using ClosedXML.Excel;
using TrafagSalesExporter.Models;

namespace TrafagSalesExporter.Services;

public class ExcelExportService : IExcelExportService
{
    public string CreateExcelFile(string outputDirectory, string tsc, DateTime fileDate, List<SalesRecord> records)
    {
        Directory.CreateDirectory(outputDirectory);
        var fileName = $"Sales_{tsc}_{fileDate:yyyy-MM-dd}.xlsx";
        var fullPath = Path.Combine(outputDirectory, fileName);
        WriteWorkbook(fullPath, records);
        return fullPath;
    }

    public string CreateConsolidatedExcelFile(string outputDirectory, DateTime fileDate, List<SalesRecord> records)
    {
        Directory.CreateDirectory(outputDirectory);
        var fileName = $"Sales_All_{fileDate:yyyy-MM-dd}.xlsx";
        var fullPath = Path.Combine(outputDirectory, fileName);
        WriteWorkbook(fullPath, records);
        return fullPath;
    }

    public string CreateGenericExcelFile(string outputDirectory, string filePrefix, DateTime fileDate, string worksheetName, IReadOnlyList<IReadOnlyDictionary<string, object?>> rows)
    {
        Directory.CreateDirectory(outputDirectory);
        var safePrefix = string.IsNullOrWhiteSpace(filePrefix) ? "Export" : filePrefix.Trim();
        var fileName = $"{safePrefix}_{fileDate:yyyy-MM-dd}.xlsx";
        var fullPath = Path.Combine(outputDirectory, fileName);
        WriteGenericWorkbook(fullPath, worksheetName, rows);
        return fullPath;
    }

    private static void WriteWorkbook(string fullPath, List<SalesRecord> records)
    {
        using var workbook = new XLWorkbook();
        var ws = workbook.Worksheets.Add("Sales");

        var headers = new[]
        {
            "extraction date",
            "TSC",
            "Document Entry",
            "Invoice Number",
            "Position on invoice",
            "Material",
            "Name",
            "Product Group",
            "Quantity",
            "Supplier number",
            "Supplier name",
            "Supplier country",
            "Customer number",
            "Customer name",
            "Customer country",
            "Customer Industry",
            "Standard cost",
            "Standard Cost Currency",
            "Purchase Order number",
            "Sales Price/Value",
            "Sales Currency",
            "Document Currency",
            "Document Total FC",
            "Document Total LC",
            "VAT Sum FC",
            "VAT Sum LC",
            "Document Rate",
            "Company Currency",
            "Incoterms 2020",
            "Sales responsible employee",
            "invoice date",
            "order date",
            "Land",
            "Document Type"
        };

        for (var i = 0; i < headers.Length; i++)
        {
            ws.Cell(1, i + 1).Value = headers[i];
            ws.Cell(1, i + 1).Style.Font.Bold = true;
        }

        var row = 2;
        foreach (var record in records)
        {
            ws.Cell(row, 1).Value = record.ExtractionDate.ToString("dd.MM.yyyy HH:mm:ss");
            ws.Cell(row, 2).Value = record.Tsc;
            ws.Cell(row, 3).Value = record.DocumentEntry;
            ws.Cell(row, 4).Value = record.InvoiceNumber;
            ws.Cell(row, 5).Value = record.PositionOnInvoice;
            ws.Cell(row, 6).Value = record.Material;
            ws.Cell(row, 7).Value = record.Name;
            ws.Cell(row, 8).Value = record.ProductGroup;
            ws.Cell(row, 9).Value = record.Quantity;
            ws.Cell(row, 10).Value = record.SupplierNumber;
            ws.Cell(row, 11).Value = record.SupplierName;
            ws.Cell(row, 12).Value = record.SupplierCountry;
            ws.Cell(row, 13).Value = record.CustomerNumber;
            ws.Cell(row, 14).Value = record.CustomerName;
            ws.Cell(row, 15).Value = record.CustomerCountry;
            ws.Cell(row, 16).Value = record.CustomerIndustry;
            ws.Cell(row, 17).Value = record.StandardCost;
            ws.Cell(row, 18).Value = record.StandardCostCurrency;
            ws.Cell(row, 19).Value = record.PurchaseOrderNumber;
            ws.Cell(row, 20).Value = record.SalesPriceValue;
            ws.Cell(row, 21).Value = record.SalesCurrency;
            ws.Cell(row, 22).Value = record.DocumentCurrency;
            ws.Cell(row, 23).Value = record.DocumentTotalForeignCurrency;
            ws.Cell(row, 24).Value = record.DocumentTotalLocalCurrency;
            ws.Cell(row, 25).Value = record.VatSumForeignCurrency;
            ws.Cell(row, 26).Value = record.VatSumLocalCurrency;
            ws.Cell(row, 27).Value = record.DocumentRate;
            ws.Cell(row, 28).Value = record.CompanyCurrency;
            ws.Cell(row, 29).Value = record.Incoterms2020;
            ws.Cell(row, 30).Value = record.SalesResponsibleEmployee;
            ws.Cell(row, 31).Value = record.InvoiceDate?.ToString("dd.MM.yyyy") ?? string.Empty;
            ws.Cell(row, 32).Value = record.OrderDate?.ToString("dd.MM.yyyy") ?? string.Empty;
            ws.Cell(row, 33).Value = record.Land;
            ws.Cell(row, 34).Value = record.DocumentType;
            row++;
        }

        ws.Columns().AdjustToContents();
        workbook.SaveAs(fullPath);
    }

    private static void WriteGenericWorkbook(string fullPath, string worksheetName, IReadOnlyList<IReadOnlyDictionary<string, object?>> rows)
    {
        using var workbook = new XLWorkbook();
        var sheetName = string.IsNullOrWhiteSpace(worksheetName) ? "Export" : worksheetName.Trim();
        var ws = workbook.Worksheets.Add(sheetName.Length > 31 ? sheetName[..31] : sheetName);

        var headers = rows
            .SelectMany(r => r.Keys)
            .Distinct(StringComparer.OrdinalIgnoreCase)
            .ToList();

        for (var i = 0; i < headers.Count; i++)
        {
            ws.Cell(1, i + 1).Value = headers[i];
            ws.Cell(1, i + 1).Style.Font.Bold = true;
        }

        for (var rowIndex = 0; rowIndex < rows.Count; rowIndex++)
        {
            var row = rows[rowIndex];
            for (var colIndex = 0; colIndex < headers.Count; colIndex++)
            {
                row.TryGetValue(headers[colIndex], out var value);
                ws.Cell(rowIndex + 2, colIndex + 1).Value = value?.ToString() ?? string.Empty;
            }
        }

        ws.Columns().AdjustToContents();
        workbook.SaveAs(fullPath);
    }
}