#!/usr/bin/python3

# Copyright (C) 2019 The Android Open Source Project
#
# 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 argparse
import logging
import os
import random
import time

import numpy as np

import actions

LOG_PATH = "/var/logs/loadtester.log"


class LoadTestInstance:
    def __init__(self, url, user, pwd, test_duration=None):
        self.url = url
        self.user = user
        self.pwd = pwd

        self.timeout = time.time() + test_duration if test_duration else None

        self.owned_projects = set()
        self.cloned_projects = set()

        self._create_initial_projects(1)

        self.log = logging.getLogger("ActionLogger")

    def run(self):
        while True:
            if self.timeout and time.time() >= self.timeout:
                break

            self._wait_random_seconds(1, 10)

            self._exec_create_project_action()
            self._exec_list_projects_action()

            if self.owned_projects:
                self._exec_clone_project_action()

            if self.cloned_projects:
                self._exec_fetch_project_action()
                self._exec_push_commit_action()
                self._exec_push_change_action()

            self._exec_query_changes_action()
            self._exec_review_change_action()

    def _create_initial_projects(self, num_init_projects):
        for _ in range(num_init_projects):
            self.owned_projects.add(
                actions.CreateProjectAction(
                    self.url, self.user, self.pwd, 1.0
                ).execute()
            )

    @staticmethod
    def _wait_random_seconds(min_wait, max_wait):
        wait_duration = random.randint(min_wait, max_wait)
        time.sleep(wait_duration)

    @staticmethod
    def _choose_from_list_poisson(input_list):
        probabilities = np.random.poisson(20, len(input_list))
        probabilities = probabilities / np.sum(probabilities)
        return np.random.choice(input_list, 1, p=probabilities).tolist()[0]

    def _exec_create_project_action(self):
        action = actions.CreateProjectAction(self.url, self.user, self.pwd)
        project_name = action.execute()
        if not action.failed and project_name:
            self.owned_projects.add(project_name)

    def _exec_list_projects_action(self):
        action = actions.QueryProjectsAction(self.url, self.user, self.pwd)
        project_name = action.execute()
        if not action.failed and project_name:
            self.owned_projects.add(project_name)

    def _exec_clone_project_action(self):
        action = actions.CloneProjectAction(
            self.url,
            self.user,
            self.pwd,
            self._choose_from_list_poisson(list(self.owned_projects)),
        )
        action.execute()
        if not action.failed and action.was_executed:
            self.cloned_projects.add(action.project_name)

    def _exec_fetch_project_action(self):
        action = actions.FetchProjectAction(
            self._choose_from_list_poisson(list(self.cloned_projects))
        )
        action.execute()

    def _exec_push_commit_action(self):
        action = actions.PushCommitAction(
            self._choose_from_list_poisson(list(self.cloned_projects))
        )
        action.execute()

    def _exec_push_change_action(self):
        action = actions.PushChangeAction(
            self._choose_from_list_poisson(list(self.cloned_projects))
        )
        action.execute()

    def _exec_query_changes_action(self):
        action = actions.QueryChangesAction(self.url, self.user, self.pwd)
        action.execute()

    def _exec_review_change_action(self):
        action = actions.ReviewChangeAction(self.url, self.user, self.pwd)
        action.execute()


# pylint: disable=C0103
if __name__ == "__main__":

    os.makedirs(os.path.dirname(LOG_PATH), exist_ok=True)

    log_format = "%(asctime)s %(message)s"

    logging.basicConfig(
        level=logging.DEBUG, format=log_format, filename=LOG_PATH, filemode="w"
    )

    handler = logging.StreamHandler()
    handler.setLevel(logging.DEBUG)
    handler.setFormatter(logging.Formatter(log_format))
    logging.getLogger("ActionLogger").addHandler(handler)

    parser = argparse.ArgumentParser()
    parser.add_argument(
        "-U", "--url", help="Gerrit base url", dest="url", action="store", required=True
    )

    parser.add_argument(
        "-u", "--user", help="Gerrit user", dest="user", action="store", default="admin"
    )

    parser.add_argument(
        "-p",
        "--password",
        help="Gerrit password",
        dest="pwd",
        action="store",
        default="secret",
    )

    parser.add_argument(
        "-d",
        "--duration",
        help="Test duration in seconds",
        dest="duration",
        action="store",
        type=int,
        default=None,
    )

    args = parser.parse_args()

    test = LoadTestInstance(args.url, args.user, args.pwd, args.duration)
    test.run()