/*! Responsive 1.0.1
 * 2014 SpryMedia Ltd - datatables.net/license
 */

/**
 * @summary     Responsive
 * @description Responsive tables plug-in for DataTables
 * @version     1.0.1
 * @file        dataTables.responsive.js
 * @author      SpryMedia Ltd (www.sprymedia.co.uk)
 * @contact     www.sprymedia.co.uk/contact
 * @copyright   Copyright 2014 SpryMedia Ltd.
 *
 * This source file is free software, available under the following license:
 *   MIT license - http://datatables.net/license/mit
 *
 * This source file is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the license files for details.
 *
 * For details please refer to: http://www.datatables.net
 */

(function(window, document, undefined) {


var factory = function( $, DataTable ) {
"use strict";

/**
 * Responsive is a plug-in for the DataTables library that makes use of
 * DataTables' ability to change the visibility of columns, changing the
 * visibility of columns so the displayed columns fit into the table container.
 * The end result is that complex tables will be dynamically adjusted to fit
 * into the viewport, be it on a desktop, tablet or mobile browser.
 *
 * Responsive for DataTables has two modes of operation, which can used
 * individually or combined:
 *
 * * Class name based control - columns assigned class names that match the
 *   breakpoint logic can be shown / hidden as required for each breakpoint.
 * * Automatic control - columns are automatically hidden when there is no
 *   room left to display them. Columns removed from the right.
 *
 * In additional to column visibility control, Responsive also has built into
 * options to use DataTables' child row display to show / hide the information
 * from the table that has been hidden. There are also two modes of operation
 * for this child row display:
 *
 * * Inline - when the control element that the user can use to show / hide
 *   child rows is displayed inside the first column of the table.
 * * Column - where a whole column is dedicated to be the show / hide control.
 *
 * Initialisation of Responsive is performed by:
 *
 * * Adding the class `responsive` or `dt-responsive` to the table. In this case
 *   Responsive will automatically be initialised with the default configuration
 *   options when the DataTable is created.
 * * Using the `responsive` option in the DataTables configuration options. This
 *   can also be used to specify the configuration options, or simply set to
 *   `true` to use the defaults.
 *
 *  @class
 *  @param {object} settings DataTables settings object for the host table
 *  @param {object} [opts] Configuration options
 *  @requires jQuery 1.7+
 *  @requires DataTables 1.10.1+
 *
 *  @example
 *      $('#example').DataTable( {
 *        responsive: true
 *      } );
 *    } );
 */
var Responsive = function ( settings, opts ) {
	// Sanity check that we are using DataTables 1.10 or newer
	if ( ! DataTable.versionCheck || ! DataTable.versionCheck( '1.10.1' ) ) {
		throw 'DataTables Responsive requires DataTables 1.10.1 or newer';
	}
	else if ( settings.responsive ) {
		return;
	}

	this.s = {
		dt: new DataTable.Api( settings ),
		columns: []
	};

	// details is an object, but for simplicity the user can give it as a string
	if ( opts && typeof opts.details === 'string' ) {
		opts.details = { type: opts.details };
	}

	this.c = $.extend( true, {}, Responsive.defaults, opts );
	settings.responsive = this;
	this._constructor();
};

Responsive.prototype = {
	/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
	 * Constructor
	 */

	/**
	 * Initialise the Responsive instance
	 *
	 * @private
	 */
	_constructor: function ()
	{
		var that = this;
		var dt = this.s.dt;

		dt.settings()[0]._responsive = this;

		// Use DataTables' private throttle function to avoid processor thrashing
		$(window).on( 'resize.dtr orientationchange.dtr', dt.settings()[0].oApi._fnThrottle( function () {
			that._resize();
		} ) );

		// Destroy event handler
		dt.on( 'destroy.dtr', function () {
			$(window).off( 'resize.dtr orientationchange.dtr' );
		} );

		// Reorder the breakpoints array here in case they have been added out
		// of order
		this.c.breakpoints.sort( function (a, b) {
			return a.width < b.width ? 1 :
				a.width > b.width ? -1 : 0;
		} );

		this._classLogic();
		this._resizeAuto();

		// First pass - draw the table for the current viewport size
		this._resize();

