"""
Usage interface.
"""

from novaclient import base


class Usage(base.Resource):
    """
    Usage contains infomartion about a tenants physical resource usage
    """
    def __repr__(self):
        return "<ComputeUsage>"


class UsageManager(base.ManagerWithFind):
    """
    Manage :class:`Usage` resources.
    """
    resource_class = Usage

    def list(self, start, end, detailed=False):
        """
        Get usage for all tenants

        :param start: :class:`datetime.datetime` Start date
        :param end: :class:`datetime.datetime` End date
        :param detailed: Whether to include information about each
                         instance whose usage is part of the report
        :rtype: list of :class:`Usage`.
        """
        return self._list(
                    "/os-simple-tenant-usage?start=%s&end=%s&detailed=%s" %
                    (start.isoformat(), end.isoformat(), int(bool(detailed))),
                    "tenant_usages")

    def get(self, tenant_id, start, end):
        """
        Get usage for a specific tenant.

        :param tenant_id: Tenant ID to fetch usage for
        :param start: :class:`datetime.datetime` Start date
        :param end: :class:`datetime.datetime` End date
        :rtype: :class:`Usage`
        """
        return self._get("/os-simple-tenant-usage/%s?start=%s&end=%s" %
                         (tenant_id, start.isoformat(), end.isoformat()),
                         "tenant_usage")
