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

public class SimplePDFReport : MonoBehaviour
{
    UserProxy userProxy = DAL.Instance.Get<UserProxy>();
    [Header("UI绑定")]
    public Button Btn_Export;

    [Header("基础信息")]
    public string studentName = "Chiva";
    private string experimentName = OperateSetting.Instance.m_CourseName;
    public string date = "2025-10-16";


    // 可外部替换 Logo
    public string logoFileName = "logo.png"; // 放在 StreamingAssets 下

    private ScoreInfo scorePanel; // 动态获取成绩信息
    private List<StepScore> stepScores = new List<StepScore>();
    private float totalScore;
    private string useTime;
  


    [System.Serializable]
    public class StepScore
    {
        public int index;
        public string stepName;
        public float score;
    }

    private void Start()
    {
        studentName = userProxy.userInfo.userName;
        Btn_Export.onClick.AddListener(ExportPDF);
    }


    [ContextMenu("导出成绩单 PDF")]
    public void ExportPDF()
    {
        scorePanel = UIKit.GetPanel<PC_OperatePanel>().ScoreInfo;
        if (scorePanel == null)
        {
            Debug.LogError("❌ 未找到 ScoreInfo 面板，请确保在当前场景中存在。");
            return;
        }
        totalScore = float.Parse(scorePanel.Score.text);
        useTime = scorePanel.UseTime.text;
        date = System.DateTime.Now.ToString("yyyy-MM-dd");

        // 生成步骤表数据
        Transform content = scorePanel.Content;
        stepScores.Clear();
        for (int i = 0; i < content.childCount; i++)
        {
            var item = content.GetChild(i).GetComponent<ScoreInfoItem>();
            if (item != null)
            {
                stepScores.Add(new StepScore()
                {
                    //index = i + 1,
                    index = int.Parse(item.stepIdText.text),
                    stepName = item.stepDescriptText.text,  // 步骤名
                    score = float.Parse(item.scoreSituationText.text) // 分数
                });
            }
        }

        // ====== PDF导出路径 ======
        string tmpSavePath = FolderBrowserHelper.GetPathFromWindowsExplorer("请选择成绩导出位置");

        string savePath = Path.Combine(Application.dataPath, $"{studentName}_成绩单.pdf");
        if (File.Exists(savePath)) File.Delete(savePath);
        Document doc = new Document(PageSize.A4, 60, 60, 80, 60); // 上边距略大，留页眉空间
        PdfWriter writer = PdfWriter.GetInstance(doc, new FileStream(savePath, FileMode.Create));

        // ===== 页脚和页码 =====
        writer.PageEvent = new PdfPageEvents();

        doc.Open();

        // ====== 字体设置 ======
        string fontPath = Path.Combine(Application.dataPath, "Fonts/SIMHEI.ttf");
        if (!File.Exists(fontPath))
        {
            Debug.LogError("字体文件未找到：" + fontPath);
            return;
        }

        BaseFont bfChinese = BaseFont.CreateFont(fontPath, BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
        PdfFont smallFont = new PdfFont(bfChinese, 10) { Color = new BaseColor(100, 100, 100) }; // 灰色
        PdfFont normalFont = new PdfFont(bfChinese, 12);
        PdfFont boldFont = new PdfFont(bfChinese, 12, PdfFont.BOLD);
        PdfFont titleFont = new PdfFont(bfChinese, 30, PdfFont.BOLD);

        PdfContentByte cb = writer.DirectContent;

        // ===== 横线 =====
        float lineY = doc.Top - 20f;
        cb.MoveTo(doc.Left, lineY);
        cb.LineTo(doc.Right, lineY);
        cb.Stroke();

        // ===== 页眉在横线之上 =====
        string headerText = "虚拟仿真实验中心";
        ColumnText.ShowTextAligned(
            cb,
            Element.ALIGN_CENTER,
            new Phrase(headerText, smallFont),
            (doc.Left + doc.Right) / 2,
            lineY + 10,  // 横线上方 10pt
            0
        );

        // ===== LOGO 横线上方左侧 =====
        string logoPath = Path.Combine(Application.streamingAssetsPath, logoFileName);

        // 统一去除 URL 前缀（特别是 file://）
        if (logoPath.StartsWith("file://"))
            logoPath = logoPath.Replace("file://", "");

        if (!File.Exists(logoPath))
        {
            // Unity Editor 下 StreamingAssets 在项目路径内
            logoPath = Path.Combine(Application.dataPath, "StreamingAssets", logoFileName);
        }
        float logoBottomY = lineY; // 用于计算标题位置
        if (File.Exists(logoPath))
        {
            try
            {
                byte[] logoBytes = File.ReadAllBytes(logoPath);
                iTextSharp.text.Image logo = iTextSharp.text.Image.GetInstance(logoBytes);

                // 👉 只固定高度，让宽度按比例缩放
                float targetHeight = 50f;  // 设定统一显示宽度
                float scaleFactor = targetHeight / logo.Height; // 缩放比例
                logo.ScalePercent(scaleFactor * 100); // iTextSharp 用百分比

                // 保证顶部距离横线 5pt
                float logoTopY = lineY + 5f + logo.ScaledHeight;
                float logoPosY = logoTopY - logo.ScaledHeight;
                logoBottomY = logoPosY;

                // 让左下角对齐页边距
                logo.SetAbsolutePosition(doc.Left, logoPosY);
                doc.Add(logo);

