using iTextSharp.text;
using iTextSharp.text.pdf;
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;

namespace Common
{
    public class HeaderAndFooterEvent : PdfPageEventHelper, IPdfPageEvent
    {
        #region 静态字段

        public static PdfTemplate tpl = null;
        public static bool PAGE_NUMBER = false;//为True时就生成 页眉和页脚  
        public static iTextSharp.text.Rectangle rect = PageSize.A4;   //文档大小

        /// <summary>
        /// 正文字体
        /// </summary>
        private static Font font;

        /// <summary>
        /// 页眉页脚字体
        /// </summary>
        public static string HeaderFooterFontName = "黑体";

        /// <summary>
        /// 页头页脚字号
        /// </summary>
        public static int HeaderFooterFontSize = 10;

        /// <summary>
        /// 页头页尾字体颜色
        /// </summary>
        public static BaseColor HeaderFooterFontColor = BaseColor.BLACK;

        /// <summary>
        /// 左边页眉
        /// </summary>
        public static string HeaderLeft { get; set; }
        /// <summary>
        /// 右边页眉
        /// </summary>
        public static string HeaderRight { get; set; }
        /// <summary>
        /// 左边页脚
        /// </summary>
        public static string FooterLeft { get; set; }
        /// <summary>
        /// 右边页脚
        /// </summary>
        public static string FooterRight { get; set; }

        #endregion

        #region 设置页面大小
        /// <summary>
        /// 设置页面大小
        /// </summary>
        /// <param name="type">页面大小(如"A4")</param>
        public static void SetPageSize(string type)
        {
            switch (type.Trim())
            {
                case "A4":
                    rect = PageSize.A4;
                    break;
                case "A8":
                    rect = PageSize.A8;
                    break;
            }
        }
        #endregion

        #region 设置字体
        /// <summary>
        /// 设置字体
        /// </summary>
        /// <param name="size">字体大小</param>
        public static void SetFont(BaseColor color, string fontName = "华文中宋", float size = 12, int style = Font.NORMAL)
        {
            font = new Font(BaseFontAndSize(fontName), size, style, color);
        }
        #endregion

        #region 生成页眉页脚

        /// <summary>
        /// 关闭一个页面时发生  
        /// </summary>
        public override void OnEndPage(PdfWriter writer, Document document)
        {
            if (PAGE_NUMBER)
            {
                Font HeaderFooterFont = FontAndSize(HeaderFooterFontName, HeaderFooterFontSize, Font.NORMAL, HeaderFooterFontColor);
                Phrase header_left = new Phrase(HeaderLeft, HeaderFooterFont);
                Phrase header_right = new Phrase(HeaderRight, HeaderFooterFont);

                Phrase footer_left = new Phrase(FooterLeft, HeaderFooterFont);
                Phrase footer_center = new Phrase("第" + (writer.PageNumber) + "页/共     页", HeaderFooterFont);
                Phrase footer_right = new Phrase(FooterRight, HeaderFooterFont);



                PdfContentByte cb = writer.DirectContent;

                //模版 显示总共页数  
                cb.AddTemplate(tpl, document.Right - 290 + document.LeftMargin, document.Bottom - 15);//调节模版显示的位置  

                //页眉显示的位置  
                ColumnText.ShowTextAligned(cb, Element.ALIGN_CENTER, header_right,
                       document.Right - 50 + document.LeftMargin, document.Top + 15, 0);

                ColumnText.ShowTextAligned(cb, Element.ALIGN_CENTER, header_left,
                       document.Right - 500 + document.LeftMargin, document.Top + 15, 0);

                //页脚显示的位置  
                ColumnText.ShowTextAligned(cb, Element.ALIGN_CENTER, footer_left,
                       document.Right - 535 + document.LeftMargin, document.Bottom - 15, 0);

                ColumnText.ShowTextAligned(cb, Element.ALIGN_CENTER, footer_center,
                       document.Right - 300 + document.LeftMargin, document.Bottom - 15, 0);

                ColumnText.ShowTextAligned(cb, Element.ALIGN_CENTER, footer_right,
                       document.Right - 80 + document.LeftMargin, document.Bottom - 15, 0);
            }
        }

        /// <summary>
        /// 打开一个新页面时发生 
        /// </summary>
        public override void OnStartPage(PdfWriter writer, Document document)
        {
            if (PAGE_NUMBER)
            {
                writer.PageCount = writer.PageNumber - 1;
            }
        }

        /// <summary>
        /// 关闭PDF文档时发生该事件
        /// </summary>
        public override void OnCloseDocument(PdfWriter writer, Document document)
        {
            BaseFont bf = BaseFontAndSize(HeaderFooterFontName);
            tpl.BeginText();
            tpl.SetFontAndSize(bf, HeaderFooterFontSize);
            tpl.ShowText((writer.PageNumber - 1).ToString());//总页数 
            tpl.EndText();
            tpl.ClosePath();
        }
        #endregion

