from __future__ import unicode_literals

from .common import FileDownloader
from .external import get_external_downloader
from .f4m import F4mFD
from .hls import HlsFD
from .hls import NativeHlsFD
from .http import HttpFD
from .rtsp import RtspFD
from .rtmp import RtmpFD

from ..utils import (
    determine_protocol,
)

PROTOCOL_MAP = {
    'rtmp': RtmpFD,
    'm3u8_native': NativeHlsFD,
    'm3u8': HlsFD,
    'mms': RtspFD,
    'rtsp': RtspFD,
    'f4m': F4mFD,
}


def get_suitable_downloader(info_dict, params={}):
    """Get the downloader class that can handle the info dict."""
    protocol = determine_protocol(info_dict)
    info_dict['protocol'] = protocol

    external_downloader = params.get('external_downloader')
    if external_downloader is not None:
        ed = get_external_downloader(external_downloader)
        if ed.supports(info_dict):
            return ed

    if protocol == 'm3u8' and params.get('hls_prefer_native'):
        return NativeHlsFD

    return PROTOCOL_MAP.get(protocol, HttpFD)


__all__ = [
    'get_suitable_downloader',
    'FileDownloader',
]
