/*
 * decaffeinate suggestions:
 * DS205: Consider reworking code to avoid use of IIFEs
 * DS207: Consider shorter variations of null checks
 * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
 */
let allTexLiveDockerImageNames, allTexLiveDockerImages, redisConfig, siteUrl;
let e;
const Path = require('path');

// These credentials are used for authenticating api requests
// between services that may need to go over public channels
const httpAuthUser = "sharelatex";
const httpAuthPass = process.env["WEB_API_PASSWORD"];
const httpAuthUsers = {};
httpAuthUsers[httpAuthUser] = httpAuthPass;

const parse = function(option){
	if (option != null) {
		try {
			const opt = JSON.parse(option);
			return opt;
		} catch (err) {
			throw new Error(`problem parsing ${option}, invalid JSON`);
		}
	}
};

const parseIntOrFail = function(value){
	const parsedValue = parseInt(value, 10);
	if (isNaN(parsedValue)) {
		throw new Error(`'${value}' is an invalid integer`);
	}
	return parsedValue;
};

const DATA_DIR = '/var/lib/sharelatex/data';
const TMP_DIR = '/var/lib/sharelatex/tmp';

const settings = {

	clsi: {
		optimiseInDocker: process.env['OPTIMISE_PDF'] === 'true'
	},

	brandPrefix: "",

	allowAnonymousReadAndWriteSharing:
		process.env['SHARELATEX_ALLOW_ANONYMOUS_READ_AND_WRITE_SHARING'] === 'true',

	// Databases
	// ---------

	// ShareLaTeX's main persistent data store is MongoDB (http://www.mongodb.org/)
	// Documentation about the URL connection string format can be found at:
	//
	//    http://docs.mongodb.org/manual/reference/connection-string/
	//
	// The following works out of the box with Mongo's default settings:
	mongo: {
		url : process.env["SHARELATEX_MONGO_URL"] || 'mongodb://dockerhost/sharelatex'
	},

	// Redis is used in ShareLaTeX for high volume queries, like real-time
	// editing, and session management.
	//
	// The following config will work with Redis's default settings:
	redis: {
		web: (redisConfig = {
			host: process.env["SHARELATEX_REDIS_HOST"] || "dockerhost",
			port: process.env["SHARELATEX_REDIS_PORT"] || "6379",
			password: process.env["SHARELATEX_REDIS_PASS"] || undefined,
			key_schema: {
				// document-updater
				blockingKey({doc_id}) { return `Blocking:${doc_id}`; },
				docLines({doc_id}) { return `doclines:${doc_id}`; },
				docOps({doc_id}) { return `DocOps:${doc_id}`; },
				docVersion({doc_id}) { return `DocVersion:${doc_id}`; },
				docHash({doc_id}) { return `DocHash:${doc_id}`; },
				projectKey({doc_id}) { return `ProjectId:${doc_id}`; },
				docsInProject({project_id}) { return `DocsIn:${project_id}`; },
				ranges({doc_id}) { return `Ranges:${doc_id}`; },
				// document-updater:realtime
				pendingUpdates({doc_id}) { return `PendingUpdates:${doc_id}`; },
				// document-updater:history
				uncompressedHistoryOps({doc_id}) { return `UncompressedHistoryOps:${doc_id}`; },
				docsWithHistoryOps({project_id}) { return `DocsWithHistoryOps:${project_id}`; },
				// document-updater:lock
				blockingKey({doc_id}) { return `Blocking:${doc_id}`; },
				// track-changes:lock
				historyLock({doc_id}) { return `HistoryLock:${doc_id}`; },
				historyIndexLock({project_id}) { return `HistoryIndexLock:${project_id}`; },
				// track-changes:history
				uncompressedHistoryOps({doc_id}) { return `UncompressedHistoryOps:${doc_id}`; },
				docsWithHistoryOps({project_id}) { return `DocsWithHistoryOps:${project_id}`; },
				// realtime
				clientsInProject({project_id}) { return `clients_in_project:${project_id}`; },
				connectedUser({project_id, client_id}){ return `connected_user:${project_id}:${client_id}`; }
			}
		}),
		fairy: redisConfig,
		// track-changes and document-updater
		realtime: redisConfig,
		documentupdater: redisConfig,
		lock: redisConfig,
		history: redisConfig,
		websessions: redisConfig,
		api: redisConfig,
		pubsub: redisConfig,
		project_history: redisConfig
	},

