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/*

Plugin Name: amCharts Data Loader

Description: This plugin adds external data loading capabilities to all amCharts libraries.

Author: Martynas Majeris, amCharts

Version: 1.0.12

Author URI: http://www.amcharts.com/

Copyright 2015 amCharts

Licensed under the Apache License, Version 2.0 (the "License");

you may not use this file except in compliance with the License.

You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software

distributed under the License is distributed on an "AS IS" BASIS,

WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

See the License for the specific language governing permissions and

limitations under the License.

Please note that the above license covers only this plugin. It by all means does

not apply to any other amCharts products that are covered by different licenses.

*/

/**

 * TODO:

 * incremental load

 * XML support (?)

 */

/* globals AmCharts, ActiveXObject */

/* jshint -W061 */

/**

 * Initialize language prompt container

 */

AmCharts.translations.dataLoader = {};

/**

 * Set init handler

 */

AmCharts.addInitHandler( function( chart ) {

  /**

   * Check if dataLoader is set (initialize it)

   */

  if ( undefined === chart.dataLoader || !isObject( chart.dataLoader ) )

    chart.dataLoader = {};

  /**

   * Check charts version for compatibility:

   * the first compatible version is 3.13

   */

  var version = chart.version.split( '.' );

  if ( ( Number( version[ 0 ] ) < 3 ) || ( 3 === Number( version[ 0 ] ) && ( Number( version[ 1 ] ) < 13 ) ) )

    return;

  /**

   * Define object reference for easy access

   */

  var l = chart.dataLoader;

  l.remaining = 0;

  /**

   * Set defaults

   */

  var defaults = {

    'async': true,

    'format': 'json',

    'showErrors': true,

    'showCurtain': true,

    'noStyles': false,

    'reload': 0,

    'timestamp': false,

    'delimiter': ',',

    'skip': 0,

    'skipEmpty': true,

    'useColumnNames': false,

    'reverse': false,

    'reloading': false,

    'complete': false,

    'error': false,

    'headers': [],

    'chart': chart

  };

  /**

   * Create a function that can be used to load data (or reload via API)

   */

  l.loadData = function() {

    /**

     * Load all files in a row

     */

    if ( 'stock' === chart.type ) {

      // delay this a little bit so the chart has the chance to build itself

      setTimeout( function() {

        // preserve animation

        if ( 0 > chart.panelsSettings.startDuration ) {

          l.startDuration = chart.panelsSettings.startDuration;

          chart.panelsSettings.startDuration = 0;

        }

        // cycle through all of the data sets

        for ( var x = 0; x < chart.dataSets.length; x++ ) {

          var ds = chart.dataSets[ x ];

          // load data

          if ( undefined !== ds.dataLoader && undefined !== ds.dataLoader.url ) {

            ds.dataProvider = [];

            applyDefaults( ds.dataLoader );

            loadFile( ds.dataLoader.url, ds, ds.dataLoader, 'dataProvider' );

          }

          // load events data

          if ( undefined !== ds.eventDataLoader && undefined !== ds.eventDataLoader.url ) {

            ds.events = [];

            applyDefaults( ds.eventDataLoader );

            loadFile( ds.eventDataLoader.url, ds, ds.eventDataLoader, 'stockEvents' );

          }

        }

      }, 100 );

    } else {

      applyDefaults( l );

      if ( undefined === l.url )

        return;

      // preserve animation

      if ( undefined !== chart.startDuration && ( 0 < chart.startDuration ) ) {

        l.startDuration = chart.startDuration;

        chart.startDuration = 0;

      }

      if ( 'gauge' === chart.type ) {

        // set empty data set

        if ( undefined === chart.arrows )

          chart.arrows = [];

        loadFile( l.url, chart, l, 'arrows' );

      } else {

        // set empty data set

        if ( undefined === chart.dataProvider )

          chart.dataProvider = chart.type === 'map' ? {} : [];

        loadFile( l.url, chart, l, 'dataProvider' );

      }

    }

  };

  /**

   * Trigger load

   */

  l.loadData();

  /**

   * Loads a file and determines correct parsing mechanism for it

   */

  function loadFile( url, holder, options, providerKey ) {

    // set default providerKey

    if ( undefined === providerKey )

      providerKey = 'dataProvider';

    // show curtain

    if ( options.showCurtain )

      showCurtain( undefined, options.noStyles );

    // increment loader count

    l.remaining++;

