using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Text;
using System.IO;
using AspNet = System.Web.UI.WebControls;

namespace FineUI.Examples.data
{
    public partial class grid_excel_groupfield : PageBase
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                BindGrid();
            }
        }

        #region BindGrid
        private void BindGrid()
        {
            ViewState["UseDataSource1"] = true;

            DataTable table = DataSourceUtil.GetDataTable();

            Grid1.DataSource = table;
            Grid1.DataBind();
        }

        #endregion

        #region Events

        protected void Button2_Click(object sender, EventArgs e)
        {
            DataTable table;
            if (Convert.ToBoolean(ViewState["UseDataSource1"]))
            {
                ViewState["UseDataSource1"] = false;
                table = DataSourceUtil.GetDataTable2();
            }
            else
            {
                ViewState["UseDataSource1"] = true;
                table = DataSourceUtil.GetDataTable();
            }

            Grid1.DataSource = table;
            Grid1.DataBind();
        }

        #region oldcode

        //protected void Button1_Click(object sender, EventArgs e)
        //{
        //    Response.ClearContent();
        //    Response.AddHeader("content-disposition", "attachment; filename=myexcel.xls");
        //    Response.ContentType = "application/excel";
        //    Response.ContentEncoding = System.Text.Encoding.UTF8;
        //    Response.Write(GetGridTableHtml(Grid1));
        //    Response.End();
        //}

        //private string GetGridTableHtml(Grid grid)
        //{
        //    StringBuilder sb = new StringBuilder();

        //    sb.Append("<meta http-equiv=\"content-type\" content=\"application/excel; charset=UTF-8\"/>");


        //    sb.Append("<table cellspacing=\"0\" rules=\"all\" border=\"1\" style=\"border-collapse:collapse;\">");

        //    sb.Append("<tr>");
        //    foreach (GridColumn column in grid.Columns)
        //    {
        //        sb.AppendFormat("<td>{0}</td>", column.HeaderText);
        //    }
        //    sb.Append("</tr>");


        //    foreach (GridRow row in grid.Rows)
        //    {
        //        sb.Append("<tr>");

        //        foreach (GridColumn column in grid.Columns)
        //        {
        //            string html = row.Values[column.ColumnIndex].ToString();

        //            if (column.ColumnID == "tfNumber")
        //            {
        //                html = (row.FindControl("spanNumber") as System.Web.UI.HtmlControls.HtmlGenericControl).InnerText;
        //            }
        //            else if (column.ColumnID == "tfGender")
        //            {
        //                html = (row.FindControl("labGender") as AspNet.Label).Text;
        //            }


        //            sb.AppendFormat("<td>{0}</td>", html);
        //        }

        //        sb.Append("</tr>");
        //    }

        //    sb.Append("</table>");

        //    return sb.ToString();
        //}

        #endregion

        protected void Button1_Click(object sender, EventArgs e)
        {
            Response.ClearContent();
            Response.AddHeader("content-disposition", "attachment; filename=myexcel.xls");
            Response.ContentType = "application/excel";
            Response.ContentEncoding = System.Text.Encoding.UTF8;
            Response.Write(GetGridTableHtml(Grid1));
            Response.End();
        }

        private string GetGridTableHtml(Grid grid)
        {
            StringBuilder sb = new StringBuilder();

            MultiHeaderTable mht = new MultiHeaderTable();
            mht.ResolveMultiHeaderTable(Grid1.Columns);


            sb.Append("<meta http-equiv=\"content-type\" content=\"application/excel; charset=UTF-8\"/>");


            sb.Append("<table cellspacing=\"0\" rules=\"all\" border=\"1\" style=\"border-collapse:collapse;\">");

            foreach (List<object[]> rows in mht.MultiTable)
            {
                sb.Append("<tr>");
                foreach (object[] cell in rows)
                {
                    int rowspan = Convert.ToInt32(cell[0]);
                    int colspan = Convert.ToInt32(cell[1]);
                    GridColumn column = cell[2] as GridColumn;

                    sb.AppendFormat("<th{0}{1}{2}>{3}</th>",
                        rowspan != 1 ? " rowspan=\"" + rowspan + "\"" : "",
                        colspan != 1 ? " colspan=\"" + colspan + "\"" : "",
                        colspan != 1 ? " style=\"text-align:center;\"" : "",
                        column.HeaderText);
                }
                sb.Append("</tr>");
            }


            foreach (GridRow row in grid.Rows)
            {
                sb.Append("<tr>");

                foreach (GridColumn column in mht.Columns)
                {
                    string html = row.Values[column.ColumnIndex].ToString();

                    if (column.ColumnID == "tfNumber")
                    {
                        html = (row.FindControl("spanNumber") as System.Web.UI.HtmlControls.HtmlGenericControl).InnerText;
                    }
                    else if (column.ColumnID == "tfGender")
                    {
                        html = (row.FindControl("labGender") as AspNet.Label).Text;
                    }


                    sb.AppendFormat("<td>{0}</td>", html);
                }

                sb.Append("</tr>");
            }

            sb.Append("</table>");

            return sb.ToString();
        }


        #region 多表头处理

        /// <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);
                    }
                }
            }

        }
        #endregion

        #endregion

    }
}
