import array
import logging
from typing import List, Dict, Tuple

from . import utils
from .test_run_class import TestRun
from . import sensors_rpc_plugin
from .stage import Stage, StepOrder

plugin_fname = sensors_rpc_plugin.__file__.rsplit(".", 1)[0] + ".py"
SENSORS_PLUGIN_CODE = open(plugin_fname, "rb").read()


logger = logging.getLogger("wally")


# TODO(koder): in case if node has more than one role sensor settings might be incorrect
class StartSensorsStage(Stage):
    priority = StepOrder.START_SENSORS
    config_block = 'sensors'

    def run(self, ctx: TestRun) -> None:
        if  array.array('L').itemsize != 8:
            message = "Python array.array('L') items should be 8 bytes in size, not {}." + \
                " Can't provide sensors on this platform. Disable sensors in config and retry"
            logger.critical(message.format(array.array('L').itemsize))
            raise utils.StopTestError()

        per_role_config = {}  # type: Dict[str, Dict[str, str]]

        for name, val in ctx.config.sensors.roles_mapping.raw().items():
            if isinstance(val, str):
                val = {vl.strip(): ".*" for vl in val.split(",")}
            elif isinstance(val, list):
                val = {vl: ".*" for vl in val}
            per_role_config[name] = val

        if 'all' in per_role_config:
            all_vl = per_role_config.pop('all')
            all_roles = set(per_role_config)

            for node in ctx.nodes:
                all_roles.update(node.info.roles)

            for name, vals in list(per_role_config.items()):
                new_vals = all_vl.copy()
                new_vals.update(vals)
                per_role_config[name] = new_vals

        for node in ctx.nodes:
            node_cfg = {}  # type: Dict[str, Dict[str, str]]
            for role in node.info.roles:
                node_cfg.update(per_role_config.get(role, {}))

            nid = node.info.node_id()
            if node_cfg:
                # ceph requires additional settings
                if 'ceph' in node_cfg:
                    node_cfg['ceph'].update(node.info.params['ceph'])
                    node_cfg['ceph']['osds'] = [osd.id for osd in node.info.params['ceph-osds']]

                logger.debug("Setting up sensort RPC plugin for node %s", nid)
                node.upload_plugin("sensors", SENSORS_PLUGIN_CODE)
                ctx.sensors_run_on.add(nid)
                logger.debug("Start monitoring node %s", nid)
                node.conn.sensors.start(node_cfg)
            else:
                logger.debug("Skip monitoring node %s, as no sensors selected", nid)


def collect_sensors_data(ctx: TestRun, stop: bool = False):
    for node in ctx.nodes:
        node_id = node.info.node_id()
        if node_id in ctx.sensors_run_on:

            if stop:
                func = node.conn.sensors.stop
            else:
                func = node.conn.sensors.get_updates

            data, collected_at_b = func()  # type: Dict[Tuple[bytes, bytes], List[int]], List[float]

            collected_at = array.array('f')
            collected_at.frombytes(collected_at_b)

            mstore = ctx.storage.sub_storage("metric", node_id)
            for (source_name, sensor_name), values_b in data.items():
                values = array.array('Q')
                values.frombytes(values_b)
                mstore.append(values, source_name, sensor_name.decode("utf8"))
                mstore.append(collected_at, "collected_at")


class CollectSensorsStage(Stage):
    priority = StepOrder.COLLECT_SENSORS
    config_block = 'sensors'

    def run(self, ctx: TestRun) -> None:
        collect_sensors_data(ctx, True)


# def delta(func, only_upd=True):
#     prev = {}
#     while True:
#         for dev_name, vals in func():
#             if dev_name not in prev:
#                 prev[dev_name] = {}
#                 for name, (val, _) in vals.items():
#                     prev[dev_name][name] = val
#             else:
#                 dev_prev = prev[dev_name]
#                 res = {}
#                 for stat_name, (val, accum_val) in vals.items():
#                     if accum_val:
#                         if stat_name in dev_prev:
#                             delta = int(val) - int(dev_prev[stat_name])
#                             if not only_upd or 0 != delta:
#                                 res[stat_name] = str(delta)
#                         dev_prev[stat_name] = val
#                     elif not only_upd or '0' != val:
#                         res[stat_name] = val
#
#                 if only_upd and len(res) == 0:
#                     continue
#                 yield dev_name, res
#         yield None, None
#
#