# package.py - apt package abstraction
#  
#  Copyright (c) 2005 Canonical
#  
#  Author: Michael Vogt <michael.vogt@ubuntu.com>
# 
#  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 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

import apt_pkg, string
import random

class Package(object):
    """ This class represents a package in the cache
    """
    def __init__(self, cache, depcache, records, pcache, pkgiter):
        """ Init the Package object """
        self._cache = cache             # low level cache
        self._depcache = depcache
        self._records = records
        self._pkg = pkgiter
        self._pcache = pcache           # python cache in cache.py
        pass

    # helper
    def _lookupRecord(self, UseCandidate=True):
        """ internal helper that moves the Records to the right
            position, must be called before _records is accessed """
        if UseCandidate:
            ver = self._depcache.GetCandidateVer(self._pkg)
        else:
            ver = self._pkg.CurrentVer

        # check if we found a version
        if ver == None:
            print "No version for: %s (Candiate: %s)" % (self._pkg.Name, UseCandidate)
            return False
        
        if ver.FileList == None:
            print "No FileList for: %s " % self._pkg.Name()
            return False
        file, index = ver.FileList.pop(0)
        self._records.Lookup((file,index))
        return True


    # basic information (implemented as properties)

    # FIXME once python2.3 is dropped we can use @property instead
    # of name = property(name)

    def name(self):
        """ Return the name of the package """
        return self._pkg.Name
    name = property(name)

    def id(self):
        """ Return a uniq ID for the pkg, can be used to store
            additional information about the pkg """
        return self._pkg.ID
    id = property(id)

    def installedVersion(self):
        """ Return the installed version as string """
        ver = self._pkg.CurrentVer
        if ver != None:
            return ver.VerStr
        else:
            return None
    installedVersion = property(installedVersion)

    def candidateVersion(self):
        """ Return the candidate version as string """
        ver = self._depcache.GetCandidateVer(self._pkg)
        if ver != None:
            return ver.VerStr
        else:
            return None
    candidateVersion = property(candidateVersion)

    def sourcePackageName(self):
        """ Return the source package name as string """
        self._lookupRecord()
        src = self._records.SourcePkg
        if src != "":
            return src
        else:
            return self._pkg.Name
    sourcePackageName = property(sourcePackageName)

    def section(self):
        """ Return the section of the package"""
        return self._pkg.Section
    section = property(section)

    def priority(self):
        """ Return the priority (of the candidate version)"""
        ver = self._depcache.GetCandidateVer(self._pkg)
        if ver:
            return ver.PriorityStr
        else:
            return None
    priority = property(priority)

    def installedPriority(self):
        """ Return the priority (of the installed version)"""
        ver = self._depcache.GetCandidateVer(self._pkg)
        if ver:
            return ver.PriorityStr
        else:
            return None
    installedPriority = property(installedPriority)

    def summary(self):
        """ Return the short description (one line summary) """
        self._lookupRecord()
        return self._records.ShortDesc
    summary = property(summary)

    def description(self, format=True):
        """ Return the formated long description """
        self._lookupRecord()
        desc = ""
        for line in string.split(self._records.LongDesc, "\n"):
                tmp = string.strip(line)
                if tmp == ".":
                    desc += "\n"
                else:
                    desc += tmp + "\n"
        return desc
    description = property(description)

    def rawDescription(self):
        """ return the long description (raw)"""
        self._lookupRecord()
        return self._records.LongDesc
    rawDescription = property(rawDescription)
        

    # depcache states
    def markedInstall(self):
        """ Package is marked for install """
        return self._depcache.MarkedInstall(self._pkg)
    markedInstall = property(markedInstall)

    def markedUpgrade(self):
        """ Package is marked for upgrade """
        return self._depcache.MarkedUpgrade(self._pkg)
    markedUpgrade = property(markedUpgrade)

    def markedDelete(self):
        """ Package is marked for delete """
        return self._depcache.MarkedDelete(self._pkg)
    markedDelete = property(markedDelete) 

    def markedKeep(self):
        """ Package is marked for keep """
        return self._depcache.MarkedKeep(self._pkg)
    markedKeep = property(markedKeep)

    def markedDowngrade(self):
        """ Package is marked for downgrade """
        return self._depcache.MarkedDowngrade(self._pkg)
    markedDowngrade = property(markedDowngrade)

    def markedReinstall(self):
        """ Package is marked for reinstall """
        return self._depcache.MarkedReinstall(self._pkg)
    markedReinstall = property(markedReinstall)

    def isInstalled(self):
        """ Package is installed """
        return (self._pkg.CurrentVer != None)
    isInstalled = property(isInstalled)

    def isUpgradable(self):
        """ Package is upgradable """    
        return self.isInstalled and self._depcache.IsUpgradable(self._pkg)
    isUpgradable = property(isUpgradable)

