#     Copyright 2015, Kay Hayen, mailto:kay.hayen@gmail.com
#
#     Part of "Nuitka", an optimizing Python compiler that is compatible and
#     integrates with CPython, but also works on its own.
#
#     Licensed under the Apache License, Version 2.0 (the "License");
#     you may not use this file except in compliance with the License.
#     You may obtain a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
#     Unless required by applicable law or agreed to in writing, software
#     distributed under the License is distributed on an "AS IS" BASIS,
#     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#     See the License for the specific language governing permissions and
#     limitations under the License.
#
""" Main program code generation.

This is for the actual entry point code, which is mostly fed by a template,
but also customized through a lot of runtime configuration values.

Examples of these are sys.executable, and sys.flags, but of course also the
frame object data (filename, etc).
"""

import os
import sys

from nuitka import Options

from .ConstantCodes import getModuleConstantCode
from .templates.CodeTemplatesMain import template_main_program


def generateMainCode(main_module, codes, context):
    python_flags = Options.getPythonFlags()

    if context.mayRaiseException():
        code_identifier = context.getCodeObjectHandle(
            filename      = main_module.getRunTimeFilename(),
            var_names     = (),
            arg_count     = 0,
            kw_only_count = 0,
            line_number   = 0,
            code_name     = "<module>",
            is_generator  = False,
            is_optimized  = False,
            has_starlist  = False,
            has_stardict  = False,
            has_closure   = False,
            future_flags  = main_module.getSourceReference().getFutureSpec().\
                              asFlags()
        )
    else:
        code_identifier = "NULL"

    main_code        = template_main_program % {
        "sys_executable"       : getModuleConstantCode(
            constant = sys.executable,
        ),
        "python_sysflag_debug" : sys.flags.debug,
        "python_sysflag_py3k_warning" : ( sys.flags.py3k_warning
            if hasattr(sys.flags, "py3k_warning") else 0 ),
        "python_sysflag_division_warning" : ( sys.flags.division_warning
            if hasattr(sys.flags, "division_warning") else 0 ),
        #"python_sysflag_division_new" : sys.flags.division_new, #not supported
        "python_sysflag_inspect" : sys.flags.inspect,
        "python_sysflag_interactive" : sys.flags.interactive,
        "python_sysflag_optimize" : sys.flags.optimize,
        "python_sysflag_dont_write_bytecode" : sys.flags.dont_write_bytecode,
        "python_sysflag_no_site" : os.environ.get(
            "NUITKA_SITE_FLAG",
            1 if "no_site" in Options.getPythonFlags() else 0
        ),
        "python_sysflag_no_user_site" : sys.flags.no_user_site,
        "python_sysflag_ignore_environment" : sys.flags.ignore_environment,
        "python_sysflag_tabcheck" : ( sys.flags.tabcheck
            if hasattr(sys.flags, "tabcheck") else 0 ),
        "python_sysflag_verbose" : 1 if "trace_imports" in python_flags else 0,
        "python_sysflag_unicode" : ( sys.flags.unicode
            if hasattr(sys.flags, "unicode") else 0 ),
        "python_sysflag_bytes_warning" : sys.flags.bytes_warning,
        "python_sysflag_hash_randomization" : (
            sys.flags.hash_randomization
              if (hasattr(sys.flags, "hash_randomization") and \
                  "no_randomization" not in python_flags) else
            0
        ),
        "python_no_warnings" : 1 if "no_warnings" in python_flags else 0,
        "code_identifier"  : code_identifier
    }

    return codes + main_code
