using System.Collections.Concurrent;


using ServerBase;
using ServerCommon;
using MetaAssets;


public class BrokerMetaTable
{
	public string Version { get; private set; }
	private readonly MetaTable m_meta_table = new MetaTable();

	public ProductMetaTable ProductMetaTable => m_meta_table.ProductMetaTable;

	// TODO: PlanetItemExchangePolicyMetaTable를 PlanetItemExchangePolicyTable로 이름 변경
	public PlanetItemExchangePolicyMetaTable PlanetItemExchangePolicyMetaTable => m_meta_table.PlanetItemExchangePolicyMetaTable;
	public SystemMailMetaTable SystemMailMetaTable => m_meta_table.SystemMailMetaTable;
	public ItemMetaTable ItemMetaTable => m_meta_table.ItemMetaTable;
	public TextStringMetaTable TextStringMetaTable => m_meta_table.TextStringMetaTable;

	public BrokerMetaTable(MetaTable? source = null, string? versionName = null)
	{
		if (source != null)
		{
			m_meta_table = source;
			Version = versionName ?? Guid.NewGuid().ToString();
		}
	}
}

public class BrokerApiMetaLoader : IDisposable
{
	readonly string m_input_path = "resource/meta";

	// 스레드 세이프한 딕셔너리로 변경
	private readonly ConcurrentDictionary<string, BrokerMetaTable> m_meta_tables =
		new ConcurrentDictionary<string, BrokerMetaTable>();

	// 더 세밀한 제어가 필요한 경우를 위한 ReaderWriterLockSlim 추가
	private readonly ReaderWriterLockSlim m_lock = new ReaderWriterLockSlim();

	// 기본 메타테이블 캐싱
	private BrokerMetaTable m_default_meta_table;

	public Result load(string? dataPath = null)
	{
		try
		{
			m_lock.EnterWriteLock();

			// 기본 메타 테이블 로드
			var (result, meta_table) = loadMetaData(dataPath);
			if (result.isFail() || meta_table == null)
			{
				return result;
			}

			if (m_meta_tables.TryAdd(meta_table.Version, meta_table))
			{
				m_default_meta_table = meta_table;
			}
			return result;
		}
		finally
		{
			m_lock.ExitWriteLock();
		}
	}

	private (Result, BrokerMetaTable?) loadMetaData(string? dataPath = null, string? versionName = null)
	{
		var result = new Result();
		var input_path = dataPath ?? m_input_path;
		try
		{
			var full_path = Path.GetFullPath(input_path, Environment.CurrentDirectory);
			if (!Directory.Exists(full_path))
			{
				full_path = Path.GetFullPath(input_path, AppContext.BaseDirectory);
				if (!Directory.Exists(full_path))
				{
					result.setFail(ServerErrorCode.MetaDataLoadFailed, $"Meta data path not found: {input_path}");
					return (result, null);
				}
			}

			var meta_table = new MetaTable();
			meta_table.loadForBrokerApi(full_path);

			var errors = new ValidatorErrorCollection();
			foreach (var data in meta_table.PlanetItemExchangePolicyMetaTable.PlanetItemExchangePolicyDataList)
			{
				validate(data, meta_table, errors);
			}
			if (errors.HasError)
			{
				errors.log();
			}

			//TODO: ProductMetaTable, SystemMailMetaTable, ItemMetaTable 에 대한 검사도 필요하다.
			var broker_meta_table = new BrokerMetaTable(meta_table, versionName);
			return (result, broker_meta_table);
		}
		catch (Exception ex)
		{
			result.setFail(ServerErrorCode.MetaDataLoadFailed, $"Meta data load failed => {ex.Message}");
		}

		return (result, null);
	}

	public BrokerMetaTable getMetaTable(string? versionName = null!)
	{
		try
		{
			m_lock.EnterReadLock();

			if (string.IsNullOrEmpty(versionName) || versionName == "default")
			{
				return m_default_meta_table;
			}

			return m_meta_tables.GetValueOrDefault(versionName, m_default_meta_table);

