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

    var _buildParams = function (dt, action, onlyVisibles) {
        var params = dt.ajax.params();
        params.action = action;
        params._token = $('meta[name="csrf-token"]').attr('content');

        if (onlyVisibles) {
            params.visible_columns = _getVisibleColumns();
        } else {
            params.visible_columns = null;
        }

        return params;
    };

    var _getVisibleColumns = function () {

        var visible_columns = [];
        $.each(DataTable.settings[0].aoColumns, function (key, col) {
            if (col.bVisible) {
                visible_columns.push(col.name);
            }
        });

        return visible_columns;
    };

    var _downloadFromUrl = function (url, params) {
        var postUrl = url + '/export';
        var xhr = new XMLHttpRequest();
        xhr.open('POST', postUrl, true);
        xhr.responseType = 'arraybuffer';
        xhr.onload = function () {
            if (this.status === 200) {
                var filename = "";
                var disposition = xhr.getResponseHeader('Content-Disposition');
                if (disposition && disposition.indexOf('attachment') !== -1) {
                    var filenameRegex = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/;
                    var matches = filenameRegex.exec(disposition);
                    if (matches != null && matches[1]) filename = matches[1].replace(/['"]/g, '');
                }
                var type = xhr.getResponseHeader('Content-Type');

                var blob = new Blob([this.response], {type: type});
                if (typeof window.navigator.msSaveBlob !== 'undefined') {
                    // IE workaround for "HTML7007: One or more blob URLs were revoked by closing the blob for which they were created. These URLs will no longer resolve as the data backing the URL has been freed."
                    window.navigator.msSaveBlob(blob, filename);
                } else {
                    var URL = window.URL || window.webkitURL;
                    var downloadUrl = URL.createObjectURL(blob);

                    if (filename) {
                        // use HTML5 a[download] attribute to specify filename
                        var a = document.createElement("a");
                        // safari doesn't support this yet
                        if (typeof a.download === 'undefined') {
                            window.location = downloadUrl;
                        } else {
                            a.href = downloadUrl;
                            a.download = filename;
                            document.body.appendChild(a);
                            a.click();
                        }
                    } else {
                        window.location = downloadUrl;
                    }

                    setTimeout(function () {
                        URL.revokeObjectURL(downloadUrl);
                    }, 100); // cleanup
                }
            }
        };
        xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
        xhr.send($.param(params));
    };

    var _buildUrl = function(dt, action) {
        var url = dt.ajax.url() || '';
        var params = dt.ajax.params();
        params.action = action;

        if (url.indexOf('?') > -1) {
            return url + '&' + $.param(params);
        }

        return url + '?' + $.param(params);
    };

    DataTable.ext.buttons.excel = {
        className: 'buttons-excel',

        text: function (dt) {
            return '<i class="fa fa-file-excel-o"></i> ';
        },
        titleAttr: function (dt) {
            return  dt.i18n('buttons.excel', 'Excel');
        },

        action: function (e, dt, button, config) {
            var url = _buildUrl(dt, 'excel');
            window.location = url;
        }
    };

    DataTable.ext.buttons.postExcel = {
        className: 'buttons-excel',

        text: function (dt) {
            return '<i class="fa fa-file-excel-o"></i> ' ;
        },
        titleAttr: function (dt) {
            return dt.i18n('buttons.excel', 'Excel');
        },

        action: function (e, dt, button, config) {
            var url = dt.ajax.url() || window.location.href;
            var params = _buildParams(dt, 'excel');

            _downloadFromUrl(url, params);
        }
    };

    DataTable.ext.buttons.postExcelVisibleColumns = {
        className: 'buttons-excel',

        text: function (dt) {
            return '<i class="fa fa-file-excel-o"></i> ' ;
        },
        titleAttr: function (dt) {
            return dt.i18n('buttons.excel', 'Excel (only visible columns)');
        },

        action: function (e, dt, button, config) {
            var url = dt.ajax.url() || window.location.href;
            var params = _buildParams(dt, 'excel', true);

            _downloadFromUrl(url, params);
        }
    };

    DataTable.ext.buttons.export = {
        extend: 'collection',

        className: 'buttons-export',

        text: function (dt) {
            return '<i class="fa fa-download"></i> ' ;
        },
        titleAttr: function (dt) {
            return dt.i18n('buttons.export', 'Export') + '&nbsp;<span class="caret"/>';
        },

        buttons: ['csv', 'excel', 'pdf']
    };

