import argparse

 import os

 import subprocess

 import re

 def decamel(name):

     retval = re.sub('([A-Z])', r'_\1', name).lower()

     return re.sub('^_', r'', retval) 

 parser = argparse.ArgumentParser()

 parser.add_argument("suite_name", help="(convention is <NameInUpperCamelCase>, e.g. StringpairList - suite created will then be StringpairListTests)")

 parser.add_argument("--clobber", "-c", help="Overwrite extant files (must be explicitly indicated)", action='store_true')

 gengroup = parser.add_mutually_exclusive_group()

 gengroup.add_argument("--no_src", help="Generate header only, no source", action='store_true')

 gengroup.add_argument("--no_hdr", help="Generate source only, no header", action='store_true')

 typegroup = parser.add_mutually_exclusive_group()

 typegroup.add_argument("--test", "-t", help="Just generate a generic test suite (no engine initialisation or db/gpg setup/teardown - default)", action='store_true')

 typegroup.add_argument("--indiv", "-i", help="Generate a test suite with engine initialisation/release and gpg/db teardown between each test function", action='store_true')

 typegroup.add_argument("--session", "-s", help="Generate a test suite with engine initialisation/release and gpg/db teardown only at the beginning and end of the test suite", action='store_true')

 args = parser.parse_args()

 suitename = args.suite_name

 test_suite = suitename + "Tests"

 superclass = "EngineTestSuite"

 if args.indiv: 

     superclass = "EngineTestIndividualSuite"

 elif args.session:

     superclass = "EngineTestSessionSuite"

 print("\nCreating " + test_suite + " as an " + superclass + "\n")

 uncamel = decamel(suitename)

 print(uncamel)

 nspace = "using namespace std;\n\n"

 license = ("// This file is under GNU General Public License 3.0\n"

            "// see LICENSE.txt\n\n")

 default_single_testname = "check_" + re.sub('_tests$', r'', uncamel) 

 if not args.no_hdr:

     header_def = uncamel.upper() + "_H"

     deftxt = "#ifndef " + header_def + "\n#define " + header_def + "\n\n"

     header_inc = ("#include <string>\n" 

                   "#include \"" + superclass + ".h\"\n\n")

     header = license + deftxt + header_inc + nspace

     classdef = "class " + test_suite + " : public " + superclass + " {\n" + \

                "    public:\n" + \

                "        " + test_suite + "(string test_suite, string test_home_dir);\n" + \

                "    private:\n" \

                "        void " + default_single_testname + "();\n" + \

                "};\n" 

     header_file = header + classdef + "\n#endif\n"

     #print(header_file)

     do_write = True

     hfile_name = test_suite + ".h"

     hfile_path = os.path.join(os.path.join(os.getcwd(), "include"), hfile_name)

     if not args.clobber:

         if (os.path.isfile(hfile_path)):

             print(hfile_path + " exists. Not writing header file. Use --clobber to overwrite.")

             do_write = False

     if do_write:

         header_out = open(hfile_path, 'w')

         header_out.write(header_file)

         header_out.close()

 if not args.no_src:

     src_inc = ('#include <stdlib.h>\n'

                '#include <string>\n\n'

                '#include "pEpEngine.h"\n\n'

                '#include "' + superclass +'.h"\n'

                '#include "' + test_suite + '.h"\n\n')

     test_suite_prefix = test_suite + "::"

     fname = test_suite_prefix + default_single_testname

     constructor = test_suite_prefix + test_suite + "(string suitename, string test_home_dir) :\n" + \

                   "    " + superclass + "::" + superclass + "(suitename, test_home_dir) {\n" + \

                   "    add_test_to_suite(std::pair<std::string, void (Test::Suite::*)()>(string(\"" + fname + "\"),\n" + \

                   "                                                                      static_cast<Func>(&" + fname + ")));\n" + \

                   "}\n\n"

     def_funct = "void " + test_suite_prefix + default_single_testname + "() {\n" + \

                 "    TEST_ASSERT(true);\n" + \

                 "}\n\n"

     src_file = license + src_inc + nspace + constructor + def_funct

     do_write = True

     sfile_name = test_suite + ".cc"

     sfile_path = os.path.join(os.path.join(os.getcwd(), "src/engine_tests"), sfile_name)

     if not args.clobber:

         if (os.path.isfile(sfile_path)):

             print(sfile_path + " exists. Not writing source file. Use --clobber to overwrite.")

             do_write = False

     if do_write:

         src_out = open(sfile_path, 'w')

         src_out.write(src_file)

         src_out.close()