/*!
 * HTML5 export buttons for Buttons and DataTables.
 * 2015 SpryMedia Ltd - datatables.net/license
 *
 * FileSaver.js (2015-05-07.2) - MIT license
 * Copyright © 2015 Eli Grey - http://eligrey.com
 */

(function($, DataTable) {
"use strict";


/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * FileSaver.js dependency
 */

/*jslint bitwise: true, indent: 4, laxbreak: true, laxcomma: true, smarttabs: true, plusplus: true */

var _saveAs = (function(view) {
	// IE <10 is explicitly unsupported
	if (typeof navigator !== "undefined" && /MSIE [1-9]\./.test(navigator.userAgent)) {
		return;
	}
	var
		  doc = view.document
		  // only get URL when necessary in case Blob.js hasn't overridden it yet
		, get_URL = function() {
			return view.URL || view.webkitURL || view;
		}
		, save_link = doc.createElementNS("http://www.w3.org/1999/xhtml", "a")
		, can_use_save_link = "download" in save_link
		, click = function(node) {
			var event = doc.createEvent("MouseEvents");
			event.initMouseEvent(
				"click", true, false, view, 0, 0, 0, 0, 0
				, false, false, false, false, 0, null
			);
			node.dispatchEvent(event);
		}
		, webkit_req_fs = view.webkitRequestFileSystem
		, req_fs = view.requestFileSystem || webkit_req_fs || view.mozRequestFileSystem
		, throw_outside = function(ex) {
			(view.setImmediate || view.setTimeout)(function() {
				throw ex;
			}, 0);
		}
		, force_saveable_type = "application/octet-stream"
		, fs_min_size = 0
		// See https://code.google.com/p/chromium/issues/detail?id=375297#c7 and
		// https://github.com/eligrey/FileSaver.js/commit/485930a#commitcomment-8768047
		// for the reasoning behind the timeout and revocation flow
		, arbitrary_revoke_timeout = 500 // in ms
		, revoke = function(file) {
			var revoker = function() {
				if (typeof file === "string") { // file is an object URL
					get_URL().revokeObjectURL(file);
				} else { // file is a File
					file.remove();
				}
			};
			if (view.chrome) {
				revoker();
			} else {
				setTimeout(revoker, arbitrary_revoke_timeout);
			}
		}
		, dispatch = function(filesaver, event_types, event) {
			event_types = [].concat(event_types);
			var i = event_types.length;
			while (i--) {
				var listener = filesaver["on" + event_types[i]];
				if (typeof listener === "function") {
					try {
						listener.call(filesaver, event || filesaver);
					} catch (ex) {
						throw_outside(ex);
					}
				}
			}
		}
		, auto_bom = function(blob) {
			// prepend BOM for UTF-8 XML and text/* types (including HTML)
			if (/^\s*(?:text\/\S*|application\/xml|\S*\/\S*\+xml)\s*;.*charset\s*=\s*utf-8/i.test(blob.type)) {
				return new Blob(["\ufeff", blob], {type: blob.type});
			}
			return blob;
		}
		, FileSaver = function(blob, name) {
			blob = auto_bom(blob);
			// First try a.download, then web filesystem, then object URLs
			var
				  filesaver = this
				, type = blob.type
				, blob_changed = false
				, object_url
				, target_view
				, dispatch_all = function() {
					dispatch(filesaver, "writestart progress write writeend".split(" "));
				}
				// on any filesys errors revert to saving with object URLs
				, fs_error = function() {
					// don't create more object URLs than needed
					if (blob_changed || !object_url) {
						object_url = get_URL().createObjectURL(blob);
					}
					if (target_view) {
						target_view.location.href = object_url;
					} else {
						var new_tab = view.open(object_url, "_blank");
						if (new_tab === undefined && typeof safari !== "undefined") {
