import { useState, useEffect } from 'react';
import {
  Plus,
  Edit2,
  Trash2,
  Search,
  Copy,
  Check,
  AlertCircle,
  Tag,
} from 'lucide-react';
import { useAddressBookStore, AddressBookEntry } from '../../store/addressbook';

export default function AddressBookPage() {
  const {
    entries,
    isLoading,
    error,
    clearError,
    fetchAll,
    addEntry,
    updateEntry,
    deleteEntry,
  } = useAddressBookStore();

  const [searchQuery, setSearchQuery] = useState('');
  const [showAddModal, setShowAddModal] = useState(false);
  const [editingEntry, setEditingEntry] = useState<AddressBookEntry | null>(null);
  const [copiedAddress, setCopiedAddress] = useState<string | null>(null);

  // Form state
  const [formName, setFormName] = useState('');
  const [formAddress, setFormAddress] = useState('');
  const [formNotes, setFormNotes] = useState('');
  const [formTags, setFormTags] = useState('');

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

  const filteredEntries = entries.filter(
    (entry) =>
      entry.name.toLowerCase().includes(searchQuery.toLowerCase()) ||
      entry.address.toLowerCase().includes(searchQuery.toLowerCase()) ||
      entry.tags.some((t) => t.toLowerCase().includes(searchQuery.toLowerCase()))
  );

  const resetForm = () => {
    setFormName('');
    setFormAddress('');
    setFormNotes('');
    setFormTags('');
  };

  const handleAdd = async () => {
    if (!formName || !formAddress) return;

    try {
      const tags = formTags
        .split(',')
        .map((t) => t.trim())
        .filter(Boolean);
      await addEntry(formName, formAddress, formNotes || undefined, tags);
      setShowAddModal(false);
      resetForm();
    } catch {
      // Error handled by store
    }
  };

  const handleEdit = async () => {
    if (!editingEntry || !formName || !formAddress) return;

    try {
      const tags = formTags
        .split(',')
        .map((t) => t.trim())
        .filter(Boolean);
      await updateEntry(editingEntry.id, formName, formAddress, formNotes || undefined, tags);
      setEditingEntry(null);
      resetForm();
    } catch {
      // Error handled by store
    }
  };

  const handleDelete = async (id: string) => {
    if (!confirm('Are you sure you want to delete this contact?')) return;

    try {
      await deleteEntry(id);
    } catch {
      // Error handled by store
    }
  };

  const copyAddress = (address: string) => {
    navigator.clipboard.writeText(address);
    setCopiedAddress(address);
    setTimeout(() => setCopiedAddress(null), 2000);
  };

  const openEditModal = (entry: AddressBookEntry) => {
    setEditingEntry(entry);
    setFormName(entry.name);
    setFormAddress(entry.address);
    setFormNotes(entry.notes || '');
    setFormTags(entry.tags.join(', '));
  };

  const renderEntryCard = (entry: AddressBookEntry) => (
    <div
      key={entry.id}
      className="bg-gray-900 rounded-xl p-4 border border-gray-800 hover:border-gray-700 transition-colors"
    >
      <div className="flex items-start justify-between">
        <div className="flex-1 min-w-0">
          <div className="flex items-center gap-2">
            <h3 className="text-lg font-semibold text-white truncate">{entry.name}</h3>
          </div>
          <div className="flex items-center gap-2 mt-1">
            <code className="text-sm text-gray-400 truncate">{entry.address}</code>
            <button
              onClick={() => copyAddress(entry.address)}
              className="p-1 hover:bg-gray-800 rounded transition-colors"
            >
              {copiedAddress === entry.address ? (
                <Check size={14} className="text-green-400" />
              ) : (
                <Copy size={14} className="text-gray-500" />
              )}
            </button>
          </div>
          {entry.notes && (
            <p className="text-sm text-gray-500 mt-2 line-clamp-2">{entry.notes}</p>
          )}
          {entry.tags.length > 0 && (
            <div className="flex flex-wrap gap-1 mt-2">
              {entry.tags.map((tag, i) => (
                <span
                  key={i}
                  className="px-2 py-0.5 bg-synor-600/20 text-synor-400 text-xs rounded-full"
                >
                  {tag}
                </span>
              ))}
            </div>
          )}
        </div>
        <div className="flex items-center gap-1 ml-4">
          <button
            onClick={() => openEditModal(entry)}
            className="p-2 hover:bg-gray-800 rounded-lg transition-colors"
          >
            <Edit2 size={18} className="text-gray-400" />
          </button>
          <button
            onClick={() => handleDelete(entry.id)}
            className="p-2 hover:bg-gray-800 rounded-lg transition-colors"
          >
            <Trash2 size={18} className="text-red-400" />
          </button>
        </div>
      </div>
    </div>
  );

  return (
    <div className="space-y-6">
      {/* Header */}
      <div className="flex items-center justify-between">
        <div>
          <h1 className="text-2xl font-bold text-white">Address Book</h1>
          <p className="text-gray-400 mt-1">Manage your saved addresses</p>
        </div>
        <button
          onClick={() => setShowAddModal(true)}
          className="flex items-center gap-2 px-4 py-2 bg-synor-600 hover:bg-synor-700 rounded-lg text-white font-medium transition-colors"
        >
          <Plus size={18} />
          Add Contact
        </button>
      </div>