    // load the file

    AmCharts.loadFile( url, options, function( response ) {

      // error?

      if ( false === response ) {

        callFunction( options.error, options, chart );

        raiseError( AmCharts.__( 'Error loading the file', chart.language ) + ': ' + url, false, options );

      } else {

        // determine the format

        if ( undefined === options.format ) {

          // TODO

          options.format = 'json';

        }

        // lowercase

        options.format = options.format.toLowerCase();

        // invoke parsing function

        switch ( options.format ) {

          case 'json':

            holder[ providerKey ] = AmCharts.parseJSON( response );

            if ( false === holder[ providerKey ] ) {

              callFunction( options.error, options, chart );

              raiseError( AmCharts.__( 'Error parsing JSON file', chart.language ) + ': ' + l.url, false, options );

              holder[ providerKey ] = [];

              return;

            } else {

              holder[ providerKey ] = postprocess( holder[ providerKey ], options );

              callFunction( options.load, options, chart );

            }

            break;

          case 'csv':

            holder[ providerKey ] = AmCharts.parseCSV( response, options );

            if ( false === holder[ providerKey ] ) {

              callFunction( options.error, options, chart );

              raiseError( AmCharts.__( 'Error parsing CSV file', chart.language ) + ': ' + l.url, false, options );

              holder[ providerKey ] = [];

              return;

            } else {

              holder[ providerKey ] = postprocess( holder[ providerKey ], options );

              callFunction( options.load, options, chart );

            }

            break;

          default:

            callFunction( options.error, options, chart );

            raiseError( AmCharts.__( 'Unsupported data format', chart.language ) + ': ' + options.format, false, options.noStyles );

            return;

        }

        // decrement remaining counter

        l.remaining--;

        // we done?

        if ( 0 === l.remaining ) {

          // callback

          callFunction( options.complete, chart );

          // take in the new data

          if ( options.async ) {

            if ( 'map' === chart.type ) {

              // take in new data

              chart.validateNow( true );

              // remove curtain

              removeCurtain();

            } else {

              // add a dataUpdated event to handle post-load stuff

              if ( 'gauge' !== chart.type ) {

                chart.addListener( "dataUpdated", function( event ) {

                  // restore default period (stock chart)

                  if ( 'stock' === chart.type && !options.reloading && undefined !== chart.periodSelector ) {

                    chart.periodSelector.setDefaultPeriod();

                  }

                  // remove curtain

                  removeCurtain();

                  // remove this listener

                  chart.events.dataUpdated.pop();

                } );

              }

              // take in new data

              chart.validateData();

              // invalidate size for the pie chart

              // disabled for now as it is not longer necessary

              /*if ( 'pie' === chart.type && chart.invalidateSize !== undefined )

                chart.invalidateSize();*/

              // gauge chart does not trigger dataUpdated event

              // let's explicitly remove the curtain for it

              if ( 'gauge' === chart.type )

                removeCurtain();

              // make the chart animate again

              if ( l.startDuration ) {

                if ( 'stock' === chart.type ) {

                  chart.panelsSettings.startDuration = l.startDuration;

                  for ( var x = 0; x < chart.panels.length; x++ ) {

                    chart.panels[ x ].startDuration = l.startDuration;

                    chart.panels[ x ].animateAgain();

                  }

                } else {

                  chart.startDuration = l.startDuration;

                  if ( chart.animateAgain !== undefined )

                    chart.animateAgain();

                }

              }

            }

          }

        }

        // schedule another load if necessary

        if ( options.reload ) {

          if ( options.timeout )

            clearTimeout( options.timeout );

          options.timeout = setTimeout( loadFile, 1000 * options.reload, url, holder, options );

          options.reloading = true;

        }

      }

    } );

  }

  /**

   * Checks if postProcess is set and invokes the handler

   */

  function postprocess( data, options ) {

    if ( undefined !== options.postProcess && isFunction( options.postProcess ) )

      try {

        return options.postProcess.call( l, data, options, chart );

      } catch ( e ) {

        raiseError( AmCharts.__( 'Error loading file', chart.language ) + ': ' + options.url, false, options );

        return data;

      } else

        return data;

  }

  /**

   * Returns true if argument is array

   */

  function isObject( obj ) {

    return 'object' === typeof( obj );

  }

  /**

   * Returns true is argument is a function

   */

  function isFunction( obj ) {

    return 'function' === typeof( obj );

