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#!/usr/bin/env python
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# Copyright 2012-2013 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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class History(object):
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    def __init__(self, filepath):
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        self.filepath = filepath
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    @classmethod
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    def _match(self, line, match_terms):
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        if match_terms is None:
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            return True
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        for term in match_terms.split():
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            if term not in line:
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                return False
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        return True
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    def get(self, match_terms=None, limit=0):
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        f = open(self.filepath, 'r')
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        result = ['%s.  \t%s' % (index + 1, line)\
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            for index, line in enumerate(f.readlines())\
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            if self._match(line, match_terms)]
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        offset = len(result) - limit if limit and len(result) > limit else 0
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        return result[offset:]
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    def add(self, line):
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        f = open(self.filepath, 'a+')
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        f.write(line + '\n')
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        f.close()
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    def clean(self):
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        f = open(self.filepath, 'w')
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        f.close()
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    def retrieve(self, cmd_id):
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        """
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        :param cmd_id: (int) the id of the command to retrieve can be positive
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            or negative, zero values are ignored
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        :returns: (str) the stored command record without the id
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        """
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        cmd_id = int(cmd_id)
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        if not cmd_id:
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            return None
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        with open(self.filepath) as f:
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            try:
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                cmd_list = f.readlines()[:-1]  # exclude current command
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                return cmd_list[cmd_id - (1 if cmd_id > 0 else 0)]
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            except IndexError:
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                return None