			// 요청된 버전이 없으면 기본 메타테이블 반환
		}
		finally
		{
			m_lock.ExitReadLock();
		}
	}

	private ValidatorErrorCollection validate(PlanetItemExchangePolicyMetaData planetItemExchange, MetaTable metaTable, ValidatorErrorCollection errors)
	{
		checkValidCaliverseItem(planetItemExchange);
		checkValidPlanetItem(planetItemExchange);
		return errors;

		void checkValidPlanetItem(PlanetItemExchangePolicyMetaData data)
		{
			var planet_item_type = toEnum(data.PlanetItemType, PlanetItemType.None);
			switch (planet_item_type)
			{
				case PlanetItemType.Igm26Currency:
				{
					var currency_type = toEnum(data.PlanetItemId, PlanetCurrencyType.None);
					if (currency_type == PlanetCurrencyType.None)
					{
						addError(nameof(data.PlanetItemId),
							$"Planet 화폐 타입이 잘못되었습니다 => PlanetItemId:{data.PlanetItemId}");
					}

					// if (data.PlanetItemAmount >= 0)
					// {
					//     // 재화는 차감만 가능
					//     addError(nameof(data.PlanetItemAmount),
					//         $"Planet 화폐 수량은 양수 합니다 => PlanetItemAmount:{data.PlanetItemAmount}");
					// }

					break;
				}
				case PlanetItemType.Igm26Quest:
					break;
				case PlanetItemType.None:
				default:
					addError(nameof(data.PlanetItemId),
						$"Planet 화폐 타입이 잘못되었습니다 => PlanetItemId:{data.PlanetItemId}");
					break;
			}
		}

		void checkValidCaliverseItem(PlanetItemExchangePolicyMetaData data)
		{
			var caliverse_item_type = toEnum(data.CaliverseItemType, CaliverseItemType.None);
			switch (caliverse_item_type)
			{
				case CaliverseItemType.Currency:
				{
					var currency_type = toEnum(data.CaliverseItemId, CurrencyType.None);
					if (currency_type == CurrencyType.None)
					{
						addError(nameof(data.CaliverseItemId),
							$"Caliverse 화폐 타입이 잘못되었습니다 => CaliverseItemId:{data.CaliverseItemId}");
					}

					// if (data.CaliverseItemAmount >= 0)
					// {
					//     // 재화는 차감만 가능
					//     addError(nameof(data.CaliverseItemAmount),
					//         $"Caliverse 화폐 수량은 음수여야 합니다 => CaliverseItemAmount:{data.CaliverseItemAmount}");
					// }

					break;
				}
				case CaliverseItemType.CaliverseProduct:
				{
					var product_id = Convert.ToInt32(data.CaliverseItemId);
					if (metaTable.ProductMetaTable.ProductMetaDataListbyId.ContainsKey(product_id) == false)
					{
						addError(nameof(data.CaliverseItemId),
							$"CaliverseItemId이 존재하지 않습니다 => CaliverseItemId: {data.CaliverseItemId}");
					}

					if (data.CaliverseItemAmount < 0)
					{
						addError(nameof(data.CaliverseItemAmount),
							$"Product 수량은 0보다 커야합니다 => CaliverseItemAmount:{data.CaliverseItemAmount}");
					}

					break;
				}
				case CaliverseItemType.None:
				default:
				{
					addError(nameof(data.CaliverseItemType),
						$"Caliverse 아이템 타입이 잘못되었습니다 => CaliverseItemType:{data.CaliverseItemType}");
					break;
				}
			}
		}

		void addError(string variableName, string msg)
		{
			errors.add($"Invalid PlanetItemExchangePolicyMetaData Value: {variableName} - {msg}");
		}

		TEnum toEnum<TEnum>(string enumTypeString, TEnum defaultValue) where TEnum : struct, Enum
		{
			var enum_type_string_result = enumTypeString.Replace("_", "");
			return Enum.TryParse<TEnum>(enum_type_string_result, ignoreCase: true, out var enum_type)
				? enum_type
				: defaultValue;
		}
	}

	// 리소스 해제를 위한 Dispose 패턴 구현
	private bool m_disposed = false;

	public void Dispose()
	{
		if (!m_disposed)
		{
			m_lock.Dispose();
			m_disposed = true;
		}
	}
}

// 최신 메타테이블을 참조하는 클래스
public class BrokerMetaTableRef
{
	public BrokerMetaTable MetaTable => m_meta_table;
	private readonly BrokerMetaTable m_meta_table;

	public BrokerMetaTableRef(BrokerMetaTable metaTable)
	{
		m_meta_table = metaTable;
	}
}