          <p className="text-xs text-muted-foreground">Versiuni: {asset.versions.length + 1}</p>
                        )}
                      </div>
                    </CardContent>
                  </Card>
                );
              })}
            </div>
          )}
        </>
      )}

      {(viewMode === 'add' || viewMode === 'edit') && (
        <Card>
          <CardHeader><CardTitle>{viewMode === 'edit' ? 'Editare' : 'Element nou'}</CardTitle></CardHeader>
          <CardContent>
            <AssetForm initial={editingAsset ?? undefined} onSubmit={handleSubmit} onCancel={() => { setViewMode('list'); setEditingAsset(null); }} />
          </CardContent>
        </Card>
      )}

      {/* Delete confirmation */}
      <Dialog open={deletingId !== null} onOpenChange={(open) => { if (!open) setDeletingId(null); }}>
        <DialogContent>
          <DialogHeader><DialogTitle>Confirmare ștergere</DialogTitle></DialogHeader>
          <p className="text-sm">Ești sigur că vrei să ștergi acest element? Acțiunea este ireversibilă.</p>
          <DialogFooter>
            <Button variant="outline" onClick={() => setDeletingId(null)}>Anulează</Button>
            <Button variant="destructive" onClick={handleDeleteConfirm}>Șterge</Button>
          </DialogFooter>
        </DialogContent>
      </Dialog>

      {/* Add version dialog */}
      <Dialog open={versionAsset !== null} onOpenChange={(open) => { if (!open) setVersionAsset(null); }}>
        <DialogContent>
          <DialogHeader><DialogTitle>Versiune nouă — {versionAsset?.label}</DialogTitle></DialogHeader>
          <AddVersionForm
            onSubmit={handleAddVersion}
            onCancel={() => setVersionAsset(null)}
            history={versionAsset?.versions ?? []}
          />
        </DialogContent>
      </Dialog>
    </div>
  );
}

function AddVersionForm({ onSubmit, onCancel, history }: {
  onSubmit: (imageUrl: string, notes: string) => void;
  onCancel: () => void;
  history: Array<{ id: string; imageUrl: string; notes: string; createdAt: string }>;
}) {
  const [imageUrl, setImageUrl] = useState('');
  const [notes, setNotes] = useState('');

  return (
    <div className="space-y-4">
      {history.length > 0 && (
        <div className="max-h-32 space-y-1 overflow-y-auto rounded border p-2">
          <p className="text-xs font-medium text-muted-foreground">Istoric versiuni</p>
          {history.map((v) => (
            <div key={v.id} className="flex items-center justify-between text-xs">
              <span className="truncate text-muted-foreground">{v.notes || 'Fără note'}</span>
              <span className="shrink-0 text-muted-foreground">{v.createdAt.slice(0, 10)}</span>
            </div>
          ))}
        </div>
      )}
      <div>
        <Label>URL imagine nouă</Label>
        <Input value={imageUrl} onChange={(e) => setImageUrl(e.target.value)} className="mt-1" placeholder="https://... sau data:image/png;base64,..." required />
      </div>
      <div>
        <Label>Note versiune</Label>
        <Input value={notes} onChange={(e) => setNotes(e.target.value)} className="mt-1" placeholder="Ce s-a schimbat..." />
      </div>
      <div className="flex justify-end gap-2">
        <Button variant="outline" onClick={onCancel}>Anulează</Button>
        <Button onClick={() => { if (imageUrl.trim()) onSubmit(imageUrl, notes); }} disabled={!imageUrl.trim()}>Salvează versiune</Button>
      </div>
    </div>
  );
}

function AssetForm({ initial, onSubmit, onCancel }: {
  initial?: SignatureAsset;
  onSubmit: (data: Omit<SignatureAsset, 'id' | 'createdAt' | 'updatedAt'>) => void;
  onCancel: () => void;
}) {
  const [label, setLabel] = useState(initial?.label ?? '');
  const [type, setType] = useState<SignatureAssetType>(initial?.type ?? 'signature');
  const [imageUrl, setImageUrl] = useState(initial?.imageUrl ?? '');
  const [owner, setOwner] = useState(initial?.owner ?? '');
  const [company, setCompany] = useState<CompanyId>(initial?.company ?? 'beletage');
  const [expirationDate, setExpirationDate] = useState(initial?.expirationDate ?? '');
  const [legalStatus, setLegalStatus] = useState(initial?.legalStatus ?? '');
  const [usageNotes, setUsageNotes] = useState(initial?.usageNotes ?? '');

  return (
    <form onSubmit={(e) => {
      e.preventDefault();
      onSubmit({
        label, type, imageUrl, owner, company,
        expirationDate: expirationDate || undefined,
        legalStatus, usageNotes,
        versions: initial?.versions ?? [],
        tags: initial?.tags ?? [], visibility: initial?.visibility ?? 'all',
      });
    }} className="space-y-4">
      <div className="grid gap-4 sm:grid-cols-2">
        <div><Label>Denumire *</Label><Input value={label} onChange={(e) => setLabel(e.target.value)} className="mt-1" required /></div>
        <div><Label>Tip</Label>
          <Select value={type} onValueChange={(v) => setType(v as SignatureAssetType)}>
            <SelectTrigger className="mt-1"><SelectValue /></SelectTrigger>
            <SelectContent>
              <SelectItem value="signature">Semnătură</SelectItem>
              <SelectItem value="stamp">Ștampilă</SelectItem>
              <SelectItem value="initials">Inițiale</SelectItem>
            </SelectContent>
          </Select>
        </div>
      </div>
      <div className="grid gap-4 sm:grid-cols-2">
        <div><Label>Proprietar</Label><Input value={owner} onChange={(e) => setOwner(e.target.value)} className="mt-1" /></div>
        <div><Label>Companie</Label>
          <Select value={company} onValueChange={(v) => setCompany(v as CompanyId)}>
            <SelectTrigger className="mt-1"><SelectValue /></SelectTrigger>
            <SelectContent>
              <SelectItem value="beletage">Beletage</SelectItem>
              <SelectItem value="urban-switch">Urban Switch</SelectItem>
              <SelectItem value="studii-de-teren">Studii de Teren</SelectItem>
              <SelectItem value="group">Grup</SelectItem>
            </SelectContent>
          </Select>
        </div>
      </div>
      <div>
        <Label>URL imagine</Label>
        <Input value={imageUrl} onChange={(e) => setImageUrl(e.target.value)} className="mt-1" placeholder="https://... sau data:image/png;base64,..." />
        <p className="mt-1 text-xs text-muted-foreground">URL către imaginea semnăturii/ștampilei. Suportă URL-uri externe sau base64.</p>
      </div>
      <div className="grid gap-4 sm:grid-cols-3">
        <div><Label>Data expirare</Label><Input type="date" value={expirationDate} onChange={(e) => setExpirationDate(e.target.value)} className="mt-1" /></div>
        <div><Label>Status legal</Label><Input value={legalStatus} onChange={(e) => setLegalStatus(e.target.value)} className="mt-1" placeholder="Valid, Anulat..." /></div>
        <div><Label>Note utilizare</Label><Input value={usageNotes} onChange={(e) => setUsageNotes(e.target.value)} className="mt-1" placeholder="Doar pentru contracte..." /></div>
      </div>
      <div className="flex justify-end gap-2 pt-2">
        <Button type="button" variant="outline" onClick={onCancel}>Anulează</Button>
        <Button type="submit">{initial ? 'Actualizează' : 'Adaugă'}</Button>
      </div>
    </form>
  );
}