							//Apple do not allow window.open, see http://bit.ly/1kZffRI
							view.location.href = object_url;
						}
					}
					filesaver.readyState = filesaver.DONE;
					dispatch_all();
					revoke(object_url);
				}
				, abortable = function(func) {
					return function() {
						if (filesaver.readyState !== filesaver.DONE) {
							return func.apply(this, arguments);
						}
					};
				}
				, create_if_not_found = {create: true, exclusive: false}
				, slice
			;
			filesaver.readyState = filesaver.INIT;
			if (!name) {
				name = "download";
			}
			if (can_use_save_link) {
				object_url = get_URL().createObjectURL(blob);
				save_link.href = object_url;
				save_link.download = name;
				click(save_link);
				filesaver.readyState = filesaver.DONE;
				dispatch_all();
				revoke(object_url);
				return;
			}
			// Object and web filesystem URLs have a problem saving in Google Chrome when
			// viewed in a tab, so I force save with application/octet-stream
			// http://code.google.com/p/chromium/issues/detail?id=91158
			// Update: Google errantly closed 91158, I submitted it again:
			// https://code.google.com/p/chromium/issues/detail?id=389642
			if (view.chrome && type && type !== force_saveable_type) {
				slice = blob.slice || blob.webkitSlice;
				blob = slice.call(blob, 0, blob.size, force_saveable_type);
				blob_changed = true;
			}
			// Since I can't be sure that the guessed media type will trigger a download
			// in WebKit, I append .download to the filename.
			// https://bugs.webkit.org/show_bug.cgi?id=65440
			if (webkit_req_fs && name !== "download") {
				name += ".download";
			}
			if (type === force_saveable_type || webkit_req_fs) {
				target_view = view;
			}
			if (!req_fs) {
				fs_error();
				return;
			}
			fs_min_size += blob.size;
			req_fs(view.TEMPORARY, fs_min_size, abortable(function(fs) {
				fs.root.getDirectory("saved", create_if_not_found, abortable(function(dir) {
					var save = function() {
						dir.getFile(name, create_if_not_found, abortable(function(file) {
							file.createWriter(abortable(function(writer) {
								writer.onwriteend = function(event) {
									target_view.location.href = file.toURL();
									filesaver.readyState = filesaver.DONE;
									dispatch(filesaver, "writeend", event);
									revoke(file);
								};
								writer.onerror = function() {
									var error = writer.error;
									if (error.code !== error.ABORT_ERR) {
										fs_error();
									}
								};
								"writestart progress write abort".split(" ").forEach(function(event) {
									writer["on" + event] = filesaver["on" + event];
								});
								writer.write(blob);
								filesaver.abort = function() {
									writer.abort();
									filesaver.readyState = filesaver.DONE;
								};
								filesaver.readyState = filesaver.WRITING;
							}), fs_error);
						}), fs_error);
					};
					dir.getFile(name, {create: false}, abortable(function(file) {
						// delete file if it already exists
						file.remove();
						save();
					}), abortable(function(ex) {
						if (ex.code === ex.NOT_FOUND_ERR) {
							save();
						} else {
							fs_error();
						}
					}));
				}), fs_error);
			}), fs_error);
		}
		, FS_proto = FileSaver.prototype
		, saveAs = function(blob, name) {
			return new FileSaver(blob, name);
		}
	;
	// IE 10+ (native saveAs)
	if (typeof navigator !== "undefined" && navigator.msSaveOrOpenBlob) {
		return function(blob, name) {
			return navigator.msSaveOrOpenBlob(auto_bom(blob), name);
		};
	}

