/**
 * fullscreenForm.js v1.0.0
 * http://www.codrops.com
 *
 * Licensed under the MIT license.
 * http://www.opensource.org/licenses/mit-license.php
 *
 * Copyright 2014, Codrops
 * http://www.codrops.com
 */
;
(function(window) {

    'use strict';

    var support = { animations: Modernizr.cssanimations },
        animEndEventNames = { 'WebkitAnimation': 'webkitAnimationEnd', 'OAnimation': 'oAnimationEnd', 'msAnimation': 'MSAnimationEnd', 'animation': 'animationend' },
        // animation end event name
        animEndEventName = animEndEventNames[Modernizr.prefixed('animation')];

    /**
     * extend obj function
     */
    function extend(a, b) {
        for (var key in b) {
            if (b.hasOwnProperty(key)) {
                a[key] = b[key];
            }
        }
        return a;
    }

    /**
     * createElement function
     * creates an element with tag = tag, className = opt.cName, innerHTML = opt.inner and appends it to opt.appendTo
     */
    function createElement(tag, opt) {
        var el = document.createElement(tag)
        if (opt) {
            if (opt.cName) {
                el.className = opt.cName;
            }
            if (opt.inner) {
                el.innerHTML = opt.inner;
            }
            if (opt.appendTo) {
                opt.appendTo.appendChild(el);
            }
        }
        return el;
    }

    // finds no of occurances of substring
    function occurrences(string, subString, allowOverlapping) {
        string += "";
        subString += "";
        if (subString.length <= 0) return (string.length + 1);

        var n = 0,
            pos = 0,
            step = allowOverlapping ? 1 : subString.length;

        while (true) {
            pos = string.indexOf(subString, pos);
            if (pos >= 0) {
                ++n;
                pos += step;
            } else break;
        }
        return n;
    }

    function isTransfer(text) {
        var wordlist = ['transfer', 'send', 'give']; // keep list's content lowercase
        var textList = text.split(' ');
        for (var i = 0; i < wordlist.length; i++) {
            if (textList.includes(wordlist[i])) {
                return true;
            }
        }
        return false;
    }


    function isIncorp(text) {
        var wordlist = ['incorporate', 'create', 'start', 'begin']; // keep list's content lowercase
        var textList = text.split(' ');
        for (var i = 0; i < wordlist.length; i++) {
            if (textList.includes(wordlist[i])) {
                return true;
            }
        }
        return false;
    }


    function extractAmount(text) {
        var count = 0;
        var returnval;
        var splitText = text.split(/\W+/);

        for (var i = 0; i < splitText.length; i++) {
            if (parseFloat(splitText[i])) {
                count += 1;
                returnval = parseFloat(splitText[i]);
            }
            if (count > 1) {
                return 0;
            }
        }
        return returnval;
    }

    function extractAddress(text) {
        var textList = text.split(' ')
        for (var i = 0; i < textList.length; i++) {
            if (textList[i] == '') {
                continue;
            }
            if (textList[i].endsWith('$') && textList[i].length != 1) {
                return textList[i];
            }
        }
        return 0;
    }


    function extractInitTokens(text) {
        var base_units = { 'thousand': 10 ** 3, 'million': 10 ** 6, 'billion': 10 ** 9, 'trillion': 10 ** 12 };
        var textList = text.split(' ');
        var counter = 0;
        var value;
        for (var i = 0; i < textList.length; i++) {
            if (!isNaN(textList[i])) {
                if (base_units.hasOwnProperty(textList[i + 1])) {
                    value = textList[i] * base_units[textList[i + 1]];
                    counter += 1;
                }
                else{
                    value = parseFloat(textList[i]);
                    counter = counter + 1;
                }
            } else {
                for (var j = 0; j < Object.keys(base_units).length; j++) {
                    var result = textList[i].split(Object.keys(base_units)[j]);
                    if (result.length == 2 && result[1] == '' && result[0] != '') {
                        if (!isNaN(result[0])) {
                            value = parseFloat(result[0]) * base_units[Object.keys(base_units)[j]];
                            counter = counter + 1;
                        }
                    }
                }
            }
        }

        if (counter == 1) {
            return value;
        } else {
            return 0;
        }
    }



    function parse_flodata(flodata) {
        debugger;
        if (flodata.slice(0, 5) == 'text') {
            flodata = flodata.split('text:')[1];
        }

