// Copyright (c) 2014, The Monero Project
// 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
// 
// 1. Redistributions of source code must retain the above copyright notice, this list of
//    conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
//    of conditions and the following disclaimer in the documentation and/or other
//    materials provided with the distribution.
// 
// 3. Neither the name of the copyright holder nor the names of its contributors may be
//    used to endorse or promote products derived from this software without specific
//    prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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#include "cryptonote_core/blockchain_db.h"
#include "cryptonote_format_utils.h"

using epee::string_tools::pod_to_hex;

namespace cryptonote
{

void BlockchainDB::pop_block()
{
  block blk;
  std::vector<transaction> txs;
  pop_block(blk, txs);
}

void BlockchainDB::add_transaction(const crypto::hash& blk_hash, const transaction& tx)
{
  crypto::hash tx_hash = get_transaction_hash(tx);

  add_transaction_data(blk_hash, tx);

  // iterate tx.vout using indices instead of C++11 foreach syntax because
  // we need the index
  if (tx.vout.size() != 0)  // it may be technically possible for a tx to have no outputs
  {
    for (uint64_t i = 0; i < tx.vout.size(); ++i)
    {
      add_output(tx_hash, tx.vout[i], i);
    }

    for (const txin_v& tx_input : tx.vin)
    {
      if (tx_input.type() == typeid(txin_to_key))
      {
        add_spent_key(boost::get<txin_to_key>(tx_input).k_image);
      }
    }
  }
}

uint64_t BlockchainDB::add_block( const block& blk
                                , const size_t& block_size
                                , const difficulty_type& cumulative_difficulty
                                , const uint64_t& coins_generated
                                , const std::vector<transaction>& txs
                                )
{
  crypto::hash blk_hash = get_block_hash(blk);

  // call out to subclass implementation to add the block & metadata
  add_block(blk, block_size, cumulative_difficulty, coins_generated);

  // call out to add the transactions

  add_transaction(blk_hash, blk.miner_tx);
  for (const transaction& tx : txs)
  {
    add_transaction(blk_hash, tx);
  }

  return height();
}

void BlockchainDB::pop_block(block& blk, std::vector<transaction>& txs)
{
  blk = get_top_block();

  remove_block();
  
  remove_transaction(get_transaction_hash(blk.miner_tx));
  for (const auto& h : blk.tx_hashes)
  {
    txs.push_back(get_tx(h));
    remove_transaction(h);
  }
}

void BlockchainDB::remove_transaction(const crypto::hash& tx_hash)
{
  transaction tx = get_tx(tx_hash);

  // TODO: This loop calling remove_output() should be removed. It doesn't do
  // anything (function is empty), and the outputs were already intended to be
  // removed later as part of remove_transaction_data().
  for (const tx_out& tx_output : tx.vout)
  {
    remove_output(tx_output);
  }

  for (const txin_v& tx_input : tx.vin)
  {
    if (tx_input.type() == typeid(txin_to_key))
    {
      remove_spent_key(boost::get<txin_to_key>(tx_input).k_image);
    }
  }

  // need tx as tx.vout has the tx outputs, and the output amounts are needed
  remove_transaction_data(tx_hash, tx);
}

}  // namespace cryptonote