import os

ROOT_DIR = os.path.abspath(os.path.dirname(__file__))
BIP0039_DIR = os.path.normpath(os.path.join(ROOT_DIR, 'bip39_word_list'))

MAX_AMOUNT = 2100000000000000
SIGHASH_ALL = 0x00000001
SIGHASH_NONE = 0x00000002
SIGHASH_SINGLE = 0x00000003
SIGHASH_ANYONECANPAY = 0x00000080
ECDSA_SEC256K1_ORDER = 0xfffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141

MAINNET_ADDRESS_BYTE_PREFIX = b'\x00'
TESTNET_ADDRESS_BYTE_PREFIX = b'\x6f'
MAINNET_SCRIPT_ADDRESS_BYTE_PREFIX = b'\x05'
TESTNET_SCRIPT_ADDRESS_BYTE_PREFIX = b'\xc4'
MAINNET_SEGWIT_ADDRESS_BYTE_PREFIX = b'\x03\x03\x00\x02\x03'
TESTNET_SEGWIT_ADDRESS_BYTE_PREFIX = b'\x03\x03\x00\x14\x02'

MAINNET_ADDRESS_PREFIX = '1'
TESTNET_ADDRESS_PREFIX = 'm'
TESTNET_ADDRESS_PREFIX_2 = 'n'
MAINNET_SCRIPT_ADDRESS_PREFIX = '3'
TESTNET_SCRIPT_ADDRESS_PREFIX = '2'

MAINNET_PRIVATE_KEY_UNCOMPRESSED_PREFIX = '5'
MAINNET_PRIVATE_KEY_COMPRESSED_PREFIX = 'K'
MAINNET_PRIVATE_KEY_COMPRESSED_PREFIX_2 = 'L'
TESTNET_PRIVATE_KEY_UNCOMPRESSED_PREFIX = '9'
TESTNET_PRIVATE_KEY_COMPRESSED_PREFIX = 'c'

ADDRESS_PREFIX_LIST = (MAINNET_ADDRESS_PREFIX,
                       TESTNET_ADDRESS_PREFIX,
                       TESTNET_ADDRESS_PREFIX_2,
                       MAINNET_SCRIPT_ADDRESS_PREFIX,
                       TESTNET_SCRIPT_ADDRESS_PREFIX)

PRIVATE_KEY_PREFIX_LIST = (MAINNET_PRIVATE_KEY_UNCOMPRESSED_PREFIX,
                           MAINNET_PRIVATE_KEY_COMPRESSED_PREFIX,
                           MAINNET_PRIVATE_KEY_COMPRESSED_PREFIX_2,
                           TESTNET_PRIVATE_KEY_UNCOMPRESSED_PREFIX,
                           TESTNET_PRIVATE_KEY_COMPRESSED_PREFIX)

MAINNET_PRIVATE_KEY_BYTE_PREFIX = b'\x80'
TESTNET_PRIVATE_KEY_BYTE_PREFIX = b'\xef'

MAINNET_SEGWIT_ADDRESS_PREFIX = 'bc'
TESTNET_SEGWIT_ADDRESS_PREFIX = 'tb'


SCRIPT_TYPES = {"P2PKH":        0,
                "P2SH":         1,
                "PUBKEY":       2,
                "NULL_DATA":    3,
                "MULTISIG":     4,
                "P2WPKH":       5,
                "P2WSH":        6,
                "NON_STANDARD": 7,
                "NULL_DATA_NON_STANDARD": 8
                }


# CONSTANTS hierarchical deterministic wallets (HD Wallets)
MAINNET_XPRIVATE_KEY_PREFIX = b'\x04\x88\xAD\xE4'
MAINNET_XPUBLIC_KEY_PREFIX = b'\x04\x88\xB2\x1E'
TESTNET_XPRIVATE_KEY_PREFIX = b'\x04\x35\x83\x94'
TESTNET_XPUBLIC_KEY_PREFIX = b'\x04\x35\x87\xCF'
HARDENED_KEY = 0x80000000
FIRST_HARDENED_CHILD = 0x80000000
PATH_LEVEL_BIP0044 = [0x8000002C, 0x80000000, 0x80000000, 0, 0]
TESTNET_PATH_LEVEL_BIP0044 = [0x8000002C, 0x80000001, 0x80000000, 0, 0]