# Copyright (c) 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.

import collections
import datetime
import json
import operator
import time

import flask

from dashboard import decorators
from dashboard import helpers
from dashboard import vault
from stackalytics.processor import utils


DEFAULT_DAYS_COUNT = 7

blueprint = flask.Blueprint('reports', __name__, url_prefix='/report')


@blueprint.route('/blueprint/<module>/<blueprint_name>')
@decorators.templated()
@decorators.exception_handler()
def blueprint_summary(module, blueprint_name):
    blueprint_id = utils.get_blueprint_id(module, blueprint_name)
    bpd = vault.get_memory_storage().get_record_by_primary_key(
        'bpd:' + blueprint_id)
    if not bpd:
        flask.abort(404)
        return

    bpd = helpers.extend_record(bpd)
    record_ids = vault.get_memory_storage().get_record_ids_by_blueprint_ids(
        [blueprint_id])
    activity = [helpers.extend_record(record) for record in
                vault.get_memory_storage().get_records(record_ids)]
    activity.sort(key=lambda x: x['date'], reverse=True)

    return {'blueprint': bpd, 'activity': activity}


def _get_day(timestamp, time_now):
    return int((time_now - timestamp) / 60 / 60 / 24)


def _process_stat(data, key, time_now):
    if not data:
        return None

    data = sorted(data, key=operator.itemgetter(key))

    days = _get_day(data[0][key], time_now)
    chart_data = [0] * (days + 1)
    sum_ages = 0
    for review in data:
        age = time_now - review[key]
        sum_ages += age
        review[key + '_age'] = utils.make_age_string(age)
        chart_data[_get_day(review[key], time_now)] += 1

    return {
        'reviews': data,
        'average': utils.make_age_string(sum_ages / len(data)),
        'max': data[0][key + '_age'],
        'chart_data': json.dumps(chart_data),
    }


@blueprint.route('/reviews/<module>/open')
@decorators.templated()
@decorators.exception_handler()
def open_reviews(module):
    memory_storage_inst = vault.get_memory_storage()
    time_now = int(time.time())

    module_id_index = vault.get_vault()['module_id_index']
    module = module.lower()
    if module in module_id_index:
        modules = module_id_index[module]['modules']
    else:
        modules = [module]

    review_ids = (memory_storage_inst.get_record_ids_by_modules(modules) &
                  memory_storage_inst.get_record_ids_by_type('review'))

    waiting_on_reviewer = []
    total_open = 0

    for review in memory_storage_inst.get_records(review_ids):
        if review['status'] == 'NEW':
            total_open += 1
            if review['value'] in [1, 2]:
                waiting_on_reviewer.append(review)

    return {
        'module': module,
        'total_open': total_open,
        'waiting_on_reviewer': len(waiting_on_reviewer),
        'waiting_on_submitter': total_open - len(waiting_on_reviewer),
        'latest_revision': _process_stat(
            waiting_on_reviewer, 'updated_on', time_now),
        'first_revision': _process_stat(waiting_on_reviewer, 'date', time_now),
    }


@blueprint.route('/contribution/<module>/<days>')
@decorators.templated()
@decorators.exception_handler()
def contribution(module, days):
    return {
        'module': module,
        'days': days,
        'start_date': int(time.time()) - int(days) * 24 * 60 * 60
    }


@blueprint.route('/registrants')
@decorators.exception_handler()
@decorators.templated()
def registrants():
    days = int(flask.request.args.get('days') or DEFAULT_DAYS_COUNT)
    return {
        'days': days
    }


def _get_punch_card_data(records):
    punch_card_raw = []  # matrix days x hours
    for wday in xrange(0, 7):
        punch_card_raw.append([0] * 24)
    for record in records:
        tt = datetime.datetime.fromtimestamp(record['date']).timetuple()
        punch_card_raw[tt.tm_wday][tt.tm_hour] += 1

    punch_card_data = []  # format for jqplot bubble renderer
    for wday in xrange(0, 7):
        for hour in xrange(0, 24):
            v = punch_card_raw[wday][hour]
            if v:
                punch_card_data.append([hour, wday, v, v])

    # add corner point, otherwise chart doesn't know the bounds
    if punch_card_raw[0][0] == 0:
        punch_card_data.append([0, 0, 0, 0])
    if punch_card_raw[6][23] == 0:
        punch_card_data.append([23, 6, 0, 0])

    return json.dumps(punch_card_data)


@blueprint.route('/users/<user_id>')
@decorators.templated()
@decorators.exception_handler()
def user_activity(user_id):
    user = vault.get_user_from_runtime_storage(user_id)
    if not user:
        flask.abort(404)
    user = helpers.extend_user(user)

    memory_storage_inst = vault.get_memory_storage()
    records = memory_storage_inst.get_records(
        memory_storage_inst.get_record_ids_by_user_ids([user_id]))
    records = sorted(records, key=operator.itemgetter('date'), reverse=True)

    return {
        'user': user,
        'total_records': len(records),
        'contribution': helpers.get_contribution_summary(records),
        'punch_card_data': _get_punch_card_data(records),
    }


@blueprint.route('/companies/<company>')
@decorators.templated()
@decorators.exception_handler()
def company_activity(company):
    memory_storage_inst = vault.get_memory_storage()
    original_name = memory_storage_inst.get_original_company_name(company)

    memory_storage_inst = vault.get_memory_storage()
    records = memory_storage_inst.get_records(
        memory_storage_inst.get_record_ids_by_companies([original_name]))
    records = sorted(records, key=operator.itemgetter('date'), reverse=True)

    return {
        'company_name': original_name,
        'total_records': len(records),
        'contribution': helpers.get_contribution_summary(records),
        'punch_card_data': _get_punch_card_data(records),
    }


@blueprint.route('/activity')
@decorators.templated()
@decorators.exception_handler()
def activity():
    pass


@blueprint.route('/large_commits')
@decorators.jsonify('commits')
@decorators.exception_handler()
@decorators.record_filter()
def get_commit_report(records):
    loc_threshold = int(flask.request.args.get('loc_threshold') or 0)
    response = []
    for record in records:
        if ('loc' in record) and (record['loc'] > loc_threshold):
            nr = dict([(k, record[k])
                       for k in ['loc', 'subject', 'module', 'primary_key',
                                 'change_id']
                       if k in record])
            response.append(nr)
    return response


@blueprint.route('/single_plus_two_reviews')
@decorators.jsonify()
@decorators.exception_handler()
@decorators.record_filter(ignore='metric')
def get_single_plus_two_reviews_report(records):
    memory_storage_inst = vault.get_memory_storage()
    plus_twos = collections.defaultdict(list)
    for record in records:
        if record['record_type'] != 'mark':
            continue

        if (record['branch'] == 'master' and record['type'] == 'CRVW' and
                record['value'] == +2):
            review_id = record['review_id']
            review = memory_storage_inst.get_record_by_primary_key(review_id)
            if review and review['status'] == 'MERGED':
                plus_twos[review_id].append(record)

    response = []
    for review_id in plus_twos.keys():
        if len(plus_twos[review_id]) < 2:
            mark = plus_twos[review_id][0]
            review = memory_storage_inst.get_record_by_primary_key(
                mark['review_id'])
            response.append({'review_by': review['user_id'],
                             'mark_by': mark['user_id'],
                             'subject': review['subject'],
                             'url': review['url'],
                             'project': review['project']})

    return response