                Debug.Log($"✅ Logo 添加成功（原始大小: {logo.Width}x{logo.Height}, 缩放比例: {scaleFactor:F2}）");
            }
            catch (System.Exception e)
            {
                Debug.LogError("❌ 读取 Logo 出错：" + e.Message);
            }
        }
        else
        {
            Debug.LogWarning("⚠️ 未找到 Logo 文件：" + logoPath);
        }

        // ===== 主标题（单独一行居中） =====
        Paragraph title = new Paragraph("成 绩 单", titleFont);
        title.Alignment = Element.ALIGN_CENTER;
        title.SpacingBefore = 30f;
        title.SpacingAfter = 20f;
        doc.Add(title);

        // ===== 基本信息表格 =====
        PdfPTable infoTable = new PdfPTable(4);
        infoTable.WidthPercentage = 100;
        infoTable.SpacingBefore = 10f;
        infoTable.SpacingAfter = 15f;
        infoTable.SetWidths(new float[] { 1.2f, 2f, 1.2f, 2f });

        AddCell(infoTable, "姓名", boldFont, new BaseColor(235, 235, 235));
        AddCell(infoTable, studentName, normalFont);
        AddCell(infoTable, "实验日期", boldFont, new BaseColor(235, 235, 235));
        AddCell(infoTable, date, normalFont);

        AddCell(infoTable, "实验名称", boldFont, new BaseColor(235, 235, 235));
        AddCell(infoTable, experimentName, normalFont);
        AddCell(infoTable, "总成绩", boldFont, new BaseColor(235, 235, 235));
        AddCell(infoTable, totalScore.ToString("F1") + " 分", normalFont);

        AddCell(infoTable, "用时", boldFont, new BaseColor(235, 235, 235));
        AddCell(infoTable, useTime, normalFont);
        AddCell(infoTable, "", normalFont);
        AddCell(infoTable, "", normalFont);

        doc.Add(infoTable);

        // ===== 操作步骤表格 =====
        PdfPTable stepTable = new PdfPTable(3);
        stepTable.WidthPercentage = 100;
        stepTable.SetWidths(new float[] { 1f, 3f, 1f });

        AddHeaderCell(stepTable, "序号", boldFont);
        AddHeaderCell(stepTable, "操作步骤", boldFont);
        AddHeaderCell(stepTable, "分数", boldFont);

        foreach (var s in stepScores)
        {
            AddCell(stepTable, s.index.ToString(), normalFont);
            AddCell(stepTable, s.stepName, normalFont);
            AddCell(stepTable, s.score.ToString("F1"), normalFont);
        }

        doc.Add(stepTable);

        // ===== 评语 =====
        doc.Add(new Paragraph("\n"));
        string commentText = GenerateComment(totalScore);
        Paragraph comment = new Paragraph($"评语：{commentText}", normalFont);
        comment.SpacingBefore = 10;
        doc.Add(comment);

        doc.Close();
        writer.Close();

        Debug.Log($"✅ 成绩单导出成功：{savePath}");
    }
    private string GenerateComment(float score)
    {
        if (score >= 90f)
            return "表现优秀，操作熟练，理解深入。";
        else if (score >= 75f)
            return "完成良好，掌握较为扎实，可继续巩固。";
        else if (score >= 60f)
            return "基本达标，但仍需加强理解与操作细节。";
        else
            return "需改进，建议复习实验步骤并提高熟练度。";
    }

    private void AddHeaderCell(PdfPTable table, string text, PdfFont font)
    {
        PdfPCell cell = new PdfPCell(new Phrase(text, font));
        cell.BackgroundColor = new BaseColor(220, 220, 220);
        cell.HorizontalAlignment = Element.ALIGN_CENTER;
        cell.MinimumHeight = 25;
        table.AddCell(cell);
    }

    private void AddCell(PdfPTable table, string text, PdfFont font, BaseColor bg = null)
    {
        PdfPCell cell = new PdfPCell(new Phrase(text, font));
        cell.HorizontalAlignment = Element.ALIGN_CENTER;
        cell.VerticalAlignment = Element.ALIGN_MIDDLE;
        cell.MinimumHeight = 22;
        if (bg != null) cell.BackgroundColor = bg;
        table.AddCell(cell);
    }

    // ===== 页脚页码事件类 =====
    private class PdfPageEvents : PdfPageEventHelper
    {
        BaseFont bf;
        PdfFont footerFont;

        public PdfPageEvents()
        {
            string fontPath = Path.Combine(Application.dataPath, "Fonts/simhei.ttf");
            if (File.Exists(fontPath))
            {
                bf = BaseFont.CreateFont(fontPath, BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
                footerFont = new PdfFont(bf, 10);
            }
        }

        public override void OnEndPage(PdfWriter writer, Document document)
        {
            int pageN = writer.PageNumber;
            string text = "第 " + pageN + " 页 / 共 " + writer.PageNumber + " 页";

            PdfContentByte cb = writer.DirectContent;
            // 右下页码
            ColumnText.ShowTextAligned(
                cb,
                Element.ALIGN_RIGHT,
                new Phrase(text, footerFont),
                document.Right,
                document.Bottom - 20,
                0
            );

            // 左下固定文字
            ColumnText.ShowTextAligned(
                cb,
                Element.ALIGN_LEFT,
                new Phrase("虚拟仿真实验考核系统 © 2025", footerFont),
                document.Left,
                document.Bottom - 20,
                0
            );
        }
    }
}