#!/usr/bin/env python

# Copyright (C) 2005-2024 Splunk Inc. All Rights Reserved.
import sys
import time
import logging
from splunk.clilib.bundle_paths import make_splunkhome_path

sys.path.append(make_splunkhome_path(['etc', 'apps', 'SA-ITOA', 'lib']))
sys.path.append(make_splunkhome_path(['etc', 'apps', 'SA-ITOA', 'lib', 'SA_ITOA_app_common']))
from ITOA.setup_logging import setup_logging
from itsi.objects.itsi_kpi_entity_threshold import ItsiKpiEntityThreshold
from itsi.objects.itsi_kpi_at_info import ItsiKpiAtInfo
from SA_ITOA_app_common.solnlib.conf_manager import ConfManager
from SA_ITOA_app_common.splunklib.binding import HTTPError
from SA_ITOA_app_common.splunklib.results import ResultsReader
from SA_ITOA_app_common.splunklib.searchcommands import dispatch, StreamingCommand, Configuration, Option, validators
from at_utils.utils import divide_into_batches, generate_at_search, generate_entity_at_search, AT_SCALE_DOWN_FACTORS

logger = setup_logging("itsi_batch_at_command.log", "itsi.batchat.command", level=logging.INFO)


@Configuration()
class BatchAtCommand(StreamingCommand):
    """
    BatchAtCommand is a StreamingCommand custom search command that will batch adaptive thresholding searches into
    smaller subsearches.

    itsibatchat will process a list of KPI IDs indentified by 'itsi_kpi_id', group them by batch_size specified
    in itsi_settings.conf and scaled down to the option set for training window. Results of the subsearches will be
    passed through as the results of this command.
    """
    training_window = Option(
        doc="Training window to use for the adaptive thresholding search. Options are -7d, -14d, -30d, or -60d",
        require=False,
        default='-7d'
    )
    entitylevelthreshold = Option(
        doc="Run batchat with entity level AT",
        require=False,
        default=False
    )
    getcollectiondata = Option(
        doc="Get data from collection rather if data not available as records",
        require=False,
        default=False
    )
    log_level = Option(
        doc="Log Level for itsibatchat command",
        require=False,
        default="INFO"
    )
    kpi_level_batch_size = 1000
    entity_level_batch_size = 500
    max_wait_time = 3600
    kpi_id_key = 'kpi_id'
    batches = []

    def get_batch_settings(self):
        """
        Fetches batch size and timeout from itsi_settings.conf
        """
        try:
            cfm = ConfManager(self.service.token, 'SA-ITOA')
            conf = cfm.get_conf('itsi_settings')
            apply_at_settings = conf.get('applyat')
            batch_size_key = 'kpi_level_batch_size'
            default_batch_size = self.kpi_level_batch_size
            if self.entitylevelthreshold:
                batch_size_key = 'entity_level_batch_size'
                default_batch_size = self.entity_level_batch_size
            self.batch_size = int(
                int(apply_at_settings.get(batch_size_key, default_batch_size)) / AT_SCALE_DOWN_FACTORS[self.training_window]
            )
            self.max_wait_time = int(apply_at_settings.get('batch_timeout', 3600))
        # pylint:disable=broad-exception-caught
        except Exception as e:
            logger.exception(e)
            logger.error(
                'Failed to fetch batch settings for adaptive thresholding, '
                'using default value of 1000 for batch_size and 3600 for batch_timeout.')

    def run_search(self, search):
        """
        Runs the search command

        @type: str
        @param search: the search to run
        """
        try:
            search_job = self.service.jobs.create(
                search, earliest_time=self.training_window, latest_time='now'
            )
        except HTTPError as e:
            raise Exception(
                f'Error when running adaptive thresholding search "{search}". Error: {e}'
            )
        return search_job

    def wait_for_job(self, searchjob, maxtime=-1):
        """
        Wait up to maxtime seconds for searchjob to finish.  If maxtime is
        negative (default), waits forever.  Returns true, if job finished.

