/* 
    This file is part of TON Blockchain source code.

    TON Blockchain is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License
    as published by the Free Software Foundation; either version 2
    of the License, or (at your option) any later version.

    TON Blockchain is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with TON Blockchain.  If not, see <http://www.gnu.org/licenses/>.

    In addition, as a special exception, the copyright holders give permission 
    to link the code of portions of this program with the OpenSSL library. 
    You must obey the GNU General Public License in all respects for all 
    of the code used other than OpenSSL. If you modify file(s) with this 
    exception, you may extend this exception to your version of the file(s), 
    but you are not obligated to do so. If you do not wish to do so, delete this 
    exception statement from your version. If you delete this exception statement 
    from all source files in the program, then also delete it here.

    Copyright 2017-2019 Telegram Systems LLP
*/
#include "adnl/adnl.h"
#include "adnl/utils.hpp"
#include "auto/tl/ton_api_json.h"
#include "dht/dht.h"
#include "overlay/overlays.h"
#include "td/utils/OptionsParser.h"
#include "td/utils/Time.h"
#include "td/utils/filesystem.h"
#include "td/utils/format.h"
#include "td/utils/Random.h"
#include "td/utils/port/signals.h"
#include "td/utils/port/FileFd.h"
#include "catchain/catchain.h"
#include "validator-session/validator-session.h"
#include "validator/manager-disk.h"
#include "td/utils/filesystem.h"
#include "td/utils/port/path.h"

#include "validator/fabric.h"
#include "validator/impl/collator.h"
#include "crypto/vm/cp0.h"
#include "crypto/block/block-db.h"

#include "common/errorlog.h"

#if TD_DARWIN || TD_LINUX
#include <unistd.h>
#endif
#include <iostream>
#include <sstream>

int verbosity;

struct IntError {
  std::string err_msg;
  IntError(std::string _msg) : err_msg(_msg) {
  }
  IntError(const char *_msg) : err_msg(_msg) {
  }
  IntError(td::Status _err) : err_msg(_err.to_string()) {
  }
  void show() const {
    std::cerr << "fatal: " << err_msg << std::endl;
  }
};

class TestNode : public td::actor::Actor {
 private:
  td::actor::ActorOwn<ton::validator::ValidatorManagerInterface> validator_manager_;

  std::string db_root_ = "/var/ton-work/db/";
  ton::ZeroStateIdExt zero_id_;
  td::BufferSlice bs_;
  std::vector<td::BufferSlice> ext_msgs_;
  std::vector<td::BufferSlice> top_shard_descrs_;
  std::string zero_file_path_;
  bool need_save_file_{false};
  bool tdescr_save_{false};
  std::string tdescr_pfx_;
  ton::BlockIdExt shard_top_block_id_;

  ton::ShardIdFull shard_{ton::masterchainId, ton::shardIdAll};

 public:
  void set_db_root(std::string db_root) {
    db_root_ = db_root;
  }
  void set_zero_root_hash(td::Bits256 hash) {
    zero_id_.root_hash = hash;
  }
  void set_zero_file_hash(td::Bits256 hash) {
    zero_id_.file_hash = hash;
  }
  void set_shard(ton::ShardIdFull shard) {
    LOG(DEBUG) << "setting shard to " << shard.to_str();
    shard_ = shard;
  }
  void set_shard_top_block(ton::BlockIdExt block_id) {
    shard_top_block_id_ = block_id;
  }
  void set_top_descr_prefix(std::string tdescr_pfx) {
    tdescr_pfx_ = tdescr_pfx;
    tdescr_save_ = true;
  }
  void set_collator_flags(int flags) {
    ton::collator_settings |= flags;
  }
  void start_up() override {
  }
  void alarm() override {
  }
  TestNode() {
    zero_id_.root_hash.clear();
    zero_id_.file_hash.clear();
  }

