(function ($) {

    $.fn.tableHeadFixer = function (param) {

        return this.each(function () {
            table.call(this);
        });

        function table() {
            /*
             This function solver z-index problem in corner cell where fix row and column at the same time,
             set corner cells z-index 1 more then other fixed cells
             */
            function setCorner() {
                var table = $(settings.table);

                if (settings.head) {
                    if (settings.left > 0) {
                        var tr = table.find("> thead > tr");

                        tr.each(function (k, row) {
                            solverLeftColspan(row, function (cell) {
                                $(cell).css("z-index", settings['z-index'] + 1);
                            });
                        });
                    }

                    if (settings.right > 0) {
                        var tr = table.find("> thead > tr");

                        tr.each(function (k, row) {
                            solveRightColspan(row, function (cell) {
                                $(cell).css("z-index", settings['z-index'] + 1);
                            });
                        });
                    }
                }

                if (settings.foot) {
                    if (settings.left > 0) {
                        var tr = table.find("> tfoot > tr");

                        tr.each(function (k, row) {
                            solverLeftColspan(row, function (cell) {
                                $(cell).css("z-index", settings['z-index']);
                            });
                        });
                    }

                    if (settings.right > 0) {
                        var tr = table.find("> tfoot > tr");

                        tr.each(function (k, row) {
                            solveRightColspan(row, function (cell) {
                                $(cell).css("z-index", settings['z-index']);
                            });
                        });
                    }
                }
            }

            // Set style of table parent
            function setParent() {
                var parent = $(settings.parent);
                var table = $(settings.table);

                parent.append(table);
                parent
                    .css({
                        'overflow-x': 'auto',
                        'overflow-y': 'auto'
                    });

                parent.scroll(function () {
                    var scrollWidth = parent[0].scrollWidth;
                    var clientWidth = parent[0].clientWidth;
                    var scrollHeight = parent[0].scrollHeight;
                    var clientHeight = parent[0].clientHeight;
                    var top = parent.scrollTop();
                    var left = parent.scrollLeft();

                    if (settings.head)
                        this.find("> thead > tr > *").css("top", top);

                    if (settings.foot)
                        this.find("> tfoot > tr > *").css("bottom", scrollHeight - clientHeight - top);

                    if (settings.left > 0)
                        settings.leftColumns.css("left", left);

                    if (settings.right > 0)
                        settings.rightColumns.css("right", scrollWidth - clientWidth - left);
                }.bind(table));
            }

            // Set table head fixed
            function fixHead() {
                var thead = $(settings.table).find("> thead");
                var tr = thead.find("> tr");
                var cells = thead.find("> tr > *");

                setBackground(cells);
                cells.css({
                    'position': 'relative'
                });
            }

            // Set table foot fixed
            function fixFoot() {
                var tfoot = $(settings.table).find("> tfoot");
                var tr = tfoot.find("> tr");
                var cells = tfoot.find("> tr > *");

                setBackground(cells);
                cells.css({
                    'position': 'relative'
                });
            }

            // Set table left column fixed
            function fixLeft() {
                var table = $(settings.table);

                // var fixColumn = settings.left;

                settings.leftColumns = $();

                var tr = table.find("> thead > tr, > tbody > tr, > tfoot > tr");
                tr.each(function (k, row) {

                    solverLeftColspan(row, function (cell) {
                        settings.leftColumns = settings.leftColumns.add(cell);
                    });
                    // var inc = 1;

                    // for(var i = 1; i <= fixColumn; i = i + inc) {
                    // 	var nth = inc > 1 ? i - 1 : i;

                    // 	var cell = $(row).find("*:nth-child(" + nth + ")");
                    // 	var colspan = cell.prop("colspan");

                    // 	settings.leftColumns = settings.leftColumns.add(cell);

                    // 	inc = colspan;
                    // }
                });

                var column = settings.leftColumns;

                column.each(function (k, cell) {
                    var cell = $(cell);

                    setBackground(cell);
                    cell.css({
                        'position': 'relative'
                    });
                });
            }

            // Set table right column fixed
            function fixRight() {
                var table = $(settings.table);

                var fixColumn = settings.right;

                settings.rightColumns = $();

                var tr_head = table.find('> thead').find("> tr");
                var tr_body = table.find('> tbody').find("> tr");
                var fcell = null;
                tr_head.each(function (k, row) {
                    solveRightColspanHead(row, function (cell) {
                        if (k === 0) {
                            fcell = cell;
                        }
                        settings.rightColumns = settings.rightColumns.add(fcell);
                    });
                });

                tr_body.each(function (k, row) {
                    solveRightColspanBody(row, function (cell) {
                        settings.rightColumns = settings.rightColumns.add(cell);
                    });
                });

                var column = settings.rightColumns;

                column.each(function (k, cell) {
                    var cell = $(cell);

                    setBackground(cell);
                    cell.css({
                        'position': 'relative',
                        'z-index': '9999'
                    });
                });