	// The compile server (the clsi) uses a SQL database to cache files and
	// meta-data. sqlite is the default, and the load is low enough that this will
	// be fine in production (we use sqlite at sharelatex.com).
	//
	// If you want to configure a different database, see the Sequelize documentation
	// for available options:
	//
	//    https://github.com/sequelize/sequelize/wiki/API-Reference-Sequelize#example-usage
	//
	mysql: {
		clsi: {
			database: "clsi",
			username: "clsi",
			password: "",
			dialect: "sqlite",
			storage: Path.join(DATA_DIR, "db.sqlite")
		}
	},

	// File storage
	// ------------

	// ShareLaTeX can store binary files like images either locally or in Amazon
	// S3. The default is locally:
	filestore: {
		backend: "fs",
		stores: {
			user_files: Path.join(DATA_DIR, "user_files"),
			template_files: Path.join(DATA_DIR, "template_files")
		}
	},

	// To use Amazon S3 as a storage backend, comment out the above config, and
	// uncomment the following, filling in your key, secret, and bucket name:
	//
	// filestore:
	// 	backend: "s3"
	// 	stores:
	// 		user_files: "BUCKET_NAME"
	// 	s3:
	// 		key: "AWS_KEY"
	// 		secret: "AWS_SECRET"
	//

	trackchanges: {
		continueOnError: true
	},

	// Local disk caching
	// ------------------
	path: {
		// If we ever need to write something to disk (e.g. incoming requests
		// that need processing but may be too big for memory), then write
		// them to disk here:
		dumpFolder:   Path.join(TMP_DIR, "dumpFolder"),
		// Where to write uploads before they are processed
		uploadFolder: Path.join(TMP_DIR, "uploads"),
		// Where to write the project to disk before running LaTeX on it
		compilesDir:  Path.join(DATA_DIR, "compiles"),
		// Where to cache downloaded URLs for the CLSI
		clsiCacheDir: Path.join(DATA_DIR, "cache"),
		// Where to write the output files to disk after running LaTeX
		outputDir:  Path.join(DATA_DIR, "output")
	},

	// Server Config
	// -------------

	// Where your instance of ShareLaTeX can be found publicly. This is used
	// when emails are sent out and in generated links:
	siteUrl: (siteUrl = process.env["SHARELATEX_SITE_URL"] || 'http://localhost'),

	// The name this is used to describe your ShareLaTeX Installation
	appName: process.env["SHARELATEX_APP_NAME"] || "ShareLaTeX (Community Edition)",

	restrictInvitesToExistingAccounts: process.env["SHARELATEX_RESTRICT_INVITES_TO_EXISTING_ACCOUNTS"] === 'true',

	nav: {
		title: process.env["SHARELATEX_NAV_TITLE"] ||  process.env["SHARELATEX_APP_NAME"] || "ShareLaTeX Community Edition"
	},


	// The email address which users will be directed to as the main point of
	// contact for this installation of ShareLaTeX.
	adminEmail: process.env["SHARELATEX_ADMIN_EMAIL"] || "placeholder@example.com",

	// If provided, a sessionSecret is used to sign cookies so that they cannot be
	// spoofed. This is recommended.
	security: {
		sessionSecret: process.env["SHARELATEX_SESSION_SECRET"] || process.env["CRYPTO_RANDOM"]
	},

	// These credentials are used for authenticating api requests
	// between services that may need to go over public channels
	httpAuthUsers,

	// Should javascript assets be served minified or not.
	useMinifiedJs: true,

	// Should static assets be sent with a header to tell the browser to cache
	// them. This should be false in development where changes are being made,
	// but should be set to true in production.
	cacheStaticAssets: true,

	// If you are running ShareLaTeX over https, set this to true to send the
	// cookie with a secure flag (recommended).
	secureCookie: (process.env["SHARELATEX_SECURE_COOKIE"] != null),