        var nospacestring = flodata.replace(/ +/g, ' ');
        var cleanstring = nospacestring.toLowerCase();

        var parsed_data;

        var atList = [];
        var hashList = [];

        var cleanstringList = cleanstring.split(' ')

        for (var i = 0; i < cleanstringList.length; i++) {
            if (cleanstringList[i].endsWith('@') && cleanstringList[i].length != 1) {
                atList.push(cleanstringList[i]);
            }
            if (cleanstringList[i].endsWith('#') && cleanstringList[i].length != 1) {
                hashList.push(cleanstringList[i]);
            }
        }

        if (atList.length == 0 && hashList.length == 0 || atList.length > 1 || hashList.length > 1) {
            parsed_data = { 'type': 'noise', 'flodata': nospacestring };
        } else if (hashList.length == 1 && atList.length == 0) {
            // Passing the above check means token creation or transfer
            var incorporation = isIncorp(cleanstring);
            var transfer = isTransfer(cleanstring);

            //todo Rule 27 - if (neither token incorporation and token transfer) OR both token incorporation and token transfer, reject
            if ((!incorporation && !transfer) || (incorporation && transfer)) {
                parsed_data = { 'type': 'noise', 'flodata': nospacestring };
            } else if (incorporation && !transfer) {
                var initTokens = extractInitTokens(cleanstring);
                if (initTokens != 0) {
                    parsed_data = {
                        'type': 'tokenIncorporation',
                        'flodata': nospacestring,
                        'tokenIdentification': hashList[0].slice(0, hashList[0].length - 1),
                        'tokenAmount': initTokens
                    };
                } else {
                    parsed_data = { 'type': 'noise', 'flodata': nospacestring };
                }
            }
            // todo Rule 30 - if not token creation and is token transfer then then process it for token transfer rules
            // todo Rule 31 - Extract number of tokens to be sent and the address to which to be sent, both data is mandatory
            else if (!incorporation && transfer) {
                var amount = extractAmount(cleanstring, hashList[0].slice(0, hashList[0].length - 1));
                if (amount != 0) {
                    parsed_data = {
                        'type': 'transfer',
                        'transferType': 'token',
                        'flodata': nospacestring,
                        'tokenIdentification': hashList[0].slice(0, hashList[0].length - 1),
                        'tokenAmount': amount
                    };
                } else {
                    parsed_data = { 'type': 'noise', 'flodata': nospacestring };
                }
            }

        } else {
            parsed_data = { 'type': 'noise', 'flodata': nospacestring };
        }

        return parsed_data;
    }


    /**
     * FForm function
     */
    function FForm(el, options) {
        this.el = el;
        this.options = extend({}, this.options);
        extend(this.options, options);
        this._init();
    }

    /**
     * FForm options
     */
    FForm.prototype.options = {
        // show progress bar
        ctrlProgress: true,
        // show navigation dots
        ctrlNavDots: true,
        // show [current field]/[total fields] status
        ctrlNavPosition: true,
        // reached the review and submit step
        onReview: function() { return false; }
    };

    /**
     * init function
     * initialize and cache some vars
     */
    FForm.prototype._init = function() {
        // the form element
        this.formEl = this.el.querySelector('form');

        // list of fields
        this.fieldsList = this.formEl.querySelector('ol.fs-fields');

        // current field position
        this.current = 0;

        // all fields
        this.fields = [].slice.call(this.fieldsList.children);

        // total fields
        this.fieldsCount = this.fields.length;

        // show first field
        classie.add(this.fields[this.current], 'fs-current');

        // create/add controls
        this._addControls();

        // create/add messages
        this._addErrorMsg();

        // init events
        this._initEvents();
    };

    /**
     * addControls function
     * create and insert the structure for the controls
     */
    FForm.prototype._addControls = function() {
        // main controls wrapper
        this.ctrls = createElement('div', { cName: 'fs-controls', appendTo: this.el });

        // continue button (jump to next field)
        this.ctrlContinue = createElement('button', { cName: 'fs-continue', inner: 'Continue', appendTo: this.ctrls });
        this._showCtrl(this.ctrlContinue);

        // navigation dots
        if (this.options.ctrlNavDots) {
            this.ctrlNav = createElement('nav', { cName: 'fs-nav-dots', appendTo: this.ctrls });
            var dots = '';
            for (var i = 0; i < this.fieldsCount; ++i) {
                dots += i === this.current ? '<button class="fs-dot-current"></button>' : '<button disabled></button>';
            }
            this.ctrlNav.innerHTML = dots;
            this._showCtrl(this.ctrlNav);
            this.ctrlNavDots = [].slice.call(this.ctrlNav.children);
        }

