def do_get(url, method) -> str:
    import requests

    resp = requests.get(f"{url}{method}")
    if resp.status_code != 200:
        raise ValueError(f"unexpected http error {resp.status_code}")

    return resp.text


def do_post(url, method, data) -> str:
    import requests

    resp = requests.post(f"{url}{method}", data=data)
    if resp.status_code != 200:
        raise ValueError(f"unexpected http error {resp.status_code}")

    return resp.text


def format_manager_directory(mgr_name) -> str:
    import os

    dir = os.path.join(config["reports_dir"], mgr_name)
    return dir


def make_manager_directory(mgr_name):
    import os

    os.makedirs(format_manager_directory(mgr_name), exist_ok=True)


def get_arrays_diff(old, cur) -> str:
    old_set = set(old)

    not_changed = []
    new = []

    for item in cur:
        if item in old_set:
            old_set.remove(item)
            not_changed.append(item)
        else:
            new.append(item)

    return {
        "not_changed": not_changed,
        "new": new,
        "removed": list(old_set),
    }


def manager_write_state(mgr, method, new_state):
    import os
    from datetime import datetime

    dir = format_manager_directory(mgr)

    file = os.path.join(dir, f"{method}.state")
    if not os.path.exists(file):
        os.close(os.open(file, os.O_CREAT))
        with open(os.path.join(dir, f"{method}.diff"), "w") as f:
            f.write("time,not_changed,new,removed\n")

    old_state = []
    with open(file, "r") as f:
        old_state = [line.strip() for line in f.readlines()]

    diff = get_arrays_diff(old_state, new_state)

    with open(file, "w") as f:
        f.write("\n".join(new_state))

    file = os.path.join(dir, f"{method}.diff")
    time = datetime.now().isoformat()
    with open(file, "a") as f:
        f.write(
            f"{time},{len(diff['not_changed'])},{len(diff['new'])},{len(diff['removed'])}\n"
        )

    file = f"{file}.detail"
    with open(file, "a") as f:
        f.write("Time: {}\n\n".format(time))
        for line in diff["new"]:
            f.write(f"+ {line}\n")

        for line in diff["removed"]:
            f.write(f"- {line}\n")
        f.write("===\n")


def parse_metrics(mgr, method, raw_main_page) -> str:
    import os
    from bs4 import BeautifulSoup
    from datetime import datetime

    metrics = {"time": datetime.now().isoformat()}

    soup = BeautifulSoup(raw_main_page, "html.parser")
    body = soup.find("body")

    metrics = body.find_all("table", class_=["list_table"])[0:1]
    if len(metrics) == 0:
        return ""
    metrics = metrics[0]

    header_row = []
    data_row = []
    for row in metrics.find_all("tr"):

        is_header = True
        for elem in row.find_all("td"):
            if is_header:
                header_row.append(elem.text.strip())
                is_header = False
            else:
                data_row.append(elem.text.strip())

    dir = format_manager_directory(mgr)

    file = os.path.join(dir, f"{method}.state")
    if not os.path.exists(file):
        header = ",".join(header_row)
    else:
        with open(file, "r") as f:
            header = "".join(f.readlines())

    data = ",".join(data_row)

    return f"{header}\n{data}"


def parse_crashes(mgr, raw_main_page) -> str:
    from bs4 import BeautifulSoup

    soup = BeautifulSoup(raw_main_page, "html.parser")
    body = soup.find("body")

    crashes = body.find_all("table", class_=["list_table"])[1:2]
    if len(crashes) == 0:
        return ""
    crashes = crashes[0]

    result = ["title,stat,time,repro"]
    for row in crashes.find_all("tr"):
        row_list = []

        for elem in row.find_all("td"):
            row_list.append(elem.text.strip())

        if len(row_list) == 0:
            continue

        result.append(",".join(row_list))

    return "\n".join(result)


def check_and_setup_expert_mode(manager):
    from bs4 import BeautifulSoup

    raw_main_page = do_get(manager["http_url"], "/")
    soup = BeautifulSoup(raw_main_page, "html.parser")
    form = soup.find("form")

    buttons_clicked = form.find_all("button", {"class": "action_button_selected"})[0:1]
    if len(buttons_clicked) == 1 and buttons_clicked[0]["value"] == "expert":
        return

    do_post(manager["http_url"], "/action", {"toggle": "expert", "url": "/"})
    print(f"enabled expert mode for {manager['name']}")


async def collect_manager_information(manager, endpoint):
    from datetime import datetime

    print(f"{datetime.now()}: collecting info from {manager['name']}, {endpoint['name']}")

    try:
        data = do_get(manager["http_url"], endpoint["http_uri"])
    except Exception as e:
        print(
            f"Failed to get information from manager {manager['name']} using endpoint {endpoint['name']}"
        )
        print(e)
        return

    try:
        if endpoint.get("metrics", False):
            data = parse_metrics(manager["name"], endpoint["name"], data)
        elif endpoint.get("crashes", False):
            data = parse_crashes(manager["name"], data)
        state = data.split("\n")
    except:
        print(
            f"Failed to parse information from manager {manager['name']}, endpoint: {endpoint['name']}"
        )
        return

    try:
        manager_write_state(manager["name"], endpoint["name"], state)
    except:
        print(
            f"Failed to log manager {manager['name']} state, endpoint: {endpoint['name']}"
        )


async def schedule_information_gathering():
    import asyncio

    for manager in config["managers"]:
        if manager["need_expert_mode"]:
            check_and_setup_expert_mode(manager)

        for endpoint in config["endpoints"]:
            asyncio.create_task(collect_manager_information(manager, endpoint))


async def main():
    import asyncio

    for manager in config["managers"]:
        make_manager_directory(manager["name"])

    while True:
        await asyncio.gather(
            schedule_information_gathering(),
            asyncio.sleep(config["timeout"]),
        )


if __name__ == "__main__":
    import json
    import asyncio
    import signal


    with open("./config.json", "r") as f:
        config = json.load(f)

    aio_loop = asyncio.get_event_loop()
    main_task = asyncio.ensure_future(main())

    for sig in [signal.SIGINT, signal.SIGTERM]:
        aio_loop.add_signal_handler(sig, main_task.cancel)

    try:
        aio_loop.run_until_complete(main_task)
    finally:
        aio_loop.close()