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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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from collections import defaultdict
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from sqlalchemy import Table, Column, String, MetaData
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from sqlalchemy.sql import select, and_
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from sqlalchemy.schema import Index
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from dbworker import DBWorker
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class Groups(DBWorker):
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    """Groups are named collections of members, belonging to an owner."""
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    def __init__(self, **params):
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        DBWorker.__init__(self, **params)
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        metadata = MetaData()
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        columns=[]
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        columns.append(Column('owner', String(255), primary_key=True))
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        columns.append(Column('name', String(255), primary_key=True))
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        columns.append(Column('member', String(255), primary_key=True))
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        self.groups = Table('groups', metadata, *columns, mysql_engine='InnoDB')
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        # place an index on member
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        Index('idx_groups_member', self.groups.c.member)
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        metadata.create_all(self.engine)
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    def group_names(self, owner):
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        """List all group names belonging to owner."""
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        s = select([self.groups.c.name],
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            self.groups.c.owner==owner).distinct()
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        r = self.conn.execute(s)
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        l = [row[0] for row in r.fetchall()]
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        r.close()
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        return l
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    def group_dict(self, owner):
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        """Return a dict mapping group names to member lists for owner."""
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        s = select([self.groups.c.name, self.groups.c.member],
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            self.groups.c.owner==owner)
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        r = self.conn.execute(s)
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        d = defaultdict(list)
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        for group, member in r.fetchall():
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            d[group].append(member)
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        r.close()
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        return d
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    def group_add(self, owner, group, member):
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        """Add a member to a group."""
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        s = self.groups.select()
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        s = s.where(self.groups.c.owner == owner)
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        s = s.where(self.groups.c.name == group)
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        s = s.where(self.groups.c.member == member)
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        r = self.conn.execute(s)
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        groups = r.fetchall()
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        r.close()
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        if len(groups) == 0:    
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            s = self.groups.insert()
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            r = self.conn.execute(s, owner=owner, name=group, member=member)
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            r.close()
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    def group_addmany(self, owner, group, members):
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        """Add members to a group."""
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        #TODO: more efficient way to do it
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        for member in members:
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            self.group_add(owner, group, member)
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    def group_remove(self, owner, group, member):
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        """Remove a member from a group."""
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        s = self.groups.delete().where(and_(self.groups.c.owner==owner,
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                                            self.groups.c.name==group,
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                                            self.groups.c.member==member))
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        r = self.conn.execute(s)
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        r.close()
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    def group_delete(self, owner, group):
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        """Delete a group."""
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        s = self.groups.delete().where(and_(self.groups.c.owner==owner,
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                                            self.groups.c.name==group))
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        r = self.conn.execute(s)
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        r.close()
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    def group_destroy(self, owner):
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        """Delete all groups belonging to owner."""
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        s = self.groups.delete().where(self.groups.c.owner==owner)
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        r = self.conn.execute(s)
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        r.close()
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    def group_members(self, owner, group):
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        """Return the list of members of a group."""
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        s = select([self.groups.c.member], and_(self.groups.c.owner==owner,
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                                                self.groups.c.name==group))
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        r = self.conn.execute(s)
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        l = [row[0] for row in r.fetchall()]
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        r.close()
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        return l
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    def group_check(self, owner, group, member):
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        """Check if a member is in a group."""
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        s = select([self.groups.c.member], and_(self.groups.c.owner==owner,
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                           self.groups.c.name==group,
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                           self.groups.c.member==member))
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        r = self.conn.execute(s)
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        l = r.fetchone()
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        r.close()
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        return bool(l)
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    def group_parents(self, member):
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        """Return all (owner, group) tuples that contain member."""
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        s = select([self.groups.c.owner, self.groups.c.name],
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            self.groups.c.member==member)
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        r = self.conn.execute(s)
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        l = r.fetchall()
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        r.close()
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        return l