# Copyright (C) 2010-2014 GRNET S.A.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.


import logging

from django.core.exceptions import ObjectDoesNotExist

from astakos.im.models import Project
from astakos.im.quotas import get_project_quota

from synnefo.util import units
from synnefo_admin.admin.exceptions import AdminHttp404
from synnefo_admin.admin.utils import is_resource_useful


def get_actual_owner(inst):
    if inst.owner:
        return inst.owner
    try:
        return inst.members.all()[0]
    except IndexError:
        return None


def get_project_or_404(query):
    # Get by UUID
    try:
        return Project.objects.get(uuid=query)
    except ObjectDoesNotExist:
        pass

    # Get by ID
    try:
        return Project.objects.get(id=query)
    except (ObjectDoesNotExist, ValueError):
        raise AdminHttp404(
            "No Project was found that matches this query: %s\n" % query)


def get_contact_email(inst):
    owner = get_actual_owner(inst)
    if owner:
        return owner.email


def get_contact_name(inst):
    owner = get_actual_owner(inst)
    if owner:
        return owner.realname


def get_contact_id(inst):
    owner = get_actual_owner(inst)
    if owner:
        return owner.uuid


def get_policies(inst):
    policies = inst.projectresourcequota_set.all().prefetch_related('resource')
    policy_list = []

    for p in policies:
        r = p.resource
        if not is_resource_useful(r, p.project_capacity):
            continue
        policy_list.append(p)

    return policy_list


def get_project_usage(inst):
    """Return requested project quota type.

    Accepted stats are: 'project_limit', 'project_pending', 'project_usage'.
    Note that the output is sanitized, meaning that stats that correspond
    to infinite or zero limits will not be returned.
    """
    resource_list = []
    quota_dict = get_project_quota(inst)
    if not quota_dict:
        return []

    policies = get_policies(inst)
    for p in policies:
        r = p.resource
        value = units.show(quota_dict[r.name]['project_usage'], r.unit)
        resource_list.append((r.report_desc, value))

    return resource_list


def get_project_quota_category(inst, category):
    """Get the quota for project member"""
    resource_list = []
    policies = get_policies(inst)

    for p in policies:
        r = p.resource
        # Get human-readable (resource name, member capacity) tuple
        if category == "member":
            resource_list.append((r.report_desc, p.display_member_capacity()))
        elif category == "limit":
            resource_list.append((r.report_desc, p.display_project_capacity()))

    return resource_list


def display_quota_horizontally(resource_list):
    """Display resource lists in one line."""
    if not resource_list:
        return "-"
    return ', '.join((': '.join(pair) for pair in resource_list))


def display_project_usage_horizontally(inst):
    """Display the requested project stats in a one-line string."""
    resource_list = get_project_usage(inst)
    return display_quota_horizontally(resource_list)


def display_member_quota_horizontally(inst):
    """Display project resources (member or total) in one line."""
    resource_list = get_project_quota_category(inst, "member")
    return display_quota_horizontally(resource_list)


def display_project_limit_horizontally(inst):
    """Display project resources (member or total) in one line."""
    resource_list = get_project_quota_category(inst, "limit")
    return display_quota_horizontally(resource_list)