const BaseService = require('./BaseService');
const cron = require('node-cron');
const os = require('os');
const fs = require('fs');
const path = require('path');
const ip = require('ip');
const si = require('systeminformation');
const fetch = require('node-fetch');
const packageJson = require('../package.json');

class ReportManagerService extends BaseService {
    constructor() {
        // Configuration par défaut
        const defaultConfig = {
            enabled: 'off',
            endpoint: 'https://cdn-apollon-p198-61m1.dinawo.fr/api/report/receive',
            cronSchedule: '0 0 * * *' // Par défaut, une fois par jour à minuit
        };
        
        super('reportManager', defaultConfig);
        this.job = null;
    }

    async _startImplementation() {
        if (this.job) {
            return;
        }

        // Valider le cron schedule
        const schedule = this.config.cronSchedule || this.defaultConfig.cronSchedule;
        if (!cron.validate(schedule)) {
            throw new Error(`Schedule cron invalide: ${schedule}`);
        }

        this.job = cron.schedule(schedule, () => this.generateAndSendReport());
        this.logger.info(`Service de rapport programmé avec le planning: ${schedule}`);
    }

    async _stopImplementation() {
        if (this.job) {
            this.job.stop();
            this.job = null;
        }
    }

    formatUptime(uptime) {
        const days = Math.floor(uptime / (24 * 60 * 60));
        uptime %= (24 * 60 * 60);
        const hours = Math.floor(uptime / (60 * 60));
        uptime %= (60 * 60);
        const minutes = Math.floor(uptime / 60);
        return `${days}d ${hours}h ${minutes}m`;
    }

    async getInternalErrors() {
        const date = new Date();
        date.setDate(date.getDate() - 1);
        const previousDate = date.toISOString().split('T')[0];
        const logFile = path.join(__dirname, '..', 'logs', `log-${previousDate}.log`);
        
        try {
            const logs = fs.readFileSync(logFile, 'utf-8');
            return logs.split('\n').filter(line => /\[38;5;9mInternal-Error/.test(line));
        } catch (err) {
            this.logger.error('Erreur lors de la lecture des logs:', err);
            return [];
        }
    }

    async generateReport() {
        try {
            const internalErrors = await this.getInternalErrors();
            
            if (internalErrors.length === 0) {
                this.logger.info('Pas d\'erreurs internes dans les logs d\'hier. Pas de rapport généré.');
                return null;
            }

            const loadavg = os.loadavg().map(load => (load / os.cpus().length) * 100);
            
            const osInfo = {
                type: os.type(),
                platform: os.platform(),
                arch: os.arch(),
                release: os.release(),
                uptime: this.formatUptime(os.uptime()),
                loadavg: loadavg
            };

            const networkInterfaces = os.networkInterfaces();
            const diskUsage = await si.fsSize();
            const cpuTemperature = await si.cpuTemperature();
            const userInfo = os.userInfo();

            const systemInfo = {
                memoryInfo: ((os.totalmem() - os.freemem()) / os.totalmem() * 100).toFixed(2),
                cpuInfo: (os.cpus().length / os.cpus().length * 100).toFixed(2),
                diskInfo: diskUsage.map(disk => ({
                    fs: disk.fs,
                    type: disk.type,
                    size: disk.size,
                    used: disk.used,
                    available: disk.available,
                    use: disk.use
                })),
                ipAddress: ip.address(),
                cdnVersion: packageJson.version,
                osInfo: osInfo,
                userInfo: {
                    username: userInfo.username,
                    homedir: userInfo.homedir,
                    shell: userInfo.shell
                },
                errors: internalErrors,
                networkInterfaces: networkInterfaces,
                serverUptime: os.uptime(),
                systemLoad: loadavg,
                cpuTemperature: cpuTemperature
            };

            const reportDate = new Date();
            reportDate.setDate(reportDate.getDate() - 1);
            const reportFileName = `report_${reportDate.toISOString().split('T')[0]}_${ip.address()}.json`;
            
            // Sauvegarder le rapport localement
            const reportDir = path.join(__dirname, '..', 'report');
            if (!fs.existsSync(reportDir)) {
                fs.mkdirSync(reportDir, { recursive: true });
            }
            
            fs.writeFileSync(
                path.join(reportDir, reportFileName),
                JSON.stringify(systemInfo, null, 2)
            );

            return systemInfo;
        } catch (error) {
            this.logger.error('Erreur lors de la génération du rapport:', error);
            throw error;
        }
    }

    async generateAndSendReport() {
        try {
            const report = await this.generateReport();
            
            if (!report) {
                return;
            }

            this.logger.info("Envoi du rapport...");
            
            const response = await fetch(this.config.endpoint, {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json'
                },
                body: JSON.stringify(report)
            });

            if (!response.ok) {
                throw new Error(`Erreur HTTP! statut: ${response.status}`);
            }

            const responseData = await response.json();
            this.logger.info('Rapport envoyé avec succès. Réponse:', responseData);
            
            return responseData;
        } catch (error) {
            this.logger.error('Échec de l\'envoi du rapport:', error);
            throw error;
        }
    }

    // Méthode pour forcer l'envoi d'un rapport immédiatement
    async forceSendReport() {
        return this.generateAndSendReport();
    }
}

module.exports = new ReportManagerService();