using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.Text.Json;
using System.Text.Json.Serialization;
using System.Text.RegularExpressions;
using CsvHelper.Configuration.Attributes;
// ReSharper disable MemberCanBePrivate.Global

namespace Buypeeb {
	internal class YahooAuctionsItem {
		public bool AutoExtension;
		public bool Available;
		public int Bids;
		public DateTime LastUpdated;
		public int Price;
		public bool Ready;
		public DateTime StartDate;
		public bool UpdateFailed;
		public int WinPrice;

		public YahooAuctionsItem(string id, string name) {
			this.id = id;
			this.name = name;
		}

		public YahooAuctionsItem() {
			// parameterless constructor for deserialisation
		}

		[JsonIgnore] public string url => $"https://page.auctions.yahoo.co.jp/jp/auction/{id}";

		[JsonIgnore] public string buyeeUrl => $"https://buyee.jp/item/yahoo/auction/{id}";

		// any items with a getter will be saved to userdata.json
		// anything that's configurable by the user, such as the custom name, should be saved
		// the id *must* be saved!
		// i'm also saving the original name to make it easier to tell what the items are in the userdata.json
		// there's not really a need for it i guess but it's my program and i can do what i want
		// anything with the attribute [Ignore] won't be put in the CSV, and things with [JsonIgnore] won't be put in
		// userdata.json

		// don't remove ID's set attribute - JSON deserialisation will silently fail to assign IDs to the auction items!
		// you also don't want to private any of the setters, which will have a similar effect.
		[Ignore] public string id { get; set; }
		public string name { get; set; }
		public string originalName { get; set; }
		public string notes { get; set; }
		public bool favourite { get; set; }
		public DateTime endDate { get; set; }

		[Ignore]
		[JsonIgnore]
		public bool updatedRecently {
			get {
				var later = LastUpdated.AddSeconds(15);
				return DateTime.Compare(later, LastUpdated) < 0;
			}
		}

		[JsonIgnore] public string priceJpy => $"¥{Price}";

		[JsonIgnore] public string winPriceJpy => $"¥{WinPrice}";

		[Ignore] [JsonIgnore] public string priceAud => $"${Price / 75.0:f2}";

		[Ignore] [JsonIgnore] public string winPriceAud => $"${WinPrice / 75.0:f2}";

		[Ignore] [JsonIgnore] public bool endingToday => endDate.DayOfYear == DateTime.UtcNow.DayOfYear;

		[Ignore] [JsonIgnore] public bool hasWinPrice => WinPrice != 0;

		[Ignore] [JsonIgnore] public bool endingSoon => DateTime.Compare(DateTime.UtcNow.AddMinutes(10), endDate) > 0;

		private bool success { get; set; } // TODO: custom setter that throws an exception if set to false or something idk

		public void AuctionEnded() {
			// the page 404'd. this probably means that the auction has ended, and the page has been removed.
			Available = false;
			LastUpdated = DateTime.UtcNow;
			UpdateFailed = true;
		}

		public void Update(string html) {
			// TODO: handle all the parsing errors and weird interpretation that could possibly happen here
			// TODO: maybe compile and match the regex in another thread
			var rx = new Regex(@"var pageData ?= ?(\{.+?\});", RegexOptions.Singleline);
			var m = rx.Match(html);

			Dictionary<string, Dictionary<string, string>> jFull;
			try {
				// master forgive me, but i must go all out, just this once...
				jFull = JsonSerializer.Deserialize<Dictionary<string, Dictionary<string, string>>>(m.Groups[1].Value);
			} catch {
				Console.WriteLine("oh jeez oh man oh jeez oh man oh jeez oh man");
				Console.WriteLine(m.Groups[1].Value);
				throw;
			}

			var jst = TimeZoneInfo.CreateCustomTimeZone("JST", new TimeSpan(9, 0, 0), "Japan Standard Time",
				"Japan Standard Time");

			Debug.Assert(jFull != null, nameof(jFull) + " != null");
			var j = jFull["items"];
			originalName = j["productName"];
			StartDate = TimeZoneInfo.ConvertTimeToUtc(
				DateTime.ParseExact(j["starttime"], "yyyy-MM-dd HH:mm:ss", CultureInfo.InvariantCulture), jst);
			endDate = TimeZoneInfo.ConvertTimeToUtc(
				DateTime.ParseExact(j["endtime"], "yyyy-MM-dd HH:mm:ss", CultureInfo.InvariantCulture), jst);
			LastUpdated = DateTime.UtcNow;
			Available = j["isClosed"] == "0";

			success = int.TryParse(j["price"], out Price);
			success = int.TryParse(j["winPrice"], out WinPrice);
			success = int.TryParse(j["bids"], out Bids);

			if (string.IsNullOrWhiteSpace(name)) {
				name = originalName;
			}

			// as far as i can tell, neither the `pageData` nor the `conf` variables in the html seem to store whether or not
			// the auction uses automatic extension, the `conf` variable *does*, however, store whether or not the auction
			// has the "early end" feature enabled, in the key `earlyed`. unfortunately, it seems like the only way to get the
			// auto extension info is to scrape the page for the info column that displays the auto ext status and check
			// whether or not it's equal to "ari" (japanese for "yes").
			rx = new Regex(@"自動延長.+\n.+>(.+)<");
			m = rx.Match(html);
			AutoExtension = m.Groups[1].Value == "あり";

			UpdateFailed = false;
		}

		public override string ToString() {
			return $"{id}: {name}";
		}
	}
}