    DataTable.ext.buttons.csv = {
        className: 'buttons-csv',

        text: function (dt) {
            return '<i class="fa fa-file-excel-o"></i> ';
        },

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

        action: function (e, dt, button, config) {
            var url = _buildUrl(dt, 'csv');
            window.location = url;
        }
    };

    DataTable.ext.buttons.postCsvVisibleColumns = {
        className: 'buttons-csv',

        text: function (dt) {
            return '<i class="fa fa-file-excel-o"></i> ';
        },
        titleAttr: function (dt) {
            return dt.i18n('buttons.csv', 'CSV (only visible columns)');
        },

        action: function (e, dt, button, config) {
            var url = dt.ajax.url() || window.location.href;
            var params = _buildParams(dt, 'csv', true);

            _downloadFromUrl(url, params);
        }
    };

    DataTable.ext.buttons.postCsv = {
        className: 'buttons-csv',

        text: function (dt) {
            return '<i class="fa fa-file-excel-o"></i> ';
        },

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

        action: function (e, dt, button, config) {
            var url = dt.ajax.url() || window.location.href;
            var params = _buildParams(dt, 'csv');

            _downloadFromUrl(url, params);
        }
    };

    DataTable.ext.buttons.pdf = {
        className: 'buttons-pdf',

        text: function (dt) {
            return '<i class="fa fa-file-pdf-o"></i> ';
        },

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

        action: function (e, dt, button, config) {
            var url = _buildUrl(dt, 'pdf');
            window.location = url;
        }
    };

    DataTable.ext.buttons.postPdf = {
        className: 'buttons-pdf',

        text: function (dt) {
            return '<i class="fa fa-file-pdf-o"></i> ';
        },
        titleAttr: function (dt) {
            return  dt.i18n('buttons.pdf', 'PDF');
        },

        action: function (e, dt, button, config) {
            var url = dt.ajax.url() || window.location.href;
            var params = _buildParams(dt, 'pdf');

            _downloadFromUrl(url, params);
        }
    };

    DataTable.ext.buttons.print = {
        className: 'buttons-print',

        text: function (dt) {
            return  '<i class="fa fa-print"></i> ';
        },
        titleAttr: function (dt) {
            return   dt.i18n('buttons.print', 'Print');
        },

        action: function (e, dt, button, config) {
            var url = _buildUrl(dt, 'print');
            window.location = url;
        }
    };

    DataTable.ext.buttons.reset = {
        className: 'buttons-reset',

        text: function (dt) {
            return '<i class="fa fa-undo"></i> ' ;
        },
        titleAttr: function (dt) {
            return  dt.i18n('buttons.reset', 'Reset');
        },

        action: function (e, dt, button, config) {
            dt.search('');
            dt.columns().search('');
            dt.draw();
        }
    };

    DataTable.ext.buttons.reload = {
        className: 'buttons-reload',

        text: function (dt) {
            return '<i class="fa fa-refresh"></i> ';
        },
        titleAttr: function (dt) {
            return  dt.i18n('buttons.reload', 'Reload');
        },

        action: function (e, dt, button, config) {
            dt.draw(false);
        }
    };

    DataTable.ext.buttons.create = {
        className: 'buttons-create',

        text: function (dt) {
            return '<i class="fa fa-plus"></i> ';
        },
        titleAttr: function (dt) {
            return + dt.i18n('buttons.create', 'Create');
        },

        action: function (e, dt, button, config) {
            window.location = window.location.href.replace(/\/+$/, "") + '/create';
        }
    };

    if (typeof DataTable.ext.buttons.copyHtml5 !== 'undefined') {
        $.extend(DataTable.ext.buttons.copyHtml5, {
            text: function (dt) {
                return '<i class="fa fa-copy"></i> ';
            },
            titleAttr: function (dt) {
                return  dt.i18n('buttons.copy', 'Copy');
            }
        });
    }

    if (typeof DataTable.ext.buttons.colvis !== 'undefined') {
        $.extend(DataTable.ext.buttons.colvis, {
            text: function (dt) {
                return '<i class="fa fa-eye"></i> ' ;
            },
            titleAttr: function (dt) {
                return  dt.i18n('buttons.colvis', 'Column visibility');
            }
        });
    }
})(jQuery, jQuery.fn.dataTable);
