#!/usr/bin/env python3
# Copyright 2022 Memgraph Ltd.
#
# Use of this software is governed by the Business Source License
# included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
# License, and you may not use this file except in compliance with the Business Source License.
#
# As of the Change Date specified in that file, in accordance with
# the Business Source License, use of this software will be governed
# by the Apache License, Version 2.0, included in the file
# licenses/APL.txt.

# TODO(gitbuda): Add action to print the context/cluster.
# TODO(gitbuda): Add action to print logs of each Memgraph instance.
# TODO(gitbuda): Polish naming within script.
# TODO(gitbuda): Consider moving this somewhere higher in the project or even put inside GQLAlchemy.

# The idea here is to implement simple interactive runner of Memgraph instances because:
#   * it should be possible to manually create new test cases first
#     by just running this script and executing command manually from e.g. mgconsole,
#     running single instance of Memgraph is easy but running multiple instances and
#     controlling them is not that easy
#   * it should be easy to create new operational test without huge knowledge overhead
#     by e.g. calling `process_actions` from any e2e Python test, the test will contain the
#     string with all actions and should run test code in a different thread.
#
# NOTE: The intention here is not to provide infrastructure to write data
# correctness tests or any heavy workload, the intention is to being able to
# easily test e2e "operational" cases, simple cluster setup and basic Memgraph
# operational queries. For any type of data correctness tests Jepsen or similar
# approaches have to be employed.
# NOTE: The instance description / context should be compatible with tests/e2e/runner.py

import atexit
import logging
import os
import sys
import tempfile
import time
from argparse import ArgumentParser
from inspect import signature

import yaml

from memgraph import MemgraphInstanceRunner, extract_bolt_port

SCRIPT_DIR = os.path.dirname(os.path.realpath(__file__))
PROJECT_DIR = os.path.normpath(os.path.join(SCRIPT_DIR, "..", ".."))
BUILD_DIR = os.path.join(PROJECT_DIR, "build")
MEMGRAPH_BINARY = os.path.join(BUILD_DIR, "memgraph")

# Cluster description, injectable as the context.
# If the script argument is not provided, the following will be used as a default.
MEMGRAPH_INSTANCES_DESCRIPTION = {
    "replica1": {
        "args": ["--bolt-port", "7688", "--log-level=TRACE"],
        "log_file": "replica1.log",
        "setup_queries": ["SET REPLICATION ROLE TO REPLICA WITH PORT 10001;"],
    },
    "replica2": {
        "args": ["--bolt-port", "7689", "--log-level=TRACE"],
        "log_file": "replica2.log",
        "setup_queries": ["SET REPLICATION ROLE TO REPLICA WITH PORT 10002;"],
    },
    "main": {
        "args": ["--bolt-port", "7687", "--log-level=TRACE"],
        "log_file": "main.log",
        "setup_queries": [
            "REGISTER REPLICA replica1 SYNC TO '127.0.0.1:10001'",
            "REGISTER REPLICA replica2 SYNC TO '127.0.0.1:10002'",
        ],
    },
}
MEMGRAPH_INSTANCES = {}
ACTIONS = {
    "info": lambda context: info(context),
    "stop": lambda context, name: stop(context, name),
    "start": lambda context, name: start(context, name),
    "sleep": lambda _, delta: time.sleep(float(delta)),
    "exit": lambda _: sys.exit(1),
    "quit": lambda _: sys.exit(1),
}

CLEANUP_DIRECTORIES_ON_EXIT = False

log = logging.getLogger("memgraph.tests.e2e")


def load_args():
    parser = ArgumentParser()
    parser.add_argument("--actions", required=False, help="What actions to run", default="")
    parser.add_argument(
        "--context-yaml",
        required=False,
        help="YAML file with the cluster description",
        default="",
    )
    return parser.parse_args()


def is_port_in_use(port: int) -> bool:
    import socket

    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
        return s.connect_ex(("localhost", port)) == 0


def _start_instance(
    name, args, log_file, setup_queries, use_ssl, procdir, data_directory, username=None, password=None
):
    assert (
        name not in MEMGRAPH_INSTANCES.keys()
    ), "If this raises, you are trying to start an instance with the same name than one already running."
    assert not is_port_in_use(
        extract_bolt_port(args)
    ), "If this raises, you are trying to start an instance on a port already used by one already running instance."

