using QuestPDF.Fluent;
using QuestPDF.Helpers;
using QuestPDF.Infrastructure;
using System.IO;
using System.Collections.Generic;
using PSTW_CentralSystem.Areas.OTcalculate.Models;
using System;

namespace PSTW_CentralSystem.Areas.OTcalculate.Services
{
    public class OvertimePdfService
    {
    public MemoryStream GenerateOvertimeTablePdf(
    List<OtRegisterModel> records,
    int departmentId,
    string userFullName,
    string departmentName,
    byte[]? logoImage = null // Optional logo image
)
        {
            var stream = new MemoryStream();

            Document.Create(container =>
            {
                container.Page(page =>
                {
                    page.Size(PageSizes.A4.Landscape());
                    page.Margin(30);

                    // Header section with logo and user info
                    page.Content().Column(column =>
                    {
                        column.Item().Row(row =>
                        {
                            row.RelativeItem(2).Column(col =>
                            {


                                if (logoImage != null)
                                {
                                    col.Item().Container().Height(36).Image(logoImage, ImageScaling.FitArea);
                                    col.Spacing(10);
                                }

                                col.Item().Text($"Name: {userFullName}").FontSize(9).SemiBold();
                                col.Item().Text($"Department: {departmentName}").FontSize(9).Italic();
                            });

                            row.RelativeItem(1).AlignRight().Text($"Generated: {DateTime.Now:dd MMM yyyy HH:mm}")
                                .FontSize(9).FontColor(Colors.Grey.Medium);
                        });


                        column.Item().PaddingVertical(10).LineHorizontal(0.5f).LineColor(Colors.Grey.Lighten2);

                        // Table section
                        column.Item().Table(table =>
                        {
                            table.ColumnsDefinition(columns =>
                            {
                                columns.RelativeColumn(); // Date
                                columns.RelativeColumn(1); // Office From
                                columns.RelativeColumn(1); // Office To
                                columns.RelativeColumn(); // Office Break
                                columns.RelativeColumn(1); // Outside From
                                columns.RelativeColumn(1); // Outside To
                                columns.RelativeColumn(); // Outside Break
                                columns.RelativeColumn(); // Total OT
                                columns.RelativeColumn(1); // Break Hours
                                columns.RelativeColumn(); // Net OT
                                if (departmentId == 2)
                                    columns.RelativeColumn(); // Station
                                columns.RelativeColumn(1); // Day Type
                                columns.RelativeColumn(3); // Description
                            });

                            // Header Row
                            table.Header(header =>
                            {
                                header.Cell().Background("#d0ead2").Padding(5).Text("Date").FontSize(9).Bold().AlignCenter();
                                header.Cell().Background("#dceefb").Padding(5).Text("From\n(Office)").FontSize(9).Bold().AlignCenter();
                                header.Cell().Background("#dceefb").Padding(5).Text("To\n(Office)").FontSize(9).Bold().AlignCenter();
                                header.Cell().Background("#dceefb").Padding(5).Text("Break\n(Office)").FontSize(9).Bold().AlignCenter();
                                header.Cell().Background("#edf2f7").Padding(5).Text("From\n(Outside)").FontSize(9).Bold().AlignCenter();
                                header.Cell().Background("#edf2f7").Padding(5).Text("To\n(Outside)").FontSize(9).Bold().AlignCenter();
                                header.Cell().Background("#edf2f7").Padding(5).Text("Break\n(Outside)").FontSize(9).Bold().AlignCenter();
                                header.Cell().Background("#fdebd0").Padding(5).Text("Total OT\nHours").FontSize(9).Bold().AlignCenter();
                                header.Cell().Background("#fdebd0").Padding(5).Text("Break Hours\n(min)").FontSize(9).Bold().AlignCenter();
                                header.Cell().Background("#fdebd0").Padding(5).Text("Net OT").FontSize(9).Bold().AlignCenter();
                                if (departmentId == 2)
                                    header.Cell().Background("#d0f0ef").Padding(5).Text("Station").FontSize(9).Bold().AlignCenter();
                                header.Cell().Background("#e0f7da").Padding(5).Text("Days").FontSize(9).Bold().AlignCenter();
                                header.Cell().Background("#e3f2fd").Padding(5).Text("Description").FontSize(9).Bold().AlignCenter();
                            });

