# -*- coding: utf-8 -*-
# ------------------------------------------------------------------------------
#
#   Copyright 2018-2020 Fetch.AI Limited
#
#   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
#
#       http://www.apache.org/licenses/LICENSE-2.0
#
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS,
#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#   See the License for the specific language governing permissions and
#   limitations under the License.
#
# ------------------------------------------------------------------------------

"""This package contains handlers for the erc1155-client skill."""

from typing import Optional, cast

from aea.configurations.base import PublicId
from aea.helpers.transaction.base import RawMessage, Terms
from aea.protocols.base import Message
from aea.skills.base import Handler

from packages.fetchai.connections.ledger.base import (
    CONNECTION_ID as LEDGER_CONNECTION_PUBLIC_ID,
)
from packages.fetchai.protocols.contract_api.message import ContractApiMessage
from packages.fetchai.protocols.default.message import DefaultMessage
from packages.fetchai.protocols.fipa.message import FipaMessage
from packages.fetchai.protocols.ledger_api.message import LedgerApiMessage
from packages.fetchai.protocols.oef_search.message import OefSearchMessage
from packages.fetchai.protocols.signing.message import SigningMessage
from packages.fetchai.skills.erc1155_client.dialogues import (
    ContractApiDialogue,
    ContractApiDialogues,
    DefaultDialogues,
    FipaDialogue,
    FipaDialogues,
    LedgerApiDialogue,
    LedgerApiDialogues,
    OefSearchDialogue,
    OefSearchDialogues,
    SigningDialogue,
    SigningDialogues,
)
from packages.fetchai.skills.erc1155_client.strategy import Strategy


LEDGER_API_ADDRESS = str(LEDGER_CONNECTION_PUBLIC_ID)


class FipaHandler(Handler):
    """This class implements a FIPA handler."""

    SUPPORTED_PROTOCOL = FipaMessage.protocol_id  # type: Optional[PublicId]

    def setup(self) -> None:
        """
        Implement the setup.

        :return: None
        """

    def handle(self, message: Message) -> None:
        """
        Implement the reaction to a message.

        :param message: the message
        :return: None
        """
        fipa_msg = cast(FipaMessage, message)

        # recover dialogue
        fipa_dialogues = cast(FipaDialogues, self.context.fipa_dialogues)
        fipa_dialogue = cast(FipaDialogue, fipa_dialogues.update(fipa_msg))
        if fipa_dialogue is None:
            self._handle_unidentified_dialogue(fipa_msg)
            return

        # handle message
        if fipa_msg.performative == FipaMessage.Performative.PROPOSE:
            self._handle_propose(fipa_msg, fipa_dialogue)
        else:
            self._handle_invalid(fipa_msg, fipa_dialogue)

    def teardown(self) -> None:
        """
        Implement the handler teardown.

        :return: None
        """

    def _handle_unidentified_dialogue(self, fipa_msg: FipaMessage) -> None:
        """
        Handle an unidentified dialogue.

        Respond to the sender with a default message containing the appropriate error information.

        :param fipa_msg: the message
        :return: None
        """
        self.context.logger.info(
            "unidentified dialogue for message={}.".format(fipa_msg)
        )
        default_dialogues = cast(DefaultDialogues, self.context.default_dialogues)
        default_msg, _ = default_dialogues.create(
            counterparty=fipa_msg.sender,
            performative=DefaultMessage.Performative.ERROR,
            error_code=DefaultMessage.ErrorCode.INVALID_DIALOGUE,
            error_msg="Invalid dialogue.",
            error_data={"fipa_message": fipa_msg.encode()},
        )
        self.context.outbox.put_message(message=default_msg)

    def _handle_propose(
        self, fipa_msg: FipaMessage, fipa_dialogue: FipaDialogue
    ) -> None:
        """
        Handle the CFP.

        If the CFP matches the supplied services then send a PROPOSE, otherwise send a DECLINE.

