/**
 * 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 extractMarker(text) {
		var textList = text.split(' ');
		for (var i=0; i<textList.length; i++){
			if ( textList[i][textList[i].length-1] == '#') {
				return textList[i];
			}
		}
		return false;
	}

	function extractOperation(text) {
		var operationList = ['send', 'transfer', 'give']; // keep list's content lowercase
		var count = 0;
		var returnval;
		for (var i=0; i<operationList.length; i++){
			count += occurrences(text,operationList[i]);
			if (count>1){
				return 'too many';
			}
			if (count==1 && !returnval) {
				returnval = operationList[i];
			}
		}
		return returnval;
	}

	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 'Too many';
			}
		}
		return returnval;
	}

	function extractInitTokens(text){
		var base_units = {'thousand':10**3 , 'million':10**6 ,'billion':10**9, 'trillion':10**12};
		var textList = text.split(' ');
		for (var i=0; i<textList.length; i++){
			for (var j=0; j<base_units.length; j++){
				temp = textList[i].split(base_units[j]);
				if (temp.length==2 && temp[1]=='') {
					return parseFloat(temp[0])*base_units[base_units[j]]
				}
			}

			if (parseFloat(textList[i])){
				var result = parseFloat(textList[i]);
				if (base_units.hasOwnProperty(textList[i+1])){
					return result*base_units[textList[i+1]];
				}
				return result;
			}
		}
	}

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

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

		var parsed_data;

		if (isTransfer(cleanstring)) {
			var marker = extractMarker(cleanstring);
			var operation = extractOperation(cleanstring);
			var amount = extractAmount(cleanstring);
			parsed_data = {'type': 'transfer', 'flodata': flodata, 'marker': marker, 'operation': operation,
						   'amount': amount};
		} else if (isIncorp(cleanstring)) {
			var incMarker = extractMarker(cleanstring);
			var initTokens = extractInitTokens(cleanstring);
			parsed_data = {'type': 'incorporation', 'flodata': flodata, 'marker': incMarker, 'initTokens': initTokens}
		}
		else{
			parsed_data = {'type': 'noise', 'flodata': flodata}
		}

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

					if (result['type'] == 'transfer'){
						var fieldnames = [{'FLO data':result['flodata']},{'Type':'Transfer'},{'Identification':result['marker']},{'Amount':result['amount']}]
					}else if (result['type'] == 'incorporation'){
						var fieldnames = [{'FLO data':result['flodata']},{'Type':'Incorporation'},{'Identification':result['marker']},{'Amount':result['initTokens']}]
					}else{
						var fieldnames = [{'FLO data':result['flodata']},{'Type':'Noise'}]
					}

					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("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 = "http://ranchimall1.duckdns.org:5002";
					};

					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 );