# Copyright 2020 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import os
from recipe_engine import recipe_api

INFRA_BUCKET_NAME = 'flutter_infra_release'


class BucketUtilApi(recipe_api.RecipeApi):
  """Utility functions to upload files to cloud buckets.

  Properties:
    upload_packages: (bool) Whether to upload the packages to the bucket.
    force_upload:
      (bool) Whether a file should be re-uploaded if it exists in the bucket.
  """

  def should_upload_packages(self):
    return self.m.properties.get('upload_packages', False)

  def upload_folder(
      self,
      dir_label,
      parent_directory,
      folder_name,
      zip_name,
      platform=None,
      bucket_name=INFRA_BUCKET_NAME
  ):
    """Uploads a folder to the cloud bucket

    Args:
      dir_label: (str) A label to append to the step that creates a temporary directory.
      parent_directory: (str) Parent directory of folder_name.
      folder_name: (str) Folder to upload.
      zip_name: (str) Name of the zip file in the cloud bucket.
      platform: (str) Directory name to add the zip file to.
      bucket_name: (str) The bucket name. Defaults to flutter_infra.
    """
    self.upload_folder_and_files(
        dir_label,
        parent_directory,
        folder_name,
        zip_name,
        platform=platform,
        bucket_name=bucket_name
    )

  def upload_folder_and_files(
      self,
      dir_label,
      parent_directory,
      folder_name,
      zip_name,
      platform=None,
      file_paths=None,
      bucket_name=INFRA_BUCKET_NAME
  ):
    """Uploads a folder and or files to the cloud bucket

    Args:
      dir_label: (str) A label to append to the step that creates a temporary directory.
      parent_directory: (str) Parent directory of folder_name and/or file_paths.
      folder_name: (str) Folder to upload.
      zip_name: (str) Name of the zip file in the cloud bucket.
      platform: (str) directory name to add the zip file to.
      file_paths: (list) A list of string with the filenames to upload.
      bucket_name: (str) The bucket name. Defaults to flutter_infra.
    """
    with self.m.os_utils.make_temp_directory(dir_label) as temp_dir:
      remote_name = '%s/%s' % (platform, zip_name) if platform else zip_name
      local_zip = temp_dir.join(zip_name)
      remote_zip = self.get_cloud_path(remote_name)
      if isinstance(parent_directory, str):
        parent_directory = self.m.path['cache'].join('builder', parent_directory)
      pkg = self.m.zip.make_package(parent_directory, local_zip)
      pkg.add_directory(parent_directory.join(folder_name))

      if file_paths is not None:
        self.add_files(pkg, file_paths)

      pkg.zip('Zip %s' % folder_name)
      if self.should_upload_packages():
        self.safe_upload(local_zip, remote_zip, bucket_name=bucket_name)

  def safe_upload(
      self,
      local_path,
      remote_path,
      bucket_name=INFRA_BUCKET_NAME,
      args=[],
      skip_on_duplicate=False,
      dry_run=False,
      add_mock=True,
  ):
    """Upload a file if it doesn't already exist, fail job otherwise.

    The check can be overridden with the `force_upload` property.

    This method will check whether the file exists first and fail if it does
    not. If should_upload_packages returns false, it still will assert the file
    exists.

    Args:
      local_path: (str) The local path to upload.
      remote_path: (str) The remove path in the cloud bucket.
      bucket_name: (str) The bucket name. Defaults to flutter_infra.
      args: (list) Arguments to pass to gsutil.upload step.
      skip_on_duplicate: (bool)
        Whether to avoid uploading to an already existing path in the bucket.
      dry_run: (bool) Whether to skip the upload even if should_upload_packages
        returns true.
      add_mock: (bool) Whether to call path.add_mock_file for the local_path.

    Returns:
      The result of the gsutil.upload step. Useful for verifying the exit code.
    """
    if add_mock:
      self.m.path.mock_add_file(local_path)

    if not self.m.path.exists(local_path):
      with self.m.step.nest('%s not found' % local_path) as presentation:
        parent_dir = self.m.path.abs_to_path(self.m.path.dirname(local_path))
        self.m.file.listdir('Files in parent directory of safe_upload request', parent_dir)
        presentation.status = self.m.step.FAILURE
        raise AssertionError('File not found %s' % local_path)

    if not self.should_upload_packages() or dry_run:
      return

    experimental = self.m.runtime.is_experimental
    force_upload = self.m.properties.get('force_upload', False)
    # Experimental builds go to a different bucket, duplicates allowed
    if not experimental and not force_upload:
      cloud_path = 'gs://%s/%s' % (bucket_name, remote_path)
      result = self.m.step(
          'Ensure %s does not already exist on cloud storage' % remote_path,
          [
              'python',
              self.m.depot_tools.gsutil_py_path,
              'stat',
              cloud_path,
          ],
          ok_ret='all',
      )
      # A return value of 0 means the file ALREADY exists on cloud storage
      if result.exc_result.retcode == 0:
        if skip_on_duplicate:
          # This file already exists, but we shouldn't fail the build
          return
        raise AssertionError('%s already exists on cloud storage' % cloud_path)

    return self.m.gsutil.upload(
        local_path,
        bucket_name,
        remote_path,
        args=args,
        name='upload "%s"' % remote_path
    )

  def add_files(self, pkg, relative_paths=[]):
    """Adds files to the package.

    Args:
      pkg: (package) The package that contains the files.
      relative_paths:
        (list) The relative_paths parameter is a list of strings and pairs of
        strings. If the path is a string, then it will be used as the source
        filename, and its basename will be used as the destination filename
        in the archive. If the path is a pair, then the first element will be
        used as the source filename, and the second element will be used as the
        destination filename in the archive.
    """
    for path in relative_paths:
      pkg.add_file(pkg.root.join(path), archive_name=self.m.path.basename(path))

  def add_directories(self, pkg, relative_paths=[]):
    """Adds directories to the package.

    Args:
      pkg: (package) The package that contains the files.
      relative_paths:
        (list) The relative_paths parameter is a list of directories to add to
        the archive.
    """
    for path in relative_paths:
      pkg.add_directory(pkg.root.join(path))

  def get_cloud_path(self, path):
    """Gets the path in the cloud bucket.

    Args:
      path: (str) Path to append after the commit hash.

    Returns:
      The path formed by `flutter/<commit-hash|uuid>/<path>`.
    """
    git_hash = self.m.buildbucket.gitiles_commit.id
    # gitiles_commit is only populated on post-submits.
    # UUID is used in LED and try jobs.
    uuid = self.m.uuid.random()
    invocation_id = git_hash if git_hash else uuid

    if self.m.runtime.is_experimental:
      return 'flutter/experimental/%s/%s' % (invocation_id, path)
    return 'flutter/%s/%s' % (invocation_id, path)