# based on http://protips.readthedocs.io/link-roles.html

from __future__ import print_function
from __future__ import unicode_literals
import re
import os
from docutils import nodes
from local_util import run_cmd_get_output


# TODO may need to optimize to get the correct git revision
def get_github_rev():
    path = run_cmd_get_output('git rev-parse --short HEAD')
    tag = run_cmd_get_output('git describe --exact-match')
    print('Git commit ID: ', path)
    if len(tag):
        print('Git tag: ', tag)
        path = tag
    return path


def setup(app):
    #rev = get_github_rev()
    rev = ""

    # links to files or folders on the GitHub
    # baseurl = 'https://github.com/beken/armino'
    # app.add_role('armino', autolink('{}/tree/{}/%s'.format(baseurl, rev)))
    # app.add_role('armino_file', autolink('{}/blob/{}/%s'.format(baseurl, rev)))
    # app.add_role('armino_raw', autolink('{}/raw/{}/%s'.format(baseurl, rev)))
    # app.add_role('component', autolink('{}/tree/{}/components/%s'.format(baseurl, rev)))
    # app.add_role('component_file', autolink('{}/blob/{}/components/%s'.format(baseurl, rev)))
    # app.add_role('component_raw', autolink('{}/raw/{}/components/%s'.format(baseurl, rev)))
    # app.add_role('example', autolink('{}/tree/{}/projects/examples/%s'.format(baseurl, rev)))
    # app.add_role('example_file', autolink('{}/blob/{}/projects/examples/%s'.format(baseurl, rev)))
    # app.add_role('example_raw', autolink('{}/raw/{}/projects/examples/%s'.format(baseurl, rev)))
    # app.add_role('example', autolink('{}/tree/{}/projects/examples/%s'.format(baseurl, rev)))
    # app.add_role('middleware', autolink('{}/tree/{}/middleware/%s'.format(baseurl, rev)))
    # app.add_role('middleware_file', autolink('{}/blob/{}/middleware/%s'.format(baseurl, rev)))
    # app.add_role('middleware_raw', autolink('{}/raw/{}/middleware/%s'.format(baseurl, rev)))

    rev = 'refs/heads/armino_main' 
    baseurl = 'http://192.168.0.46/gerrit/plugins/gitiles/iot/wcn'
    app.add_role('armino', autolink('{}/projects/+/{}/%s'.format(baseurl, rev)))
    app.add_role('armino_file', autolink('{}/projects/+/{}/%s'.format(baseurl, rev)))
    app.add_role('armino_raw', autolink('{}/projects/+/{}/%s'.format(baseurl, rev)))
    app.add_role('component', autolink('{}/projects/+/{}/components/%s'.format(baseurl, rev)))
    app.add_role('component_file', autolink('{}/projects/+/{}/components/%s'.format(baseurl, rev)))
    app.add_role('component_raw', autolink('{}/projects/+/{}/components/%s'.format(baseurl, rev)))
    app.add_role('example', autolink('{}/projects/+/{}/examples/%s'.format(baseurl, rev)))
    app.add_role('example_file', autolink('{}/projects/+/{}/examples/%s'.format(baseurl, rev)))
    app.add_role('example_raw', autolink('{}/projects/+/{}/examples/%s'.format(baseurl, rev)))
    app.add_role('middleware', autolink('{}/projects/+/{}/middleware/%s'.format(baseurl, rev)))
    app.add_role('middleware_file', autolink('{}/projects/+/{}/middleware/%s'.format(baseurl, rev)))
    app.add_role('middleware_raw', autolink('{}/projects/+/{}/middleware/%s'.format(baseurl, rev)))
 
    # link to the current documentation file in specific language version
    on_rtd = os.environ.get('READTHEDOCS', None) == 'True'
    if on_rtd:
        # provide RTD specific commit identification to be included in the link
        tag_rev = 'latest'
        if (run_cmd_get_output('git rev-parse --short HEAD') != rev):
            tag_rev = rev
    else:
        # if not on the RTD then provide generic identification
        tag_rev = run_cmd_get_output('git describe --always')

    DOCS_VERSION = os.getenv('DOCS_VERSION')

    if DOCS_VERSION is None:
        app.add_role('link_to_translation', crosslink('%s../../%s/latest/%s.html'))
    else:
        app.add_role('link_to_translation', crosslink('%s../../%s/{}/%s.html'.format(DOCS_VERSION)))

    return {
        'parallel_read_safe': True,
        'parallel_write_safe': True,
    }
    #if len(tag_rev):
    #    app.add_role('link_to_translation', crosslink('%s../../%s/html/{}/%s.html'.format(tag_rev)))
    #else:
    #app.add_role('link_to_translation', crosslink('%s../../%s/html/%s.html'))


def autolink(pattern):
    def role(name, rawtext, text, lineno, inliner, options={}, content=[]):
        m = re.search('(.*)\s*<(.*)>', text)  # noqa: W605 - regular expression
        if m:
            link_text = m.group(1)
            link = m.group(2)
        else:
            link_text = text
            link = text
        url = pattern % (link,)
        node = nodes.reference(rawtext, link_text, refuri=url, **options)
        return [node], []
    return role


def crosslink(pattern):
    def role(name, rawtext, text, lineno, inliner, options={}, content=[]):
        (language, link_text) = text.split(':')
        docname = inliner.document.settings.env.docname
        doc_path = inliner.document.settings.env.doc2path(docname, None)
        return_path = '../' * doc_path.count('/')
        url = pattern % (return_path, language, docname)
        node = nodes.reference(rawtext, link_text, refuri=url, **options)
        return [node], []
    return role