var Node = require("./node"),
    JsEvalNode = require("./js-eval-node"),
    Variable = require("./variable");

var Quoted = function (str, content, escaped, index, currentFileInfo) {
    this.escaped = escaped;
    this.value = content || '';
    this.quote = str.charAt(0);
    this.index = index;
    this.currentFileInfo = currentFileInfo;
};
Quoted.prototype = new JsEvalNode();
Quoted.prototype.type = "Quoted";
Quoted.prototype.genCSS = function (context, output) {
    if (!this.escaped) {
        output.add(this.quote, this.currentFileInfo, this.index);
    }
    output.add(this.value);
    if (!this.escaped) {
        output.add(this.quote);
    }
};
Quoted.prototype.containsVariables = function() {
    return this.value.match(/(`([^`]+)`)|@\{([\w-]+)\}/);
};
Quoted.prototype.eval = function (context) {
    var that = this, value = this.value;
    var javascriptReplacement = function (_, exp) {
        return String(that.evaluateJavaScript(exp, context));
    };
    var interpolationReplacement = function (_, name) {
        var v = new Variable('@' + name, that.index, that.currentFileInfo).eval(context, true);
        return (v instanceof Quoted) ? v.value : v.toCSS();
    };
    function iterativeReplace(value, regexp, replacementFnc) {
        var evaluatedValue = value;
        do {
          value = evaluatedValue;
          evaluatedValue = value.replace(regexp, replacementFnc);
        } while  (value!==evaluatedValue);
        return evaluatedValue;
    }
    value = iterativeReplace(value, /`([^`]+)`/g, javascriptReplacement);
    value = iterativeReplace(value, /@\{([\w-]+)\}/g, interpolationReplacement);
    return new Quoted(this.quote + value + this.quote, value, this.escaped, this.index, this.currentFileInfo);
};
Quoted.prototype.compare = function (other) {
    // when comparing quoted strings allow the quote to differ
    if (other.type === "Quoted" && !this.escaped && !other.escaped) {
        return Node.numericCompare(this.value, other.value);
    } else {
        return other.toCSS && this.toCSS() === other.toCSS() ? 0 : undefined;
    }
};
module.exports = Quoted;
