import inspect
import textwrap
import pydoc
import sys

if sys.version_info[0] == 2:
    from docscrape import NumpyDocString
    from docscrape import FunctionDoc
    from docscrape import ClassDoc
else:
    from .docscrape import NumpyDocString
    from .docscrape import FunctionDoc
    from .docscrape import ClassDoc


class SphinxDocString(NumpyDocString):
    # string conversion routines
    def _str_header(self, name, symbol='`'):
        return ['.. rubric:: ' + name, '']

    def _str_field_list(self, name):
        return [':' + name + ':']

    def _str_indent(self, doc, indent=4):
        out = []
        for line in doc:
            out += [' ' * indent + line]
        return out

    def _str_signature(self):
        return ['']
        if self['Signature']:
            return ['``%s``' % self['Signature']] + ['']
        else:
            return ['']

    def _str_summary(self):
        return self['Summary'] + ['']

    def _str_extended_summary(self):
        return self['Extended Summary'] + ['']

    def _str_param_list(self, name):
        out = []
        if self[name]:
            out += self._str_field_list(name)
            out += ['']
            for param, param_type, desc in self[name]:
                out += self._str_indent(['**%s** : %s' % (param.strip(),
                                                          param_type)])
                out += ['']
                out += self._str_indent(desc, 8)
                out += ['']
        return out

    def _str_section(self, name):
        out = []
        if self[name]:
            out += self._str_header(name)
            out += ['']
            content = textwrap.dedent("\n".join(self[name])).split("\n")
            out += content
            out += ['']
        return out

    def _str_see_also(self, func_role):
        out = []
        if self['See Also']:
            see_also = super(SphinxDocString, self)._str_see_also(func_role)
            out = ['.. seealso::', '']
            out += self._str_indent(see_also[2:])
        return out

    def _str_warnings(self):
        out = []
        if self['Warnings']:
            out = ['.. warning::', '']
            out += self._str_indent(self['Warnings'])
        return out

    def _str_index(self):
        idx = self['index']
        out = []
        if len(idx) == 0:
            return out

        out += ['.. index:: %s' % idx.get('default', '')]
        for section, references in idx.iteritems():
            if section == 'default':
                continue
            elif section == 'refguide':
                out += ['   single: %s' % (', '.join(references))]
            else:
                out += ['   %s: %s' % (section, ','.join(references))]
        return out

    def _str_references(self):
        out = []
        if self['References']:
            out += self._str_header('References')
            if isinstance(self['References'], str):
                self['References'] = [self['References']]
            out.extend(self['References'])
            out += ['']
        return out

    def __str__(self, indent=0, func_role="obj"):
        out = []
        out += self._str_signature()
        out += self._str_index() + ['']
        out += self._str_summary()
        out += self._str_extended_summary()
        for param_list in ('Parameters', 'Attributes', 'Methods',
                           'Returns', 'Raises'):
            out += self._str_param_list(param_list)
        out += self._str_warnings()
        out += self._str_see_also(func_role)
        out += self._str_section('Notes')
        out += self._str_references()
        out += self._str_section('Examples')
        out = self._str_indent(out, indent)
        return '\n'.join(out)


class SphinxFunctionDoc(SphinxDocString, FunctionDoc):
    pass


class SphinxClassDoc(SphinxDocString, ClassDoc):
    pass


def get_doc_object(obj, what=None):
    if what is None:
        if inspect.isclass(obj):
            what = 'class'
        elif inspect.ismodule(obj):
            what = 'module'
        elif callable(obj):
            what = 'function'
        else:
            what = 'object'
    if what == 'class':
        return SphinxClassDoc(obj, '', func_doc=SphinxFunctionDoc)
    elif what in ('function', 'method'):
        return SphinxFunctionDoc(obj, '')
    else:
        return SphinxDocString(pydoc.getdoc(obj))
