import React, { useEffect, useState } from 'react';
import { Plus, Search, Edit, Trash2, X } from 'lucide-react';
import { userService, User } from '../../services/api';
import { toast } from 'react-toastify';
import Loading from '../../components/common/Loading';
import Pagination from '../../components/common/Pagination';
import useAuthStore from '../../store/useAuthStore';

const UserManagementPage: React.FC = () => {
  const { userInfo } = useAuthStore();
  const [users, setUsers] = useState<User[]>([]);
  const [loading, setLoading] = useState(true);
  const [showModal, setShowModal] = useState(false);
  const [editingUser, setEditingUser] = useState<User | null>(null);
  const [filters, setFilters] = useState({
    search: '',
    role: '',
    status: '',
  });
  const [currentPage, setCurrentPage] = useState(1);
  const [totalPages, setTotalPages] = useState(1);
  const [totalItems, setTotalItems] = useState(0);
  const itemsPerPage = 5;

  const [formData, setFormData] = useState({
    full_name: '',
    email: '',
    phone_number: '',
    password: '',
    role: 'customer',
    status: 'active',
  });

  useEffect(() => {
    setCurrentPage(1);
  }, [filters]);

  useEffect(() => {
    fetchUsers();
  }, [filters, currentPage]);

  const fetchUsers = async () => {
    try {
      setLoading(true);
      console.log('Fetching users with filters:', filters, 'page:', currentPage);
      const response = await userService.getUsers({
        ...filters,
        page: currentPage,
        limit: itemsPerPage,
      });
      console.log('Users response:', response);
      setUsers(response.data.users);
      if (response.data.pagination) {
        setTotalPages(response.data.pagination.totalPages);
        setTotalItems(response.data.pagination.total);
      }
    } catch (error: any) {
      console.error('Error fetching users:', error);
      toast.error(error.response?.data?.message || 'Unable to load users list');
    } finally {
      setLoading(false);
    }
  };

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    try {
      if (editingUser) {
        // When updating, only send password if changed
        const updateData: any = {
          full_name: formData.full_name,
          email: formData.email,
          phone_number: formData.phone_number,
          role: formData.role,
          status: formData.status,
        };
        
        // Only add password if user entered a new one
        if (formData.password && formData.password.trim() !== '') {
          updateData.password = formData.password;
        }
        
        console.log('Updating user:', editingUser.id, 'with data:', updateData);
        const response = await userService.updateUser(editingUser.id, updateData);
        console.log('Update response:', response);
        toast.success('User updated successfully');
      } else {
        // When creating new, need complete information
        if (!formData.password || formData.password.trim() === '') {
          toast.error('Please enter password');
          return;
        }
        console.log('Creating user with data:', formData);
        const response = await userService.createUser(formData);
        console.log('Create response:', response);
        toast.success('User added successfully');
      }
      
      // Close modal and reset form first
      setShowModal(false);
      resetForm();
      
      // Reload users list after a bit to ensure DB is updated
      setTimeout(() => {
        fetchUsers();
      }, 300);
    } catch (error: any) {
      console.error('Error submitting user:', error);
      toast.error(error.response?.data?.message || 'An error occurred');
    }
  };

  const handleEdit = (user: User) => {
    setEditingUser(user);
    setFormData({
      full_name: user.full_name,
      email: user.email,
      phone_number: user.phone_number || '',
      password: '',
      role: user.role,
      status: user.status || 'active',
    });
    setShowModal(true);
  };

  const handleDelete = async (id: number) => {
    // Prevent self-deletion
    if (userInfo?.id === id) {
      toast.error('You cannot delete your own account');
      return;
    }

    if (!window.confirm('Are you sure you want to delete this user?')) return;
    
    try {
      console.log('Deleting user:', id);
      await userService.deleteUser(id);
      toast.success('User deleted successfully');
      fetchUsers();
    } catch (error: any) {
      console.error('Error deleting user:', error);
      toast.error(error.response?.data?.message || 'Unable to delete user');
    }
  };

  const resetForm = () => {
    setEditingUser(null);
    setFormData({
      full_name: '',
      email: '',
      phone_number: '',
      password: '',
      role: 'customer',
      status: 'active',
    });
  };

