# Copyright 2022 The Pigweed Authors
#
# 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
#
#     https://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.
"""Roll a pin of a git repository in a simple text file."""

import re
from typing import Generator

import attrs
from PB.go.chromium.org.luci.buildbucket.proto import common as common_pb2
from PB.recipes.pigweed.txt_roller import InputProperties
from PB.recipe_modules.pigweed.checkout.options import (
    Options as CheckoutOptions,
)
from recipe_engine import post_process, recipe_api, recipe_test_api

DEPS = [
    'fuchsia/auto_roller',
    'pigweed/checkout',
    'pigweed/roll_util',
    'recipe_engine/buildbucket',
    'recipe_engine/file',
    'recipe_engine/path',
    'recipe_engine/properties',
    'recipe_engine/step',
]

PROPERTIES = InputProperties


def RunSteps(  # pylint: disable=invalid-name
    api: recipe_api.RecipeScriptApi,
    props: InputProperties,
):
    txt_path: str = props.txt_path
    project_remote: str = props.project_remote
    project_branch: str = props.project_branch or 'main'

    # The checkout module will try to use trigger data to pull in a specific
    # patch. Since the triggering commit is in a different repository that
    # needs to be disabled.
    props.checkout_options.use_trigger = False
    checkout: api.checkout.CheckoutContext = api.checkout(
        props.checkout_options
    )

    new_revision: Optional[str] = None

    # First, try to get new_revision from the trigger.
    bb_remote: Optional[str] = None
    commit: common_pb2.GitilesCommit = (
        api.buildbucket.build.input.gitiles_commit
    )
    if commit and commit.project:
        new_revision = commit.id
        host: str = commit.host
        bb_remote: str = f'https://{host}/{commit.project}'

    # If we still don't have a revision then it wasn't in the trigger. (Perhaps
    # this was manually triggered.) In this case we update to the
    # property-specified branch HEAD.
    if new_revision is None:
        new_revision = project_branch

    # If this was triggered by a gitiles poller, check that the triggering
    # repository matches project_remote.

    if bb_remote:
        if not checkout.remotes_equivalent(project_remote, bb_remote):
            raise api.step.StepFailure(
                'triggering repository ({}) does not match project remote '
                '({})'.format(bb_remote, project_remote)
            )

    project_dir: config_types.Path = api.path.start_dir / 'project'

    project_checkout: api.checkout.CheckoutContext = api.checkout(
        CheckoutOptions(
            remote=project_remote,
            branch=project_branch,
            use_trigger=True,
        ),
        root=project_dir,
    )

    # In case new_revision is a branch name we need to retrieve the hash it
    # resolves to.
    if not re.search(r'^[0-9a-f]{40}$', new_revision):
        new_revision = api.checkout.get_revision(
            project_dir, 'get new revision', test_data='2' * 40
        )

    full_txt_path: config_types.Path = checkout.root / txt_path

    old_revision: str = api.file.read_text(
        'read old revision',
        full_txt_path,
        test_data='1' * 40,
    ).strip()

    api.file.write_text(
        'write new revision', full_txt_path, f'{new_revision}\n'
    )

    direction: api.roll_util.Direction = api.roll_util.get_roll_direction(
        project_dir, old_revision, new_revision
    )

    # If the primary roll is not necessary or is backwards we can exit
    # immediately.
    if not api.roll_util.can_roll(direction):
        api.roll_util.skip_roll_step(project_remote, old_revision, new_revision)
        return

    with api.step.nest('txt_path') as pres:
        pres.step_summary_text = repr(txt_path)

    rolls: dict[str, api.roll_util.Roll] = {
        txt_path: api.roll_util.create_roll(
            project_name=txt_path,
            old_revision=old_revision,
            new_revision=new_revision,
            proj_dir=project_dir,
            direction=direction,
        ),
    }

    authors: Sequence[api.roll_util.Account] = api.roll_util.authors(
        *rolls.values()
    )

    author_override: Optional[api.roll_util.Account] = None
    if len(authors) == 1 and props.forge_author:
        author_override = attrs.asdict(
            api.roll_util.fake_author(next(iter(authors)))
        )

    change: api.auto_roller.GerritChange = api.auto_roller.attempt_roll(
        props.auto_roller_options,
        repo_dir=checkout.root,
        commit_message=api.roll_util.message(*rolls.values()),
        author_override=author_override,
    )

    return api.auto_roller.raw_result(change)


def GenTests(api) -> Generator[recipe_test_api.TestData, None, None]:
    """Create tests."""

    def _url(x):
        assert ':' not in x
        return 'https://foo.googlesource.com/' + x

    def trigger(url, **kwargs):
        return api.checkout.ci_test_data(git_repo=_url(url), **kwargs)

    def properties(**kwargs):
        props = InputProperties(**kwargs)
        props.checkout_options.CopyFrom(api.checkout.git_options())
        props.forge_author = True
        props.auto_roller_options.CopyFrom(
            api.auto_roller.Options(remote=api.checkout.pigweed_repo)
        )
        return api.properties(props)

    def commit_data(name, **kwargs):
        return api.roll_util.commit_data(
            name,
            api.roll_util.commit('a' * 40, 'foo\nbar\n\nChange-Id: I1111'),
            **kwargs,
        )

    yield (
        api.test('success')
        + properties(txt_path='foo.txt', project_remote=_url("foo"))
        + api.roll_util.properties(commit_divider='--divider--')
        + trigger('foo')
        + api.roll_util.forward_roll()
        + commit_data('foo.txt', prefix='')
        + api.auto_roller.success()
    )

    yield (
        api.test('bad-trigger', status='FAILURE')
        + properties(txt_path='foo.txt', project_remote=_url("foo"))
        + trigger('bar')
    )

    yield (
        api.test('no-trigger')
        + properties(txt_path='foo.txt', project_remote=_url("foo"))
        + api.roll_util.forward_roll()
        + commit_data('foo.txt', prefix='')
        + api.auto_roller.success()
    )

    yield (
        api.test('backwards')
        + properties(txt_path='foo.txt', project_remote=_url("foo"))
        + api.roll_util.backward_roll()
    )