import os
import asyncio
import typing
import logging
from lbrynet.extras.daemon.mime_types import guess_media_type
from lbrynet.stream.downloader import StreamDownloader
from lbrynet.stream.descriptor import StreamDescriptor
if typing.TYPE_CHECKING:
    from lbrynet.extras.daemon.storage import StoredStreamClaim
    from lbrynet.blob.blob_manager import BlobFileManager

log = logging.getLogger(__name__)


class ManagedStream:
    STATUS_RUNNING = "running"
    STATUS_STOPPED = "stopped"
    STATUS_FINISHED = "finished"

    def __init__(self, loop: asyncio.BaseEventLoop, blob_manager: 'BlobFileManager', descriptor: 'StreamDescriptor',
                 download_directory: str, file_name: str, downloader: typing.Optional[StreamDownloader] = None,
                 status: typing.Optional[str] = STATUS_STOPPED, claim: typing.Optional['StoredStreamClaim'] = None):
        self.loop = loop
        self.blob_manager = blob_manager
        self.download_directory = download_directory
        self.file_name = file_name
        self.descriptor = descriptor
        self.downloader = downloader
        self.stream_hash = descriptor.stream_hash
        self.stream_claim_info = claim
        self._status = status
        self._store_after_finished: asyncio.Task = None

    @property
    def status(self) -> str:
        return self._status

    def update_status(self, status: str):
        assert status in [self.STATUS_RUNNING, self.STATUS_STOPPED, self.STATUS_FINISHED]
        self._status = status

    @property
    def finished(self) -> bool:
        return self.status == self.STATUS_FINISHED

    @property
    def running(self) -> bool:
        return self.status == self.STATUS_RUNNING

    @property
    def claim_id(self) -> typing.Optional[str]:
        return None if not self.stream_claim_info else self.stream_claim_info.claim_id

    @property
    def txid(self) -> typing.Optional[str]:
        return None if not self.stream_claim_info else self.stream_claim_info.txid

    @property
    def nout(self) -> typing.Optional[int]:
        return None if not self.stream_claim_info else self.stream_claim_info.nout

    @property
    def outpoint(self) -> typing.Optional[str]:
        return None if not self.stream_claim_info else self.stream_claim_info.outpoint

    @property
    def claim_height(self) -> typing.Optional[int]:
        return None if not self.stream_claim_info else self.stream_claim_info.height

    @property
    def channel_claim_id(self) -> typing.Optional[str]:
        return None if not self.stream_claim_info else self.stream_claim_info.channel_claim_id

    @property
    def channel_name(self) -> typing.Optional[str]:
        return None if not self.stream_claim_info else self.stream_claim_info.channel_name

    @property
    def claim_name(self) -> typing.Optional[str]:
        return None if not self.stream_claim_info else self.stream_claim_info.claim_name

    @property
    def metadata(self) ->typing.Optional[typing.Dict]:
        return None if not self.stream_claim_info else self.stream_claim_info.claim.claim_dict['stream']['metadata']

    @property
    def blobs_completed(self) -> int:
        return sum([1 if self.blob_manager.get_blob(b.blob_hash).get_is_verified() else 0
                    for b in self.descriptor.blobs[:-1]])

    @property
    def blobs_in_stream(self) -> int:
        return len(self.descriptor.blobs) - 1

    @property
    def sd_hash(self):
        return self.descriptor.sd_hash

    def as_dict(self) -> typing.Dict:
        full_path = os.path.join(self.download_directory, self.file_name)
        if not os.path.exists(full_path):
            full_path = None
        mime_type = guess_media_type(os.path.basename(self.file_name))

        if self.downloader:
            written_bytes = self.downloader.written_bytes
        elif full_path:
            written_bytes = os.stat(full_path).st_size
        else:
            written_bytes = None
        return {
            'completed': self.finished,
            'file_name': self.file_name,
            'download_directory': self.download_directory,
            'points_paid': 0.0,
            'stopped': not self.running,
            'stream_hash': self.stream_hash,
            'stream_name': self.descriptor.stream_name,
            'suggested_file_name': self.descriptor.suggested_file_name,
            'sd_hash': self.descriptor.sd_hash,
            'download_path': full_path,
            'mime_type': mime_type,
            'key': self.descriptor.key,
            'total_bytes_lower_bound': self.descriptor.lower_bound_decrypted_length(),
            'total_bytes': self.descriptor.upper_bound_decrypted_length(),
            'written_bytes': written_bytes,
            'blobs_completed': self.blobs_completed,
            'blobs_in_stream': self.blobs_in_stream,
            'status': self.status,
            'claim_id': self.claim_id,
            'txid': self.txid,
            'nout': self.nout,
            'outpoint': self.outpoint,
            'metadata': self.metadata,
            'channel_claim_id': self.channel_claim_id,
            'channel_name': self.channel_name,
            'claim_name': self.claim_name
        }

    @classmethod
    async def create(cls, loop: asyncio.BaseEventLoop, blob_manager: 'BlobFileManager',
                     file_path: str) -> 'ManagedStream':
        descriptor = await StreamDescriptor.create_stream(
            loop, blob_manager.blob_dir, file_path
        )
        sd_blob = blob_manager.get_blob(descriptor.sd_hash)
        await blob_manager.blob_completed(sd_blob)
        await blob_manager.storage.store_stream(
            blob_manager.get_blob(descriptor.sd_hash), descriptor
        )
        return cls(loop, blob_manager, descriptor, os.path.dirname(file_path), os.path.basename(file_path),
                   status=cls.STATUS_FINISHED)

    async def stop_download(self):
        if self.downloader:
            await self.downloader.stop()
        if not self.finished:
            self.update_status(self.STATUS_STOPPED)