import sys
import os.path
import re
import time
from docutils import io, nodes, statemachine, utils
from docutils.error_reporting import ErrorString
from docutils.parsers.rst import Directive, convert_directive_function
from docutils.parsers.rst import directives, roles, states
from docutils.parsers.rst.roles import set_classes
from docutils.transforms import misc

from nbconvert import ConverterHTML


class Notebook(Directive):
    """
    Use nbconvert to insert a notebook into the environment.
    This is based on the Raw directive in docutils
    """
    required_arguments = 1
    optional_arguments = 0
    final_argument_whitespace = True
    option_spec = {}
    has_content = False

    def run(self):
        # check if raw html is supported
        if not self.state.document.settings.raw_enabled:
            raise self.warning('"%s" directive disabled.' % self.name)

        # set up encoding
        attributes = {'format': 'html'}
        encoding = self.options.get(
            'encoding', self.state.document.settings.input_encoding)
        e_handler = self.state.document.settings.input_encoding_error_handler

        # get path to notebook
        source_dir = os.path.dirname(
            os.path.abspath(self.state.document.current_source))
        nb_path = os.path.normpath(os.path.join(source_dir,
                                                self.arguments[0]))
        nb_path = utils.relative_path(None, nb_path)

        # convert notebook to html
        converter = ConverterHTML(nb_path)
        converter.read()

        # add HTML5 scoped attribute to header style tags
        header = map(lambda s: s.replace('<style', '<style scoped="scoped"'),
                     converter.header_body())

        # concatenate raw html lines
        lines = ['<div class="ipynotebook">']
        lines.extend(header)
        lines.extend(converter.main_body())
        lines.append('</div>')
        text = '\n'.join(lines)

        # add dependency
        self.state.document.settings.record_dependencies.add(nb_path)
        attributes['source'] = nb_path

        # create notebook node
        nb_node = notebook('', text, **attributes)
        (nb_node.source, nb_node.line) = \
            self.state_machine.get_source_and_line(self.lineno)

        return [nb_node]


class notebook(nodes.raw):
    pass


def visit_notebook_node(self, node):
    self.visit_raw(node)


def depart_notebook_node(self, node):
    self.depart_raw(node)


def setup(app):
    app.add_node(notebook,
                 html=(visit_notebook_node, depart_notebook_node))

    app.add_directive('notebook', Notebook)