# Author:	Louis Holbrook <dev@holbrook.no> 0826EDA1702D1E87C6E2875121D2E7BB88C2A746
# SPDX-License-Identifier:	GPL-3.0-or-later
# File-version: 1
# Description: Python interface to abi and bin files for faucet contracts

# standard imports
import logging
import json
import os
import hashlib

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

logg = logging.getLogger(__name__)

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


def to_declarator_key(declarator_address_hex, declaration_address_hex):
    h = hashlib.new('sha256')
    h.update(bytes.fromhex(strip_0x(declaration_address_hex)))
    h.update(bytes.fromhex(strip_0x(declarator_address_hex)))
    return h.digest()


class AddressDeclarator(TxFactory):

    __abi = None
    __bytecode = None

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


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


    def constructor(self, sender_address, initial_description):
        code = AddressDeclarator.bytecode()
        enc = ABIContractEncoder()
        initial_description_hex = add_0x(initial_description)
        enc.bytes32(initial_description_hex)
        code += enc.get()
        tx = self.template(sender_address, None, use_nonce=True)
        tx = self.set_code(tx, code)
        return self.build(tx)

    
    def add_declaration(self, contract_address, sender_address, subject_address, proof, tx_format=TxFormat.JSONRPC):
        enc = ABIContractEncoder()
        enc.method('addDeclaration')
        enc.typ(ABIContractType.ADDRESS)
        enc.typ(ABIContractType.BYTES32)
        enc.address(subject_address)
        enc.bytes32(proof)
        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 declarator_count(self, contract_address, subject_address, sender_address=ZERO_ADDRESS):
        o = jsonrpc_template()
        o['method'] = 'eth_call'
        enc = ABIContractEncoder()
        enc.method('declaratorCount')
        enc.typ(ABIContractType.ADDRESS)
        enc.address(subject_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 declaration(self, contract_address, declarator_address, subject_address, sender_address=ZERO_ADDRESS):
        o = jsonrpc_template()
        o['method'] = 'eth_call'
        enc = ABIContractEncoder()
        enc.method('declaration')
        enc.typ(ABIContractType.ADDRESS)
        enc.typ(ABIContractType.ADDRESS)
        enc.address(declarator_address)
        enc.address(subject_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 declaration_address_at(self, contract_address, declarator_address, idx, sender_address=ZERO_ADDRESS):
        o = jsonrpc_template()
        o['method'] = 'eth_call'
        enc = ABIContractEncoder()
        enc.method('declarationAddressAt')
        enc.typ(ABIContractType.ADDRESS)
        enc.typ(ABIContractType.UINT256)
        enc.address(declarator_address)
        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


    def declarator_address_at(self, contract_address, subject_address, idx, sender_address=ZERO_ADDRESS):
        o = jsonrpc_template()
        o['method'] = 'eth_call'
        enc = ABIContractEncoder()
        enc.method('declaratorAddressAt')
        enc.typ(ABIContractType.ADDRESS)
        enc.typ(ABIContractType.UINT256)
        enc.address(subject_address)
        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_declarator_count(self, v):
        return abi_decode_single(ABIContractType.UINT256, v)

    
    @classmethod
    def parse_declaration(self, v):
        cursor = 0
        v = strip_0x(v)
        position = int.from_bytes(bytes.fromhex(v[cursor:cursor+64]), 'big')
        cursor += (position * 2)
        length = int.from_bytes(bytes.fromhex(v[cursor:cursor+64]), 'big')
        cursor += 64
        r = []
        for i in range(length):
            r.append(v[cursor:cursor+64])
            cursor += 64
        return r 


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


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