  const getRoleBadge = (role: string) => {
    const badges: Record<string, { bg: string; text: string; label: string; border: string }> = {
      admin: { 
        bg: 'bg-gradient-to-r from-rose-50 to-red-50', 
        text: 'text-rose-800', 
        label: 'Admin',
        border: 'border-rose-200'
      },
      staff: { 
        bg: 'bg-gradient-to-r from-blue-50 to-indigo-50', 
        text: 'text-blue-800', 
        label: 'Staff',
        border: 'border-blue-200'
      },
      customer: { 
        bg: 'bg-gradient-to-r from-emerald-50 to-green-50', 
        text: 'text-emerald-800', 
        label: 'Customer',
        border: 'border-emerald-200'
      },
    };
    const badge = badges[role] || badges.customer;
    return (
      <span className={`px-4 py-1.5 rounded-full text-xs font-semibold border shadow-sm ${badge.bg} ${badge.text} ${badge.border}`}>
        {badge.label}
      </span>
    );
  };

  if (loading) {
    return <Loading />;
  }

  return (
    <div className="space-y-8 bg-gradient-to-br from-slate-50 via-white to-slate-50 min-h-screen -m-6 p-8">
      {/* Luxury Header */}
      <div className="flex justify-between items-center animate-fade-in">
        <div>
          <div className="flex items-center gap-3 mb-2">
            <div className="h-1 w-16 bg-gradient-to-r from-amber-400 to-amber-600 rounded-full"></div>
            <h1 className="text-4xl font-bold bg-gradient-to-r from-slate-900 via-slate-800 to-slate-900 bg-clip-text text-transparent tracking-tight">
              User Management
            </h1>
          </div>
          <p className="text-slate-600 mt-3 text-lg font-light">Manage accounts and permissions</p>
        </div>
        <button
          onClick={() => {
            resetForm();
            setShowModal(true);
          }}
          className="flex items-center gap-2 px-6 py-3 bg-gradient-to-r from-amber-500 to-amber-600 text-white rounded-xl font-semibold hover:from-amber-600 hover:to-amber-700 transition-all duration-200 shadow-lg hover:shadow-xl"
        >
          <Plus className="w-5 h-5" />
          Add User
        </button>
      </div>

      {/* Luxury Filter Card */}
      <div className="bg-white/80 backdrop-blur-sm rounded-2xl shadow-xl border border-slate-200/60 p-6 animate-fade-in" style={{ animationDelay: '0.1s' }}>
        <div className="grid grid-cols-1 md:grid-cols-3 gap-5">
          <div className="relative group">
            <Search className="absolute left-4 top-1/2 transform -translate-y-1/2 text-slate-400 w-5 h-5 group-focus-within:text-amber-500 transition-colors" />
            <input
              type="text"
              placeholder="Search by name, email..."
              value={filters.search}
              onChange={(e) => setFilters({ ...filters, search: e.target.value })}
              className="w-full pl-12 pr-4 py-3.5 bg-white border-2 border-slate-200 rounded-xl focus:border-amber-400 focus:ring-4 focus:ring-amber-100 transition-all duration-200 text-slate-700 placeholder-slate-400 font-medium shadow-sm hover:shadow-md"
            />
          </div>
          <select
            value={filters.role}
            onChange={(e) => setFilters({ ...filters, role: e.target.value })}
            className="px-4 py-3.5 bg-white border-2 border-slate-200 rounded-xl focus:border-amber-400 focus:ring-4 focus:ring-amber-100 transition-all duration-200 text-slate-700 font-medium shadow-sm hover:shadow-md cursor-pointer"
          >
            <option value="">All roles</option>
            <option value="admin">Admin</option>
            <option value="staff">Staff</option>
            <option value="customer">Customer</option>
          </select>
          <select
            value={filters.status}
            onChange={(e) => setFilters({ ...filters, status: e.target.value })}
            className="px-4 py-3.5 bg-white border-2 border-slate-200 rounded-xl focus:border-amber-400 focus:ring-4 focus:ring-amber-100 transition-all duration-200 text-slate-700 font-medium shadow-sm hover:shadow-md cursor-pointer"
          >
            <option value="">All statuses</option>
            <option value="active">Active</option>
            <option value="inactive">Inactive</option>
          </select>
        </div>
      </div>

