# author: Jonathan Dieter <jdieter@gmail.com>
# 
# format_number taken almost completely from progress_meter.py in yum
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Library General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
# Copyright 2005 Duke University
# Copyright 2007 Jonathan Dieter

import os
import deltarpm

def format_number(number, SI=False, space=''):
    """Turn numbers into human-readable metric-like numbers"""
    symbols = ['',  # (none)
                'K', # kilo
                'M', # mega
                'G', # giga
                'T', # tera
                'P', # peta
                'E', # exa
                'Z', # zetta
                'Y'] # yotta

    if SI: step = 1000.0
    else: step = 1024.0

    thresh = 999
    depth = 0

    # we want numbers between 
    while number > thresh:
        depth  = depth + 1
        number = number / step

    # just in case someone needs more than 1000 yottabytes!
    diff = depth - len(symbols) + 1
    if diff > 0:
        depth = depth - diff
        number = number * thresh**depth

    if type(number) == type(1) or type(number) == type(1L):
        format = '%i%s%s'
    elif number < 9.95:
        # must use 9.95 for proper sizing.  For example, 9.99 will be
        # rounded to 10.0 with the .1f format string (which is too long)
        format = '%.1f%s%s'
    else:
        format = '%.0f%s%s'

    return(format % (number, space, symbols[depth]))


def find_available_drpms(conduit, newpkg):
    """Find any applicable drpms for newpkg
       newpkg is a TransactionMember"""
    
    rpmdb = conduit.getRpmDB()
    
    is_local = False
    
    # Set p_repo to be packages delta repository or set to False if
    # there is no delta repository
    try:
        p_repo = newpkg.po.repo.p_repo
        drpm_enabled = p_repo.enabled

        po = newpkg.po
        if hasattr(po, 'pkgtype') and po.pkgtype == 'local':
            is_local = True
        else:
            local = po.localPkg()
            if os.path.exists(local):
                cursize = os.stat(local)[6]
                totsize = long(po.size)
                if not po.verifyLocalPkg():
                    if cursize >= totsize: # otherwise keep it around for regetting
                        os.unlink(local)
                else:
                    conduit.info(5, "using local copy of %s" % po)
                    is_local = True

    except:
        conduit.info(5, "No Presto repository information for %s.%s %i:%s-%s" % (newpkg.name, newpkg.arch, int(newpkg.epoch), newpkg.version, newpkg.release))
        drpm_enabled = False
        is_local = False
        
    chosen_drpm = None
    
    # First part of key when matching drpms
    key1 = "%s*%s*%i*%s*%s" % (newpkg.name, newpkg.arch, int(newpkg.epoch), newpkg.version, newpkg.release)
    
    # Find any installed packages that match the ones we want to download
    installed = rpmdb.searchNevra(newpkg.name, None, None, None, newpkg.arch)

    if installed == []:
        is_installed = False
    else:
        is_installed = True
        
    
    if is_installed and drpm_enabled and not is_local:
        for oldpkg in installed:
            # Generate second part of key for matching drpms, then full key
            key2 = "%s*%s*%i*%s*%s" % (oldpkg.name, oldpkg.arch, int(oldpkg.epoch), oldpkg.version, oldpkg.release)
            key = "%s!!%s" % (key1, key2)
            
            # Check whether we have a matching drpm
            if p_repo.deltalist.has_key(key):
                # Check whether or not we already have a matching drpm, then choose smallest of the two if we do
                if chosen_drpm == None or p_repo.deltalist[key]['size'] < chosen_drpm['size']:
                
                    # Get sequence code for drpm
                    sequence = p_repo.deltalist[key]['sequence']
#                    if int(oldpkg.epoch) == 0:  # Don't try to save space on sequence anymore.  It just won't work.
#                        seq = "%s-%s-%s-%s" % (oldpkg.name, oldpkg.version, oldpkg.release, sequence)
#                    else:
#                        seq = "%s-%i:%s-%s-%s" % (oldpkg.name, int(oldpkg.epoch), oldpkg.version, oldpkg.release, sequence)
                    drpm = deltarpm.DeltaRpmWrapper(conduit)
                    
                    # Attempt to apply sequence code for drpm. If this fails, drpm will not apply cleanly, so
                    # don't even try to download it.
                    try:
                        drpm.verifySequence(sequence)
                    except:
                        conduit.info(5, "Verification of %s failed" % seq)
                    else:
                        chosen_drpm = p_repo.deltalist[key]
                        chosen_drpm['baseurl'] = p_repo.baseurl[0]
                        newpkg.po.oldpkg_string = "%s.%s %s:%s-%s" % (oldpkg.name, oldpkg.arch, oldpkg.epoch, oldpkg.version, oldpkg.release)
                        newpkg.po.newpkg_string = "%s.%s %s:%s-%s" % (newpkg.name, newpkg.arch, newpkg.epoch, newpkg.version, newpkg.release)
        
    return (chosen_drpm, installed, is_local, drpm_enabled)