# -*- coding: utf-8 -*-
import StringIO
import hashlib
import os
import os.path
import zlib
import datetime

class Object :
    
    ##
    # Save the object on the disk.
    def save( self ) :
        header = "author " + self.author + "\n"
        header += "parent " + self.parent + "\n"
        header += "created " + self.created + "\n"
        header += "#\n" #end of header
        store = header + self.content
        
        # if object was never stored, it doesn't have a name attribute
        # so we hash it contents
        if not hasattr( self, "name" ) :
            self.name = hashlib.sha1( store ).hexdigest()

        path = self.name[:2] + '/' + self.name[2:]

        if ( not os.path.exists( self.name[:2] ) ) :
            os.mkdir( self.name[:2] )

        if ( not os.path.exists( path ) ) :
            os.mkdir( path )

        file = open( path + "/object", 'w' )
        file.write( zlib.compress( store ) )
        file.close()
        return self.name
    
    ##
    # Class constructor.
    def __init__( self, author = None, parent = None, content = None ) :
        self.author = str(author)
        self.parent = str(parent)
        self.created = str( datetime.datetime.now() )
        self.content = str(content)
        self.name = hashlib.sha1( self.author + self.parent + self.created ).hexdigest()
    
    ##
    # Create an object from a file object
    # @param name The name of the object to load
    @staticmethod  
    def load( name ) :
        result = Object()
        path = name[:2] + '/' + name[2:] + '/object'
            
        if ( os.path.exists( path ) ) :
            
            file = open( name[:2] + '/' + name[2:] + '/object','r')
            contentStream = StringIO.StringIO( zlib.decompress( file.read() ) )
            
            for line in contentStream :

                if ( line == "#\n") :
                    result.content = contentStream.read()
                    break

                key, sep, value = line.rstrip('\n').partition(' ')
                setattr(result, key, value)
                
        return result
                    
    def appendTo(self) :
        pass
        
    def appendChild(self, child) :
        if not hasattr(self, "name") :
            pass
        
        if child.parent != self.name :
            pass
        
        if ( not os.path.exists( self.name[:2] ) ) :
            os.mkdir( self.name[:2] )

        if ( not os.path.exists( path ) ) :
            os.mkdir( path )

        file = open( path + "/childs", 'w+' )
        file.write( child.name )
        file.close()
        
        
            
    
if __name__== '__main__' :
    x = Object("test parent", "test author")
    name = x.save()
    
    y = Object.load(name)
    print y.author
    print y.parent
    print y.content
    print y.created