'use client';

import React, { useState, useEffect } from 'react';
import { Card } from 'primereact/card';
import { Chart } from 'primereact/chart';
import { Button } from 'primereact/button';
import { Toolbar } from 'primereact/toolbar';
import { DataTable } from 'primereact/datatable';
import { Column } from 'primereact/column';
import { Tag } from 'primereact/tag';
import { Badge } from 'primereact/badge';
import { ProgressBar } from 'primereact/progressbar';
import { useRouter } from 'next/navigation';
import { apiClient } from '../../../../services/api-client';

interface StatistiquesEquipes {
    totalEquipes: number;
    equipesActives: number;
    equipesInactives: number;
    equipesDisponibles: number;
    equipesEnMission: number;
    repartitionParSpecialite: { [key: string]: number };
    tauxOccupationMoyen: number;
    tauxOccupationParSpecialite: { [key: string]: number };
    performanceMoyenne: number;
    performanceParSpecialite: { [key: string]: number };
    coutMoyenJournalier: number;
    coutParSpecialite: { [key: string]: number };
    nombreEmployesMoyen: number;
    repartitionTailleEquipes: { [key: string]: number };
    topEquipesPerformantes: Array<{
        id: number;
        nom: string;
        specialite: string;
        evaluationPerformance: number;
        nombreMissions: number;
        tauxReussite: number;
    }>;
    equipesProblematiques: Array<{
        id: number;
        nom: string;
        specialite: string;
        problemes: string[];
        tauxOccupation: number;
    }>;
    evolutionMensuelle: Array<{
        mois: string;
        nombreEquipes: number;
        tauxOccupation: number;
        performanceMoyenne: number;
    }>;
}

const StatistiquesEquipesPage = () => {
    const [stats, setStats] = useState<StatistiquesEquipes | null>(null);
    const [loading, setLoading] = useState(true);
    const [chartOptions] = useState({
        responsive: true,
        maintainAspectRatio: false,
        plugins: {
            legend: {
                position: 'bottom'
            }
        }
    });
    const router = useRouter();

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

    const loadStatistiques = async () => {
        try {
            setLoading(true);
            console.log('🔄 Chargement des statistiques équipes...');
            const response = await apiClient.get('/api/equipes/statistiques');
            console.log('✅ Statistiques équipes chargées:', response.data);
            setStats(response.data);
        } catch (error) {
            console.error('❌ Erreur lors du chargement des statistiques:', error);
        } finally {
            setLoading(false);
        }
    };

    const getStatutChartData = () => {
        if (!stats) return {};

        return {
            labels: ['Actives', 'Disponibles', 'En mission', 'Inactives'],
            datasets: [{
                data: [
                    stats.equipesActives,
                    stats.equipesDisponibles,
                    stats.equipesEnMission,
                    stats.equipesInactives
                ],
                backgroundColor: [
                    '#4CAF50',
                    '#2196F3',
                    '#FF9800',
                    '#F44336'
                ],
                borderWidth: 2
            }]
        };
    };

    const getSpecialiteChartData = () => {
        if (!stats) return {};

        return {
            labels: Object.keys(stats.repartitionParSpecialite),
            datasets: [{
                data: Object.values(stats.repartitionParSpecialite),
                backgroundColor: [
                    '#FF6384',
                    '#36A2EB',
                    '#FFCE56',
                    '#4BC0C0',
                    '#9966FF',
                    '#FF9F40',
                    '#FF6384',
                    '#C9CBCF'
                ],
                borderWidth: 2
            }]
        };
    };

    const getOccupationChartData = () => {
        if (!stats) return {};

        return {
            labels: Object.keys(stats.tauxOccupationParSpecialite),
            datasets: [{
                label: 'Taux d\'occupation (%)',
                data: Object.values(stats.tauxOccupationParSpecialite),
                backgroundColor: '#36A2EB',
                borderColor: '#36A2EB',
                borderWidth: 1
            }]
        };
    };

    const getEvolutionChartData = () => {
        if (!stats) return {};

        return {
            labels: stats.evolutionMensuelle.map(e => e.mois),
            datasets: [
                {
                    label: 'Nombre d\'équipes',
                    data: stats.evolutionMensuelle.map(e => e.nombreEquipes),
                    borderColor: '#4CAF50',
                    backgroundColor: 'rgba(76, 175, 80, 0.1)',
                    yAxisID: 'y'
                },
                {
                    label: 'Taux d\'occupation (%)',
                    data: stats.evolutionMensuelle.map(e => e.tauxOccupation),
                    borderColor: '#FF9800',
                    backgroundColor: 'rgba(255, 152, 0, 0.1)',
                    yAxisID: 'y1'
                }
            ]
        };
    };

    const getEvolutionChartOptions = () => {
        return {
            ...chartOptions,
            scales: {
                y: {
                    type: 'linear',
                    display: true,
                    position: 'left',
                },
                y1: {
                    type: 'linear',
                    display: true,
                    position: 'right',
                    grid: {
                        drawOnChartArea: false,
                    },
                },
            }
        };
    };

