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#
# Copyright (C) 2015 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the 'License');
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an 'AS IS' BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import json
import requests


class GerritError(RuntimeError):
    def __init__(self, code, url):
        self.code = code
        self.url = url
        super(GerritError, self).__init__('Error {}: {}'.format(code, url))


def get_commit(change_id, revision):
    return json.loads(
        call('/changes/{}/revisions/{}/commit'.format(change_id, revision)))


def call(endpoint, method='GET'):
    if method != 'GET':
        raise NotImplementedError('Currently only HTTP GET is supported.')
    gerrit_url = 'https://android-review.googlesource.com'
    url = gerrit_url + endpoint
    response = requests.get(url)
    if response.status_code != 200:
        raise GerritError(response.status_code, url)
    return response.text[5:]


def ref_for_change(change_id):
    endpoint = '/changes/{}/detail?o=CURRENT_REVISION'.format(change_id)
    change = json.loads(call(endpoint))
    commit = change['current_revision']
    return change['revisions'][commit]['fetch']['http']['ref']


def get_labels(change_id, patch_set):
    """Returns labels attached to a revision.

    Returned data is in the following format:
    {
        'Code-Review': {
            <email>: <value>,
            ...
        },
        'Verified': {
            <email>: <value>,
            ...
        }
    }
    """
    details = call('/changes/{}/revisions/{}/review'.format(
        change_id, patch_set))
    labels = {'Code-Review': {}, 'Verified': {}}
    for review in details['labels']['Code-Review']['all']:
        if 'value' in review and 'email' in review:
            labels['Code-Review'][review['email']] = int(review['value'])
    for review in details['labels']['Verified']['all']:
        if 'value' in review and 'email' in review:
            labels['Verified'][review['email']] = int(review['value'])
    return labels