  void set_zero_file(std::string filename) {
    try {
      auto res1 = block::load_binary_file(filename);
      if (res1.is_error()) {
        throw IntError{res1.move_as_error()};
      }
      bs_ = res1.move_as_ok();
      auto res = ton::validator::create_shard_state(
          ton::BlockIdExt{ton::BlockId{shard_.workchain, ton::shardIdAll, 0}, zero_id_.root_hash, zero_id_.file_hash},
          bs_.clone());
      if (res.is_error()) {
        throw IntError{res.move_as_error()};
      }
      auto state = res.move_as_ok();
      ton::FileHash fhash = block::compute_file_hash(bs_.as_slice());
      ton::RootHash rhash = state->root_hash();
      CHECK(!fhash.is_zero());
      CHECK(!rhash.is_zero());
      if (!zero_id_.root_hash.is_zero()) {
        if (zero_id_.root_hash != rhash) {
          throw IntError{std::string{"root hash mismatch: expected "} + zero_id_.root_hash.to_hex() + " found " +
                         rhash.to_hex()};
        }
      }
      zero_id_.root_hash = rhash;
      if (!zero_id_.file_hash.is_zero()) {
        if (zero_id_.file_hash != fhash) {
          throw IntError{std::string{"file hash mismatch: expected "} + zero_id_.file_hash.to_hex() + " found " +
                         fhash.to_hex()};
        }
      }
      zero_id_.file_hash = fhash;
      need_save_file_ = true;
      zero_file_path_ = filename;
    } catch (IntError err) {
      err.show();
      std::exit(7);
    }
  }

  void load_ext_message(std::string filename) {
    try {
      auto res1 = block::load_binary_file(filename);
      if (res1.is_error()) {
        throw IntError{res1.move_as_error()};
      }
      ext_msgs_.emplace_back(res1.move_as_ok());
    } catch (IntError err) {
      err.show();
      std::exit(7);
    }
  }

  void load_shard_block_message(std::string filename) {
    try {
      auto res1 = block::load_binary_file(filename);
      if (res1.is_error()) {
        throw IntError{res1.move_as_error()};
      }
      top_shard_descrs_.emplace_back(res1.move_as_ok());
    } catch (IntError err) {
      err.show();
      std::exit(7);
    }
  }

  void do_save_file() {
    std::string fname = db_root_ + "/static/";
    fname.reserve(fname.size() + 2 * 3 + 64);
    static const char hex_digits[] = "0123456789ABCDEF";
    for (int i = 0; i < 2 * 0; i++) {
      unsigned x = zero_id_.file_hash.data()[i];
      fname.push_back(hex_digits[(x >> 4) & 15]);
      fname.push_back(hex_digits[x & 15]);
      fname.push_back('/');
      td::mkdir(fname).ensure();
    }
    for (int i = 0; i < 32; i++) {
      unsigned x = zero_id_.file_hash.data()[i];
      fname.push_back(hex_digits[(x >> 4) & 15]);
      fname.push_back(hex_digits[x & 15]);
    }
    auto res1 = block::load_binary_file(fname);
    if (res1.is_ok()) {
      if (res1.move_as_ok() != bs_) {
        std::cerr << "fatal: " << fname << " has wrong content" << std::endl;
        std::exit(7);
      }
    } else {
      auto res = block::save_binary_file(fname, bs_.clone());
      if (res.is_error()) {
        std::cerr << "fatal: cannot write file " << fname << ": " << res.to_string();
        std::exit(7);
      }
    }
  }

  void run() {
    zero_id_.workchain = ton::masterchainId;
    td::mkdir(db_root_).ensure();
    ton::errorlog::ErrorLog::create(db_root_);
    if (!shard_.is_masterchain() && need_save_file_) {
      td::mkdir(db_root_ + "/static").ensure();
      do_save_file();
    }

    auto opts = ton::validator::ValidatorManagerOptions::create(
        ton::BlockIdExt{ton::masterchainId, ton::shardIdAll, 0, zero_id_.root_hash, zero_id_.file_hash},
        ton::BlockIdExt{ton::masterchainId, ton::shardIdAll, 0, zero_id_.root_hash, zero_id_.file_hash});
    opts.write().set_initial_sync_disabled(true);
    validator_manager_ = ton::validator::ValidatorManagerDiskFactory::create(ton::PublicKeyHash::zero(), opts, shard_,
                                                                             shard_top_block_id_, db_root_);
    for (auto &msg : ext_msgs_) {
      td::actor::send_closure(validator_manager_, &ton::validator::ValidatorManager::new_external_message,
                              std::move(msg));
    }
    for (auto &topmsg : top_shard_descrs_) {
      td::actor::send_closure(validator_manager_, &ton::validator::ValidatorManager::new_shard_block, ton::BlockIdExt{},
                              0, std::move(topmsg));
    }
    class Callback : public ton::validator::ValidatorManagerInterface::Callback {
     private:
      td::actor::ActorId<ton::validator::ValidatorManagerInterface> id_;
      bool tdescr_save_;
      std::string tdescr_pfx_;
      int tdescr_cnt_ = 0;

