'use strict';

var assert = require('assert');
var config = require('../lib/config');
var helper = require('../helper');
var redis = config.redis;
var uuid = require('uuid');

describe("The 'dbsize' method", function () {

    helper.allTests(function (parser, ip, args) {

        describe('using ' + parser + ' and ' + ip, function () {
            var key, value;

            beforeEach(function () {
                key = uuid.v4();
                value = uuid.v4();
            });

            describe('when not connected', function () {
                var client;

                beforeEach(function (done) {
                    client = redis.createClient.apply(null, args);
                    client.once('ready', function () {
                        client.quit();
                    });
                    client.on('end', done);
                });

                it('reports an error', function (done) {
                    client.dbsize([], function (err, res) {
                        assert(err.message.match(/The connection is already closed/));
                        done();
                    });
                });
            });

            describe('when connected', function () {
                var client;

                beforeEach(function (done) {
                    client = redis.createClient.apply(null, args);
                    client.once('ready', function () {
                        client.flushdb(function (err, res) {
                            helper.isString('OK')(err, res);
                            done();
                        });
                    });
                });

                afterEach(function () {
                    client.end(true);
                });

                it('returns a zero db size', function (done) {
                    client.DBSIZE([], function (err, res) {
                        helper.isNotError()(err, res);
                        helper.isType.number()(err, res);
                        assert.strictEqual(res, 0, 'Initial db size should be 0');
                        done();
                    });
                });

                describe('when more data is added to Redis', function () {
                    var oldSize;

                    beforeEach(function (done) {
                        client.dbsize(function (err, res) {
                            helper.isType.number()(err, res);
                            assert.strictEqual(res, 0, 'Initial db size should be 0');

                            oldSize = res;

                            client.set(key, value, function (err, res) {
                                helper.isNotError()(err, res);
                                done();
                            });
                        });
                    });

                    it('returns a larger db size', function (done) {
                        client.dbsize([], function (err, res) {
                            helper.isNotError()(err, res);
                            helper.isType.positiveNumber()(err, res);
                            assert.strictEqual(true, (oldSize < res), 'Adding data should increase db size.');
                            done();
                        });
                    });
                });
            });
        });
    });
});