using System;
using System.Globalization;
using System.Text.RegularExpressions;
using System.Collections.Generic;
using System.Text.Json;
using System.Text.Json.Serialization;
using CsvHelper.Configuration.Attributes;

namespace Buypeeb {
	class YahooAuctionsItem {
		[JsonIgnore]
		public string url {
			get {
				return $"https://page.auctions.yahoo.co.jp/jp/auction/{this.id}";
			}
		}

		[JsonIgnore]
		public string buyeeUrl {
			get {
				return $"https://buyee.jp/item/yahoo/auction/{this.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
		[Ignore]
		public string id { get; set; }
		public string name { get; set; }
		private int price = 0;
		public int winPrice;
		public string originalName { get; set; }
		public string notes { get; set; }
		public bool favourite { get; set; } = false;
		public DateTime startDate;
		public DateTime endDate { get; set; }
		public DateTime lastUpdated;
		public int bids;
		public bool autoExtension;
		public bool ready;
		public bool available;

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

		[JsonIgnore]
		public string priceJPY { get { return $"¥{this.price}"; } }
		[JsonIgnore]
		public string winPriceJPY { get { return $"¥{this.winPrice}"; } }
		[Ignore, JsonIgnore]
		public string priceAUD { get { return $"${(this.price / 75.0):f2}"; } }
		[Ignore, JsonIgnore]
		public string winPriceAUD { get { return $"${(this.winPrice / 75.0):f2}"; } }
		[Ignore, JsonIgnore]
		public bool endingToday { get { return this.endDate.DayOfYear == DateTime.UtcNow.DayOfYear; } }
		[Ignore, JsonIgnore]
		public bool hasWinPrice { get { return this.winPrice != 0; } }
		[Ignore, JsonIgnore]
		public bool endingSoon { get { return DateTime.Compare(DateTime.UtcNow.AddMinutes(10), this.endDate) > 0; } }
		private bool success { get; set; } // TODO: custom setter that throws an exception if set to false or something idk

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

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

		public void Update(string html) {
			// TODO: handle all the parsing errors and weird interpretation that could possibly happen here
			var rx = new Regex(@"var pageData ?= ?(\{.+?\});", RegexOptions.Singleline); // TODO: maybe compile and match the regex in another thread
			var m = rx.Match(html);
			if (m == null) {
				Console.WriteLine("no sir i don't like it");
				return;
			}

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

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

			var j = j_full["items"];
			this.originalName = j["productName"];
			this.startDate = TimeZoneInfo.ConvertTimeToUtc(DateTime.ParseExact(j["starttime"], "yyyy-MM-dd HH:mm:ss", CultureInfo.InvariantCulture), jst);
			this.endDate = TimeZoneInfo.ConvertTimeToUtc(DateTime.ParseExact(j["endtime"], "yyyy-MM-dd HH:mm:ss", CultureInfo.InvariantCulture), jst);
			this.lastUpdated = DateTime.UtcNow;
			this.available = j["isClosed"] == "0";

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

			if (String.IsNullOrWhiteSpace(this.name)) {
				this.name = this.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* 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").
			var autoExtensionCheck = new Regex(@"自動延長.+\n.+>(.+)<");
			m = rx.Match(html);
			if (m.Groups[1].Value != null) {
				this.autoExtension = (m.Groups[1].Value == "あり");
			}
		}

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