    log_file_path = os.path.join(BUILD_DIR, "logs", log_file)
    data_directory_path = os.path.join(BUILD_DIR, data_directory)
    mg_instance = MemgraphInstanceRunner(
        MEMGRAPH_BINARY, use_ssl, {data_directory_path}, username=username, password=password
    )
    MEMGRAPH_INSTANCES[name] = mg_instance
    binary_args = args + ["--log-file", log_file_path] + ["--data-directory", data_directory_path]

    if len(procdir) != 0:
        binary_args.append("--query-modules-directory=" + procdir)

    mg_instance.start(args=binary_args, setup_queries=setup_queries)
    assert mg_instance.is_running(), "An error occured after starting Memgraph instance: application stopped running."


def stop_all(keep_directories=True):
    for mg_instance in MEMGRAPH_INSTANCES.values():
        mg_instance.stop(keep_directories)
    MEMGRAPH_INSTANCES.clear()


def stop_instance(context, name, keep_directories=True):
    for key, _ in context.items():
        if key != name:
            continue
        MEMGRAPH_INSTANCES[name].stop(keep_directories)
        MEMGRAPH_INSTANCES.pop(name)


def stop(context, name, keep_directories=True):
    if name != "all":
        stop_instance(context, name, keep_directories)
        return

    stop_all()


def kill(context, name, keep_directories=True):
    for key in context.keys():
        if key != name:
            continue
        MEMGRAPH_INSTANCES[name].kill(keep_directories)
        MEMGRAPH_INSTANCES.pop(name)


def kill_all(context, keep_directories=True):
    for key in MEMGRAPH_INSTANCES.keys():
        MEMGRAPH_INSTANCES[key].kill(keep_directories)
    MEMGRAPH_INSTANCES.clear()


def cleanup_directories_on_exit(value=True):
    CLEANUP_DIRECTORIES_ON_EXIT = value


@atexit.register
def cleanup():
    stop_all(CLEANUP_DIRECTORIES_ON_EXIT)


def start_instance(context, name, procdir):
    mg_instances = {}

    for key, value in context.items():
        if key != name:
            continue
        args = value["args"]
        log_file = value["log_file"]
        queries = []
        if "setup_queries" in value:
            queries = value["setup_queries"]
        use_ssl = False
        if "ssl" in value:
            use_ssl = bool(value["ssl"])
            value.pop("ssl")
        data_directory = ""
        if "data_directory" in value:
            data_directory = value["data_directory"]
        else:
            data_directory = tempfile.TemporaryDirectory().name
        username = None
        if "username" in value:
            username = value["username"]
        password = None
        if "password" in value:
            password = value["password"]

        instance = _start_instance(name, args, log_file, queries, use_ssl, procdir, data_directory, username, password)
        mg_instances[name] = instance

    assert len(mg_instances) == 1


def start_all(context, procdir="", keep_directories=True):
    stop_all(keep_directories)
    for key, _ in context.items():
        start_instance(context, key, procdir)


def start_all_keep_others(context, procdir="", keep_directories=True):
    for key, _ in context.items():
        start_instance(context, key, procdir)


def start(context, name, procdir=""):
    if name != "all":
        start_instance(context, name, procdir)
        return

    start_all(context)


def info(context):
    print("{:<15s}{:>6s}".format("NAME", "STATUS"))
    for name, _ in context.items():
        if name not in MEMGRAPH_INSTANCES:
            continue
        instance = MEMGRAPH_INSTANCES[name]
        print("{:<15s}{:>6s}".format(name, "UP" if instance.is_running() else "DOWN"))


def process_actions(context, actions):
    actions = actions.split(" ")
    actions.reverse()
    while len(actions) > 0:
        name = actions.pop()
        action = ACTIONS[name]
        args_no = len(signature(action).parameters) - 1
        assert (
            args_no >= 0
        ), "Wrong action definition, each action has to accept at least 1 argument which is the context."
        assert args_no <= 1, "Actions with more than one user argument are not yet supported"
        if args_no == 0:
            action(context)
        if args_no == 1:
            action(context, actions.pop())


if __name__ == "__main__":
    args = load_args()
    logging.basicConfig(level=logging.INFO, format="%(levelname)s %(asctime)s %(name)s] %(message)s")

    if args.context_yaml == "":
        context = MEMGRAPH_INSTANCES_DESCRIPTION
    else:
        with open(args.context_yaml, "r") as f:
            context = yaml.load(f, Loader=yaml.FullLoader)
    if args.actions != "":
        process_actions(context, args.actions)
        sys.exit(0)

    while True:
        choice = input("ACTION>")
        process_actions(context, choice)