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#    Licensed under the Apache License, Version 2.0 (the "License"); you may
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#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
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from docutils import frontend
from docutils import nodes
from docutils.parsers import rst
from docutils import utils
import os
import re
import sys
from unittest import mock

import rally_openstack
from tests.unit import test


ROOT_DIR = os.path.dirname(os.path.dirname(rally_openstack.__file__))


class DockerReadmeTestCase(test.TestCase):
    RE_RELEASE = re.compile(r"\[(?P<version>[0-9]+\.[0-9]+.[0-9]+)\]")

    def get_releases(self):
        full_path = os.path.join(ROOT_DIR, "CHANGELOG.rst")
        with open(full_path) as f:
            changelog = f.read()
        with mock.patch.object(sys, "stderr"):
            parser = rst.Parser()
            settings = frontend.OptionParser(
                components=(rst.Parser,)).get_default_values()
            document = utils.new_document(changelog, settings)
            parser.parse(changelog, document)
            changelog = document.children
        if len(changelog) != 1:
            self.fail("'%s' file should contain one global section "
                      "with subsections for each release." % full_path)

        releases = []
        for node in changelog[0].children:
            if not isinstance(node, nodes.section):
                continue
            title = node.astext().split("\n", 1)[0]
            result = self.RE_RELEASE.match(title)
            if result:
                releases.append(result.groupdict()["version"])
        if not releases:
            self.fail("'%s' doesn't mention any releases..." % full_path)
        return releases

    def test_mentioned_latest_version(self):
        full_path = os.path.join(ROOT_DIR, "DOCKER_README.md")
        with open(full_path) as f:
            readme = f.read()

        releases = self.get_releases()
        latest_release = releases[0]
        previous_release = releases[1]
        print("All discovered releases: %s" % ", ".join(releases))

        found = False
        for i, line in enumerate(readme.split("\n"), 1):
            if latest_release in line:
                found = True
            elif previous_release in line:
                self.fail(
                    "You need to change %s to %s in all places where the "
                    "latest release is mentioned."
                    "\n  Filename: %s"
                    "\n  Line Number: %s"
                    "\n  Line:  %s" %
                    (previous_release, latest_release, full_path, i, line))

        if not found:
            self.fail("No latest nor previous release is found at README file "
                      "for our Docker image. It looks like the format of it "
                      "had changed. Please adopt the current test suite.")