import React, { useState, useEffect } from 'react';
import { useAuth } from '../context/AuthContext';
import Sidebar from '../components/Sidebar';
import { Users, CheckCircle, XCircle, Clock, Calendar, FileText, Menu, Eye, MessageSquare } from 'lucide-react';

const Collaborateur = () => {
    const { user } = useAuth();
    const [sidebarOpen, setSidebarOpen] = useState(false);
    const isEmployee = user?.role === 'Collaborateur' || 'Apprenti';
    const [teamMembers, setTeamMembers] = useState([]);
    const [pendingRequests, setPendingRequests] = useState([]);
    const [allRequests, setAllRequests] = useState([]);
    const [isLoading, setIsLoading] = useState(true);
    const [selectedRequest, setSelectedRequest] = useState(null);
    const [showValidationModal, setShowValidationModal] = useState(false);
    const [validationComment, setValidationComment] = useState('');
    const [validationAction, setValidationAction] = useState('');

    useEffect(() => {
        if (user?.id) {
            fetchTeamData();
        }
    }, [user]);

    const fetchTeamData = async () => {
        try {
            setIsLoading(true);

            // Récupérer les membres de l'équipe
            await fetchTeamMembers();

            // Récupérer les demandes en attente
            await fetchPendingRequests();

            // Récupérer toutes les demandes de l'équipe
            await fetchAllTeamRequests();

        } catch (error) {
            console.error('Erreur lors de la récupération des données équipe:', error);
        } finally {
            setIsLoading(false);
        }
    };

    const fetchTeamMembers = async () => {
        try {
            const response = await fetch(`/api/getTeamMembers?manager_id=${user.id}`);
            const text = await response.text();
            console.log('Réponse équipe:', text);

            const data = JSON.parse(text);
            if (data.success) {
                setTeamMembers(data.team_members || []);
            }
        } catch (error) {
            console.error('Erreur récupération équipe:', error);
            setTeamMembers([]);
        }
    };

    const fetchPendingRequests = async () => {
        try {
            const response = await fetch(`/api/getPendingRequests?manager_id=${user.id}`);
            const text = await response.text();
            console.log('Réponse demandes en attente:', text);

            const data = JSON.parse(text);
            if (data.success) {
                setPendingRequests(data.requests || []);
            }
        } catch (error) {
            console.error('Erreur récupération demandes en attente:', error);
            setPendingRequests([]);
        }
    };

    const fetchAllTeamRequests = async () => {
        try {
            const response = await fetch(`/api/getAllTeamRequests?SuperieurId=${user.id}`);
            const text = await response.text();
            console.log('Réponse toutes demandes équipe:', text);

            const data = JSON.parse(text);
            if (data.success) {
                setAllRequests(data.requests || []);
            }
        } catch (error) {

            console.error('Erreur récupération toutes demandes:', error);
            console.log('Réponse brute:', text);
            setAllRequests([]);
        }
    };

    const handleValidateRequest = async (requestId, action, comment = '') => {
        try {
            const response = await fetch('/api/validateRequest', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                },
                body: JSON.stringify({
                    request_id: requestId,
                    action: action, // 'approve' ou 'reject'
                    comment: comment,
                    validator_id: user.id
                }),
            });

            const text = await response.text();
            console.log('Réponse validation:', text);

            const data = JSON.parse(text);

            if (data.success) {
                // Rafraîchir les données
                await fetchTeamData();
                setShowValidationModal(false);
                setSelectedRequest(null);
                setValidationComment('');

                alert(`Demande ${action === 'approve' ? 'approuvée' : 'refusée'} avec succès !`);
            } else {
                alert(`Erreur: ${data.message}`);
            }
        } catch (error) {
            console.error('Erreur validation:', error);
            alert('Erreur lors de la validation');
        }
    };

    const openValidationModal = (request, action) => {
        setSelectedRequest(request);
        setValidationAction(action);
        setValidationComment('');
        setShowValidationModal(true);
    };

    const getStatusColor = (status) => {
        switch (status) {
            case 'En attente': return 'bg-yellow-100 text-yellow-800';
            case 'Validée':
            case 'Approuvé': return 'bg-green-100 text-green-800';
            case 'Refusée': return 'bg-red-100 text-red-800';
            default: return 'bg-gray-100 text-gray-800';
        }
    };

    const getTypeColor = (type) => {
        switch (type) {
            case 'Congés payés':
            case 'Congé payé': return 'bg-blue-100 text-blue-800';
            case 'RTT': return 'bg-green-100 text-green-800';
            case 'Congé maladie': return 'bg-red-100 text-red-800';
            default: return 'bg-gray-100 text-gray-800';
        }
    };

