import { useState, useEffect } from 'react';

export default function ShareModal({ 
  isOpen, 
  onClose, 
  collectionId, 
  isPublic, 
  onTogglePublic,
  onInviteUser 
}) {
  const [searchQuery, setSearchQuery] = useState('');
  const [searchResults, setSearchResults] = useState([]);
  const [invitedUsers, setInvitedUsers] = useState([]);
  const [currentUser, setCurrentUser] = useState(null);
  const [copySuccess, setCopySuccess] = useState(false);

  useEffect(() => {
    if (isOpen) {
      fetchInvitedUsers();
      fetchCurrentUser();
    }
  }, [isOpen, collectionId]);

  const fetchCurrentUser = async () => {
    try {
      const response = await fetch('/api/auth/verify', {
        headers: {
          'Authorization': `Bearer ${localStorage.getItem('auth_token')}`
        }
      });
      if (response.ok) {
        const data = await response.json();
        setCurrentUser(data.user);
      }
    } catch (error) {
      console.error('Error fetching current user:', error);
    }
  };

  const fetchInvitedUsers = async () => {
    try {
      const response = await fetch(`/api/collections/${collectionId}/permissions`, {
        headers: {
          'Authorization': `Bearer ${localStorage.getItem('auth_token')}`
        }
      });
      if (response.ok) {
        const data = await response.json();
        setInvitedUsers(data.permissions || []);
      }
    } catch (error) {
      console.error('Error fetching invited users:', error);
    }
  };

  const handleSearch = async (query) => {
    setSearchQuery(query);
    if (query.length < 2) {
      setSearchResults([]);
      return;
    }

    try {
      // Search for users by email
      const response = await fetch(`/api/users/search?q=${encodeURIComponent(query)}`, {
        headers: {
          'Authorization': `Bearer ${localStorage.getItem('auth_token')}`
        }
      });
      if (response.ok) {
        const data = await response.json();
        setSearchResults(data.users || []);
      }
    } catch (error) {
      console.error('Error searching users:', error);
    }
  };

  const handleInvite = async (emailOrUser) => {
    try {
      const email = typeof emailOrUser === 'string' ? emailOrUser : emailOrUser.email;
      
      const response = await fetch(`/api/collections/${collectionId}/permissions`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': `Bearer ${localStorage.getItem('auth_token')}`
        },
        body: JSON.stringify({
          email,
          role: 'viewer' // Default to viewer as requested
        })
      });

      if (response.ok) {
        setSearchQuery('');
        setSearchResults([]);
        fetchInvitedUsers(); // Refresh the list
        if (onInviteUser) onInviteUser(email);
      }
    } catch (error) {
      console.error('Error inviting user:', error);
    }
  };

  const handleCopyLink = () => {
    const url = window.location.href;
    navigator.clipboard.writeText(url).then(() => {
      setCopySuccess(true);
      setTimeout(() => setCopySuccess(false), 2000);
    });
  };

  const handleSocialShare = (platform) => {
    const url = window.location.href;
    const title = 'Check out this list on Deck Hearth';
    
    const shareUrls = {
      twitter: `https://twitter.com/intent/tweet?url=${encodeURIComponent(url)}&text=${encodeURIComponent(title)}`,
      facebook: `https://www.facebook.com/sharer/sharer.php?u=${encodeURIComponent(url)}`,
      reddit: `https://reddit.com/submit?url=${encodeURIComponent(url)}&title=${encodeURIComponent(title)}`,
      discord: `https://discord.com/channels/@me` // Discord doesn't have direct share URL
    };

    if (shareUrls[platform]) {
      window.open(shareUrls[platform], '_blank', 'width=600,height=400');
    }
  };

  const isValidEmail = (email) => {
    return /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email);
  };

  if (!isOpen) return null;

  return (
    <div className="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50 p-4">
      <div className="bg-white rounded-xl shadow-xl max-w-md w-full max-h-[90vh] overflow-y-auto">
        <div className="p-6">
          {/* Header */}
          <div className="flex items-center justify-between mb-6">
            <h2 className="text-xl font-bold text-gray-900">Share</h2>
            <button
              onClick={onClose}
              className="text-gray-400 hover:text-gray-600 transition-colors"
            >
              <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
              </svg>
            </button>
          </div>

