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# Authors: Andreas Sandberg

from __future__ import print_function
from __future__ import absolute_import

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):
        self.name = name
        self.cxx_name = cxx_name if cxx_name else name
        self.args = args
        self.return_value_policy = return_value_policy

    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('.def(' + ', '.join(arguments) + ')')