    if (isLoading) {
        return (
            <div className="min-h-screen bg-gray-50">
                <Sidebar isOpen={sidebarOpen} onToggle={() => setSidebarOpen(!sidebarOpen)} />
                <div className="lg:ml-60 flex items-center justify-center min-h-screen">
                    <div className="text-center">
                        <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-blue-600 mx-auto mb-4"></div>
                        <p className="text-gray-600">Chargement des données équipe...</p>
                    </div>
                </div>
            </div>
        );
    }

    return (
        <div className="min-h-screen bg-gray-50 flex">
            <Sidebar isOpen={sidebarOpen} onToggle={() => setSidebarOpen(!sidebarOpen)} />

            <div className="flex-1 lg:ml-60">
                <div className="p-4 lg:p-8 w-full">
                    {/* Mobile menu button */}
                    <div className="lg:hidden mb-4">
                        <button
                            onClick={() => setSidebarOpen(true)}
                            className="p-2 rounded-lg bg-white shadow-sm border border-gray-200"
                        >
                            <Menu className="w-6 h-6" />
                        </button>
                    </div>

                    {/* Header */}
                    <div className="mb-8">
                        <h1 className="text-2xl lg:text-3xl font-bold text-gray-900 mb-2">
                            {isEmployee ? 'Mon équipe 👥' : 'Gestion d\'équipe 👥'}
                        </h1>

                    </div>

                    {/* Stats Cards */}
                    <div className="grid grid-cols-2 lg:grid-cols-4 gap-3 lg:gap-6 mb-8">
                        <div className="bg-white rounded-xl p-6 shadow-sm border border-gray-100">
                            <div className="flex items-center justify-between">
                                <div>
                                    <p className="text-xs lg:text-sm font-medium text-gray-600">Équipe</p>
                                    <p className="text-xl lg:text-2xl font-bold text-gray-900">{teamMembers.length}</p>
                                    <p className="text-xs text-gray-500">membres</p>
                                </div>
                                <div className="w-8 h-8 lg:w-12 lg:h-12 bg-blue-100 rounded-lg flex items-center justify-center">
                                    <Users className="w-4 h-4 lg:w-6 lg:h-6 text-blue-600" />
                                </div>
                            </div>
                        </div>

                        <div className="bg-white rounded-xl p-6 shadow-sm border border-gray-100">
                            <div className="flex items-center justify-between">
                                <div>
                                    <p className="text-xs lg:text-sm font-medium text-gray-600">En attente</p>
                                    <p className="text-xl lg:text-2xl font-bold text-gray-900">{pendingRequests.length}</p>
                                    <p className="text-xs text-gray-500">demandes</p>
                                </div>
                                <div className="w-8 h-8 lg:w-12 lg:h-12 bg-yellow-100 rounded-lg flex items-center justify-center">
                                    <Clock className="w-4 h-4 lg:w-6 lg:h-6 text-yellow-600" />
                                </div>
                            </div>
                        </div>




                    </div>

                    {/* Main Content */}
                    <div className="grid grid-cols-1 lg:grid-cols-2 gap-6">
                        {/* Demandes en attente */}
                        {!isEmployee && (
                            <div className="bg-white rounded-xl shadow-sm border border-gray-100">
                                <div className="p-4 lg:p-6 border-b border-gray-100">
                                    <h2 className="text-lg lg:text-xl font-semibold text-gray-900 flex items-center gap-2">
                                        <Clock className="w-5 h-5 text-yellow-600" />
                                        Demandes en attente ({pendingRequests.length})
                                    </h2>
                                </div>
                                <div className="p-4 lg:p-6">
                                    {pendingRequests.length === 0 ? (
                                        <div className="text-center py-8">
                                            <Clock className="w-12 h-12 text-gray-400 mx-auto mb-3" />
                                            <p className="text-gray-600">Aucune demande en attente</p>
                                        </div>
                                    ) : (
                                        <div className="space-y-4">
                                            {pendingRequests.map((request) => (
                                                <div key={request.id} className="border border-gray-200 rounded-lg p-4">
                                                    <div className="flex items-start justify-between mb-3">
                                                        <div className="flex-1">
                                                            <div className="flex items-center gap-2 mb-1">
                                                                <h3 className="font-medium text-gray-900">{request.employee_name}</h3>
                                                                <span className={`px-2 py-1 rounded-full text-xs font-medium ${getTypeColor(request.type)}`}>
                                                                    {request.type}
                                                                </span>
                                                            </div>
                                                            <p className="text-sm text-gray-600">{request.date_display}</p>
                                                            <p className="text-xs text-gray-500">Soumis le {request.submitted_display}</p>
                                                        </div>
                                                        <div className="text-right">
                                                            <p className="font-medium text-gray-900">{request.days}j</p>
                                                        </div>
                                                    </div>

