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 3 (LKAS 1) - retrofit 2026-07-31, classified
    // presentation (Non-Current/Current split) driven by BalanceSheetReportDto's sections,
    // rather than the old rollup-by-depth-1 grouping. Each section is already leaf rows + a
    // server-computed Total (Accounting_System_Design_LKAS.md Section 11.3), so the renderer
    // just lists lines and prints the given totals - no rendering-layer arithmetic.
    public class BalanceSheetPdfDocument(string companyName, string currencyCode, DateOnly asOfDate, BalanceSheetReportDto data) : 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, "Statement of Financial Position", ReportPageHeader.PointInTimePeriodLine(asOfDate), currencyCode);

                page.Content().PaddingTop(10).Column(column =>
                {
                    void RenderSection(string title, BalanceSheetSectionDto section, string totalLabel)
                    {
                        if (section.Lines.Count == 0) return;

                        column.Item().PaddingTop(8).Text(title).Bold();
                        foreach (var line in section.Lines)
                        {
                            column.Item().Row(r =>
                            {
                                r.RelativeItem(4).Text(line.AccountName).FontFamily(Fonts.Consolas);
                                r.RelativeItem(1).AlignRight().Text(PdfFormatting.FormatAmount(line.Balance));
                            });
                        }
                        column.Item().PaddingTop(2).LineHorizontal(0.75f);
                        column.Item().Row(r =>
                        {
                            r.RelativeItem(4).Text(totalLabel).Bold();
                            r.RelativeItem(1).AlignRight().Text(PdfFormatting.FormatAmount(section.Total)).Bold();
                        });
                    }

                    column.Item().Text("ASSETS").Bold().FontSize(12);
                    RenderSection("Non-Current Assets", data.NonCurrentAssets, "Total Non-Current Assets");
                    RenderSection("Current Assets", data.CurrentAssets, "Total Current Assets");
                    RenderSection("Unclassified Assets", data.UnclassifiedAssets, "Total Unclassified Assets");

                    column.Item().PaddingTop(3).LineHorizontal(1.5f);
                    column.Item().Row(r =>
                    {
                        r.RelativeItem(4).Text("TOTAL ASSETS").Bold();
                        r.RelativeItem(1).AlignRight().Text(PdfFormatting.FormatAmount(data.TotalAssets)).Bold();
                    });

                    column.Item().PaddingTop(15).Text("EQUITY AND LIABILITIES").Bold().FontSize(12);
                    RenderSection("Equity", data.Equity, "Total Equity");
                    RenderSection("Non-Current Liabilities", data.NonCurrentLiabilities, "Total Non-Current Liabilities");
                    RenderSection("Current Liabilities", data.CurrentLiabilities, "Total Current Liabilities");
                    RenderSection("Unclassified Liabilities", data.UnclassifiedLiabilities, "Total Unclassified Liabilities");

                    column.Item().PaddingTop(3).LineHorizontal(1.5f);
                    column.Item().Row(r =>
                    {
                        r.RelativeItem(4).Text("TOTAL EQUITY AND LIABILITIES").Bold();
                        r.RelativeItem(1).AlignRight().Text(PdfFormatting.FormatAmount(data.TotalEquityAndLiabilities)).Bold();
                    });
                });
            });
        }
    }
}