# 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/.


import logging
import re
import sys
from functools import partial

from taskgraph.util import json
from taskgraph.util.taskcluster import get_task_definition

from .registry import register_callback_action
from .util import (
    combine_task_graph_files,
    create_tasks,
    fetch_graph_and_labels,
    get_decision_task_id,
    get_pushes,
    get_pushes_from_params_input,
    trigger_action,
)

logger = logging.getLogger(__name__)
SYMBOL_REGEX = re.compile("^(.*)-[a-z0-9]{11}-bk$")
GROUP_SYMBOL_REGEX = re.compile("^(.*)-bk$")

# Allowed browser applications for performance test backfills
# Only Firefox and Geckoview should be backfilled for regression detection
ALLOWED_PERFTEST_BACKFILL_APPS = (
    "firefox",
    "geckoview",
    "fenix",
)


def input_for_support_action(revision, task, times=1, retrigger=True):
    """Generate input for action to be scheduled.

    Define what label to schedule with 'label'.
    If it is a test task that uses explicit manifests add that information.
    """
    input = {
        "label": task["metadata"]["name"],
        "revision": revision,
        "times": times,
        # We want the backfilled tasks to share the same symbol as the originating task
        "symbol": task["extra"]["treeherder"]["symbol"],
        "retrigger": retrigger,
    }

    # Support tasks that are using manifest based scheduling
    if task["payload"].get("env", {}).get("MOZHARNESS_TEST_PATHS"):
        input["test_manifests"] = json.loads(
            task["payload"]["env"]["MOZHARNESS_TEST_PATHS"]
        )

    return input


@register_callback_action(
    title="Backfill",
    name="backfill",
    permission="backfill",
    symbol="Bk",
    description=("Given a task schedule it on previous pushes in the same project."),
    order=200,
    context=[{}],  # This will be available for all tasks
    schema={
        "type": "object",
        "properties": {
            "depth": {
                "type": "integer",
                "default": 19,
                "minimum": 1,
                "maximum": 25,
                "title": "Depth",
                "description": (
                    "The number of previous pushes before the current "
                    "push to attempt to trigger this task on."
                ),
            },
            "inclusive": {
                "type": "boolean",
                "default": False,
                "title": "Inclusive Range",
                "description": (
                    "If true, the backfill will also retrigger the task "
                    "on the selected push."
                ),
            },
            "times": {
                "type": "integer",
                "default": 1,
                "minimum": 1,
                "maximum": 10,
                "title": "Times",
                "description": (
                    "The number of times to execute each job you are backfilling."
                ),
            },
            "retrigger": {
                "type": "boolean",
                "default": True,
                "title": "Retrigger",
                "description": (
                    "If False, the task won't retrigger on pushes that have already "
                    "ran it."
                ),
            },
        },
        "additionalProperties": False,
    },
    available=lambda parameters: True,
)
def backfill_action(parameters, graph_config, input, task_group_id, task_id):
    """
    This action takes a task ID and schedules it on previous pushes (via support action).

    To execute this action locally follow the documentation here:
    https://taskcluster-taskgraph.readthedocs.io/en/latest/howto/create-actions.html#testing-actions
    """
    task = get_task_definition(task_id)

    # Only backfill allowed browser applications for performance tests
    task_label = task.get("metadata", {}).get("name", "")
    is_browsertime = "browsertime" in task_label

    if is_browsertime and not any(
        app in task_label for app in ALLOWED_PERFTEST_BACKFILL_APPS
    ):
        logger.warning(
            f"Skipping backfill for non-allowed raptor-browsertime task: {task_label}"
        )
        return

    pushes = get_pushes_from_params_input(parameters, input)
    failed = False
    input_for_action = input_for_support_action(
        revision=parameters["head_rev"],
        task=task,
        times=input.get("times", 1),
        retrigger=input.get("retrigger", True),
    )

    for push_id in pushes:
        try:
            # The Gecko decision task can sometimes fail on a push and we need to handle
            # the exception that this call will produce
            push_decision_task_id = get_decision_task_id(parameters["project"], push_id)
        except Exception:
            logger.warning(f"Could not find decision task for push {push_id}")
            # The decision task may have failed, this is common enough that we
            # don't want to report an error for it.
            continue

        try:
            trigger_action(
                action_name="backfill-task",
                # This lets the action know on which push we want to add a new task
                decision_task_id=push_decision_task_id,
                input=input_for_action,
            )
        except Exception:
            logger.exception(f"Failed to trigger action for {push_id}")
            failed = True

    if failed:
        sys.exit(1)


def add_backfill_suffix(regex, symbol, suffix):
    m = regex.match(symbol)
    if m is None:
        symbol += suffix
    return symbol


def backfill_modifier(task, input):
    if task.label != input["label"]:
        return task

    logger.debug(f"Modifying test_manifests for {task.label}")
    times = input.get("times", 1)