  }

  /**

   * Applies defaults to config object

   */

  function applyDefaults( obj ) {

    for ( var x in defaults ) {

      if ( defaults.hasOwnProperty( x ) )

        setDefault( obj, x, defaults[ x ] );

    }

  }

  /**

   * Checks if object property is set, sets with a default if it isn't

   */

  function setDefault( obj, key, value ) {

    if ( undefined === obj[ key ] )

      obj[ key ] = value;

  }

  /**

   * Raises an internal error (writes it out to console)

   */

  function raiseError( msg, error, options ) {

    if ( options.showErrors )

      showCurtain( msg, options.noStyles );

    else {

      removeCurtain();

      console.log( msg );

    }

  }

  /**

   * Shows curtain over chart area

   */

  function showCurtain( msg, noStyles ) {

    // remove previous curtain if there is one

    removeCurtain();

    // did we pass in the message?

    if ( undefined === msg )

      msg = AmCharts.__( 'Loading data...', chart.language );

    // create and populate curtain element

    var curtain = document.createElement( 'div' );

    curtain.setAttribute( 'id', chart.div.id + '-curtain' );

    curtain.className = 'amcharts-dataloader-curtain';

    if ( true !== noStyles ) {

      curtain.style.position = 'absolute';

      curtain.style.top = 0;

      curtain.style.left = 0;

      curtain.style.width = ( undefined !== chart.realWidth ? chart.realWidth : chart.divRealWidth ) + 'px';

      curtain.style.height = ( undefined !== chart.realHeight ? chart.realHeight : chart.divRealHeight ) + 'px';

      curtain.style.textAlign = 'center';

      curtain.style.display = 'table';

      curtain.style.fontSize = '20px';

      try {

        curtain.style.background = 'rgba(255, 255, 255, 0.3)';

      } catch ( e ) {

        curtain.style.background = 'rgb(255, 255, 255)';

      }

      curtain.innerHTML = '<div style="display: table-cell; vertical-align: middle;">' + msg + '</div>';

    } else {

      curtain.innerHTML = msg;

    }

    chart.containerDiv.appendChild( curtain );

    l.curtain = curtain;

  }

  /**

   * Removes the curtain

   */

  function removeCurtain() {

    try {

      if ( undefined !== l.curtain )

        chart.containerDiv.removeChild( l.curtain );

    } catch ( e ) {

      // do nothing

    }

    l.curtain = undefined;

  }

  /**

   * Execute callback function

   */

  function callFunction( func, param1, param2, param3 ) {

    if ( 'function' === typeof func )

      func.call( l, param1, param2, param3 );

  }

}, [ 'pie', 'serial', 'xy', 'funnel', 'radar', 'gauge', 'gantt', 'stock', 'map' ] );

/**

 * Returns prompt in a chart language (set by chart.language) if it is

 * available

 */

if ( undefined === AmCharts.__ ) {

  AmCharts.__ = function( msg, language ) {

    if ( undefined !== language && undefined !== AmCharts.translations.dataLoader[ language ] && undefined !== AmCharts.translations.dataLoader[ language ][ msg ] )

      return AmCharts.translations.dataLoader[ language ][ msg ];

    else

      return msg;

  };

}

/**

 * Loads a file from url and calls function handler with the result

 */

AmCharts.loadFile = function( url, options, handler ) {

  // prepopulate options with minimal defaults if necessary

  if ( typeof( options ) !== "object" )

    options = {};

  if ( options.async === undefined )

    options.async = true;

  // create the request

  var request;

  if ( window.XMLHttpRequest ) {

    // IE7+, Firefox, Chrome, Opera, Safari

    request = new XMLHttpRequest();

  } else {

    // code for IE6, IE5

    request = new ActiveXObject( 'Microsoft.XMLHTTP' );

  }

  // open the connection

  try {

    request.open( 'GET', options.timestamp ? AmCharts.timestampUrl( url ) : url, options.async );

  } catch ( e ) {

    handler.call( this, false );

  }

  // add headers?

  if ( options.headers !== undefined && options.headers.length ) {

    for ( var i = 0; i < options.headers.length; i++ ) {

      var header = options.headers[ i ];

      request.setRequestHeader( header.key, header.value );

    }

  }

  // set handler for data if async loading

  request.onreadystatechange = function() {

    if ( 4 === request.readyState && 404 === request.status )

      handler.call( this, false );

    else if ( 4 === request.readyState && 200 === request.status )

      handler.call( this, request.responseText );

