#
# partIntfHelpers.py: partitioning interface helper functions
#
# Matt Wilson <msw@redhat.com>
# Jeremy Katz <katzj@redhat.com>
# Mike Fulbright <msf@redhat.com>
# Harald Hoyer <harald@redhat.de>
#
# Copyright 2002 Red Hat, Inc.
#
# This software may be freely redistributed under the terms of the GNU
# library public license.
#
# You should have received a copy of the GNU Library Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
"""Helper functions shared between partitioning interfaces."""

import string
from rhpl.translate import _
from constants import *
import partedUtils
import parted
import fsset
import iutil
import partRequests

def sanityCheckVolumeGroupName(volname):
    """Make sure that the volume group name doesn't contain invalid chars."""
    badNames = ['lvm']

    if not volname:
	return _("Please enter a volume group name.")

    # ripped the value for this out of linux/include/lvm.h
    if len(volname) > 128:
        return _("Volume Group Names must be less than 128 characters")

    if volname in badNames:
	return _("Error - the volume group name %s is not valid." % (volname,))

    if string.find(volname, '/') != -1 or string.find(volname, ' ') != -1:
	return _("Error - the volume group name contains illegal characters "
		 " or spaces.")
    return None

def sanityCheckLogicalVolumeName(logvolname):
    """Make sure that the logical volume name doesn't contain invalid chars."""
    badNames = ['group']
    
    if not logvolname:
	return _("Please enter a logical volume name.")

    # ripped the value for this out of linux/include/lvm.h
    if len(logvolname) > 128:
        return _("Logical Volume Names must be less than 128 characters")
    

    if logvolname in badNames:
	return _("Error - the logical volume name %s is not "
                 "valid." % (logvolname,))

    if (string.find(logvolname, '/') != -1 or
        string.find(logvolname, ' ') != -1):
	return _("Error - the logical volume name contains illegal "
                 "characters or spaces.")
    return None

def sanityCheckMountPoint(mntpt, fstype, preexisting):
    """Sanity check that the mountpoint is valid.

    mntpt is the mountpoint being used.
    fstype is the file system being used on the request.
    preexisting is whether the request was preexisting (request.preexist)
    """
    if mntpt:
        passed = 1
        if not mntpt:
            passed = 0
        else:
            if mntpt[0] != '/' or (len(mntpt) > 1 and mntpt[-1:] == '/'):
                passed = 0
	    elif mntpt.find(' ') > -1:
		passed = 0
                
        if not passed:
            return _("The mount point is invalid.  Mount points must start "
                     "with '/' and cannot end with '/', and must contain "
                     "printable characters and no spaces.")
        else:
            return None
    else:
        if (fstype and fstype.isMountable() and not preexisting):
            return _("Please specify a mount point for this partition.")
        else:
            # its an existing partition so don't force a mount point
            return None

def isNotChangable(request, requestlist):
    if request:
	if request.getProtected():
	    return _("You cannot %s this partition, as it is holding the data"
		     "for the hard drive install.")

        if requestlist.isRaidMember(request):
	    return _("You cannot %s this partition as it is part of "
		     "a RAID device")

	if requestlist.isLVMVolumeGroupMember(request):
	    return _("You cannot %s this partition, as it is part of a LVM "
		     "volume group.")

    return None
    

def doDeletePartitionByRequest(intf, requestlist, partition):
    """Delete a partition from the request list.

    intf is the interface
    requestlist is the list of requests
    partition is either the part object or the uniqueID if not a part
    """
    
    if partition == None:
        intf.messageWindow(_("Unable To Delete"),
                           _("You must first select a partition to delete."))
        return 0

    if iutil.getArch() == "s390" and type(partition) != type("RAID"):
	intf.messageWindow(_("Error"),
				_("DASD partitions can only be deleted "
				  "with fdasd"))
	return

    if type(partition) == type("RAID"):
        device = partition
    elif partition.type & parted.PARTITION_FREESPACE:
        intf.messageWindow(_("Unable To Delete"),
                           _("You cannot delete free space."))
        return 0
    else:
        device = partedUtils.get_partition_name(partition)

    ret = requestlist.containsImmutablePart(partition)
    if ret:
        intf.messageWindow(_("Unable To Delete"),
                           _("You cannot delete this "
                             "partition, as it is an extended partition "
                             "which contains %s") %(ret))
        return 0

