syntax = "proto3";
package emerald;
option java_package = "io.emeraldpay.api.proto";
import "common.proto";

service Blockchain {
    rpc SubscribeHead (Chain) returns (stream ChainHead) {}
    rpc SubscribeBalance (BalanceRequest) returns (stream AddressBalance) {}
    rpc SubscribeTxStatus (TxStatusRequest) returns (stream TxStatus) {}

    rpc GetBalance (BalanceRequest) returns (stream AddressBalance) {}

    /**
     * Fee Estimation service. The server tries to estimate a fair fee based on the last N blocks.
     */
    rpc EstimateFee (EstimateFeeRequest) returns (EstimateFeeResponse) {}

    rpc NativeCall (NativeCallRequest) returns (stream NativeCallReplyItem) {}
    rpc NativeSubscribe (NativeSubscribeRequest) returns (stream NativeSubscribeReplyItem) {}

    rpc Describe (DescribeRequest) returns (DescribeResponse) {}
    rpc SubscribeStatus (StatusRequest) returns (stream ChainStatus) {}
}

message NativeCallRequest {
    ChainRef chain = 1;
    repeated NativeCallItem items = 2;
    Selector selector = 3;
    int32 quorum = 4;
    AvailabilityEnum min_availability = 5;
}

message NativeCallItem {
    uint32 id = 1;
    string method = 3;
    bytes payload = 4;
}

message NativeCallReplyItem {
    uint32 id = 1;
    bool succeed = 2;
    bytes payload = 3;
    string errorMessage = 4;
}

message NativeSubscribeRequest {
    ChainRef chain = 1;
    string method = 2;
    bytes payload = 3;
}

message NativeSubscribeReplyItem {
    bytes payload = 1;
}

message ChainHead {
    ChainRef chain = 1;
    uint64 height = 2;
    string block_id = 3;
    uint64 timestamp = 4;
    bytes weight = 5;
    uint64 reorg = 6;
}

message TxStatusRequest {
    ChainRef chain = 1;
    string tx_id = 2;
    uint32 confirmation_limit = 3;
}

message TxStatus {
    string tx_id = 1;
    bool broadcasted = 2;
    bool mined = 3;
    BlockInfo block = 4;
    uint32 confirmations = 5;
}

message BalanceRequest {
    Asset asset = 1;
    AnyAddress address = 2;
    bool include_utxo = 3;
}

message AddressBalance {
    Asset asset = 1;
    SingleAddress address = 2;
    string balance = 3;
    bool confirmed = 4;
    repeated Utxo utxo = 5;
}

message Utxo {
    string tx_id = 1;
    uint64 index = 2;
    string balance = 3;
    bool spent = 4;
}

message DescribeRequest {
}

message DescribeResponse {
    repeated DescribeChain chains = 1;
}

message DescribeChain {
    ChainRef chain = 1;
    ChainStatus status = 2;
    repeated NodeDetails nodes = 3;
    repeated string supportedMethods = 4;
    repeated string excludedMethods = 5;
    repeated Capabilities capabilities = 6;
}

message StatusRequest {
    repeated ChainRef chains = 1;
}

message ChainStatus {
    ChainRef chain = 1;
    AvailabilityEnum availability = 2;
    uint32 quorum = 3;
}

enum AvailabilityEnum {
    AVAIL_UNKNOWN = 0;
    AVAIL_OK = 1;
    AVAIL_LAGGING = 2;
    AVAIL_IMMATURE = 3;
    AVAIL_SYNCING = 4;
    AVAIL_UNAVAILABLE = 5;
}

message NodeDetails {
    uint32 quorum = 1;
    repeated Label labels = 2;
}

enum Capabilities {
    CAP_NONE = 0;
    CAP_CALLS = 1;
    CAP_BALANCE = 2;
}

message Label {
    string name = 1;
    string value = 2;
}

message Selector {
    oneof selector_type {
        LabelSelector labelSelector = 1;
        OrSelector orSelector = 2;
        AndSelector andSelector = 3;
        NotSelector notSelector = 4;
        ExistsSelector existsSelector = 5;
    }
}

message LabelSelector {
    string name = 1;
    repeated string value = 2;
}

message OrSelector {
    repeated Selector selectors = 1;
}

message AndSelector {
    repeated Selector selectors = 1;
}

message NotSelector {
    Selector selector = 1;
}

message ExistsSelector {
    string name = 1;
}

/**
 * Request for Fee Estimation Service
 */
message EstimateFeeRequest {
    // Target chain
    ChainRef chain = 1;
    // The way how the fee should be estimated
    FeeEstimationMode mode = 2;
    // How many blocks the server is supposed to use to estimate current fee. Note that the server may use value, depending on configuration
    uint32 blocks = 3;
}

/**
 * Responset for Fee Estimation Service
 */
message EstimateFeeResponse {
    // May return different struct, depending on the blockchain
    oneof fee_type {
        // Standard Ethereum Fee, supported by majority of forks and by Ethereum Mainnet before EIP-1559
        EthereumStdFees ethereumStd = 1;
        // Ethereum Fee for EIP-1559 compatible forks
        EthereumExtFees ethereumExtended = 2;
        // Standard Bitcoin Fee
        BitcoinStdFees bitcoinStd = 3;
    }
}

/**
 * The mode of how the fee must be estimated
 */
enum FeeEstimationMode {
    INVALID = 0;
    // Average over last transaction in each block
    AVG_LAST = 1;
    // Average over transaction 5th from the end in each block
    AVG_T5 = 2;
    // Average over transaction 20th from the end in each block
    AVG_T20 = 3;
    // Average over transaction 50th from the end in each block
    AVG_T50 = 4;
    // Minimal fee that would be accepted by every last block
    MIN_ALWAYS = 5;
    // Average over transaction in the middle of each block
    AVG_MIDDLE = 6;
    // Average over transaction in head of each block. Note that for Bitcoin it doesn't count COINBASE tx as top tx.
    AVG_TOP = 7;
}

/**
 * Standard Ethereum Fee, supported by majority of forks and by Ethereum Mainnet before EIP-1559
 */
message EthereumStdFees {
    // Fee value in Wei
    string fee = 1;
}

/**
 * Ethereum Fee for EIP-1559 compatible forks
 */
message EthereumExtFees {
    // Estimated fee that would be actually paid. I.e. it's the Base Fee + Priority Fee
    string expect = 1;
    // Priority Fee in Wei
    string priority = 2;
    // Max Fee value in Wei. Note that it only indicated current preference and actual Max may be significantly lower, depending on the usage scenario.
    string max = 3;
}

/**
 * Standard Bitcoin Fee
 */
message BitcoinStdFees {
    // Fee in Satoshi per Kilobyte. Note that the actual fee calculation MUST divide it by 1024 at the last step to get a fair fee.
    string satPerKb = 1;
}