        // field number status
        if (this.options.ctrlNavPosition) {
            this.ctrlFldStatus = createElement('span', { cName: 'fs-numbers', appendTo: this.ctrls });

            // current field placeholder
            this.ctrlFldStatusCurr = createElement('span', { cName: 'fs-number-current', inner: Number(this.current + 1) });
            this.ctrlFldStatus.appendChild(this.ctrlFldStatusCurr);

            // total fields placeholder
            this.ctrlFldStatusTotal = createElement('span', { cName: 'fs-number-total', inner: this.fieldsCount });
            this.ctrlFldStatus.appendChild(this.ctrlFldStatusTotal);
            //this._showCtrl(this.ctrlFldStatus);
        }

        // progress bar
        if (this.options.ctrlProgress) {
            this.ctrlProgress = createElement('div', { cName: 'fs-progress', appendTo: this.ctrls });
            this._showCtrl(this.ctrlProgress);
        }
    }

    /**
     * addErrorMsg function
     * create and insert the structure for the error message
     */
    FForm.prototype._addErrorMsg = function() {
        // error message
        this.msgError = createElement('span', { cName: 'fs-message-error', appendTo: this.el });
    }

    /**
     * init events
     */
    FForm.prototype._initEvents = function() {
        var self = this;

        // show next field
        this.ctrlContinue.addEventListener('click', function() {
            var flodata = document.getElementById('q1');
            var result = parse_flodata(flodata.value);
            console.log(result);
            self._nextField(undefined, result);
        });

        // navigation dots
        if (this.options.ctrlNavDots) {
            this.ctrlNavDots.forEach(function(dot, pos) {
                dot.addEventListener('click', function() {
                    self._showField(pos);
                });
            });
        }

        // jump to next field without clicking the continue button (for fields/list items with the attribute "data-input-trigger")
        this.fields.forEach(function(fld) {
            if (fld.hasAttribute('data-input-trigger')) {
                var input = fld.querySelector('input[type="radio"]') || /*fld.querySelector( '.cs-select' ) ||*/ fld.querySelector('select'); // assuming only radio and select elements (TODO: exclude multiple selects)
                if (!input) return;

                switch (input.tagName.toLowerCase()) {
                    case 'select':
                        input.addEventListener('change', function() { self._nextField(); });
                        break;

                    case 'input':
                        [].slice.call(fld.querySelectorAll('input[type="radio"]')).forEach(function(inp) {
                            inp.addEventListener('change', function(ev) { self._nextField(); });
                        });
                        break;

                        /*
                        // for our custom select we would do something like:
                        case 'div' :
                            [].slice.call( fld.querySelectorAll( 'ul > li' ) ).forEach( function( inp ) {
                                inp.addEventListener( 'click', function(ev) { self._nextField(); } );
                            } );
                            break;
                        */
                }
            }
        });

        // keyboard navigation events - jump to next field when pressing enter
        document.addEventListener('keydown', function(ev) {
            if (!self.isLastStep && ev.target.tagName.toLowerCase() !== 'textarea') {
                var keyCode = ev.keyCode || ev.which;
                if (keyCode === 13) {
                    ev.preventDefault();
                    var flodata = document.getElementById('q1');
                    var result = parse_flodata(flodata.value);
                    console.log(result);
                    self._nextField(undefined, result);
                }
            }
        });
    };

    /**
     * nextField function
     * jumps to the next field
     */
    FForm.prototype._nextField = function(backto, result) {
        if (this.isLastStep || !this._validade() || this.isAnimating) {
            return false;
        }
        this.isAnimating = true;

        // check if on last step
        this.isLastStep = this.current === this.fieldsCount - 1 && backto === undefined ? true : false;

        // clear any previous error messages
        this._clearError();

        // current field
        var currentFld = this.fields[this.current];

        // save the navigation direction
        this.navdir = backto !== undefined ? backto < this.current ? 'prev' : 'next' : 'next';

        // update current field
        this.current = backto !== undefined ? backto : this.current + 1;

        if (backto === undefined) {
            // update progress bar (unless we navigate backwards)
            this._progress();

            // save farthest position so far
            this.farthest = this.current;
        }

        // add class "fs-display-next" or "fs-display-prev" to the list of fields
        classie.add(this.fieldsList, 'fs-display-' + this.navdir);