		// Details handler
		var details = this.c.details;
		if ( details.type ) {
			that._detailsInit();
			this._detailsVis();

			dt.on( 'column-visibility.dtr', function () {
				that._detailsVis();
			} );

			$(dt.table().node()).addClass( 'dtr-'+details.type );
		}
	},


	/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
	 * Private methods
	 */

	/**
	 * Calculate the visibility for the columns in a table for a given
	 * breakpoint. The result is pre-determined based on the class logic if
	 * class names are used to control all columns, but the width of the table
	 * is also used if there are columns which are to be automatically shown
	 * and hidden.
	 *
	 * @param  {string} breakpoint Breakpoint name to use for the calculation
	 * @return {array} Array of boolean values initiating the visibility of each
	 *   column.
	 *  @private
	 */
	_columnsVisiblity: function ( breakpoint )
	{
		var dt = this.s.dt;
		var columns = this.s.columns;
		var i, ien;

		// Class logic - determine which columns are in this breakpoint based
		// on the classes. If no class control (i.e. `auto`) then `-` is used
		// to indicate this to the rest of the function
		var display = $.map( columns, function ( col ) {
			return col.auto && col.minWidth === null ?
				false :
				col.auto === true ?
					'-' :
					col.includeIn.indexOf( breakpoint ) !== -1;
		} );

		// Auto column control - first pass: how much width is taken by the
		// ones that must be included from the non-auto columns
		var requiredWidth = 0;
		for ( i=0, ien=display.length ; i<ien ; i++ ) {
			if ( display[i] === true ) {
				requiredWidth += columns[i].minWidth;
			}
		}

		// Second pass, use up any remaining width for other columns
		var widthAvailable = dt.table().container().offsetWidth;
		var usedWidth = widthAvailable - requiredWidth;

		for ( i=0, ien=display.length ; i<ien ; i++ ) {
			// Control column needs to always be included. This makes it sub-
			// optimal in terms of using the available with, but to stop layout
			// thrashing or overflow
			if ( columns[i].control ) {
				usedWidth -= columns[i].minWidth;
			}
			else if ( display[i] === '-' ) {
				// Otherwise, remove the width
				display[i] = usedWidth - columns[i].minWidth < 0 ?
					false :
					true;

				// Continue counting down the width, so a smaller column to the
				// left won't be shown
				usedWidth -= columns[i].minWidth;
			}
		}

		// Determine if the 'control' column should be shown (if there is one).
		// This is the case when there is a hidden column (that is not the
		// control column). The two loops look inefficient here, but they are
		// trivial and will fly through. We need to know the outcome from the
		// first , before the action in the second can be taken
		var showControl = false;

		for ( i=0, ien=columns.length ; i<ien ; i++ ) {
			if ( ! columns[i].control && ! display[i] ) {
				showControl = true;
				break;
			}
		}

		for ( i=0, ien=columns.length ; i<ien ; i++ ) {
			if ( columns[i].control ) {
				display[i] = showControl;
			}
		}

		return display;
	},


	/**
	 * Create the internal `columns` array with information about the columns
	 * for the table. This includes determining which breakpoints the column
	 * will appear in, based upon class names in the column, which makes up the
	 * vast majority of this method.
	 *
	 * @private
	 */
	_classLogic: function ()
	{
		var that = this;
		var calc = {};
		var breakpoints = this.c.breakpoints;
		var columns = this.s.dt.columns().eq(0).map( function (i) {
			return {
				className: this.column(i).header().className,
				includeIn: [],
				auto:      false,
				control:   false
			};
		} );

		// Simply add a breakpoint to `includeIn` array, ensuring that there are
		// no duplicates
		var add = function ( colIdx, name ) {
			var includeIn = columns[ colIdx ].includeIn;

			if ( includeIn.indexOf( name ) === -1 ) {
				includeIn.push( name );
			}
		};

		var column = function ( colIdx, name, operator, matched ) {
			var size, i, ien;

			if ( ! operator ) {
				columns[ colIdx ].includeIn.push( name );
			}
			else if ( operator === 'max-' ) {
				// Add this breakpoint and all smaller
				size = that._find( name ).width;

				for ( i=0, ien=breakpoints.length ; i<ien ; i++ ) {
					if ( breakpoints[i].width <= size ) {
						add( colIdx, breakpoints[i].name );
					}
				}
			}
			else if ( operator === 'min-' ) {
				// Add this breakpoint and all larger
				size = that._find( name ).width;