      {/* Luxury Table Card */}
      <div className="bg-white/80 backdrop-blur-sm rounded-2xl shadow-xl border border-slate-200/60 overflow-hidden animate-fade-in" style={{ animationDelay: '0.2s' }}>
        <div className="overflow-x-auto">
          <table className="w-full">
            <thead>
              <tr className="bg-gradient-to-r from-slate-900 via-slate-800 to-slate-900">
                <th className="px-8 py-5 text-left text-xs font-bold text-amber-100 uppercase tracking-wider border-b border-slate-700">
                  Name
                </th>
                <th className="px-8 py-5 text-left text-xs font-bold text-amber-100 uppercase tracking-wider border-b border-slate-700">
                  Email
                </th>
                <th className="px-8 py-5 text-left text-xs font-bold text-amber-100 uppercase tracking-wider border-b border-slate-700">
                  Phone
                </th>
                <th className="px-8 py-5 text-left text-xs font-bold text-amber-100 uppercase tracking-wider border-b border-slate-700">
                  Role
                </th>
                <th className="px-8 py-5 text-left text-xs font-bold text-amber-100 uppercase tracking-wider border-b border-slate-700">
                  Created Date
                </th>
                <th className="px-8 py-5 text-right text-xs font-bold text-amber-100 uppercase tracking-wider border-b border-slate-700">
                  Actions
                </th>
              </tr>
            </thead>
            <tbody className="bg-white divide-y divide-slate-100">
              {users.map((user, index) => (
                <tr 
                  key={user.id} 
                  className="hover:bg-gradient-to-r hover:from-amber-50/30 hover:to-yellow-50/30 transition-all duration-200 group border-b border-slate-100"
                  style={{ animationDelay: `${index * 0.05}s` }}
                >
                  <td className="px-8 py-5 whitespace-nowrap">
                    <div className="text-sm font-semibold text-slate-900">{user.full_name}</div>
                  </td>
                  <td className="px-8 py-5 whitespace-nowrap">
                    <div className="text-sm text-slate-700">{user.email}</div>
                  </td>
                  <td className="px-8 py-5 whitespace-nowrap">
                    <div className="text-sm text-slate-600">{user.phone_number || 'N/A'}</div>
                  </td>
                  <td className="px-8 py-5 whitespace-nowrap">
                    {getRoleBadge(user.role)}
                  </td>
                  <td className="px-8 py-5 whitespace-nowrap">
                    <div className="text-sm text-slate-500">
                      {user.created_at ? new Date(user.created_at).toLocaleDateString('en-US') : 'N/A'}
                    </div>
                  </td>
                  <td className="px-8 py-5 whitespace-nowrap text-right">
                    <div className="flex items-center justify-end gap-2">
                      <button
                        onClick={() => handleEdit(user)}
                        className="p-2 rounded-lg text-blue-600 hover:text-blue-700 hover:bg-blue-50 transition-all duration-200 shadow-sm hover:shadow-md border border-blue-200 hover:border-blue-300"
                        title="Edit"
                      >
                        <Edit className="w-5 h-5" />
                      </button>
                      <button
                        onClick={() => handleDelete(user.id)}
                        className="p-2 rounded-lg text-rose-600 hover:text-rose-700 hover:bg-rose-50 transition-all duration-200 shadow-sm hover:shadow-md border border-rose-200 hover:border-rose-300 disabled:opacity-50 disabled:cursor-not-allowed"
                        disabled={userInfo?.id === user.id}
                        title="Delete"
                      >
                        <Trash2 className="w-5 h-5" />
                      </button>
                    </div>
                  </td>
                </tr>
              ))}
            </tbody>
          </table>
        </div>
        <Pagination
          currentPage={currentPage}
          totalPages={totalPages}
          onPageChange={setCurrentPage}
          totalItems={totalItems}
          itemsPerPage={itemsPerPage}
        />
      </div>

      {/* Luxury Modal */}
      {showModal && (
        <div className="fixed inset-0 bg-black/70 backdrop-blur-md flex items-center justify-center z-50 p-4 animate-fade-in">
          <div className="bg-white rounded-3xl shadow-2xl w-full max-w-md max-h-[90vh] overflow-hidden border border-slate-200 animate-scale-in">
            {/* Modal Header */}
            <div className="bg-gradient-to-r from-slate-900 via-slate-800 to-slate-900 px-6 py-5 border-b border-slate-700">
              <div className="flex justify-between items-center">
                <div>
                  <h2 className="text-2xl font-bold text-amber-100">
                    {editingUser ? 'Update User' : 'Add New User'}
                  </h2>
                  <p className="text-amber-200/80 text-sm font-light mt-1">
                    {editingUser ? 'Modify user information' : 'Create a new user account'}
                  </p>
                </div>
                <button 
                  onClick={() => setShowModal(false)}
                  className="w-10 h-10 flex items-center justify-center rounded-xl text-amber-100 hover:text-white hover:bg-slate-700/50 transition-all duration-200 border border-slate-600 hover:border-amber-400"
                >
                  <X className="w-6 h-6" />
                </button>
              </div>
            </div>
            
