namespace BankOperationsUpdate.WorkerService.OperationsUpdate;

public  class UpdateOperations
{
	private  IRepositoryWrapper _repositoryWrapper;
	private readonly ILogger<UpdateOperations> _logger;
	private readonly IServiceProvider _provider;

	public UpdateOperations(ILogger<UpdateOperations> logger, IServiceProvider provider)
	{
		_logger = logger;
		_provider = provider;
	}

	public void WhenStart()
	{
		using (var scope = _provider.CreateScope()) {
			_repositoryWrapper = scope.ServiceProvider.GetRequiredService<IRepositoryWrapper>();
			SetTransactionsInitial();
		}
		
	}

	public void Execute()
	{
		using (var scope = _provider.CreateScope()) {
			_repositoryWrapper = scope.ServiceProvider.GetRequiredService<IRepositoryWrapper>();
			AddConfirmedOperations();
		}

		using (var scope = _provider.CreateScope()) {
			_repositoryWrapper = scope.ServiceProvider.GetRequiredService<IRepositoryWrapper>();
			UpdateConfirmedTransactions();
		}
	}

	#region	Different Get methods
	public IQueryable<BankOperation> GetAllOperations() => _repositoryWrapper.BankOperation.GetAll();
	public IQueryable<BankOperation> GetAllConfirmedOperations() => _repositoryWrapper.BankOperation.GetAllConfirmed(Guid.Empty, Guid.Empty);
	public IQueryable<BankOperation> GetAllConfirmedOperations(Guid accountId, Guid businessId) => _repositoryWrapper.BankOperation.GetAllConfirmed(accountId, businessId);
	public IQueryable<BankOperation> GetAllNewOperations() => _repositoryWrapper.BankOperation.GetAllNew(Guid.Empty, Guid.Empty);
	public IQueryable<BankOperation> GetAllNewOperations(Guid accountId, Guid businessId) => _repositoryWrapper.BankOperation.GetAllNew(accountId, businessId);
	public IQueryable<BankAccountBalance> GetAllBankBalances() => _repositoryWrapper.BankAccountBalance.FindAll();
	public BankAccountBalance GetAccountBalanceByBusinessId(Guid accountId, Guid businessId) => 
		_repositoryWrapper.BankAccountBalance.GetByBankAccountId(accountId, businessId).FirstOrDefault();
	public IQueryable<Transaction> GetTransactionsByAccountId(Guid accountId, Guid businessId) => _repositoryWrapper.Transaction.GetByAccountId(accountId, businessId);
	public IQueryable<Transaction> GetAllTransactions() => _repositoryWrapper.Transaction.FindAll();
	public Transaction GetTransactionByOperationId(Guid operationId) => _repositoryWrapper.Transaction.GetByOperationId(operationId);
	#endregion



	void SetTransactionsInitial()
	{
		var bankBalances = GetAllBankBalances().ToList();
		decimal? currentBalance;

		for(int i = 0; i < bankBalances.Count; i++) {
			currentBalance = bankBalances[i].Amount;
			_logger.LogDebug("Process for account {0}", bankBalances[i].Id);
			SetTransactionsForAccount(currentBalance, bankBalances[i].BankAccountId.Value, bankBalances[i].BusinessId.Value);

		}
	}



	void AddConfirmedOperations()
	{
		var operations = GetAllConfirmedOperations().OrderBy(x => x.DocDate).ThenBy(x => x.CreatedDate).ToList();
		var newOperations = GetAllNewOperations().OrderBy(x => x.DocDate).ThenBy(x => x.CreatedDate).ToList();
		var transactiondHashSet = GetAllTransactions().Select(x => x.BankOperationId).ToHashSet();
		BankAccountBalance accountBalance;
		Transaction transaction;

		foreach (var item in operations) {

			if (!transactiondHashSet.Contains(item.Id)) {
				accountBalance = GetAccountBalanceByBusinessId(item.BankAccountId.Value, item.BusinessId.Value);
				accountBalance.Amount = accountBalance.Amount!.Value + item.IncomeAmount!.Value - item.OutcomeAmount!.Value;

				transaction = new Transaction {
					Id = Guid.NewGuid(),
					BankOperationId = item.Id,
					IncomeAmount = item.IncomeAmount,
					OutcomeAmount = item.OutcomeAmount,
					BalanceAmount = item.IncomeAmount!.Value - item.OutcomeAmount!.Value,
					ModifiedDate = item.DocDate,
					BusinessId = item.BusinessId.Value,
					BankAccountId = item.BankAccountId.Value,
					CreateDate = DateTime.Now,
					OperationCreateDate = item.CreatedDate!.Value,
					IsChanged = true,
				};

				_logger.LogInformation(Environment.NewLine + "Created new Transaction {0}", transaction.Id);
				_repositoryWrapper.Transaction.Create(transaction);
				_repositoryWrapper.BankAccountBalance.Update(accountBalance);
				_repositoryWrapper.Save();
				_repositoryWrapper.Transaction.Detach(transaction);
				_repositoryWrapper.BankAccountBalance.Detach(accountBalance);
			
