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import yaml
import warnings

from .core import DownloadFailure
from .rosdistrohelper import PreRep137Warning
from .url_utils import urlopen_gzip

# location of targets file for processing gbpdistro files
REP3_TARGETS_URL = 'https://raw.githubusercontent.com/ros/rosdistro/master/releases/targets.yaml'

# seconds to wait before aborting download of gbpdistro data
DOWNLOAD_TIMEOUT = 15.0


def download_targets_data(targets_url=None):
    """
    Download REP 3 targets file and unmarshal from YAML.
    DEPRECATED: this function is deprecated. List of targets should be obtained
                from the rosdistro module.
                The body of this function is an example.

    :param target_url: override URL of platform targets file. Defaults
      to ``REP3_TARGETS_URL``.
    :raises: :exc:`DownloadFailure`
    :raises: :exc:`InvalidData` If targets file does not pass cursory validation checks.
    """
    warnings.warn('deprecated, use rosdistro instead', PreRep137Warning)

    if targets_url is None:
        targets_url = REP3_TARGETS_URL
    try:
        f = urlopen_gzip(targets_url, timeout=DOWNLOAD_TIMEOUT)
        text = f.read()
        f.close()
        targets_data = yaml.safe_load(text)
    except Exception as e:
        raise DownloadFailure('Failed to download target platform data for gbpdistro:\n\t%s' % (str(e)))
    if type(targets_data) is list:
        # convert to dictionary
        new_targets_data = {}
        for t in targets_data:
            platform = list(t.keys())[0]
            new_targets_data[platform] = t[platform]
        targets_data = new_targets_data
    return targets_data
