text: # -*- coding: utf-8 -*-
  #
  # Electrum - lightweight Bitcoin client
  # Copyright (C) 2018 The Electrum developers
  #
  # Permission is hereby granted, free of charge, to any person
  # obtaining a copy of this software and associated documentation files
  # (the "Software"), to deal in the Software without restriction,
  # including without limitation the rights to use, copy, modify, merge,
  # publish, distribute, sublicense, and/or sell copies of the Software,
  # and to permit persons to whom the Software is furnished to do so,
  # subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be
  # included in all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  # BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  # ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  # SOFTWARE.
  
  import os
  import json
  
  
  def read_json(filename, default):
      path = os.path.join(os.path.dirname(__file__), filename)
      try:
          with open(path, 'r') as f:
              r = json.loads(f.read())
      except:
          r = default
      return r
  
  
  class AbstractNet:
  
      @classmethod
      def max_checkpoint(cls) -> int:
          return max(0, len(cls.CHECKPOINTS) * 2016 - 1)
  
  
  class BitcoinMainnet(AbstractNet):
  
      TESTNET = False
      WIF_PREFIX = 0x80
      ADDRTYPE_P2PKH = 48
      ADDRTYPE_P2SH = 50
      SEGWIT_HRP = "btcc"
      GENESIS = "12a765e31ffd4059bada1e25190f6e98c99d9714d334efa41a195a7e7e04bfe2"
      DEFAULT_PORTS = {'t': '50001', 's': '50002'}
      DEFAULT_SERVERS = read_json('servers.json', {})
      CHECKPOINTS = read_json('checkpoints.json', [])
  
      XPRV_HEADERS = {
          'standard':    0x0488ade4,  # xprv
          'p2wpkh-p2sh': 0x049d7878,  # yprv
          'p2wsh-p2sh':  0x0295b005,  # Yprv
          'p2wpkh':      0x04b2430c,  # zprv
          'p2wsh':       0x02aa7a99,  # Zprv
      }
      XPUB_HEADERS = {
          'standard':    0x0488b21e,  # xpub
          'p2wpkh-p2sh': 0x049d7cb2,  # ypub
          'p2wsh-p2sh':  0x0295b43f,  # Ypub
          'p2wpkh':      0x04b24746,  # zpub
          'p2wsh':       0x02aa7ed3,  # Zpub
      }
      BIP44_COIN_TYPE = 2
  
  
  class BitcoinTestnet(AbstractNet):
  
      TESTNET = True
      WIF_PREFIX = 0xbf
      ADDRTYPE_P2PKH = 111
      ADDRTYPE_P2SH = 58
      SEGWIT_HRP = "tbtcc"
      GENESIS = "4966625a4b2851d9fdee139e56211a0d88575f59ed816ff5e6a63deb4e3e29a0"
      DEFAULT_PORTS = {'t': '51001', 's': '51002'}
      DEFAULT_SERVERS = read_json('servers_testnet.json', {})
      CHECKPOINTS = read_json('checkpoints_testnet.json', [])
  
      XPRV_HEADERS = {
          'standard':    0x04358394,  # tprv
          'p2wpkh-p2sh': 0x044a4e28,  # uprv
          'p2wsh-p2sh':  0x024285b5,  # Uprv
          'p2wpkh':      0x045f18bc,  # vprv
          'p2wsh':       0x02575048,  # Vprv
      }
      XPUB_HEADERS = {
          'standard':    0x043587cf,  # tpub
          'p2wpkh-p2sh': 0x044a5262,  # upub
          'p2wsh-p2sh':  0x024289ef,  # Upub
          'p2wpkh':      0x045f1cf6,  # vpub
          'p2wsh':       0x02575483,  # Vpub
      }
      BIP44_COIN_TYPE = 1
  
  
  class BitcoinRegtest(BitcoinTestnet):
  
      SEGWIT_HRP = "rbtcc"
      GENESIS = "530827f38f93b43ed12af0b3ad25a288dc02ed74d6d7857862df51fc56c416f9"
      DEFAULT_SERVERS = read_json('servers_regtest.json', {})
      CHECKPOINTS = []
  
  
  class BitcoinSimnet(BitcoinTestnet):
  
      SEGWIT_HRP = "sb"
      GENESIS = "683e86bd5c6d110d91b94b97137ba6bfe02dbbdb8e3dff722a669b5d69d77af6"
      DEFAULT_SERVERS = read_json('servers_regtest.json', {})
      CHECKPOINTS = []
  
  
  # don't import net directly, import the module instead (so that net is singleton)
  net = BitcoinMainnet
  
  def set_simnet():
      global net
      net = BitcoinSimnet
  
  def set_mainnet():
      global net
      net = BitcoinMainnet
  
  
  def set_testnet():
      global net
      net = BitcoinTestnet
  
  
  def set_regtest():
      global net
      net = BitcoinRegtest
  