            {/* Modal Content */}
            <div className="p-6 overflow-y-auto max-h-[calc(90vh-120px)]">
              <form onSubmit={handleSubmit} className="space-y-5">
                <div>
                  <label className="block text-xs font-semibold text-slate-600 uppercase tracking-wider mb-2">
                    Name
                  </label>
                  <input
                    type="text"
                    value={formData.full_name}
                    onChange={(e) => setFormData({ ...formData, full_name: e.target.value })}
                    className="w-full px-4 py-3 bg-white border-2 border-slate-200 rounded-xl focus:border-amber-400 focus:ring-4 focus:ring-amber-100 transition-all duration-200 text-slate-700 font-medium shadow-sm"
                    required
                  />
                </div>
                <div>
                  <label className="block text-xs font-semibold text-slate-600 uppercase tracking-wider mb-2">
                    Email
                  </label>
                  <input
                    type="email"
                    value={formData.email}
                    onChange={(e) => setFormData({ ...formData, email: e.target.value })}
                    className="w-full px-4 py-3 bg-white border-2 border-slate-200 rounded-xl focus:border-amber-400 focus:ring-4 focus:ring-amber-100 transition-all duration-200 text-slate-700 font-medium shadow-sm"
                    required
                  />
                </div>
                <div>
                  <label className="block text-xs font-semibold text-slate-600 uppercase tracking-wider mb-2">
                    Phone Number
                  </label>
                  <input
                    type="tel"
                    value={formData.phone_number}
                    onChange={(e) => setFormData({ ...formData, phone_number: e.target.value })}
                    className="w-full px-4 py-3 bg-white border-2 border-slate-200 rounded-xl focus:border-amber-400 focus:ring-4 focus:ring-amber-100 transition-all duration-200 text-slate-700 font-medium shadow-sm"
                  />
                </div>
                <div>
                  <label className="block text-xs font-semibold text-slate-600 uppercase tracking-wider mb-2">
                    Password {editingUser && <span className="text-slate-400 normal-case">(leave blank if not changing)</span>}
                  </label>
                  <input
                    type="password"
                    value={formData.password}
                    onChange={(e) => setFormData({ ...formData, password: e.target.value })}
                    className="w-full px-4 py-3 bg-white border-2 border-slate-200 rounded-xl focus:border-amber-400 focus:ring-4 focus:ring-amber-100 transition-all duration-200 text-slate-700 font-medium shadow-sm"
                    required={!editingUser}
                  />
                </div>
                <div>
                  <label className="block text-xs font-semibold text-slate-600 uppercase tracking-wider mb-2">
                    Role
                  </label>
                  <select
                    value={formData.role}
                    onChange={(e) => setFormData({ ...formData, role: e.target.value })}
                    className="w-full px-4 py-3 bg-white border-2 border-slate-200 rounded-xl focus:border-amber-400 focus:ring-4 focus:ring-amber-100 transition-all duration-200 text-slate-700 font-medium shadow-sm cursor-pointer"
                    required
                  >
                    <option value="customer">Customer</option>
                    <option value="staff">Staff</option>
                    <option value="admin">Admin</option>
                  </select>
                </div>
                <div>
                  <label className="block text-xs font-semibold text-slate-600 uppercase tracking-wider mb-2">
                    Status
                  </label>
                  <select
                    value={formData.status}
                    onChange={(e) => setFormData({ ...formData, status: e.target.value })}
                    className="w-full px-4 py-3 bg-white border-2 border-slate-200 rounded-xl focus:border-amber-400 focus:ring-4 focus:ring-amber-100 transition-all duration-200 text-slate-700 font-medium shadow-sm cursor-pointer"
                    required
                  >
                    <option value="active">Active</option>
                    <option value="inactive">Inactive</option>
                  </select>
                </div>
                <div className="flex gap-3 pt-4 border-t border-slate-200">
                  <button
                    type="button"
                    onClick={() => setShowModal(false)}
                    className="flex-1 px-6 py-3 border-2 border-slate-300 rounded-xl text-slate-700 font-semibold hover:bg-slate-50 transition-all duration-200 shadow-sm hover:shadow-md"
                  >
                    Cancel
                  </button>
                  <button
                    type="submit"
                    className="flex-1 px-6 py-3 bg-gradient-to-r from-amber-500 to-amber-600 text-white rounded-xl font-semibold hover:from-amber-600 hover:to-amber-700 transition-all duration-200 shadow-lg hover:shadow-xl"
                  >
                    {editingUser ? 'Update' : 'Create'}
                  </button>
                </div>
              </form>
            </div>
          </div>
        </div>
      )}
    </div>
  );
};

export default UserManagementPage;
