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# Copyright 2011-2012 GRNET S.A. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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#
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#   1. Redistributions of source code must retain the above
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#      copyright notice, this list of conditions and the following
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#      disclaimer.
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#
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#   2. Redistributions in binary form must reproduce the above
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#      copyright notice, this list of conditions and the following
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#      disclaimer in the documentation and/or other materials
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#      provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and
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# documentation are those of the authors and should not be
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# interpreted as representing official policies, either expressed
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# or implied, of GRNET S.A.
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def _matches(val1, val2, exactMath=True):
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    """Case Insensitive match"""
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    if exactMath:
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        return True if val1.lower() == val2.lower() else False
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    else:
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        return True if val1.lower().startswith(val2.lower()) else False
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def filter_out(d, prefix, exactMatch=False):
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    """Remove entries that are prefixed with prefix (case insensitive)
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    :param d: (dict) input
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    :param prefix: (str) prefix to match input keys against
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    :param exactMatch: (bool) key should fully match if True, just prefixed
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        with prefix if False
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    :returns: (dict) the updated d
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    """
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    ret = {}
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    for key, val in d.items():
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        if not _matches(key, prefix, exactMath=exactMatch):
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            ret[key] = val
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    return ret
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def filter_in(d, prefix, exactMatch=False):
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    """Keep only entries of d prefixed with prefix
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    :param d: (dict) input
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    :param prefix: (str) prefix to match input keys against
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    :param exactMatch: (bool) key should fully match if True, just prefixed
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        with prefix if False
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    :returns: (dict) the updated d
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    """
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    ret = {}
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    for key, val in d.items():
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        if _matches(key, prefix, exactMath=exactMatch):
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            ret[key] = val
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    return ret
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def path4url(*args):
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    """
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    :param args: (list of str)
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    :returns: (str) a path in the form /args[0]/args[1]/...
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    """
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    r = '/'.join([''] + [arg.decode('utf-8') if (
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        isinstance(arg, str)) else '%s' % arg for arg in args])
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    while '//' in r:
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        r = r.replace('//', '/')
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    return r
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def params4url(params):
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    """{'key1':'val1', 'key2':None, 'key3':15} --> "?key1=val1&key2&key3=15"
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    :param params: (dict) request parameters in the form key:val
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    :returns: (str) http-request friendly in the form ?key1=val1&key2=val2&...
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    """
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    assert(type(params) is dict)
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    result = ''
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    dlmtr = '?'
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    for name in params:
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        result = result + dlmtr + name
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        result += '=%s' % params[name] if params[name] else result
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        dlmtr = '&'
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    return result