#!/usr/bin/env python

import shutil, os, sys

def okay(msg):
	print msg
	a=raw_input("   Press <ENTER> to continue (anything else will terminate): ")

	if a:
		sys.exit(1)

	return


# Simple python script to install mma from tarball
# This should be fixed to be more versatile. Volunteers?

# Before we do anything, make sure we have an up-to-date python.

pyMaj=2
pyMin=4

if sys.version_info[0] < pyMaj or sys.version_info[1] < pyMin:
	print
	print "You need a more current version of Python to run MMA and this install script."
	print "We're looking for something equal or greater than version %s.%s" % \
		  (pyMaj,pyMin)
	print "Current Python version is ", sys.version
	print
	sys.exit(0)


# Banner. Check to make sure user has root permissions.

print """
This script will install mma, the standard library and the
python modules.
"""

try:
	u=os.getuid()
except:
	u=1

if u:
	okay("""You do not appear to be running this script as 'root' user.
Continuing will probably cause all kinds of strange errors
and a generally unsatisfactory experience. But, we can try...
""")

print """
We recommend that you install the package with this script
in the default locations. This script will create a
directory 'mma' in /usr/local/share. If this isn't
what you want, then stop this script and edit this
script's directory locations. But, please note that ONLY
/usr/local/share and /usr/share are supported as default
locations.

The main executable script will be installed in /usr/local/bin.

If you ever decide to get rid of MMA, just delete the executable
in /usr/local/mma and the directory tree in /usr/local/share/mma.

"""

okay("")

###########################################
######## Copy the executable.

bin='/usr/local/bin/mma'

if os.path.exists(bin):
	okay("Existing mma executable '%s' is being overwritten." % bin)
	os.remove(bin)

print "Copying mma to", bin

shutil.copy( 'mma.py', bin)

###########################################
######## Copy the library

dest = '/usr/local/share/mma'

if os.path.exists(dest):
   bu=dest.rsplit('/', 1)[0] + '/mma-old'
   if os.path.exists(bu):
      print "This script was going to move the existing MMA tree to"
      print "a backup directory called '%s'. But that already exists." % bu
      print "So, please delete the backup (and current) directories by hand."
      print "Yes, the script could do this, but it's probably safer for you to do it!"
      sys.exit(1)

   okay("Existing mma tree '%s' is being moved to '%s'." % (dest, bu))
   os.rename( dest, bu )

print "Copying library to", dest
os.makedirs(dest)
shutil.copytree( "lib", dest+"/lib")


###########################################
######## Copy the includes

print "Copying includes to", dest
shutil.copytree( "includes", dest+"/includes")

###########################################
######## Copy the modules

print "Copying python modules to", dest

shutil.copytree( "MMA", dest+"/MMA")

###########################################
######## Copy the html docs

print "Copying HTML documentation to", dest

shutil.copytree( "docs", dest+"/docs")

###########################################
######## Set permissions/udate database

print
print "Updating database file. This uses mma with the -G option."
print "If this fails, something was not installed properly"
print "and you should contact Bob and we'll figure it out."

okay("")

os.system("%s -G" % bin)

print "Setting permissions on MMADIR database file for user update."
os.system("chmod a+w " + dest+"/lib/stdlib/.mmaDB")