        @type: splunklib.client.Job
        @param searchjob: the search job to wait on

        @type: int
        @param maxtime: the amount to time to wait
        """
        pause = 0.2
        lapsed = 0.0
        while not searchjob.is_done():
            time.sleep(pause)
            lapsed += pause
            if maxtime >= 0 and lapsed > maxtime:
                break
        return searchjob.is_done()

    def setup(self):
        """
        Setup required for batching adaptive thresholding searches
        """
        if self.training_window not in ['-7d', '-14d', '-30d', '-60d']:
            raise Exception("Invalid option for training window.")
        self.get_batch_settings()
        logger.debug(
            f'Setup for batching adaptive thresholding searches: {{training window:'
            f'{self.training_window}, batch_size: {self.batch_size}, batch_timeout: {self.max_wait_time}}}.'
        )

    def fetch_records(self):
        """
        Fetch KPI or Entity records from collection for objects having AT enabled and matches training window
        """
        if self.entitylevelthreshold:
            return ItsiKpiEntityThreshold(self.service.token, self.service.username).get_bulk("nobody", filter_data={
                "adaptive_thresholds_is_enabled": True,
                "adaptive_thresholding_training_window": self.training_window
            }, fields=["kpi_id", "entity_key", "entity_title"])
        self.kpi_id_key = '_key'
        return ItsiKpiAtInfo(self.service.token, self.service.username).get_bulk("nobody", filter_data={
            "adaptive_thresholding_training_window": self.training_window
        }, fields=["_key"])

    def pre_processing(self, records):
        """
        Processes the ids into the batched searches needed to run adaptive
        thresholding

        @type: generator
        @param records: the data passed in to custom search command
        """
        self.batches = list(divide_into_batches(records, self.batch_size))

    def stream(self, records):
        """
        Configures batch size, groups KPI IDs by batch size, then runs applyat sub-searches for each batch.
        Results of the sub-searches will be passed through to outer search.

        Note: Splunk will send in the KPI IDs in batches of 50,000
        Refer to docs for more details https://docs.splunk.com/DocumentationStatic/PythonSDK/1.6.5/searchcommands.html

        @type: generator
        @param records: the results passed in to the search command
        """
        logger.info(f"Setting up itsibatchat command log level to {self.log_level}")
        logger.setLevel(self.log_level)
        logger.info(f'Begin batching adaptive thresholding applyat searches for {"entities" if self.entitylevelthreshold else "kpis"} of training window {self.training_window}')
        self.setup()
        objects = list(records)
        # Fetch data from collection if command has been used without inputlookup command to stream data
        if not objects and self.getcollectiondata:
            objects = self.fetch_records()
        self.pre_processing(objects)
        batch_num = 1
        for batch in self.batches:
            if self.entitylevelthreshold:
                search = generate_entity_at_search(batch, self.log_level)
            else:
                kpi_ids = [i[self.kpi_id_key] for i in batch]
                search = generate_at_search(kpi_ids, self.log_level)
            search_job = None
            if not search:
                raise Exception("Cannot get AT search from objects list")
            try:
                logger.info(
                    f'Begin adaptive thresholding applyat search for batch {batch_num} out of {len(self.batches)}.'
                )
                start_time = time.time()
                search_job = self.run_search(search)
                is_done = self.wait_for_job(search_job, self.max_wait_time)
                end_time = time.time()
                if is_done:
                    logger.info(
                        f'Completed adaptive thresholding applyat search for batch {batch_num} out of '
                        f'{len(self.batches)} which took {end_time - start_time} seconds.'
                    )
                else:
                    logger.error(
                        f'Timed out adaptive Thresholding with search id {search_job.name} '
                        f'for {batch_num} out of {len(self.batches)}.'
                    )
            except Exception as e:
                logger.exception(e)
                if search_job:
                    logger.error(
                        f'Batched adaptive thresholding search with search id {search_job.name} failed to run '
                        f'for {batch_num} out of {len(self.batches)}.'
                    )
                else:
                    logger.error(
                        'Failed to create batched adaptive thresholding search '
                        f'for {batch_num} out of {len(self.batches)}.'
                    )
            if search_job:
                rr = ResultsReader(search_job.results())
                # pass through the results of the sub searches
                for result in rr:
                    if isinstance(result, dict):
                        yield result
            batch_num += 1
        logger.info(f'Completed batching adaptive thresholding applyat searches for {batch_num - 1} batches of {"entities" if self.entitylevelthreshold else "kpis"}')


dispatch(BatchAtCommand, sys.argv, sys.stdin, sys.stdout, __name__)