     public:
      Callback(td::actor::ActorId<ton::validator::ValidatorManagerInterface> id, bool tdescr_save = false,
               std::string tdescr_pfx = "")
          : id_(id), tdescr_save_(tdescr_save), tdescr_pfx_(tdescr_pfx) {
      }

      void initial_read_complete(ton::validator::BlockHandle handle) override {
        td::actor::send_closure(id_, &ton::validator::ValidatorManager::sync_complete,
                                td::PromiseCreator::lambda([](td::Unit) {}));
      }
      void add_shard(ton::ShardIdFull) override {
      }
      void del_shard(ton::ShardIdFull) override {
      }
      void send_ihr_message(ton::AccountIdPrefixFull dst, td::BufferSlice data) override {
      }
      void send_ext_message(ton::AccountIdPrefixFull dst, td::BufferSlice data) override {
      }
      void send_shard_block_info(ton::BlockIdExt block_id, ton::CatchainSeqno cc_seqno, td::BufferSlice data) override {
        ++tdescr_cnt_;
        if (!tdescr_save_) {
          LOG(INFO) << "Ignoring newly-generated ShardTopBlockDescr for " << block_id.to_str();
        } else {
          char buffer[16];
          sprintf(buffer, "%d.boc", tdescr_cnt_);
          std::string fname = std::string{tdescr_pfx_.empty() ? "tdescr" : tdescr_pfx_} + buffer;
          LOG(INFO) << "Saving newly-generated ShardTopBlockDescr for " << block_id.to_str() << " into file " << fname;
          auto res = block::save_binary_file(fname, std::move(data));
          if (res.is_error()) {
            LOG(ERROR) << "Cannot save ShardTopBlockDescr for " << block_id.to_str() << " into file " << fname << " : "
                       << res.move_as_error().to_string();
          }
        }
      }
      void send_broadcast(ton::BlockBroadcast broadcast) override {
      }
      void download_block(ton::BlockIdExt block_id, td::uint32 priority, td::Timestamp timeout,
                          td::Promise<ton::ReceivedBlock> promise) override {
      }
      void download_zero_state(ton::BlockIdExt block_id, td::uint32 priority, td::Timestamp timeout,
                               td::Promise<td::BufferSlice> promise) override {
      }
      void download_persistent_state(ton::BlockIdExt block_id, ton::BlockIdExt masterchain_block_id,
                                     td::uint32 priority, td::Timestamp timeout,
                                     td::Promise<td::BufferSlice> promise) override {
      }
      void download_block_proof(ton::BlockIdExt block_id, td::uint32 priority, td::Timestamp timeout,
                                td::Promise<td::BufferSlice> promise) override {
      }
      void download_block_proof_link(ton::BlockIdExt block_id, td::uint32 priority, td::Timestamp timeout,
                                     td::Promise<td::BufferSlice> promise) override {
      }
      void get_next_key_blocks(ton::BlockIdExt block_id, td::Timestamp timeout,
                               td::Promise<std::vector<ton::BlockIdExt>> promise) override {
      }

      void new_key_block(ton::validator::BlockHandle handle) override {
      }
    };

    td::actor::send_closure(validator_manager_, &ton::validator::ValidatorManagerInterface::install_callback,
                            std::make_unique<Callback>(validator_manager_.get(), tdescr_save_, tdescr_pfx_),
                            td::PromiseCreator::lambda([](td::Unit) {}));
  }
};

td::Result<td::Bits256> get_uint256(td::Slice str) {
  TRY_RESULT(R, td::base64url_decode(str));
  if (R.length() != 32) {
    return td::Status::Error("uint256 must have 64 bytes");
  }
  td::Bits256 x;
  as_slice(x).copy_from(td::Slice(R));
  return x;
}

int parse_hex_digit(int c) {
  if (c >= '0' && c <= '9') {
    return c - '0';
  }
  c |= 0x20;
  if (c >= 'a' && c <= 'f') {
    return c - 'a' + 10;
  }
  return -1;
}

int main(int argc, char *argv[]) {
  SET_VERBOSITY_LEVEL(verbosity_INFO);
  td::set_default_failure_signal_handler().ensure();