			}
			else if(transactiondHashSet.Contains(item.Id) && item.IsChanged == true) {
				UpdateChangedOperations(item, true);
			}
		}

		foreach (var item in newOperations) {
			if (transactiondHashSet.Contains(item.Id)) {
				UpdateChangedOperations(item, false);
			}
		}
	}





	void UpdateChangedOperations(BankOperation operation, bool IsChanged)
	{
		Transaction transaction = GetTransactionByOperationId(operation.Id);
		var accountBalance = GetAccountBalanceByBusinessId(operation.BankAccountId.Value, operation.BusinessId.Value);
		decimal incomeDifference, outcomeDifference;

		if (!IsChanged) {

			incomeDifference = -1 * transaction.IncomeAmount.Value;
			outcomeDifference = -1 * transaction.OutcomeAmount.Value;
			_repositoryWrapper.Transaction.Delete(transaction);
		}
		else {
			incomeDifference = operation.IncomeAmount.Value - transaction.IncomeAmount.Value;
			outcomeDifference = operation.OutcomeAmount.Value - transaction.OutcomeAmount.Value;

			transaction.IncomeAmount += incomeDifference;
			transaction.OutcomeAmount += outcomeDifference;
			operation.IsChanged = false;

			_logger.LogInformation("Updated transaction with id: {0}", transaction.Id);
			_repositoryWrapper.Transaction.Update(transaction);
			_repositoryWrapper.BankOperation.Update(operation);

		}

		accountBalance.Amount = accountBalance.Amount + incomeDifference - outcomeDifference;
		_repositoryWrapper.BankAccountBalance.Update(accountBalance);
		_repositoryWrapper.Save();
		_repositoryWrapper.Transaction.Detach(transaction);

		var transactionsList = GetTransactionsByAccountId(operation.BankAccountId.Value, operation.BusinessId.Value).Where(x => x.BusinessId == operation.BusinessId && x.BankAccountId == operation.BankAccountId && DateTime.Compare(x.ModifiedDate.Value, transaction.ModifiedDate.Value) >= 0).OrderBy(x => x.ModifiedDate).ThenBy(x => x.OperationCreateDate).ToList();

		foreach(var item  in transactionsList) {
			item.BalanceAmount = item.BalanceAmount + incomeDifference - outcomeDifference;
			_logger.LogInformation("Updated transaction with id: {0}", transaction.Id);
			_repositoryWrapper.Transaction.Update(item);
			_repositoryWrapper.Save();
			_repositoryWrapper.Transaction.Detach(item);
		}

	}

	void UpdateConfirmedTransactions()
	{
		var bankAccounts = GetAllBankBalances().ToList();
		List<Transaction> transactions;
		decimal newValue = 0M;

		foreach (var account in bankAccounts) {
			transactions = GetTransactionsByAccountId(account.BankAccountId.Value, account.BusinessId.Value).OrderBy(x => x.ModifiedDate).ThenBy(x => x.OperationCreateDate).ToList();

			for (int i = 1; i < transactions.Count; i++) {
				if (transactions[i].IsChanged == true) {
					transactions[i].BalanceAmount += transactions[i - 1].BalanceAmount;
					newValue += transactions[i].IncomeAmount.Value - transactions[i].OutcomeAmount.Value;
					transactions[i].IsChanged = false;
				}
				else {
					transactions[i].BalanceAmount += newValue;
				}

				_repositoryWrapper.Transaction.Update(transactions[i]);
				_repositoryWrapper.Save();
			}
		}
	}

	void SetTransactionsForAccount(decimal? balance, Guid accountId, Guid businessId)
	{
		var operations =  GetAllConfirmedOperations(accountId, businessId).OrderBy(x => x.DocDate).ToList();
		var transactionsHashSet = GetTransactionsByAccountId(accountId, businessId).Select(x => x.BankOperationId).ToHashSet();
		Transaction transaction = new Transaction();
		var currentBalance = GetTransactionsByAccountId(accountId, businessId).Sum(x => (x.IncomeAmount - x.OutcomeAmount));
											   

		for (int i = 0; i < operations.Count; i++) {

			if (!transactionsHashSet.Contains(operations[i].Id)) {
				currentBalance = currentBalance + operations[i].IncomeAmount!.Value - operations[i].OutcomeAmount!.Value;

				transaction.Id = Guid.NewGuid();
				transaction.IncomeAmount = operations[i].IncomeAmount;
				transaction.OutcomeAmount = operations[i].OutcomeAmount;
				transaction.BankOperationId = operations[i].Id;
				transaction.IsChanged = false;
				transaction.ModifiedDate = operations[i].DocDate;
				transaction.BusinessId = businessId;
				transaction.BankAccountId = accountId;
				transaction.BalanceAmount = currentBalance??0;

				_repositoryWrapper.Transaction.Create(transaction);
				_repositoryWrapper.Save();
			}
		}

		_logger.LogInformation($"{operations.Count} count records was written");

	}





}