from redis import asyncio as aioredis

from core.util import logs

log = logs.get_logger("db")

r = aioredis.from_url("redis://redis:6379", db=0)


def convert(data):
    """
    Recursively convert a dictionary.
    """
    if isinstance(data, bytes):
        return data.decode("ascii")
    if isinstance(data, dict):
        return dict(map(convert, data.items()))
    if isinstance(data, tuple):
        return map(convert, data)
    if isinstance(data, list):
        return list(map(convert, data))
    return data


async def get_refs():
    """
    Get all reference IDs for trades.
    :return: list of trade IDs
    :rtype: list
    """
    references = []
    ref_keys = await r.keys("trade.*.reference")
    for key in ref_keys:
        key_data = await r.get(key)
        references.append(key_data)
    return convert(references)


async def tx_to_ref(tx):
    """
    Convert a trade ID to a reference.
    :param tx: trade ID
    :type tx: string
    :return: reference
    :rtype: string
    """
    refs = await get_refs()
    for reference in refs:
        ref_data = await r.hgetall(f"trade.{reference}")
        ref_data = convert(ref_data)
        if not ref_data:
            continue
        if ref_data["id"] == tx:
            return reference


async def ref_to_tx(reference):
    """
    Convert a reference to a trade ID.
    :param reference: trade reference
    :type reference: string
    :return: trade ID
    :rtype: string
    """
    ref_data = convert(await r.hgetall(f"trade.{reference}"))
    if not ref_data:
        return False
    return ref_data["id"]


async def get_ref_map():
    """
    Get all reference IDs for trades.
    :return: dict of references keyed by TXID
    :rtype: dict
    """
    references = {}
    ref_keys = await r.keys("trade.*.reference")
    for key in ref_keys:
        tx = convert(key).split(".")[1]
        references[tx] = await r.get(key)
    return convert(references)


async def get_ref(reference):
    """
    Get the trade information for a reference.
    :param reference: trade reference
    :type reference: string
    :return: dict of trade information
    :rtype: dict
    """
    ref_data = await r.hgetall(f"trade.{reference}")
    ref_data = convert(ref_data)
    if "subclass" not in ref_data:
        ref_data["subclass"] = "agora"
    if not ref_data:
        return False
    return ref_data


async def get_tx(tx):
    """
    Get the transaction information for a transaction ID.
    :param reference: trade reference
    :type reference: string
    :return: dict of trade information
    :rtype: dict
    """
    tx_data = await r.hgetall(f"tx.{tx}")
    tx_data = convert(tx_data)
    if not tx_data:
        return False
    return tx_data


async def get_subclass(reference):
    obj = await r.hget(f"trade.{reference}", "subclass")
    subclass = convert(obj)
    return subclass


async def del_ref(reference):
    """
    Delete a given reference from the Redis database.
    :param reference: trade reference to delete
    :type reference: string
    """
    tx = await ref_to_tx(reference)
    await r.delete(f"trade.{reference}")
    await r.delete(f"trade.{tx}.reference")


async def cleanup(subclass, references):
    """
    Reconcile the internal reference database with a given list of references.
    Delete all internal references not present in the list and clean up artifacts.
    :param references: list of references to reconcile against
    :type references: list
    """
    messages = []
    ref_map = await get_ref_map()
    for tx, reference in ref_map.items():
        if reference not in references:
            if await get_subclass(reference) == subclass:
                logmessage = (
                    f"[{reference}] ({subclass}): Archiving trade reference. TX: {tx}"
                )
                messages.append(logmessage)
                log.info(logmessage)
                await r.rename(f"trade.{tx}.reference", f"archive.trade.{tx}.reference")
                await r.rename(f"trade.{reference}", f"archive.trade.{reference}")
    return messages


async def find_trade(self, txid, currency, amount):
    """
    Get a trade reference that matches the given currency and amount.
    Only works if there is one result.
    :param txid: Sink transaction ID
    :param currency: currency
    :param amount: amount
    :type txid: string
    :type currency: string
    :type amount: int
    :return: matching trade object or False
    :rtype: dict or bool
    """
    refs = await get_refs()
    matching_refs = []
    # TODO: use get_ref_map in this function instead of calling get_ref multiple times
    for ref in refs:
        stored_trade = await get_ref(ref)
        if stored_trade["currency"] == currency and float(
            stored_trade["amount"]
        ) == float(amount):
            matching_refs.append(stored_trade)
    if len(matching_refs) != 1:
        log.error(
            f"Find trade returned multiple results for TXID {txid}: {matching_refs}"
        )
        return False
    return matching_refs[0]