import json
import logging
from typing import Dict, List, Optional

from moonstreamdb.blockchain import AvailableBlockchainType, get_label_model
from moonstreamdb.models import Base
from moonworm.crawler.function_call_crawler import ContractFunctionCall  # type: ignore
from sqlalchemy import Integer, String, column, exists, func, select, text, values
from sqlalchemy.orm import Session

from ..settings import CRAWLER_LABEL
from .event_crawler import Event

logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)


def _event_to_label(
    blockchain_type: AvailableBlockchainType, event: Event, label_name=CRAWLER_LABEL
) -> Base:
    """
    Creates a label model.
    """
    label_model = get_label_model(blockchain_type)
    sanityzed_label_data = json.loads(
        json.dumps(
            {
                "type": "event",
                "name": event.event_name,
                "args": event.args,
            }
        ).replace(r"\u0000", "")
    )

    label = label_model(
        label=label_name,
        label_data=sanityzed_label_data,
        address=event.address,
        block_number=event.block_number,
        block_timestamp=event.block_timestamp,
        transaction_hash=event.transaction_hash,
        log_index=event.log_index,
    )
    return label


def _function_call_to_label(
    blockchain_type: AvailableBlockchainType,
    function_call: ContractFunctionCall,
    label_name=CRAWLER_LABEL,
) -> Base:
    """
    Creates a label model.
    """
    label_model = get_label_model(blockchain_type)

    sanityzed_label_data = json.loads(
        json.dumps(
            {
                "type": "tx_call",
                "name": function_call.function_name,
                "caller": function_call.caller_address,
                "args": function_call.function_args,
                "status": function_call.status,
                "gasUsed": function_call.gas_used,
            }
        ).replace(r"\u0000", "")
    )

    label = label_model(
        label=label_name,
        label_data=sanityzed_label_data,
        address=function_call.contract_address,
        block_number=function_call.block_number,
        transaction_hash=function_call.transaction_hash,
        block_timestamp=function_call.block_timestamp,
    )

    return label


def get_last_labeled_block_number(
    db_session: Session,
    blockchain_type: AvailableBlockchainType,
    label_name=CRAWLER_LABEL,
) -> Optional[int]:
    label_model = get_label_model(blockchain_type)
    block_number = (
        db_session.query(label_model.block_number)
        .filter(label_model.label == label_name)
        .order_by(label_model.block_number.desc())
        .limit(1)
        .one_or_none()
    )

    return block_number[0] if block_number else None


def get_first_labeled_block_number(
    db_session: Session,
    blockchain_type: AvailableBlockchainType,
    address: str,
    label_name=CRAWLER_LABEL,
    only_events: bool = False,
) -> Optional[int]:
    label_model = get_label_model(blockchain_type)
    block_number_query = (
        db_session.query(label_model.block_number)
        .filter(label_model.label == label_name)
        .filter(label_model.address == address)
    )

    function_call_block_numbers = (
        block_number_query.filter(label_model.log_index == None)
        .order_by(label_model.block_number)
        .limit(50)
        .all()
    )
    event_block_numbers = (
        block_number_query.filter(label_model.log_index != None)
        .order_by(label_model.block_number)
        .limit(50)
        .all()
    )

    if only_events:
        return event_block_numbers[0][0] if event_block_numbers else None
    else:
        event_block_number = event_block_numbers[0][0] if event_block_numbers else -1
        function_call_block_number = (
            function_call_block_numbers[0][0] if function_call_block_numbers else -1
        )
        max_block_number = max(event_block_number, function_call_block_number)
        return max_block_number if max_block_number != -1 else None


def commit_session(db_session: Session) -> None:
    """
    Save labels in the database.
    """
    try:
        logger.info("Committing session to database")
        db_session.commit()
    except Exception as e:
        logger.error(f"Failed to save labels: {e}")
        db_session.rollback()
        raise e


def add_events_to_session(
    db_session: Session,
    events: List[Event],
    blockchain_type: AvailableBlockchainType,
    label_name=CRAWLER_LABEL,
) -> None:

    if len(events) == 0:
        return

    label_model = get_label_model(blockchain_type)

    events_hashes_to_save = set([event.transaction_hash for event in events])

    # Define a CTE VALUES expression to escape big IN clause
    hashes_cte = select(
        values(column("transaction_hash", String), name="hashes").data(
            [(hash,) for hash in events_hashes_to_save]
        )
    ).cte()

    # Retrieve existing transaction hashes and registered log indexes
    query = (
        db_session.query(
            label_model.transaction_hash.label("transaction_hash"),
            func.array_agg(label_model.log_index).label("log_indexes"),
        )
        .filter(
            label_model.label == label_name,
            label_model.log_index.isnot(None),
            exists().where(
                label_model.transaction_hash == hashes_cte.c.transaction_hash
            ),
        )
        .group_by(label_model.transaction_hash)
    )

    existing_log_index_by_tx_hash = {
        row.transaction_hash: row.log_indexes for row in query
    }

    labels_to_save = [
        _event_to_label(blockchain_type, event, label_name)
        for event in events
        if event.transaction_hash not in existing_log_index_by_tx_hash
        or event.log_index not in existing_log_index_by_tx_hash[event.transaction_hash]
    ]

    logger.info(f"Saving {len(labels_to_save)} event labels to session")
    db_session.add_all(labels_to_save)


def add_function_calls_to_session(
    db_session: Session,
    function_calls: List[ContractFunctionCall],
    blockchain_type: AvailableBlockchainType,
    label_name=CRAWLER_LABEL,
) -> None:

    if len(function_calls) == 0:
        return

    label_model = get_label_model(blockchain_type)

    transactions_hashes_to_save = list(
        set([function_call.transaction_hash for function_call in function_calls])
    )

    # Define a CTE VALUES expression to escape big IN clause
    hashes_cte = select(
        values(column("transaction_hash", String), name="hashes").data(
            [(hash,) for hash in transactions_hashes_to_save]
        )
    ).cte()

    # Retrieve existing transaction hashes
    query = db_session.query(
        label_model.transaction_hash.label("transaction_hash")
    ).filter(
        label_model.label == label_name,
        label_model.log_index.is_(None),
        exists().where(label_model.transaction_hash == hashes_cte.c.transaction_hash),
    )

    existing_tx_hashes = [row.transaction_hash for row in query]

    labels_to_save = [
        _function_call_to_label(blockchain_type, function_call)
        for function_call in function_calls
        if function_call.transaction_hash not in existing_tx_hashes
    ]

    logger.info(f"Saving {len(labels_to_save)} labels to session")
    db_session.add_all(labels_to_save)