using Aspose.Words;
using Aspose.Words.Tables;
using System.Text.Json;
using System.Text.Json.Serialization;

public static class JsonToWordHelper
{
    public static byte[] ConvertJsonToWord(string json)
    {
        if (string.IsNullOrWhiteSpace(json))
            throw new ArgumentException("JSON不能为空", nameof(json));

        var model = System.Text.Json.JsonSerializer.Deserialize<TripDocumentModel>(json, new JsonSerializerOptions
        {
            PropertyNameCaseInsensitive = true
        });

        if (model == null)
            throw new InvalidOperationException("JSON反序列化失败");

        model.Sections ??= new List<TripSection>();
        model.Closing ??= new List<string>();

        var doc = new Document();
        var builder = new DocumentBuilder(doc);

        SetDefaultFont(builder);

        // 标题
        builder.ParagraphFormat.ClearFormatting();
        builder.ParagraphFormat.Alignment = ParagraphAlignment.Center;
        builder.Font.Bold = true;
        builder.Font.Size = 22;
        builder.Writeln(model.Title ?? string.Empty);

        builder.InsertParagraph();

        // 收文单位
        builder.ParagraphFormat.ClearFormatting();
        builder.ParagraphFormat.Alignment = ParagraphAlignment.Left;
        builder.Font.Bold = false;
        builder.Font.Size = 16;
        builder.Writeln($"{model.Receiver}：");

        // 引言
        WriteNormalParagraph(builder, model.Intro);

        // 正文 sections
        foreach (var section in model.Sections)
        {
            if (!string.IsNullOrWhiteSpace(section.Title))
            {
                builder.ParagraphFormat.ClearFormatting();
                builder.ParagraphFormat.Alignment = ParagraphAlignment.Left;
                builder.Font.Bold = true;
                builder.Font.Size = 16;
                builder.Writeln(section.Title);
            }

            if (string.Equals(section.Type, "table", StringComparison.OrdinalIgnoreCase))
            {
                WriteTable(builder, section.Table);
                builder.InsertParagraph();
                continue;
            }

            if (section.Items != null && section.Items.Count > 0)
            {
                for (int i = 0; i < section.Items.Count; i++)
                {
                    var item = section.Items[i];
                    WriteNormalParagraph(builder, $"{i + 1}. {item.Title}");

                    if (item.Content != null)
                    {
                        foreach (var line in item.Content)
                        {
                            WriteNormalParagraph(builder, line);
                        }
                    }
                }
            }
            else if (section.Content != null && section.Content.Count > 0)
            {
                foreach (var line in section.Content)
                {
                    WriteNormalParagraph(builder, line);
                }
            }

            builder.InsertParagraph();
        }

        // 结尾
        foreach (var line in model.Closing)
        {
            WriteNormalParagraph(builder, line);
        }

        builder.InsertParagraph();

        // 落款
        builder.ParagraphFormat.ClearFormatting();
        builder.ParagraphFormat.Alignment = ParagraphAlignment.Right;
        builder.Font.Bold = false;
        builder.Font.Size = 16;
        builder.Writeln(model.Signature ?? string.Empty);
        builder.Writeln(model.Date ?? string.Empty);

        using var ms = new MemoryStream();
        doc.Save(ms, SaveFormat.Docx);
        return ms.ToArray();
    }

    private static void WriteNormalParagraph(DocumentBuilder builder, string? text)
    {
        if (string.IsNullOrWhiteSpace(text))
            return;

        builder.ParagraphFormat.ClearFormatting();
        builder.ParagraphFormat.Alignment = ParagraphAlignment.Left;
        builder.ParagraphFormat.FirstLineIndent = 32; // 首行缩进，约2字符
        builder.ParagraphFormat.SpaceAfter = 6;
        builder.Font.Bold = false;
        builder.Font.Size = 16;
        builder.Writeln(text.Trim());
    }

    private static void WriteTable(DocumentBuilder builder, TripTable? table)
    {
        if (table?.Headers == null || table.Headers.Count == 0)
            return;

        var colCount = table.Headers.Count;

        builder.StartTable();

        // 表头
        foreach (var header in table.Headers)
        {
            builder.InsertCell();
            builder.CellFormat.VerticalAlignment = CellVerticalAlignment.Center;
            builder.ParagraphFormat.Alignment = ParagraphAlignment.Center;
            builder.Font.Bold = true;
            builder.Write(header ?? string.Empty);
        }
        builder.EndRow();

        // 数据
        if (table.Rows != null)
        {
            foreach (var row in table.Rows)
            {
                var safeRow = row ?? new List<string>();

                for (int i = 0; i < colCount; i++)
                {
                    builder.InsertCell();
                    builder.CellFormat.VerticalAlignment = CellVerticalAlignment.Center;
                    builder.ParagraphFormat.Alignment = ParagraphAlignment.Center;
                    builder.Font.Bold = false;

                    var cellText = i < safeRow.Count ? safeRow[i] ?? string.Empty : string.Empty;
                    builder.Write(cellText);
                }

                builder.EndRow();
            }
        }

        var wordTable = builder.EndTable();

        // 表格样式
        wordTable.AutoFit(AutoFitBehavior.AutoFitToWindow);
        foreach (Row row in wordTable.Rows)
        {
            foreach (Cell cell in row.Cells)
            {
                cell.CellFormat.LeftPadding = 5;
                cell.CellFormat.RightPadding = 5;
                cell.CellFormat.TopPadding = 3;
                cell.CellFormat.BottomPadding = 3;
            }
        }
    }

    private static void SetDefaultFont(DocumentBuilder builder)
    {
        builder.Font.Name = "仿宋_GB2316";
        builder.Font.Size = 16;
    }
}

public class TripDocumentModel
{
    [JsonPropertyName("title")]
    public string? Title { get; set; }

    [JsonPropertyName("receiver")]
    public string? Receiver { get; set; }

    [JsonPropertyName("intro")]
    public string? Intro { get; set; }

    [JsonPropertyName("sections")]
    public List<TripSection>? Sections { get; set; }

    [JsonPropertyName("closing")]
    public List<string>? Closing { get; set; }

    [JsonPropertyName("signature")]
    public string? Signature { get; set; }

    [JsonPropertyName("date")]
    public string? Date { get; set; }
}

public class TripSection
{
    [JsonPropertyName("type")]
    public string? Type { get; set; }

    [JsonPropertyName("title")]
    public string? Title { get; set; }

    [JsonPropertyName("items")]
    public List<TripItem>? Items { get; set; }

    [JsonPropertyName("content")]
    public List<string>? Content { get; set; }

    [JsonPropertyName("table")]
    public TripTable? Table { get; set; }
}

public class TripItem
{
    [JsonPropertyName("title")]
    public string? Title { get; set; }

    [JsonPropertyName("content")]
    public List<string>? Content { get; set; }
}

public class TripTable
{
    [JsonPropertyName("headers")]
    public List<string>? Headers { get; set; }

    [JsonPropertyName("rows")]
    public List<List<string>>? Rows { get; set; }
}