          {/* Public Access Toggle */}
          <div className="mb-6 p-4 border rounded-lg">
            <div className="flex items-start space-x-3">
              <svg className="w-5 h-5 text-gray-400 mt-0.5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M13.828 10.172a4 4 0 00-5.656 0l-4 4a4 4 0 105.656 5.656l1.102-1.102m-.758-4.899a4 4 0 005.656 0l4-4a4 4 0 00-5.656-5.656l-1.1 1.1" />
              </svg>
              <div className="flex-1">
                <div className="flex items-center justify-between">
                  <div>
                    <h3 className="font-medium text-gray-900">Public access</h3>
                    <p className="text-sm text-gray-500">Anyone with a link can view</p>
                  </div>
                  <button
                    onClick={onTogglePublic}
                    className={`relative inline-flex h-6 w-11 items-center rounded-full transition-colors ${
                      isPublic ? 'bg-blue-600' : 'bg-gray-200'
                    }`}
                  >
                    <span
                      className={`inline-block h-4 w-4 transform rounded-full bg-white transition-transform ${
                        isPublic ? 'translate-x-6' : 'translate-x-1'
                      }`}
                    />
                  </button>
                </div>
                <p className="text-sm text-gray-500 mt-1">
                  This list will be available in the community.
                </p>
              </div>
            </div>
          </div>

          {/* Add People */}
          <div className="mb-6">
            <div className="relative">
              <input
                type="text"
                placeholder="Add emails or people"
                value={searchQuery}
                onChange={(e) => handleSearch(e.target.value)}
                className="w-full px-4 py-3 pl-10 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
              />
              <svg className="w-5 h-5 text-gray-400 absolute left-3 top-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z" />
              </svg>
            </div>

            {/* Search Results */}
            {searchResults.length > 0 && (
              <div className="mt-2 border border-gray-200 rounded-lg max-h-40 overflow-y-auto">
                {searchResults.map((user) => (
                  <div
                    key={user.id}
                    onClick={() => handleInvite(user)}
                    className="flex items-center p-3 hover:bg-gray-50 cursor-pointer"
                  >
                    <div className="w-8 h-8 bg-purple-600 rounded-full flex items-center justify-center mr-3">
                      <span className="text-white text-sm font-bold">
                        {user.email.charAt(0).toUpperCase()}
                      </span>
                    </div>
                    <div>
                      <div className="font-medium text-gray-900">{user.email}</div>
                      <div className="text-sm text-gray-500">Click to invite as viewer</div>
                    </div>
                  </div>
                ))}
              </div>
            )}

            {/* Email invite option */}
            {searchQuery && isValidEmail(searchQuery) && !searchResults.some(u => u.email === searchQuery) && (
              <div className="mt-2 border border-gray-200 rounded-lg">
                <div
                  onClick={() => handleInvite(searchQuery)}
                  className="flex items-center p-3 hover:bg-gray-50 cursor-pointer"
                >
                  <div className="w-8 h-8 bg-gray-400 rounded-full flex items-center justify-center mr-3">
                    <svg className="w-4 h-4 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                      <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M16 12a4 4 0 10-8 0 4 4 0 008 0zm0 0v1.5a2.5 2.5 0 005 0V12a9 9 0 10-9 9m4.5-1.206a8.959 8.959 0 01-4.5 1.207" />
                    </svg>
                  </div>
                  <div>
                    <div className="font-medium text-gray-900">Invite {searchQuery}</div>
                    <div className="text-sm text-gray-500">Send email invitation as viewer</div>
                  </div>
                </div>
              </div>
            )}
          </div>

          {/* Current Permissions */}
          <div className="mb-6">
            <p className="text-sm text-gray-700 mb-3">
              Only those invited can view or collaborate on this list.
            </p>
            
            <div className="space-y-2">
              {/* Current User */}
              {currentUser && (
                <div className="flex items-center justify-between p-3 bg-gray-50 rounded-lg">
                  <div className="flex items-center">
                    <div className="w-8 h-8 bg-purple-600 rounded-full flex items-center justify-center mr-3">
                      <span className="text-white text-sm font-bold">
                        {currentUser.email.charAt(0).toUpperCase()}
                      </span>
                    </div>
                    <div>
                      <div className="font-medium text-gray-900">
                        {currentUser.email} (You)
                      </div>
                    </div>
                  </div>
                  <span className="text-sm text-gray-500 px-2 py-1 bg-white rounded border">
                    Owner
                  </span>
                </div>
              )}

