# -*- coding: utf-8 -*-
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#
#   Copyright 2018-2021 Fetch.AI Limited
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#   Licensed under the Apache License, Version 2.0 (the "License");
#   you may not use this file except in compliance with the License.
#   You may obtain a copy of the License at
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#       http://www.apache.org/licenses/LICENSE-2.0
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#   distributed under the License is distributed on an "AS IS" BASIS,
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# ------------------------------------------------------------------------------

"""Wallet Generation."""

from abc import ABC, abstractmethod
from collections import UserString
from typing import Optional

from bip_utils import Bip39SeedGenerator, Bip44, Bip44Coins  # type: ignore

from cosmpy.crypto.address import Address
from cosmpy.crypto.hashfuncs import sha256
from cosmpy.crypto.interface import Signer
from cosmpy.crypto.keypairs import PrivateKey, PublicKey


class Wallet(ABC, UserString):
    """Wallet Generation.

    :param ABC: ABC abstract method
    :param UserString: user string
    """

    @abstractmethod
    def address(self) -> Address:
        """get the address of the wallet.

        :return: None
        """

    @abstractmethod
    def public_key(self) -> PublicKey:
        """get the public key of the wallet.

        :return: None
        """

    @abstractmethod
    def signer(self) -> Signer:
        """get the signer of the wallet.

        :return: None
        """

    @property
    def data(self):
        """Get the address of the wallet.

        :return: Address
        """
        return self.address()

    def __json__(self):
        """
        Return the address in string format.

        :return: address in string format
        """
        return str(self.address())


class LocalWallet(Wallet):
    """Generate local wallet.

    :param Wallet: wallet
    """

    @staticmethod
    def generate(prefix: Optional[str] = None) -> "LocalWallet":
        """generate the local wallet.

        :param prefix: prefix, defaults to None
        :return: local wallet
        """
        return LocalWallet(PrivateKey(), prefix=prefix)

    @staticmethod
    def from_mnemonic(mnemonic: str, prefix: Optional[str] = None) -> "LocalWallet":
        """Generate local wallet from mnemonic.

        :param mnemonic: mnemonic
        :param prefix: prefix, defaults to None
        :return: local wallet
        """
        seed_bytes = Bip39SeedGenerator(mnemonic).Generate()
        bip44_def_ctx = Bip44.FromSeed(
            seed_bytes, Bip44Coins.COSMOS
        ).DeriveDefaultPath()
        return LocalWallet(
            PrivateKey(bip44_def_ctx.PrivateKey().Raw().ToBytes()), prefix=prefix
        )

    @staticmethod
    def from_unsafe_seed(
        text: str, index: Optional[int] = None, prefix: Optional[str] = None
    ) -> "LocalWallet":
        """Generate local wallet from unsafe seed.

        :param text: text
        :param index: index, defaults to None
        :param prefix: prefix, defaults to None
        :return: Local wallet
        """
        private_key_bytes = sha256(text.encode())
        if index is not None:
            private_key_bytes = sha256(
                private_key_bytes + index.to_bytes(4, byteorder="big")
            )
        return LocalWallet(PrivateKey(private_key_bytes), prefix=prefix)

    def __init__(self, private_key: PrivateKey, prefix: Optional[str] = None):
        """Init wallet with.

        :param private_key: private key of the wallet
        :param prefix: prefix, defaults to None
        """
        self._private_key = private_key
        self._public_key = private_key.public_key
        self._prefix = prefix

    def address(self) -> Address:
        """Get the wallet address.

        :return: Wallet address.
        """
        return Address(self._public_key, self._prefix)

    def public_key(self) -> PublicKey:
        """Get the public key of the wallet.

        :return: public key
        """
        return self._public_key

    def signer(self) -> PrivateKey:
        """Get  the signer of the wallet.

        :return: signer
        """
        return self._private_key
