const fs = require('fs');
const path = require('path');

module.exports = class {
    constructor() {
        this.map = new Map();
        this.loadData();
    }
    
    loadData() {
        const dir = path.join(path.dirname(__dirname), '../datastore');
        if (!fs.existsSync(dir)) {
            fs.mkdirSync(dir);
        }
        //console.log("");
        const dataFiles = fs.readdirSync(path.join(path.dirname(__dirname), '../datastore')).filter(f => f.endsWith('.json'));
        for (const file of dataFiles) {
            try {
                const json = require(`../../datastore/${file}`);
                this.map.set(json.guild.id, json);
                //console.log('[LOADED] ' + file + " (" + json.guild.id + ")");
                //console.log(JSON.stringify(json, null, 4));
            } catch (error) {
                //console.log('[ERROR] Loading ' + file + ' failed');
            }
        }
        //console.log("");
    }

    calculateGlobal(client){
        let guilds = this.map.keys();
        let stations = client.stations;
        var statistics = {};

        if(!client.stations) return;
        
        let calculation = guilds.next();

        while (!calculation.done) {
            let currentGuild = this.getEntry(calculation.value);
            if(calculation.value != 'global'){
                if(stations){
                    Object.keys(stations).forEach(function(station) {
                        if(currentGuild.statistics[stations[station].name] && currentGuild.statistics[stations[station].name].time && parseInt(currentGuild.statistics[stations[station].name].time) != 0  && currentGuild.statistics[stations[station].name].used && parseInt(currentGuild.statistics[stations[station].name].used) != 0){
                            if(!statistics[stations[station].name]){
                                statistics[stations[station].name] = {};
                                statistics[stations[station].name].time = 0;
                                statistics[stations[station].name].used = 0;
                            }
                        
                            statistics[stations[station].name].time = parseInt(statistics[stations[station].name].time)+parseInt(currentGuild.statistics[stations[station].name].time);
                            statistics[stations[station].name].used = parseInt(statistics[stations[station].name].used)+parseInt(currentGuild.statistics[stations[station].name].used);
                        }
                    });
                }
            }
            calculation = guilds.next();
        }

        let newData = {};
        newData.guild = {};
        newData.guild.id = "global";
        newData.guild.name = "global";
        newData.statistics = statistics;
        this.updateEntry(newData.guild, newData);
    }


    checkEntry(id){
        if(!this.map.has(id)){
            this.createEntry(id);
            //this.showEntry(this.getEntry(id));
        } else {
            //this.showEntry(this.getEntry(id));
        }
    }

    createEntry(id){
        let newData = {};
        newData.guild = {};
        newData.guild.id = id;
        newData.statistics = {};
        newData.state = {};
        this.map.set(id, newData);
        this.saveEntry(id, newData);
    }
    
    getEntry(id){
        return this.map.get(id);
    }
    
    updateEntry(guild, newData) {
        newData.guild.name = guild.name;

        let date = new Date();
        newData.updated = date.toISOString().substring(0, 10)
        
        this.map.set(guild.id, newData);
        this.saveEntry(guild.id, newData);
        //this.showEntry(this.getEntry(guild.id));
    }
    
    showEntry(data){
        console.log(data);
    }
    
    createTestFile () {
        let newData = {
            "guild": {
                "id": "test",
                "name": "Test"
            },
            "statistics": {
                "test": {
                    "time": 0,
                    "used": 0
                }
            },
            "state": {

            }
        }
        
        this.updateEntry(newData.guild, newData);
    }
    
    saveEntry(file, data) {
        data = JSON.stringify(data, null, 4);

        fs.writeFile(path.join(path.dirname(__dirname), '../datastore') + "/" + file + ".json", data, 'utf8', function(err) {
            if (err) {
                //console.log(err);
            }
        });
    }
};