# Copyright 2020 DeepMind Technologies Limited. All rights reserved.
#
# 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.

"""Launches a Launchpad program using multiple processes."""

from typing import Any, Mapping, Optional, Union

from launchpad import context
from launchpad import program as lp_program
from launchpad.launch import worker_manager
from launchpad.launch import worker_manager_v2
from launchpad.launch.run_locally import run_locally



def launch(program: lp_program.Program,
           local_resources: Optional[Mapping[str, Any]] = None,
           terminal: str = 'gnome-terminal'
           ) -> Union[worker_manager.WorkerManager,
                      worker_manager_v2.WorkerManager]:
  """Launches a program using multiple processes."""
  # Set up the launch context (launch type & launch config) for all nodes
  local_resources = local_resources or {}
  for label, nodes in program.groups.items():
    launch_config = local_resources.get(label, None)
    for node in nodes:
      node._initialize_context(  
          context.LaunchType.LOCAL_MULTI_PROCESSING,
          launch_config=launch_config)

  # Notify the input handles
  for label, nodes in program.groups.items():
    for node in nodes:
      for handle in node.input_handles:
        handle.connect(node, label)

  # Bind addresses
  for node in program.get_all_nodes():
    node.bind_addresses()

  commands = []
  for label, nodes in program.groups.items():
    # to_executables() is a static method, so we can call it from any of the
    # nodes in this group.
    # pytype: disable=wrong-arg-count
    commands.extend(nodes[0].to_executables(nodes, label,
                                            nodes[0].launch_context))
    # pytype: enable=wrong-arg-count
  return run_locally.run_commands_locally(commands, terminal)