    # size
    def packageSize(self):
        """ The size of the candidate deb package """
        ver = self._depcache.GetCandidateVer(self._pkg)
        return ver.Size
    packageSize = property(packageSize)

    def installedPackageSize(self):
        """ The size of the installed deb package """
        ver = self._pkg.CurrentVer
        return ver.Size
    installedPackageSize = property(installedPackageSize)

    def candidateInstalledSize(self, UseCandidate=True):
        """ The size of the candidate installed package """
        ver = self._depcache.GetCandidateVer(self._pkg)
    candidateInstalledSize = property(candidateInstalledSize)

    def installedSize(self):
        """ The size of the currently installed package """
        ver = self._pkg.CurrentVer
        return ver.InstalledSize
    installedSize = property(installedSize)


    # depcache actions
    def markKeep(self):
        """ mark a package for keep """
        self._pcache.cachePreChange()
        self._depcache.MarkKeep(self._pkg)
        self._pcache.cachePostChange()
    def markDelete(self, autoFix=True):
        """ mark a package for delete. Run the resolver if autoFix is set """
        self._pcache.cachePreChange()
        self._depcache.MarkDelete(self._pkg)
        # try to fix broken stuffsta
        if autoFix and self._depcache.BrokenCount > 0:
            Fix = apt_pkg.GetPkgProblemResolver(self._depcache)
            Fix.Clear(self._pkg)
            Fix.Protect(self._pkg)
            Fix.Remove(self._pkg)
            Fix.InstallProtect()
            Fix.Resolve()
        self._pcache.cachePostChange()
    def markInstall(self, autoFix=True):
        """ mark a package for install. Run the resolver if autoFix is set """
        self._pcache.cachePreChange()
        self._depcache.MarkInstall(self._pkg)
        # try to fix broken stuff
        if autoFix and self._depcache.BrokenCount > 0:
            fixer = apt_pkg.GetPkgProblemResolver(self._depcache)
            fixer.Clear(self._pkg)
            fixer.Protect(self._pkg)
            fixer.Resolve(True)
        self._pcache.cachePostChange()
    def markUpgrade(self):
        """ mark a package for upgrade """
        if self.isUpgradable:
            self.MarkInstall()
        # FIXME: we may want to throw a exception here
        sys.stderr.write("MarkUpgrade() called on a non-upgrable pkg")

    def commit(self, fprogress, iprogress):
        """ commit the changes, need a FetchProgress and InstallProgress
            object as argument
        """
        self._depcache.Commit(fprogress, iprogress)
        

# self-test
if __name__ == "__main__":
    print "Self-test for the Package modul"
    apt_pkg.init()
    cache = apt_pkg.GetCache()
    depcache = apt_pkg.GetDepCache(cache)
    records = apt_pkg.GetPkgRecords(cache)

    iter = cache["apt-utils"]
    pkg = Package(cache, depcache, records, None, iter)
    print "Name: %s " % pkg.name
    print "ID: %s " % pkg.id
    print "Priority (Candidate): %s " % pkg.priority
    print "Priority (Installed): %s " % pkg.installedPriority
    print "Installed: %s " % pkg.installedVersion
    print "Candidate: %s " % pkg.candidateVersion
    print "SourcePkg: %s " % pkg.sourcePackageName
    print "Section: %s " % pkg.section
    print "Summary: %s" % pkg.summary
    print "Description (formated) :\n%s" % pkg.description
    print "Description (unformated):\n%s" % pkg.rawDescription
    print "InstalledSize: %s " % pkg.installedSize
    print "PackageSize: %s " % pkg.packageSize

    # now test install/remove
    import apt
    progress = apt.progress.OpTextProgress()
    cache = apt.Cache(progress)
    for i in [True, False]:
        print "Running install on random upgradable pkgs with AutoFix: %s " % i
        for name in cache.keys():
            pkg = cache[name]
            if pkg.isUpgradable:
                if random.randint(0,1) == 1:
                    pkg.markInstall(i)
        print "Broken: %s " % cache._depcache.BrokenCount
        print "InstCount: %s " % cache._depcache.InstCount

    print
    # get a new cache
    for i in [True, False]:
        print "Randomly remove some packages with AutoFix: %s" % i
        cache = apt.Cache(progress)
        for name in cache.keys():
            if random.randint(0,1) == 1:
                try:
                    cache[name].markDelete(i)
                except SystemError:
                    print "Error trying to remove: %s " % name
        print "Broken: %s " % cache._depcache.BrokenCount
        print "DelCount: %s " % cache._depcache.DelCount