"use client";

import { useState, useCallback } from "react";
import Image from "next/image";
import { Button } from "@/components/ui/button";
import { Card, CardContent } from "@/components/ui/card";
import { Input } from "@/components/ui/input";
import { Badge } from "@/components/ui/badge";
import { 
  Upload, FileText, ShieldCheck, Download, Trash2, AlertCircle, X, Zap, Lock, Shield, Clock,
  User, AtSign, MapPin, Cake, Home as HomeIcon, Venus, Phone, Building, Fingerprint, CreditCard, Check
} from "lucide-react";

// Interfaces et Données
interface ProcessedFile {
  id: string; name: string; status: 'processing' | 'completed' | 'error';
  timestamp: Date; originalSize?: string; processedSize?: string;
  piiCount?: number; errorMessage?: string; processedBlob?: Blob;
}

interface AnonymizationOptions { [key: string]: boolean; }

const piiOptions = [
  { id: 'name', label: 'Nom & Prénom', icon: User },
  { id: 'email', label: 'Email', icon: AtSign },
  { id: 'location', label: 'Lieu', icon: MapPin },
  { id: 'birthdate', label: 'Date de naissance', icon: Cake },
  { id: 'address', label: 'Adresse', icon: HomeIcon },
  { id: 'gender', label: 'Genre / Sexe', icon: Venus },
  { id: 'phone', label: 'Téléphone', icon: Phone },
  { id: 'organization', label: 'Entreprise', icon: Building },
  { id: 'idNumber', label: 'N° Identification', icon: Fingerprint },
  { id: 'financial', label: 'Données financières', icon: CreditCard },
];

export default function Home() {
  // === Déclaration des états (States) ===
  const [file, setFile] = useState<File | null>(null);
  const [isProcessing, setIsProcessing] = useState(false);
  const [progress, setProgress] = useState(0);
  const [isDragOver, setIsDragOver] = useState(false);
  const [history, setHistory] = useState<ProcessedFile[]>([]);
  const [error, setError] = useState<string | null>(null);
  const [anonymizationOptions, setAnonymizationOptions] = useState<AnonymizationOptions>(
    piiOptions.reduce((acc, option) => ({ ...acc, [option.id]: true }), {})
  );

  // === Fonctions utilitaires et Handlers ===
  const handleOptionChange = (id: string) => setAnonymizationOptions(prev => ({ ...prev, [id]: !prev[id] }));
  const handleFileChange = (event: React.ChangeEvent<HTMLInputElement>) => { if (event.target.files?.length) { setFile(event.target.files[0]); setError(null); }};
  const handleDrop = useCallback((e: React.DragEvent) => { e.preventDefault(); setIsDragOver(false); if (e.dataTransfer.files?.length) { setFile(e.dataTransfer.files[0]); setError(null); }}, []);
  const handleDragOver = useCallback((e: React.DragEvent) => { e.preventDefault(); setIsDragOver(true); }, []);
  const handleDragLeave = useCallback((e: React.DragEvent) => { e.preventDefault(); setIsDragOver(false); }, []);
  const formatFileSize = (bytes: number): string => { if (bytes === 0) return '0 Bytes'; const k = 1024; const sizes = ['Bytes', 'KB', 'MB', 'GB']; const i = Math.floor(Math.log(bytes) / Math.log(k)); return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i]; };
  const clearFile = () => { setFile(null); setError(null); };
  const clearHistory = () => setHistory([]);
  const removeFromHistory = (id: string) => setHistory(prev => prev.filter(item => item.id !== id));
  const handleDownload = (id: string) => { const fileToDownload = history.find(item => item.id === id); if (!fileToDownload?.processedBlob) return; const url = URL.createObjectURL(fileToDownload.processedBlob); const a = document.createElement('a'); a.href = url; a.download = `anonymized_${fileToDownload.name.split('.')[0] || 'file'}.txt`; a.click(); URL.revokeObjectURL(url); a.remove(); };
  const getStatusInfo = (item: ProcessedFile) => { switch (item.status) { case 'completed': return { icon: <ShieldCheck className="h-4 w-4 text-white" />, color: 'bg-[#061717]' }; case 'error': return { icon: <AlertCircle className="h-4 w-4 text-white" />, color: 'bg-[#F7AB6E]' }; default: return { icon: <div className="h-2 w-2 rounded-full bg-[#F7AB6E] animate-pulse" />, color: 'bg-[#061717]' }; } };

