using COP.Info;
using DocumentFormat.OpenXml.EMMA;
using DocumentFormat.OpenXml.Office2010.Excel;
using DocumentFormat.OpenXml.Spreadsheet;
using NPOI.HSSF.Util;
using NPOI.SS.UserModel;
using NPOI.SS.Util;
using NPOI.XSSF.UserModel;
using System;
using System.ComponentModel;
using BorderStyle = NPOI.SS.UserModel.BorderStyle;
using HorizontalAlignment = NPOI.SS.UserModel.HorizontalAlignment;

namespace COP
{
    public partial class ExcelTable : Component
    {
        public ExcelTable()
        {
            InitializeComponent();
        }

        public ExcelTable(IContainer container)
        {
            container.Add(this);

            InitializeComponent();
        }

        public void GenerateDocument<T>(ExcelTableInfo<T> info) where T: class
        {
            if (string.IsNullOrEmpty(info.FilePath))
            {
                throw new ArgumentException("File path is null or empty.");
            }
            if (string.IsNullOrEmpty(info.DocumentTitle))
            {
                throw new ArgumentException("Document title is null or empty.");
            }
            if (info.Data == null || info.Data.Count == 0)
            {
                throw new ArgumentException("Data is null or empty.");
            }

            var workbook = new XSSFWorkbook();
            var sheet = workbook.CreateSheet("Sheet1");

            sheet.CreateRow(0).CreateCell(0).SetCellValue(info.DocumentTitle);

            int curRow = 1;
            int curCol = 0;
            List<string> headers = new();

            var dataCellStyle = GetDataCellStyle(workbook);
            var headerCellStyle = GetHeaderCellStyle(workbook);

            foreach (var header in info.Headers)
            {
                headers.Add(header.Key);

                var currentRow = sheet.CreateRow(curRow);
                var curCell = currentRow.CreateCell(curCol);

                if (header.Value.Item1.Item1.Count > 1)
                {
                    sheet.AddMergedRegion(new CellRangeAddress(curRow, curRow + header.Value.Item1.Item1.Count - 1, curCol, curCol));
                    curCol++;
                    foreach (var item in header.Value.Item1.Item2)
                    {
                        int id = header.Value.Item1.Item2.IndexOf(item);
                        var cellValue = currentRow.CreateCell(1);
                        cellValue.SetCellValue(item);
                        currentRow.Height = (short)(header.Value.Item2[id] * 20);
                        headers.Add(item);
                        cellValue.CellStyle = headerCellStyle;
                        currentRow = sheet.CreateRow(currentRow.RowNum + 1);                        
                    }                    
                }
                else 
                {
                    int id = header.Value.Item1.Item1.IndexOf(header.Value.Item1.Item1[0]);
                    sheet.AddMergedRegion(new CellRangeAddress(curRow, curRow, curCol, curCol + 1));
                    currentRow.Height = (short)(header.Value.Item2[id] * 20);
                    curRow++;
                }

                curCell.SetCellValue(header.Key);
                curCell.CellStyle = headerCellStyle;
                if (header.Value.Item1.Item1.Count > 1)
                {
                    curCol--;
                    curRow += header.Value.Item1.Item1.Count;
                }
            }
            
            curCol = 2;
            foreach (var data in info.Data)
            {
                curRow = 1;

                foreach (var header in info.Headers.Values)
                {
                    foreach (var item in header.Item1.Item1)
                    {
                        var property = typeof(T).GetProperty(item);
                        var cellValue = sheet.GetRow(curRow)?.CreateCell(curCol);
                        if (cellValue != null && property != null)
                        {
                            var value = property?.GetValue(data)?.ToString();
                            var rowHeight = GetRowHeight(item, info);
                            var currentRow = sheet.GetRow(curRow);
                            if (rowHeight != null)
                            {
                                currentRow.Height = (short)(rowHeight.Value * 20);
                            }
                            cellValue.SetCellValue(value);
                            cellValue.CellStyle = dataCellStyle;
                        }
                        curRow++;
                    }                   
                }
                curCol++;
            }          

            using var fs = new FileStream(info.FilePath, FileMode.Create, FileAccess.Write);
            workbook.Write(fs);
        }

        private static int? GetRowHeight<T>(string header, ExcelTableInfo<T> info) where T:class
        {
            foreach (var item in info.Headers)
            {
                foreach (var elem in item.Value.Item1.Item1)
                {
                    int id = item.Value.Item1.Item1.IndexOf(elem);
                    if (item.Value.Item1.Item1[id] == header)
                        return item.Value.Item2[id];
                }
            }
            return 0;
        }

        private static ICellStyle GetHeaderCellStyle(IWorkbook workbook)
        {
            var style = workbook.CreateCellStyle();
            style.BorderBottom = BorderStyle.Thin;
            style.BorderLeft = BorderStyle.Thin;
            style.BorderRight = BorderStyle.Thin;
            style.BorderTop = BorderStyle.Thin;

            var font = workbook.CreateFont();
            font.Boldweight = (short)FontBoldWeight.Bold;
            style.SetFont(font);
            style.Alignment = HorizontalAlignment.Center;
            style.VerticalAlignment = VerticalAlignment.Center;

            return style;
        }

        private static ICellStyle GetDataCellStyle(IWorkbook workbook)
        {
            var style = workbook.CreateCellStyle();
            style.BorderBottom = BorderStyle.Thin;
            style.BorderLeft = BorderStyle.Thin;
            style.BorderRight = BorderStyle.Thin;
            style.BorderTop = BorderStyle.Thin;

            return style;
        }        
    } 
    public class Property
    {
        public string? Name { get; set; }
    }
}