                                                    {request.reason && (
                                                        <div className="mb-3 p-2 bg-gray-50 rounded text-sm text-gray-700">
                                                            <strong>Motif:</strong> {request.reason}
                                                        </div>
                                                    )}

                                                    <div className="flex gap-2">
                                                        <button
                                                            onClick={() => openValidationModal(request, 'approve')}
                                                            className="flex-1 bg-green-600 text-white px-3 py-2 rounded-lg hover:bg-green-700 transition-colors flex items-center justify-center gap-2 text-sm"
                                                        >
                                                            <CheckCircle className="w-4 h-4" />
                                                            Approuver
                                                        </button>
                                                        <button
                                                            onClick={() => openValidationModal(request, 'reject')}
                                                            className="flex-1 bg-red-600 text-white px-3 py-2 rounded-lg hover:bg-red-700 transition-colors flex items-center justify-center gap-2 text-sm"
                                                        >
                                                            <XCircle className="w-4 h-4" />
                                                            Refuser
                                                        </button>
                                                    </div>
                                                </div>
                                            ))}
                                        </div>
                                    )}
                                </div>
                            </div>
                        )}

                        {/* Équipe */}
                        <div className={`bg-white rounded-xl shadow-sm border border-gray-100 ${isEmployee ? 'lg:col-span-2' : ''}`}>
                            <div className="p-4 lg:p-6 border-b border-gray-100">
                                <h2 className="text-lg lg:text-xl font-semibold text-gray-900 flex items-center gap-2">
                                    <Users className="w-5 h-5 text-blue-600" />
                                    Mon équipe ({teamMembers.length})
                                </h2>
                            </div>
                            <div className="p-4 lg:p-6">
                                {teamMembers.length === 0 ? (
                                    <div className="text-center py-8">
                                        <Users className="w-12 h-12 text-gray-400 mx-auto mb-3" />
                                        <p className="text-gray-600">Aucun membre d'équipe</p>
                                    </div>
                                ) : (
                                    <div className="space-y-3">
                                        {teamMembers.map((member) => (
                                            <div key={member.id} className={`flex items-center justify-between p-3 bg-gray-50 rounded-lg ${isEmployee ? 'lg:p-4' : ''}`}>
                                                <div className="flex items-center gap-3">
                                                    <div className="w-10 h-10 bg-blue-100 rounded-full flex items-center justify-center">
                                                        <span className="text-blue-600 font-medium text-sm">
                                                            {member.prenom?.charAt(0)}{member.nom?.charAt(0)}
                                                        </span>
                                                    </div>
                                                    <div>
                                                        <p className="font-medium text-gray-900">{member.prenom} {member.nom}</p>
                                                        <p className="text-sm text-gray-600">{member.email}</p>
                                                    </div>
                                                </div>
                                                {!isEmployee && (
                                                    <div className="text-right">
                                                        <p className="text-sm font-medium text-gray-900">
                                                            {allRequests.filter(r => r.employee_id === member.id && r.status === 'En attente').length} en attente
                                                        </p>
                                                        <p className="text-xs text-gray-500">
                                                            {allRequests.filter(r => r.employee_id === member.id).length} total
                                                        </p>
                                                    </div>
                                                )}
                                            </div>
                                        ))}
                                    </div>
                                )}
                            </div>
                        </div>
                    </div>

                    {/* Historique des demandes */}
                    {!isEmployee && (
                        <div className="mt-6 bg-white rounded-xl shadow-sm border border-gray-100">
                            <div className="p-4 lg:p-6 border-b border-gray-100">
                                <h2 className="text-lg lg:text-xl font-semibold text-gray-900 flex items-center gap-2">
                                    <FileText className="w-5 h-5 text-gray-600" />
                                    Historique des demandes ({allRequests.length})
                                </h2>
                            </div>
                            <div className="p-4 lg:p-6">
                                {allRequests.length === 0 ? (
                                    <div className="text-center py-8">
                                        <FileText className="w-12 h-12 text-gray-400 mx-auto mb-3" />
                                        <p className="text-gray-600">Aucune demande</p>
                                    </div>
                                ) : (
                                    <div className="space-y-3 max-h-80 overflow-y-auto">
                                        {allRequests.map((request) => (
                                            <div key={request.id} className="p-3 border border-gray-100 rounded-lg hover:bg-gray-50 transition-colors">
                                                <div className="flex items-center gap-2 mb-2">
                                                    <p className="font-medium text-gray-900">{request.employee_name}</p>
                                                    <span className={`px-2 py-1 rounded-full text-xs font-medium ${getTypeColor(request.type)}`}>
                                                        {request.type}
                                                    </span>
                                                    <span className={`px-2 py-1 rounded-full text-xs font-medium ${getStatusColor(request.status)}`}>
                                                        {request.status}
                                                    </span>
                                                </div>
                                                <p className="text-sm text-gray-600">{request.date_display}</p>
                                                <p className="text-xs text-gray-500 mb-2">Soumis le {request.submitted_display}</p>

