# Copyright 2024 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.

from __future__ import annotations

import configparser
import dataclasses
import io
import re
from typing import TYPE_CHECKING

from PB.recipe_modules.pigweed.bazel.options import Options as BazelOptions
from recipe_engine import recipe_api

if TYPE_CHECKING:  # pragma: no cover
    from typing import Generator
    from PB.recipe_modules.pigweed.bazel_roll.git_repository import (
        GitRepository,
    )
    from recipe_engine import config_types
    from RECIPE_MODULES.fuchsia.git_roll_util import api as git_roll_util_api
    from RECIPE_MODULES.pigweed.checkout import api as checkout_api


class BazelRollApi(recipe_api.RecipeApi):

    def workspace_path(
        self,
        root: config_types.Path,
        value: str,
    ) -> config_types.Path:
        """Figure out the location of the WORKSPACE or MODULE.bazel file.

        If value is '', look for root / 'WORKSPACE' and root / 'MODULE.bazel'.
        If exactly one exists, return it. If not, error out.

        If root / value is a file, return it.

        If root / value is a directory, set root = root / value and apply the
        above logic. This enables applying this logic to subdirectories.

        Args:
            api: Recipe API object.
            root: Checkout root.
            value: Relative path specified in properties.

        Returns:
            Path to the WORKSPACE or MODULE.bazel file.
        """
        if value:
            value_path = root / value
            self.m.path.mock_add_file(value_path)
            if self.m.path.isfile(value_path):
                return value_path
            elif self.m.path.isdir(value_path):  # pragma: no cover
                root = value_path
            else:
                self.m.step.empty(  # pragma: no cover
                    f'{value_path} does not exist',
                    status='FAILURE',
                )

        workspace = root / 'WORKSPACE'
        module_bazel = root / 'MODULE.bazel'

        self.m.path.mock_add_file(workspace)

        if self.m.path.isfile(module_bazel) and self.m.path.isfile(workspace):
            self.m.step.empty(  # pragma: no cover
                f'{module_bazel} and {workspace} both exist',
                status='FAILURE',
            )

        if self.m.path.isfile(module_bazel):
            return module_bazel  # pragma: no cover

        if self.m.path.isfile(workspace):
            return workspace

        self.m.step.empty(  # pragma: no cover
            'no WORKSPACE or MODULE.bazel file found',
            status='FAILURE',
        )

    def update_git_repository(
        self,
        checkout: checkout_self.m.CheckoutContext,
        git_repository: GitRepository,
    ) -> list[git_roll_util_api.Roll]:
        project_name = git_repository.name
        if not project_name:
            project_name = git_repository.remote.split('/')[-1]
            project_name = project_name.removesuffix('.git')

        with self.m.step.nest(project_name):
            workspace_path = self.workspace_path(
                checkout.root,
                git_repository.workspace_path,
            )
            git_repository.branch = git_repository.branch or 'main'

            new_revision = self.m.git_roll_util.resolve_new_revision(
                git_repository.remote,
                git_repository.branch,
                checkout.remotes_equivalent,
            )

            update_result = self.m.bazel.update_commit_hash(
                checkout=checkout,
                project_remote=git_repository.remote,
                new_revision=new_revision,
                path=workspace_path,
                delay_write=True,
            )
            if not update_result:
                self.m.step.empty(
                    'failed to update commit hash',
                    status='FAILURE',
                )

            try:
                roll = self.m.git_roll_util.get_roll(
                    repo_url=git_repository.remote,
                    repo_short_name=project_name,
                    old_rev=update_result.old_revision,
                    new_rev=new_revision,
                )

            except self.m.git_roll_util.BackwardsRollError:
                return []

            update_result.finalize()

            with self.m.step.nest('update MODULE.bazel.lock'):
                runner = self.m.bazel.new_runner(
                    checkout=checkout,
                    options=BazelOptions(),
                )

                with self.m.context(cwd=checkout.root):
                    self.m.step(
                        'bazelisk mod deps --lockfile_mode=update',
                        [
                            runner.ensure(),
                            'mod',
                            'deps',
                            '--lockfile_mode=update',
                        ],
                    )

            return [roll]