using iTextSharp.text;
using iTextSharp.text.pdf;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using PdfFont = iTextSharp.text.Font;

public class HeaderFooter : PdfPageEventHelper
{
    private PdfTemplate totalPages;
    private BaseFont baseFont;
    private PdfFont headFont;
    private PdfFont pdfFont;
    private Image headLogo;


    public override void OnOpenDocument(PdfWriter writer, Document document)
    {
        baseFont = BaseFont.CreateFont(Application.streamingAssetsPath + "/Fonts/成绩字体.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
        headLogo = Image.GetInstance(Application.streamingAssetsPath + "/Logos/成绩logo.png");

        headFont = new PdfFont(baseFont, 10, PdfFont.NORMAL, new BaseColor(128, 128, 128));
        pdfFont = new PdfFont(baseFont, 12);

        totalPages = writer.DirectContent.CreateTemplate(100, 100);
    }

    public override void OnEndPage(PdfWriter writer, Document document)
    {
        base.OnEndPage(writer, document);

        AddHeader(writer, document);

        AddFooter(writer, document);
    }

    public override void OnCloseDocument(PdfWriter writer, Document document)
    {
        base.OnCloseDocument(writer, document);

        // 在文档关闭时写入总页数
        //ColumnText.ShowTextAligned(totalPages, Element.ALIGN_LEFT,
        //    new Phrase((writer.PageNumber - 1).ToString(), headFont),
        //    2, 2, 0);
    }

    private void AddHeader(PdfWriter writer, Document document)
    {
        PdfPTable headerTable = new PdfPTable(2);

        headerTable.TotalWidth = document.PageSize.Width - document.LeftMargin - document.RightMargin;
        //设置比例宽度
        headerTable.SetWidths(new float[] { 1, 1.5f });

        //图片高度
        float targetHeight = 30;

        //图片单元格
        headLogo.ScaleAbsoluteWidth((targetHeight / headLogo.Height) * headLogo.Width);
        headLogo.ScaleAbsoluteHeight(targetHeight);
        PdfPCell imageCell = new PdfPCell(headLogo);
        imageCell.Border = Rectangle.BOTTOM_BORDER;
        imageCell.HorizontalAlignment = Element.ALIGN_LEFT;
        imageCell.BorderColor = BaseColor.GRAY;
        imageCell.BorderWidth = 1f;
        imageCell.PaddingBottom = 5f;

        //创建一个单元格
        PdfPCell cell = new PdfPCell(new Phrase("虚拟仿真实验中心", headFont));
        //单元格边界
        cell.Border = Rectangle.BOTTOM_BORDER;
        cell.BorderColor = BaseColor.GRAY;
        cell.BorderWidth = 1f;
        cell.PaddingBottom = 5f;
        cell.HorizontalAlignment = Element.ALIGN_LEFT;
        cell.VerticalAlignment = Element.ALIGN_BOTTOM;

        headerTable.AddCell(imageCell);
        headerTable.AddCell(cell);
        headerTable.WriteSelectedRows(0, -1, document.LeftMargin, document.PageSize.Height - 20, writer.DirectContent);
    }

    /// <summary>
    /// 添加页脚
    /// </summary>
    /// <param name="writer"></param>
    /// <param name="document"></param>
    private void AddFooter(PdfWriter writer, Document document)
    {
        PdfPTable footerTable = new PdfPTable(2);

        footerTable.TotalWidth = document.PageSize.Width - document.LeftMargin - document.RightMargin;

        PdfPCell leftCell = new PdfPCell(new Phrase("虚拟仿真实验考核系统 © 2025", headFont));
        leftCell.Border = Rectangle.TOP_BORDER;
        leftCell.BorderColor = BaseColor.GRAY;
        leftCell.HorizontalAlignment = Element.ALIGN_LEFT;

        PdfPCell middleCell = new PdfPCell(new Phrase($"第{writer.PageNumber}页", headFont));
        middleCell.Border = Rectangle.TOP_BORDER;
        middleCell.BorderColor = BaseColor.GRAY;
        middleCell.HorizontalAlignment = Element.ALIGN_RIGHT;

        //PdfPCell rightCell = new PdfPCell(new Phrase("总页数", headFont));
        //rightCell.Border = Rectangle.TOP_BORDER;
        //rightCell.BorderColor = BaseColor.GRAY;
        //rightCell.HorizontalAlignment = Element.ALIGN_RIGHT;

        footerTable.AddCell(leftCell);
        footerTable.AddCell(middleCell);
        //footerTable.AddCell(rightCell);

        footerTable.WriteSelectedRows(0, -1, document.LeftMargin, document.BottomMargin - 10, writer.DirectContent);
    }


}