import React, { useState } from 'react';
import { useTranslation } from 'react-i18next';
import { User } from '../types';
import { useBusinessUsers, useCreateResource, useResources } from '../hooks/useBusiness';
import {
    Plus,
    MoreHorizontal,
    User as UserIcon,
    Shield,
    Briefcase,
    Calendar
} from 'lucide-react';
import Portal from '../components/Portal';

interface StaffProps {
    onMasquerade: (user: User) => void;
    effectiveUser: User;
}

const Staff: React.FC<StaffProps> = ({ onMasquerade, effectiveUser }) => {
    const { t } = useTranslation();
    const { data: users = [], isLoading, error } = useBusinessUsers();
    const { data: resources = [] } = useResources();
    const createResourceMutation = useCreateResource();

    const [isInviteModalOpen, setIsInviteModalOpen] = useState(false);

    // Helper to check if a user is already linked to a resource
    const getLinkedResource = (userId: string) => {
        return resources.find((r: any) => r.user_id === parseInt(userId));
    };

    const handleMakeBookable = (user: any) => {
        if (confirm(`Create a bookable resource for ${user.name || user.username}?`)) {
            createResourceMutation.mutate({
                name: user.name || user.username,
                type: 'STAFF',
                user_id: user.id
            });
        }
    };

    if (isLoading) {
        return (
            <div className="p-8 max-w-7xl mx-auto">
                <div className="flex items-center justify-center py-12">
                    <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-brand-600"></div>
                </div>
            </div>
        );
    }

    if (error) {
        return (
            <div className="p-8 max-w-7xl mx-auto">
                <div className="bg-red-50 dark:bg-red-900/20 border border-red-200 dark:border-red-800 rounded-lg p-4">
                    <p className="text-red-800 dark:text-red-300">{t('staff.errorLoading')}: {(error as Error).message}</p>
                </div>
            </div>
        );
    }

    // Filter for staff/management roles
    const staffUsers = users.filter((u: any) => ['owner', 'manager', 'staff'].includes(u.role));

    return (
        <div className="p-8 max-w-7xl mx-auto space-y-6">
            {/* Header */}
            <div className="flex flex-col sm:flex-row sm:items-center justify-between gap-4">
                <div>
                    <h2 className="text-2xl font-bold text-gray-900 dark:text-white">{t('staff.title')}</h2>
                    <p className="text-gray-500 dark:text-gray-400">{t('staff.description')}</p>
                </div>
                <button
                    onClick={() => setIsInviteModalOpen(true)}
                    className="flex items-center justify-center gap-2 px-4 py-2 bg-brand-600 text-white rounded-lg hover:bg-brand-700 transition-colors shadow-sm font-medium"
                >
                    <Plus size={18} />
                    {t('staff.inviteStaff')}
                </button>
            </div>

            {/* Table */}
            <div className="bg-white dark:bg-gray-800 rounded-xl border border-gray-200 dark:border-gray-700 shadow-sm overflow-hidden transition-colors duration-200">
                <div className="overflow-x-auto">
                    <table className="w-full text-sm text-left">
                        <thead className="text-xs text-gray-500 dark:text-gray-400 uppercase bg-gray-50 dark:bg-gray-900/50 border-b border-gray-200 dark:border-gray-700">
                            <tr>
                                <th className="px-6 py-4 font-medium">{t('staff.name')}</th>
                                <th className="px-6 py-4 font-medium">{t('staff.role')}</th>
                                <th className="px-6 py-4 font-medium">{t('staff.bookableResource')}</th>
                                <th className="px-6 py-4 font-medium text-right">{t('common.actions')}</th>
                            </tr>
                        </thead>
                        <tbody className="divide-y divide-gray-100 dark:divide-gray-700">
                            {staffUsers.map((user: any) => {
                                const linkedResource = getLinkedResource(user.id);

                                // Owners/Managers can log in as anyone.
                                const canMasquerade = ['owner', 'manager'].includes(effectiveUser.role) && user.id !== effectiveUser.id;

