const GatewayConnection = require('./gatewayconnection');
const fetch = require('node-fetch');

class Client {
    constructor(url, config={}) {
        this.token = null;
        this.user = null;
        this.isLoggedIn = false;

        this.url = url;
        this.config = config;

        this.gateway = null;
    }
}

Client.prototype.gatewayConnect = async function() {
    if (!this.token) throw new Error('Attempt to connect to gateway without being authenticated');

    this.gateway = new GatewayConnection(this.url);
    this.gateway.connect(this.token);
};

Client.prototype.gatewayDisconnect = async function() {
    if (this.gateway) this.gateway.disconnect();
    this.gateway = null;
};

Client.prototype.sendAuthenticatedRequest = async function(endpoint, options) {
    if (!this.token) throw new Error('Attempt to send authenticated request without being authenticated');

    options.headers = {
        cookie: `token=${this.token}`,
        ...options.headers
    };

    let res;
    let json;
    let isOK = false;

    try {
        res = await fetch(`${this.url}${endpoint}`, options);
        json = await res.json();
    } catch(e) {
        throw new Error(`Request to ${endpoint} failed with error`, e);
    }

    if (res.ok && !json.error) {
        isOK = true;
    } else {
        if (this.config.throwErrors) {
            throw new Error(`Request to ${endpoint} failed with status ${res.status}`);
        }
    }

    return { res, json, isOK };
};

Client.prototype.setToken = async function(token) {
    this.token = token;

    const { json, isOK } = await this.sendAuthenticatedRequest('/api/v1/users/current/info', {
        method: 'GET',
        headers: {
            'Accept': 'application/json',
        }
    });

    if (!isOK) throw new Error('Failed to get user info for setToken');

    this.user = json.user;
    this.userLoggedIn = true;

    console.log(`[*] Logged in as ${this.user.username}`);
};

Client.prototype.unsetToken = async function() {
    this.token = null;
    this.user = null;
    this.gatewayDisconnect();
    this.userLoggedIn = false;
};

module.exports = Client;