	// If you are running ShareLaTeX behind a proxy (like Apache, Nginx, etc)
	// then set this to true to allow it to correctly detect the forwarded IP
	// address and http/https protocol information.

	behindProxy: process.env["SHARELATEX_BEHIND_PROXY"] || false,

	i18n: {
		subdomainLang: {
			www: {lngCode:process.env["SHARELATEX_SITE_LANGUAGE"] || "en", url: siteUrl}
		},
		defaultLng: process.env["SHARELATEX_SITE_LANGUAGE"] || "en"
	},

	currentImageName: process.env["TEX_LIVE_DOCKER_IMAGE"],

	apis: {
		web: {
			url: "http://localhost:3000",
			user: httpAuthUser,
			pass: httpAuthPass
		},
		project_history: {
			enabled: false
		}
	},
	references:{},
	notifications:undefined,

	defaultFeatures: {
		collaborators: -1,
		dropbox: true,
		versioning: true,
		compileTimeout: parseIntOrFail(process.env["COMPILE_TIMEOUT"] || 180),
		compileGroup: "standard",
		trackChanges: true,
		templates: true,
		references: true
	}
};

//# OPTIONAL CONFIGURABLE SETTINGS

if (process.env["SHARELATEX_LEFT_FOOTER"] != null) {
	try {
		settings.nav.left_footer = JSON.parse(process.env["SHARELATEX_LEFT_FOOTER"]);
	} catch (error) {
		e = error;
		console.error("could not parse SHARELATEX_LEFT_FOOTER, not valid JSON");
	}
}

if (process.env["SHARELATEX_RIGHT_FOOTER"] != null) {
	settings.nav.right_footer = process.env["SHARELATEX_RIGHT_FOOTER"];
	try {
		settings.nav.right_footer = JSON.parse(process.env["SHARELATEX_RIGHT_FOOTER"]);
	} catch (error1) {
		e = error1;
		console.error("could not parse SHARELATEX_RIGHT_FOOTER, not valid JSON");
	}
}

if (process.env["SHARELATEX_HEADER_IMAGE_URL"] != null) {
	settings.nav.custom_logo = process.env["SHARELATEX_HEADER_IMAGE_URL"];
}

if (process.env["SHARELATEX_HEADER_NAV_LINKS"] != null) {
	console.error(`\
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
#
#  WARNING: SHARELATEX_HEADER_NAV_LINKS is no longer supported
#  See https://github.com/sharelatex/sharelatex/wiki/Configuring-Headers,-Footers-&-Logo
#
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #\
`
	);
}

if (process.env["SHARELATEX_HEADER_EXTRAS"] != null) {
	try {
		settings.nav.header_extras = JSON.parse(process.env["SHARELATEX_HEADER_EXTRAS"]);
	} catch (error2) {
		e = error2;
		console.error("could not parse SHARELATEX_HEADER_EXTRAS, not valid JSON");
	}
}



// Sending Email
// -------------
//
// You must configure a mail server to be able to send invite emails from
// ShareLaTeX. The config settings are passed to nodemailer. See the nodemailer
// documentation for available options:
//
//     http://www.nodemailer.com/docs/transports


if (process.env["SHARELATEX_EMAIL_FROM_ADDRESS"] != null) {

	settings.email = {
		fromAddress: process.env["SHARELATEX_EMAIL_FROM_ADDRESS"],
		replyTo: process.env["SHARELATEX_EMAIL_REPLY_TO"] || "",
		driver: process.env["SHARELATEX_EMAIL_DRIVER"],
		parameters: {
			//AWS Creds
			AWSAccessKeyID: process.env["SHARELATEX_EMAIL_AWS_SES_ACCESS_KEY_ID"],
			AWSSecretKey: process.env["SHARELATEX_EMAIL_AWS_SES_SECRET_KEY"],

