const StdLib = require('@doctormckay/stdlib');

const SteamCommunity = require('../index.js');

const Helpers = require('./helpers.js');

/**
 * @param {string} domain
 * @param {function} [callback]
 * @return Promise<{key: string}>
 */
SteamCommunity.prototype.getWebApiKey = function(domain, callback) {
	return StdLib.Promises.callbackPromise(['key'], callback, false, async (resolve, reject) => {
		let {textBody} = await this.httpRequest({
			method: 'GET',
			url: 'https://steamcommunity.com/dev/apikey?l=english',
			followRedirect: false,
			source: 'steamcommunity'
		});

		if (textBody.includes('<h2>Access Denied</h2>')) {
			return reject(new Error('Access Denied'));
		}

		if (textBody.includes('You must have a validated email address to create a Steam Web API key.')) {
			return reject(new Error('You must have a validated email address to create a Steam Web API key.'));
		}

		let match = textBody.match(/<p>Key: ([0-9A-F]+)<\/p>/);
		if (match) {
			// We already have an API key registered
			return resolve({key: match[1]});
		}

		// We need to register a new API key
		await this.httpRequest({
			method: 'POST',
			url: 'https://steamcommunity.com/dev/registerkey?l=english',
			form: {
				domain,
				agreeToTerms: 'agreed',
				sessionid: this.getSessionID(),
				Submit: 'Register'
			},
			source: 'steamcommunity'
		});

		resolve({key: await this.getWebApiKey(domain)});
	});
};

/**
 * Sets an access_token generated by steam-session using EAuthTokenPlatformType.MobileApp.
 * Required for some operations such as 2FA enabling and disabling.
 * This will throw an Error if the provided token is not valid, was not generated for the MobileApp platform, is expired,
 * or does not belong to the logged-in user account.
 *
 * @param {string} token
 */
SteamCommunity.prototype.setMobileAppAccessToken = function(token) {
	if (!this.steamID) {
		throw new Error('Log on to steamcommunity before setting a mobile app access token');
	}

	let decodedToken = Helpers.decodeJwt(token);

	if (!decodedToken.iss || !decodedToken.sub || !decodedToken.aud || !decodedToken.exp) {
		throw new Error('Provided value is not a valid Steam access token');
	}

	if (decodedToken.iss == 'steam') {
		throw new Error('Provided token is a refresh token, not an access token');
	}

	if (decodedToken.sub != this.steamID.getSteamID64()) {
		throw new Error(`Provided token belongs to account ${decodedToken.sub}, but we are logged into ${this.steamID.getSteamID64()}`);
	}

	if (decodedToken.exp < Math.floor(Date.now() / 1000)) {
		throw new Error('Provided token is expired');
	}

	if ((decodedToken.aud || []).indexOf('mobile') == -1) {
		throw new Error('Provided token is not valid for MobileApp platform type');
	}

	this.mobileAccessToken = token;
};

/**
 * Verifies that the mobile access token we already have set is still valid for current login.
 *
 * @private
 */
SteamCommunity.prototype._verifyMobileAccessToken = function() {
	if (!this.mobileAccessToken) {
		// No access token, so nothing to do here.
		return;
	}

	let decodedToken = Helpers.decodeJwt(this.mobileAccessToken);

	let isTokenInvalid = decodedToken.sub != this.steamID.getSteamID64()    // SteamID doesn't match
		|| decodedToken.exp < Math.floor(Date.now() / 1000);                      // Token is expired

	if (isTokenInvalid) {
		delete this.mobileAccessToken;
	}
};