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var DEBUG = false;

// User info retrieved from chats is store in this object
var context = {};

// Cache conversation position
var conversationPos;

/*
---------------
Utility Functions
---------------
*/

function getCurrentTime() {
  var date = new Date();
  var hours = date.getHours();
  var minutes = date.getMinutes();
  var ampm = hours >= 12 ? 'PM' : 'AM';
  hours = hours % 12;
  hours = hours ? hours : 12;
  minutes = minutes < 10 ? '0'+minutes : minutes;
  var strTime = hours + ':' + minutes + ' ' + ampm;
  return strTime;
}

/**
 * Cast string
 * 
 * @param string value
 * @returns string
 */
function _phpCastString (value) {
    var type = typeof value

switch (type) {
      case 'boolean':
        return value ? '1' : ''
      case 'string':
        return value
      case 'number':
        if (isNaN(value)) {
          return 'NAN'
        }

if (!isFinite(value)) {
          return (value < 0 ? '-' : '') + 'INF'
        }

return value + ''
      case 'undefined':
        return ''
      case 'object':
        if (Array.isArray(value)) {
          return 'Array'
        }

if (value !== null) {
          return 'Object'
        }

return ''
      case 'function':
        // fall through
      default:
        throw new Error('Unsupported value type')
    }
}

/**
 * Strip tags from a string
 * 
 * big thanks to http://locutus.io/php/strings/strip_tags/
 * 
 * @param string input
 * @param string allowed
 * @returns string
 */
function strip_tags (input, allowed) {
    // making sure the allowed arg is a string containing only tags in lowercase (<a><b><c>)
    allowed = (((allowed || '') + '').toLowerCase().match(/<[a-z][a-z0-9]*>/g) || []).join('')

var tags = /<\/?([a-z0-9]*)\b[^>]*>?/gi
    var commentsAndPhpTags = /|<\?(?:php)?[\s\S]*?\?>/gi

var after = _phpCastString(input)
    // removes tha '<' char at the end of the string to replicate PHP's behaviour
    after = (after.substring(after.length - 1) === '<') ? after.substring(0, after.length - 1) : after

// recursively remove tags to ensure that the returned string doesn't contain forbidden tags after previous passes (e.g. '<<bait/>switch/>')
    while (true) {
      var before = after
      after = before.replace(commentsAndPhpTags, '').replace(tags, function ($0, $1) {
        return allowed.indexOf('<' + $1.toLowerCase() + '>') > -1 ? $0 : ''
      })

// return once no more tags are removed
      if (before === after) {
        return after
      }
    }
}

function renderStatement(statement) {
    // Strip html tags from statement
    statement = strip_tags(statement);
  
    jQuery('.chat-container').append('<div class="chat-message-wrapper"><div class="absolute-wrapper"><div class="message-details"><div class="bot-avatar"></div><span class="message-date">' + getCurrentTime() + '</span></div></div><p class="chat-message">' + statement + '</p></div>');
}

function showTyping() {
    jQuery('.chat-container').append('<div class="typing-wrapper"><div class="bot-avatar"></div><span class="bot-name">' + botName +'</span><p class="chat-message typing"><span class="dot"></span><span class="dot"></span><span class="dot"></span></p></div>');
}

function hideTyping() {
    jQuery('.typing-wrapper').remove();
}

var chatWrapper = jQuery('.bot-chat-wrapper');

function scrollToBottom() {
    chatWrapper.animate({
      scrollTop: 600
    }, "slow");
}

/**
 * Input checking
 */
function inputError(msg) {
    jQuery('.bot-error p').text(msg);
    jQuery('.bot-error')
    .animate({bottom: 0}, 500)
    .delay(3000)
    .animate({bottom: "-70px"}, 500);
}

function checkInput(option) {
    var input = jQuery('.bot-container input[type=text]').val();
   
    // Strip html tags from input
    input = strip_tags(input);

if (input.length > 2) {
        showResponse(option);
    } else {
        inputError(botVars.validationName);
    }
    
    return false;
}

if (input.length > 7 && result === true) {

// Add new entry to our db
        var bot_user_email = jQuery('.bot-container input[type=email]').serialize();
        var subscribe_bot_data = 'action=wpmm_add_subscriber&' + bot_user_email;

jQuery.post(wpmm_vars.ajax_url, subscribe_bot_data, function(response) {
            if (!response.success) {
                alert(response.data);
                return false;
            }
        }, 'json');

showResponse(option);

} else {
        inputError(botVars.validationEmail);
    }
    return false;
}

function clearChat() {
    jQuery('.chat-container').empty();
}

function clearFooter() {
    jQuery('.choices').empty();
    jQuery('.input').empty();
}

/*
------------------------
Setup Conversation Data
------------------------
*/

function startConversation(conv, pos) {

clearFooter();
    clearChat();

// Set conversation position
    // 'conversation' is in the global scope
    conversationPos = conv;

// Load conversation data
    jQuery.getScript( botVars.uploadsBaseUrl + "data.js", function( data ) {
    // Show first bot statement
    showStatement(pos);

});

}

/*
-------------------
Show Bot Statement
-------------------
*/
function showStatement(pos) {

// Where are we in conversationData?
    var node = conversationData[conversationPos][pos];

// If there is a side effect execute that within the context
    if ('sideeffect' in node && jQuery.type(node['sideeffect'] === "function")) {
        node['sideeffect'](context);
    }