    const performanceBodyTemplate = (rowData: any) => {
        return (
            <div className="flex align-items-center gap-2">
                <Tag value={`${rowData.evaluationPerformance}/5`} severity="success" />
                <div className="flex">
                    {[1, 2, 3, 4, 5].map((star) => (
                        <i
                            key={star}
                            className={`pi pi-star${star <= rowData.evaluationPerformance ? '-fill' : ''} text-yellow-500`}
                            style={{ fontSize: '0.8rem' }}
                        />
                    ))}
                </div>
            </div>
        );
    };

    const tauxReussiteBodyTemplate = (rowData: any) => {
        const getColor = (taux: number) => {
            if (taux >= 90) return 'success';
            if (taux >= 75) return 'info';
            if (taux >= 60) return 'warning';
            return 'danger';
        };

        return (
            <div className="flex align-items-center gap-2">
                <Tag value={`${rowData.tauxReussite}%`} severity={getColor(rowData.tauxReussite)} />
                <ProgressBar value={rowData.tauxReussite} className="w-6rem" />
            </div>
        );
    };

    const problemesBodyTemplate = (rowData: any) => {
        return (
            <div className="flex flex-wrap gap-1">
                {rowData.problemes?.slice(0, 2).map((probleme: string, index: number) => (
                    <Tag key={index} value={probleme} severity="danger" className="p-tag-sm" />
                ))}
                {rowData.problemes?.length > 2 && (
                    <Badge value={`+${rowData.problemes.length - 2}`} severity="danger" />
                )}
            </div>
        );
    };

    const actionBodyTemplate = (rowData: any) => {
        return (
            <Button
                icon="pi pi-eye"
                className="p-button-rounded p-button-info p-button-sm"
                onClick={() => router.push(`/equipes/${rowData.id}`)}
                tooltip="Voir détails"
            />
        );
    };

    const leftToolbarTemplate = () => {
        return (
            <div className="flex flex-wrap gap-2">
                <Button
                    label="Retour aux équipes"
                    icon="pi pi-arrow-left"
                    className="p-button-outlined"
                    onClick={() => router.push('/equipes')}
                />
                <Button
                    label="Export PDF"
                    icon="pi pi-file-pdf"
                    className="p-button-danger"
                    onClick={() => console.log('Export PDF')}
                />
                <Button
                    label="Export Excel"
                    icon="pi pi-file-excel"
                    className="p-button-success"
                    onClick={() => console.log('Export Excel')}
                />
            </div>
        );
    };

    const rightToolbarTemplate = () => {
        return (
            <Button
                icon="pi pi-refresh"
                className="p-button-outlined"
                onClick={loadStatistiques}
                tooltip="Actualiser"
            />
        );
    };

    if (loading) {
        return (
            <div className="grid">
                <div className="col-12">
                    <Card>
                        <div className="flex justify-content-center">
                            <i className="pi pi-spin pi-spinner" style={{ fontSize: '2rem' }} />
                        </div>
                    </Card>
                </div>
            </div>
        );
    }

    if (!stats) {
        return (
            <div className="grid">
                <div className="col-12">
                    <Card>
                        <div className="text-center">
                            <p>Aucune donnée disponible</p>
                        </div>
                    </Card>
                </div>
            </div>
        );
    }

    return (
        <div className="grid">
            <div className="col-12">
                <Toolbar 
                    className="mb-4" 
                    left={leftToolbarTemplate} 
                    right={rightToolbarTemplate}
                />
            </div>

            {/* Métriques principales */}
            <div className="col-12 lg:col-3 md:col-6">
                <Card className="bg-blue-100">
                    <div className="flex justify-content-between align-items-center">
                        <div>
                            <span className="block text-500 font-medium mb-3">Total Équipes</span>
                            <div className="text-900 font-medium text-xl">{stats.totalEquipes}</div>
                        </div>
                        <div className="flex align-items-center justify-content-center bg-blue-500 border-round" style={{ width: '2.5rem', height: '2.5rem' }}>
                            <i className="pi pi-users text-white text-xl" />
                        </div>
                    </div>
                </Card>
            </div>

            <div className="col-12 lg:col-3 md:col-6">
                <Card className="bg-green-100">
                    <div className="flex justify-content-between align-items-center">
                        <div>
                            <span className="block text-500 font-medium mb-3">Équipes Actives</span>
                            <div className="text-900 font-medium text-xl">{stats.equipesActives}</div>
                        </div>
                        <div className="flex align-items-center justify-content-center bg-green-500 border-round" style={{ width: '2.5rem', height: '2.5rem' }}>
                            <i className="pi pi-check-circle text-white text-xl" />
                        </div>
                    </div>
                </Card>
            </div>

