namespace MoneyMap.Models.Import
{
    /// <summary>
    /// Result of an import operation, showing counts of processed transactions.
    /// </summary>
    public record ImportResult(int Total, int Inserted, int Skipped, string? Last4FromFile);

    /// <summary>
    /// Wrapper for import operation result with success/failure state.
    /// </summary>
    public class ImportOperationResult
    {
        public bool IsSuccess { get; init; }
        public ImportResult? Data { get; init; }
        public string? ErrorMessage { get; init; }

        public static ImportOperationResult Success(ImportResult data) =>
            new() { IsSuccess = true, Data = data };

        public static ImportOperationResult Failure(string error) =>
            new() { IsSuccess = false, ErrorMessage = error };
    }

    /// <summary>
    /// Wrapper for preview operation result with success/failure state.
    /// </summary>
    public class PreviewOperationResult
    {
        public bool IsSuccess { get; init; }
        public List<TransactionPreview>? Data { get; init; }
        public string? ErrorMessage { get; init; }

        public static PreviewOperationResult Success(List<TransactionPreview> data) =>
            new() { IsSuccess = true, Data = data };

        public static PreviewOperationResult Failure(string error) =>
            new() { IsSuccess = false, ErrorMessage = error };
    }

    /// <summary>
    /// Preview of a transaction before import, with duplicate detection info.
    /// </summary>
    public class TransactionPreview
    {
        public required Transaction Transaction { get; init; }
        public bool IsDuplicate { get; init; }
        public required string PaymentMethodLabel { get; init; }
        public string? SuggestedCategory { get; set; }
    }

    /// <summary>
    /// User's selection for payment method during import confirmation.
    /// </summary>
    public class PaymentSelection
    {
        public int? AccountId { get; set; }
        public int? CardId { get; set; }
        public string? Category { get; set; }
    }

    /// <summary>
    /// Key for detecting duplicate transactions.
    /// </summary>
    public record TransactionKey(DateTime Date, decimal Amount, string Name, string Memo, int AccountId, int? CardId)
    {
        public TransactionKey(Transaction txn)
            : this(txn.Date, txn.Amount, txn.Name, txn.Memo, txn.AccountId, txn.CardId) { }
    }
}