  CHECK(vm::init_op_cp0());

  td::actor::ActorOwn<TestNode> x;

  td::OptionsParser p;
  p.set_description("test collate block");
  p.add_option('h', "help", "prints_help", [&]() {
    char b[10240];
    td::StringBuilder sb(td::MutableSlice{b, 10000});
    sb << p;
    std::cout << sb.as_cslice().c_str();
    std::exit(2);
    return td::Status::OK();
  });
  p.add_option('Z', "zero-root-hash", "zero state root hash (base64url-encoded)", [&](td::Slice fname) {
    td::actor::send_closure(x, &TestNode::set_zero_root_hash, get_uint256(fname).move_as_ok());
    return td::Status::OK();
  });
  p.add_option('F', "zero-file-hash", "zero state file hash (base64url-encoded)", [&](td::Slice fname) {
    td::actor::send_closure(x, &TestNode::set_zero_file_hash, get_uint256(fname).move_as_ok());
    return td::Status::OK();
  });
  p.add_option('z', "zero-state-file", "zero state file", [&](td::Slice fname) {
    td::actor::send_closure(x, &TestNode::set_zero_file, fname.str());
    return td::Status::OK();
  });
  p.add_option('D', "db", "root for dbs", [&](td::Slice fname) {
    td::actor::send_closure(x, &TestNode::set_db_root, fname.str());
    return td::Status::OK();
  });
  p.add_option('m', "ext-message", "binary file with serialized inbound external message", [&](td::Slice fname) {
    td::actor::send_closure(x, &TestNode::load_ext_message, fname.str());
    return td::Status::OK();
  });
  p.add_option('M', "top-shard-message", "binary file with serialized shard top block description",
               [&](td::Slice fname) {
                 td::actor::send_closure(x, &TestNode::load_shard_block_message, fname.str());
                 return td::Status::OK();
               });
  p.add_option('v', "verbosity", "set verbosity level", [&](td::Slice arg) {
    int v = VERBOSITY_NAME(FATAL) + (verbosity = td::to_integer<int>(arg));
    SET_VERBOSITY_LEVEL(v);
    return td::Status::OK();
  });
  p.add_option('w', "workchain", "<workchain>[:<shard>]\tcollate block in this workchain", [&](td::Slice arg) {
    ton::ShardId shard = 0;
    auto pos = std::min(arg.find(':'), arg.size());
    TRY_RESULT(workchain, td::to_integer_safe<int>(arg.substr(0, pos)));
    int s = 60;
    while (++pos < arg.size()) {
      int x = parse_hex_digit(arg[pos]);
      if (x < 0 || s < 0) {
        return td::Status::Error("cannot parse hexadecimal shard id (prefix)");
      }
      shard |= (ton::ShardId(x) << s);
      s -= 4;
    }
    td::actor::send_closure(x, &TestNode::set_shard, ton::ShardIdFull{workchain, shard ? shard : ton::shardIdAll});
    return td::Status::OK();
  });
  p.add_option('S', "want-split", "forces setting want_split in the header of new shard block", [&]() {
    td::actor::send_closure(x, &TestNode::set_collator_flags, 1);
    return td::Status::OK();
  });
  p.add_option('G', "want-merge", "forces setting want_merge in the header of new shard block", [&]() {
    td::actor::send_closure(x, &TestNode::set_collator_flags, 2);
    return td::Status::OK();
  });
  p.add_option('s', "save-top-descr", "saves generated shard top block description into files with specified prefix",
               [&](td::Slice arg) {
                 td::actor::send_closure(x, &TestNode::set_top_descr_prefix, arg.str());
                 return td::Status::OK();
               });
  p.add_option('T', "top-block", "BlockIdExt of top block (new block will be generated atop of it)",
               [&](td::Slice arg) {
                 ton::BlockIdExt block_id;
                 if (block::parse_block_id_ext(arg, block_id)) {
                   LOG(INFO) << "setting previous block to " << block_id.to_str();
                   td::actor::send_closure(x, &TestNode::set_shard_top_block, block_id);

                   return td::Status::OK();
                 } else {
                   return td::Status::Error("cannot parse BlockIdExt");
                 }
               });
  p.add_option('d', "daemonize", "set SIGHUP", [&]() {
    td::set_signal_handler(td::SignalType::HangUp, [](int sig) {
#if TD_DARWIN || TD_LINUX
      close(0);
      setsid();
#endif
    }).ensure();
    return td::Status::OK();
  });

  td::actor::Scheduler scheduler({7});

  scheduler.run_in_context([&] { x = td::actor::create_actor<TestNode>("testnode"); });

  scheduler.run_in_context([&] { p.run(argc, argv).ensure(); });
  scheduler.run_in_context([&] { td::actor::send_closure(x, &TestNode::run); });
  scheduler.run();

  return 0;
}