using iTextSharp.text;
using iTextSharp.text.pdf;
using System;
using System.Collections.Generic;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;

namespace IStation.DataFile
{
    /// <summary>
    /// ITextSharp辅助类
    /// </summary>
    public static class ITextSharpHelper
    {
#pragma warning disable CA1416 // 验证平台兼容性
        /// <summary>
        /// 在指定位置添加图片
        /// </summary>
        /// <param name="ws">PdfWriter</param>
        /// <param name="img"></param>
        /// <param name="x">横坐标</param>
        /// <param name="y">反向纵坐标</param>
        public static void AddImageAtPosition(this PdfWriter ws, System.Drawing.Image img, int x, int y)
        {
            var iTextImg = iTextSharp.text.Image.GetInstance(img, ImageFormat.Png);
            //若不缩放四分之三，图片显示过大。暂时未探索出图片为什么图片会变大，待解决。
            iTextImg.ScalePercent(75);
            iTextImg.SetAbsolutePosition(x, y);
            ws.DirectContent.AddImage(iTextImg);
        }

        /// <summary>
        /// 在指定位置添加图片
        /// </summary>
        /// <param name="ws">PdfWriter</param>
        /// <param name="x">横坐标</param>
        /// <param name="y">反向纵坐标</param>
        /// <param name="filePath">路径</param>
        public static void AddImageAtPosition(this PdfWriter ws, string filePath, int x, int y)
        {
            var iTextImg = iTextSharp.text.Image.GetInstance(filePath);
            //若不缩放四分之三，图片显示过大。暂时未探索出图片为什么图片会变大，待解决。
            iTextImg.ScalePercent(75);
            iTextImg.SetAbsolutePosition(x, y);
            ws.DirectContent.AddImage(iTextImg);
        }

        /// <summary>
        /// 在指定位置添加文字
        /// </summary>
        /// <param name="ws">PdfWriter</param>
        /// <param name="text">文本</param>
        /// <param name="font">字体</param>
        /// <param name="x">横坐标</param>
        /// <param name="y">反向纵坐标</param>
        /// <param name="rotation">旋转角度，逆时针</param>
        public static void AddTextAtPosition(this PdfWriter ws, string text, iTextSharp.text.Font font, float x, float y, float rotation = 0)
        {
            var cb = ws.DirectContent;
            var txt = new Phrase(text, font);
            ColumnText.ShowTextAligned(cb, Element.ALIGN_CENTER, txt, x, y, 45);
        }

        /// <summary>
        /// 获取PdfImage
        /// </summary>
        /// <param name="img"></param>
        /// <returns></returns>
        public static iTextSharp.text.Image CreatePdfImage(this System.Drawing.Image img)
        {
            return iTextSharp.text.Image.GetInstance(img, ImageFormat.Png);
        }
#pragma warning restore CA1416 // 验证平台兼容性
        /// <summary>
        /// 获取背景颜色为白色的PdfImage
        /// </summary>
        /// <param name="img"></param>
        /// <returns></returns>
        public static iTextSharp.text.Image CreatePdfImageInWhite(this System.Drawing.Image img)
        {
            return iTextSharp.text.Image.GetInstance(img, BaseColor.White);
        }

        /// <summary>
        /// 获取Pdf基础字体
        /// </summary>
        /// <returns></returns>
        public static BaseFont GetBaseFont()
        {
            return BaseFont.CreateFont(@"C:\WINDOWS\Fonts\simhei.ttf", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="fontPath"></param>
        /// <returns></returns>
        public static BaseFont GetLocalBaseFont(string fontPath) 
        {
            if (System.IO.File.Exists(fontPath))
            {
                return BaseFont.CreateFont(fontPath, BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
            }
            else 
            {
                return GetBaseFont();
            }
        }

        /// <summary>
        /// 字体设置
        /// </summary>
        /// <param name="baseFont"></param>
        /// <param name="size"></param>
        /// <returns></returns>
        public static iTextSharp.text.Font CreateFontBySize(this BaseFont baseFont, float size)
        {
            return new iTextSharp.text.Font(baseFont, size);
        }

