from docutils.parsers.rst import Directive
from docutils.parsers.rst import states, directives
from docutils.parsers.rst.roles import set_classes
from docutils import nodes

class details(nodes.General, nodes.Element):
    pass

class summary(nodes.General, nodes.Element):
    pass

def visit_details_node(self, node):
    self.body.append(self.starttag(node, 'details', CLASS=node.attributes.get('class', '')))

def visit_summary_node(self, node):
    self.body.append(self.starttag(node, 'summary', CLASS=node.attributes.get('summary-class', '')))
    self.body.append(node.rawsource)

def depart_details_node(self, node):
    self.body.append('</details>\n')

def depart_summary_node(self, node):
    self.body.append('</summary>')

class DetailsDirective(Directive):
    final_argument_whitespace = True
    optional_arguments = 1

    option_spec = {
        'class': directives.class_option,
        'summary-class': directives.class_option,
    }

    has_content = True

    def run(self):
        set_classes(self.options)
        self.assert_has_content()

        text = '\n'.join(self.content)
        node = details(text, **self.options)

        if self.arguments:
            summary_node = summary(self.arguments[0], **self.options)
            summary_node.source, summary_node.line = self.state_machine.get_source_and_line(self.lineno)
            node += summary_node

        self.state.nested_parse(self.content, self.content_offset, node)
        return [node]

def setup(app):
    app.add_node(details, html=(visit_details_node, depart_details_node))
    app.add_node(summary, html=(visit_summary_node, depart_summary_node))
    app.add_directive('details', DetailsDirective)
    return {'parallel_read_safe': True}