      {/* Error Alert */}
      {error && (
        <div className="flex items-center gap-3 p-4 bg-red-900/20 border border-red-800 rounded-lg">
          <AlertCircle className="text-red-400" size={20} />
          <p className="text-red-400 flex-1">{error}</p>
          <button onClick={clearError} className="text-red-400 hover:text-red-300">
            ×
          </button>
        </div>
      )}

      {/* Search */}
      <div className="relative">
        <Search
          size={18}
          className="absolute left-3 top-1/2 -translate-y-1/2 text-gray-500"
        />
        <input
          type="text"
          value={searchQuery}
          onChange={(e) => setSearchQuery(e.target.value)}
          placeholder="Search by name, address, or tag..."
          className="w-full pl-10 pr-4 py-3 bg-gray-900 border border-gray-800 rounded-lg text-white placeholder-gray-500 focus:outline-none focus:border-synor-500"
        />
      </div>

      {/* All Contacts */}
      <div>
        <h2 className="text-sm font-medium text-gray-400 uppercase tracking-wider mb-3">
          All Contacts ({filteredEntries.length})
        </h2>
        {filteredEntries.length > 0 ? (
          <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
            {filteredEntries.map(renderEntryCard)}
          </div>
        ) : (
          <div className="text-center py-12 text-gray-500">
            {searchQuery ? 'No contacts found' : 'No contacts yet'}
          </div>
        )}
      </div>

      {/* Add/Edit Modal */}
      {(showAddModal || editingEntry) && (
        <div className="fixed inset-0 bg-black/50 flex items-center justify-center z-50">
          <div className="bg-gray-900 rounded-xl p-6 w-full max-w-md border border-gray-800">
            <h2 className="text-xl font-bold text-white mb-4">
              {editingEntry ? 'Edit Contact' : 'Add Contact'}
            </h2>

            <div className="space-y-4">
              <div>
                <label className="block text-sm text-gray-400 mb-1">Name *</label>
                <input
                  type="text"
                  value={formName}
                  onChange={(e) => setFormName(e.target.value)}
                  placeholder="Contact name"
                  className="w-full px-4 py-2 bg-gray-800 border border-gray-700 rounded-lg text-white placeholder-gray-500 focus:outline-none focus:border-synor-500"
                />
              </div>

              <div>
                <label className="block text-sm text-gray-400 mb-1">Address *</label>
                <input
                  type="text"
                  value={formAddress}
                  onChange={(e) => setFormAddress(e.target.value)}
                  placeholder="synor1..."
                  className="w-full px-4 py-2 bg-gray-800 border border-gray-700 rounded-lg text-white font-mono text-sm placeholder-gray-500 focus:outline-none focus:border-synor-500"
                />
              </div>

              <div>
                <label className="block text-sm text-gray-400 mb-1">
                  Tags (comma separated)
                </label>
                <div className="relative">
                  <Tag
                    size={16}
                    className="absolute left-3 top-1/2 -translate-y-1/2 text-gray-500"
                  />
                  <input
                    type="text"
                    value={formTags}
                    onChange={(e) => setFormTags(e.target.value)}
                    placeholder="e.g., Exchange, Friend, Business"
                    className="w-full pl-10 pr-4 py-2 bg-gray-800 border border-gray-700 rounded-lg text-white placeholder-gray-500 focus:outline-none focus:border-synor-500"
                  />
                </div>
              </div>

              <div>
                <label className="block text-sm text-gray-400 mb-1">Notes</label>
                <textarea
                  value={formNotes}
                  onChange={(e) => setFormNotes(e.target.value)}
                  placeholder="Optional notes about this contact"
                  rows={3}
                  className="w-full px-4 py-2 bg-gray-800 border border-gray-700 rounded-lg text-white placeholder-gray-500 focus:outline-none focus:border-synor-500 resize-none"
                />
              </div>
            </div>

            <div className="flex gap-3 mt-6">
              <button
                onClick={() => {
                  setShowAddModal(false);
                  setEditingEntry(null);
                  resetForm();
                }}
                className="flex-1 px-4 py-2 bg-gray-700 hover:bg-gray-600 rounded-lg text-gray-300 font-medium transition-colors"
              >
                Cancel
              </button>
              <button
                onClick={editingEntry ? handleEdit : handleAdd}
                disabled={!formName || !formAddress || isLoading}
                className="flex-1 px-4 py-2 bg-synor-600 hover:bg-synor-700 rounded-lg text-white font-medium transition-colors disabled:opacity-50"
              >
                {isLoading ? 'Saving...' : editingEntry ? 'Save Changes' : 'Add Contact'}
              </button>
            </div>
          </div>
        </div>
      )}
    </div>
  );
}