using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Text;
using CsvHelper;
using CsvHelper.Configuration.Attributes;
using Ical.Net.CalendarComponents;
using Ical.Net.DataTypes;
using Ical.Net.Serialization;
using Microsoft.AspNetCore.Mvc.RazorPages;
using trainav.web.database;
using trainav.web.database.Tables;
using Calendar = Ical.Net.Calendar;

namespace trainav.web.Pages {
	public class GenIcs : PageModel {
		public     string    IcsOutput;
		public     List<Leg> Legs;
		public new string    User;

		public void OnGet() {
			using var db = new Database.DbConn();

			if (!db.Legs.Any(p => p.TripId == int.Parse(Request.Query["id"]))) {
				IcsOutput = "";
				return;
			}

			Legs = db.Legs.Where(p => p.TripId == int.Parse(Request.Query["id"])).OrderBy(p => p.DepTime).ToList();
			User = db.Users.First(p => p.UserId == Legs.First().UserId).Username;
			if (Request.Query["user"] != User) {
				IcsOutput = "";
				return;
			}

			List<Ds100object> ds100Mapping;

			using (var reader = new StreamReader("ds100.csv"))
			using (var csv = new CsvReader(reader, CultureInfo.InvariantCulture)) {
				csv.Configuration.Delimiter             = ";";
				csv.Configuration.Encoding              = Encoding.UTF8;
				csv.Configuration.PrepareHeaderForMatch = (header, index) => header.ToLower();
				ds100Mapping                            = csv.GetRecords<Ds100object>().ToList();
			}

			var calendar = new Calendar();
			foreach (var leg in Legs.Where(p => p.TrainType != "placeholder")) {
				var depst = ds100Mapping.Where(p => p.Station == leg.DepStation)
										.DefaultIfEmpty(new Ds100object {Station = leg.DepStation, Ds100 = leg.DepStation})
										.First()
										.Ds100;
				var arrst = ds100Mapping.Where(p => p.Station == leg.ArrStation)
										.DefaultIfEmpty(new Ds100object {Station = leg.ArrStation, Ds100 = leg.ArrStation})
										.First()
										.Ds100;
				var title = $"{depst} -> {arrst} ({leg.TrainType} {leg.TrainNr})";
				var e = new CalendarEvent {
					Summary = title, Start = new CalDateTime(DateTime.Parse(leg.DepTime)), End = new CalDateTime(DateTime.Parse(leg.ArrTime))
				};

				if (!string.IsNullOrWhiteSpace(leg.Comment))
					e.Description =
						leg.Comment
						+ "\n"
						+ "\n"
						+ $"https://marudor.de/details/{leg.TrainType}{leg.TrainNr}/{DateTime.Parse(leg.DepTime).ToUniversalTime().Subtract(new DateTime(1970, 1, 1)).TotalSeconds}000/?station={leg.DepStationId}";

				else
					e.Description = $"https://marudor.de/details/{leg.TrainType}{leg.TrainNr}/{DateTime.Parse(leg.DepTime).ToUniversalTime().Subtract(new DateTime(1970, 1, 1)).TotalSeconds}000/?station={leg.DepStationId}";

				calendar.Events.Add(e);
			}

			var serializer = new CalendarSerializer();
			IcsOutput = serializer.SerializeToString(calendar);
		}

		private class Ds100object {
			[Name("Bundesland")] public string Bundesland { get; set; }

			[Name("RB")] public string Regionalbereich { get; set; }

			[Name("BM")] public string Bahnhofsmanagement { get; set; }

			[Name("Bf. Nr.")] public string BfNr { get; set; }

			[Name("Station")] public string Station { get; set; }

			[Name("Bf DS 100Abk.")] public string Ds100 { get; set; }

			[Name("Kat. Vst")] public string Kategorie { get; set; }

			[Name("Straße")] public string Strasse { get; set; }

			[Name("PLZ")] public string Plz { get; set; }

			[Name("Ort")] public string Ort { get; set; }

			[Name("Aufgabenträger")] public string Verkehrsverbund { get; set; }
		}
	}
}