  };

  // load the file

  try {

    request.send();

  } catch ( e ) {

    handler.call( this, false );

  }

};

/**

 * Parses JSON string into an object

 */

AmCharts.parseJSON = function( response ) {

  try {

    if ( undefined !== JSON )

      return JSON.parse( response );

    else

      return eval( response );

  } catch ( e ) {

    return false;

  }

};

/**

 * Prases CSV string into an object

 */

AmCharts.parseCSV = function( response, options ) {

  // parse CSV into array

  var data = AmCharts.CSVToArray( response, options.delimiter );

  // init resuling array

  var res = [];

  var cols = [];

  var col, i;

  // first row holds column names?

  if ( options.useColumnNames ) {

    cols = data.shift();

    // normalize column names

    for ( var x = 0; x < cols.length; x++ ) {

      // trim

      col = cols[ x ].replace( /^\s+|\s+$/gm, '' );

      // check for empty

      if ( '' === col )

        col = 'col' + x;

      cols[ x ] = col;

    }

    if ( 0 < options.skip )

      options.skip--;

  }

  // skip rows

  for ( i = 0; i < options.skip; i++ )

    data.shift();

  // iterate through the result set

  var row;

  while ( ( row = options.reverse ? data.pop() : data.shift() ) ) {

    if ( options.skipEmpty && row.length === 1 && row[ 0 ] === '' )

      continue;

    var dataPoint = {};

    for ( i = 0; i < row.length; i++ ) {

      col = undefined === cols[ i ] ? 'col' + i : cols[ i ];

      dataPoint[ col ] = row[ i ];

    }

    res.push( dataPoint );

  }

  return res;

};

/**

 * Parses CSV data into array

 * Taken from here: (thanks!)

 * http://www.bennadel.com/blog/1504-ask-ben-parsing-csv-strings-with-javascript-exec-regular-expression-command.htm

 */

AmCharts.CSVToArray = function( strData, strDelimiter ) {

  // Check to see if the delimiter is defined. If not,

  // then default to comma.

  strDelimiter = ( strDelimiter || "," );

  // Create a regular expression to parse the CSV values.

  var objPattern = new RegExp(

    (

      // Delimiters.

      "(\\" + strDelimiter + "|\\r?\\n|\\r|^)" +

      // Quoted fields.

      "(?:\"([^\"]*(?:\"\"[^\"]*)*)\"|" +

      // Standard fields.

      "([^\"\\" + strDelimiter + "\\r\\n]*))"

    ),

    "gi"

  );

  // Create an array to hold our data. Give the array

  // a default empty first row.

  var arrData = [

    []

  ];

  // Create an array to hold our individual pattern

  // matching groups.

  var arrMatches = null;

  // Keep looping over the regular expression matches

  // until we can no longer find a match.

  while ( ( arrMatches = objPattern.exec( strData ) ) ) {

    // Get the delimiter that was found.

    var strMatchedDelimiter = arrMatches[ 1 ];

    // Check to see if the given delimiter has a length

    // (is not the start of string) and if it matches

    // field delimiter. If id does not, then we know

    // that this delimiter is a row delimiter.

    if (

      strMatchedDelimiter.length &&

      ( strMatchedDelimiter !== strDelimiter )

    ) {

      // Since we have reached a new row of data,

      // add an empty row to our data array.

      arrData.push( [] );

    }

    // Now that we have our delimiter out of the way,

    // let's check to see which kind of value we

    // captured (quoted or unquoted).

    var strMatchedValue;

    if ( arrMatches[ 2 ] ) {

      // We found a quoted value. When we capture

      // this value, unescape any double quotes.

      strMatchedValue = arrMatches[ 2 ].replace(

        new RegExp( "\"\"", "g" ),

        "\""

      );

    } else {

      // We found a non-quoted value.

      strMatchedValue = arrMatches[ 3 ];

    }

    // Now that we have our value string, let's add

    // it to the data array.

    arrData[ arrData.length - 1 ].push( strMatchedValue );

  }

  // Return the parsed data.

  return ( arrData );

};

/**

 * Appends timestamp to the url

 */

AmCharts.timestampUrl = function( url ) {

  var p = url.split( '?' );

  if ( 1 === p.length )

    p[ 1 ] = new Date().getTime();

  else

    p[ 1 ] += '&' + new Date().getTime();

  return p.join( '?' );

};