  // === Fonction principale pour l'appel à n8n ===
  const processFile = async () => {
    if (!file) return;
    const n8nWebhookUrl = process.env.NEXT_PUBLIC_N8N_WEBHOOK_URL;
    if (!n8nWebhookUrl) {
      setError("L'URL du service est manquante. Contactez l'administrateur.");
      return;
    }

    setIsProcessing(true); setProgress(0); setError(null);
    const fileId = `${Date.now()}-${file.name}`;
    setHistory(prev => [{ id: fileId, name: file.name, status: 'processing', timestamp: new Date(), originalSize: formatFileSize(file.size) }, ...prev]);
    setFile(null);
    setProgress(10);

    try {
      const formData = new FormData();
      // On attache le fichier binaire
      formData.append('file', file);
      // On attache les options cochées sous forme de chaîne JSON
      formData.append('options', JSON.stringify(anonymizationOptions));
      
      setProgress(30);
      const response = await fetch(n8nWebhookUrl, { method: 'POST', body: formData });
      setProgress(70);

      if (!response.ok) {
        const errorResult = await response.json().catch(() => ({ error: `Erreur serveur [${response.status}]` }));
        throw new Error(errorResult.error || `Échec du traitement.`);
      }

      const processedBlob = await response.blob();
      const piiCount = parseInt(response.headers.get('X-Pii-Count') || '0', 10);
      setProgress(90);
      
      setHistory(prev => prev.map(item => item.id === fileId ? { ...item, status: 'completed', processedSize: formatFileSize(processedBlob.size), piiCount, processedBlob } : item));
      setProgress(100);

    } catch (err) {
      const errorMessage = err instanceof Error ? err.message : "Une erreur inconnue est survenue.";
      setError(errorMessage);
      setHistory(prev => prev.map(item => item.id === fileId ? { ...item, status: 'error', errorMessage } : item));
    } finally {
      setIsProcessing(false); setTimeout(() => setProgress(0), 1000);
    }
  };

