import re
import io
import os
from docutils import io, nodes, utils, statemachine
from docutils.utils.error_reporting import SafeString, ErrorString
from docutils.parsers.rst.roles import set_classes
from docutils.parsers.rst import Directive, directives
from sphinx.util.docutils import SphinxDirective


def setup(app):

    app.add_config_value(
        'vyos_phabricator_url',
        'https://phabricator.vyos.net/', ''
    )
    app.add_role('vytask', vytask_role)
    app.add_role('cfgcmd', cmd_role)
    app.add_role('opcmd', cmd_role)

    print(app.config.vyos_phabricator_url)

    app.add_node(
        inlinecmd,
        html=(inlinecmd.visit_span, inlinecmd.depart_span),
        latex=(inlinecmd.visit_tex, inlinecmd.depart_tex),
        text=(inlinecmd.visit_span, inlinecmd.depart_span)
    )

    app.add_node(
        CmdDiv,
        html=(CmdDiv.visit_div, CmdDiv.depart_div),
        latex=(CmdDiv.visit_tex, CmdDiv.depart_tex),
        text=(CmdDiv.visit_div, CmdDiv.depart_div)
    )
    app.add_node(
        CmdBody,
        html=(CmdBody.visit_div, CmdBody.depart_div),
        latex=(CmdBody.visit_tex, CmdBody.depart_tex),
        text=(CmdBody.visit_div, CmdBody.depart_div)
    )
    app.add_node(
        CmdHeader,
        html=(CmdHeader.visit_div, CmdHeader.depart_div),
        latex=(CmdHeader.tex, CmdHeader.tex),
        text=(CmdHeader.visit_div, CmdHeader.depart_div)
    )
    app.add_node(CfgcmdList)
    app.add_directive('cfgcmdlist', CfgcmdlistDirective)

    app.add_node(OpcmdList)
    app.add_directive('opcmdlist', OpcmdlistDirective)

    app.add_directive('cfgcmd', CfgCmdDirective)
    app.add_directive('opcmd', OpCmdDirective)
    app.add_directive('cmdinclude', CfgInclude)
    app.connect('doctree-resolved', process_cmd_nodes)


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


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

import json

class CmdHeader(nodes.General, nodes.Element):

    @staticmethod
    def visit_div(self, node):
        self.body.append(self.starttag(node, 'div'))

    @staticmethod
    def depart_div(self, node=None):
        # self.body.append('</div>\n')
        self.body.append('<a class="cmdlink" href="#%s" ' %
                        node.children[0]['refid'] +
                        'title="%s"></a></div>' % (
                        'Permalink to this Command'))

    @staticmethod
    def tex(self, node=None):
        pass


class CmdDiv(nodes.General, nodes.Element):

    @staticmethod
    def visit_div(self, node):
        self.body.append(self.starttag(node, 'div'))

    @staticmethod
    def depart_div(self, node=None):
        self.body.append('</div>\n')

    @staticmethod
    def tex(self, node=None):
        pass

    @staticmethod
    def visit_tex(self, node=None):
        self.body.append('\n\n\\begin{changemargin}{0cm}{0cm}\n')

    @staticmethod
    def depart_tex(self, node=None):
        self.body.append('\n\\end{changemargin}\n\n')

class CmdBody(nodes.General, nodes.Element):

    @staticmethod
    def visit_div(self, node):
        self.body.append(self.starttag(node, 'div'))

    @staticmethod
    def depart_div(self, node=None):
        self.body.append('</div>\n')

    @staticmethod
    def visit_tex(self, node=None):
        self.body.append('\n\n\\begin{changemargin}{0.5cm}{0.5cm}\n')


    @staticmethod
    def depart_tex(self, node=None):
        self.body.append('\n\\end{changemargin}\n\n')


    @staticmethod
    def tex(self, node=None):
        pass


class inlinecmd(nodes.inline):

    @staticmethod
    def visit_span(self, node):
        self.body.append(self.starttag(node, 'span'))

    @staticmethod
    def depart_span(self, node=None):
        self.body.append('</span>\n')

    @staticmethod
    def visit_tex(self, node=None):
        self.body.append(r'\sphinxbfcode{\sphinxupquote{')
        #self.literal_whitespace += 1

