#!/usr/bin/python2
# -*- encoding: utf8 -*-
#
# The Qubes OS Project, http://www.qubes-os.org
#
# Copyright (C) 2010  Joanna Rutkowska <joanna@invisiblethingslab.com>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, see <https://www.gnu.org/licenses/>.
#
#

from qubes.qubes import QubesVmCollection
from qubes.qubes import QubesHost
from qubes.qubes import QubesException
from optparse import OptionParser
import sys

def main():
    usage = "usage: %prog [options]"
    parser = OptionParser (usage)

    parser.add_option("--list", dest="list_top",
                      action="store_true", default=False,
                      help="n m : One line summary of top n vms with more than m cpu_time %")

    (options, args) = parser.parse_args ()

    qvm_collection = QubesVmCollection()
    qvm_collection.lock_db_for_reading()
    qvm_collection.load()
    qvm_collection.unlock_db()

    fields_to_display = ["name", "cpu", "mem"]

    cpu_usages = None
    qhost = QubesHost()
    (measure_time, cpu_usages) = qhost.measure_cpu_usage(qvm_collection)

    vms_list = [vm for vm in qvm_collection.values() if vm.is_running()]
    vms_list = sorted(vms_list, key= lambda vm: 1-cpu_usages[vm.get_xid()]['cpu_usage'])

    no_vms = len (vms_list)
    vms_to_display = vms_list

    if options.list_top:
        any_shown = False
        ndisp = 3
        cputh = 0
        if len(args) > 0:
            ndisp = int(args[0])
        if len(args) > 1:
            cputh = int(args[1])

        for vm in vms_to_display[:ndisp]:
            cpu = cpu_usages[vm.get_xid()]['cpu_usage']
            if cpu > cputh:
                any_shown = True
                sys.stdout.write("%d %s, " % (cpu, vm.name))

        if any_shown:
            sys.stdout.write(" ... | ")

        totalMem = 0
        dom0mem = 0
        for vm in vms_to_display:
            if not vm.name == "dom0":
                totalMem += vm.get_mem()
            else:
                dom0mem = vm.get_mem()
        totalMem /= 1024.0 * 1024.0
        dom0mem /= 1024.0 * 1024.0
        sys.stdout.write("%.1f G + %.1f G" % (totalMem, dom0mem))
        return

    max_width = { 'name': 0, 'cpu': 0, 'mem': 0 }
    data_to_display = []
    for vm in vms_to_display:
        data_row = {}
        data_row['name'] = vm.name
        max_width['name'] = max(max_width['name'], len(data_row['name']))
        data_row['cpu'] = "%.1f" % (cpu_usages[vm.get_xid()]['cpu_usage'])
        max_width['cpu'] = max(max_width['cpu'], len(data_row['cpu']))
        data_row['mem'] = "%d" % (vm.get_mem() / (1024.0))
        max_width['mem'] = max(max_width['mem'], len(data_row['mem']))
        data_to_display.append(data_row)

    # Display the header
    s = ""
    for f in fields_to_display:
        fmt="{{0:-^{0}}}-+".format(max_width[f] + 1)
        s += fmt.format('-')
    print s
    s = ""
    for f in fields_to_display:
        fmt="{{0:>{0}}} |".format(max_width[f] + 1)
        s += fmt.format(f)
    print s
    s = ""
    for f in fields_to_display:
        fmt="{{0:-^{0}}}-+".format(max_width[f] + 1)
        s += fmt.format('-')
    print s

    # ... and the actual data
    for row in data_to_display:
        s = ""
        for f in fields_to_display:
            fmt="{{0:>{0}}} |".format(max_width[f] + 1)
            s += fmt.format(row[f])
        print s

main()