        /// <summary>
        /// 获取特定颜色大小的Pdf字体
        /// </summary>
        /// <param name="baseFont"></param>
        /// <param name="size"></param>
        /// <param name="color"></param>
        /// <returns></returns>
        public static iTextSharp.text.Font CreateFontBySize(this BaseFont baseFont, float size, System.Drawing.Color color)
        {
            var font = new iTextSharp.text.Font(baseFont, size);
            font.Color = new BaseColor(color);
            return font;
        }

        /// <summary>
        /// 创建表格
        /// </summary>
        /// <param name="spanNum">表格的列数</param>
        /// <param name="percentage">表格所占界面的百分比</param>
        /// <returns></returns>
        public static PdfPTable CreateTable(int spanNum, float percentage = 100)
        {
            var pdfTable = new PdfPTable(spanNum);
            pdfTable.WidthPercentage = percentage;
            return pdfTable;
        }

        /// <summary>
        /// 创建表格
        /// </summary>
        /// <param name="relativeWidths"></param>
        /// <returns></returns>
        public static PdfPTable CreateTable(float[] relativeWidths)
        {
            return new PdfPTable(relativeWidths);
        }

        /// <summary>
        /// 获取Pdf基础颜色
        /// </summary>
        /// <param name="color"></param>
        /// <returns></returns>
        public static BaseColor GetPdfBaseColor(this System.Drawing.Color color)
        {
            return new BaseColor(color);
        }

        /// <summary>
        /// 添加表格单元格
        /// </summary>
        public static PdfPCell CreateTableCell
            (
            this PdfPTable table, PdfPTable cellTable,
            int colSpan, int rowSpan,
            int border, float borderWidthLeft = -1, float borderWidthRight = -1, float borderWidthTop = -1, float borderWidthBottom = -1,
            float paddingLeft = -1, float paddingRight = -1, float paddingTop = -1, float paddingBottom = -1
            )
        {
            var cell = new PdfPCell(cellTable);
            cell.Padding = 0;
            cell.Colspan = colSpan;
            cell.Rowspan = rowSpan;
            cell.UseAscender = true;
            cell.Border = border;

            if (borderWidthLeft > 0)
                cell.BorderWidthLeft = borderWidthLeft;
            if (borderWidthRight > 0)
                cell.BorderWidthRight = borderWidthRight;
            if (borderWidthTop > 0)
                cell.BorderWidthTop = borderWidthTop;
            if (borderWidthBottom > 0)
                cell.BorderWidthBottom = borderWidthBottom;

            if (paddingLeft > 0)
                cell.PaddingLeft = paddingLeft;
            if (paddingRight > 0)
                cell.PaddingRight = paddingRight;
            if (paddingTop > 0)
                cell.PaddingTop = paddingTop;
            if (paddingBottom > 0)
                cell.PaddingBottom = paddingBottom;

