#!/usr/bin/env python

import distutils.sysconfig as dist
import shutil
import os
import sys
import getopt

def usage():
    print """Usage:
    ./install [-p <prefix for asap binary>]
              [-m <where to install python module>]
              [-h] this message
    """

def get_libs(lib='_asap.so'):
    lddcommand = "/usr/bin/ldd"
    lddopts = ""
    if (sys.platform == "darwin"):
        lddcommand = "/usr/bin/otool"
        lddopts = "-L"
    if not os.path.isfile(lddcommand):
        raise IOError("ldd/otool is not available")
    if not os.path.exists(lib):
        raise IOError("File %s not found" %lib)
    p = os.popen(lddcommand+" "+lddopts+" "+lib)
    resolved = []
    unresolved = []
    if sys.platform == "linux2":
        for l in p.readlines():
            lsp = l.split()
            # test this to avoid fails on linux_gate, which has no library
            if len(lsp) >= 3:
                if lsp[2] == "not":
                    unresolved.append(lsp[0])
                else:
                    resolved.append(lsp[2])
    elif sys.platform == "darwin":
        for l in p.readlines():
            l = l.strip()
            if l.endswith(":"):
                continue
            l = l.split()[0]
            if not os.path.exists(l):
                unresolved.append(l)
            else:
                resolved.append(l)
    return resolved, unresolved


try:
    opts, args = getopt.getopt(sys.argv[1:], "p:m:h",
                               ["exec-prefix=", "module-dir=", "help"])

except getopt.GetoptError:
    usage()
    sys.exit(2)

execprefix = dist.EXEC_PREFIX
moduledir = dist.get_python_lib()
sysmoduledir = moduledir
for k, v in opts:
    if k in ("-h", "--help"):
        usage()
        sys.exit()
    if k in ("-p", "--exec-prefix"):
        v = os.path.expanduser(v)
        v = os.path.expandvars(v)
        if not os.path.exists(v):
            print "The specified exec directory %s doesn't exist" % v
            sys.exit(1)
        p = os.path.join(v,"bin")
        if not os.path.exists(p):
            print "The specified exec directory %s doesn't exist" % p
            sys.exit(1)
        execprefix = v
    if k in ("-m", "--module-dir"):
        v = os.path.expanduser(v)
        v = os.path.expandvars(v)
        if not os.path.exists(v):
            print "The specified module directory %s doesn't exist" % v
            sys.exit(1)
        moduledir = v

print "Looking fo all required libraries..."
try:
    libs, missing = get_libs(lib="asap/_asap.so")
    if len(missing):
        print " The following libraries are missing:"
        print missing
        sys.exit(1)
    else:
        print "   All required libraries are present."
except IOError,msg:
    print "Skipping test. (%s)" % msg

print 'Looking for dependent python modules...'
try:
    import matplotlib
except ImportError:
    print "Matplotlib not found"
    sys.exit(1)
if int(matplotlib.__version__.split(".")[1]) < 87:
    print "Warning: matplotlib version < 0.87." \
          "This might cause errors. Please upgrade."
try:
    import matplotlib.backends.backend_tkagg
except ImportError:
    print "Matplotlib doesn't have Tk support"
    sys.exit(1)
try:
    import numpy
except ImportError:
    try:
        import numarray
    except ImportError:
        print "You need to have either 'numpy' or 'numarray' installed."
        sys.exit(1)
try:
    import IPython
except ImportError:
    print "IPython should be installed."
    sys.exit(1)

print "   All required modules were found."
moddir = os.path.join(moduledir, "asap")
bindir =  os.path.join(execprefix, "bin")
try:
    if os.path.exists(moddir):
        print "Found previous installation of ASAP. Removing..."
        shutil.rmtree(moddir)
    print "Installing asap module in %s" % moddir
    shutil.copytree("asap", moddir)
    print "Installing asap  scripts in %s" % bindir
    if moduledir != sysmoduledir:
        import re
        print "Changing asap startup script to use custom PYTHONPATH"
        inf = file("bin/asap")
        outf = file(os.path.join(bindir,"asap"), "w")
        outline = "export PYTHONPATH=%s" % moduledir
        regx = sre.compile("\*\*PYTHONPATH\*\*")
        for line in inf.readlines():
            if regx.search(line):
                line = outline
            outf.write(line)
        outf.close()
        os.chmod(os.path.join(bindir,"asap"), 0755)
    else:
        shutil.copy2("bin/asap", bindir)
    shutil.copy2("bin/asap_update_data", bindir)
    if not os.path.exists("asap/data/ephemerides"):
        print "Warning - no data directory present"
        print "Please run asap_update_data after the installation is completed."
    print "Installation completed."
except OSError, oe:
    print oe