//------------------------------------------------------------------------------
/*
    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.
*/
//==============================================================================

#include <ripple/basics/Log.h>
#include <ripple/basics/Slice.h>
#include <ripple/basics/contract.h>
#include <ripple/basics/safe_cast.h>
#include <ripple/beast/core/LexicalCast.h>
#include <ripple/protocol/HashPrefix.h>
#include <ripple/protocol/digest.h>
#include <ripple/shamap/SHAMapAccountStateLeafNode.h>
#include <ripple/shamap/SHAMapInnerNode.h>
#include <ripple/shamap/SHAMapLeafNode.h>
#include <ripple/shamap/SHAMapTreeNode.h>
#include <ripple/shamap/SHAMapTxLeafNode.h>
#include <ripple/shamap/SHAMapTxPlusMetaLeafNode.h>
#include <mutex>

#include <openssl/sha.h>

namespace ripple {

std::shared_ptr<SHAMapTreeNode>
SHAMapTreeNode::makeTransaction(
    Slice data,
    SHAMapHash const& hash,
    bool hashValid)
{
    auto item = std::make_shared<SHAMapItem const>(
        sha512Half(HashPrefix::transactionID, data), data);

    if (hashValid)
        return std::make_shared<SHAMapTxLeafNode>(std::move(item), 0, hash);

    return std::make_shared<SHAMapTxLeafNode>(std::move(item), 0);
}

std::shared_ptr<SHAMapTreeNode>
SHAMapTreeNode::makeTransactionWithMeta(
    Slice data,
    SHAMapHash const& hash,
    bool hashValid)
{
    Serializer s(data.data(), data.size());

    uint256 tag;

    if (s.size() < tag.bytes)
        Throw<std::runtime_error>("Short TXN+MD node");

    // FIXME: improve this interface so that the above check isn't needed
    if (!s.getBitString(tag, s.size() - tag.bytes))
        Throw<std::out_of_range>(
            "Short TXN+MD node (" + std::to_string(s.size()) + ")");

    s.chop(tag.bytes);

    auto item = std::make_shared<SHAMapItem const>(tag, s.slice());

    if (hashValid)
        return std::make_shared<SHAMapTxPlusMetaLeafNode>(
            std::move(item), 0, hash);

    return std::make_shared<SHAMapTxPlusMetaLeafNode>(std::move(item), 0);
}

std::shared_ptr<SHAMapTreeNode>
SHAMapTreeNode::makeAccountState(
    Slice data,
    SHAMapHash const& hash,
    bool hashValid)
{
    Serializer s(data.data(), data.size());

    uint256 tag;

    if (s.size() < tag.bytes)
        Throw<std::runtime_error>("short AS node");

    // FIXME: improve this interface so that the above check isn't needed
    if (!s.getBitString(tag, s.size() - tag.bytes))
        Throw<std::out_of_range>(
            "Short AS node (" + std::to_string(s.size()) + ")");

    s.chop(tag.bytes);

    if (tag.isZero())
        Throw<std::runtime_error>("Invalid AS node");

    auto item = std::make_shared<SHAMapItem const>(tag, s.slice());

    if (hashValid)
        return std::make_shared<SHAMapAccountStateLeafNode>(
            std::move(item), 0, hash);

    return std::make_shared<SHAMapAccountStateLeafNode>(std::move(item), 0);
}

std::shared_ptr<SHAMapTreeNode>
SHAMapTreeNode::makeFromWire(Slice rawNode)
{
    if (rawNode.empty())
        return {};

    auto const type = rawNode[rawNode.size() - 1];

    rawNode.remove_suffix(1);

    bool const hashValid = false;
    SHAMapHash const hash;

    if (type == wireTypeTransaction)
        return makeTransaction(rawNode, hash, hashValid);

    if (type == wireTypeAccountState)
        return makeAccountState(rawNode, hash, hashValid);

    if (type == wireTypeInner)
        return SHAMapInnerNode::makeFullInner(rawNode, hash, hashValid);

    if (type == wireTypeCompressedInner)
        return SHAMapInnerNode::makeCompressedInner(rawNode);

    if (type == wireTypeTransactionWithMeta)
        return makeTransactionWithMeta(rawNode, hash, hashValid);

    Throw<std::runtime_error>(
        "wire: Unknown type (" + std::to_string(type) + ")");
}

std::shared_ptr<SHAMapTreeNode>
SHAMapTreeNode::makeFromPrefix(Slice rawNode, SHAMapHash const& hash)
{
    if (rawNode.size() < 4)
        Throw<std::runtime_error>("prefix: short node");

    // FIXME: Use SerialIter::get32?
    // Extract the prefix
    auto const type = safe_cast<HashPrefix>(
        (safe_cast<std::uint32_t>(rawNode[0]) << 24) +
        (safe_cast<std::uint32_t>(rawNode[1]) << 16) +
        (safe_cast<std::uint32_t>(rawNode[2]) << 8) +
        (safe_cast<std::uint32_t>(rawNode[3])));

    rawNode.remove_prefix(4);

    bool const hashValid = true;

    if (type == HashPrefix::transactionID)
        return makeTransaction(rawNode, hash, hashValid);

    if (type == HashPrefix::leafNode)
        return makeAccountState(rawNode, hash, hashValid);

    if (type == HashPrefix::innerNode)
        return SHAMapInnerNode::makeFullInner(rawNode, hash, hashValid);

    if (type == HashPrefix::txNode)
        return makeTransactionWithMeta(rawNode, hash, hashValid);

    Throw<std::runtime_error>(
        "prefix: unknown type (" +
        std::to_string(safe_cast<std::underlying_type_t<HashPrefix>>(type)) +
        ")");
}

std::string
SHAMapTreeNode::getString(const SHAMapNodeID& id) const
{
    return to_string(id);
}

}  // namespace ripple