import { useState, useEffect } from 'react';
import { Mail, Users, Wifi, Copy, CheckCheck } from 'lucide-react';
import { emailAPI } from '../services/api';
import { useConfig } from '../contexts/ConfigContext';


function CopyButton({ text }) {
  const [copied, setCopied] = useState(false);
  const copy = () => {
    navigator.clipboard.writeText(text);
    setCopied(true);
    setTimeout(() => setCopied(false), 1500);
  };
  return (
    <button onClick={copy} className="ml-2 text-gray-400 hover:text-gray-600" title="Copy">
      {copied ? <CheckCheck className="h-3.5 w-3.5 text-green-500" /> : <Copy className="h-3.5 w-3.5" />}
    </button>
  );
}

function InfoRow({ label, value }) {
  return (
    <div className="flex items-center justify-between py-1.5 border-b border-gray-100 last:border-0">
      <span className="text-sm text-gray-500 w-36 shrink-0">{label}</span>
      <div className="flex items-center">
        <span className="text-sm font-mono font-medium text-gray-800">{value}</span>
        <CopyButton text={value} />
      </div>
    </div>
  );
}

function Email() {
  const { domain = 'cell', service_ips = {}, service_configs = {} } = useConfig();
  const cellHost = `mail.${domain}`;
  const emailCfg = service_configs.email || {};
  const mailIp   = service_ips.vip_mail || '172.20.0.23';
  const dnsIp    = service_ips.dns      || '172.20.0.3';
  const imapPort = emailCfg.imap_port   ?? 993;
  const smtpPort = emailCfg.smtp_port   ?? 25;
  const webmailPort = emailCfg.webmail_port ?? 8888;
  const [users, setUsers] = useState([]);
  const [status, setStatus] = useState(null);
  const [isLoading, setIsLoading] = useState(true);

  useEffect(() => {
    fetchEmailData();
  }, []);

  const fetchEmailData = async () => {
    try {
      const [usersResponse, statusResponse] = await Promise.all([
        emailAPI.getUsers(),
        emailAPI.getStatus()
      ]);
      setUsers(usersResponse.data);
      setStatus(statusResponse.data);
    } catch (error) {
      console.error('Failed to fetch email data:', error);
    } finally {
      setIsLoading(false);
    }
  };

  if (isLoading) {
    return (
      <div className="flex items-center justify-center h-64">
        <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-primary-600"></div>
      </div>
    );
  }

  return (
    <div>
      <div className="mb-8">
        <h1 className="text-2xl font-bold text-gray-900">Email Services</h1>
        <p className="mt-2 text-gray-600">Postfix (SMTP) + Dovecot (IMAP)</p>
      </div>

      <div className="grid grid-cols-1 lg:grid-cols-2 gap-6">
        {/* Incoming mail */}
        <div className="card">
          <div className="flex items-center mb-4">
            <Wifi className="h-5 w-5 text-primary-500 mr-2" />
            <h3 className="text-lg font-medium text-gray-900">Incoming mail (IMAP)</h3>
          </div>
          <div className="bg-gray-50 rounded-lg px-4 py-2">
            <InfoRow label="Server"       value={cellHost} />
            <InfoRow label="Port"         value={String(imapPort)} />
            <InfoRow label="Security"     value="SSL/TLS" />
            <InfoRow label="Direct IP"    value={mailIp} />
          </div>
        </div>

        {/* Outgoing mail */}
        <div className="card">
          <div className="flex items-center mb-4">
            <Mail className="h-5 w-5 text-primary-500 mr-2" />
            <h3 className="text-lg font-medium text-gray-900">Outgoing mail (SMTP)</h3>
          </div>
          <div className="bg-gray-50 rounded-lg px-4 py-2">
            <InfoRow label="Server"       value={cellHost} />
            <InfoRow label="Port"         value={String(smtpPort)} />
            <InfoRow label="Security"     value="STARTTLS" />
            <InfoRow label="Auth"         value="Username + Password" />
          </div>
        </div>

        {/* Webmail */}
        <div className="card">
          <div className="flex items-center mb-4">
            <Mail className="h-5 w-5 text-primary-500 mr-2" />
            <h3 className="text-lg font-medium text-gray-900">Webmail</h3>
          </div>
          <div className="bg-gray-50 rounded-lg px-4 py-2">
            <InfoRow label="URL"          value={`http://mail.${domain}`} />
            <InfoRow label="Alt URL"      value={`http://webmail.${domain}`} />
            <InfoRow label="Direct IP"    value={`http://${mailIp}`} />
            <InfoRow label="Direct port"  value={String(webmailPort)} />
          </div>
          <p className="text-xs text-gray-400 mt-3">
            Requires VPN + DNS set to <span className="font-mono">{dnsIp}</span>.
          </p>
        </div>

        {/* Status */}
        <div className="card">
          <div className="flex items-center mb-4">
            <Mail className="h-6 w-6 text-primary-500 mr-2" />
            <h3 className="text-lg font-medium text-gray-900">Service Status</h3>
          </div>
          {status ? (
            <div className="space-y-2">
              <div className="flex justify-between">
                <span className="text-sm text-gray-500">Postfix (SMTP):</span>
                <span className="text-sm font-medium text-success-600">Running</span>
              </div>
              <div className="flex justify-between">
                <span className="text-sm text-gray-500">Dovecot (IMAP):</span>
                <span className="text-sm font-medium text-success-600">Running</span>
              </div>
            </div>
          ) : (
            <p className="text-gray-500 text-sm">Status unavailable</p>
          )}
        </div>

        {/* Users */}
        <div className="card lg:col-span-2">
          <div className="flex items-center mb-4">
            <Users className="h-6 w-6 text-primary-500 mr-2" />
            <h3 className="text-lg font-medium text-gray-900">Email Accounts</h3>
          </div>
          <div className="space-y-2">
            {users.length > 0 ? (
              users.map((user, index) => (
                <div key={index} className="flex justify-between items-center p-2 bg-gray-50 rounded">
                  <span className="text-sm font-medium">{user.username}</span>
                  <span className="text-sm text-gray-500">{user.domain}</span>
                </div>
              ))
            ) : (
              <p className="text-gray-500 text-sm">No email accounts configured</p>
            )}
          </div>
        </div>
      </div>
    </div>
  );
}

export default Email;
