#!/usr/bin/env python3
"""Activate an evergreen task in the existing build."""
import os
import sys
from typing import List, Optional

import click
import structlog
from pydantic.main import BaseModel

from evergreen.api import EvergreenApi, RetryingEvergreenApi

# Get relative imports to work when the package is not installed on the PYTHONPATH.
if __name__ == "__main__" and __package__ is None:
    sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

# pylint: disable=wrong-import-position
from buildscripts.util.cmdutils import enable_logging
from buildscripts.util.fileops import read_yaml_file
from buildscripts.util.taskname import remove_gen_suffix

# pylint: enable=wrong-import-position

LOGGER = structlog.getLogger(__name__)

EVG_CONFIG_FILE = "./.evergreen.yml"
BURN_IN_TAGS = "burn_in_tags"
BURN_IN_TESTS = "burn_in_tests"
BURN_IN_VARIANT_SUFFIX = "generated-by-burn-in-tags"


class EvgExpansions(BaseModel):
    """
    Evergreen expansions file contents.

    build_id: ID of build being run.
    version_id: ID of version being run.
    task_name: Name of task creating the generated configuration.
    """

    build_id: str
    version_id: str
    task_name: str

    @classmethod
    def from_yaml_file(cls, path: str) -> "EvgExpansions":
        """Read the generation configuration from the given file."""
        return cls(**read_yaml_file(path))

    @property
    def task(self) -> str:
        """Get the task being generated."""
        return remove_gen_suffix(self.task_name)


def activate_task(expansions: EvgExpansions, evg_api: EvergreenApi) -> None:
    """
    Activate the given task in the specified build.

    :param expansions: Evergreen expansions file contents.
    :param evg_api: Evergreen API client.
    """
    tasks_not_activated = []
    if expansions.task == BURN_IN_TAGS:
        version = evg_api.version_by_id(expansions.version_id)
        burn_in_build_variants = [
            variant for variant in version.build_variants_map.keys()
            if variant.endswith(BURN_IN_VARIANT_SUFFIX)
        ]
        for build_variant in burn_in_build_variants:
            build_id = version.build_variants_map[build_variant]
            task_list = evg_api.tasks_by_build(build_id)

            for task in task_list:
                if task.display_name == BURN_IN_TESTS:
                    LOGGER.info("Activating task", task_id=task.task_id,
                                task_name=task.display_name)
                    try:
                        evg_api.configure_task(task.task_id, activated=True)
                    except Exception:
                        LOGGER.warning("Could not activate task", task_id=task.task_id,
                                       task_name=task.display_name)
                        tasks_not_activated.append(task.task_id)

    else:
        task_list = evg_api.tasks_by_build(expansions.build_id)
        for task in task_list:
            if task.display_name == expansions.task:
                LOGGER.info("Activating task", task_id=task.task_id, task_name=task.display_name)
                try:
                    evg_api.configure_task(task.task_id, activated=True)
                except Exception:
                    LOGGER.warning("Could not activate task", task_id=task.task_id,
                                   task_name=task.display_name)
                    tasks_not_activated.append(task.task_id)
    if len(tasks_not_activated) > 0:
        LOGGER.error("Some tasks were unable to be activated",
                     unactivated_tasks=len(tasks_not_activated))
        raise ValueError(
            "Some tasks were unable to be activated, failing the task to let the author know. "
            "This should not be a blocking issue but may mean that some tasks are missing from your patch."
        )


@click.command()
@click.option("--expansion-file", type=str, required=True,
              help="Location of expansions file generated by evergreen.")
@click.option("--evergreen-config", type=str, default=EVG_CONFIG_FILE,
              help="Location of evergreen configuration file.")
@click.option("--verbose", is_flag=True, default=False, help="Enable verbose logging.")
def main(expansion_file: str, evergreen_config: str, verbose: bool) -> None:
    """
    Activate the associated generated executions based in the running build.

    The `--expansion-file` should contain all the configuration needed to generate the tasks.
    \f
    :param expansion_file: Configuration file.
    :param evergreen_config: Evergreen configuration file.
    :param verbose: Use verbose logging.
    """
    enable_logging(verbose)
    expansions = EvgExpansions.from_yaml_file(expansion_file)
    evg_api = RetryingEvergreenApi.get_api(config_file=evergreen_config)

    activate_task(expansions, evg_api)


if __name__ == "__main__":
    main()  # pylint: disable=no-value-for-parameter