    # Set task duplicates based on 'times' value.
    if times > 1:
        task.attributes["task_duplicates"] = times

    # If the original task has defined test paths
    test_manifests = input.get("test_manifests")
    if test_manifests:
        revision = input.get("revision")

        task.attributes["test_manifests"] = test_manifests
        task.task["payload"]["env"]["MOZHARNESS_TEST_PATHS"] = json.dumps(
            test_manifests
        )
        # The name/label might have been modify in new_label, thus, change it here as well
        task.task["metadata"]["name"] = task.label
        th_info = task.task["extra"]["treeherder"]
        # Use a job symbol of the originating task as defined in the backfill action
        th_info["symbol"] = add_backfill_suffix(
            SYMBOL_REGEX, th_info["symbol"], f"-{revision[0:11]}-bk"
        )
        if th_info.get("groupSymbol"):
            # Group all backfilled tasks together
            th_info["groupSymbol"] = add_backfill_suffix(
                GROUP_SYMBOL_REGEX, th_info["groupSymbol"], "-bk"
            )
        task.task["tags"]["action"] = "backfill-task"
    return task


def do_not_modify(task):
    return task


def new_label(label, tasks):
    """This is to handle the case when a previous push does not contain a specific task label
    and we try to find a label we can reuse.

    For instance, we try to backfill chunk #3, however, a previous push does not contain such
    chunk, thus, we try to reuse another task/label.
    """
    logger.info(f"Extracting new label for {label}")

    if "-" not in label:
        raise Exception(
            f"Expected '-' was not found in label {label}, cannot extract new label."
        )

    begining_label, ending = label.rsplit("-", 1)

    if ending.isdigit():
        # We assume that the taskgraph has chunk #1 OR unnumbered chunk and we hijack it
        if begining_label in tasks:
            return begining_label
        if begining_label + "-1" in tasks:
            return begining_label + "-1"
        raise Exception(f"New label ({label}) was not found in the task-graph")
    else:
        raise Exception(f"{label} was not found in the task-graph")


@register_callback_action(
    name="backfill-task",
    title="Backfill task on a push.",
    permission="backfill",
    symbol="backfill-task",
    description="This action is normally scheduled by the backfill action. "
    "The intent is to schedule a task on previous pushes.",
    order=500,
    context=[],
    schema={
        "type": "object",
        "properties": {
            "label": {"type": "string", "description": "A task label"},
            "revision": {
                "type": "string",
                "description": "Revision of the original push from where we backfill.",
            },
            "symbol": {
                "type": "string",
                "description": "Symbol to be used by the scheduled task.",
            },
            "test_manifests": {
                "type": "array",
                "default": [],
                "description": "An array of test manifest paths",
                "items": {"type": "string"},
            },
            "times": {
                "type": "integer",
                "default": 1,
                "minimum": 1,
                "maximum": 10,
                "title": "Times",
                "description": (
                    "The number of times to execute each job " "you are backfilling."
                ),
            },
            "retrigger": {
                "type": "boolean",
                "default": True,
                "title": "Retrigger",
                "description": (
                    "If False, the task won't retrigger on pushes that have already "
                    "ran it."
                ),
            },
        },
    },
)
def add_task_with_original_manifests(
    parameters, graph_config, input, task_group_id, task_id
):
    """
    This action is normally scheduled by the backfill action. The intent is to schedule a test
    task with the test manifests from the original task (if available).

    The push in which we want to schedule a new task is defined by the parameters object.

    To execute this action locally follow the documentation here:
    https://taskcluster-taskgraph.readthedocs.io/en/latest/howto/create-actions.html#testing-actions
    """
    # This step takes a lot of time when executed locally
    logger.info("Retreving the full task graph and labels.")
    decision_task_id, full_task_graph, label_to_taskid, _ = fetch_graph_and_labels(
        parameters, graph_config
    )

    label = input.get("label")
    if not input.get("retrigger") and label in label_to_taskid:
        logger.info(
            f"Skipping push with decision task ID {decision_task_id} as it already has this test."
        )
        return

    if label not in full_task_graph.tasks:
        label = new_label(label, full_task_graph.tasks)

    to_run = [label]

    logger.info("Creating tasks...")
    create_tasks(
        graph_config,
        to_run,
        full_task_graph,
        label_to_taskid,
        parameters,
        decision_task_id,
        suffix="0",
        modifier=partial(backfill_modifier, input=input),
    )