        // remove class "fs-current" from current field and add it to the next one
        // also add class "fs-show" to the next field and the class "fs-hide" to the current one
        classie.remove(currentFld, 'fs-current');
        classie.add(currentFld, 'fs-hide');

        if (!this.isLastStep) {
            // update nav
            this._updateNav();

            // change the current field number/status
            this._updateFieldNumber();

            var nextField = this.fields[this.current];
            classie.add(nextField, 'fs-current');
            classie.add(nextField, 'fs-show');
        }

        // after animation ends remove added classes from fields
        var self = this,
            onEndAnimationFn = function(ev) {
                if (support.animations) {
                    this.removeEventListener(animEndEventName, onEndAnimationFn);
                }

                classie.remove(self.fieldsList, 'fs-display-' + self.navdir);
                classie.remove(currentFld, 'fs-hide');

                if (self.isLastStep) {
                    // show the complete form and hide the controls
                    self._hideCtrl(self.ctrlNav);
                    self._hideCtrl(self.ctrlProgress);
                    self._hideCtrl(self.ctrlContinue);
                    self._hideCtrl(self.ctrlFldStatus);
                    // replace class fs-form-full with fs-form-overview
                    classie.remove(self.formEl, 'fs-form-full');
                    classie.add(self.formEl, 'fs-form-overview');
                    classie.add(self.formEl, 'fs-show');
                    classie.add(self.formEl, 'hideElement');

                    // Result display page
                    var div = document.createElement("div");
                    div.setAttribute("id", "resultPage");
                    div.setAttribute("class", "fs-form fs-form-overview fs-show");

                    var judgement = document.createElement("div");
                    judgement.setAttribute("class", "show-result");

                    var ol = document.createElement('ol');
                    ol.setAttribute("class", "fs-fields");

                    if (result['type'] == 'transfer') {
                        var fieldnames = [ { 'Type': 'Transfer' }, { 'Token name': result['tokenIdentification'] }, { 'Transfer amount': result['tokenAmount'] }, {'Original FLO data': result['flodata'] }];
                        judgement.innerHTML = 'Passed!';
                    } else if (result['type'] == 'tokenIncorporation') {
                        var fieldnames = [{ 'Type': 'Incorporation' }, { 'Token name': result['tokenIdentification'] }, { 'Incorporation amount': result['tokenAmount'] }, {'Original FLO data': result['flodata'] }];
                        judgement.innerHTML = 'Passed!';
                    } else {
                        var fieldnames = [{ 'Type': 'Noise' }, {'Original FLO data': result['flodata'] }];
                        judgement.innerHTML = 'Parsing failed!';
                    }

                    for (var i = 0; i < fieldnames.length; i++) {
                        var item = document.createElement('li');
                        var label = document.createElement('label');
                        label.setAttribute('class', 'fs-field-label fs-anim-upper');
                        label.setAttribute('for', 'q' + i.toString());
                        label.innerHTML = Object.keys(fieldnames[i])[0]
                        var input = document.createElement('input');
                        input.setAttribute('class', 'fs-anim-lower');
                        input.setAttribute("id", 'q' + i.toString());
                        input.setAttribute("name", 'q' + i.toString());
                        input.setAttribute("readonly", "readonly");
                        input.setAttribute("type", "text");
                        input.setAttribute("value", fieldnames[i][label.innerHTML]);
                        item.appendChild(label);
                        item.appendChild(input);
                        ol.appendChild(item);
                    }

                    var returnButton = document.createElement('button');
                    returnButton.setAttribute('class', 'fs-submit');
                    returnButton.setAttribute('type', 'submit');
                    returnButton.innerHTML = 'Go Back';
                    returnButton.onclick = function() {
                        location.href = "index.html";
                    };

                    div.appendChild(judgement)
                    div.appendChild(ol);
                    div.appendChild(returnButton);
                    var formElement = document.getElementById('myform');
                    formElement.insertAdjacentElement('afterend', div);