              {/* Invited Users */}
              {invitedUsers.map((permission) => (
                <div key={permission.id} className="flex items-center justify-between p-3 border rounded-lg">
                  <div className="flex items-center">
                    <div className="w-8 h-8 bg-gray-400 rounded-full flex items-center justify-center mr-3">
                      <span className="text-white text-sm font-bold">
                        {permission.user_email?.charAt(0).toUpperCase() || '?'}
                      </span>
                    </div>
                    <div>
                      <div className="font-medium text-gray-900">
                        {permission.user_email || 'Unknown User'}
                      </div>
                    </div>
                  </div>
                  <span className="text-sm text-gray-500 px-2 py-1 bg-gray-100 rounded">
                    {permission.role === 'editor' ? 'Collaborator' : 'Viewer'}
                  </span>
                </div>
              ))}
            </div>
          </div>

          {/* Share Link */}
          <div className="mb-6">
            <div className="flex space-x-2">
              <input
                type="text"
                value={window.location.href}
                readOnly
                className="flex-1 px-3 py-2 bg-gray-50 border border-gray-300 rounded-lg text-sm text-gray-600"
              />
              <button
                onClick={handleCopyLink}
                className={`px-4 py-2 rounded-lg text-sm font-medium transition-colors ${
                  copySuccess 
                    ? 'bg-green-100 text-green-800 border border-green-200' 
                    : 'bg-blue-600 text-white hover:bg-blue-700'
                }`}
              >
                {copySuccess ? 'Copied!' : 'Copy link'}
              </button>
            </div>
          </div>