			//SMTP Creds
			host: process.env["SHARELATEX_EMAIL_SMTP_HOST"],
			port: process.env["SHARELATEX_EMAIL_SMTP_PORT"],
			secure: parse(process.env["SHARELATEX_EMAIL_SMTP_SECURE"]),
			ignoreTLS: parse(process.env["SHARELATEX_EMAIL_SMTP_IGNORE_TLS"]),
			name: process.env["SHARELATEX_EMAIL_SMTP_NAME"],
			logger: process.env["SHARELATEX_EMAIL_SMTP_LOGGER"] === 'true'
		},

		textEncoding:  process.env["SHARELATEX_EMAIL_TEXT_ENCODING"],
		template: {
			customFooter: process.env["SHARELATEX_CUSTOM_EMAIL_FOOTER"]
		}
	};

	if (process.env["SHARELATEX_EMAIL_AWS_SES_REGION"] != null) {
		settings.email.parameters.region = process.env["SHARELATEX_EMAIL_AWS_SES_REGION"];
	}

	if ((process.env["SHARELATEX_EMAIL_SMTP_USER"] != null) || (process.env["SHARELATEX_EMAIL_SMTP_PASS"] != null)) {
		settings.email.parameters.auth = {
			user: process.env["SHARELATEX_EMAIL_SMTP_USER"],
			pass: process.env["SHARELATEX_EMAIL_SMTP_PASS"]
		};
	}

	if (process.env["SHARELATEX_EMAIL_SMTP_TLS_REJECT_UNAUTH"] != null) {
		settings.email.parameters.tls =
			{rejectUnauthorized: parse(process.env["SHARELATEX_EMAIL_SMTP_TLS_REJECT_UNAUTH"])};
	}
}


// i18n
if (process.env["SHARELATEX_LANG_DOMAIN_MAPPING"] != null) {

	settings.i18n.subdomainLang = parse(process.env["SHARELATEX_LANG_DOMAIN_MAPPING"]);
}

// Password Settings
// -----------
// These restrict the passwords users can use when registering
// opts are from http://antelle.github.io/passfield
if (process.env["SHARELATEX_PASSWORD_VALIDATION_PATTERN"] || process.env["SHARELATEX_PASSWORD_VALIDATION_MIN_LENGTH"] || process.env["SHARELATEX_PASSWORD_VALIDATION_MAX_LENGTH"]) {

	settings.passwordStrengthOptions = {
		pattern: process.env["SHARELATEX_PASSWORD_VALIDATION_PATTERN"] || "aA$3",
		length: {min:process.env["SHARELATEX_PASSWORD_VALIDATION_MIN_LENGTH"] || 8, max: process.env["SHARELATEX_PASSWORD_VALIDATION_MAX_LENGTH"] || 150}
	};
}




//######################
// ShareLaTeX Server Pro
//######################

if (parse(process.env["SHARELATEX_IS_SERVER_PRO"]) === true) {
	settings.bypassPercentageRollouts = true;
	settings.apis.references =
		 {url: "http://localhost:3040"};
}


// LDAP - SERVER PRO ONLY
// ----------

if (process.env["SHARELATEX_LDAP_HOST"]) {
	console.error(`\
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
#
#  WARNING: The LDAP configuration format has changed in version 0.5.1
#  See https://github.com/sharelatex/sharelatex/wiki/Server-Pro:-LDAP-Config
#
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #\
`
	);
}

