import copy
import time

import frostfs_testlib.resources.optionals as optionals
from frostfs_testlib.load.k6 import K6
from frostfs_testlib.load.load_config import (
    EndpointSelectionStrategy,
    K6ProcessAllocationStrategy,
    LoadParams,
    LoadScenario,
    LoadType,
)
from frostfs_testlib.load.load_report import LoadReport
from frostfs_testlib.load.load_steps import init_s3_client, prepare_k6_instances
from frostfs_testlib.load.load_verifiers import LoadVerifier
from frostfs_testlib.reporter import get_reporter
from frostfs_testlib.resources.load_params import (
    K6_TEARDOWN_PERIOD,
    LOAD_NODE_SSH_PASSWORD,
    LOAD_NODE_SSH_PRIVATE_KEY_PASSPHRASE,
    LOAD_NODE_SSH_PRIVATE_KEY_PATH,
    LOAD_NODE_SSH_USER,
    LOAD_NODES,
)
from frostfs_testlib.shell.interfaces import SshCredentials
from frostfs_testlib.storage.cluster import ClusterNode
from frostfs_testlib.storage.dataclasses.frostfs_services import S3Gate, StorageNode
from frostfs_testlib.storage.dataclasses.wallet import WalletInfo
from frostfs_testlib.testing.test_control import run_optionally
from frostfs_testlib.utils import datetime_utils

reporter = get_reporter()


class BackgroundLoadController:
    k6_instances: list[K6]
    k6_dir: str
    load_params: LoadParams
    original_load_params: LoadParams
    load_nodes: list[str]
    verification_params: LoadParams
    nodes_under_load: list[ClusterNode]
    load_counter: int
    ssh_credentials: SshCredentials
    loaders_wallet: WalletInfo
    load_summaries: dict
    endpoints: list[str]

    def __init__(
        self,
        k6_dir: str,
        load_params: LoadParams,
        loaders_wallet: WalletInfo,
        nodes_under_load: list[ClusterNode],
    ) -> None:
        self.k6_dir = k6_dir
        self.original_load_params = load_params
        self.load_params = copy.deepcopy(self.original_load_params)
        self.nodes_under_load = nodes_under_load
        self.load_counter = 1
        self.load_nodes = LOAD_NODES
        self.loaders_wallet = loaders_wallet

        if load_params.endpoint_selection_strategy is None:
            raise RuntimeError("endpoint_selection_strategy should not be None")

        self.endpoints = self._get_endpoints(
            load_params.load_type, load_params.endpoint_selection_strategy
        )

        self.ssh_credentials = SshCredentials(
            LOAD_NODE_SSH_USER,
            LOAD_NODE_SSH_PASSWORD,
            LOAD_NODE_SSH_PRIVATE_KEY_PATH,
            LOAD_NODE_SSH_PRIVATE_KEY_PASSPHRASE,
        )

    @run_optionally(optionals.OPTIONAL_BACKGROUND_LOAD_ENABLED, [])
    def _get_endpoints(
        self, load_type: LoadType, endpoint_selection_strategy: EndpointSelectionStrategy
    ):
        all_endpoints = {
            LoadType.gRPC: {
                EndpointSelectionStrategy.ALL: list(
                    set(
                        endpoint
                        for node_under_load in self.nodes_under_load
                        for endpoint in node_under_load.service(StorageNode).get_all_rpc_endpoint()
                    )
                ),
                EndpointSelectionStrategy.FIRST: list(
                    set(
                        node_under_load.service(StorageNode).get_rpc_endpoint()
                        for node_under_load in self.nodes_under_load
                    )
                ),
            },
            # for some reason xk6 appends http protocol on its own
            LoadType.S3: {
                EndpointSelectionStrategy.ALL: list(
                    set(
                        endpoint.replace("http://", "")
                        for node_under_load in self.nodes_under_load
                        for endpoint in node_under_load.service(S3Gate).get_all_endpoints()
                    )
                ),
                EndpointSelectionStrategy.FIRST: list(
                    set(
                        node_under_load.service(S3Gate).get_endpoint().replace("http://", "")
                        for node_under_load in self.nodes_under_load
                    )
                ),
            },
        }

        return all_endpoints[load_type][endpoint_selection_strategy]

    @run_optionally(optionals.OPTIONAL_BACKGROUND_LOAD_ENABLED)
    @reporter.step_deco("Prepare background load instances")
    def prepare(self):
        if self.load_params.load_type == LoadType.S3:
            init_s3_client(
                self.load_nodes,
                self.load_params,
                self.k6_dir,
                self.ssh_credentials,
                self.nodes_under_load,
                self.loaders_wallet,
            )

        self._prepare(self.load_params)

    def _prepare(self, load_params: LoadParams):
        self.k6_instances = prepare_k6_instances(
            load_nodes=LOAD_NODES,
            ssh_credentials=self.ssh_credentials,
            k6_dir=self.k6_dir,
            load_params=load_params,
            endpoints=self.endpoints,
            loaders_wallet=self.loaders_wallet,
        )