        :param fipa_msg: the message
        :param fipa_dialogue: the dialogue object
        :return: None
        """
        if all(
            key
            in [
                "contract_address",
                "from_supply",
                "to_supply",
                "value",
                "trade_nonce",
                "token_id",
            ]
            for key in fipa_msg.proposal.values.keys()
        ):
            # accept any proposal with the correct keys
            self.context.logger.info(
                "received valid PROPOSE from sender={}: proposal={}".format(
                    fipa_msg.sender[-5:], fipa_msg.proposal.values,
                )
            )
            strategy = cast(Strategy, self.context.strategy)
            contract_api_dialogues = cast(
                ContractApiDialogues, self.context.contract_api_dialogues
            )
            contract_api_msg, contract_api_dialogue = contract_api_dialogues.create(
                counterparty=LEDGER_API_ADDRESS,
                performative=ContractApiMessage.Performative.GET_RAW_MESSAGE,
                ledger_id=strategy.ledger_id,
                contract_id=strategy.contract_id,
                contract_address=fipa_msg.proposal.values["contract_address"],
                callable="get_hash_single",
                kwargs=ContractApiMessage.Kwargs(
                    {
                        "from_address": fipa_msg.sender,
                        "to_address": self.context.agent_address,
                        "token_id": int(fipa_msg.proposal.values["token_id"]),
                        "from_supply": int(fipa_msg.proposal.values["from_supply"]),
                        "to_supply": int(fipa_msg.proposal.values["to_supply"]),
                        "value": int(fipa_msg.proposal.values["value"]),
                        "trade_nonce": int(fipa_msg.proposal.values["trade_nonce"]),
                    }
                ),
            )
            terms = Terms(
                ledger_id=strategy.ledger_id,
                sender_address=self.context.agent_address,
                counterparty_address=fipa_msg.sender,
                amount_by_currency_id={},
                quantities_by_good_id={
                    str(fipa_msg.proposal.values["token_id"]): int(
                        fipa_msg.proposal.values["from_supply"]
                    )
                    - int(fipa_msg.proposal.values["to_supply"])
                },
                is_sender_payable_tx_fee=False,
                nonce=str(fipa_msg.proposal.values["trade_nonce"]),
            )
            contract_api_dialogue = cast(ContractApiDialogue, contract_api_dialogue)
            contract_api_dialogue.terms = terms
            contract_api_dialogue.associated_fipa_dialogue = fipa_dialogue
            self.context.outbox.put_message(message=contract_api_msg)
            self.context.logger.info(
                "requesting single hash message from contract api..."
            )
        else:
            self.context.logger.info(
                "received invalid PROPOSE from sender={}: proposal={}".format(
                    fipa_msg.sender[-5:], fipa_msg.proposal.values,
                )
            )

    def _handle_invalid(
        self, fipa_msg: FipaMessage, fipa_dialogue: FipaDialogue
    ) -> None:
        """
        Handle a fipa message of invalid performative.

        :param fipa_msg: the message
        :param fipa_dialogue: the dialogue object
        :return: None
        """
        self.context.logger.warning(
            "cannot handle fipa message of performative={} in dialogue={}.".format(
                fipa_msg.performative, fipa_dialogue
            )
        )


class OefSearchHandler(Handler):
    """This class implements an OEF search handler."""

    SUPPORTED_PROTOCOL = OefSearchMessage.protocol_id  # type: Optional[PublicId]

    def setup(self) -> None:
        """Call to setup the handler."""

    def handle(self, message: Message) -> None:
        """
        Implement the reaction to a message.

        :param message: the message
        :return: None
        """
        oef_search_msg = cast(OefSearchMessage, message)

        # recover dialogue
        oef_search_dialogues = cast(
            OefSearchDialogues, self.context.oef_search_dialogues
        )
        oef_search_dialogue = cast(
            Optional[OefSearchDialogue], oef_search_dialogues.update(oef_search_msg)
        )
        if oef_search_dialogue is None:
            self._handle_unidentified_dialogue(oef_search_msg)
            return

        # handle message
        if oef_search_msg.performative is OefSearchMessage.Performative.OEF_ERROR:
            self._handle_error(oef_search_msg, oef_search_dialogue)
        elif oef_search_msg.performative is OefSearchMessage.Performative.SEARCH_RESULT:
            self._handle_search(oef_search_msg, oef_search_dialogue)
        else:
            self._handle_invalid(oef_search_msg, oef_search_dialogue)

    def teardown(self) -> None:
        """
        Implement the handler teardown.

