using General_Ledger_Service.DTOs.Reports;
using QuestPDF.Fluent;
using QuestPDF.Helpers;
using QuestPDF.Infrastructure;

namespace General_Ledger_Service.Services.PdfDocuments
{
    // 05_LKAS_Report_PDF_Templates.md Section 7 - not an LKAS statement, a management report.
    // Flat table including a Period column, since a budget can span multiple periods (Section 7's
    // own open question - grouping by period is a possible future enhancement, not required here).
    public class BudgetVsActualPdfDocument(string companyName, string currencyCode, long budgetId, List<BudgetVsActualRowDto> rows) : IDocument
    {
        public DocumentMetadata GetMetadata() => DocumentMetadata.Default;

        public void Compose(IDocumentContainer container)
        {
            container.Page(page =>
            {
                page.Size(PageSizes.A4);
                page.Margin(2, Unit.Centimetre);
                ReportPageHeader.Compose(page, companyName, "Budget vs Actual Report", $"Budget ID: {budgetId}", currencyCode);

                page.Content().PaddingTop(10).Table(table =>
                {
                    table.ColumnsDefinition(columns =>
                    {
                        columns.RelativeColumn(2);
                        columns.RelativeColumn(4);
                        columns.RelativeColumn(1);
                        columns.RelativeColumn(2);
                        columns.RelativeColumn(2);
                        columns.RelativeColumn(2);
                    });

                    table.Header(header =>
                    {
                        header.Cell().Text("Account Code").Bold();
                        header.Cell().Text("Account Name").Bold();
                        header.Cell().AlignRight().Text("Period").Bold();
                        header.Cell().AlignRight().Text("Budgeted").Bold();
                        header.Cell().AlignRight().Text("Actual").Bold();
                        header.Cell().AlignRight().Text("Variance").Bold();
                        header.Cell().ColumnSpan(6).PaddingTop(3).LineHorizontal(1);
                    });

                    foreach (var row in rows.OrderBy(r => r.PeriodId).ThenBy(r => r.AccountCode))
                    {
                        table.Cell().Text(row.AccountCode);
                        table.Cell().Text(row.AccountName);
                        table.Cell().AlignRight().Text(row.PeriodId.ToString());
                        table.Cell().AlignRight().Text(PdfFormatting.FormatAmount(row.BudgetedAmount));
                        table.Cell().AlignRight().Text(PdfFormatting.FormatAmount(row.ActualAmount));
                        table.Cell().AlignRight().Text(PdfFormatting.FormatAmount(row.Variance));
                    }

                    table.Cell().ColumnSpan(6).PaddingTop(3).LineHorizontal(1);
                    table.Cell().Text("");
                    table.Cell().Text("Total").Bold();
                    table.Cell().Text("");
                    table.Cell().AlignRight().Text(PdfFormatting.FormatAmount(rows.Sum(r => r.BudgetedAmount))).Bold();
                    table.Cell().AlignRight().Text(PdfFormatting.FormatAmount(rows.Sum(r => r.ActualAmount))).Bold();
                    table.Cell().AlignRight().Text(PdfFormatting.FormatAmount(rows.Sum(r => r.Variance))).Bold();
                });
            });
        }
    }
}