import asyncio
import logging
from typing import List, Optional

from sqlalchemy import orm
from web3 import Web3

from mev_inspect.fees import fetch_base_fee_per_gas
from mev_inspect.schemas.blocks import Block
from mev_inspect.schemas.receipts import Receipt
from mev_inspect.schemas.traces import Trace, TraceType
from mev_inspect.utils import RPCType, hex_to_int

logger = logging.getLogger(__name__)
_calltype_mapping = {
    "CALL": "call",
    "DELEGATECALL": "delegateCall",
    "CREATE": "create",
    "CREATE2": "create2",
    "SUICIDE": "suicide",
    "REWARD": "reward",
}


async def get_latest_block_number(base_provider) -> int:
    latest_block = await base_provider.make_request(
        "eth_getBlockByNumber",
        ["latest", False],
    )

    return hex_to_int(latest_block["result"]["number"])


async def create_from_block_number(
    w3: Web3,
    type: RPCType,
    block_number: int,
    trace_db_session: Optional[orm.Session],
) -> Block:
    
    if type == RPCType.geth:
        block_json = await w3.eth.get_block(block_number)
    else:
        block_json = dict()

    block_timestamp, receipts, traces, base_fee_per_gas = await asyncio.gather(
        _find_or_fetch_block_timestamp(w3, block_number, trace_db_session),
        _find_or_fetch_block_receipts(w3, block_number, trace_db_session, type, block_json),
        _find_or_fetch_block_traces(w3, block_number, trace_db_session, type, block_json),
        _find_or_fetch_base_fee_per_gas(w3, block_number, trace_db_session),
    )
    
    miner_address = _get_miner_address_from_traces(traces) if type == RPCType.parity else block_json.miner

    return Block(
        block_number=block_number,
        block_timestamp=block_timestamp,
        miner=miner_address,
        base_fee_per_gas=base_fee_per_gas,
        traces=traces,
        receipts=receipts,
    )


async def _find_or_fetch_block_timestamp(
    w3,
    block_number: int,
    trace_db_session: Optional[orm.Session],
) -> int:
    if trace_db_session is not None:
        existing_block_timestamp = _find_block_timestamp(trace_db_session, block_number)
        if existing_block_timestamp is not None:
            return existing_block_timestamp
    
    return await _fetch_block_timestamp(w3, block_number) 


async def _find_or_fetch_block_receipts(
    w3,
    block_number: int,
    trace_db_session: Optional[orm.Session],
    type: RPCType,
    block_json: dict
) -> List[Receipt]:
    if trace_db_session is not None:
        existing_block_receipts = _find_block_receipts(trace_db_session, block_number)
        if existing_block_receipts is not None:
            return existing_block_receipts

    if type == RPCType.geth:
        geth_tx_receipts = await geth_get_tx_receipts_async(
            w3.provider, block_json["transactions"]
        )
        receipts = geth_receipts_translator(block_json, geth_tx_receipts)
        return receipts

    return await _fetch_block_receipts(w3, block_number)


async def _find_or_fetch_block_traces(
    w3,
    block_number: int,
    trace_db_session: Optional[orm.Session],
    type: RPCType,
    block_json: dict
) -> List[Trace]:
    if trace_db_session is not None:
        existing_block_traces = _find_block_traces(trace_db_session, block_number)
        if existing_block_traces is not None:
            return existing_block_traces
	
    if type == RPCType.geth:
        #  Translate to parity format
        traces = await geth_get_tx_traces_parity_format(w3.provider, block_json)
        return traces

    return await _fetch_block_traces(w3, block_number)


async def _find_or_fetch_base_fee_per_gas(
    w3,
    block_number: int,
    trace_db_session: Optional[orm.Session],
) -> int:
    if trace_db_session is not None:
        existing_base_fee_per_gas = _find_base_fee_per_gas(
            trace_db_session, block_number
        )
        if existing_base_fee_per_gas is not None:
            return existing_base_fee_per_gas

    return await fetch_base_fee_per_gas(w3, block_number)


async def _fetch_block_timestamp(w3, block_number: int) -> int:
    block_json = await w3.eth.get_block(block_number)
    return block_json["timestamp"]


async def _fetch_block_receipts(w3, block_number: int) -> List[Receipt]:
    receipts_json = await w3.eth.get_block_receipts(block_number)
    return [Receipt(**receipt) for receipt in receipts_json]


async def _fetch_block_traces(w3, block_number: int) -> List[Trace]:
    traces_json = await w3.eth.trace_block(block_number)
    return [Trace(**trace_json) for trace_json in traces_json]


def _find_block_timestamp(
    trace_db_session: orm.Session,
    block_number: int,
) -> Optional[int]:
    result = trace_db_session.execute(
        "SELECT block_timestamp FROM block_timestamps WHERE block_number = :block_number",
        params={"block_number": block_number},
    ).one_or_none()

    if result is None:
        return None
    else:
        (block_timestamp,) = result
        return block_timestamp


def _find_block_traces(
    trace_db_session: orm.Session,
    block_number: int,
) -> Optional[List[Trace]]:
    result = trace_db_session.execute(
        "SELECT raw_traces FROM block_traces WHERE block_number = :block_number",
        params={"block_number": block_number},
    ).one_or_none()

    if result is None:
        return None
    else:
        (traces_json,) = result
        return [Trace(**trace_json) for trace_json in traces_json]