if (process.env["SHARELATEX_LDAP_URL"]) {
	let _ldap_connect_timeout, _ldap_group_search_attribs, _ldap_search_attribs, _ldap_timeout;
	settings.externalAuth = true;
	settings.ldap = {
		emailAtt: process.env["SHARELATEX_LDAP_EMAIL_ATT"],
		nameAtt: process.env["SHARELATEX_LDAP_NAME_ATT"],
		lastNameAtt: process.env["SHARELATEX_LDAP_LAST_NAME_ATT"],
		updateUserDetailsOnLogin: process.env["SHARELATEX_LDAP_UPDATE_USER_DETAILS_ON_LOGIN"] === 'true',
		placeholder: process.env["SHARELATEX_LDAP_PLACEHOLDER"],
		server: {
			url: process.env["SHARELATEX_LDAP_URL"],
			bindDn: process.env["SHARELATEX_LDAP_BIND_DN"],
			bindCredentials: process.env["SHARELATEX_LDAP_BIND_CREDENTIALS"],
			bindProperty: process.env["SHARELATEX_LDAP_BIND_PROPERTY"],
			searchBase: process.env["SHARELATEX_LDAP_SEARCH_BASE"],
			searchScope: process.env["SHARELATEX_LDAP_SEARCH_SCOPE"],
			searchFilter: process.env["SHARELATEX_LDAP_SEARCH_FILTER"],
			searchAttributes: (
				(_ldap_search_attribs = process.env["SHARELATEX_LDAP_SEARCH_ATTRIBUTES"]) ?
					(() => { try {
						return JSON.parse(_ldap_search_attribs);
					} catch (error3) {
						e = error3;
						return console.error("could not parse SHARELATEX_LDAP_SEARCH_ATTRIBUTES");
					} })()
				:
					undefined
			),
			groupDnProperty: process.env["SHARELATEX_LDAP_GROUP_DN_PROPERTY"],
			groupSearchBase: process.env["SHARELATEX_LDAP_GROUP_SEARCH_BASE"],
			groupSearchScope: process.env["SHARELATEX_LDAP_GROUP_SEARCH_SCOPE"],
			groupSearchFilter: process.env["SHARELATEX_LDAP_GROUP_SEARCH_FILTER"],
			groupSearchAttributes: (
				(_ldap_group_search_attribs = process.env["SHARELATEX_LDAP_GROUP_SEARCH_ATTRIBUTES"]) ?
					(() => { try {
						return JSON.parse(_ldap_group_search_attribs);
					} catch (error4) {
						e = error4;
						return console.error("could not parse SHARELATEX_LDAP_GROUP_SEARCH_ATTRIBUTES");
					} })()
				:
					undefined
			),
			cache: process.env["SHARELATEX_LDAP_CACHE"] === 'true',
			timeout: (
				(_ldap_timeout = process.env["SHARELATEX_LDAP_TIMEOUT"]) ?
					(() => { try {
						return parseIntOrFail(_ldap_timeout);
					} catch (error5) {
						e = error5;
						return console.error("Cannot parse SHARELATEX_LDAP_TIMEOUT");
					} })()
				:
					undefined
			),
			connectTimeout: (
				(_ldap_connect_timeout = process.env["SHARELATEX_LDAP_CONNECT_TIMEOUT"]) ?
					(() => { try {
						return parseIntOrFail(_ldap_connect_timeout);
					} catch (error6) {
						e = error6;
						return console.error("Cannot parse SHARELATEX_LDAP_CONNECT_TIMEOUT");
					} })()
				:
					undefined
			)
		}
	};

	if (process.env["SHARELATEX_LDAP_TLS_OPTS_CA_PATH"]) {
		let ca, ca_paths;
		try {
			ca = JSON.parse(process.env["SHARELATEX_LDAP_TLS_OPTS_CA_PATH"]);
		} catch (error7) {
			e = error7;
			console.error("could not parse SHARELATEX_LDAP_TLS_OPTS_CA_PATH, invalid JSON");
		}

		if (typeof(ca)  === 'string') {
			ca_paths = [ca];
		} else if ((typeof(ca) === 'object') && ((ca != null ? ca.length : undefined) != null)) {
			ca_paths = ca;
		} else {
			console.error("problem parsing SHARELATEX_LDAP_TLS_OPTS_CA_PATH");
		}

		settings.ldap.server.tlsOptions = {
			rejectUnauthorized: process.env["SHARELATEX_LDAP_TLS_OPTS_REJECT_UNAUTH"] === "true",
			ca:ca_paths  // e.g.'/etc/ldap/ca_certs.pem'
		};
	}
}