                            // Data Rows
                            double totalOTSum = 0;
                            int totalBreakSum = 0;
                            TimeSpan totalNetOt = TimeSpan.Zero;

                            foreach (var r in records)
                            {
                                var totalOT = CalculateTotalOT(r);
                                var totalBreak = (r.OfficeBreak ?? 0) + (r.OutsideBreak ?? 0);
                                var netOT = totalOT - TimeSpan.FromMinutes(totalBreak);

                                totalOTSum += totalOT.TotalHours;
                                totalBreakSum += totalBreak;
                                totalNetOt += netOT;

                                table.Cell().Padding(5).Text(r.OtDate.ToString("dd/MM/yyyy")).FontSize(9);
                                table.Cell().Padding(5).Text(FormatTime(r.OfficeFrom)).FontSize(9);
                                table.Cell().Padding(5).Text(FormatTime(r.OfficeTo)).FontSize(9);
                                table.Cell().Padding(5).Text($"{r.OfficeBreak ?? 0} min").FontSize(9);
                                table.Cell().Padding(5).Text(FormatTime(r.OutsideFrom)).FontSize(9);
                                table.Cell().Padding(5).Text(FormatTime(r.OutsideTo)).FontSize(9);
                                table.Cell().Padding(5).Text($"{r.OutsideBreak ?? 0} min").FontSize(9);
                                table.Cell().Padding(5).Text($"{totalOT.TotalHours:F2}").FontSize(9);
                                table.Cell().Padding(5).Text($"{totalBreak}").FontSize(9);
                                table.Cell().Padding(5).Text($"{netOT.Hours} hr {netOT.Minutes} min").FontSize(9);
                                if (departmentId == 2)
                                    table.Cell().Padding(5).Text(r.Stations?.StationName ?? "N/A").FontSize(9);
                                table.Cell().Padding(5).Text(r.OtDays).FontSize(9);
                                table.Cell().Padding(5).Text(r.OtDescription ?? "-").FontSize(9).WrapAnywhere().LineHeight(1.2f);
                            }

                            // Totals Row
                            table.Cell().ColumnSpan((uint)(departmentId == 2 ? 7 : 6)).Background("#d8d1f5").Padding(5).Text("TOTAL").Bold().FontSize(9);
                            table.Cell().Background("#d8d1f5").Padding(5).Text($"{totalOTSum:F2}").Bold().FontSize(9);
                            table.Cell().Background("#d8d1f5").Padding(5).Text($"{totalBreakSum}").Bold().FontSize(9);
                            table.Cell().Background("#d8d1f5").Padding(5).Text($"{(int)totalNetOt.TotalHours} hr {totalNetOt.Minutes} min").Bold().FontSize(9);
                            if (departmentId == 2)
                                table.Cell().Background("#d8d1f5");
                            table.Cell().Background("#d8d1f5");
                            table.Cell().Background("#d8d1f5");
                        });
                    });
                });
            }).GeneratePdf(stream);

            stream.Position = 0;
            return stream;
        }


        private TimeSpan CalculateTotalOT(OtRegisterModel r)
        {
            TimeSpan office = (r.OfficeTo ?? TimeSpan.Zero) - (r.OfficeFrom ?? TimeSpan.Zero);
            TimeSpan outside = (r.OutsideTo ?? TimeSpan.Zero) - (r.OutsideFrom ?? TimeSpan.Zero);

            if (outside < TimeSpan.Zero)
                outside += TimeSpan.FromHours(24);

            return office + outside;
        }

        private string FormatTime(TimeSpan? time)
        {
            return time?.ToString(@"hh\:mm") ?? "-";
        }

    }
}