# standard imports
import logging
import json
import os

# external imports
from chainlib.eth.tx import (
        TxFactory,
        TxFormat,
        )
from chainlib.eth.contract import (
        ABIContractEncoder,
        ABIContractDecoder,
        ABIContractType,
        abi_decode_single,
        )
from chainlib.eth.constant import ZERO_ADDRESS
from chainlib.jsonrpc import (
        jsonrpc_template,
        )
from chainlib.eth.error import RequestMismatchException
from hexathon import (
        add_0x,
        strip_0x,
        )

logg = logging.getLogger()

moddir = os.path.dirname(__file__)
datadir = os.path.join(moddir, 'data')


class AccountRegistry(TxFactory):

    __abi = None
    __bytecode = None

    @staticmethod
    def abi():
        if AccountRegistry.__abi == None:
            f = open(os.path.join(datadir, 'AccountsIndex.json'), 'r')
            AccountRegistry.__abi = json.load(f)
            f.close()
        return AccountRegistry.__abi


    @staticmethod
    def bytecode():
        if AccountRegistry.__bytecode == None:
            f = open(os.path.join(datadir, 'AccountsIndex.bin'))
            AccountRegistry.__bytecode = f.read()
            f.close()
        return AccountRegistry.__bytecode


    @staticmethod
    def gas(code=None):
        return 700000


    def constructor(self, sender_address):
        code = AccountRegistry.bytecode()
        tx = self.template(sender_address, None, use_nonce=True)
        tx = self.set_code(tx, code)
        return self.build(tx)


    def add(self, contract_address, sender_address, address, tx_format=TxFormat.JSONRPC):
        return self.__single_address_method('add', contract_address, sender_address, address, tx_format)


    def add_writer(self, contract_address, sender_address, address, tx_format=TxFormat.JSONRPC):
        return self.__single_address_method('addWriter', contract_address, sender_address, address, tx_format)


    def delete_writer(self, contract_address, sender_address, address, tx_format=TxFormat.JSONRPC):
        return self.__single_address_method('deleteWriter', contract_address, sender_address, address, tx_format)


    def __single_address_method(self, method, contract_address, sender_address, address, tx_format=TxFormat.JSONRPC):
        enc = ABIContractEncoder()
        enc.method(method)
        enc.typ(ABIContractType.ADDRESS)
        enc.address(address)
        data = enc.get()
        tx = self.template(sender_address, contract_address, use_nonce=True)
        tx = self.set_code(tx, data)
        tx = self.finalize(tx, tx_format)        
        return tx


    def have(self, contract_address, address, sender_address=ZERO_ADDRESS):
        o = jsonrpc_template()
        o['method'] = 'eth_call'
        enc = ABIContractEncoder()
        enc.method('have')
        enc.typ(ABIContractType.ADDRESS)
        enc.address(address)
        data = add_0x(enc.get())
        tx = self.template(sender_address, contract_address)
        tx = self.set_code(tx, data)
        o['params'].append(self.normalize(tx))
        return o


    def count(self, contract_address, sender_address=ZERO_ADDRESS):
        o = jsonrpc_template()
        o['method'] = 'eth_call'
        enc = ABIContractEncoder()
        enc.method('count')
        data = add_0x(enc.get())
        tx = self.template(sender_address, contract_address)
        tx = self.set_code(tx, data)
        o['params'].append(self.normalize(tx))
        return o


    def account(self, contract_address, idx, sender_address=ZERO_ADDRESS):
        o = jsonrpc_template()
        o['method'] = 'eth_call'
        enc = ABIContractEncoder()
        enc.method('accounts')
        enc.typ(ABIContractType.UINT256)
        enc.uint256(idx)
        data = add_0x(enc.get())
        tx = self.template(sender_address, contract_address)
        tx = self.set_code(tx, data)
        o['params'].append(self.normalize(tx))
        return o


    @classmethod
    def parse_account(self, v):
        return abi_decode_single(ABIContractType.ADDRESS, v)


    @classmethod
    def parse_have(self, v):
        return abi_decode_single(ABIContractType.BOOLEAN, v)


    @classmethod
    def parse_add_request(self, v):
        v = strip_0x(v)
        cursor = 0
        enc = ABIContractEncoder()
        enc.method('add')
        enc.typ(ABIContractType.ADDRESS)
        r = enc.get()
        l = len(r)
        m = v[:l]
        if m != r:
            logg.error('method mismatch, expected {}, got {}'.format(r, m))
            raise RequestMismatchException(v)
        cursor += l

        dec = ABIContractDecoder()
        dec.typ(ABIContractType.ADDRESS)
        dec.val(v[cursor:cursor+64])
        r = dec.decode()
        return r