    # TODO Implement a way to write out artifacts without assuming there's
    # multiple sets of them so we can stop passing in "suffix".
    combine_task_graph_files(["0"])


@register_callback_action(
    title="Backfill all browsertime",
    name="backfill-all-browsertime",
    permission="backfill",
    symbol="baB",
    description=(
        "Schedule all browsertime tests for the current and previous push in the same project."
    ),
    order=800,
    context=[],  # This will be available for all tasks
    available=lambda parameters: True,
)
def backfill_all_browsertime(parameters, graph_config, input, task_group_id, task_id):
    """
    This action takes a revision and schedules it on previous pushes (via support action).

    To execute this action locally follow the documentation here:
    https://taskcluster-taskgraph.readthedocs.io/en/latest/howto/create-actions.html#testing-actions
    """
    pushes = get_pushes(
        project=parameters["head_repository"],
        end_id=int(parameters["pushlog_id"]),
        depth=2,
    )

    for push_id in pushes:
        try:
            # The Gecko decision task can sometimes fail on a push and we need to handle
            # the exception that this call will produce
            push_decision_task_id = get_decision_task_id(parameters["project"], push_id)
        except Exception:
            logger.warning(f"Could not find decision task for push {push_id}")
            # The decision task may have failed, this is common enough that we
            # don't want to report an error for it.
            continue

        try:
            trigger_action(
                action_name="add-all-browsertime",
                # This lets the action know on which push we want to add a new task
                decision_task_id=push_decision_task_id,
            )
        except Exception:
            logger.exception(f"Failed to trigger action for {push_id}")
            sys.exit(1)


def filter_raptor_jobs(full_task_graph, label_to_taskid, project):
    # Late import to prevent impacting other backfill action tasks
    from ..util.attributes import match_run_on_projects

    to_run = []
    for label, entry in full_task_graph.tasks.items():
        if entry.kind != "test":
            continue
        if entry.task.get("extra", {}).get("suite", "") != "raptor":
            continue
        if not match_run_on_projects(
            project, entry.attributes.get("run_on_projects", [])
        ):
            continue
        if "macosx1500" in entry.attributes.get("test_platform", ""):
            continue
        if "browsertime" not in entry.attributes.get("raptor_try_name", ""):
            continue
        if "shippable" not in entry.attributes.get("test_platform", ""):
            continue
        if "android" in entry.attributes.get("test_platform", ""):
            # Bug 1786254 - The backfill bot is scheduling too many tests atm
            continue
        exceptions = ("live", "profiling", "youtube-playback")
        if any(e in entry.attributes.get("raptor_try_name", "") for e in exceptions):
            continue
        # Only run on allowed browser applications.
        raptor_try_name = entry.attributes.get("raptor_try_name", "")
        if not any(app in raptor_try_name for app in ALLOWED_PERFTEST_BACKFILL_APPS):
            continue
        if "firefox" in raptor_try_name and entry.attributes.get(
            "test_platform", ""
        ).endswith("64-shippable-qr/opt"):
            # add the browsertime test
            if label not in label_to_taskid:
                to_run.append(label)
        if "geckoview" in raptor_try_name:
            # add the pageload test
            if label not in label_to_taskid:
                to_run.append(label)
    return to_run


@register_callback_action(
    name="add-all-browsertime",
    title="Add All Browsertime Tests.",
    permission="backfill",
    symbol="aaB",
    description="This action is normally scheduled by the backfill-all-browsertime action. "
    "The intent is to schedule all browsertime tests on a specific pushe.",
    order=900,
    context=[],
)
def add_all_browsertime(parameters, graph_config, input, task_group_id, task_id):
    """
    This action is normally scheduled by the backfill-all-browsertime action. The intent is to
    trigger all browsertime tasks for the current revision.

    The push in which we want to schedule a new task is defined by the parameters object.

    To execute this action locally follow the documentation here:
    https://taskcluster-taskgraph.readthedocs.io/en/latest/howto/create-actions.html#testing-actions
    """
    logger.info("Retreving the full task graph and labels.")
    decision_task_id, full_task_graph, label_to_taskid, _ = fetch_graph_and_labels(
        parameters, graph_config
    )

    to_run = filter_raptor_jobs(full_task_graph, label_to_taskid, parameters["project"])

    create_tasks(
        graph_config,
        to_run,
        full_task_graph,
        label_to_taskid,
        parameters,
        decision_task_id,
    )
    logger.info(f"Scheduled {len(to_run)} raptor tasks (time 1)")