				for ( i=0, ien=breakpoints.length ; i<ien ; i++ ) {
					if ( breakpoints[i].width >= size ) {
						add( colIdx, breakpoints[i].name );
					}
				}
			}
			else if ( operator === 'not-' ) {
				// Add all but this breakpoint (xxx need extra information)

				for ( i=0, ien=breakpoints.length ; i<ien ; i++ ) {
					if ( breakpoints[i].name.indexOf( matched ) === -1 ) {
						add( colIdx, breakpoints[i].name );
					}
				}
			}
		};

		// Loop over each column and determine if it has a responsive control
		// class
		columns.each( function ( col, i ) {
			var classNames = col.className.split(' ');
			var hasClass = false;

			// Split the class name up so multiple rules can be applied if needed
			for ( var k=0, ken=classNames.length ; k<ken ; k++ ) {
				var className = $.trim( classNames[k] );

				if ( className === 'all' ) {
					// Include in all
					hasClass = true;
					col.includeIn = $.map( breakpoints, function (a) {
						return a.name;
					} );
					return;
				}
				else if ( className === 'none' ) {
					// Include in none (default) and no auto
					hasClass = true;
					return;
				}
				else if ( className === 'control' ) {
					// Special column that is only visible, when one of the other
					// columns is hidden. This is used for the details control
					hasClass = true;
					col.control = true;
					return;
				}

				$.each( breakpoints, function ( j, breakpoint ) {
					// Does this column have a class that matches this breakpoint?
					var brokenPoint = breakpoint.name.split('-');
					var re = new RegExp( '(min\\-|max\\-|not\\-)?('+brokenPoint[0]+')(\\-[_a-zA-Z0-9])?' );
					var match = className.match( re );

					if ( match ) {
						hasClass = true;

						if ( match[2] === brokenPoint[0] && match[3] === '-'+brokenPoint[1] ) {
							// Class name matches breakpoint name fully
							column( i, breakpoint.name, match[1], match[2]+match[3] );
						}
						else if ( match[2] === brokenPoint[0] && ! match[3] ) {
							// Class name matched primary breakpoint name with no qualifier
							column( i, breakpoint.name, match[1], match[2] );
						}
					}
				} );
			}

			// If there was no control class, then automatic sizing is used
			if ( ! hasClass ) {
				col.auto = true;
			}
		} );

		this.s.columns = columns;
	},


	/**
	 * Initialisation for the details handler
	 *
	 * @private
	 */
	_detailsInit: function ()
	{
		var that    = this;
		var dt      = this.s.dt;
		var details = this.c.details;

		// The inline type always uses the first child as the target
		if ( details.type === 'inline' ) {
			details.target = 'td:first-child';
		}

		// type.target can be a string jQuery selector or a column index
		var target   = details.target;
		var selector = typeof target === 'string' ? target : 'td';

		// Click handler to show / hide the details rows when they are available
		$( dt.table().body() ).on( 'click', selector, function (e) {
			// If the table is not collapsed (i.e. there is no hidden columns)
			// then take no action
			if ( ! $(dt.table().node()).hasClass('collapsed' ) ) {
				return;
			}

			// For column index, we determine if we should act or not in the
			// handler - otherwise it is already okay
			if ( typeof target === 'number' ) {
				var targetIdx = target < 0 ?
					dt.columns().eq(0).length + target :
					target;

				if ( dt.cell( this ).index().column !== targetIdx ) {
					return;
				}
			}

			// $().closest() includes itself in its check
			var row = dt.row( $(this).closest('tr') );

			if ( row.child.isShown() ) {
				row.child( false );
				$( row.node() ).removeClass( 'parent' );
			}
			else {
				var info = that.c.details.renderer( dt, row[0] );
				row.child( info, 'child' ).show();
				$( row.node() ).addClass( 'parent' );
			}
		} );
	},


	/**
	 * Update the child rows in the table whenever the column visibility changes
	 *
	 * @private
	 */
	_detailsVis: function ()
	{
		var that = this;
		var dt = this.s.dt;

		var hiddenColumns = dt.columns(':hidden').indexes().flatten();
		var haveHidden = true;

		if ( hiddenColumns.length === 0 || ( hiddenColumns.length === 1 && this.s.columns[ hiddenColumns[0] ].control ) ) {
			haveHidden = false;
		}

		if ( haveHidden ) {
			// Got hidden columns
			$( dt.table().node() ).addClass('collapsed');

