#!/usr/bin/env python

# install.py tool to do a generic build of a library
# soft linked to by many of the lib/Install.py files
# used to automate the steps described in the corresponding lib/README

from __future__ import print_function
import sys,os,subprocess
import glob

sys.path.append('..')
from install_helpers import fullpath, geturl, checkmd5sum, getfallback

# help message

help = """
Syntax from src dir: make lib-libname args="-m machine -e suffix"
Syntax from lib dir: python Install.py -m machine -e suffix

libname = name of lib dir (e.g. atc, h5md, meam, poems, etc)
specify -m and optionally -e, order does not matter

  -m = peform a clean followed by "make -f Makefile.machine"
       machine = suffix of a lib/Makefile.* file
  -e = set EXTRAMAKE variable in Makefile.machine to Makefile.lammps.suffix
       does not alter existing Makefile.machine

Examples:

make lib-mdi args="-m mpi" # build MDI lib with same settings as in the mpi Makefile in src
"""

# settings

version = "1.4.16"
url = "https://github.com/MolSSI-MDI/MDI_Library/archive/v%s.tar.gz" % version

# known checksums for different MDI versions. used to validate the download.
checksums = { \
              '1.4.11' : '3791fe5081405c14aac07d4687f1cc58', \
              '1.4.12' : '7a222353ae8e03961d5365e6cd48baee', \
              '1.4.14' : '7a059bb12535360fdcb7de8402f9a0fc', \
              '1.4.16' : '407db44e2d79447ab5c1233af1965f65', \
              }

# print error message or help

def error(str=None):
  if not str: print(help)
  else: print("ERROR",str)
  sys.exit()

  # expand to full path name
# process leading '~' or relative path

# parse args

args = sys.argv[1:]
nargs = len(args)
if nargs == 0: error()

machine = None
extraflag = 0

iarg = 0
while iarg < nargs:
  if args[iarg] == "-m":
    if iarg+2 > nargs: error()
    machine = args[iarg+1]
    iarg += 2
  elif args[iarg] == "-e":
    if iarg+2 > nargs: error()
    extraflag = 1
    suffix = args[iarg+1]
    iarg += 2
  else: error()

# set lib from working dir

cwd = os.getcwd()
lib = os.path.basename(cwd)

# download and unpack MDI_Library tarball

homepath = fullpath('.')
homedir = "%s/MDI_Library" % homepath

print("Downloading MDI_Library ...")
mditar = "%s/v%s.tar.gz" % (homepath, version)
fallback = getfallback('mdi', url)
try:
  geturl(url, mditar)
except:
  geturl(fallback, mditar)

# verify downloaded archive integrity via md5 checksum, if known.
if version in checksums:
  if not checkmd5sum(checksums[version], mditar):
    print("Checksum did not match. Trying fallback URL", fallback)
    geturl(fallback, mditar)
    if not checkmd5sum(checksums[version], mditar):
      sys.exit("Checksum for MDI library does not match")

print("Unpacking MDI_Library tarball ...")
if os.path.exists("%s/v%s" % (homepath,version)):
  cmd = 'rm -rf "%s/v%s"' % (homepath,version)
  subprocess.check_output(cmd,stderr=subprocess.STDOUT,shell=True)
cmd = 'cd "%s"; tar -xzvf v%s.tar.gz' % (homepath,version)
subprocess.check_output(cmd,stderr=subprocess.STDOUT,shell=True)
os.remove("%s/v%s.tar.gz" % (homepath,version))
if os.path.basename(homedir) != version:
  if os.path.exists(homedir):
    cmd = 'rm -rf "%s"' % homedir
    subprocess.check_output(cmd,stderr=subprocess.STDOUT,shell=True)
  os.rename("%s/MDI_Library-%s" % (homepath,version),homedir)

# create Makefile.auto as copy of Makefile.machine
# reset EXTRAMAKE if requested

if not os.path.exists("Makefile.%s" % machine):
  error("lib/%s/Makefile.%s does not exist" % (lib,machine))

lines = open("Makefile.%s" % machine,'r').readlines()
fp = open("Makefile.auto",'w')

has_extramake = False
for line in lines:
  words = line.split()
  if len(words) == 3 and words[0] == "EXTRAMAKE" and words[1] == '=':
    has_extramake = True
    if extraflag:
      line = line.replace(words[2],"Makefile.lammps.%s" % suffix)
  fp.write(line)

fp.close()

# make the library via Makefile.auto optionally with parallel make

try:
  import multiprocessing
  n_cpus = multiprocessing.cpu_count()
except:
  n_cpus = 1

print("Building lib%s.a ..." % lib)
cmd = "make -f Makefile.auto clean; make -f Makefile.auto -j%d" % n_cpus
txt = subprocess.check_output(cmd,shell=True,stderr=subprocess.STDOUT)
print(txt.decode('UTF-8'))

# create 2 links in lib/mdi to MDI Library src dir

print("Creating links to MDI Library include and lib files")
if os.path.isfile("includelink") or os.path.islink("includelink"):
  os.remove("includelink")
if os.path.isfile("liblink") or os.path.islink("liblink"):
  os.remove("liblink")
os.symlink(os.path.join(homedir, 'MDI_Library'), 'includelink')
os.symlink(os.path.join(homepath, 'build', 'MDI_Library'), 'liblink')

# Append the -rpath option to Makefile.lammps

dir_path = os.path.dirname(os.path.realpath(__file__))
rpath_option = "-Wl,-rpath=" + str(dir_path) + "/liblink"
makefile_lammps = open(str(dir_path) + "/Makefile.lammps", "a")
makefile_lammps.write(str(rpath_option) + "\n")
makefile_lammps.close()

shared_files = glob.glob( os.path.join( homepath, "liblink", "lib%s.a" % lib) )
if len(shared_files) > 0:
  print("Build was successful")
else:
  error("Build of lib/%s/lib%s.a was NOT successful" % (lib,lib))
if has_extramake and not os.path.exists("Makefile.lammps"):
  print("lib/%s/Makefile.lammps was NOT created" % lib)