    # see if device is in our partition requests, remove
    if type(partition) == type("RAID"):
	request = requestlist.getRequestByID(device)
    else:
	request = requestlist.getRequestByDeviceName(device)
	    
    if request:
	state = isNotChangable(request, requestlist)
	if state is not None:
	    intf.messageWindow(_("Unable To Delete"), state % ("delete",))
	    return (None, None)

        if not confirmDeleteRequest(intf, request):
            return 0

        if request.getPreExisting():
            if isinstance(request, partRequests.PartitionSpec):
                # get the drive
                drive = partedUtils.get_partition_drive(partition)

                if partition.type & parted.PARTITION_EXTENDED:
                    requestlist.deleteAllLogicalPartitions(partition)

                delete = partRequests.DeleteSpec(drive, partition.geom.start,
                                                 partition.geom.end)
                requestlist.addDelete(delete)
            elif isinstance(request, partRequests.LogicalVolumeRequestSpec):
                vgreq = requestlist.getRequestByID(request.volumeGroup)
                delete = partRequests.DeleteLogicalVolumeSpec(request.logicalVolumeName,
                                                              vgreq.volumeGroupName)
                requestlist.addDelete(delete)
            elif isinstance(request, partRequests.VolumeGroupRequestSpec):
                delete = partRequests.DeleteVolumeGroupSpec(request.volumeGroupName)
                requestlist.addDelete(delete)
            # FIXME: do we need to do anything with preexisting raids?

        # now remove the request
        requestlist.deleteDependentRequests(request)
        requestlist.removeRequest(request)
    else: # is this a extended partition we made?
        if partition.type & parted.PARTITION_EXTENDED:
            requestlist.deleteAllLogicalPartitions(partition)
        else:
            raise ValueError, "Deleting a non-existent partition"

    del partition
    return 1


def doEditPartitionByRequest(intf, requestlist, part):
    """Edit a partition from the request list.

    intf is the interface
    requestlist is the list of requests
    partition is either the part object or the uniqueID if not a part
    """
    
    if part == None:
        intf.messageWindow(_("Unable To Edit"),
                           _("You must select a partition to edit"))

        return (None, None)

    if type(part) == type("RAID"):

	# see if device is in our partition requests, remove
        request = requestlist.getRequestByID(int(part))
	    
	if request:
	    state = isNotChangable(request, requestlist)
	    if state is not None:
		intf.messageWindow(_("Unable To Edit"), state % ("edit",))
		return (None, None)

	if request.type == REQUEST_RAID:
	    return ("RAID", request)
	elif request.type == REQUEST_VG:
	    return ("LVMVG", request)
	elif request.type == REQUEST_LV:
	    return ("LVMLV", request)
	else:
	    return (None, None)
    elif iutil.getArch() == "s390":
	intf.messageWindow(_("Error"),
				_("You must go back and use fdasd to "
				  "inititalize this partition"))
	return (None, None)
    elif part.type & parted.PARTITION_FREESPACE:
        request = partRequests.PartitionSpec(fsset.fileSystemTypeGetDefault(),
            start = partedUtils.start_sector_to_cyl(part.geom.disk.dev,
                                                    part.geom.start),
            end = partedUtils.end_sector_to_cyl(part.geom.disk.dev,
                                                part.geom.end),
            drive = [ partedUtils.get_partition_drive(part) ])

        return ("NEW", request)
    elif part.type & parted.PARTITION_EXTENDED:
        return (None, None)
    
    ret = requestlist.containsImmutablePart(part)
    if ret:
        intf.messageWindow(_("Unable To Edit"),
                           _("You cannot edit this "
                             "partition, as it is an extended partition "
                             "which contains %s") %(ret))
        return 0

    name = partedUtils.get_partition_name(part)
    request = requestlist.getRequestByDeviceName(name)
    if request:
	state = isNotChangable(request, requestlist)
	if state is not None:
	    intf.messageWindow(_("Unable To Edit"), state % ("edit",))
	    return (None, None)
	
        return ("PARTITION", request)
    else: # shouldn't ever happen
        raise ValueError, ("Trying to edit non-existent partition %s"
                           % (partedUtils.get_partition_name(part)))


def checkForSwapNoMatch(intf, diskset, partitions):
    """Check for any partitions of type 0x82 which don't have a swap fs."""
    for request in partitions.requests:
        if not request.device or not request.fstype:
            continue
        
        part = partedUtils.get_partition_by_name(diskset.disks,
                                                 request.device)
        if (part and (not part.type & parted.PARTITION_FREESPACE)
            and (part.native_type == 0x82)
            and (request.fstype and request.fstype.getName() != "swap")
            and (not request.format)):
            rc = intf.messageWindow(_("Format as Swap?"),
                                    _("/dev/%s has a partition type of 0x82 "
                                      "(Linux swap) but does not appear to "
                                      "be formatted as a Linux swap "
                                      "partition.\n\n"
                                      "Would you like to format this "
                                      "partition as a swap partition?")
                                    % (request.device), type = "yesno")
            if rc == 1:
                request.format = 1
                request.fstype = fsset.fileSystemTypeGet("swap")
                if request.fstype.getName() == "software RAID":
                    part.set_flag(parted.PARTITION_RAID, 1)
                else:
                    part.set_flag(parted.PARTITION_RAID, 0)
                    
                partedUtils.set_partition_file_system_type(part,
                                                           request.fstype)
     
def queryNoFormatPreExisting(intf):
    """Ensure the user wants to use a partition without formatting."""
    txt = _("You have chosen to use a pre-existing "
            "partition for this installation without formatting it. "
            "Red Hat recommends that you format this partition "
            "to make sure files from a previous operating system installation "
            "do not cause problems with this installation of Linux. "
            "However, if this partition contains files that you need "
            "to keep, such as a users home directories, then you should "
            "continue without formatting this partition.")
#            "\n\nAre you sure you want to continue without formatting "
#            "the partition ?")