    @staticmethod
    def depart_tex(self, node=None):
        self.body.append(r'}}')
        #self.literal_whitespace -= 1


class CfgInclude(Directive):
    required_arguments = 1
    optional_arguments = 0
    final_argument_whitespace = True
    option_spec = {
        'var0': str,
        'var1': str,
        'var2': str,
        'var3': str,
        'var4': str,
        'var5': str,
        'var6': str,
        'var7': str,
        'var8': str,
        'var9': str
    }

    def run(self):
        ### Copy from include directive docutils 
        """Include a file as part of the content of this reST file."""
        if not self.state.document.settings.file_insertion_enabled:
            raise self.warning('"%s" directive disabled.' % self.name)
        source = self.state_machine.input_lines.source(
            self.lineno - self.state_machine.input_offset - 1)
        source_dir = os.path.dirname(os.path.abspath(source))
        path = directives.path(self.arguments[0])
        if path.startswith('<') and path.endswith('>'):
            path = os.path.join(self.standard_include_path, path[1:-1])
        path = os.path.normpath(os.path.join(source_dir, path))
        path = utils.relative_path(None, path)
        path = nodes.reprunicode(path)
        encoding = self.options.get(
            'encoding', self.state.document.settings.input_encoding)
        e_handler=self.state.document.settings.input_encoding_error_handler
        tab_width = self.options.get(
            'tab-width', self.state.document.settings.tab_width)
        try:
            self.state.document.settings.record_dependencies.add(path)
            include_file = io.FileInput(source_path=path,
                                        encoding=encoding,
                                        error_handler=e_handler)
        except UnicodeEncodeError:
            raise self.severe(u'Problems with "%s" directive path:\n'
                              'Cannot encode input file path "%s" '
                              '(wrong locale?).' %
                              (self.name, SafeString(path)))
        except IOError:
            raise self.severe(u'Problems with "%s" directive path.' %
                      (self.name))
        startline = self.options.get('start-line', None)
        endline = self.options.get('end-line', None)
        try:
            if startline or (endline is not None):
                lines = include_file.readlines()
                rawtext = ''.join(lines[startline:endline])
            else:
                rawtext = include_file.read()
        except UnicodeError:
            raise self.severe(u'Problem with "%s" directive:\n%s' %
                              (self.name, ErrorString(error)))
        # start-after/end-before: no restrictions on newlines in match-text,
        # and no restrictions on matching inside lines vs. line boundaries
        after_text = self.options.get('start-after', None)
        if after_text:
            # skip content in rawtext before *and incl.* a matching text
            after_index = rawtext.find(after_text)
            if after_index < 0:
                raise self.severe('Problem with "start-after" option of "%s" '
                                  'directive:\nText not found.' % self.name)
            rawtext = rawtext[after_index + len(after_text):]
        before_text = self.options.get('end-before', None)
        if before_text:
            # skip content in rawtext after *and incl.* a matching text
            before_index = rawtext.find(before_text)
            if before_index < 0:
                raise self.severe('Problem with "end-before" option of "%s" '
                                  'directive:\nText not found.' % self.name)
            rawtext = rawtext[:before_index]

        include_lines = statemachine.string2lines(rawtext, tab_width,
                                                  convert_whitespace=True)
        if 'literal' in self.options:
            # Convert tabs to spaces, if `tab_width` is positive.
            if tab_width >= 0:
                text = rawtext.expandtabs(tab_width)
            else:
                text = rawtext
            literal_block = nodes.literal_block(rawtext, source=path,
                                    classes=self.options.get('class', []))
            literal_block.line = 1
            self.add_name(literal_block)
            if 'number-lines' in self.options:
                try:
                    startline = int(self.options['number-lines'] or 1)
                except ValueError:
                    raise self.error(':number-lines: with non-integer '
                                     'start value')
                endline = startline + len(include_lines)
                if text.endswith('\n'):
                    text = text[:-1]
                tokens = NumberLines([([], text)], startline, endline)
                for classes, value in tokens:
                    if classes:
                        literal_block += nodes.inline(value, value,
                                                      classes=classes)
                    else:
                        literal_block += nodes.Text(value, value)
            else:
                literal_block += nodes.Text(text, text)
            return [literal_block]
        if 'code' in self.options:
            self.options['source'] = path
            codeblock = CodeBlock(self.name,
                                  [self.options.pop('code')], # arguments
                                  self.options,
                                  include_lines, # content
                                  self.lineno,
                                  self.content_offset,
                                  self.block_text,
                                  self.state,
                                  self.state_machine)
            return codeblock.run()