if (process.env["SHARELATEX_SAML_ENTRYPOINT"]) {
	// NOTE: see https://github.com/node-saml/passport-saml/blob/master/README.md for docs of `server` options
	let _saml_additionalAuthorizeParams, _saml_additionalLogoutParams, _saml_additionalParams, _saml_expiration, _saml_skew;
	settings.externalAuth = true;
	settings.saml = {
		updateUserDetailsOnLogin: process.env["SHARELATEX_SAML_UPDATE_USER_DETAILS_ON_LOGIN"] === 'true',
		identityServiceName: process.env["SHARELATEX_SAML_IDENTITY_SERVICE_NAME"],
		emailField: process.env["SHARELATEX_SAML_EMAIL_FIELD"] || process.env["SHARELATEX_SAML_EMAIL_FIELD_NAME"],
		firstNameField: process.env["SHARELATEX_SAML_FIRST_NAME_FIELD"],
		lastNameField:  process.env["SHARELATEX_SAML_LAST_NAME_FIELD"],
		server: {
			// strings
			entryPoint: process.env["SHARELATEX_SAML_ENTRYPOINT"],
			callbackUrl: process.env["SHARELATEX_SAML_CALLBACK_URL"],
			issuer: process.env["SHARELATEX_SAML_ISSUER"],
			decryptionPvk: process.env["SHARELATEX_SAML_DECRYPTION_PVK"],
			decryptionCert: process.env["SHARELATEX_SAML_DECRYPTION_CERT"],
			signatureAlgorithm: process.env["SHARELATEX_SAML_SIGNATURE_ALGORITHM"],
			identifierFormat: process.env["SHARELATEX_SAML_IDENTIFIER_FORMAT"],
			attributeConsumingServiceIndex: process.env["SHARELATEX_SAML_ATTRIBUTE_CONSUMING_SERVICE_INDEX"],
			authnContext: process.env["SHARELATEX_SAML_AUTHN_CONTEXT"],
			authnRequestBinding: process.env["SHARELATEX_SAML_AUTHN_REQUEST_BINDING"],
			validateInResponseTo: process.env["SHARELATEX_SAML_VALIDATE_IN_RESPONSE_TO"],
			cacheProvider: process.env["SHARELATEX_SAML_CACHE_PROVIDER"],
			logoutUrl: process.env["SHARELATEX_SAML_LOGOUT_URL"],
			logoutCallbackUrl: process.env["SHARELATEX_SAML_LOGOUT_CALLBACK_URL"],
			disableRequestedAuthnContext: process.env["SHARELATEX_SAML_DISABLE_REQUESTED_AUTHN_CONTEXT"] === 'true',
			forceAuthn: process.env["SHARELATEX_SAML_FORCE_AUTHN"] === 'true',
			skipRequestCompression: process.env["SHARELATEX_SAML_SKIP_REQUEST_COMPRESSION"] === 'true',
			acceptedClockSkewMs: (
				(_saml_skew = process.env["SHARELATEX_SAML_ACCEPTED_CLOCK_SKEW_MS"]) ?
					(() => { try {
						return parseIntOrFail(_saml_skew);
					} catch (error8) {
						e = error8;
						return console.error("Cannot parse SHARELATEX_SAML_ACCEPTED_CLOCK_SKEW_MS");
					} })()
				:
					undefined
			),
			requestIdExpirationPeriodMs: (
				(_saml_expiration = process.env["SHARELATEX_SAML_REQUEST_ID_EXPIRATION_PERIOD_MS"]) ?
					(() => { try {
						return parseIntOrFail(_saml_expiration);
					} catch (error9) {
						e = error9;
						return console.error("Cannot parse SHARELATEX_SAML_REQUEST_ID_EXPIRATION_PERIOD_MS");
					} })()
				:
					undefined
			),
			additionalParams: (
				(_saml_additionalParams = process.env["SHARELATEX_SAML_ADDITIONAL_PARAMS"]) ?
					(() => { try {
						return JSON.parse(_saml_additionalParams);
					} catch (error10) {
						e = error10;
						return console.error("Cannot parse SHARELATEX_SAML_ADDITIONAL_PARAMS");
					} })()
				:
					undefined
			),
			additionalAuthorizeParams: (
				(_saml_additionalAuthorizeParams = process.env["SHARELATEX_SAML_ADDITIONAL_AUTHORIZE_PARAMS"]) ?
					(() => { try {
						return JSON.parse(_saml_additionalAuthorizeParams );
					} catch (error11) {
						e = error11;
						return console.error("Cannot parse SHARELATEX_SAML_ADDITIONAL_AUTHORIZE_PARAMS");
					} })()
				:
					undefined
			),
			additionalLogoutParams: (
				(_saml_additionalLogoutParams = process.env["SHARELATEX_SAML_ADDITIONAL_LOGOUT_PARAMS"]) ?
					(() => { try {
						return JSON.parse(_saml_additionalLogoutParams );
					} catch (error12) {
						e = error12;
						return console.error("Cannot parse SHARELATEX_SAML_ADDITIONAL_LOGOUT_PARAMS");
					} })()
				:
					undefined
			)
		}
	};

