# Copyright (c) 2017, 2019 ARM Limited
# All rights reserved.
#
# The license below extends only to copyright in the software and shall
# not be construed as granting a license to any other intellectual
# property including but not limited to intellectual property relating
# to a hardware implementation of the functionality of the software
# licensed hereunder.  You may use the software subject to the license
# terms below provided that you ensure that this notice is replicated
# unmodified and in its entirety in all distributions of the software,
# modified or unmodified, in source code or in binary form.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
# redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution;
# neither the name of the copyright holders nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

from abc import *


class PyBindExport(object, metaclass=ABCMeta):
    @abstractmethod
    def export(self, code, cname):
        pass


class PyBindProperty(PyBindExport):
    def __init__(self, name, cxx_name=None, writable=True):
        self.name = name
        self.cxx_name = cxx_name if cxx_name else name
        self.writable = writable

    def export(self, code, cname):
        export = "def_readwrite" if self.writable else "def_readonly"
        code('.${export}("${{self.name}}", &${cname}::${{self.cxx_name}})')


class PyBindMethod(PyBindExport):
    def __init__(
        self,
        name,
        cxx_name=None,
        args=None,
        return_value_policy=None,
        static=False,
    ):
        self.name = name
        self.cxx_name = cxx_name if cxx_name else name
        self.args = args
        self.return_value_policy = return_value_policy
        self.method_def = "def_static" if static else "def"

    def _conv_arg(self, value):
        if isinstance(value, bool):
            return "true" if value else "false"
        elif isinstance(value, (float, int)):
            return repr(value)
        else:
            raise TypeError("Unsupported PyBind default value type")

    def export(self, code, cname):
        arguments = ['"${{self.name}}"', "&${cname}::${{self.cxx_name}}"]
        if self.return_value_policy:
            arguments.append(
                "pybind11::return_value_policy::"
                "${{self.return_value_policy}}"
            )
        if self.args:

            def get_arg_decl(arg):
                if isinstance(arg, tuple):
                    name, default = arg
                    return 'py::arg("%s") = %s' % (
                        name,
                        self._conv_arg(default),
                    )
                else:
                    return 'py::arg("%s")' % arg

            arguments.extend(list([get_arg_decl(a) for a in self.args]))
        code("." + self.method_def + "(" + ", ".join(arguments) + ")")