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

# Copyright 2010 - 2017 RhodeCode GmbH and the AppEnlight project authors
#
# 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.

from pyramid.view import view_config
from appenlight.models import DBSession, Datastores
from appenlight.forms import get_partition_deletion_form

import logging

from zope.sqlalchemy import mark_changed
from datetime import datetime
import sqlalchemy as sa

log = logging.getLogger(__name__)


def get_partition_stats():
    table_query = """
        SELECT table_name
        FROM information_schema.tables
        GROUP BY table_name
        ORDER BY table_name
    """

    permanent_partitions = {}
    daily_partitions = {}

    def is_int(data):
        try:
            int(data)
            return True
        except Exception:
            pass
        return False

    def add_key(key, holder):
        if not ix_time in holder:
            holder[ix_time] = {"pg": [], "elasticsearch": []}

    for partition in list(Datastores.es.indices.get_alias("rcae*")):
        if not partition.startswith("rcae"):
            continue
        split_data = partition.split("_")
        permanent = False
        # if we dont have a day then treat it as permanent partion
        if False in list(map(is_int, split_data[-3:])):
            ix_time = datetime(
                year=int(split_data[-2]), month=int(split_data[-1]), day=1
            ).date()
            permanent = True
        else:
            ix_time = datetime(
                year=int(split_data[-3]),
                month=int(split_data[-2]),
                day=int(split_data[-1]),
            ).date()

        ix_time = str(ix_time)
        if permanent:
            add_key(ix_time, permanent_partitions)
            if ix_time not in permanent_partitions:
                permanent_partitions[ix_time]["elasticsearch"] = []
            permanent_partitions[ix_time]["elasticsearch"].append(partition)
        else:
            add_key(ix_time, daily_partitions)
            if ix_time not in daily_partitions:
                daily_partitions[ix_time]["elasticsearch"] = []
            daily_partitions[ix_time]["elasticsearch"].append(partition)

    for row in DBSession.execute(table_query):
        splitted = row["table_name"].split("_")
        if "p" in splitted:
            # dealing with partition
            split_data = [int(x) for x in splitted[splitted.index("p") + 1 :]]
            if len(split_data) == 3:
                ix_time = datetime(split_data[0], split_data[1], split_data[2]).date()
                ix_time = str(ix_time)
                add_key(ix_time, daily_partitions)
                daily_partitions[ix_time]["pg"].append(row["table_name"])
            else:
                ix_time = datetime(split_data[0], split_data[1], 1).date()
                ix_time = str(ix_time)
                add_key(ix_time, permanent_partitions)
                permanent_partitions[ix_time]["pg"].append(row["table_name"])

    return permanent_partitions, daily_partitions


@view_config(
    route_name="section_view",
    permission="root_administration",
    match_param=["section=admin_section", "view=partitions"],
    renderer="json",
    request_method="GET",
)
def index(request):
    permanent_partitions, daily_partitions = get_partition_stats()

    return {
        "permanent_partitions": sorted(
            list(permanent_partitions.items()), key=lambda x: x[0], reverse=True
        ),
        "daily_partitions": sorted(
            list(daily_partitions.items()), key=lambda x: x[0], reverse=True
        ),
    }


@view_config(
    route_name="section_view",
    request_method="POST",
    match_param=["section=admin_section", "view=partitions_remove"],
    renderer="json",
    permission="root_administration",
)
def partitions_remove(request):
    permanent_partitions, daily_partitions = get_partition_stats()
    pg_partitions = []
    es_partitions = []
    for item in list(permanent_partitions.values()) + list(daily_partitions.values()):
        es_partitions.extend(item["elasticsearch"])
        pg_partitions.extend(item["pg"])
    FormCls = get_partition_deletion_form(es_partitions, pg_partitions)
    form = FormCls(
        es_index=request.unsafe_json_body["es_indices"],
        pg_index=request.unsafe_json_body["pg_indices"],
        confirm=request.unsafe_json_body["confirm"],
        csrf_context=request,
    )
    if form.validate():
        for ix in form.data["es_index"]:
            log.warning("deleting ES partition: {}".format(ix))
            Datastores.es.indices.delete(ix)
        for ix in form.data["pg_index"]:
            log.warning("deleting PG partition: {}".format(ix))
            stmt = sa.text("DROP TABLE %s CASCADE" % sa.text(ix))
            session = DBSession()
            session.connection().execute(stmt)
            mark_changed(session)

    for field, error in form.errors.items():
        msg = "%s: %s" % (field, error[0])
        request.session.flash(msg, "error")

    permanent_partitions, daily_partitions = get_partition_stats()
    return {
        "permanent_partitions": sorted(
            list(permanent_partitions.items()), key=lambda x: x[0], reverse=True
        ),
        "daily_partitions": sorted(
            list(daily_partitions.items()), key=lambda x: x[0], reverse=True
        ),
    }