// Copyright (c) 2014-2016, The Monero Project
//
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// permitted provided that the following conditions are met:
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//    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.
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//    used to endorse or promote products derived from this software without specific
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#pragma once

#include <boost/filesystem.hpp>
#include "cryptonote_core/blockchain.h" // BlockchainDB
#include "cryptonote_core/blockchain_storage.h" // in-memory DB
#include "blockchain_db/blockchain_db.h"
#include "blockchain_db/lmdb/db_lmdb.h"
#if defined(BERKELEY_DB)
#include "blockchain_db/berkeleydb/db_bdb.h"
#endif

using namespace cryptonote;

namespace
{
  // NOTE: These values should match blockchain.cpp
  // TODO: Refactor
  const uint64_t mainnet_hard_fork_version_1_till = 1009826;
  const uint64_t testnet_hard_fork_version_1_till = 624633;
}


#if !defined(BLOCKCHAIN_DB) || BLOCKCHAIN_DB == DB_LMDB

struct fake_core_db
{
  Blockchain m_storage;
  HardFork* m_hardfork = nullptr;
  tx_memory_pool m_pool;
  bool support_batch;
  bool support_add_block;

  // for multi_db_runtime:
#if !defined(BLOCKCHAIN_DB)
  fake_core_db(const boost::filesystem::path &path, const bool use_testnet=false, const bool do_batch=true, const std::string& db_type="lmdb", const int db_flags=0) : m_pool(&m_storage), m_storage(m_pool)
  // for multi_db_compile:
#else
  fake_core_db(const boost::filesystem::path &path, const bool use_testnet=false, const bool do_batch=true, const std::string& db_type="lmdb", const int db_flags=0) : m_pool(m_storage), m_storage(m_pool)
#endif
  {
    m_pool.init(path.string());

    BlockchainDB* db = nullptr;
    if (db_type == "lmdb")
      db = new BlockchainLMDB();
#if defined(BERKELEY_DB)
    else if (db_type == "berkeley")
      db = new BlockchainBDB();
#endif
    else
    {
      LOG_ERROR("Attempted to use non-existent database type: " << db_type);
      throw tools::runtime_error("Attempting to use non-existent database type");
    }

    boost::filesystem::path folder(path);

    folder /= db->get_db_name();

    LOG_PRINT_L0("Loading blockchain from folder " << folder.string() << " ...");

    const std::string filename = folder.string();
    try
    {
      db->open(filename, db_flags);
    }
    catch (const std::exception& e)
    {
      LOG_PRINT_L0("Error opening database: " << e.what());
      throw;
    }

    db->check_hard_fork_info();

    uint64_t hard_fork_version_1_till = use_testnet ? testnet_hard_fork_version_1_till : mainnet_hard_fork_version_1_till;
    m_hardfork = new HardFork(*db, 1, hard_fork_version_1_till);

    m_storage.init(db, m_hardfork, use_testnet);

    if (do_batch)
      m_storage.get_db().set_batch_transactions(do_batch);
    support_batch = true;
    support_add_block = true;
  }
  ~fake_core_db()
  {
    m_storage.get_db().check_hard_fork_info();
    m_storage.deinit();
  }

  uint64_t 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
                            )
  {
    return m_storage.get_db().add_block(blk, block_size, cumulative_difficulty, coins_generated, txs);
  }

  void batch_start(uint64_t batch_num_blocks = 0)
  {
    m_storage.get_db().batch_start(batch_num_blocks);
  }

  void batch_stop()
  {
    m_storage.get_db().batch_stop();
  }

};
#endif

#if !defined(BLOCKCHAIN_DB) || BLOCKCHAIN_DB == DB_MEMORY

struct fake_core_memory
{
  blockchain_storage m_storage;
  tx_memory_pool m_pool;
  bool support_batch;
  bool support_add_block;

  // for multi_db_runtime:
#if !defined(BLOCKCHAIN_DB)
  fake_core_memory(const boost::filesystem::path &path, const bool use_testnet=false) : m_pool(&m_storage), m_storage(m_pool)
#else
  // for multi_db_compile:
  fake_core_memory(const boost::filesystem::path &path, const bool use_testnet=false) : m_pool(m_storage), m_storage(&m_pool)
#endif
  {
    m_pool.init(path.string());
    m_storage.init(path.string(), use_testnet);
    support_batch = false;
    support_add_block = false;
  }
  ~fake_core_memory()
  {
    LOG_PRINT_L3("fake_core_memory() destructor called - want to see it ripple down");
    m_storage.deinit();
  }

  uint64_t 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
                            )
  {
    // TODO:
    // would need to refactor handle_block_to_main_chain() to have a direct add_block() method like Blockchain class
    throw tools::runtime_error("direct add_block() method not implemented for in-memory db");
    return 2;
  }

  void batch_start(uint64_t batch_num_blocks = 0)
  {
    LOG_PRINT_L0("WARNING: [batch_start] opt_batch set, but this database doesn't support/need transactions - ignoring");
  }

  void batch_stop()
  {
    LOG_PRINT_L0("WARNING: [batch_stop] opt_batch set, but this database doesn't support/need transactions - ignoring");
  }

};

#endif