// Rules parsing
function getAntecedent(rule) {
    withoutIf = rule.split('if');
    return withoutIf[1].trim().split('then')[0].trim();
}

function getAntecedentComponents(antecedent) {
    return antecedent.split('and').map((i) => i.trim());
}

function getVariable(antecedent) {
    return antecedent.split('is')[0].trim();
}

function getVariableValue(antecedent) {
    return antecedent.split('is')[1].trim();
}

// Rules creation

/* exported MessageTypesEnum */
var MessageTypesEnum = {
    INFO: "info",
    SUCCESS: "success",
    WARNING: "warning",
    DANGER: "danger"
};
Object.freeze(MessageTypesEnum);

function isEmpty(value) {
    if (typeof  value === "function") {
        return false;
    }
    return (value == null || value.length === 0);
}

/* exported showFeedbackMessage */
function showFeedbackMessage(message, type) {
    alert(type + ' ' + message);
}
/* exported errorHandler */
function errorHandler(response, callBack, errorCallBack) {
    if (!isEmpty(response.error)) {
        // TODO: add l10n
        // showFeedbackMessage(response.error.code + ": " + response.error.message, MessageTypesEnum.DANGER);
        if (!isEmpty(errorCallBack)) {
            errorCallBack(response.data);
        }
        throw response.error.code + ": " + response.error.message +
        " / Details: " + response.error.data;
    }
    if (!isEmpty(callBack)) {
        callBack(response);
    }
}

/* exported getFromRest */
function getFromRest(url, callBack) {
    $.ajax({
        url: url,
        cache: false,
        success: function (response) {
            errorHandler(response, callBack);
        }
    });
}

/* exported createRule */
 function createRule() {
    var ruleString = "if ";
    var inp = $('.selectpicker.inputVar').children(':selected').map(function() {return $(this).text();}).get();
    var inpVal = $('.selectpicker.inputVal').children(':selected').map(function() {return $(this).text();}).get();
    for (var i = 0; i < inp.length; i++) {
        if (i > 0) {
            ruleString += ' and ';
        }
        ruleString += inp[i] + " is " + inpVal[i];
    }
    $('#ruleContent').val(ruleString);
}

/* exported fillSelect */
function fillSelect(selectElement, values) {
    $(selectElement).html("");
    $.each(values, function (key, value) {
        $(selectElement).append($("<option />").val(value.id).text(value.name));
    });
}

function fillFuzzyTerms(variablesElement, fuzzyTermsElement) {
    getFromRest("/rule/getFuzzyTerms/"+$(variablesElement).val(), function (fuzzyTerms) {
       var fuzzyTermsData = [];
       $.each(fuzzyTerms, function (key, value) {
           fuzzyTermsData.push({
               id: value.id,
               name: value.description
           });
       });
       fillSelect(fuzzyTermsElement, fuzzyTermsData);
       $(fuzzyTermsElement).selectpicker("refresh");
       $(fuzzyTermsElement).trigger("change");
   });
}

function fillVariables(projectId, variablesElement) {
    getFromRest("/rule/getVariables/"+projectId, function (variables) {
       var variablesData = [];
       $.each(variables, function (key, value) {
           variablesData.push({
               id: value.id,
               name: value.name
           });
       });
       fillSelect(variablesElement, variablesData);
       $(variablesElement).selectpicker("refresh");
       $(variablesElement).trigger("change");
   });
}

function variableValueChanged(variablesElement, fuzzyTermsElement) {
    fillFuzzyTerms(variablesElement, fuzzyTermsElement);
}

function fuzzyTermsValueChanged() {
    createRule();
}

function addVariableSelect(projectId) {
    var variablesElement = $("<select class='selectpicker inputVar m-2' data-live-search='true data-width='70%'></select>");
    fillVariables(projectId, variablesElement);
    return variablesElement;
}

function addFuzzyTermsSelect(variablesElement) {
    fuzzyTermsElement = $("<select class='selectpicker inputVal m-2' data-live-search='true data-width='70%'></select>");
    if ($(variablesElement).val()) {
        fillFuzzyTerms(variablesElement, fuzzyTermsElement);
    }
    return fuzzyTermsElement;
}

function addAntecedent(parentElement, projectId) {
    rowElement = $("<div class='row'></div>");
    if ($(parentElement).find('.row').length) {
        $(rowElement).append("<label class='col col-md-1 m-2'>И</label>");
    } else {
        $(rowElement).append("<label class='col col-md-1 m-2'> </label>");
    }
    var variablesElement = addVariableSelect(projectId);
    var fuzzyTermsElement = addFuzzyTermsSelect(variablesElement)
    $(variablesElement).on( "change", function() {variableValueChanged(variablesElement, fuzzyTermsElement)});
    $(fuzzyTermsElement).on( "change", function() {fuzzyTermsValueChanged()});
    $(rowElement).append(variablesElement);
    $(rowElement).append("<label class='col col-md-1  m-2'>есть</label>");
    $(rowElement).append(fuzzyTermsElement);
    $(parentElement).append(rowElement);
}