        :return: None
        """

    def _handle_unidentified_dialogue(self, oef_search_msg: OefSearchMessage) -> None:
        """
        Handle an unidentified dialogue.

        :param msg: the message
        """
        self.context.logger.info(
            "received invalid oef_search message={}, unidentified dialogue.".format(
                oef_search_msg
            )
        )

    def _handle_error(
        self, oef_search_msg: OefSearchMessage, oef_search_dialogue: OefSearchDialogue
    ) -> None:
        """
        Handle an oef search message.

        :param oef_search_msg: the oef search message
        :param oef_search_dialogue: the dialogue
        :return: None
        """
        self.context.logger.info(
            "received oef_search error message={} in dialogue={}.".format(
                oef_search_msg, oef_search_dialogue
            )
        )

    def _handle_search(
        self, oef_search_msg: OefSearchMessage, oef_search_dialogue: OefSearchDialogue
    ) -> None:
        """
        Handle the search response.

        :param agents: the agents returned by the search
        :return: None
        """
        if len(oef_search_msg.agents) == 0:
            self.context.logger.info(
                "found no agents in dialogue={}, continue searching.".format(
                    oef_search_dialogue
                )
            )
            return

        self.context.logger.info(
            "found agents={}, stopping search.".format(
                list(map(lambda x: x[-5:], oef_search_msg.agents)),
            )
        )
        strategy = cast(Strategy, self.context.strategy)
        strategy.is_searching = False
        query = strategy.get_service_query()
        fipa_dialogues = cast(FipaDialogues, self.context.fipa_dialogues)
        for opponent_address in oef_search_msg.agents:
            cfp_msg, _ = fipa_dialogues.create(
                counterparty=opponent_address,
                performative=FipaMessage.Performative.CFP,
                query=query,
            )
            self.context.logger.info(
                "sending CFP to agent={}".format(opponent_address[-5:])
            )
            self.context.outbox.put_message(message=cfp_msg)

    def _handle_invalid(
        self, oef_search_msg: OefSearchMessage, oef_search_dialogue: OefSearchDialogue
    ) -> None:
        """
        Handle an oef search message.

        :param oef_search_msg: the oef search message
        :param oef_search_dialogue: the dialogue
        :return: None
        """
        self.context.logger.warning(
            "cannot handle oef_search message of performative={} in dialogue={}.".format(
                oef_search_msg.performative, oef_search_dialogue,
            )
        )


class ContractApiHandler(Handler):
    """Implement the contract api handler."""

    SUPPORTED_PROTOCOL = ContractApiMessage.protocol_id  # type: Optional[PublicId]

    def setup(self) -> None:
        """Implement the setup for the handler."""

    def handle(self, message: Message) -> None:
        """
        Implement the reaction to a message.

        :param message: the message
        :return: None
        """
        contract_api_msg = cast(ContractApiMessage, message)

        # recover dialogue
        contract_api_dialogues = cast(
            ContractApiDialogues, self.context.contract_api_dialogues
        )
        contract_api_dialogue = cast(
            Optional[ContractApiDialogue],
            contract_api_dialogues.update(contract_api_msg),
        )
        if contract_api_dialogue is None:
            self._handle_unidentified_dialogue(contract_api_msg)
            return

        # handle message
        if contract_api_msg.performative is ContractApiMessage.Performative.RAW_MESSAGE:
            self._handle_raw_message(contract_api_msg, contract_api_dialogue)
        elif contract_api_msg.performative == ContractApiMessage.Performative.ERROR:
            self._handle_error(contract_api_msg, contract_api_dialogue)
        else:
            self._handle_invalid(contract_api_msg, contract_api_dialogue)

    def teardown(self) -> None:
        """
        Implement the handler teardown.

        :return: None
        """

    def _handle_unidentified_dialogue(
        self, contract_api_msg: ContractApiMessage
    ) -> None:
        """
        Handle an unidentified dialogue.

        :param msg: the message
        """
        self.context.logger.info(
            "received invalid contract_api message={}, unidentified dialogue.".format(
                contract_api_msg
            )
        )

    def _handle_raw_message(
        self,
        contract_api_msg: ContractApiMessage,
        contract_api_dialogue: ContractApiDialogue,
    ) -> None:
        """
        Handle a message of raw_message performative.