    @run_optionally(optionals.OPTIONAL_BACKGROUND_LOAD_ENABLED)
    @reporter.step_deco("Start background load")
    def start(self):
        if self.load_params.preset is None:
            raise RuntimeError("Preset should not be none at the moment of start")

        with reporter.step(
            f"Start background load on nodes {self.nodes_under_load}: "
            f"writers = {self.load_params.writers}, "
            f"obj_size = {self.load_params.object_size}, "
            f"load_time = {self.load_params.load_time}, "
            f"prepare_json = {self.load_params.preset.pregen_json}, "
            f"endpoints = {self.endpoints}"
        ):
            for k6_load_instance in self.k6_instances:
                k6_load_instance.start()

        wait_after_start_time = datetime_utils.parse_time(self.load_params.setup_timeout) + 5
        with reporter.step(
            f"Wait for start timeout + couple more seconds ({wait_after_start_time}) before moving on"
        ):
            time.sleep(wait_after_start_time)

    @run_optionally(optionals.OPTIONAL_BACKGROUND_LOAD_ENABLED)
    @reporter.step_deco("Stop background load")
    def stop(self):
        for k6_load_instance in self.k6_instances:
            k6_load_instance.stop()

    @run_optionally(optionals.OPTIONAL_BACKGROUND_LOAD_ENABLED, True)
    def is_running(self):
        for k6_load_instance in self.k6_instances:
            if not k6_load_instance.is_running:
                return False

        return True

    @run_optionally(optionals.OPTIONAL_BACKGROUND_LOAD_ENABLED)
    @reporter.step_deco("Reset background load")
    def _reset_for_consequent_load(self):
        """This method is required if we want to run multiple loads during test run.
        Raise load counter by 1 and append it to load_id
        """
        self.load_counter += 1
        self.load_params = copy.deepcopy(self.original_load_params)
        self.load_params.set_id(f"{self.load_params.load_id}_{self.load_counter}")

    @run_optionally(optionals.OPTIONAL_BACKGROUND_LOAD_ENABLED)
    @reporter.step_deco("Startup background load")
    def startup(self):
        self.prepare()
        self.start()

    @run_optionally(optionals.OPTIONAL_BACKGROUND_LOAD_ENABLED)
    @reporter.step_deco("Stop and get results of background load")
    def teardown(self, load_report: LoadReport = None):
        if not self.k6_instances:
            return

        self.stop()
        self.load_summaries = self.get_results()
        self.k6_instances = []
        if load_report:
            load_report.add_summaries(self.load_summaries)

    @run_optionally(optionals.OPTIONAL_BACKGROUND_LOAD_ENABLED)
    @reporter.step_deco("Verify results of background load")
    def verify(self):
        try:
            if self.load_params.verify:
                self.verification_params = LoadParams(
                    verify_clients=self.load_params.verify_clients,
                    scenario=LoadScenario.VERIFY,
                    registry_file=self.load_params.registry_file,
                    verify_time=self.load_params.verify_time,
                    load_type=self.load_params.load_type,
                    load_id=self.load_params.load_id,
                    working_dir=self.load_params.working_dir,
                    endpoint_selection_strategy=self.load_params.endpoint_selection_strategy,
                    k6_process_allocation_strategy=self.load_params.k6_process_allocation_strategy,
                )
                self._run_verify_scenario()
                verification_summaries = self.get_results()
                self.verify_summaries(self.load_summaries, verification_summaries)
        finally:
            self._reset_for_consequent_load()

    @run_optionally(optionals.OPTIONAL_BACKGROUND_LOAD_ENABLED)
    @reporter.step_deco("Verify summaries from k6")
    def verify_summaries(self, load_summaries: dict, verification_summaries: dict):
        verifier = LoadVerifier(self.load_params)
        for node_or_endpoint in load_summaries:
            with reporter.step(f"Verify load summaries for {node_or_endpoint}"):
                verifier.verify_summaries(
                    load_summaries[node_or_endpoint], verification_summaries[node_or_endpoint]
                )

    @run_optionally(optionals.OPTIONAL_BACKGROUND_LOAD_ENABLED)
    def wait_until_finish(self):
        if self.load_params.load_time is None:
            raise RuntimeError("LoadTime should not be none")

        for k6_instance in self.k6_instances:
            k6_instance.wait_until_finished(self.load_params.load_time + int(K6_TEARDOWN_PERIOD))

    @run_optionally(optionals.OPTIONAL_BACKGROUND_LOAD_ENABLED)
    @reporter.step_deco("Run verify scenario for background load")
    def _run_verify_scenario(self):
        if self.verification_params.verify_time is None:
            raise RuntimeError("verify_time should not be none")

        self._prepare(self.verification_params)
        with reporter.step("Run verify background load data"):
            for k6_verify_instance in self.k6_instances:
                k6_verify_instance.start()
                k6_verify_instance.wait_until_finished(self.verification_params.verify_time)

    @run_optionally(optionals.OPTIONAL_BACKGROUND_LOAD_ENABLED)
    @reporter.step_deco("K6 run results")
    def get_results(self) -> dict:
        results = {}
        for k6_instance in self.k6_instances:
            if k6_instance.load_params.k6_process_allocation_strategy is None:
                raise RuntimeError("k6_process_allocation_strategy should not be none")

            result = k6_instance.get_results()
            keys_map = {
                K6ProcessAllocationStrategy.PER_LOAD_NODE: k6_instance.load_node,
                K6ProcessAllocationStrategy.PER_ENDPOINT: k6_instance.endpoints[0],
            }
            key = keys_map[k6_instance.load_params.k6_process_allocation_strategy]
            results[key] = result

        return results