// DTOs
public class UserWalletDto
{
    public Guid Id { get; set; }
    public Guid UserId { get; set; }
    public string WalletAddress { get; set; }
    public decimal Balance { get; set; }
}

public class DatasetDto
{
    public Guid Id { get; set; }
    public Guid OwnerId { get; set; }
    public string Name { get; set; }
    public string? Description { get; set; }
    public Guid? DatasetTypeId { get; set; }
    public string? Type { get; set; }            // Joined from DatasetType
    public string? TypeMachineName { get; set; }
    public string? SourceInfo { get; set; }       // JSON metadata
    public decimal? QualityScore { get; set; }
    public DateTime Created { get; set; }
    public DateTime? Changed { get; set; }
}

public class CreateDatasetDto
{
    public Guid OwnerId { get; set; }
    public string Name { get; set; }
    public string? Description { get; set; }
    public Guid? DatasetTypeId { get; set; }
    public string? SourceInfo { get; set; }
    public decimal? QualityScore { get; set; }
}

public class BrowseDatasetRequestDto
{
    public int PageLimit { get; set; } = 20;
    public int PageOffset { get; set; } = 0;
    public Guid? DatasetTypeId { get; set; }
    public int? MinRating { get; set; }
    public DateTime? CreatedFrom { get; set; }
    public DateTime? CreatedTo { get; set; }
    public string? SearchTerm { get; set; }
    public string SortField { get; set; } = "created";
    public string SortOrder { get; set; } = "desc";
}

public class BrowseDatasetDto
{
    public Guid Id { get; set; }
    public Guid OwnerId { get; set; }
    public string? OwnerUsername { get; set; }
    public string Name { get; set; }
    public string? Description { get; set; }
    public string? Type { get; set; }
    public DateTime Created { get; set; }
    public decimal? QualityScore { get; set; }
    public decimal? AverageRating { get; set; }
    public decimal? Price { get; set; }
    public int TotalSales { get; set; }
}

public class DataSharingRequestDto
{
    public Guid Id { get; set; }
    public Guid RequestorId { get; set; }
    public Guid OwnerId { get; set; }
    public Guid DatasetId { get; set; }
    public string Status { get; set; }         // "pending", "approved", "declined", "completed"
    public string? Purpose { get; set; }
    public string? DatasetName { get; set; }
    public string? DatasetType { get; set; }
    public decimal? Price { get; set; }
    public string? OwnerUsername { get; set; }
    public string? RequestorUsername { get; set; }
    public string? MagnetUri { get; set; }
    public string? TransferStatus { get; set; } // "seeding", "downloading", "completed"
    public DateTime? SeedingStartedAt { get; set; }
    public DateTime? DownloadCompletedAt { get; set; }
    public string? HashLock { get; set; }
    public string? EscrowTxHash { get; set; }
    public string? EscrowSecret { get; set; }
    public string? EscrowState { get; set; }
    public DateTime? EscrowExpiry { get; set; }
    public DateTime? BuyerConfirmedAt { get; set; }
    public string? ClaimTxHash { get; set; }
    public DateTime Created { get; set; }
}

public class CreateDataSharingRequestDto
{
    public Guid? RequestorId { get; set; }  // Auto-set from auth if null
    public Guid OwnerId { get; set; }
    public Guid DatasetId { get; set; }
    public string? Purpose { get; set; }
}

public class ListDataSharingRequestDto
{
    public int PageLimit { get; set; } = 10000;
    public int PageOffset { get; set; } = 0;
    public string? SortField { get; set; }
    public string? SortOrder { get; set; }
    public string? Status { get; set; }
    public Guid? RequestorId { get; set; }
    public Guid? OwnerId { get; set; }
}

public class StateChannelDto
{
    public Guid Id { get; set; }
    public string ChannelId { get; set; }       // bytes32 hex
    public string Participant0 { get; set; }    // Seller address
    public string Participant1 { get; set; }    // Buyer address
    public long ChannelNonce { get; set; }
    public string Allocation0 { get; set; } = "0"; // Seller allocation (wei)
    public string Allocation1 { get; set; } = "0"; // Buyer allocation (wei)
    public long LatestTurnNum { get; set; }
    public string Status { get; set; }          // "Open", "Closed", "Disputed"
    public string ChannelType { get; set; }     // "DataTransfer"
    public string? OpenTxHash { get; set; }
    public string? CloseTxHash { get; set; }
    public DateTime Created { get; set; }
}

public class SignedStateDto
{
    public Guid Id { get; set; }
    public string ChannelId { get; set; }
    public long TurnNum { get; set; }
    public decimal Allocation0 { get; set; }
    public decimal Allocation1 { get; set; }
    public bool IsFinal { get; set; }
    public string? AppDataJson { get; set; }
    public string? Signature0 { get; set; }
    public string? Signature1 { get; set; }
    public int ChunkIndex { get; set; }
    public string? ChunkHash { get; set; }
    public string StateType { get; set; } = "GAME"; // GAME, PRE_FUND_SETUP, POST_FUND_SETUP, CONCLUDE
    public DateTime Created { get; set; }
}

public class VirtualEscrowDto
{
    public Guid Id { get; set; }
    public string PurchaseId { get; set; }
    public string BuyerChannelId { get; set; }
    public string SellerChannelId { get; set; }
    public Guid? DatasetId { get; set; }
    public string? DatasetName { get; set; }
    public string BuyerAddress { get; set; }
    public string SellerAddress { get; set; }
    public decimal Price { get; set; }
    public string HashLock { get; set; }
    public string? SecretPreimage { get; set; }
    public string Status { get; set; }
    public string? MagnetUri { get; set; }
    public DateTime? TimeoutAt { get; set; }
    public DateTime Created { get; set; }
}

public class OpenChannelRequest
{
    public string CounterpartyAddress { get; set; }
    public decimal DepositAmountEth { get; set; }
    public string ChannelType { get; set; }
}

public class SubmitSignedStateRequest
{
    public string ChannelId { get; set; }
    public long TurnNum { get; set; }
    public string Allocation0 { get; set; } = "0";
    public string Allocation1 { get; set; } = "0";
    public bool IsFinal { get; set; }
    public string? AppDataJson { get; set; }
    public string Signature0 { get; set; }
    public string Signature1 { get; set; }
    public int ChunkIndex { get; set; }
    public string? ChunkHash { get; set; }
    public string StateType { get; set; } = "GAME";
}