import React, { useState, useEffect } from 'react';
import { API } from '../../api/API';
import { toast } from 'sonner';
import { useNavigate } from 'react-router-dom';
import { Plus, Edit2, Calendar, CheckCircle, XCircle } from 'lucide-react';
import { format } from 'date-fns';

interface QuestionnaireVersion {
    id: string;
    version: string;
    isActive: boolean;
    createdAt: string;
}

const QuestionnaireList: React.FC = () => {
    const [versions, setVersions] = useState<QuestionnaireVersion[]>([]);
    const [loading, setLoading] = useState(true);
    const navigate = useNavigate();

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

    const fetchVersions = async () => {
        try {
            setLoading(true);
            const response = await API.getAllQuestionnaires() as any;
            if (response.data?.success) {
                setVersions(response.data.data);
            } else {
                toast.error('Failed to load questionnaire versions');
            }
        } catch (error) {
            console.error(error);
            toast.error('Error fetching versions');
        } finally {
            setLoading(false);
        }
    };

    return (
        <div className="p-6">
            <div className="flex justify-between items-center mb-6">
                <div>
                    <h2 className="text-2xl font-bold text-slate-900">Questionnaire Versions</h2>
                    <p className="text-slate-500">Manage your questionnaire templates and versions</p>
                </div>
                <button
                    onClick={() => navigate('/questionnaire-builder')}
                    className="bg-re-red text-white px-4 py-2 rounded-lg flex items-center gap-2 hover:bg-re-red-hover transition"
                >
                    <Plus size={20} /> Create New Version
                </button>
            </div>

            {loading ? (
                <div className="flex justify-center p-12">
                    <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-re-red"></div>
                </div>
            ) : versions.length === 0 ? (
                <div className="text-center p-12 bg-white rounded-lg shadow-sm border border-slate-200">
                    <p className="text-slate-500 mb-4">No questionnaire versions found.</p>
                    <button
                        onClick={() => navigate('/questionnaire-builder')}
                        className="text-re-red font-medium hover:underline"
                    >
                        Create your first version
                    </button>
                </div>
            ) : (
                <div className="bg-white rounded-lg shadow-sm border border-slate-200 overflow-hidden">
                    <table className="w-full text-left">
                        <thead className="bg-slate-50 border-b border-slate-100">
                            <tr>
                                <th className="p-4 font-medium text-slate-600">Version Name</th>
                                <th className="p-4 font-medium text-slate-600">Status</th>
                                <th className="p-4 font-medium text-slate-600">Created At</th>
                                <th className="p-4 font-medium text-slate-600 text-right">Actions</th>
                            </tr>
                        </thead>
                        <tbody className="divide-y divide-slate-100">
                            {versions.map((v) => (
                                <tr key={v.id} className="hover:bg-slate-50 transition">
                                    <td className="p-4 font-medium text-slate-900">{v.version}</td>
                                    <td className="p-4">
                                        {v.isActive ? (
                                            <span className="inline-flex items-center gap-1.5 px-2.5 py-1 rounded-full text-xs font-medium bg-green-100 text-green-700 border border-green-200">
                                                <CheckCircle size={12} /> Active
                                            </span>
                                        ) : (
                                            <span className="inline-flex items-center gap-1.5 px-2.5 py-1 rounded-full text-xs font-medium bg-slate-100 text-slate-600 border border-slate-200">
                                                <XCircle size={12} /> Inactive
                                            </span>
                                        )}
                                    </td>
                                    <td className="p-4 text-slate-600 text-sm">
                                        <div className="flex items-center gap-2">
                                            <Calendar size={14} className="text-slate-400" />
                                            {format(new Date(v.createdAt), 'MMM dd, yyyy HH:mm')}
                                        </div>
                                    </td>
                                    <td className="p-4 text-right">
                                        <button
                                            onClick={() => navigate(`/questionnaire-builder/${v.id}`)}
                                            className="inline-flex items-center gap-1.5 px-3 py-1.5 rounded text-sm font-medium text-slate-600 hover:text-re-red hover:bg-red-50 transition border border-slate-200 hover:border-red-200"
                                        >
                                            <Edit2 size={14} /> Edit / Clone
                                        </button>
                                    </td>
                                </tr>
                            ))}
                        </tbody>
                    </table>
                </div>
            )}
        </div>
    );
};

export default QuestionnaireList;