def _find_block_receipts(
    trace_db_session: orm.Session,
    block_number: int,
) -> Optional[List[Receipt]]:
    result = trace_db_session.execute(
        "SELECT raw_receipts FROM block_receipts WHERE block_number = :block_number",
        params={"block_number": block_number},
    ).one_or_none()

    if result is None:
        return None
    else:
        (receipts_json,) = result
        return [Receipt(**receipt) for receipt in receipts_json]


def _find_base_fee_per_gas(
    trace_db_session: orm.Session,
    block_number: int,
) -> Optional[int]:
    result = trace_db_session.execute(
        "SELECT base_fee_in_wei FROM base_fee WHERE block_number = :block_number",
        params={"block_number": block_number},
    ).one_or_none()

    if result is None:
        return None
    else:
        (base_fee,) = result
        return base_fee


def _get_miner_address_from_traces(traces: List[Trace]) -> Optional[str]:
    for trace in traces:
        if trace.type == TraceType.reward:
            return trace.action["author"]

    return None


def get_transaction_hashes(calls: List[Trace]) -> List[str]:
    result = []

    for call in calls:
        if call.type != TraceType.reward:
            if (
                call.transaction_hash is not None
                and call.transaction_hash not in result
            ):
                result.append(call.transaction_hash)

    return result


# Geth specific additions


async def geth_get_tx_traces_parity_format(base_provider, block_json: dict):
    # print(block_json['hash'].hex())
    block_hash = block_json["hash"]
    block_trace = await geth_get_tx_traces(base_provider, block_hash)
    # print(block_trace)
    parity_traces = []
    for idx, trace in enumerate(block_trace["result"]):
        if "result" in trace:
            parity_traces.extend(
                unwrap_tx_trace_for_parity(block_json, idx, trace["result"])
            )
    return parity_traces


async def geth_get_tx_traces(base_provider, block_hash):
    block_trace = await base_provider.make_request(
        "debug_traceBlockByHash", [block_hash.hex(), {"tracer": "callTracer"}]
    )
    return block_trace


def unwrap_tx_trace_for_parity(
    block_json, tx_pos_in_block, tx_trace, position=[]
) -> List[Trace]:
    response_list = []
    try:
        if tx_trace["type"] == "STATICCALL":
            return []
        action_dict = dict()
        action_dict["callType"] = _calltype_mapping[tx_trace["type"]]
        if action_dict["callType"] == "call":
            action_dict["value"] = tx_trace["value"]
        for key in ["from", "to", "gas", "input"]:
            action_dict[key] = tx_trace[key]

        result_dict = dict()
        result_dict["gasUsed"] = tx_trace["gasUsed"]
        if "output" in tx_trace.keys():
            result_dict["output"] = tx_trace["output"]

        response_list.append(
            Trace(
                action=action_dict,
                block_hash=str(block_json["hash"]),
                block_number=int(block_json["number"]),
                result=result_dict,
                subtraces=len(tx_trace["calls"]) if "calls" in tx_trace.keys() else 0,
                trace_address=position,
                transaction_hash=block_json["transactions"][tx_pos_in_block].hex(),
                transaction_position=tx_pos_in_block,
                type=TraceType(_calltype_mapping[tx_trace["type"]]),
            )
        )
    except Exception as e:
        breakpoint()
        logger.warn(f"error while unwraping tx trace for parity {e}")
        return []

    if "calls" in tx_trace.keys():
        for idx, subcall in enumerate(tx_trace["calls"]):
            response_list.extend(
                unwrap_tx_trace_for_parity(
                    block_json, tx_pos_in_block, subcall, position + [idx]
                )
            )
    return response_list


async def geth_get_tx_receipts_task(base_provider, tx):
    receipt = await base_provider.make_request("eth_getTransactionReceipt", [tx.hex()])
    return receipt


async def geth_get_tx_receipts_async(base_provider, transactions):
    geth_tx_receipts = []
    tasks = [
        asyncio.create_task(geth_get_tx_receipts_task(base_provider, tx))
        for tx in transactions
    ]
    geth_tx_receipts = await asyncio.gather(*tasks)
    # return [json.loads(tx_receipts) for tx_receipts in geth_tx_receipts]
    return geth_tx_receipts


def geth_receipts_translator(block_json, geth_tx_receipts) -> List[Receipt]:
    json_decoded_receipts = [
        tx_receipt["result"]
        if tx_receipt != None and ("result" in tx_receipt.keys())
        else None
        for tx_receipt in geth_tx_receipts
    ]
    results = []
    for idx, tx_receipt in enumerate(json_decoded_receipts):
        if tx_receipt != None:
            results.append(unwrap_tx_receipt_for_parity(block_json, idx, tx_receipt))
    return results


def unwrap_tx_receipt_for_parity(block_json, tx_pos_in_block, tx_receipt) -> Receipt:
    if tx_pos_in_block != int(tx_receipt["transactionIndex"], 16):
        logger.info(
            "Alert the position of transaction in block is mismatched ",
            tx_pos_in_block,
            tx_receipt["transactionIndex"],
        )
    return Receipt(
        block_number=block_json["number"],
        transaction_hash=tx_receipt["transactionHash"],
        transaction_index=tx_pos_in_block,
        gas_used=tx_receipt["gasUsed"],
        effective_gas_price=tx_receipt["effectiveGasPrice"],
        cumulative_gas_used=tx_receipt["cumulativeGasUsed"],
        to=tx_receipt["to"],
    )