            }

            // Set fixed cells backgrounds
            function setBackground(elements) {
                elements.each(function (k, element) {
                    var element = $(element);
                    var parent = $(element).parent();

                    var elementBackground = element.css("background-color");
                    elementBackground = (elementBackground == "transparent" || elementBackground == "rgba(0, 0, 0, 0)") ? null : elementBackground;

                    var parentBackground = parent.css("background-color");
                    parentBackground = (parentBackground == "transparent" || parentBackground == "rgba(0, 0, 0, 0)") ? null : parentBackground;

                    var background = parentBackground ? parentBackground : "white";
                    background = elementBackground ? elementBackground : background;

                    element.css("background-color", background);
                });
            }

            function solverLeftColspan(row, action) {
                var fixColumn = settings.left;
                var inc = 1;

                for (var i = 1; i <= fixColumn; i = i + inc) {
                    var nth = inc > 1 ? i - 1 : i;

                    var cell = $(row).find("> *:nth-child(" + nth + ")");
                    var colspan = cell.prop("colspan");

                    if (typeof cell.cellPos() != 'undefined' && cell.cellPos().left < fixColumn) {
                        action(cell);
                    }

                    inc = colspan;
                }
            }

            function solveRightColspanHead(row, action) {
                var fixColumn = settings.right;
                var inc = 1;
                for (var i = 1; i <= fixColumn; i = i + inc) {
                    var nth = inc > 1 ? i - 1 : i;

                    var cell = $(row).find("> *:nth-last-child(" + nth + ")");
                    var colspan = cell.prop("colspan");

                    action(cell);

                    inc = colspan;
                }
            }

            function solveRightColspanBody(row, action) {
                var fixColumn = settings.right;
                var inc = 1;
                for (var i = 1; i <= fixColumn; i = i + inc) {
                    var nth = inc > 1 ? i - 1 : i;

                    var cell = $(row).find("> *:nth-last-child(" + nth + ")");
                    var colspan = cell.prop("colspan");
                    action(cell);
                    inc = colspan;
                }
            }

            var defaults = {
                head: true,
                foot: false,
                left: 0,
                right: 0,
                'z-index': 0
            };

            var settings = $.extend({}, defaults, param);

            settings.table = this;
            settings.parent = $(settings.table).parent();
            setParent();

            if (settings.head == true) {
                fixHead();
            }

            if (settings.foot == true) {
                fixFoot();
            }

            if (settings.left > 0) {
                fixLeft();
            }

            if (settings.right > 0) {
                fixRight();
            }

            setCorner();

            $(settings.parent).trigger("scroll");

            $(window).resize(function () {
                $(settings.parent).trigger("scroll");
            });
        }
    };

})(jQuery);

/*  cellPos jQuery plugin
 ---------------------
 Get visual position of cell in HTML table (or its block like thead).
 Return value is object with "top" and "left" properties set to row and column index of top-left cell corner.
 Example of use:
 $("#myTable tbody td").each(function(){
 $(this).text( $(this).cellPos().top +", "+ $(this).cellPos().left );
 });
 */
(function ($) {
    /* scan individual table and set "cellPos" data in the form { left: x-coord, top: y-coord } */
    function scanTable($table) {
        var m = [];
        $table.children("tr").each(function (y, row) {
            $(row).children("td, th").each(function (x, cell) {
                var $cell = $(cell),
                    cspan = $cell.attr("colspan") | 0,
                    rspan = $cell.attr("rowspan") | 0,
                    tx, ty;
                cspan = cspan ? cspan : 1;
                rspan = rspan ? rspan : 1;
                for (; m[y] && m[y][x]; ++x);  //skip already occupied cells in current row
                for (tx = x; tx < x + cspan; ++tx) {  //mark matrix elements occupied by current cell with true
                    for (ty = y; ty < y + rspan; ++ty) {
                        if (!m[ty]) {  //fill missing rows
                            m[ty] = [];
                        }
                        m[ty][tx] = true;
                    }
                }
                var pos = {top: y, left: x};
                $cell.data("cellPos", pos);
            });
        });
    };

    /* plugin */
    $.fn.cellPos = function (rescan) {
        var $cell = this.first(),
            pos = $cell.data("cellPos");
        if (!pos || rescan) {
            var $table = $cell.closest("table, thead, tbody, tfoot");
            scanTable($table);
        }
        pos = $cell.data("cellPos");
        return pos;
    }
})(jQuery);
