using FineUIPro;
using System;
using System.Collections.Generic;
/// <summary>
/// 处理多表头的类
/// </summary>
public class MultiHeaderTable
{
    // 包含 rowspan，colspan 的多表头，方便生成 HTML 的 table 标签
    public List<List<object[]>> MultiTable = new List<List<object[]>>();
    // 最终渲染的列数组
    public List<GridColumn> Columns = new List<GridColumn>();


    public void ResolveMultiHeaderTable(GridColumnCollection columns)
    {
        List<object[]> row = new List<object[]>();
        foreach (GridColumn column in columns)
        {
            object[] cell = new object[4];
            cell[0] = 1;    // rowspan
            cell[1] = 1;    // colspan
            cell[2] = column;
            cell[3] = null;

            row.Add(cell);
        }

        ResolveMultiTable(row, 0);

        ResolveColumns(row);
    }

    private void ResolveColumns(List<object[]> row)
    {
        foreach (object[] cell in row)
        {
            GroupField groupField = cell[2] as GroupField;
            if (groupField != null && groupField.Columns.Count > 0)
            {
                List<object[]> subrow = new List<object[]>();
                foreach (GridColumn column in groupField.Columns)
                {
                    subrow.Add(new object[]
                    {
                                1,
                                1,
                                column,
                                groupField
                    });
                }

                ResolveColumns(subrow);
            }
            else
            {
                Columns.Add(cell[2] as GridColumn);
            }
        }

    }

    private void ResolveMultiTable(List<object[]> row, int level)
    {
        List<object[]> nextrow = new List<object[]>();

        foreach (object[] cell in row)
        {
            GroupField groupField = cell[2] as GroupField;
            if (groupField != null && groupField.Columns.Count > 0)
            {
                // 如果当前列包含子列，则更改当前列的 colspan，以及增加父列（向上递归）的colspan
                cell[1] = Convert.ToInt32(groupField.Columns.Count);
                PlusColspan(level - 1, cell[3] as GridColumn, groupField.Columns.Count - 1);

                foreach (GridColumn column in groupField.Columns)
                {
                    nextrow.Add(new object[]
                    {
                                1,
                                1,
                                column,
                                groupField
                    });
                }
            }
        }

        MultiTable.Add(row);

        // 如果当前下一行，则增加上一行（向上递归）中没有子列的列的 rowspan
        if (nextrow.Count > 0)
        {
            PlusRowspan(level);

            ResolveMultiTable(nextrow, level + 1);
        }
    }

    private void PlusRowspan(int level)
    {
        if (level < 0)
        {
            return;
        }

        foreach (object[] cells in MultiTable[level])
        {
            GroupField groupField = cells[2] as GroupField;
            if (groupField != null && groupField.Columns.Count > 0)
            {
                // ...
            }
            else
            {
                cells[0] = Convert.ToInt32(cells[0]) + 1;
            }
        }

        PlusRowspan(level - 1);
    }

    private void PlusColspan(int level, GridColumn parent, int plusCount)
    {
        if (level < 0)
        {
            return;
        }

        foreach (object[] cells in MultiTable[level])
        {
            GridColumn column = cells[2] as GridColumn;
            if (column == parent)
            {
                cells[1] = Convert.ToInt32(cells[1]) + plusCount;

                PlusColspan(level - 1, cells[3] as GridColumn, plusCount);
            }
        }
    }

}