'use strict';

var path = require('path');
var fs = require('fs');
var async = require('async');
var semver = require('semver');
var winston = require('winston');
require('colors');

var pkg = require('../../package.json');

module.exports = function (Meta) {
	Meta.dependencies = {};

	Meta.dependencies.check = function (callback) {
		var modules = Object.keys(pkg.dependencies);
		var depsOutdated = false;
		var depsMissing = false;

		winston.verbose('Checking dependencies for outdated modules');

		async.each(modules, function (module, next) {
			fs.readFile(path.join(__dirname, '../../node_modules/', module, 'package.json'), {
				encoding: 'utf-8',
			}, function (err, pkgData) {
				if (err) {
					// If a bundled plugin/theme is not present, skip the dep check (#3384)
					if (err.code === 'ENOENT' && (module === 'nodebb-rewards-essentials' || module.startsWith('nodebb-plugin') || module.startsWith('nodebb-theme'))) {
						winston.warn('[meta/dependencies] Bundled plugin ' + module + ' not found, skipping dependency check.');
						return next();
					}
					return next(err);
				}

				try {
					pkgData = JSON.parse(pkgData);
				} catch (e) {
					process.stdout.write('[' + 'missing'.red + '] ' + module.bold + ' is a required dependency but could not be found\n');
					depsMissing = true;
					return next();
				}

				var ok = !semver.validRange(pkg.dependencies[module]) || semver.satisfies(pkgData.version, pkg.dependencies[module]);

				if (ok || (pkgData._resolved && pkgData._resolved.indexOf('//github.com') !== -1)) {
					next();
				} else {
					process.stdout.write('[' + 'outdated'.yellow + '] ' + module.bold + ' installed v' + pkgData.version + ', package.json requires ' + pkg.dependencies[module] + '\n');
					depsOutdated = true;
					next();
				}
			});
		}, function (err) {
			if (err) {
				return callback(err);
			}

			if (depsMissing) {
				callback(new Error('dependencies-missing'));
			} else if (depsOutdated) {
				callback(global.env !== 'development' ? new Error('dependencies-out-of-date') : null);
			} else {
				callback(null);
			}
		});
	};
};