			// Show all existing child rows
			dt.rows().eq(0).each( function (idx) {
				var row = dt.row( idx );

				if ( row.child() ) {
					var info = that.c.details.renderer( dt, row[0] );

					// The renderer can return false to have no child row
					if ( info === false ) {
						row.child.hide();
					}
					else {
						row.child( info, 'child' ).show();
					}
				}
			} );
		}
		else {
			// No hidden columns
			$( dt.table().node() ).removeClass('collapsed');

			// Hide all existing child rows
			dt.rows().eq(0).each( function (idx) {
				dt.row( idx ).child.hide();
			} );
		}
	},


	/**
	 * Find a breakpoint object from a name
	 * @param  {string} name Breakpoint name to find
	 * @return {object}      Breakpoint description object
	 */
	_find: function ( name )
	{
		var breakpoints = this.c.breakpoints;

		for ( var i=0, ien=breakpoints.length ; i<ien ; i++ ) {
			if ( breakpoints[i].name === name ) {
				return breakpoints[i];
			}
		}
	},


	/**
	 * Alter the table display for a resized viewport. This involves first
	 * determining what breakpoint the window currently is in, getting the
	 * column visibilities to apply and then setting them.
	 *
	 * @private
	 */
	_resize: function ()
	{
		var dt = this.s.dt;
		var width = $(window).width();
		var breakpoints = this.c.breakpoints;
		var breakpoint = breakpoints[0].name;

		// Determine what breakpoint we are currently at
		for ( var i=breakpoints.length-1 ; i>=0 ; i-- ) {
			if ( width <= breakpoints[i].width ) {
				breakpoint = breakpoints[i].name;
				break;
			}
		}
		
		// Show the columns for that break point
		var columns = this._columnsVisiblity( breakpoint );

		dt.columns().eq(0).each( function ( colIdx, i ) {
			dt.column( colIdx ).visible( columns[i] );
		} );
	},


	/**
	 * Determine the width of each column in the table so the auto column hiding
	 * has that information to work with. This method is never going to be 100%
	 * perfect since column widths can change slightly per page, but without
	 * seriously compromising performance this is quite effective.
	 *
	 * @private
	 */
	_resizeAuto: function ()
	{
		var dt = this.s.dt;
		var columns = this.s.columns;

		// Are we allowed to do auto sizing?
		if ( ! this.c.auto ) {
			return;
		}

		// Are there any columns that actually need auto-sizing, or do they all
		// have classes defined
		if ( $.inArray( true, $.map( columns, function (c) { return c.auto; } ) ) === -1 ) {
			return;
		}

		// Clone the table with the current data in it
		var tableWidth   = dt.table().node().offsetWidth;
		var columnWidths = dt.columns;
		var clonedTable  = dt.table().node().cloneNode( false );
		var clonedHeader = $( dt.table().header().cloneNode( false ) ).appendTo( clonedTable );
		var clonedBody   = $( dt.table().body().cloneNode( false ) ).appendTo( clonedTable );

		// This is a bit slow, but we need to get a clone of each row that
		// includes all columns. As such, try to do this as little as possible.
		dt.rows( { page: 'current' } ).indexes().each( function ( idx ) {
			var clone = dt.row( idx ).node().cloneNode( true );
			
			if ( dt.columns( ':hidden' ).flatten().length ) {
				$(clone).append( dt.cells( idx, ':hidden' ).nodes().to$().clone() );
			}

			$(clone).appendTo( clonedBody );
		} );

		var cells        = dt.columns().header().to$().clone( false ).wrapAll('tr').appendTo( clonedHeader );
		var inserted     = $('<div/>')
			.css( {
				width: 1,
				height: 1,
				overflow: 'hidden'
			} )
			.append( clonedTable )
			.insertBefore( dt.table().node() );

		// The cloned header now contains the smallest that each column can be
		dt.columns().eq(0).each( function ( idx ) {
			columns[idx].minWidth = cells[ idx ].offsetWidth || 0;
		} );

		inserted.remove();
	}
};


