# Copyright 2015 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file 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.
from botocore.docs.shape import ShapeDocumenter
from botocore.docs.utils import py_default


class BaseExampleDocumenter(ShapeDocumenter):
    def document_example(self, section, shape, prefix=None, include=None,
                         exclude=None):
        """Generates an example based on a shape

        :param section: The section to write the documentation to.

        :param shape: The shape of the operation.

        :param prefix: Anything to be included before the example

        :type include: Dictionary where keys are parameter names and
            values are the shapes of the parameter names.
        :param include: The parameter shapes to include in the documentation.

        :type exclude: List of the names of the parameters to exclude.
        :param exclude: The names of the parameters to exclude from
            documentation.
        """
        history = []
        section.style.new_line()
        section.style.start_codeblock()
        if prefix is not None:
            section.write(prefix)
        self.traverse_and_document_shape(
            section=section, shape=shape, history=history,
            include=include, exclude=exclude)

    def document_recursive_shape(self, section, shape, **kwargs):
        section.write('{\'... recursive ...\'}')

    def document_shape_default(self, section, shape, history, include=None,
                               exclude=None, **kwargs):
        py_type = self._get_special_py_default(shape)
        if py_type is None:
            py_type = py_default(shape.type_name)

        if self._context.get('streaming_shape') == shape:
            py_type = 'StreamingBody()'
        section.write(py_type)

    def document_shape_type_string(self, section, shape, history,
                                   include=None, exclude=None, **kwargs):
        if 'enum' in shape.metadata:
            for i, enum in enumerate(shape.metadata['enum']):
                section.write('\'%s\'' % enum)
                if i < len(shape.metadata['enum']) - 1:
                    section.write('|')
        else:
            self.document_shape_default(section, shape, history)

    def document_shape_type_list(self, section, shape, history, include=None,
                                 exclude=None, **kwargs):
        param_shape = shape.member
        list_section = section.add_new_section('list-value')
        self._start_nested_param(list_section, '[')
        param_section = list_section.add_new_section(
            'member', context={'shape': param_shape.name})
        self.traverse_and_document_shape(
            section=param_section, shape=param_shape, history=history)
        ending_comma_section = list_section.add_new_section('ending-comma')
        ending_comma_section.write(',')
        ending_bracket_section = list_section.add_new_section(
            'ending-bracket')
        self._end_nested_param(ending_bracket_section, ']')

    def document_shape_type_structure(self, section, shape, history,
                                      include=None, exclude=None, **kwargs):
        if not shape.members:
            section.write('{}')
            return

        section = section.add_new_section('structure-value')
        self._start_nested_param(section, '{')

        input_members = self._add_members_to_shape(shape.members, include)

        for i, param in enumerate(input_members):
            if exclude and param in exclude:
                continue
            param_section = section.add_new_section(param)
            param_section.write('\'%s\': ' % param)
            param_shape = input_members[param]
            param_value_section = param_section.add_new_section(
                'member-value', context={'shape': param_shape.name})
            self.traverse_and_document_shape(
                section=param_value_section, shape=param_shape,
                history=history, name=param)
            if i < len(input_members) - 1:
                ending_comma_section = param_section.add_new_section(
                    'ending-comma')
                ending_comma_section.write(',')
                ending_comma_section.style.new_line()
        self._end_structure(section, '{', '}')

    def document_shape_type_map(self, section, shape, history,
                                include=None, exclude=None, **kwargs):
        map_section = section.add_new_section('map-value')
        self._start_nested_param(map_section, '{')
        value_shape = shape.value
        key_section = map_section.add_new_section(
            'key', context={'shape': shape.key.name})
        key_section.write('\'string\': ')
        value_section = map_section.add_new_section(
            'value', context={'shape': value_shape.name})
        self.traverse_and_document_shape(
            section=value_section, shape=value_shape, history=history)
        end_bracket_section = map_section.add_new_section('ending-bracket')
        self._end_nested_param(end_bracket_section, '}')

    def _add_members_to_shape(self, members, include):
        if include:
            members = members.copy()
            for param in include:
                members[param.name] = param
        return members

    def _start_nested_param(self, section, start=None):
        if start is not None:
            section.write(start)
        section.style.indent()
        section.style.indent()
        section.style.new_line()

    def _end_nested_param(self, section, end=None):
        section.style.dedent()
        section.style.dedent()
        section.style.new_line()
        if end is not None:
            section.write(end)

    def _end_structure(self, section, start, end):
        # If there are no members in the strucuture, then make sure the
        # start and the end bracket are on the same line, by removing all
        # previous text and writing the start and end.
        if not section.available_sections:
            section.clear_text()
            section.write(start + end)
            self._end_nested_param(section)
        else:
            end_bracket_section = section.add_new_section('ending-bracket')
            self._end_nested_param(end_bracket_section, end)


class ResponseExampleDocumenter(BaseExampleDocumenter):
    EVENT_NAME = 'response-example'

    def document_shape_type_event_stream(self, section, shape, history,
                                         **kwargs):
        section.write('EventStream(')
        self.document_shape_type_structure(section, shape, history, **kwargs)
        end_section = section.add_new_section('event-stream-end')
        end_section.write(')')


class RequestExampleDocumenter(BaseExampleDocumenter):
    EVENT_NAME = 'request-example'

    def document_shape_type_structure(self, section, shape, history,
                                      include=None, exclude=None, **kwargs):
        param_format = '\'%s\''
        operator = ': '
        start = '{'
        end = '}'

        if len(history) <= 1:
            operator = '='
            start = '('
            end = ')'
            param_format = '%s'
        section = section.add_new_section('structure-value')
        self._start_nested_param(section, start)
        input_members = self._add_members_to_shape(shape.members, include)

        for i, param in enumerate(input_members):
            if exclude and param in exclude:
                continue
            param_section = section.add_new_section(param)
            param_section.write(param_format % param)
            param_section.write(operator)
            param_shape = input_members[param]
            param_value_section = param_section.add_new_section(
                'member-value', context={'shape': param_shape.name})
            self.traverse_and_document_shape(
                section=param_value_section, shape=param_shape,
                history=history, name=param)
            if i < len(input_members) - 1:
                ending_comma_section = param_section.add_new_section(
                    'ending-comma')
                ending_comma_section.write(',')
                ending_comma_section.style.new_line()
        self._end_structure(section, start, end)