        new_include_lines = []

        for line in include_lines:
            for i in range(10):
                value = self.options.get(f'var{i}','')
                if value == '':
                    line = re.sub('\s?{{\s?var' + str(i) + '\s?}}',value,line)
                else:
                    line = re.sub('{{\s?var' + str(i) + '\s?}}',value,line)

            new_include_lines.append(line)
        self.state_machine.insert_input(new_include_lines, path)
        return []


class CfgcmdlistDirective(Directive):

    def run(self):
        return [CfgcmdList('')]


class OpcmdlistDirective(Directive):

    def run(self):
        return [OpcmdList('')]


class CmdDirective(SphinxDirective):

    has_content = True
    custom_class = ''

    def run(self):
        title_list = []
        content_list = []
        title_text = ''
        content_text = ''
        has_body = False

        cfgmode = self.custom_class + "cmd"

        if '' in self.content:
            index = self.content.index('')
            title_list = self.content[0:index]
            content_list = self.content[index + 1:]
            title_text = ' '.join(title_list)
            content_text = '\n'.join(content_list)
            has_body = True
        else:
            title_text = ' '.join(self.content)

        anchor_id = nodes.make_id(self.custom_class + "cmd-" + title_text)
        target = nodes.target(ids=[anchor_id])

        panel_name = 'cmd-{}'.format(self.custom_class)
        panel_element = CmdDiv()
        panel_element['classes'] += ['cmd', panel_name]

        heading_element = CmdHeader(title_text)
        title_nodes, messages = self.state.inline_text(title_text,
                                                       self.lineno)

        title = inlinecmd(title_text, '', *title_nodes)
        target['classes'] += []
        title['classes'] += [cfgmode]
        heading_element.append(target)
        heading_element.append(title)

        heading_element['classes'] += [self.custom_class + 'cmd-heading']

        panel_element.append(heading_element)

        append_list = {
            'docname': self.env.docname,
            'cmdnode': title.deepcopy(),
            'cmd': title_text,
            'target': target,
        }

        if cfgmode == 'opcmd':
            if not hasattr(self.env, "vyos_opcmd"):
                self.env.vyos_opcmd = []
            self.env.vyos_opcmd.append(append_list)

        if cfgmode == 'cfgcmd':
            if not hasattr(self.env, "vyos_cfgcmd"):
                self.env.vyos_cfgcmd = []
            self.env.vyos_cfgcmd.append(append_list)

        if has_body:
            body_element = CmdBody(content_text)
            self.state.nested_parse(
                content_list,
                self.content_offset,
                body_element
            )

            body_element['classes'] += [self.custom_class + 'cmd-body']
            panel_element.append(body_element)
        return [panel_element]


class OpCmdDirective(CmdDirective):
    custom_class = 'op'


class CfgCmdDirective(CmdDirective):
    custom_class = 'cfg'


def process_cmd_node(app, cmd, fromdocname):
    para = nodes.paragraph()
    newnode = nodes.reference('', '')
    innernode = cmd['cmdnode']
    newnode['refdocname'] = cmd['docname']
    newnode['refuri'] = app.builder.get_relative_uri(
        fromdocname, cmd['docname'])
    newnode['refuri'] += '#' + cmd['target']['refid']
    newnode['classes'] += ['cmdlink']
    newnode.append(innernode)
    para += newnode
    return para


def process_cmd_nodes(app, doctree, fromdocname):
    env = app.builder.env

    for node in doctree.traverse(CfgcmdList):
        content = []

        for cmd in sorted(env.vyos_cfgcmd, key=lambda i: i['cmd']):
            content.append(process_cmd_node(app, cmd, fromdocname))
        node.replace_self(content)

    for node in doctree.traverse(OpcmdList):
        content = []

        for cmd in sorted(env.vyos_opcmd, key=lambda i: i['cmd']):
            content.append(process_cmd_node(app, cmd, fromdocname))
        node.replace_self(content)


def vytask_role(name, rawtext, text, lineno, inliner, options={}, content=[]):
    app = inliner.document.settings.env.app
    base = app.config.vyos_phabricator_url
    ref = base + str(text)
    set_classes(options)
    node = nodes.reference(
        rawtext, utils.unescape(str(text)), refuri=ref, **options)
    return [node], []


def cmd_role(name, rawtext, text, lineno, inliner, options={}, content=[]):
    node = nodes.literal(text, text)
    return [node], []