#!/usr/bin/python3

#

# https://bugzilla.redhat.com/show_bug.cgi?id=665817

#

# Usage:

#

#   virt-top --csv data.csv

#   processcsv.py < data.csv

#

# Note this OVERWRITES the following files in the current directory:

#

#   global.csv         # all the global data

#   domain<NN>.csv     # data for domain ID <NN> (multiple files)

import sys

import csv

rows = csv.reader (sys.stdin)

# Get the header row.

header = next(rows)

# Find the index of the 'Hostname' and 'Time' cols (usually first two).

hostname_i = header.index ("Hostname")

time_i = header.index ("Time")

# Find the index of the 'Domain ID' column (i) and the number of

# columns per domain (w).

i = header.index ("Domain ID")

w = len (header) - i

dom_header = header[i:i+w]

dom_header.insert (0, "Hostname")

dom_header.insert (1, "Time")

gfile = open ("global.csv", "w")

gfile_writer = csv.writer (gfile)

gfile_writer.writerow (header[0:i])

dfiles = dict()

# Process all the remaining data rows.

for data in rows:

    # Global data is columns 0..i-1

    gfile_writer.writerow (data[0:i])

    hostname = data[hostname_i]

    time = data[time_i]

    # For each domain ...

    for j in range(i,len(data),w):

        dom = data[j:j+w]

        domid = dom[0]

        if domid in dfiles:

            dfile_writer = dfiles[domid]

        else:

            dfile = open ("domain%s.csv" % domid, "w")

            dfile_writer = csv.writer (dfile)

            dfile_writer.writerow (dom_header)

            dfiles[domid] = dfile_writer

        dom.insert (0, hostname)

        dom.insert (1, time)

        dfile_writer.writerow (dom)