static IEnumerable<Transaction> ReadAllTransactionsFromDirectory(string directory)
{
var dataProviders = new ITransactionProvider[] {
new BoACreditCsvDataProvider(),
new BoADebitCsvDataProvider(),
new ChaseCreditCsvDataProvider()
};
var transactions = new List<Transaction>();
var fileUniqueness = new FileContentUniqueness();
foreach (var file in Directory.EnumerateFiles(directory, "*.csv"))
{
var fileContent = File.ReadAllText(file);
if (!fileUniqueness.IsUnique(fileContent))
{
throw new Exception($"{file} has same content as some other file");
}
var dataProvider = dataProviders.First(provider => provider.FormatSupported(fileContent));
transactions.AddRange(dataProvider.GetTransactions(fileContent));
}
return transactions;
}