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from typing import AsyncGenerator

from servicex.servicex import StreamInfoUrl


class DataSource:
    def __init__(self, query, metadata={}, datasets=[]):
        self.query = query
        self.metadata = metadata
        self.schema = None
        self.datasets = datasets

    async def stream_result_file_urls(self) -> AsyncGenerator[StreamInfoUrl, None]:
        """Launch all datasources at once

        TODO: This is currently sync (that outter for loop does one datasource and then the next).
        Need to move to a different paradigm. Perhaps using the `aiostream` library.

        Yields:
            [type]: [description]
        """
        for dataset in self.datasets:
            async for file in dataset.get_data_rootfiles_url_stream(self.query.value()):
                yield file

    async def stream_result_files(self) -> AsyncGenerator[StreamInfoUrl, None]:
        """Launch all datasources at once

        TODO: This is currently sync (that outter for loop does one datasource and then the next).
        Need to move to a different paradigm. Perhaps using the `aiostream` library.

        Yields:
            [type]: [description]
        """
        for dataset in self.datasets:
            async for file in dataset.get_data_rootfiles_stream(self.query.value()):
                yield file