                                                {request.reason && (
                                                    <p className="text-sm text-gray-700 mb-1"><strong>Motif :</strong> {request.reason}</p>
                                                )}

                                                {request.file && (
                                                    <div className="text-sm mt-1">
                                                        <p className="text-gray-500">Document joint</p>
                                                        <a
                                                            href={`/uploads/${request.file}`}
                                                            target="_blank"
                                                            rel="noopener noreferrer"
                                                            className="text-blue-600 hover:underline flex items-center gap-1 mt-1"
                                                        >
                                                            <Eye className="w-4 h-4" />
                                                            Voir le fichier
                                                        </a>
                                                    </div>
                                                )}

                                                <div className="text-right mt-2">
                                                    <p className="font-medium text-gray-900">{request.days}j</p>
                                                </div>
                                            </div>
                                        ))}

                                    </div>
                                )}
                            </div>
                        </div>
                    )}
                </div>
            </div>

            {/* Modal de validation */}

            {showValidationModal && selectedRequest && (
                <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">
                        {/* Header */}
                        <div className="p-6 border-b border-gray-100">
                            <h3 className="text-lg font-semibold text-gray-900">
                                {validationAction === 'approve' ? 'Approuver' : 'Refuser'} la demande
                            </h3>
                        </div>

                        {/* Corps du contenu */}
                        <div className="p-6">
                            <div className="mb-4 p-4 bg-gray-50 rounded-lg">
                                <p className="font-medium text-gray-900">{selectedRequest.employee_name}</p>
                                <p className="text-sm text-gray-600">
                                    {selectedRequest.type} - {selectedRequest.date_display}
                                </p>
                                <p className="text-sm text-gray-600">{selectedRequest.days} jour(s)</p>

                                {selectedRequest.reason && (
                                    <p className="text-sm text-gray-600 mt-2">
                                        <strong>Motif:</strong> {selectedRequest.reason}
                                    </p>
                                )}

                                {selectedRequest.file && (
                                    <div>
                                        <p className="text-gray-500">Document joint</p>
                                        <a
                                            href={`/GTA/project/uploads/${selectedRequest.file}`}
                                            target="_blank"
                                            rel="noopener noreferrer"
                                            className="text-blue-600 hover:underline flex items-center gap-2"
                                        >
                                            <Eye className="w-4 h-4" />
                                            Voir le fichier
                                        </a>
                                    </div>
                                )}


                            </div>

                            {/* Champ commentaire */}
                            <div className="mb-4">
                                <label className="block text-sm font-medium text-gray-700 mb-2">
                                    Commentaire {validationAction === 'reject' ? '(obligatoire)' : '(optionnel)'}
                                </label>
                                <textarea
                                    value={validationComment}
                                    onChange={(e) => setValidationComment(e.target.value)}
                                    placeholder={validationAction === 'approve' ? 'Commentaire optionnel...' : 'Motif du refus...'}
                                    rows={3}
                                    className="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent resize-none"
                                />
                            </div>

                            {/* Boutons */}
                            <div className="flex gap-3">
                                <button
                                    onClick={() => setShowValidationModal(false)}
                                    className="flex-1 px-4 py-2 border border-gray-300 text-gray-700 rounded-lg hover:bg-gray-50 transition-colors"
                                >
                                    Annuler
                                </button>
                                <button
                                    onClick={() =>
                                        handleValidateRequest(selectedRequest.id, validationAction, validationComment)
                                    }
                                    disabled={validationAction === 'reject' && !validationComment.trim()}
                                    className={`flex-1 px-4 py-2 text-white rounded-lg transition-colors disabled:opacity-50 disabled:cursor-not-allowed ${validationAction === 'approve'
                                        ? 'bg-green-600 hover:bg-green-700'
                                        : 'bg-red-600 hover:bg-red-700'
                                        }`}
                                >
                                    {validationAction === 'approve' ? 'Approuver' : 'Refuser'}
                                </button>
                            </div>
                        </div>
                    </div>
                </div>
            )}
        </div>
    );
};

export default Collaborateur;
