const { Collection } = require("discord.js");

class TransactionHandler {

    constructor(client) {

        this.client = client;
        this.transactions = new Collection();

        process.on('message', (message) => {
            if(message._storage) this._receive(message);
        });

    }

    _receive(message) {

        if(!message.transactionID) return;
        const transaction = this.transactions.get(message.transactionID);
        
        if(message.error) transaction.reject(message.message);
        else transaction.resolve(message.result);

    }

    _send(message, options = {}) {

        return new Promise((resolve, reject) => {
            
            const ID = this.transactionID;
            this.transactions.set(ID, { id: ID, resolve, reject } );

            process.send({ _storage: true, transactionID: ID, ...message, ...options });

        });

    }

    get transactionID() {
        return `${[ this.client.shard.ids ]}-${Date.now().toString(36)}`;
    }

}

module.exports = TransactionHandler;