        :param contract_api_message: the ledger api message
        :param contract_api_dialogue: the ledger api dialogue
        """
        self.context.logger.info("received raw message={}".format(contract_api_msg))
        signing_dialogues = cast(SigningDialogues, self.context.signing_dialogues)
        signing_msg, signing_dialogue = signing_dialogues.create(
            counterparty=self.context.decision_maker_address,
            performative=SigningMessage.Performative.SIGN_MESSAGE,
            raw_message=RawMessage(
                contract_api_msg.raw_message.ledger_id,
                contract_api_msg.raw_message.body,
                is_deprecated_mode=True,
            ),
            terms=contract_api_dialogue.terms,
        )
        signing_dialogue = cast(SigningDialogue, signing_dialogue)
        signing_dialogue.associated_contract_api_dialogue = contract_api_dialogue
        self.context.decision_maker_message_queue.put_nowait(signing_msg)
        self.context.logger.info(
            "proposing the transaction to the decision maker. Waiting for confirmation ..."
        )

    def _handle_error(
        self,
        contract_api_msg: ContractApiMessage,
        contract_api_dialogue: ContractApiDialogue,
    ) -> None:
        """
        Handle a message of error performative.

        :param contract_api_message: the ledger api message
        :param contract_api_dialogue: the ledger api dialogue
        """
        self.context.logger.info(
            "received ledger_api error message={} in dialogue={}.".format(
                contract_api_msg, contract_api_dialogue
            )
        )

    def _handle_invalid(
        self,
        contract_api_msg: ContractApiMessage,
        contract_api_dialogue: ContractApiDialogue,
    ) -> None:
        """
        Handle a message of invalid performative.

        :param contract_api_message: the ledger api message
        :param contract_api_dialogue: the ledger api dialogue
        """
        self.context.logger.warning(
            "cannot handle contract_api message of performative={} in dialogue={}.".format(
                contract_api_msg.performative, contract_api_dialogue,
            )
        )


class SigningHandler(Handler):
    """Implement the transaction handler."""

    SUPPORTED_PROTOCOL = SigningMessage.protocol_id  # type: Optional[PublicId]

    def setup(self) -> None:
        """Implement the setup for the handler."""

    def handle(self, message: Message) -> None:
        """
        Implement the reaction to a message.

        :param message: the message
        :return: None
        """
        signing_msg = cast(SigningMessage, message)

        # recover dialogue
        signing_dialogues = cast(SigningDialogues, self.context.signing_dialogues)
        signing_dialogue = cast(
            Optional[SigningDialogue], signing_dialogues.update(signing_msg)
        )
        if signing_dialogue is None:
            self._handle_unidentified_dialogue(signing_msg)
            return

        # handle message
        if signing_msg.performative is SigningMessage.Performative.SIGNED_MESSAGE:
            self._handle_signed_message(signing_msg, signing_dialogue)
        elif signing_msg.performative is SigningMessage.Performative.ERROR:
            self._handle_error(signing_msg, signing_dialogue)
        else:
            self._handle_invalid(signing_msg, signing_dialogue)

    def teardown(self) -> None:
        """
        Implement the handler teardown.

        :return: None
        """

    def _handle_unidentified_dialogue(self, signing_msg: SigningMessage) -> None:
        """
        Handle an unidentified dialogue.

        :param msg: the message
        """
        self.context.logger.info(
            "received invalid signing message={}, unidentified dialogue.".format(
                signing_msg
            )
        )

    def _handle_signed_message(
        self, signing_msg: SigningMessage, signing_dialogue: SigningDialogue
    ) -> None:
        """
        Handle a signed message.

