//------------------------------------------------------------------------------
/*
    This file is part of rippled: https://github.com/ripple/rippled
    Copyright (c) 2012, 2013 Ripple Labs Inc.

    Permission to use, copy, modify, and/or distribute this software for any
    purpose  with  or without fee is hereby granted, provided that the above
    copyright notice and this permission notice appear in all copies.

    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================

#ifndef RIPPLE_PROTOCOL_STTX_H_INCLUDED
#define RIPPLE_PROTOCOL_STTX_H_INCLUDED

#include <xrpl/basics/Expected.h>
#include <xrpl/protocol/Feature.h>
#include <xrpl/protocol/PublicKey.h>
#include <xrpl/protocol/Rules.h>
#include <xrpl/protocol/STObject.h>
#include <xrpl/protocol/SecretKey.h>
#include <xrpl/protocol/SeqProxy.h>
#include <xrpl/protocol/TxFormats.h>

#include <boost/container/flat_set.hpp>

#include <functional>

namespace ripple {

enum TxnSql : char {
    txnSqlNew = 'N',
    txnSqlConflict = 'C',
    txnSqlHeld = 'H',
    txnSqlValidated = 'V',
    txnSqlIncluded = 'I',
    txnSqlUnknown = 'U'
};

class STTx final : public STObject, public CountedObject<STTx>
{
    uint256 tid_;
    TxType tx_type_;

public:
    static std::size_t const minMultiSigners = 1;

    // if rules are not supplied then the largest possible value is returned
    static std::size_t
    maxMultiSigners(Rules const* rules = 0)
    {
        if (rules && !rules->enabled(featureExpandedSignerList))
            return 8;

        return 32;
    }

    STTx() = delete;
    STTx(STTx const& other) = default;
    STTx&
    operator=(STTx const& other) = delete;

    explicit STTx(SerialIter& sit);
    explicit STTx(SerialIter&& sit);
    explicit STTx(STObject&& object);

    /** Constructs a transaction.

        The returned transaction will have the specified type and
        any fields that the callback function adds to the object
        that's passed in.
    */
    STTx(TxType type, std::function<void(STObject&)> assembler);

    // STObject functions.
    SerializedTypeID
    getSType() const override;

    std::string
    getFullText() const override;

    // Outer transaction functions / signature functions.
    Blob
    getSignature(STObject const& sigObject) const;

    Blob
    getSignature() const
    {
        return getSignature(*this);
    }

    uint256
    getSigningHash() const;

    TxType
    getTxnType() const;

    Blob
    getSigningPubKey() const;

    SeqProxy
    getSeqProxy() const;

    /** Returns the first non-zero value of (Sequence, TicketSequence). */
    std::uint32_t
    getSeqValue() const;

    boost::container::flat_set<AccountID>
    getMentionedAccounts() const;

    uint256
    getTransactionID() const;

    Json::Value
    getJson(JsonOptions options) const override;

    Json::Value
    getJson(JsonOptions options, bool binary) const;

    void
    sign(PublicKey const& publicKey, SecretKey const& secretKey);

    enum class RequireFullyCanonicalSig : bool { no, yes };

    /** Check the signature.
        @param requireCanonicalSig If `true`, check that the signature is fully
            canonical. If `false`, only check that the signature is valid.
        @param rules The current ledger rules.
        @param pSig Pointer to object that contains the signature fields, if not
            using "this". Will most often be null
        @return `true` if valid signature. If invalid, the error message string.
    */
    Expected<void, std::string>
    checkSign(
        RequireFullyCanonicalSig requireCanonicalSig,
        Rules const& rules,
        STObject const* pSig) const;

    /** Check the signature.
        @param requireCanonicalSig If `true`, check that the signature is fully
            canonical. If `false`, only check that the signature is valid.
        @param rules The current ledger rules.
        @return `true` if valid signature. If invalid, the error message string.
    */
    Expected<void, std::string>
    checkSign(RequireFullyCanonicalSig requireCanonicalSig, Rules const& rules)
        const;

    // SQL Functions with metadata.
    static std::string const&
    getMetaSQLInsertReplaceHeader();

    std::string
    getMetaSQL(std::uint32_t inLedger, std::string const& escapedMetaData)
        const;

    std::string
    getMetaSQL(
        Serializer rawTxn,
        std::uint32_t inLedger,
        char status,
        std::string const& escapedMetaData) const;

private:
    Expected<void, std::string>
    checkSingleSign(
        RequireFullyCanonicalSig requireCanonicalSig,
        STObject const* pSig) const;

    Expected<void, std::string>
    checkMultiSign(
        RequireFullyCanonicalSig requireCanonicalSig,
        Rules const& rules,
        STObject const* pSig) const;

    STBase*
    copy(std::size_t n, void* buf) const override;
    STBase*
    move(std::size_t n, void* buf) override;

    friend class detail::STVar;
};

bool
passesLocalChecks(STObject const& st, std::string&);

/** Sterilize a transaction.

    The transaction is serialized and then deserialized,
    ensuring that all equivalent transactions are in canonical
    form. This also ensures that program metadata such as
    the transaction's digest, are all computed.
*/
std::shared_ptr<STTx const>
sterilize(STTx const& stx);

/** Check whether a transaction is a pseudo-transaction */
bool
isPseudoTx(STObject const& tx);

inline STTx::STTx(SerialIter&& sit) : STTx(sit)
{
}

inline TxType
STTx::getTxnType() const
{
    return tx_type_;
}

inline Blob
STTx::getSigningPubKey() const
{
    return getFieldVL(sfSigningPubKey);
}

inline uint256
STTx::getTransactionID() const
{
    return tid_;
}

}  // namespace ripple

#endif