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var expat = require('node-expat');
var fs = require('fs');

// This object will hold the final result.
var obj = currentObject = {};
var ancestors = [];

var options = {}; //configuration options
function startElement(name, attrs) {
    if (! (name in currentObject)) {
        currentObject[name] = attrs;
    } else if (!Array.isArray(currentObject[name])) {
        // Put the existing object in an array.
        var newArray = [currentObject[name]];
        // Add the new object to the array.
        newArray.push(attrs);
        // Point to the new array.
        currentObject[name] = newArray;
    } else {
        // An array already exists, push the attributes on to it.
        currentObject[name].push(attrs);
    }

    // Store the current (old) parent.
    ancestors.push(currentObject);

    // We are now working with this object, so it becomes the current parent.
    if (Array.isArray(currentObject[name])) {
        // If it is an array, get the last element of the array.
        currentObject = currentObject[name][currentObject[name].length - 1];
    } else {
        // Otherwise, use the object itself.
        currentObject = currentObject[name];
    }
}

function text(data) {
    data = data.trim();
    if (!data.length) {
        return;
    }
    currentObject['$t'] = (currentObject['$t'] || '') + data;
}

function endElement(name) {
    // This should check to make sure that the name we're ending
    // matches the name we started on.
    var ancestor = ancestors.pop();
    if (!options.reversible) {
        if ((Object.keys(currentObject).length == 1) &&
            ('$t' in currentObject)) {

            if (Array.isArray(ancestor[name])) {
                ancestor[name].push(ancestor[name].pop()['$t']);
            } else {
                ancestor[name] = currentObject['$t'];
            }
        }
    }

    currentObject = ancestor;
}

/**
 * Parses xml to json using node-expat.
 * @param {String|Buffer} xml The xml to be parsed to json.
 * @param {Object} _options An object with options provided by the user.
 * The available options are:
 *  - object: If true, the parser returns a Javascript object instead of
 *            a JSON string.
 *  - reversible: If true, the parser generates a reversible JSON, mainly
 *                characterized by the presence of the property $t.
 *  - sanitize_values: If true, the parser escapes any element value in the xml
 *                     that matches one of the following characters:
 * character | escaped
 *      <       &lt;
 *      >       &gt;
 *      (       &#40;
 *      )       &#41;
 *      #       &#35;
 *      &       &amp;
 *      "       &quot;
 *      '       &apos;.
 * @return {String|Object} A String or an Object with the JSON representation
 * of the XML.
 **/
module.exports = function(xml, _options) {
    var parser = new expat.Parser('UTF-8');

    parser.on('startElement', startElement);
    parser.on('text', text);
    parser.on('endElement', endElement);

    obj = currentObject = {};
    ancestors = [];

    options = {
        object: false,
        reversible: false,
        sanitize_values: false
    };

    for (var opt in _options) {
        options[opt] = _options[opt];
    }

    if (!parser.parse(xml)) {
        //console.log('-->' + xml + '<--');
        throw new Error('There are errors in your xml file: ' +
        parser.getError());
    }

    if (options.object) {
        return obj;
    }

    return JSON.stringify(obj);
};