from __future__ import unicode_literals

from .common import FileDownloader
from .f4m import F4mFD
from .hls import HlsFD
from .http import HttpFD
from .rtmp import RtmpFD
from .dash import DashSegmentsFD
from .external import (
    get_external_downloader,
    FFmpegFD,
)

from ..utils import (
    determine_protocol,
)

PROTOCOL_MAP = {
    'rtmp': RtmpFD,
    'm3u8_native': HlsFD,
    'm3u8': FFmpegFD,
    'mms': FFmpegFD,
    'rtsp': FFmpegFD,
    'f4m': F4mFD,
    'http_dash_segments': DashSegmentsFD,
}


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

    if (info_dict.get('start_time') or info_dict.get('end_time')) and FFmpegFD.available() and FFmpegFD.supports(info_dict):
        return FFmpegFD

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

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

    return PROTOCOL_MAP.get(protocol, HttpFD)


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