                    // callback
                    self.options.onReview();
                } else {
                    classie.remove(nextField, 'fs-show');

                    if (self.options.ctrlNavPosition) {
                        self.ctrlFldStatusCurr.innerHTML = self.ctrlFldStatusNew.innerHTML;
                        self.ctrlFldStatus.removeChild(self.ctrlFldStatusNew);
                        classie.remove(self.ctrlFldStatus, 'fs-show-' + self.navdir);
                    }
                }
                self.isAnimating = false;
            };

        if (support.animations) {
            if (this.navdir === 'next') {
                if (this.isLastStep) {
                    currentFld.querySelector('.fs-anim-upper').addEventListener(animEndEventName, onEndAnimationFn);
                } else {
                    nextField.querySelector('.fs-anim-lower').addEventListener(animEndEventName, onEndAnimationFn);
                }
            } else {
                nextField.querySelector('.fs-anim-upper').addEventListener(animEndEventName, onEndAnimationFn);
            }
        } else {
            onEndAnimationFn();
        }
    }

    /**
     * showField function
     * jumps to the field at position pos
     */
    FForm.prototype._showField = function(pos) {
        if (pos === this.current || pos < 0 || pos > this.fieldsCount - 1) {
            return false;
        }
        this._nextField(pos);
    }

    /**
     * updateFieldNumber function
     * changes the current field number
     */
    FForm.prototype._updateFieldNumber = function() {
        if (this.options.ctrlNavPosition) {
            // first, create next field number placeholder
            this.ctrlFldStatusNew = document.createElement('span');
            this.ctrlFldStatusNew.className = 'fs-number-new';
            this.ctrlFldStatusNew.innerHTML = Number(this.current + 1);

            // insert it in the DOM
            this.ctrlFldStatus.appendChild(this.ctrlFldStatusNew);

            // add class "fs-show-next" or "fs-show-prev" depending on the navigation direction
            var self = this;
            setTimeout(function() {
                classie.add(self.ctrlFldStatus, self.navdir === 'next' ? 'fs-show-next' : 'fs-show-prev');
            }, 25);
        }
    }

    /**
     * progress function
     * updates the progress bar by setting its width
     */
    FForm.prototype._progress = function() {
        if (this.options.ctrlProgress) {
            this.ctrlProgress.style.width = this.current * (100 / this.fieldsCount) + '%';
        }
    }

    /**
     * updateNav function
     * updates the navigation dots
     */
    FForm.prototype._updateNav = function() {
        if (this.options.ctrlNavDots) {
            classie.remove(this.ctrlNav.querySelector('button.fs-dot-current'), 'fs-dot-current');
            classie.add(this.ctrlNavDots[this.current], 'fs-dot-current');
            this.ctrlNavDots[this.current].disabled = false;
        }
    }

    /**
     * showCtrl function
     * shows a control
     */
    FForm.prototype._showCtrl = function(ctrl) {
        classie.add(ctrl, 'fs-show');
    }

    /**
     * hideCtrl function
     * hides a control
     */
    FForm.prototype._hideCtrl = function(ctrl) {
        classie.remove(ctrl, 'fs-show');
    }

    // TODO: this is a very basic validation function. Only checks for required fields..
    FForm.prototype._validade = function() {
        var fld = this.fields[this.current],
            input = fld.querySelector('input[required]') || fld.querySelector('textarea[required]') || fld.querySelector('select[required]'),
            error;

        if (!input) return true;

        switch (input.tagName.toLowerCase()) {
            case 'input':
                if (input.type === 'radio' || input.type === 'checkbox') {
                    var checked = 0;
                    [].slice.call(fld.querySelectorAll('input[type="' + input.type + '"]')).forEach(function(inp) {
                        if (inp.checked) {
                            ++checked;
                        }
                    });
                    if (!checked) {
                        error = 'NOVAL';
                    }
                } else if (input.value === '') {
                    error = 'NOVAL';
                }
                break;

            case 'select':
                // assuming here '' or '-1' only
                if (input.value === '' || input.value === '-1') {
                    error = 'NOVAL';
                }
                break;

            case 'textarea':
                if (input.value === '') {
                    error = 'NOVAL';
                }
                break;
        }

        if (error != undefined) {
            this._showError(error);
            return false;
        }

        return true;
    }

    // TODO
    FForm.prototype._showError = function(err) {
        var message = '';
        switch (err) {
            case 'NOVAL':
                message = 'Please fill the field before continuing';
                break;
            case 'INVALIDEMAIL':
                message = 'Please fill a valid email address';
                break;
                // ...
        };
        this.msgError.innerHTML = message;
        this._showCtrl(this.msgError);
    }

    // clears/hides the current error message
    FForm.prototype._clearError = function() {
        this._hideCtrl(this.msgError);
    }

    // add to global namespace
    window.FForm = FForm;


})(window);