// ==UserScript==
// @name          Amazon a Dolar Tarjeta
// @namespace     sharkiller-amazon-dolar-tarjeta
// @description   Mostrar precios en dolar tarjeta
// @version       1.0
// @include       http://www.amazon.com/*
// @include       https://www.amazon.com/*
// @include       http://amazon.com/*
// @include       https://amazon.com/*
// @include       http://www.amazon.co.uk/*
// @include       https://www.amazon.co.uk/*
// @include       http://amazon.co.uk/*
// @include       https://amazon.co.uk/*
// @include       http://www.amazon.ca/*
// @include       https://www.amazon.ca/*
// @include       http://amazon.ca/*
// @include       https://amazon.ca/*
// @require       http://code.jquery.com/jquery-latest.js
// @grant         GM_getValue
// @grant         GM_setValue
// @grant         GM_xmlhttpRequest
// @grant         GM_addStyle
// @downloadURL none
// ==/UserScript==

(function() {
if( typeof jQuery === 'undefined' ){
    return false;
}
GM_addStyle(`
.price-ars {
  color: green;
  display: inline-block;
  margin: 0 8px;
  background: linear-gradient(to bottom,lightblue,white,lightblue);
  border-radius: 8px;
  padding: 0 6px;
}
#sc-buy-box .price-ars {
  font-size: 12px;
  display: block;
  padding: 0;
  margin: 0;
  background: none;
}
div#sc-buy-box {
  margin-bottom: -14px;
}
`);

String.prototype.endsWith = function (pattern) {
	var d = this.length - pattern.length;
	return d >= 0 && this.lastIndexOf(pattern) === d;
};

var amazonCurrencies = ["USD", "GBP", "CAD"];
var currencyFrom;

function regularPriceParser(price, currency) {
	return parseFloat(price.replace(/,/g, ""));
}

var currencies = {
	"USD" : {
		symbol: "$",
		priceRegex: /\$\s*([\d,.]+\d)/
	},

	"GBP" : {
		symbol: "£",
		priceRegex: /£\s*([\d,.]+\d)/
	},

	"CAD" : {
		symbol: "CDN$",
		priceRegex: /CDN\$\s*([\d,.]+\d)/
	}
};

if (document.domain.endsWith("com")) {
	currencyFrom = "USD";
// amazon.co.uk
} else if (document.domain.endsWith("co.uk")) {
	currencyFrom = "GBP";
// amazon.ca
} else if (document.domain.endsWith("ca")) {
	currencyFrom = "CAD";
} else {
	return;
}

var LAST_RUN = "last_run_";
var CURRENCY_RATE = "currency_rate_";

var decimalPlaces = 2;
var prefixCurrencySymbol = true;
var taxPorcentage = 35;

var rounding = Math.pow(10, decimalPlaces);

var rate = GM_getValue(CURRENCY_RATE + currencyFrom);
var lastRun = GM_getValue(LAST_RUN + currencyFrom, "01/01/0001");
var currencyTo = 'ARS';
var todayDate = new Date();
var todayString = todayDate.getDate() + "/" + todayDate.getMonth() + "/" + todayDate.getFullYear();
var currencyToSymbol = 'ARS $';

function fetchCurrencyData(coin, callback) {
	GM_xmlhttpRequest({
		method: "GET",
		url: "http://download.finance.yahoo.com/d/quotes.csv?s=" + coin + currencyTo + "=X&f=l1&e=.csv",
		onload: function(responseDetails) {
			var rate = responseDetails.responseText.replace(/[\r\n]/g, "");
			GM_setValue(CURRENCY_RATE + coin, rate);
			GM_setValue(LAST_RUN + coin, todayString);
			callback();
		},
		onerror: function(responseDetails) {
			alert("Error fetching currency data for " + coin);
		}
	});
}

function appendConversion(price, matched) {
	var originalPrice = regularPriceParser(matched, currencyFrom);

	if (isNaN(originalPrice)) {
		return price;
	}

	var converted = formatCurrency(originalPrice * (rate * (taxPorcentage / 100 + 1)), rounding,
		currencyToSymbol, prefixCurrencySymbol);

	return price + "<div class='price-ars'>" + converted + "</div>";
}

function formatCurrency(num, rounding, symbol, prefix) {
	sign = (num == (num = Math.abs(num)));
	num = Math.floor(num * rounding + 0.50000000001);
	cents = num % rounding;

	num = Math.floor(num / rounding).toString();

	if (cents < 10) {
		cents = "0" + cents;
	}

	for (var i = 0; i < Math.floor((num.length - (1 + i)) / 3); i++) {
		num = num.substring(0, num.length - (4 * i + 3)) + ',' +
		                       num.substring(num.length-(4*i+3));
	}

	if (prefix) {
		return (symbol + ((sign)?'':'-') + num + '.' + cents);
	} else {
		return (((sign)?'':'-') + num + '.' + cents + symbol);
	}
}
    
function convertCurrency(carrito) {
    if(carrito && jQuery('.a-size-base.a-text-bold:contains(Order summary)').length == 0){
        return false;
    }else{
        if(jQuery('#sc-buy-box.price-ars-cart').length == 0){
            jQuery('#sc-buy-box').addClass('price-ars-cart');
        }else{
            return false;
        }
    }
    console.log('Cambiando precios', carrito);
    
	var currency = currencies[currencyFrom];

    jQuery('.a-column.a-span3.a-text-right.a-span-last.sc-value').removeClass('a-span3').addClass('a-span4');
    jQuery('.a-column.a-span9.sc-text').removeClass('a-span9').addClass('a-span8');
    jQuery('a.a-popover-trigger.a-declarative:contains(Estimated)').html('Shipping & handling <i class="a-icon a-icon-popover"></i>');

    jQuery('span:not(:has(*))').each(function(){
        var text = jQuery(this).text();
        if( jQuery(this).children().length == 0 && text.indexOf(currency.symbol) != -1 && text.indexOf('ARS') == -1)
            jQuery(this).html( text.replace(currency.priceRegex, appendConversion) );
    });
}

jQuery( document ).ready(function(){
    if (rate === undefined || todayString !== lastRun) {
        fetchCurrencyData(currencyFrom, function() {
            rate = GM_getValue(CURRENCY_RATE + currencyFrom);
            convertCurrency();
        });
    } else {
        console.log('asdasd');
        convertCurrency();
    }

    jQuery('.a-fixed-right-grid-col.a-col-right').bind("DOMSubtreeModified",function(e){
        convertCurrency(true);
    });

    /*jQuery('#sc-buy-box').after('<button id="precioCarrito" type="button" class="a-button a-button-span12 a-button-primary" style="margin: 10px 0;"><span class="a-button-inner" style="padding: 7px 0;">Actualizar precios del carrito</span></button>');
    jQuery('#precioCarrito').click(function(){
        convertCurrency(true);
    });*/
});
})();