// Wrap the statements in an array (if they're not already)
    var statements;
    if (jQuery.type(node['statement']) === "array") {
        statements = node['statement'];
    } else if (jQuery.type(node['statement']) === "string") {
        statements = [node['statement']];
    } else if (jQuery.type(node['statement']) === "function") {
        statements = node['statement'](context);
    }

/*
    ------------------------
    Render Bot Statement(s)
    ------------------------
    Run this function over each statement
    */
    async.eachSeries(statements, function(item, callback) {
        // Emulate typing then scroll to bottom
        showTyping();
        scrollToBottom();

// Create random delay
        // If statement is short, delay 1.8 seconds
        // Else, random delay based on statement length
        if (item.length <= 50) {
            var delay = 1800;
        } else {
            var delay = (item.length / 3) * 30 * (Math.floor(Math.random() * 5) + 1.2);
        }

if (DEBUG) { delay = 0; }

setTimeout(function() {
            hideTyping();
            renderStatement(item);
            scrollToBottom();

callback();
        }, delay);
    },

/*
    ----------------------
    Render User Option(s)
    ----------------------
    This is the final callback of the series
    */
    function (err) {

/*
        ----------------------------
        If User Option is Button(s)
        ----------------------------
        */
        if ('options' in node) {
            jQuery('.input').hide();
            jQuery('.choices').show();

// Get the options' data
            var options = node["options"];

// If there are options render them
            // Otherwise this is the end
            if (options.length > 0) {

// Pause 750ms, then render options
                setTimeout(function() {

for (var i = 0; i < options.length; i++) {
                        var option = options[i];
                        var extraClass;
                        var clickFunction;

// Check option for a consequence
                        if (option['consequence'] === null) {

// The consequence is null meaning this is a branch we won't be exploring
                            // The button is given class 'disabled' and does nothing on click
                            clickFunction = null;
                            extraClass = "disabled";

} else {

// Else, click function (showResponse) is binded to it
                            clickFunction = function(option) {
                                showResponse(option);
                            }.bind(null, option);

extraClass = "";

}

// Render button
                        var button = jQuery('<p/>', {
                            text: option['choice'],
                            "class": "chat-message user",
                            click: clickFunction
                        }).appendTo('.choices');
                    }

}, 750);

}

/*
        ------------------------
        If User Option is Input
        ------------------------
        */
        } else if ('input' in node) {
            jQuery('.input').show();
            jQuery('.choices').hide();

var option = node['input'];

/*
            Render Input
            ---------------
            */

// Create a form to hold our input and submit button
            var form = jQuery('<form/>', {
                submit: checkInput.bind(null, option)
            });

// Create a user bubble, append to form
            var inputBubble = jQuery('<p/>', {
                "class": "chat-message user"
            }).appendTo(form);

// Create an input, append to user bubble
            var input = jQuery('<input/>', {
                type: 'text',
                placeholder: botVars.typeName,
                name: option['name'],
                autocomplete: 'off',
                required: true
            }).appendTo(inputBubble);

// Create an input button, append to user bubble
            var button = jQuery('<a/>', {
                text: botVars.send,
                click: checkInput.bind(null, option)
            }).appendTo(inputBubble);

// Append form to div.input
            form.appendTo('.input');

// Focus on the input we just put into the DOM
            async.nextTick(function() {
                input.focus();
            });

/*
        ------------------------
        If User Option is Email
        ------------------------
        */
        } else if ('email' in node) {
            jQuery('.input').show();
            jQuery('.choices').hide();

var option = node['email'];

/*
            Render Input
            ---------------
            */

// Create a form to hold our input and submit button
            var form = jQuery('<form/>', {
                "class": "bot_subscribe_form",
                submit: checkEmail.bind(null, option)
            });

// Create a user bubble, append to form
            var inputBubble = jQuery('<p/>', {
                "class": "chat-message user"
            }).appendTo(form);

// Create email input, append to user bubble
            var input = jQuery('<input/>', {
                type: 'email',
                placeholder: botVars.typeEmail,
                name: option['email'],
                autocomplete: 'off'
            }).appendTo(inputBubble);

// Create an input button, append to user bubble
            var button = jQuery('<a/>', {
                text: botVars.send,
                // "class": "user-email-trigger",
                click: checkEmail.bind(null, option)
            }).appendTo(inputBubble);

// Append form to div.input
            form.appendTo('.input');

// Focus on the input we just put into the DOM
            async.nextTick(function() {
                input.focus();
            });

}

scrollToBottom();
    });
}

/*
---------------------
Render User Response
---------------------
*/
function showResponse(option) {

// If there was an input element, put that into the global context
    var feedback = "";

if ('name' in option) {
        context[option['name']] = jQuery('.bot-container input[type=text]').val();
        feedback = context[option['name']];
    }
    else if('email' in option) {
        context[option['email']] = jQuery('.bot-container input[type=email]').val();
        feedback = context[option['email']];
    }
    else {
        feedback = option['choice'];
    }
    
    clearFooter();
    
    // Strip html tags from feedback
    feedback = strip_tags(feedback);

// Show what the user chose
    jQuery(".chat-container").append('<p class="chat-message user">' + feedback + '</p>');

if ('consequence' in option) {
        showStatement(option['consequence']);
    } else {
      // xxx
    }
}