	FS_proto.abort = function() {
		var filesaver = this;
		filesaver.readyState = filesaver.DONE;
		dispatch(filesaver, "abort");
	};
	FS_proto.readyState = FS_proto.INIT = 0;
	FS_proto.WRITING = 1;
	FS_proto.DONE = 2;

	FS_proto.error =
	FS_proto.onwritestart =
	FS_proto.onprogress =
	FS_proto.onwrite =
	FS_proto.onabort =
	FS_proto.onerror =
	FS_proto.onwriteend =
		null;

	return saveAs;
}(window));



/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Local (private) functions
 */

/**
 * Get the title / file name for an exported file.
 *
 * @param {object}  config       Button configuration
 * @param {boolean} incExtension Include the file name extension
 */
var _filename = function ( config, incExtension )
{
	var title = config.title;

	if ( title.indexOf( '*' ) !== -1 ) {
		title = title.replace( '*', $('title').text() );
	}

	// Strip characters which the OS will object to
	title = title.replace(/[^a-zA-Z0-9_\u00A1-\uFFFF\.,\-_ !\(\)]/g, "");

	return incExtension === undefined || incExtension === true ?
		title+config.extension :
		title;
};

/**
 * Get the newline character(s)
 *
 * @param {object}  config Button configuration
 * @return {string}        Newline character
 */
var _newLine = function ( config )
{
	return config.newline ?
		config.newline :
		navigator.userAgent.match(/Windows/) ?
			'\r\n' :
			'\n';
};

/**
 * Combine the data from the `buttons.exportData` method into a string that
 * will be used in the export file.
 *
 * @param  {DataTable.Api} dt     DataTables API instance
 * @param  {object}        config Button configuration
 * @return {object}               The data to export
 */
var _exportData = function ( dt, config )
{
	var newLine = _newLine( config );
	var data = dt.buttons.exportData( config.exportOptions );
	var join = function ( a ) {
		var s = '';
		var boundary = config.fieldBoundary;
		var separator = config.fieldSeparator;

		// If there is a field boundary, then we might need to escape it in
		// the source data
		for ( var i=0, ien=a.length ; i<ien ; i++ ) {
			if ( i > 0 ) {
				s += separator;
			}

			s += boundary ?
				boundary + a[i].toString().replace( boundary, '\\'+boundary ) + boundary :
				a[i];
		}

		return s;
	};

	var header = config.header ? join( data.header )+newLine : '';
	var footer = config.footer ? newLine+join( data.footer ) : '';
	var body = [];

	for ( var i=0, ien=data.body.length ; i<ien ; i++ ) {
		body.push( join( data.body[i] ) );
	}

	return {
		str: header + body.join( newLine ) + footer,
		rows: body.length
	};
};

/**
 * Safari's data: support for creating and downloading files is really poor, so
 * various options need to be disabled in it. See
 * https://bugs.webkit.org/show_bug.cgi?id=102914
 * 
 * @return {Boolean} `true` if Safari
 */
var _isSafari = function ()
{
	return navigator.userAgent.indexOf('Safari') !== -1 &&
		navigator.userAgent.indexOf('Chrome') === -1 &&
		navigator.userAgent.indexOf('Opera') === -1;
};


// Excel - Pre-defined strings to build a minimal XLSX file
var excelStrings = {
	"_rels/.rels": '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>\
<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">\
	<Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument" Target="xl/workbook.xml"/>\
</Relationships>',

	"xl/_rels/workbook.xml.rels": '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>\
<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">\
	<Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet" Target="worksheets/sheet1.xml"/>\
</Relationships>',

	"[Content_Types].xml": '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>\
<Types xmlns="http://schemas.openxmlformats.org/package/2006/content-types">\
	<Default Extension="xml" ContentType="application/xml"/>\
	<Default Extension="rels" ContentType="application/vnd.openxmlformats-package.relationships+xml"/>\
	<Default Extension="jpeg" ContentType="image/jpeg"/>\
	<Override PartName="/xl/workbook.xml" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml"/>\
	<Override PartName="/xl/worksheets/sheet1.xml" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml"/>\
</Types>',

	"xl/workbook.xml": '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>\
<workbook xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships">\
	<fileVersion appName="xl" lastEdited="5" lowestEdited="5" rupBuild="24816"/>\
	<workbookPr showInkAnnotation="0" autoCompressPictures="0"/>\
	<bookViews>\
		<workbookView xWindow="0" yWindow="0" windowWidth="25600" windowHeight="19020" tabRatio="500"/>\
	</bookViews>\
	<sheets>\
		<sheet name="Sheet1" sheetId="1" r:id="rId1"/>\
	</sheets>\
</workbook>',

	"xl/worksheets/sheet1.xml": '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>\
<worksheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="x14ac" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac">\
	<sheetData>\
		__DATA__\
	</sheetData>\
</worksheet>'
};