/**
 * List of default breakpoints. Each item in the array is an object with two
 * properties:
 *
 * * `name` - the breakpoint name.
 * * `width` - the breakpoint width
 *
 * @name Responsive.breakpoints
 * @static
 */
Responsive.breakpoints = [
	{ name: 'desktop',  width: Infinity },
	{ name: 'tablet-l', width: 1024 },
	{ name: 'tablet-p', width: 768 },
	{ name: 'mobile-l', width: 480 },
	{ name: 'mobile-p', width: 320 }
];


/**
 * Responsive default settings for initialisation
 *
 * @namespace
 * @name Responsive.defaults
 * @static
 */
Responsive.defaults = {
	/**
	 * List of breakpoints for the instance. Note that this means that each
	 * instance can have its own breakpoints. Additionally, the breakpoints
	 * cannot be changed once an instance has been creased.
	 *
	 * @type {Array}
	 * @default Takes the value of `Responsive.breakpoints`
	 */
	breakpoints: Responsive.breakpoints,

	/**
	 * Enable / disable auto hiding calculations. It can help to increase
	 * performance slightly if you disable this option, but all columns would
	 * need to have breakpoint classes assigned to them
	 *
	 * @type {Boolean}
	 * @default  `true`
	 */
	auto: true,

	/**
	 * Details control. If given as a string value, the `type` property of the
	 * default object is set to that value, and the defaults used for the rest
	 * of the object - this is for ease of implementation.
	 *
	 * The object consists of the following properties:
	 *
	 * * `renderer` - function that is called for display of the child row data.
	 *   The default function will show the data from the hidden columns
	 * * `target` - Used as the selector for what objects to attach the child
	 *   open / close to
	 * * `type` - `false` to disable the details display, `inline` or `column`
	 *   for the two control types
	 *
	 * @type {Object|string}
	 */
	details: {
		renderer: function ( api, rowIdx ) {
			var data = api.cells( rowIdx, ':hidden' ).eq(0).map( function ( cell ) {
				var header = $( api.column( cell.column ).header() );

				if ( header.hasClass( 'control' ) ) {
					return '';
				}

				return '<li>'+
						'<span class="dtr-title">'+
							header.text()+':'+
						'</span> '+
						'<span class="dtr-data">'+
							api.cell( cell ).data()+
						'</span>'+
					'</li>';
			} ).toArray().join('');

			return data ?
				$('<ul/>').append( data ) :
				false;
		},

		target: 0,

		type: 'inline'
	}
};


/*
 * API
 */
var Api = $.fn.dataTable.Api;

// Doesn't do anything - work around for a bug in DT... Not documented
Api.register( 'responsive()', function () {
	return this;
} );

Api.register( 'responsive.recalc()', function ( rowIdx, intParse, virtual ) {
	this.iterator( 'table', function ( ctx ) {
		if ( ctx._responsive ) {
			ctx._responsive._resizeAuto();
			ctx._responsive._resize();
		}
	} );
} );


/**
 * Version information
 *
 * @name Responsive.version
 * @static
 */
Responsive.version = '1.0.1';


$.fn.dataTable.Responsive = Responsive;
$.fn.DataTable.Responsive = Responsive;

// Attach a listener to the document which listens for DataTables initialisation
// events so we can automatically initialise
$(document).on( 'init.dt.dtr', function (e, settings, json) {
	if ( $(settings.nTable).hasClass( 'responsive' ) ||
		 $(settings.nTable).hasClass( 'dt-responsive' ) ||
		 settings.oInit.responsive
	) {
		var init = settings.oInit.responsive;

		if ( init !== false ) {
			new Responsive( settings, $.isPlainObject( init ) ? init : {}  );
		}
	}
} );

return Responsive;
}; // /factory


// Define as an AMD module if possible
if ( typeof define === 'function' && define.amd ) {
	define( ['jquery', 'datatables'], factory );
}
else if ( typeof exports === 'object' ) {
    // Node/CommonJS
    factory( require('jquery'), require('datatables') );
}
else if ( jQuery && !jQuery.fn.dataTable.Responsive ) {
	// Otherwise simply initialise as normal, stopping multiple evaluation
	factory( jQuery, jQuery.fn.dataTable );
}


})(window, document);

