# Copyright (c) 2017, 2019 ARM Limited
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#
# 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
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# modified or unmodified, in source code or in binary form.
#
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# 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
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# 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
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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) + ')')