	// SHARELATEX_SAML_CERT cannot be empty
	// https://github.com/node-saml/passport-saml/commit/f6b1c885c0717f1083c664345556b535f217c102
	if (process.env["SHARELATEX_SAML_CERT"]) {
		settings.saml.server.cert = process.env["SHARELATEX_SAML_CERT"];
		settings.saml.server.privateCert = process.env["SHARELATEX_SAML_PRIVATE_CERT"];
	}
}

// Compiler
// --------
if (process.env["SANDBOXED_COMPILES"] === "true") {
	settings.clsi = {
		dockerRunner: true,
		docker: {
			image: process.env["TEX_LIVE_DOCKER_IMAGE"],
			env: {
				HOME: "/tmp",
				PATH: process.env["COMPILER_PATH"] || "/usr/local/texlive/2015/bin/x86_64-linux:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
			},
			user: "www-data"
		}
	};

	if ((settings.path == null)) {
		settings.path = {};
	}
	settings.path.synctexBaseDir = () => "/compile";
	if (process.env['SANDBOXED_COMPILES_SIBLING_CONTAINERS']  === 'true') {
		console.log("Using sibling containers for sandboxed compiles");
		if (process.env['SANDBOXED_COMPILES_HOST_DIR']) {
			settings.path.sandboxedCompilesHostDir = process.env['SANDBOXED_COMPILES_HOST_DIR'];
		} else {
			console.error('Sibling containers, but SANDBOXED_COMPILES_HOST_DIR not set');
		}
	}
}


// Templates
// ---------
if (process.env["SHARELATEX_TEMPLATES_USER_ID"]) {
	settings.templates = {
		mountPointUrl: "/templates",
		user_id: process.env["SHARELATEX_TEMPLATES_USER_ID"]
	};

	settings.templateLinks = parse(process.env["SHARELATEX_NEW_PROJECT_TEMPLATE_LINKS"]);
}


// /Learn
// -------
if (process.env["SHARELATEX_PROXY_LEARN"] != null) {
	settings.proxyLearn = parse(process.env["SHARELATEX_PROXY_LEARN"]);
}


// /References
// -----------
if (process.env["SHARELATEX_ELASTICSEARCH_URL"] != null) {
	settings.references.elasticsearch =
			{host: process.env["SHARELATEX_ELASTICSEARCH_URL"]};
}

// TeX Live Images
// -----------
if (process.env["ALL_TEX_LIVE_DOCKER_IMAGES"] != null) {
	allTexLiveDockerImages = process.env["ALL_TEX_LIVE_DOCKER_IMAGES"].split(',');
}
if (process.env["ALL_TEX_LIVE_DOCKER_IMAGE_NAMES"] != null) {
	allTexLiveDockerImageNames = process.env["ALL_TEX_LIVE_DOCKER_IMAGE_NAMES"].split(',');
}
if (allTexLiveDockerImages != null) {
	settings.allowedImageNames = [];
	for (let index = 0; index < allTexLiveDockerImages.length; index++) {
		const fullImageName = allTexLiveDockerImages[index];
		const imageName = Path.basename(fullImageName);
		const imageDesc = (allTexLiveDockerImageNames != null) ? allTexLiveDockerImageNames[index] : imageName;
		settings.allowedImageNames.push({ imageName, imageDesc });
	}
}

// With lots of incoming and outgoing HTTP connections to different services,
// sometimes long running, it is a good idea to increase the default number
// of sockets that Node will hold open.
const http = require('http');
http.globalAgent.maxSockets = 300;
const https = require('https');
https.globalAgent.maxSockets = 300;

module.exports = settings;