            table.AddCell(cell);
            return cell;
        }

        /// <summary>
        /// 创建单元格
        /// </summary>
        /// <param name="pdfTable">创建单元格的表格</param>
        /// <param name="content">单元格内容</param>
        /// <param name="font">单元格的字体</param>
        /// <param name="colSpan">单元格所占列数</param>
        /// <param name="rowSpan">单元格所占行数</param>
        /// <param name="border">边框设置</param>
        /// <param name="h_alignment">横向排列</param>
        /// <param name="v_alignment">纵向排列</param>
        /// <param name="minHeight">最低高度</param>
        /// <param name="fixHeight">固定高度</param>
        /// <param name="bc">单元格背景颜色</param>
        /// <param name="borderWidthLeft">左边框宽度</param>
        /// <param name="borderWidthRight">有边框宽度</param>
        /// <param name="borderWidthTop">上边框宽度</param>
        /// <param name="borderWidthBottom">下边框宽度</param>
        /// <returns></returns>
        public static PdfPCell CreateCell
            (
            this PdfPTable pdfTable,
            string content, iTextSharp.text.Font font,
            int colSpan, int rowSpan,
            int border,
            float minHeight = -1, float fixHeight = -1,
            int h_alignment = Element.ALIGN_CENTER, int v_alignment = Element.ALIGN_MIDDLE,
            BaseColor bc = null,
            float borderWidthLeft = -1, float borderWidthRight = -1, float borderWidthTop = -1, float borderWidthBottom = -1
            )
        {
            var cell = new PdfPCell(new Paragraph(content, font));
            cell.Colspan = colSpan;
            cell.Rowspan = rowSpan;
            cell.UseAscender = true;
            cell.Border = border;
            cell.HorizontalAlignment = h_alignment;
            cell.VerticalAlignment = v_alignment;
            if (minHeight > 0)
                cell.MinimumHeight = minHeight;
            if (fixHeight > 0)
                cell.FixedHeight = fixHeight;
            if (bc != null)
                cell.BackgroundColor = bc;
            if (borderWidthLeft > 0)
                cell.BorderWidthLeft = borderWidthLeft;
            if (borderWidthRight > 0)
                cell.BorderWidthRight = borderWidthRight;
            if (borderWidthTop > 0)
                cell.BorderWidthTop = borderWidthTop;
            if (borderWidthBottom > 0)
                cell.BorderWidthBottom = borderWidthBottom;
            pdfTable.AddCell(cell);
            return cell;
        }

        /// <summary>
        /// 创建图片单元格
        /// </summary>
        /// <param name="pdfTable">创建单元格的表格</param>
        /// <param name="img">单元格内的图片</param>
        /// <param name="colSpan">单元格所占列数</param>
        /// <param name="rowSpan">单元格所占行数</param>
        /// <param name="border">边框设置</param>
        /// <param name="minHeight">最低高度</param>
        /// <param name="fixHeight">固定高度</param>
        /// <param name="bc">单元格背景颜色</param>
        /// <param name="borderWidthLeft">左边框宽度</param>
        /// <param name="borderWidthRight">有边框宽度</param>
        /// <param name="borderWidthTop">上边框宽度</param>
        /// <param name="borderWidthBottom">下边框宽度</param>
        /// <param name="h_alignment"></param>
        ///  /// <param name="v_alignment"></param>
        /// <returns></returns>
        public static PdfPCell CreateImageCell
            (
            this PdfPTable pdfTable,
            System.Drawing.Image img,
            int colSpan, int rowSpan,
            int border,
            float minHeight = -1, float fixHeight = -1,
            int h_alignment = Element.ALIGN_CENTER, int v_alignment = Element.ALIGN_MIDDLE,
            BaseColor bc = null,
            float borderWidthLeft = -1, float borderWidthRight = -1, float borderWidthTop = -1, float borderWidthBottom = -1
            )
        {
            var cell = new PdfPCell();
            cell.HorizontalAlignment = h_alignment;
            cell.VerticalAlignment = v_alignment;
            var pdfImg = img.CreatePdfImage();
            pdfImg.Alignment = iTextSharp.text.Image.ALIGN_MIDDLE;
            cell.Image = pdfImg;
            cell.Colspan = colSpan;
            cell.Rowspan = rowSpan;
            cell.Border = border;
            if (minHeight > 0)
                cell.MinimumHeight = minHeight;
            if (fixHeight > 0)
                cell.FixedHeight = fixHeight;
            if (bc != null)
                cell.BackgroundColor = bc;
            if (borderWidthLeft > 0)
                cell.BorderWidthLeft = borderWidthLeft;
            if (borderWidthRight > 0)
                cell.BorderWidthRight = borderWidthRight;
            if (borderWidthTop > 0)
                cell.BorderWidthTop = borderWidthTop;
            if (borderWidthBottom > 0)
                cell.BorderWidthBottom = borderWidthBottom;
            pdfTable.AddCell(cell);
            return cell;
        }



    }
}