#    Copyright 2013 Mirantis, Inc.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.


# -*- coding: utf-8 -*-

import sys
import json
import Queue
import os.path
import itertools
from datetime import datetime
import jinja2
import StringIO

import sqlalchemy.types
from nailgun.settings import settings
from nailgun.api import models
from sqlalchemy import orm
from nailgun.db import orm as ormgen
from nailgun.logger import logger
from nailgun.network.manager import NetworkManager

db = ormgen()


def capitalize_model_name(model_name):
    return ''.join(map(lambda s: s.capitalize(), model_name.split('_')))


def template_fixture(fileobj, config=None):
    if not config:
        config = settings
    t = jinja2.Template(fileobj.read())
    return StringIO.StringIO(t.render(settings=config))


def upload_fixture(fileobj):
    db.expunge_all()
    fixture = json.load(template_fixture(fileobj))

    queue = Queue.Queue()
    keys = {}

    for obj in fixture:
        pk = obj["pk"]
        model_name = obj["model"].split(".")[1]

        try:
            model = itertools.dropwhile(
                lambda m: not hasattr(models, m),
                [model_name.capitalize(),
                 "".join(map(lambda n: n.capitalize(), model_name.split("_")))]
            ).next()
        except StopIteration:
            raise Exception("Couldn't find model {0}".format(model_name))

        obj['model'] = getattr(models, capitalize_model_name(model_name))
        keys[obj['model'].__tablename__] = {}

        # Check if it's already uploaded
        obj_from_db = db.query(obj['model']).get(pk)
        if obj_from_db:
            logger.info("Fixture model '%s' with pk='%s' already"
                        " uploaded. Skipping", model_name, pk)
            continue
        queue.put(obj)

    pending_objects = []

    while True:
        try:
            obj = queue.get_nowait()
        except:
            break

        new_obj = obj['model']()

        fk_fields = {}
        for field, value in obj["fields"].iteritems():
            f = getattr(obj['model'], field)
            impl = f.impl
            fk_model = None
            if hasattr(f.comparator.prop, "argument"):
                if hasattr(f.comparator.prop.argument, "__call__"):
                    fk_model = f.comparator.prop.argument()
                else:
                    fk_model = f.comparator.prop.argument.class_

            if fk_model:
                if value not in keys[fk_model.__tablename__]:
                    if obj not in pending_objects:
                        queue.put(obj)
                        pending_objects.append(obj)
                        continue
                    else:
                        logger.error(
                            u"Can't resolve foreign key "
                            "'{0}' for object '{1}'".format(
                                field,
                                obj["model"]
                            )
                        )
                        break
                else:
                    value = keys[fk_model.__tablename__][value].id

            if isinstance(impl, orm.attributes.ScalarObjectAttributeImpl):
                if value:
                    fk_fields[field] = (value, fk_model)
            elif isinstance(impl, orm.attributes.CollectionAttributeImpl):
                if value:
                    fk_fields[field] = (value, fk_model)
            elif isinstance(
                f.property.columns[0].type, sqlalchemy.types.DateTime
            ):
                if value:
                    setattr(
                        new_obj,
                        field,
                        datetime.strptime(value, "%d-%m-%Y %H:%M:%S")
                    )
                else:
                    setattr(
                        new_obj,
                        field,
                        datetime.now()
                    )
            else:
                setattr(new_obj, field, value)

        for field, data in fk_fields.iteritems():
            if isinstance(data[0], int):
                setattr(new_obj, field, db.query(data[1]).get(data[0]))
            elif isinstance(data[0], list):
                for v in data[0]:
                    getattr(new_obj, field).append(
                        db.query(data[1]).get(v)
                    )
        db.add(new_obj)
        db.commit()
        keys[obj['model'].__tablename__][obj["pk"]] = new_obj

        # UGLY HACK for testing
        if new_obj.__class__.__name__ == 'Node':
            new_obj.attributes = models.NodeAttributes()
            db.commit()
            new_obj.attributes.volumes = \
                new_obj.volume_manager.gen_default_volumes_info()
            network_manager = NetworkManager(db)
            network_manager.update_interfaces_info(new_obj)
            db.commit()


def upload_fixtures():
    fns = []
    for path in settings.FIXTURES_TO_UPLOAD:
        if not os.path.isabs(path):
            path = os.path.abspath(os.path.join(os.path.dirname(__file__),
                                                path))
        fns.append(path)

    for fn in fns:
        with open(fn, "r") as fileobj:
            upload_fixture(fileobj)
        logger.info("Fixture has been uploaded from file: %s" % fn)


def dump_fixture(model_name):
    dump = []
    app_name = 'nailgun'
    model = getattr(models, capitalize_model_name(model_name))
    for obj in db.query(model).all():
        obj_dump = {}
        obj_dump['pk'] = getattr(obj, model.__mapper__.primary_key[0].name)
        obj_dump['model'] = "%s.%s" % (app_name, model_name)
        obj_dump['fields'] = {}
        dump.append(obj_dump)
        for prop in model.__mapper__.iterate_properties:
            if isinstance(prop, sqlalchemy.orm.ColumnProperty):
                field = str(prop.key)
                value = getattr(obj, field)
                if value is None:
                    continue
                if not isinstance(value, (
                        list, dict, str, unicode, int, float, bool)):
                    value = ""
                obj_dump['fields'][field] = value
    sys.stdout.write(json.dumps(dump, indent=4))