'use client';

import { useState, useEffect } from 'react';
import { useSearchParams } from 'next/navigation';
import Link from 'next/link';

interface Email {
  key: string;
  subject: string;
  date: string;
  processed: string;
  processedAt: string | null;
  processedBy: string | null;
  queuedTo: string | null;
  status: string | null;
}

export default function Emails() {
  const searchParams = useSearchParams();
  const bucket = searchParams.get('bucket');
  const mailbox = searchParams.get('mailbox');
  const [emails, setEmails] = useState<Email[]>([]);
  const [error, setError] = useState<string | null>(null);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    if (!bucket || !mailbox) {
      setError('Missing parameters');
      setLoading(false);
      return;
    }
    const auth = localStorage.getItem('auth');
    if (!auth) {
      setError('Not authenticated');
      setLoading(false);
      return;
    }

    fetch(`/api/emails?bucket=${bucket}&mailbox=${encodeURIComponent(mailbox)}`, { 
      headers: { Authorization: `Basic ${auth}` } 
    })
      .then(res => {
        if (!res.ok) throw new Error('Failed to fetch emails');
        return res.json();
      })
      .then(data => {
        const sorted = data.sort((a: Email, b: Email) => new Date(b.date).getTime() - new Date(a.date).getTime());
        setEmails(sorted);
      })
      .catch(err => setError(err.message))
      .finally(() => setLoading(false));
  }, [bucket, mailbox]);

  if (loading) return <div className="min-h-screen flex items-center justify-center bg-gray-50">Loading...</div>;
  if (error) return <div className="min-h-screen flex items-center justify-center bg-gray-50 text-red-500">{error}</div>;

  const formatDate = (dateStr: string | null) => {
    if (!dateStr) return '';
    const date = new Date(dateStr);
    return date.toLocaleString('en-US', { month: '2-digit', day: '2-digit', hour: '2-digit', minute: '2-digit', hour12: false });
  };

  return (
    <div className="min-h-screen bg-gray-50 p-4">
      <nav className="w-full mb-6 bg-white p-3 rounded shadow-sm border border-gray-100">
        <ol className="flex flex-wrap space-x-2 text-sm text-gray-500">
          <li><Link href="/" className="hover:text-blue-600">Home</Link></li>
          <li className="mx-1">/</li>
          <li><Link href={`/mailboxes?bucket=${bucket}`} className="hover:text-blue-600">Mailboxes</Link></li>
          <li className="mx-1">/</li>
          <li className="font-semibold text-gray-700">Emails</li>
        </ol>
      </nav>
      
      <h1 className="text-2xl font-bold mb-6 text-gray-800 break-all">
        {mailbox} <span className="text-gray-400 font-normal text-lg">in {bucket}</span>
      </h1>
      
      <div className="w-full bg-white rounded shadow-sm border border-gray-200 overflow-hidden">
        <div className="overflow-x-auto">
          <table className="w-full text-left border-collapse">
            <thead className="bg-gray-100 border-b border-gray-200">
              <tr>
                {/* SUBJECT: Bekommt keine Breite, damit es den Rest nimmt */}
                <th className="py-3 px-3 text-xs font-semibold text-gray-600 uppercase tracking-wider">
                  Subject
                </th>
                
                {/* ALLE ANDEREN: w-px + whitespace-nowrap sorgt für "Fit to Content" */}
                <th className="py-3 px-3 text-xs font-semibold text-gray-600 uppercase tracking-wider whitespace-nowrap w-px">
                  Date
                </th>
                <th className="py-3 px-3 text-xs font-semibold text-gray-600 uppercase tracking-wider whitespace-nowrap w-px">
                  Key
                </th>
                <th className="py-3 px-3 text-center text-xs font-semibold text-gray-600 uppercase tracking-wider whitespace-nowrap w-px">
                  Proc.
                </th>
                <th className="py-3 px-3 text-xs font-semibold text-gray-600 uppercase tracking-wider whitespace-nowrap w-px">
                  Proc. By
                </th>
                <th className="py-3 px-3 text-xs font-semibold text-gray-600 uppercase tracking-wider whitespace-nowrap w-px">
                  Queued
                </th>
                <th className="py-3 px-3 text-xs font-semibold text-gray-600 uppercase tracking-wider whitespace-nowrap w-px">
                  Status
                </th>
                <th className="py-3 px-3 text-right text-xs font-semibold text-gray-600 uppercase tracking-wider whitespace-nowrap w-px">
                  Action
                </th>
              </tr>
            </thead>
            <tbody className="divide-y divide-gray-100 text-sm">
              {emails.length === 0 ? (
                <tr>
                  <td colSpan={8} className="px-4 py-8 text-center text-gray-500">No emails found</td>
                </tr>
              ) : emails.map((e: Email) => (
                <tr key={e.key} className="hover:bg-blue-50 transition-colors">
                  
                  {/* TRICK FÜR SUBJECT:
                      max-w-0 ist entscheidend! In einer Tabelle erlaubt es dem Browser,
                      die Breite trotzdem zu berechnen (Restplatz), aber "truncate" zu aktivieren,
                      wenn der Inhalt diesen Restplatz sprengt.
                  */}
                  <td className="py-2 px-3 text-gray-900 w-full max-w-0 truncate" title={e.subject}>
                    {e.subject}
                  </td>

                  <td className="py-2 px-3 whitespace-nowrap text-gray-500 text-xs">
                    {formatDate(e.date)}
                  </td>
                  
                  {/* Key: Monospace, volle Breite durch whitespace-nowrap garantiert */}
                  <td className="py-2 px-3 whitespace-nowrap font-mono text-xs text-gray-600 select-all">
                    {e.key}
                  </td>
                  
                  <td className="py-2 px-3 whitespace-nowrap text-center">
                    <span className={`px-2 py-0.5 rounded text-xs font-medium ${e.processed === 'true' ? 'bg-green-100 text-green-700' : 'bg-gray-100 text-gray-600'}`}>
                      {e.processed === 'true' ? 'Y' : 'N'}
                    </span>
                  </td>
                  
                  <td className="py-2 px-3 whitespace-nowrap text-gray-500 text-xs">
                    {e.processedBy ? e.processedBy.split('@')[0] : '-'}
                  </td>
                  
                  <td className="py-2 px-3 whitespace-nowrap text-gray-500 text-xs">
                    {e.queuedTo || '-'}
                  </td>
                  
                  <td className="py-2 px-3 whitespace-nowrap">
                    {e.status ? (
                      <span className={`text-xs ${e.status === 'delivered' ? 'text-green-600' : e.status === 'failed' ? 'text-red-600' : 'text-gray-500'}`}>
                        {e.status}
                      </span>
                    ) : '-'}
                  </td>
                  
                  <td className="py-2 px-3 whitespace-nowrap text-right font-medium">
                    <Link href={`/email?bucket=${bucket}&key=${e.key}&mailbox=${encodeURIComponent(mailbox || '')}`} className="text-blue-600 hover:text-blue-800 hover:underline">
                      View
                    </Link>
                  </td>
                </tr>
              ))}
            </tbody>
          </table>
        </div>
      </div>
    </div>
  );
}