/**
 *
 * @name:  子表格扩展
 * @author: yelog
 * @version: v1.4.4
 */
layui.define(['table'], function (exports) {

    var $ = layui.jquery;

    // 封装方法
    var mod = {
        /**
         * 渲染入口
         * @param myTable
         */
        render: function (myTable) {
            var tableBox = $(myTable.elem).next().children('.layui-table-box'),
                $main = $(tableBox.children('.layui-table-body').children('table').children('tbody').children('tr').toArray().reverse()),
                $fixLeft = $(tableBox.children('.layui-table-fixed-l').children('.layui-table-body').children('table').children('tbody').children('tr').toArray().reverse()),
                $fixRight = $(tableBox.children('.layui-table-fixed-r').children('.layui-table-body').children('table').children('tbody').children('tr').toArray().reverse()),
                mergeRecord = {};

            layui.each(myTable.cols, function(i1, item1){
                layui.each(item1, function(i2, item2){
                    if (item2.merge && item2.field) {
                        var mergeField = [item2.field];
                        if (item2.merge !== true) {
                            if (typeof item2.merge === 'string') {
                                mergeField = [item2.merge]
                            } else {
                                mergeField = item2.merge
                            }
                        }
                        mergeRecord[myTable.index + '-' + i1 + '-' + i2] = {mergeField: mergeField, rowspan:1}
                    }
                })
            })

            $main.each(function (i) {

                for (var item in mergeRecord) {
                    if (i===$main.length-1 || isMaster(i, item)) {
                        var tdHeight = $(this).children('[data-key="'+item+'"]').outerHeight(), patchHeight = 0; // 获取td高度
                        if ($main.eq(i).data('index') === 0) {patchHeight = 1}
                        $(this).children('[data-key="'+item+'"]').attr('rowspan', mergeRecord[item].rowspan).css({'position': 'static', 'height': tdHeight*mergeRecord[item].rowspan + patchHeight}).children().css({height: 'auto', 'white-space': 'normal', 'max-height': tdHeight*mergeRecord[item].rowspan + patchHeight - 10});
                        $fixLeft.eq(i).children('[data-key="'+item+'"]').attr('rowspan', mergeRecord[item].rowspan).css({'position': 'static', 'height': tdHeight*mergeRecord[item].rowspan + patchHeight}).children().css({height: 'auto', 'white-space': 'normal', 'max-height': tdHeight*mergeRecord[item].rowspan + patchHeight - 10});
                        $fixRight.eq(i).children('[data-key="'+item+'"]').attr('rowspan', mergeRecord[item].rowspan).css({'position': 'static', 'height': tdHeight*mergeRecord[item].rowspan + patchHeight}).children().css({height: 'auto', 'white-space': 'normal', 'max-height': tdHeight*mergeRecord[item].rowspan + patchHeight - 10});
                        mergeRecord[item].rowspan = 1;
                    } else {
                        $(this).children('[data-key="'+item+'"]').remove();
                        $fixLeft.eq(i).children('[data-key="'+item+'"]').remove();
                        $fixRight.eq(i).children('[data-key="'+item+'"]').remove();
                        mergeRecord[item].rowspan +=1;
                    }
                }
            })

            function isMaster (index, item) {
                var mergeField = mergeRecord[item].mergeField;
                var dataLength = layui.table.cache[myTable.id].length;
                for (var i=0; i<mergeField.length; i++) {

                    if (layui.table.cache[myTable.id][dataLength-2-index][mergeField[i]]
                        !== layui.table.cache[myTable.id][dataLength-1-index][mergeField[i]]) {
                        return true;
                    }
                }
                return false;
            }

        }
    };

    // 输出
    exports('tableMerge', mod);
});