#  This Source Code Form is subject to the terms of the Mozilla Public
#  License, v. 2.0. If a copy of the MPL was not distributed with this
#  file, You can obtain one at http://mozilla.org/MPL/2.0/.

from __future__ import absolute_import, print_function, unicode_literals

import logging
import voluptuous
from six import text_type

from mozbuild import schedules

logger = logging.getLogger(__name__)


default_optimizations = (
    # always run this task (default)
    None,
    # always optimize this task
    {"always": None},
    # optimize strategy aliases for build kind
    {"build": list(schedules.ALL_COMPONENTS)},
    # search the index for the given index namespaces, and replace this task if found
    # the search occurs in order, with the first match winning
    {"index-search": [text_type]},
    # never optimize this task
    {"never": None},
    # skip the task except for every Nth push
    {"skip-unless-expanded": None},
    {"skip-unless-backstop": None},
    # skip this task if none of the given file patterns match
    {"skip-unless-changed": [text_type]},
    # skip this task if unless the change files' SCHEDULES contains any of these components
    {"skip-unless-schedules": list(schedules.ALL_COMPONENTS)},
    # optimize strategy aliases for the test kind
    {"test": list(schedules.ALL_COMPONENTS)},
    {"test-inclusive": list(schedules.ALL_COMPONENTS)},
    # optimize strategy alias for test-verify tasks
    {"test-verify": list(schedules.ALL_COMPONENTS)},
    # optimize strategy alias for upload-symbols tasks
    {"upload-symbols": None},
)

OptimizationSchema = voluptuous.Any(*default_optimizations)


def set_optimization_schema(schema_tuple):
    """Sets OptimizationSchema so it can be imported by the task transform.
    This function is called by projects that extend Firefox's taskgraph.
    It should be called by the project's taskgraph:register function before
    any transport or job runner code is imported.

    :param tuple schema_tuple: Tuple of possible optimization strategies
    """
    global OptimizationSchema
    if OptimizationSchema.validators == default_optimizations:
        logger.info("OptimizationSchema updated.")
        OptimizationSchema = voluptuous.Any(*schema_tuple)
    else:
        raise Exception("Can only call set_optimization_schema once.")