import { useState } from 'react';

export default function BulkInviteModal({ collectionId, isOpen, onClose, onSuccess }) {
  const [inviteData, setInviteData] = useState({
    emails: '',
    role: 'viewer',
    message: ''
  });
  const [processing, setProcessing] = useState(false);
  const [results, setResults] = useState(null);

  const handleSubmit = async (e) => {
    e.preventDefault();
    setProcessing(true);
    setResults(null);

    try {
      // Parse emails (split by comma, semicolon, or newline)
      const emailList = inviteData.emails
        .split(/[,;\n]/)
        .map(email => email.trim())
        .filter(email => email && email.includes('@'));

      if (emailList.length === 0) {
        alert('Please enter at least one valid email address');
        setProcessing(false);
        return;
      }

      // Send invitations
      const invitePromises = emailList.map(email =>
        fetch(`/api/collections/${collectionId}/permissions`, {
          method: 'POST',
          headers: {
            'Content-Type': 'application/json',
          },
          body: JSON.stringify({
            email,
            role: inviteData.role,
            message: inviteData.message
          })
        }).then(async response => ({
          email,
          success: response.ok,
          error: response.ok ? null : (await response.json()).error
        }))
      );

      const results = await Promise.all(invitePromises);
      setResults(results);

      const successCount = results.filter(r => r.success).length;
      if (successCount > 0 && onSuccess) {
        onSuccess();
      }

    } catch (error) {
      console.error('Bulk invite error:', error);
      alert('An error occurred while sending invitations');
    } finally {
      setProcessing(false);
    }
  };

  const handleClose = () => {
    setInviteData({ emails: '', role: 'viewer', message: '' });
    setResults(null);
    onClose();
  };

  const successCount = results ? results.filter(r => r.success).length : 0;
  const failureCount = results ? results.filter(r => !r.success).length : 0;

  if (!isOpen) return null;

  return (
    <div className="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50">
      <div className="p-6 rounded-2xl shadow-lg max-w-2xl w-full mx-4 max-h-90vh overflow-y-auto" style={{ backgroundColor: 'var(--bg-secondary)' }}>
        <h2 className="text-2xl font-bold mb-4" style={{ color: 'var(--text-primary)' }}>
          Bulk Invite Collaborators
        </h2>
        
        {!results ? (
          <form onSubmit={handleSubmit} className="space-y-4">
            <div>
              <label className="block text-sm font-medium mb-2" style={{ color: 'var(--text-primary)' }}>
                Email Addresses
              </label>
              <textarea
                required
                value={inviteData.emails}
                onChange={(e) => setInviteData({ ...inviteData, emails: e.target.value })}
                className="w-full px-4 py-3 rounded-lg border transition-all duration-200"
                style={{
                  backgroundColor: 'var(--bg-primary)',
                  borderColor: 'var(--border)',
                  color: 'var(--text-primary)'
                }}
                rows="6"
                placeholder="Enter email addresses separated by commas, semicolons, or new lines:
user1@example.com, user2@example.com
user3@example.com
user4@example.com"
              />
              <p className="text-xs mt-1" style={{ color: 'var(--text-secondary)' }}>
                Separate multiple email addresses with commas, semicolons, or new lines
              </p>
            </div>

            <div>
              <label className="block text-sm font-medium mb-2" style={{ color: 'var(--text-primary)' }}>
                Permission Level
              </label>
              <select
                value={inviteData.role}
                onChange={(e) => setInviteData({ ...inviteData, role: e.target.value })}
                className="w-full px-4 py-3 rounded-lg border transition-all duration-200"
                style={{
                  backgroundColor: 'var(--bg-primary)',
                  borderColor: 'var(--border)',
                  color: 'var(--text-primary)'
                }}
              >
                <option value="viewer">Viewer - Can view cards and collection</option>
                <option value="editor">Editor - Can add/remove cards and edit details</option>
                <option value="owner">Owner - Full control including permissions</option>
              </select>
            </div>

            <div>
              <label className="block text-sm font-medium mb-2" style={{ color: 'var(--text-primary)' }}>
                Personal Message (Optional)
              </label>
              <textarea
                value={inviteData.message}
                onChange={(e) => setInviteData({ ...inviteData, message: e.target.value })}
                className="w-full px-4 py-3 rounded-lg border transition-all duration-200"
                style={{
                  backgroundColor: 'var(--bg-primary)',
                  borderColor: 'var(--border)',
                  color: 'var(--text-primary)'
                }}
                rows="3"
                placeholder="Add a personal message to all invitations..."
              />
            </div>

            <div className="flex space-x-3 mt-6">
              <button
                type="button"
                onClick={handleClose}
                className="flex-1 py-2 px-4 rounded-xl border transition-colors"
                style={{ 
                  borderColor: 'var(--border)', 
                  color: 'var(--text-secondary)' 
                }}
              >
                Cancel
              </button>
              <button
                type="submit"
                disabled={processing || !inviteData.emails.trim()}
                className="flex-1 px-4 py-2 rounded-xl font-medium gradient-bg-purple text-white hover:shadow-lg transition-all duration-200 disabled:opacity-50"
              >
                {processing ? 'Sending Invitations...' : 'Send Invitations'}
              </button>
            </div>
          </form>
        ) : (
          <div className="space-y-4">
            <div className="text-center py-4">
              <div className="text-4xl mb-4">
                {failureCount === 0 ? '🎉' : '⚠️'}
              </div>
              <h3 className="text-xl font-semibold mb-2" style={{ color: 'var(--text-primary)' }}>
                Invitations Sent
              </h3>
              <p style={{ color: 'var(--text-secondary)' }}>
                {successCount} successful, {failureCount} failed
              </p>
            </div>

            <div className="max-h-60 overflow-y-auto space-y-2">
              {results.map((result, index) => (
                <div 
                  key={index}
                  className="flex items-center justify-between p-3 rounded-lg"
                  style={{ backgroundColor: 'var(--bg-primary)' }}
                >
                  <div className="flex items-center space-x-3">
                    <span className="text-lg">
                      {result.success ? '✅' : '❌'}
                    </span>
                    <span className="font-medium" style={{ color: 'var(--text-primary)' }}>
                      {result.email}
                    </span>
                  </div>
                  {result.error && (
                    <span className="text-sm text-red-500">
                      {result.error}
                    </span>
                  )}
                </div>
              ))}
            </div>

            <div className="flex justify-center mt-6">
              <button
                onClick={handleClose}
                className="px-6 py-2 rounded-xl font-medium gradient-bg-purple text-white hover:shadow-lg transition-all duration-200"
              >
                Close
              </button>
            </div>
          </div>
        )}
      </div>
    </div>
  );
}