import random
import re
from datetime import datetime, timezone

import allure
import pytest
from frostfs_testlib import reporter
from frostfs_testlib.steps.metrics import get_metrics_value
from frostfs_testlib.storage.cluster import ClusterNode
from frostfs_testlib.storage.controllers.cluster_state_controller import ClusterStateController
from frostfs_testlib.storage.controllers.state_managers.config_state_manager import ConfigStateManager
from frostfs_testlib.storage.dataclasses.frostfs_services import StorageNode
from frostfs_testlib.testing.cluster_test_base import ClusterTestBase
from frostfs_testlib.testing.test_control import wait_for_success


@pytest.mark.nightly
@pytest.mark.metrics
class TestLogsMetrics(ClusterTestBase):
    @pytest.fixture
    def revert_all(self, cluster_state_controller: ClusterStateController):
        yield
        cluster_state_controller.manager(ConfigStateManager).revert_all()

    def restart_storage_service(self, cluster_state_controller: ClusterStateController) -> datetime:
        config_manager = cluster_state_controller.manager(ConfigStateManager)
        config_manager.csc.stop_services_of_type(StorageNode)
        restart_time = datetime.now(timezone.utc)
        config_manager.csc.start_services_of_type(StorageNode)
        return restart_time

    @wait_for_success(interval=10)
    def check_metrics_in_node(self, cluster_node: ClusterNode, restart_time: datetime, log_priority: str = None, **metrics_greps):
        current_time = datetime.now(timezone.utc)
        counter_metrics = get_metrics_value(cluster_node, **metrics_greps)
        counter_logs = self.get_count_logs_by_level(cluster_node, metrics_greps.get("level"), restart_time, current_time, log_priority)
        assert counter_logs == pytest.approx(
            counter_metrics, rel=0.02
        ), f"counter_logs: {counter_logs}, counter_metrics: {counter_metrics} in node: {cluster_node}"

    @staticmethod
    def get_count_logs_by_level(cluster_node: ClusterNode, log_level: str, after_time: datetime, until_time: datetime, log_priority: str):
        count_logs = 0
        try:
            logs = cluster_node.host.get_filtered_logs(
                log_level, unit="frostfs-storage", since=after_time, until=until_time, priority=log_priority
            )
            result = re.findall(rf":\s+{log_level}\s+", logs)
            count_logs += len(result)
        except RuntimeError as e:
            ...
        return count_logs

    @allure.title("Metrics for the log counter")
    def test_log_counter_metrics(self, cluster_state_controller: ClusterStateController, revert_all):
        restart_time = self.restart_storage_service(cluster_state_controller)
        with reporter.step("Select random node"):
            node = random.choice(self.cluster.cluster_nodes)

        with reporter.step(f"Check metrics count logs with level 'info'"):
            self.check_metrics_in_node(
                node,
                restart_time,
                log_priority="6..6",
                command="frostfs_node_logger_entry_count",
                level="info",
                dropped="false",
            )

        with reporter.step(f"Check metrics count logs with level 'error'"):
            self.check_metrics_in_node(node, restart_time, command="frostfs_node_logger_entry_count", level="error", dropped="false")