          {/* Social Share */}
          <div className="grid grid-cols-4 gap-4">
            {[
              { name: 'Twitter', icon: 'twitter', platform: 'twitter' },
              { name: 'Facebook', icon: 'facebook', platform: 'facebook' },
              { name: 'Reddit', icon: 'reddit', platform: 'reddit' },
              { name: 'Discord', icon: 'discord', platform: 'discord' }
            ].map((social) => (
              <button
                key={social.platform}
                onClick={() => handleSocialShare(social.platform)}
                className="flex flex-col items-center p-3 rounded-lg border hover:bg-gray-50 transition-colors"
              >
                <div className="w-8 h-8 mb-2 text-gray-600">
                  {social.icon === 'twitter' && (
                    <svg viewBox="0 0 24 24" fill="currentColor">
                      <path d="M23.953 4.57a10 10 0 01-2.825.775 4.958 4.958 0 002.163-2.723c-.951.555-2.005.959-3.127 1.184a4.92 4.92 0 00-8.384 4.482C7.69 8.095 4.067 6.13 1.64 3.162a4.822 4.822 0 00-.666 2.475c0 1.71.87 3.213 2.188 4.096a4.904 4.904 0 01-2.228-.616v.06a4.923 4.923 0 003.946 4.827 4.996 4.996 0 01-2.212.085 4.936 4.936 0 004.604 3.417 9.867 9.867 0 01-6.102 2.105c-.39 0-.779-.023-1.17-.067a13.995 13.995 0 007.557 2.209c9.053 0 13.998-7.496 13.998-13.985 0-.21 0-.42-.015-.63A9.935 9.935 0 0024 4.59z"/>
                    </svg>
                  )}
                  {social.icon === 'facebook' && (
                    <svg viewBox="0 0 24 24" fill="currentColor">
                      <path d="M24 12.073c0-6.627-5.373-12-12-12s-12 5.373-12 12c0 5.99 4.388 10.954 10.125 11.854v-8.385H7.078v-3.47h3.047V9.43c0-3.007 1.792-4.669 4.533-4.669 1.312 0 2.686.235 2.686.235v2.953H15.83c-1.491 0-1.956.925-1.956 1.874v2.25h3.328l-.532 3.47h-2.796v8.385C19.612 23.027 24 18.062 24 12.073z"/>
                    </svg>
                  )}
                  {social.icon === 'reddit' && (
                    <svg viewBox="0 0 24 24" fill="currentColor">
                      <path d="M12 0A12 12 0 0 0 0 12a12 12 0 0 0 12 12 12 12 0 0 0 12-12A12 12 0 0 0 12 0zm5.01 4.744c.688 0 1.25.561 1.25 1.249a1.25 1.25 0 0 1-2.498.056l-2.597-.547-.8 3.747c1.824.07 3.48.632 4.674 1.488.308-.309.73-.491 1.207-.491.968 0 1.754.786 1.754 1.754 0 .716-.435 1.333-1.01 1.614a3.111 3.111 0 0 1 .042.52c0 2.694-3.13 4.87-7.004 4.87-3.874 0-7.004-2.176-7.004-4.87 0-.183.015-.366.043-.534A1.748 1.748 0 0 1 4.028 12c0-.968.786-1.754 1.754-1.754.463 0 .898.196 1.207.49 1.207-.883 2.878-1.43 4.744-1.487l.885-4.182a.342.342 0 0 1 .14-.197.35.35 0 0 1 .238-.042l2.906.617a1.214 1.214 0 0 1 1.108-.701zM9.25 12C8.561 12 8 12.562 8 13.25c0 .687.561 1.248 1.25 1.248.687 0 1.248-.561 1.248-1.249 0-.688-.561-1.249-1.249-1.249zm5.5 0c-.687 0-1.248.561-1.248 1.25 0 .687.561 1.248 1.249 1.248.688 0 1.249-.561 1.249-1.249 0-.687-.562-1.249-1.25-1.249zm-5.466 3.99a.327.327 0 0 0-.231.094.33.33 0 0 0 0 .463c.842.842 2.484.913 2.961.913.477 0 2.105-.056 2.961-.913a.361.361 0 0 0 .029-.463.33.33 0 0 0-.464 0c-.547.533-1.684.73-2.512.73-.828 0-1.979-.196-2.512-.73a.326.326 0 0 0-.232-.095z"/>
                    </svg>
                  )}
                  {social.icon === 'discord' && (
                    <svg viewBox="0 0 24 24" fill="currentColor">
                      <path d="M20.317 4.3698a19.7913 19.7913 0 00-4.8851-1.5152.0741.0741 0 00-.0785.0371c-.211.3753-.4447.8648-.6083 1.2495-1.8447-.2762-3.68-.2762-5.4868 0-.1636-.3933-.4058-.8742-.6177-1.2495a.077.077 0 00-.0785-.037 19.7363 19.7363 0 00-4.8852 1.515.0699.0699 0 00-.0321.0277C.5334 9.0458-.319 13.5799.0992 18.0578a.0824.0824 0 00.0312.0561c2.0528 1.5076 4.0413 2.4228 5.9929 3.0294a.0777.0777 0 00.0842-.0276c.4616-.6304.8731-1.2952 1.226-1.9942a.076.076 0 00-.0416-.1057c-.6528-.2476-1.2743-.5495-1.8722-.8923a.077.077 0 01-.0076-.1277c.1258-.0943.2517-.1923.3718-.2914a.0743.0743 0 01.0776-.0105c3.9278 1.7933 8.18 1.7933 12.0614 0a.0739.0739 0 01.0785.0095c.1202.099.246.1981.3728.2924a.077.077 0 01-.0066.1276 12.2986 12.2986 0 01-1.873.8914.0766.0766 0 00-.0407.1067c.3604.698.7719 1.3628 1.225 1.9932a.076.076 0 00.0842.0286c1.961-.6067 3.9495-1.5219 6.0023-3.0294a.077.077 0 00.0313-.0552c.5004-5.177-.8382-9.6739-3.5485-13.6604a.061.061 0 00-.0312-.0286zM8.02 15.3312c-1.1825 0-2.1569-1.0857-2.1569-2.419 0-1.3332.9555-2.4189 2.157-2.4189 1.2108 0 2.1757 1.0952 2.1568 2.419-.0002 1.3332-.9555 2.4189-2.1569 2.4189zm7.9748 0c-1.1825 0-2.1569-1.0857-2.1569-2.419 0-1.3332.9554-2.4189 2.1569-2.4189 1.2108 0 2.1757 1.0952 2.1568 2.419 0 1.3332-.9555 2.4189-2.1568 2.4189Z"/>
                    </svg>
                  )}
                </div>
                <span className="text-xs text-gray-600">{social.name}</span>
              </button>
            ))}
          </div>
        </div>
      </div>
    </div>
  );
}