        :param signing_msg: the signing message
        :param signing_dialogue: the dialogue
        :return: None
        """
        fipa_dialogue = (
            signing_dialogue.associated_contract_api_dialogue.associated_fipa_dialogue
        )
        last_fipa_msg = fipa_dialogue.last_incoming_message
        if last_fipa_msg is None:
            raise ValueError("Could not retrieve last fipa message.")
        inform_msg = fipa_dialogue.reply(
            performative=FipaMessage.Performative.ACCEPT_W_INFORM,
            target_message=last_fipa_msg,
            info={"tx_signature": signing_msg.signed_message.body},
        )
        self.context.logger.info(
            "sending ACCEPT_W_INFORM to agent={}: tx_signature={}".format(
                last_fipa_msg.sender[-5:], signing_msg.signed_message,
            )
        )
        self.context.outbox.put_message(message=inform_msg)

    def _handle_error(
        self, signing_msg: SigningMessage, signing_dialogue: SigningDialogue
    ) -> None:
        """
        Handle an oef search message.

        :param signing_msg: the signing message
        :param signing_dialogue: the dialogue
        :return: None
        """
        self.context.logger.info(
            "transaction signing was not successful. Error_code={} in dialogue={}".format(
                signing_msg.error_code, signing_dialogue
            )
        )

    def _handle_invalid(
        self, signing_msg: SigningMessage, signing_dialogue: SigningDialogue
    ) -> None:
        """
        Handle an oef search message.

        :param signing_msg: the signing message
        :param signing_dialogue: the dialogue
        :return: None
        """
        self.context.logger.warning(
            "cannot handle signing message of performative={} in dialogue={}.".format(
                signing_msg.performative, signing_dialogue
            )
        )


class LedgerApiHandler(Handler):
    """Implement the ledger api handler."""

    SUPPORTED_PROTOCOL = LedgerApiMessage.protocol_id  # type: Optional[PublicId]

    def setup(self) -> None:
        """Implement the setup for the handler."""

    def handle(self, message: Message) -> None:
        """
        Implement the reaction to a message.

        :param message: the message
        :return: None
        """
        ledger_api_msg = cast(LedgerApiMessage, message)

        # recover dialogue
        ledger_api_dialogues = cast(
            LedgerApiDialogues, self.context.ledger_api_dialogues
        )
        ledger_api_dialogue = cast(
            Optional[LedgerApiDialogue], ledger_api_dialogues.update(ledger_api_msg)
        )
        if ledger_api_dialogue is None:
            self._handle_unidentified_dialogue(ledger_api_msg)
            return

        # handle message
        if ledger_api_msg.performative is LedgerApiMessage.Performative.BALANCE:
            self._handle_balance(ledger_api_msg)
        elif ledger_api_msg.performative == LedgerApiMessage.Performative.ERROR:
            self._handle_error(ledger_api_msg, ledger_api_dialogue)
        else:
            self._handle_invalid(ledger_api_msg, ledger_api_dialogue)

    def teardown(self) -> None:
        """
        Implement the handler teardown.

        :return: None
        """

    def _handle_unidentified_dialogue(self, ledger_api_msg: LedgerApiMessage) -> None:
        """
        Handle an unidentified dialogue.

        :param msg: the message
        """
        self.context.logger.info(
            "received invalid ledger_api message={}, unidentified dialogue.".format(
                ledger_api_msg
            )
        )

    def _handle_balance(self, ledger_api_msg: LedgerApiMessage) -> None:
        """
        Handle a message of balance performative.

        :param ledger_api_message: the ledger api message
        """
        self.context.logger.info(
            "starting balance on {} ledger={}.".format(
                ledger_api_msg.ledger_id, ledger_api_msg.balance,
            )
        )

    def _handle_error(
        self, ledger_api_msg: LedgerApiMessage, ledger_api_dialogue: LedgerApiDialogue
    ) -> None:
        """
        Handle a message of error performative.

        :param ledger_api_message: the ledger api message
        :param ledger_api_dialogue: the ledger api dialogue
        """
        self.context.logger.info(
            "received ledger_api error message={} in dialogue={}.".format(
                ledger_api_msg, ledger_api_dialogue
            )
        )

    def _handle_invalid(
        self, ledger_api_msg: LedgerApiMessage, ledger_api_dialogue: LedgerApiDialogue
    ) -> None:
        """
        Handle a message of invalid performative.

        :param ledger_api_message: the ledger api message
        :param ledger_api_dialogue: the ledger api dialogue
        """
        self.context.logger.warning(
            "cannot handle ledger_api message of performative={} in dialogue={}.".format(
                ledger_api_msg.performative, ledger_api_dialogue,
            )
        )
