"""
Script that saves memory and idmapper data over time.

Data will be saved to game/logs/memoryusage.log. Note that
the script will append to this file if it already exists.

Call this module directly to plot the log (requires matplotlib and numpy).
"""
import os, sys
import time
#TODO!
#sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))))
#os.environ['DJANGO_SETTINGS_MODULE'] = 'game.settings'
import ev
from evennia.utils.idmapper import base as _idmapper

LOGFILE = "logs/memoryusage.log"
INTERVAL = 30 # log every 30 seconds

class Memplot(ev.Script):
    """
    Describes a memory plotting action.

    """
    def at_script_creation(self):
        "Called at script creation"
        self.key = "memplot"
        self.desc = "Save server memory stats to file"
        self.start_delay = False
        self.persistent = True
        self.interval = INTERVAL
        self.db.starttime = time.time()

    def at_repeat(self):
        "Regularly save memory statistics."
        pid = os.getpid()
        rmem = float(os.popen('ps -p %d -o %s | tail -1' % (pid, "rss")).read()) / 1000.0  # resident memory
        vmem = float(os.popen('ps -p %d -o %s | tail -1' % (pid, "vsz")).read()) / 1000.0  # virtual memory
        total_num, cachedict = _idmapper.cache_size()
        t0 = (time.time() - self.db.starttime) / 60.0 # save in minutes

        with open(LOGFILE, "a") as f:
            f.write("%s, %s, %s, %s\n" % (t0, rmem, vmem, int(total_num)))

if __name__ == "__main__":

    # plot output from the file

    from matplotlib import pyplot as pp
    import numpy

    data = numpy.genfromtxt("../../../game/" + LOGFILE, delimiter=",")
    secs = data[:,0]
    rmem = data[:,1]
    vmem = data[:,2]
    nobj = data[:,3]

    # calculate derivative of obj creation
    #oderiv = (0.5*(nobj[2:] - nobj[:-2]) / (secs[2:] - secs[:-2])).copy()
    #oderiv = (0.5*(rmem[2:] - rmem[:-2]) / (secs[2:] - secs[:-2])).copy()

    fig = pp.figure()
    ax1 = fig.add_subplot(111)
    ax1.set_title("1000 bots (normal players with light building)")
    ax1.set_xlabel("Time (mins)")
    ax1.set_ylabel("Memory usage (MB)")
    ax1.plot(secs, rmem, "r", label="RMEM", lw=2)
    ax1.plot(secs, vmem, "b", label="VMEM", lw=2)
    ax1.legend(loc="upper left")

    ax2 = ax1.twinx()
    ax2.plot(secs, nobj, "g--", label="objs in cache", lw=2)
    #ax2.plot(secs[:-2], oderiv/60.0, "g--", label="Objs/second", lw=2)
    #ax2.plot(secs[:-2], oderiv, "g--", label="Objs/second", lw=2)
    ax2.set_ylabel("Number of objects")
    ax2.legend(loc="lower right")
    ax2.annotate("First 500 bots\nconnecting", xy=(10, 4000))
    ax2.annotate("Next 500 bots\nconnecting", xy=(350,10000))
    #ax2.annotate("@reload", xy=(185,600))

#    # plot mem vs cachesize
#    nobj, rmem, vmem = nobj[:262].copy(), rmem[:262].copy(), vmem[:262].copy()
#
#    fig = pp.figure()
#    ax1 = fig.add_subplot(111)
#    ax1.set_title("Memory usage per cache size")
#    ax1.set_xlabel("Cache size (number of objects)")
#    ax1.set_ylabel("Memory usage (MB)")
#    ax1.plot(nobj, rmem, "r", label="RMEM", lw=2)
#    ax1.plot(nobj, vmem, "b", label="VMEM", lw=2)
#

##    # empirical estimate of memory usage: rmem = 35.0 + 0.0157 * Ncache
##    # Ncache = int((rmem - 35.0) / 0.0157)  (rmem in MB)
#
#    rderiv_aver = 0.0157
#    fig = pp.figure()
#    ax1 = fig.add_subplot(111)
#    ax1.set_title("Relation between memory and cache size")
#    ax1.set_xlabel("Memory usage (MB)")
#    ax1.set_ylabel("Idmapper Cache Size (number of objects)")
#    rmem = numpy.linspace(35, 2000, 2000)
#    nobjs = numpy.array([int((mem - 35.0) / 0.0157) for mem in rmem])
#    ax1.plot(rmem, nobjs, "r", lw=2)

    pp.show()
