StellarCN/py-stellar-base

from ...asset import Asset
from ...call_builder.base.base_call_builder import BaseCallBuilder

__all__ = ["BaseTradeAggregationsCallBuilder"]


class BaseTradeAggregationsCallBuilder(BaseCallBuilder):
    """Creates a new :class:`TradeAggregationsCallBuilder` pointed to server defined by horizon_url.

    Trade Aggregations facilitate efficient gathering of historical trade data.

    See `List Trade Aggregations <https://developers.stellar.org/api/aggregations/trade-aggregations/list/>`__ for more information.

    :param base: base asset
    :param counter: counter asset
    :param resolution: segment duration as millis since epoch. *Supported values
        are 1 minute (60000), 5 minutes (300000), 15 minutes (900000),
        1 hour (3600000), 1 day (86400000) and 1 week (604800000).*
    :param start_time: lower time boundary represented as millis since epoch
    :param end_time: upper time boundary represented as millis since epoch
    :param offset: segments can be offset using this parameter.
        Expressed in milliseconds. *Can only be used if the resolution is greater than 1 hour.
        Value must be in whole hours, less than the provided resolution, and less than 24 hours.*
    :param horizon_url: Horizon server URL.
    """

    def __init__(
        self,
        base: Asset,
        counter: Asset,
        resolution: int,
        start_time: int = None,
        end_time: int = None,
        offset: int = None,
        **kwargs,
    ) -> None:
        super().__init__(**kwargs)
        self.endpoint: str = "trade_aggregations"

        if not self._is_valid_resolution(resolution):
            raise ValueError(f"Invalid resolution: {resolution}")

        if offset and not self._is_valid_offset(offset, resolution):
            raise ValueError(f"Invalid offset: {offset}")

        params = {
            "base_asset_type": base.type,
            "base_asset_code": None if base.is_native() else base.code,
            "base_asset_issuer": base.issuer,
            "counter_asset_type": counter.type,
            "counter_asset_code": None if counter.is_native() else counter.code,
            "counter_asset_issuer": counter.issuer,
            "start_time": start_time,
            "end_time": end_time,
            "resolution": resolution,
            "offset": offset,
        }
        self._add_query_params(params)

    def _is_valid_offset(self, offset: int, resolution: int) -> bool:
        """
        :param offset: Time offset in milliseconds
        :param resolution: Trade data resolution in milliseconds
        :return: `True` if the offset is allowed
        """
        hour = 3600000
        invalid = offset > resolution or offset >= 24 * hour or offset % hour != 0
        return not invalid

    def _is_valid_resolution(self, resolution: int) -> bool:
        """
        :param resolution: Trade data resolution in milliseconds
        :return: `True` if the resolution is allowed
        """
        allowed_resolutions = (60000, 300000, 900000, 3600000, 86400000, 604800000)
        if resolution in allowed_resolutions:
            return True
        return False