# # ⚠ Warning
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
# LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
# NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
# [🥭 Mango Markets](https://mango.markets/) support is available at:
#   [Docs](https://docs.mango.markets/)
#   [Discord](https://discord.gg/67jySBhxrg)
#   [Twitter](https://twitter.com/mangomarkets)
#   [Github](https://github.com/blockworks-foundation)
#   [Email](mailto:hello@blockworks.foundation)


import base58
import logging
import traceback
import typing

from datetime import datetime
from decimal import Decimal
from solana.publickey import PublicKey

from .context import Context
from .datetimes import datetime_from_timestamp
from .instructiontype import InstructionType
from .instrumentvalue import InstrumentValue
from .logmessages import expand_log_messages
from .mangoinstruction import MangoInstruction
from .layouts import layouts
from .ownedinstrumentvalue import OwnedInstrumentValue
from .text import indent_collection_as_str, indent_item_by


# # 🥭 TransactionScout
#
# ## Transaction Indices
#
# Transactions come with a large account list.
#
# Instructions, individually, take accounts.
#
# The accounts instructions take are listed in the the transaction's list of accounts.
#
# The instruction data therefore doesn't need to specify account public keys, only the
# index of those public keys in the main transaction's list.
#
# So, for example, if an instruction uses 3 accounts, the instruction data could say
# [3, 2, 14], meaning the first account it uses is index 3 in the whole transaction account
# list, the second is index 2 in the whole transaction account list, the third is index 14
# in the whole transaction account list.
#
# This complicates figuring out which account is which for a given instruction, especially
# since some of the accounts (like the sender/signer account) can appear at different
# indices depending on which instruction is being used.
#
# We keep a few static dictionaries here to allow us to dereference important accounts per
# type.
#
# In addition, we dereference the accounts for each instruction when we instantiate each
# `MangoInstruction`, so users of `MangoInstruction` don't need to worry about
# these details.
#


# # 🥭 TransactionScout class
#
class TransactionScout:
    def __init__(
        self,
        timestamp: datetime,
        signatures: typing.Sequence[str],
        succeeded: bool,
        group_name: str,
        accounts: typing.Sequence[PublicKey],
        instructions: typing.Sequence[MangoInstruction],
        messages: typing.Sequence[str],
        pre_token_balances: typing.Sequence[OwnedInstrumentValue],
        post_token_balances: typing.Sequence[OwnedInstrumentValue],
    ) -> None:
        self.timestamp: datetime = timestamp
        self.signatures: typing.Sequence[str] = signatures
        self.succeeded: bool = succeeded
        self.group_name: str = group_name
        self.accounts: typing.Sequence[PublicKey] = accounts
        self.instructions: typing.Sequence[MangoInstruction] = instructions
        self.messages: typing.Sequence[str] = messages
        self.pre_token_balances: typing.Sequence[
            OwnedInstrumentValue
        ] = pre_token_balances
        self.post_token_balances: typing.Sequence[
            OwnedInstrumentValue
        ] = post_token_balances

    @property
    def summary(self) -> str:
        result = "[Success]" if self.succeeded else "[Failed]"
        instructions = ", ".join(
            [ins.instruction_type.name for ins in self.instructions]
        )
        changes = OwnedInstrumentValue.changes(
            self.pre_token_balances, self.post_token_balances
        )

        in_tokens = []
        for ins in self.instructions:
            if ins.token_in_account is not None:
                in_tokens += [
                    OwnedInstrumentValue.find_by_owner(changes, ins.token_in_account)
                ]

        out_tokens = []
        for ins in self.instructions:
            if ins.token_out_account is not None:
                out_tokens += [
                    OwnedInstrumentValue.find_by_owner(changes, ins.token_out_account)
                ]

        changed_tokens = in_tokens + out_tokens
        changed_tokens_text = (
            ", ".join(
                [
                    f"{tok.token_value.value:,.8f} {tok.token_value.token.name}"
                    for tok in changed_tokens
                ]
            )
            or "None"
        )

        return f"« TransactionScout {result} {self.group_name} [{self.timestamp}] {instructions}: Token Changes: {changed_tokens_text}\n    {self.signatures} »"

    @property
    def sender(self) -> typing.Optional[PublicKey]:
        return self.instructions[0].sender if len(self.instructions) > 0 else None

    @property
    def group(self) -> typing.Optional[PublicKey]:
        return self.instructions[0].group if len(self.instructions) > 0 else None

    def has_any_instruction_of_type(self, instruction_type: InstructionType) -> bool:
        return any(
            map(lambda ins: ins.instruction_type == instruction_type, self.instructions)
        )

    @staticmethod
    def load_if_available(
        context: Context, signature: str
    ) -> typing.Optional["TransactionScout"]:
        transaction_details = context.client.get_confirmed_transaction(signature)
        if transaction_details is None:
            return None
        return TransactionScout.from_transaction_response(context, transaction_details)

    @staticmethod
    def load(context: Context, signature: str) -> "TransactionScout":
        tx = TransactionScout.load_if_available(context, signature)
        if tx is None:
            raise Exception(f"Transaction '{signature}' not found.")
        return tx