  // === Rendu du composant (JSX) ===
  return (
    <div className="h-screen w-screen bg-[#061717] flex flex-col md:flex-row overflow-hidden">
      {/* --- Sidebar (Historique) --- */}
      <aside className="w-full md:w-80 md:flex-shrink-0 bg-[#061717] border-b-4 md:border-b-0 md:border-r-4 border-white flex flex-col shadow-[4px_0_0_0_black]">
        <div className="p-4 border-b-4 border-white bg-[#F7AB6E] shadow-[0_4px_0_0_black] flex items-center justify-between">
          <div className="flex items-center gap-3">
            <Image src="/logo.svg" alt="LeCercle.IA Logo" width={32} height={32} />
            <h2 className="text-lg font-black text-white uppercase tracking-wide">Historique</h2>
          </div>
          {history.length > 0 && <Button onClick={clearHistory} variant="ghost" size="icon" className="bg-[#061717] text-white border-2 border-white shadow-[3px_3px_0_0_black] hover:shadow-[1px_1px_0_0_black] active:shadow-none active:translate-x-0.5 active:translate-y-0.5"><Trash2 className="h-4 w-4" /></Button>}
        </div>
        <div className="flex-1 overflow-y-auto p-3 space-y-3">
          {history.length === 0 ? (
            <div className="text-center py-10 px-4 flex flex-col justify-center h-full">
              <div className="w-14 h-14 bg-[#F7AB6E] border-4 border-white shadow-[6px_6px_0_0_black] mx-auto mb-4 flex items-center justify-center"><FileText className="h-7 w-7 text-white" /></div>
              <p className="text-white font-black text-base uppercase">Aucun Document</p>
              <p className="text-white/70 font-bold mt-1 text-xs">Vos fichiers apparaîtront ici.</p>
            </div>
          ) : (
            history.map((item) => {
              const status = getStatusInfo(item);
              return (<div key={item.id} className="bg-[#061717] border-2 border-white shadow-[4px_4px_0_0_black] p-3 transition-all"><div className="flex items-start justify-between"><div className="flex items-center gap-3 min-w-0"><div className={`flex-shrink-0 w-7 h-7 border-2 border-white shadow-[2px_2px_0_0_black] flex items-center justify-center ${status.color}`}>{status.icon}</div><div className="min-w-0"><p className="text-sm font-black text-white uppercase truncate" title={item.name}>{item.name}</p>{item.status === 'completed' && (<div className="flex items-center gap-2 mt-1"><span className="text-xs font-bold text-white/70">{item.originalSize} → {item.processedSize}</span><Badge className="bg-[#F7AB6E] text-white border-2 border-white shadow-[2px_2px_0_0_black] font-black uppercase text-[10px] px-1.5 py-0">{item.piiCount} PII</Badge></div>)}{item.status === 'error' && <p className="text-xs font-bold text-[#F7AB6E] mt-1 uppercase">Erreur</p>}{item.status === 'processing' && <p className="text-xs font-bold text-[#F7AB6E] mt-1 uppercase">Traitement...</p>}</div></div><div className="flex items-center gap-1.5 ml-2">{item.status === 'completed' && (<Button onClick={() => handleDownload(item.id)} variant="ghost" size="icon" className="h-7 w-7 bg-[#061717] text-white border-2 border-white shadow-[2px_2px_0_0_black] hover:shadow-[1px_1px_0_0_black] active:shadow-none active:translate-x-0.5 active:translate-y-0.5"><Download className="h-3 w-3" /></Button>)}<Button onClick={() => removeFromHistory(item.id)} variant="ghost" size="icon" className="h-7 w-7 bg-[#F7AB6E] text-white border-2 border-white shadow-[2px_2px_0_0_black] hover:shadow-[1px_1px_0_0_black] active:shadow-none active:translate-x-0.5 active:translate-y-0.5"><X className="h-3 w-3" /></Button></div></div></div>);
            })
          )}
        </div>
      </aside>