#    rc = intf.messageWindow(_("Format?"), txt, type = "yesno", default = "no")
    rc = intf.messageWindow(_("Format?"), txt, type = "custom", custom_buttons=[_("Cancel"), _("Do Not Format")])
    return rc

def partitionSanityErrors(intf, errors):
    """Errors were found sanity checking.  Tell the user they must fix."""
    rc = 1
    if errors:
        errorstr = string.join(errors, "\n\n")
        rc = intf.messageWindow(_("Error with Partitioning"),
                                _("The following critical errors exist "
                                  "with your requested partitioning "
                                  "scheme. "
                                  "These errors must be corrected prior "
                                  "to continuing with your install of "
                                  "%s.\n\n%s") %(errorstr, productName))    
    return rc

def partitionSanityWarnings(intf, warnings):
    """Sanity check found warnings.  Make sure the user wants to continue."""
    rc = 1
    if warnings:
        warningstr = string.join(warnings, "\n\n")
        rc = intf.messageWindow(_("Partitioning Warning"),
                                     _("The following warnings exist with "
                                       "your requested partition scheme.\n\n%s"
                                       "\n\nWould you like to continue with "
                                       "your requested partitioning "
                                       "scheme?") % (warningstr),
                                     type="yesno")
    return rc


def partitionPreExistFormatWarnings(intf, warnings):
    """Double check that preexistings being formatted are fine."""
    rc = 1
    if warnings:

        labelstr1 = _("The following pre-existing partitions have been "
                      "selected to be formatted, destroying all data.")

        labelstr2 = _("Select 'Yes' to continue and format these "
                      "partitions, or 'No' to go back and change these "
                      "settings.")
        commentstr = ""
        for (dev, type, mntpt) in warnings:
            commentstr = commentstr + "/dev/%s %s %s\n" % (dev,type,mntpt)
        rc = intf.messageWindow(_("Format Warning"), "%s\n\n%s\n\n%s" %
                                (labelstr1, labelstr2, commentstr),
                                type="yesno")
    return rc

def getPreExistFormatWarnings(partitions, diskset):
    """Return a list of preexisting partitions being formatted."""

    devs = []
    for request in partitions.requests:
        if request.getPreExisting() == 1:
            devs.append(request.uniqueID)

    devs.sort()
    
    rc = []
    for dev in devs:
        request = partitions.getRequestByID(dev)
        if request.format:
            if request.fstype.isMountable():
                mntpt = request.mountpoint
            else:
                mntpt = ""

            if isinstance(request, partRequests.PartitionSpec):
                dev = request.device
            elif isinstance(request, partRequests.RaidRequestSpec):
                dev = "md%s" %(request.raidminor,)
            elif isinstance(request, partRequests.VolumeGroupRequestSpec):
                dev = request.volumeGroupName
            elif isinstance(request, partRequests.LogicalVolumeRequestSpec):
                vgreq = partitions.getRequestByID(request.volumeGroup)
                dev = "%s/%s" %(vgreq.volumeGroupName,
                                request.logicalVolumeName)

            rc.append((dev, request.fstype.getName(), mntpt))

    if len(rc) == 0:
        return None
    else:
        return rc
            
def confirmDeleteRequest(intf, request):
    """Confirm the deletion of a request."""
    if request.device:
	if request.type == REQUEST_VG:
            errmsg = _("You are about to delete the volume group \"%s\"."
		       "\n\nALL logical volumes in this volume group "
		       "will be lost!" % (request.volumeGroupName,))
	elif request.type == REQUEST_LV:
            errmsg = _("You are about to delete the logical volume \"%s\"."
		       % (request.logicalVolumeName,))
	elif request.type == REQUEST_RAID:
            errmsg = _("You are about to delete a RAID device.")
        else:
            errmsg = _("You are about to delete the /dev/%s partition." % (request.device,))
	rc = intf.messageWindow(_("Confirm Delete"), errmsg, type="custom",
				    custom_buttons=[_("Cancel"), _("Delete")])
    else:
	# XXX can this ever happen?
        errmsg = _("Are you sure you want to delete this partition?")
	rc = intf.messageWindow(_("Confirm Delete"), errmsg, type="yesno")

    return rc

def confirmResetPartitionState(intf):
    """Confirm reset of partitioning to that present on the system."""
    rc = intf.messageWindow(_("Confirm Reset"),
                            _("Are you sure you want to reset the "
                              "partition table to its original state?"),
                            type="yesno")
    return rc