                                return (
                                    <tr key={user.id} className="hover:bg-gray-50 dark:hover:bg-gray-700/30 transition-colors group">
                                        <td className="px-6 py-4">
                                            <div className="flex items-center gap-3">
                                                <div className="w-8 h-8 rounded-full bg-brand-100 dark:bg-brand-900/50 flex items-center justify-center text-brand-600 dark:text-brand-400 font-medium">
                                                    {user.name ? user.name.charAt(0).toUpperCase() : user.username.charAt(0).toUpperCase()}
                                                </div>
                                                <div>
                                                    <div className="font-medium text-gray-900 dark:text-white">{user.name || user.username}</div>
                                                    <div className="text-xs text-gray-500 dark:text-gray-400">{user.email}</div>
                                                </div>
                                            </div>
                                        </td>
                                        <td className="px-6 py-4">
                                            <span className={`inline-flex items-center gap-1.5 px-2.5 py-0.5 rounded-full text-xs font-medium capitalize ${user.role === 'owner' ? 'bg-purple-100 text-purple-800 dark:bg-purple-900/30 dark:text-purple-300' :
                                                    user.role === 'manager' ? 'bg-blue-100 text-blue-800 dark:bg-blue-900/30 dark:text-blue-300' :
                                                        'bg-gray-100 text-gray-800 dark:bg-gray-700 dark:text-gray-300'
                                                }`}>
                                                {user.role === 'owner' && <Shield size={12} />}
                                                {user.role === 'manager' && <Briefcase size={12} />}
                                                {user.role}
                                            </span>
                                        </td>
                                        <td className="px-6 py-4">
                                            {linkedResource ? (
                                                <span className="inline-flex items-center gap-1 text-xs font-medium text-green-600 dark:text-green-400 bg-green-50 dark:bg-green-900/20 px-2 py-1 rounded">
                                                    <Calendar size={12} />
                                                    {t('staff.yes')} ({linkedResource.name})
                                                </span>
                                            ) : (
                                                <button
                                                    onClick={() => handleMakeBookable(user)}
                                                    className="text-xs text-brand-600 hover:text-brand-700 dark:text-brand-400 hover:underline"
                                                >
                                                    {t('staff.makeBookable')}
                                                </button>
                                            )}
                                        </td>
                                        <td className="px-6 py-4 text-right">
                                            <div className="flex items-center justify-end gap-2">
                                                {canMasquerade && (
                                                    <button
                                                        onClick={() => onMasquerade(user)}
                                                        className="text-indigo-600 hover:text-indigo-500 dark:text-indigo-400 dark:hover:text-indigo-300 font-medium text-xs inline-flex items-center gap-1 px-3 py-1 border border-indigo-200 dark:border-indigo-800 rounded-lg hover:bg-indigo-50 dark:hover:bg-indigo-900/30 transition-colors"
                                                    >
                                                        {t('common.masquerade')}
                                                    </button>
                                                )}
                                                <button className="p-2 text-gray-400 hover:text-gray-600 dark:hover:text-gray-300 hover:bg-gray-100 dark:hover:bg-gray-700 rounded-lg transition-colors">
                                                    <MoreHorizontal size={18} />
                                                </button>
                                            </div>
                                        </td>
                                    </tr>
                                );
                            })}
                        </tbody>
                    </table>
                </div>
            </div>

            {/* Invite Modal Placeholder */}
            {isInviteModalOpen && (
                <Portal>
                    <div className="fixed inset-0 z-50 flex items-center justify-center p-4 bg-black/50 backdrop-blur-sm">
                        <div className="bg-white dark:bg-gray-800 rounded-xl shadow-xl w-full max-w-md p-6">
                            <h3 className="text-lg font-semibold mb-4 dark:text-white">{t('staff.inviteModalTitle')}</h3>
                            <p className="text-gray-500 dark:text-gray-400 mb-6">{t('staff.inviteModalDescription')}</p>
                            <div className="flex justify-end">
                                <button onClick={() => setIsInviteModalOpen(false)} className="px-4 py-2 bg-gray-100 dark:bg-gray-700 rounded-lg text-gray-700 dark:text-gray-300">{t('common.close')}</button>
                            </div>
                        </div>
                    </div>
                </Portal>
            )}
        </div>
    );
};

export default Staff;