        #region 私有方法

        private static Font FontAndSize(string font_name, int size, int style, BaseColor baseColor)
        {
            BaseFont baseFont;
            BaseFont.AddToResourceSearch("iTextAsian.dll");
            BaseFont.AddToResourceSearch("iTextAsianCmaps.dll");
            Font font = null;
            string file_name = "";
            int fontStyle;
            switch (font_name)
            {
                case "黑体":
                    file_name = "SIMHEI.TTF";
                    break;
                case "华文中宋":
                    file_name = "STZHONGS.TTF";
                    break;
                case "宋体":
                    file_name = "SIMYOU.TTF";
                    break;
                default:
                    file_name = "SIMYOU.TTF";
                    break;
            }
            baseFont = BaseFont.CreateFont(@"c:/windows/fonts/" + file_name, BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);

            if (style < -1)
            {
                fontStyle = Font.NORMAL;
            }
            else
            {
                fontStyle = style;
            }
            font = new Font(baseFont, size, fontStyle, baseColor);
            return font;
        }
        private static BaseFont BaseFontAndSize(string font_name)
        {
            BaseFont baseFont;
            BaseFont.AddToResourceSearch("iTextAsian.dll");
            BaseFont.AddToResourceSearch("iTextAsianCmaps.dll");
            string file_name = "";
            switch (font_name)
            {
                case "黑体":
                    file_name = "SIMHEI.TTF";
                    break;
                case "华文中宋":
                    file_name = "STZHONGS.TTF";
                    break;
                case "宋体":
                    file_name = "SIMFANG.TTF";
                    break;
                default:
                    file_name = "SIMFANG.TTF";
                    //file_name = "SIMYOU.TTF";
                    break;
            }
            baseFont = BaseFont.CreateFont(@"c:/windows/fonts/" + file_name, BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
            return baseFont;
        }

        #endregion

        #region 添加段落

        /// <summary>
        /// 添加段落
        /// </summary>
        /// <param name="content">内容</param>
        /// <param name="Alignment">对齐方式（1为居中，0为居左，2为居右）</param>
        /// <param name="SpacingAfter">段后空行数（0为默认值）</param>
        /// <param name="SpacingBefore">段前空行数（0为默认值）</param>
        /// <param name="MultipliedLeading">行间距（0为默认值）</param>
        public static Paragraph AddParagraph(string content, int Alignment, float SpacingAfter, float SpacingBefore, float MultipliedLeading)
        {
            Paragraph pra = new Paragraph(content, font);
            pra.Alignment = Alignment;
            pra.SpacingAfter = SpacingAfter;
            pra.SpacingBefore = SpacingBefore;
            pra.MultipliedLeading = MultipliedLeading;
            return pra;
        }

        public static Paragraph AddParagraph(string content, int Alignment, float MultipliedLeading)
        {
            Paragraph pra = new Paragraph(content, font);
            pra.Alignment = Alignment;
            pra.MultipliedLeading = MultipliedLeading;
            return pra;
        }

        public static void AddPhrase(PdfWriter writer, Document document, string content, float marginLift, float marginBottom)
        {
            Phrase phrase = new Phrase(content, font);

            PdfContentByte cb = writer.DirectContent;
            ColumnText.ShowTextAligned(cb, Element.ALIGN_CENTER, phrase,
                       marginLift + document.LeftMargin, marginBottom, 0);

        }

        #endregion

        #region 添加图片
        /// <summary>
        /// 添加图片
        /// <param name="Alignment">对齐方式 (0/1/2)</param>
        /// <param name="marginRight">页边距</param>
        /// <param name="marginBottom">页边距</param>
        /// </summary>
        public static iTextSharp.text.Image AddImage(string path, int Alignment, float marginRight, float marginBottom)
        {
            Image img = Image.GetInstance(new Uri(path));
            img.Alignment = Alignment;
            //等比缩放，宽与高的缩放系数哪个大就取哪一个（比如高的系数是0.8，宽的是0.7，则取0.7。这样图片就不会超出页面范围）
            if (img.Width > img.Height)
            {
                //这里计算图片的缩放系数，因为图片width>height,所以将图片旋转90度以适应页面，计算缩放系数的时候宽与高对调
                float PageHeight = PageSize.A4.Height - marginBottom * 3;
                double percentHeight = Math.Round((PageHeight / img.Width), 2);

                float PageWidth = PageSize.A4.Width - marginRight * 2;
                double percentWidth = Math.Round((PageWidth / img.Height), 2);

                double percent = percentHeight > percentWidth ? percentWidth : percentHeight;
                img.ScalePercent((float)percent * 100);
                img.RotationDegrees = 90f;
            }
            else
            {
                float PageHeight = PageSize.A4.Height - marginBottom * 3;
                double percentHeight = Math.Round((PageHeight / img.Height), 2);

                float PageWidth = PageSize.A4.Width - marginRight * 2;
                double percentWidth = Math.Round((PageWidth / img.Width), 2);

                double percent = percentHeight > percentWidth ? percentWidth : percentHeight;
                img.ScalePercent((float)percent * 100);
            }
            return img;
        }

        /// <summary>
        /// 在PDF生成表格
        /// </summary>
        public static void CreateTable(DataTable dt, Document document)
        {
            iTextSharp.text.pdf.PdfPTable datatable = new PdfPTable(5);
            float[] headerwidths = { 20, 50, 40, 40, 50};
            datatable.SetWidths(headerwidths);
            datatable.WidthPercentage = 100;
            datatable.HeaderRows = 1;
            //datatable.PaddingTop = 5;
            string[] array = new string[] { "序号", "项目", "结果", "单位", "参考区间" };
            for (int i = 0; i < array.Length; i++)
            {
                Phrase ph = new Phrase(array[i], font);
                iTextSharp.text.pdf.PdfPCell cell1 = new PdfPCell(ph);
                cell1.HorizontalAlignment = Element.ALIGN_CENTER;
                cell1.BackgroundColor = new iTextSharp.text.BaseColor(0xC0, 0xC0, 0xC0);
                datatable.AddCell(cell1);
            }

            foreach (DataRow R in dt.Rows)
            {
                datatable.AddCell(new Phrase(R["sequenceNo"].ToString(), font));
                datatable.AddCell(new Phrase(R["itemName"].ToString(), font));
                datatable.AddCell(new Phrase(R["result"].ToString(), font));
                datatable.AddCell(new Phrase(R["unit"].ToString(), font));
                datatable.AddCell(new Phrase(R["range"].ToString(), font));
            }

            document.Add(datatable);
        }
        #endregion

    }
}