/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Buttons
 */

//
// Copy to clipboard
//
DataTable.ext.buttons.copyHtml5 = {
	className: 'buttons-copy buttons-html5',

	text: function ( dt ) {
		return dt.i18n( 'buttons.copy', 'Copy' );
	},

	action: function ( e, dt, button, config ) {
		// This button is slightly sneaky as there is no HTML API to copy text
		// to a clipboard, so what it does is use the buttons information
		// element with an also completely hidden textarea that contains the
		// data to be copied. That is pre-selected so the user just needs to
		// activate their system clipboard.
		var newLine = _newLine( config );
		var output = _exportData( dt, config ).str;
		var message = $('<span>'+dt.i18n( 'buttons.copyKeys',
				'Press <i>ctrl</i> or <i>\u2318</i> + <i>C</i> to copy the table data<br>to your system clipboard.<br><br>'+
				'To cancel, click this message or press escape.' )+'</span>'
			)
			.append( $('<div/>')
				.css( {
					height: 1,
					width: 1,
					overflow: 'hidden'
				} )
				.append(
					$('<textarea readonly/>').val( output )
				)
		);

		dt.buttons.info( dt.i18n( 'buttons.copyTitle', 'Copy to clipboard' ), message, 0 );

		// Select the text so when the user activates their system clipboard
		// it will copy that text
		message.find('textarea')[0].focus();
		message.find('textarea')[0].select();

		// Event to hide the message when the user is done
		var container = $(message).closest('.dt-button-info');
		var close = function () {
			container.off( 'click.buttons-copy' );
			$(document).off( '.buttons-copy' );
			dt.buttons.info( false );
		};

		container.on( 'click.buttons-copy', close );
		$(document)
			.on( 'keydown.buttons-copy', function (e) {
				if ( e.keyCode === 27 ) { // esc
					close();
				}
			} )
			.on( 'copy.buttons-copy cut.buttons-copy', function () {
				close();
			} );
	},

	exportOptions: {},

	fieldSeparator: '\t',

	fieldBoundary: '',

	header: true,

	footer: false
};

//
// CSV export
//
DataTable.ext.buttons.csvHtml5 = {
	className: 'buttons-csv buttons-html5',

	available: function () {
		return window.FileReader !== undefined && window.Blob;
	},

	text: function ( dt ) {
		return dt.i18n( 'buttons.csv', 'CSV' );
	},

	action: function ( e, dt, button, config ) {
		// Set the text
		var newLine = _newLine( config );
		var output = _exportData( dt, config ).str;

		_saveAs(
			new Blob( [output], {type : 'text/csv'} ),
			_filename( config )
		);
	},

	title: '*',

	extension: '.csv',

	exportOptions: {},

	fieldSeparator: ',',

	fieldBoundary: '"',

	header: true,

	footer: false
};

//
// Excel (xlsx) export
//
DataTable.ext.buttons.excelHtml5 = {
	className: 'buttons-excel buttons-html5',

	available: function () {
		return window.FileReader !== undefined && window.JSZip !== undefined && ! _isSafari();
	},

	text: function ( dt ) {
		return dt.i18n( 'buttons.excel', 'Excel' );
	},

	action: function ( e, dt, button, config ) {
		// Set the text
		var xml = '';
		var data = dt.buttons.exportData( config.exportOptions );
		var addRow = function ( row ) {
			var cells = [];

			for ( var i=0, ien=row.length ; i<ien ; i++ ) {
				cells.push( $.isNumeric( row[i] ) ?
					'<c t="n"><v>'+row[i]+'</v></c>' :
					'<c t="inlineStr"><is><t>'+
						row[i].replace(/&(?!amp;)/g, '&amp;')+
					'</t></is></c>'
				);
			}

			return '<row>'+cells.join('')+'</row>';
		};

		if ( config.header ) {
			xml += addRow( data.header );
		}

		for ( var i=0, ien=data.body.length ; i<ien ; i++ ) {
			xml += addRow( data.body[i] );
		}