      {/* --- Contenu Principal --- */}
      <main className="flex-1 flex flex-col items-center justify-center p-4 md:p-6 bg-[#061717] overflow-y-auto">
        <div className="w-full max-w-xl flex flex-col h-full">
          <header className="text-center pt-4">
            <div className="inline-block p-2 bg-[#F7AB6E] border-2 border-white shadow-[6px_6px_0_0_black] mb-3"><Lock className="h-8 w-8 text-white" /></div>
            <h1 className="text-3xl md:text-4xl font-black text-white uppercase tracking-tighter mb-1">LeCercle.IA</h1>
            <p className="text-base md:text-lg font-bold text-white/90 uppercase tracking-wider">Anonymisation • RGPD • Sécurisé</p>
          </header>
          <Card className="flex-grow my-4 bg-[#061717] border-4 border-white shadow-[10px_10px_0_0_black] flex flex-col">
            <CardContent className="p-4 md:p-6 space-y-4 flex-grow flex flex-col">
              <div onDrop={handleDrop} onDragOver={handleDragOver} onDragLeave={handleDragLeave} className={`relative border-4 border-dashed p-6 text-center transition-all duration-200 ${isDragOver ? 'border-[#F7AB6E] bg-white/5' : file ? 'border-[#F7AB6E] bg-white/5 border-solid' : 'border-white hover:border-[#F7AB6E] hover:bg-white/5'}`}>
                <Input type="file" onChange={handleFileChange} className="absolute inset-0 w-full h-full opacity-0 cursor-pointer" accept=".txt,.json,.csv,.pdf,.docx" />
                <div className="flex flex-col items-center justify-center space-y-4">
                  <div className={`w-14 h-14 border-4 border-white shadow-[5px_5px_0_0_black] flex items-center justify-center transition-all duration-200 ${file ? 'bg-[#F7AB6E]' : 'bg-[#061717]'}`}>{file ? <FileText className="h-7 w-7 text-white" /> : <Upload className="h-7 w-7 text-white" />}</div>
                  {file ? (<div><p className="text-base font-black text-white uppercase">{file.name}</p><p className="text-sm font-bold text-white/70">{formatFileSize(file.size)}</p></div>) : (<div><p className="text-lg font-black text-white uppercase tracking-wide">Glissez votre document</p><p className="text-base font-bold text-white/70 uppercase mt-1">Ou cliquez ici</p></div>)}
                </div>
              </div>
              <div className="flex-grow">
                <h3 className="text-base font-black text-white uppercase tracking-wide mb-3">Options d&apos;Anonymisation</h3>
                <div className="grid grid-cols-2 lg:grid-cols-2 gap-x-4 gap-y-2">
                  {piiOptions.map((option) => (<label key={option.id} htmlFor={option.id} className="flex items-center gap-2 cursor-pointer group"><input type="checkbox" id={option.id} className="sr-only peer" checked={anonymizationOptions[option.id]} onChange={() => handleOptionChange(option.id)} /><div className="w-5 h-5 border-2 border-white shadow-[2px_2px_0_0_black] flex items-center justify-center transition-all peer-checked:bg-[#F7AB6E] peer-checked:border-[#F7AB6E]">{anonymizationOptions[option.id] && <Check className="h-4 w-4 text-white" />}</div><span className="font-bold text-xs text-white uppercase">{option.label}</span></label>))}
                </div>
              </div>
              {isProcessing && (<div className="space-y-2"><div className="flex justify-between items-center"><span className="text-base font-black text-white uppercase">Traitement...</span><span className="text-lg font-black text-[#F7AB6E]">{Math.round(progress)}%</span></div><div className="h-4 bg-[#061717] border-2 border-white shadow-[3px_3px_0_0_black]"><div className="h-full bg-[#F7AB6E] transition-all duration-300" style={{ width: `${progress}%` }} /></div></div>)}
              {error && (<div className="flex items-start gap-3 p-3 bg-[#F7AB6E] border-2 border-white shadow-[4px_4px_0_0_black]"><AlertCircle className="h-5 w-5 text-white flex-shrink-0 mt-0.5" /><p className="text-sm font-bold text-white uppercase">{error}</p></div>)}
              <div className="flex items-stretch gap-3 pt-2">
                <Button onClick={processFile} disabled={!file || isProcessing} className="flex-1 bg-[#F7AB6E] text-white border-4 border-white shadow-[6px_6px_0_0_black] hover:shadow-[3px_3px_0_0_black] active:shadow-none active:translate-x-1 active:translate-y-1 h-12 text-base font-black uppercase tracking-wide disabled:opacity-50">{isProcessing ? <div className="animate-spin rounded-full h-6 w-6 border-4 border-white border-t-transparent" /> : <><Zap className="h-5 w-5 mr-2" />Anonymiser</>}</Button>
                {file && !isProcessing && <Button onClick={clearFile} className="h-12 w-12 p-0 bg-[#061717] text-white border-4 border-white shadow-[6px_6px_0_0_black] hover:shadow-[3px_3px_0_0_black] active:shadow-none active:translate-x-1 active:translate-y-1"><X className="h-6 w-6" /></Button>}
              </div>
            </CardContent>
          </Card>
          <div className="grid grid-cols-3 gap-3 pb-4">
            {[{ icon: Shield, title: "RGPD", subtitle: "Conforme" }, { icon: Clock, title: "Rapide", subtitle: "Local" }, { icon: Lock, title: "Sécurisé", subtitle: "Sans Serveur" }].map((item, index) => (<div key={index} className="bg-[#061717] border-2 border-white shadow-[4px_4px_0_0_black] p-3 text-center"><div className="w-8 h-8 bg-[#F7AB6E] border-2 border-white shadow-[2px_2px_0_0_black] mx-auto mb-2 flex items-center justify-center"><item.icon className="h-4 w-4 text-white" /></div><p className="text-sm font-black text-white uppercase">{item.title}</p><p className="text-xs font-bold text-white/70 uppercase">{item.subtitle}</p></div>))}
          </div>
        </div>
      </main>
    </div>
  );
}