#!/usr/bin/env pmpython
""" Test metric value extraction/reporting using the pcp.pmcc module """
#
# Copyright (C) 2013-2015 Red Hat Inc.
#
# 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.
#

import sys
import unittest
from pcp import pmcc, pmapi

if sys.version >= '3':
    import functools
    reduce = functools.reduce

CPU_METRICS = [ "kernel.all.cpu.sys", "kernel.all.cpu.user",
                "kernel.all.cpu.nice", "kernel.all.cpu.idle", ]
MEM_METRICS = [ "mem.physmem", "mem.freemem", ]
DISK_METRICS = [ "disk.all.read", "disk.all.write", "disk.dev.read", ]

class TestPrinter(pmcc.MetricGroupPrinter):
    """ Report latest values from group manager """

    def unavailable(self, metric):
        """ Determine whether metric has values for rate conversion """
        if metric.netValues == None or len(metric.netValues) == 0:
            return 1
        if metric.netPrevValues == None or len(metric.netPrevValues) == 0:
            return 1
        return 0

    def cpu_print(self, group):
        """ Report on processor metric group """
        ticks = {}
        total = 0.0
        for name in CPU_METRICS:
            metric = group[name]
            if self.unavailable(metric):
                ticks.update({ name : None })
                continue
            # metric.value is the result from pmFetch
            # metric.netValues is (inst, name, value) from computeValues
            values = dict(map(lambda x: (x[1], x[2]), metric.netValues))
            prevs = dict(map(lambda x: (x[1], x[2]), metric.netPrevValues))
            inst_val = reduce(lambda x, y: x + y,
                        map(lambda x: values[x] - prevs[x], values.keys()))
            ticks.update({ name : inst_val })
            total += inst_val
        for name in CPU_METRICS:
            if ticks[name] != None:
                if total != 0:
                    print("   ", name, round(ticks[name] / total * 100, 2), "%")
                else:
                    print("   ", name, "0 %")  # avoid divide by zero
            else:
                print("   ", name, "? %")  # no value, first sample usually

    def mem_print(self, group):
        """ Report on memory metric group """
        for name in MEM_METRICS:
            metric = group[name]
            values = dict(map(lambda x: (x[1], x[2]), metric.netValues))
    
            for inst_name in values.keys():
                inst_val = values[inst_name] 
                unit_str = metric.ctx.pmUnitsStr(metric.desc.contents.units)
                print("   ", name, inst_val, unit_str)

    def disk_print(self, group):
        """ Report on disk metric group """
        for name in DISK_METRICS:
            metric = group[name]
            values = dict(map(lambda x: (x[1], x[2]), metric.netValues))
            for inst_name in values.keys():
                inst_val = values[inst_name] 
                unit_str = metric.ctx.pmUnitsStr(metric.desc.contents.units)
                print("   ", name, inst_name, inst_val, unit_str)

    def report(self, manager):
        """ Overrides the base class report, called after each fetch """
        self.cpu_print(manager["cpu"])
        self.mem_print(manager["mem"])
        self.disk_print(manager["disk"])


class TestOptions(pmapi.pmOptions):
    """ Setup a command line option processing object for the test """

    def __init__(self):
        pmapi.pmOptions.__init__(self, "A:a:D:h:O:S:s:T:t:VZ:z?")
        self.pmSetLongOptionHeader("General options")
        self.pmSetLongOptionAlign()
        self.pmSetLongOptionArchive()
        self.pmSetLongOptionDebug()
        self.pmSetLongOptionHost()
        self.pmSetLongOptionOrigin()
        self.pmSetLongOptionStart()
        self.pmSetLongOptionSamples()
        self.pmSetLongOptionFinish()
        self.pmSetLongOptionInterval()
        self.pmSetLongOptionVersion()
        self.pmSetLongOptionTimeZone()
        self.pmSetLongOptionHostZone()
        self.pmSetLongOptionHelp()

class TestConvenienceClasses(unittest.TestCase):
    """
    Test driver class for pcp.pmcc module verification
    """

    def test_context(self):
        """ Create a metric group manager, add some groups,
            then cycle, fetching and printing, depending on
            command line arguments presented.
        """
        try:
            manager = pmcc.MetricGroupManager.builder(OPTS, ARGS)
        except pmapi.pmUsageErr as usage:
            return usage.message()
        self.assertTrue(manager != None)
        manager.printer = TestPrinter()

        # Each entry is a MetricGroup
        manager["cpu"] = CPU_METRICS
        manager["mem"] = MEM_METRICS
        manager["disk"] = DISK_METRICS

        # Real QA test starts here ;)
        return manager.run()


if __name__ == '__main__':
    import sys
    import copy
    ARGS = copy.deepcopy(sys.argv)
    OPTS = TestOptions()

    sys.argv[1:] = ()
    STS = unittest.main()
    sys.exit(STS)
