"""Calc & represent docker stats data."""
from contextlib import suppress


class DockerStats(object):
    """Hold stats data from container inside."""

    def __init__(self, stats):
        """Initialize docker stats."""
        self._cpu = 0.0
        self._network_rx = 0
        self._network_tx = 0
        self._blk_read = 0
        self._blk_write = 0

        try:
            self._memory_usage = stats['memory_stats']['usage']
            self._memory_limit = stats['memory_stats']['limit']
        except KeyError:
            self._memory_usage = 0
            self._memory_limit = 0

        with suppress(KeyError):
            self._calc_cpu_percent(stats)

        with suppress(KeyError):
            self._calc_network(stats['networks'])

        with suppress(KeyError):
            self._calc_block_io(stats['blkio_stats'])

    def _calc_cpu_percent(self, stats):
        """Calculate CPU percent."""
        cpu_delta = stats['cpu_stats']['cpu_usage']['total_usage'] - \
            stats['precpu_stats']['cpu_usage']['total_usage']
        system_delta = stats['cpu_stats']['system_cpu_usage'] - \
            stats['precpu_stats']['system_cpu_usage']

        if system_delta > 0.0 and cpu_delta > 0.0:
            self._cpu = (cpu_delta / system_delta) * \
                len(stats['cpu_stats']['cpu_usage']['percpu_usage']) * 100.0

    def _calc_network(self, networks):
        """Calculate Network IO stats."""
        for _, stats in networks.items():
            self._network_rx += stats['rx_bytes']
            self._network_tx += stats['tx_bytes']

    def _calc_block_io(self, blkio):
        """Calculate block IO stats."""
        for stats in blkio['io_service_bytes_recursive']:
            if stats['op'] == 'Read':
                self._blk_read += stats['value']
            elif stats['op'] == 'Write':
                self._blk_write += stats['value']

    @property
    def cpu_percent(self):
        """Return CPU percent."""
        return self._cpu

    @property
    def memory_usage(self):
        """Return memory usage."""
        return self._memory_usage

    @property
    def memory_limit(self):
        """Return memory limit."""
        return self._memory_limit

    @property
    def network_rx(self):
        """Return network rx stats."""
        return self._network_rx

    @property
    def network_tx(self):
        """Return network rx stats."""
        return self._network_tx

    @property
    def blk_read(self):
        """Return block IO read stats."""
        return self._blk_read

    @property
    def blk_write(self):
        """Return block IO write stats."""
        return self._blk_write