const chai = require("chai");
const expect = chai.expect;

var t = require('../../src/util/strftime.js');

describe('util/strftime', function() {
    var now;
    before(function() {
        mockUTC();
        now = new Date('2016-01-04T13:15:23');
        then = new Date('2016-03-06T03:05:03');
    });
    after(function() {
        restoreUTC();
    });

    it('should format UTC datetime', function() {
        expect(t(now, '%Y-%m-%dT%H:%M:%S')).to.equal('2016-01-04T13:15:23');
    });
    it('should format %A as Monday', function() {
        expect(t(now, '%A')).to.equal('Monday');
    });
    it('should format %B as month name', function() {
        expect(t(now, '%B')).to.equal('January');
    });
    it('should format %C as century', function() {
        expect(t(now, '%C')).to.equal('20');
    });
    it('should format %c as local string', function() {
        expect(t(now, '%c')).to.equal(now.toLocaleString());
    });
    it('should format %e as space padded date', function() {
        expect(t(now, '%e')).to.equal(' 4');
    });
    it('should format %I as 0 padded hour12', function() {
        expect(t(now, '%I')).to.equal('01');
    });
    it('should format %j as day of year', function() {
        expect(t(then, '%j')).to.equal('066');
    });
    it('should format %k as space padded hour', function() {
        expect(t(then, '%k')).to.equal(' 3');
    });
    it('should format %l as space padded hour12', function() {
        expect(t(now, '%l')).to.equal(' 1');
    });
    it('should format %L as 0 padded millisecond', function() {
        expect(t(then, '%L')).to.equal('000');
    });
    it('should format %p as upper cased am/pm', function() {
        expect(t(now, '%p')).to.equal('PM');
        expect(t(then, '%p')).to.equal('AM');
    });
    it('should format %P as lower cased am/pm', function() {
        expect(t(now, '%P')).to.equal('pm');
        expect(t(then, '%P')).to.equal('am');
    });
    it('should format %q as date suffix', function(){
        var st = new Date('2016-03-01T03:05:03');
        var nd = new Date('2016-03-02T03:05:03');
        var rd = new Date('2016-03-03T03:05:03');
        expect(t(st, '%q')).to.equal('st');
        expect(t(nd, '%q')).to.equal('nd');
        expect(t(rd, '%q')).to.equal('rd');
        expect(t(now, '%q')).to.equal('th');
    });
    it('should format %s as UNIX seconds', function(){
        expect(t(now, '%s')).to.be.match(/\d+/);
    });
    it('should format %u as day of week(1-7)', function(){
        expect(t(now, '%u')).to.be.equal('1');
        expect(t(then, '%u')).to.be.equal('7');
    });
    it('should format %U as week of year, starts with 0', function() {
        expect(t(now, '%U')).to.equal('01');
    });
    it('should format %w as day of month(0-7)', function(){
        expect(t(now, '%w')).to.be.equal('1');
        expect(t(then, '%w')).to.be.equal('0');
    });
    it('should format %W as week of year, starts with 1', function(){
        expect(t(now, '%W')).to.be.equal('01');
    });
    it('should format %x as local date string', function() {
        expect(t(now, '%x')).to.equal(now.toLocaleDateString());
    });
    it('should format %X as local time string', function() {
        expect(t(now, '%X')).to.equal(now.toLocaleTimeString());
    });
    it('should format %y as 2-digit year', function() {
        expect(t(now, '%y')).to.equal('16');
    });
    it('should format %z as time zone', function() {
        expect(t(now, '%z')).to.equal('+0800');
    });
    it('should escape %% as %', function() {
        expect(t(now, '%%')).to.equal('%');
    });
});


function mockUTC() {
    var p = Date.prototype;

    p._getHours = p.getHours;
    p.getHours = p.getUTCHours;

    p._getDays = p.getDays;
    p.getDays = p.getUTCDays;

    p._getTimezoneOffset = p._getTimezoneOffset;
    p.getTimezoneOffset = () => -480;
}

function restoreUTC() {
    var p = Date.prototype;
    p.getHours = p._getHours;
    p.getDays = p._getDays;
    p.getTimezoneOffset = p._getTimezoneOffset;
}