		if ( config.footer ) {
			xml += addRow( data.footer );
		}

		var zip           = new window.JSZip();
		var _rels         = zip.folder("_rels");
		var xl            = zip.folder("xl");
		var xl_rels       = zip.folder("xl/_rels");
		var xl_worksheets = zip.folder("xl/worksheets");

		zip.file(           '[Content_Types].xml', excelStrings['[Content_Types].xml'] );
		_rels.file(         '.rels',               excelStrings['_rels/.rels'] );
		xl.file(            'workbook.xml',        excelStrings['xl/workbook.xml'] );
		xl_rels.file(       'workbook.xml.rels',   excelStrings['xl/_rels/workbook.xml.rels'] );
		xl_worksheets.file( 'sheet1.xml',          excelStrings['xl/worksheets/sheet1.xml'].replace( '__DATA__', xml ) );

		_saveAs(
			zip.generate( {type:"blob"} ),
			_filename( config )
		);
	},

	title: '*',

	extension: '.xlsx',

	exportOptions: {},

	header: true,

	footer: false
};

//
// PDF export - using pdfMake - http://pdfmake.org
//
DataTable.ext.buttons.pdfHtml5 = {
	className: 'buttons-pdf buttons-html5',

	available: function () {
		return window.FileReader !== undefined && window.pdfMake;
	},

	text: function ( dt ) {
		return dt.i18n( 'buttons.pdf', 'PDF' );
	},

	action: function ( e, dt, button, config ) {
		var newLine = _newLine( config );
		var data = dt.buttons.exportData( config.exportOptions );
		var rows = [];

		if ( config.header ) {
			rows.push( $.map( data.header, function ( d ) {
				return {
					text: d,
					style: 'tableHeader'
				};
			} ) );
		}

		for ( var i=0, ien=data.body.length ; i<ien ; i++ ) {
			rows.push( $.map( data.body[i], function ( d ) {
				return {
					text: d,
					style: i % 2 ? 'tableBodyEven' : 'tableBodyOdd'
				};
			} ) );
		}

		if ( config.footer ) {
			rows.push( $.map( data.footer, function ( d ) {
				return {
					text: d,
					style: 'tableFooter'
				};
			} ) );
		}

		var doc = {
			pageSize: config.pageSize,
			pageOrientation: config.orientation,
			content: [
				{
					table: {
						headerRows: 1,
						body: rows
					},
					layout: 'noBorders'
				}
			],
			styles: {
				tableHeader: {
					bold: true,
					fontSize: 11,
					color: 'white',
					fillColor: '#2d4154',
					alignment: 'center'
				},
				tableBodyEven: {},
				tableBodyOdd: {
					fillColor: '#f3f3f3'
				},
				tableFooter: {
					bold: true,
					fontSize: 11,
					color: 'white',
					fillColor: '#2d4154'
				},
				title: {
					alignment: 'center',
					fontSize: 15
				},
				message: {}
			},
			defaultStyle: {
				fontSize: 10
			}
		};

		if ( config.message ) {
			doc.content.unshift( {
				text: config.message,
				style: 'message',
				margin: [ 0, 0, 0, 12 ]
			} );
		}

		if ( config.title ) {
			doc.content.unshift( {
				text: _filename( config, false ),
				style: 'title',
				margin: [ 0, 0, 0, 12 ]
			} );
		}

		if ( config.customize ) {
			config.customize( doc );
		}

		var pdf = window.pdfMake.createPdf( doc );

		if ( config.download === 'open' && ! _isSafari() ) {
			pdf.open();
		}
		else {
			pdf.getBuffer( function (buffer) {
				var blob = new Blob( [buffer], {type:'application/pdf'} );

				_saveAs( blob, _filename( config ) );
			} );
		}
	},

	title: '*',

	extension: '.pdf',

	exportOptions: {},

	orientation: 'portrait',

	pageSize: 'A4',

	header: true,

	footer: false,

	message: null,

	customize: null,

	download: 'download'
};


})(jQuery, jQuery.fn.dataTable);