            <div className="col-12 lg:col-3 md:col-6">
                <Card className="bg-orange-100">
                    <div className="flex justify-content-between align-items-center">
                        <div>
                            <span className="block text-500 font-medium mb-3">Taux Occupation</span>
                            <div className="text-900 font-medium text-xl">{stats.tauxOccupationMoyen}%</div>
                        </div>
                        <div className="flex align-items-center justify-content-center bg-orange-500 border-round" style={{ width: '2.5rem', height: '2.5rem' }}>
                            <i className="pi pi-chart-pie text-white text-xl" />
                        </div>
                    </div>
                </Card>
            </div>

            <div className="col-12 lg:col-3 md:col-6">
                <Card className="bg-purple-100">
                    <div className="flex justify-content-between align-items-center">
                        <div>
                            <span className="block text-500 font-medium mb-3">Performance Moyenne</span>
                            <div className="text-900 font-medium text-xl">{stats.performanceMoyenne}/5</div>
                        </div>
                        <div className="flex align-items-center justify-content-center bg-purple-500 border-round" style={{ width: '2.5rem', height: '2.5rem' }}>
                            <i className="pi pi-star text-white text-xl" />
                        </div>
                    </div>
                </Card>
            </div>

            {/* Graphiques */}
            <div className="col-12 lg:col-6">
                <Card title="Répartition par Statut">
                    <Chart type="doughnut" data={getStatutChartData()} options={chartOptions} style={{ height: '300px' }} />
                </Card>
            </div>

            <div className="col-12 lg:col-6">
                <Card title="Répartition par Spécialité">
                    <Chart type="pie" data={getSpecialiteChartData()} options={chartOptions} style={{ height: '300px' }} />
                </Card>
            </div>

            <div className="col-12">
                <Card title="Taux d'Occupation par Spécialité">
                    <Chart type="bar" data={getOccupationChartData()} options={chartOptions} style={{ height: '300px' }} />
                </Card>
            </div>

            <div className="col-12">
                <Card title="Évolution Mensuelle">
                    <Chart type="line" data={getEvolutionChartData()} options={getEvolutionChartOptions()} style={{ height: '300px' }} />
                </Card>
            </div>

            {/* Tableaux de données */}
            <div className="col-12 lg:col-6">
                <Card title="Top Équipes Performantes">
                    <DataTable value={stats.topEquipesPerformantes} responsiveLayout="scroll">
                        <Column field="nom" header="Nom" />
                        <Column field="specialite" header="Spécialité" />
                        <Column field="evaluationPerformance" header="Performance" body={performanceBodyTemplate} />
                        <Column field="nombreMissions" header="Missions" />
                        <Column field="tauxReussite" header="Taux réussite" body={tauxReussiteBodyTemplate} />
                        <Column body={actionBodyTemplate} header="Actions" />
                    </DataTable>
                </Card>
            </div>

            <div className="col-12 lg:col-6">
                <Card title="Équipes Problématiques">
                    <DataTable value={stats.equipesProblematiques} responsiveLayout="scroll">
                        <Column field="nom" header="Nom" />
                        <Column field="specialite" header="Spécialité" />
                        <Column field="problemes" header="Problèmes" body={problemesBodyTemplate} />
                        <Column 
                            field="tauxOccupation" 
                            header="Occupation" 
                            body={(rowData) => <Tag value={`${rowData.tauxOccupation}%`} severity="warning" />}
                        />
                        <Column body={actionBodyTemplate} header="Actions" />
                    </DataTable>
                </Card>
            </div>

            {/* Informations supplémentaires */}
            <div className="col-12">
                <Card title="Informations Complémentaires">
                    <div className="grid">
                        <div className="col-12 md:col-3">
                            <div className="text-center">
                                <i className="pi pi-users text-4xl text-blue-500 mb-3" />
                                <h4>Taille Moyenne</h4>
                                <p className="text-600">
                                    {stats.nombreEmployesMoyen} employés par équipe
                                </p>
                            </div>
                        </div>
                        <div className="col-12 md:col-3">
                            <div className="text-center">
                                <i className="pi pi-euro text-4xl text-green-500 mb-3" />
                                <h4>Coût Moyen</h4>
                                <p className="text-600">
                                    {stats.coutMoyenJournalier.toLocaleString('fr-FR')} €/jour
                                </p>
                            </div>
                        </div>
                        <div className="col-12 md:col-3">
                            <div className="text-center">
                                <i className="pi pi-check-circle text-4xl text-orange-500 mb-3" />
                                <h4>Disponibles</h4>
                                <p className="text-600">
                                    {stats.equipesDisponibles} équipes disponibles
                                </p>
                            </div>
                        </div>
                        <div className="col-12 md:col-3">
                            <div className="text-center">
                                <i className="pi pi-clock text-4xl text-purple-500 mb-3" />
                                <h4>En Mission</h4>
                                <p className="text-600">
                                    {stats.equipesEnMission} équipes en mission
                                </p>
                            </div>
                        </div>
                    </div>
                </Card>
            </div>
        </div>
    );
};

export default StatistiquesEquipesPage;