    @staticmethod
    def from_transaction_response(
        context: Context, response: typing.Dict[str, typing.Any]
    ) -> "TransactionScout":
        def balance_to_token_value(
            accounts: typing.Sequence[PublicKey], balance: typing.Dict[str, typing.Any]
        ) -> OwnedInstrumentValue:
            mint = PublicKey(balance["mint"])
            account = accounts[balance["accountIndex"]]
            amount = Decimal(balance["uiTokenAmount"]["amount"])
            decimals = Decimal(balance["uiTokenAmount"]["decimals"])
            divisor = Decimal(10) ** decimals
            value = amount / divisor
            token = context.instrument_lookup.find_by_mint_or_raise(mint)
            return OwnedInstrumentValue(account, InstrumentValue(token, value))

        try:
            succeeded = True if response["meta"]["err"] is None else False
            accounts = list(
                map(PublicKey, response["transaction"]["message"]["accountKeys"])
            )
            instructions: typing.List[MangoInstruction] = []
            for instruction_data in response["transaction"]["message"]["instructions"]:
                instruction = mango_instruction_from_response(
                    context, accounts, instruction_data
                )
                if instruction is not None:
                    instructions += [instruction]

            group_name = (
                context.lookup_group_name(instructions[0].group)
                if len(instructions) > 0
                else "No Group"
            )
            timestamp = datetime_from_timestamp(response["blockTime"])
            signatures = response["transaction"]["signatures"]
            raw_messages = response["meta"]["logMessages"]
            messages = expand_log_messages(raw_messages)
            pre_token_balances = list(
                map(
                    lambda bal: balance_to_token_value(accounts, bal),
                    response["meta"]["preTokenBalances"],
                )
            )
            post_token_balances = list(
                map(
                    lambda bal: balance_to_token_value(accounts, bal),
                    response["meta"]["postTokenBalances"],
                )
            )
            return TransactionScout(
                timestamp,
                signatures,
                succeeded,
                group_name,
                accounts,
                instructions,
                messages,
                pre_token_balances,
                post_token_balances,
            )
        except Exception as exception:
            signature = "Unknown"
            if (
                response
                and ("transaction" in response)
                and ("signatures" in response["transaction"])
                and len(response["transaction"]["signatures"]) > 0
            ):
                signature = ", ".join(response["transaction"]["signatures"])
            raise Exception(
                f"Exception fetching transaction '{signature}' - {traceback.format_exc()}",
                exception,
            )

    def __str__(self) -> str:
        def format_tokens(
            account_token_values: typing.Sequence[OwnedInstrumentValue],
        ) -> str:
            if len(account_token_values) == 0:
                return "None"
            return "\n        ".join([f"{atv}" for atv in account_token_values])

        instruction_names = ", ".join(
            [ins.instruction_type.name for ins in self.instructions]
        )
        signatures = indent_item_by(indent_collection_as_str(self.signatures), 2)
        accounts = indent_item_by(indent_collection_as_str(self.accounts), 2)
        messages = indent_item_by(indent_collection_as_str(self.messages), 2)
        instructions = indent_item_by(indent_collection_as_str(self.instructions), 2)
        changes = OwnedInstrumentValue.changes(
            self.pre_token_balances, self.post_token_balances
        )
        tokens_in = format_tokens(self.pre_token_balances)
        tokens_out = format_tokens(self.post_token_balances)
        token_changes = format_tokens(changes)
        return f"""« TransactionScout {self.timestamp}: {instruction_names}
    Sender:
        {self.sender}
    Succeeded:
        {self.succeeded}
    Group:
        {self.group_name} [{self.group}]
    Signatures:
        {signatures}
    Instructions:
        {instructions}
    Accounts:
        {accounts}
    Messages:
        {messages}
    Tokens In:
        {tokens_in}
    Tokens Out:
        {tokens_out}
    Token Changes:
        {token_changes}
»"""

    def __repr__(self) -> str:
        return f"{self}"


# # 🥭 fetch_all_recent_transaction_signatures function
#
def fetch_all_recent_transaction_signatures(context: Context) -> typing.Sequence[str]:
    all_fetched = False
    before = None
    signature_results: typing.List[str] = []
    while not all_fetched:
        signatures = context.client.get_confirmed_signatures_for_address2(
            context.group_address, before=before
        )
        signature_results += signatures
        if len(signatures) == 0:
            all_fetched = True
        else:
            before = signature_results[-1]

    return signature_results


def mango_instruction_from_response(
    context: Context,
    all_accounts: typing.Sequence[PublicKey],
    instruction_data: typing.Dict[str, typing.Any],
) -> typing.Optional["MangoInstruction"]:
    program_account_index = instruction_data["programIdIndex"]
    program_account: PublicKey = all_accounts[program_account_index]
    if program_account != context.mango_program_address:
        # It's an instruction, it's just not a Mango one.
        return None

    data = instruction_data["data"]
    instructions_account_indices = instruction_data["accounts"]

    decoded = base58.b58decode(data)
    initial = layouts.MANGO_INSTRUCTION_VARIANT_FINDER.parse(decoded)
    parser = layouts.InstructionParsersByVariant[initial.variant]
    if parser is None:
        logging.warning(
            f"Could not find instruction parser for variant {initial.variant} / {InstructionType(initial.variant)}."
        )
        return None

    # A whole bunch of accounts are listed for a transaction. Some (or all) of them apply
    # to this instruction. The instruction data gives the index of each account it uses,
    # in the order in which it uses them. So, for example, if it uses 3 accounts, the
    # instruction data could say [3, 2, 14], meaning the first account it uses is index 3
    # in the whole transaction account list, the second is index 2 in the whole transaction
    # account list, the third is index 14 in the whole transaction account list.
    accounts: typing.List[PublicKey] = []
    for index in instructions_account_indices:
        accounts += [all_accounts[index]]

    parsed = parser.parse(decoded)
    instruction_type = InstructionType(int(parsed.variant))

    return MangoInstruction(
        program_account, instruction_type, decoded, parsed, accounts
    )
