# Copyright (c) Facebook, Inc. and its affiliates.

# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.

from __future__ import absolute_import, division, print_function, unicode_literals

import os
import tarfile
import tempfile
from datetime import datetime, timedelta
from enum import Enum

import docker
from six import BytesIO
from wadebug.wa_actions.models.wa_container import WAContainer


WA_WEBAPP_CONTAINER_TAG = "whatsapp.biz/web"
WA_COREAPP_CONTAINER_TAG = "whatsapp.biz/coreapp"
MYSQL_CONTAINER_TAG = "mysql"
CONTAINER_RUNNING = "running"
DATE_FORMAT = "%Y-%m-%d %H:%M:%S"
EXPIRED_DATE_FORMAT = "%Y-%m-%d"
LIFETIME_OF_BETA_BUILD_IN_DAYS = 45
LIFETIME_OF_BUILD_IN_DAYS = 180
TEMP_TAR_FILENAME = "temp.tar"


def get_all_containers():
    client = docker.from_env()
    return client.containers.list(all=True)


def get_container_logs(container, since_datetime=None, until_datetime=None):
    return container.logs(since=since_datetime, until=until_datetime)


def get_inspect_result(container):
    client = docker.from_env()
    res = client.api.inspect_container(container.short_id)
    # hide password
    for index, value in enumerate(res["Config"]["Env"]):
        if value.lower().find("password") != -1:
            arr = value.split("=")
            res["Config"]["Env"][index] = arr[0] + "*******"
    return res


def get_core_dump_logs(container):
    client = docker.from_env()
    files_changed = client.api.diff(container.short_id)
    coredump_logs = []
    for file_change in files_changed:
        file_change_type = file_change["Kind"]
        full_path = file_change["Path"]
        # the crash files should have names like:
        # /usr/local/waent/logs/wa-service-bffb11a7-crash.log
        if (
            "-crash.log" in full_path
            and file_change_type != DockerDiffFileChange.DELETED
        ):
            folder_path, file_name = full_path.rsplit("/", 1)
            coredump = get_archive_from_container(container, folder_path, file_name)
            coredump_logs.append(coredump)
    result = "\n".join(coredump_logs)
    return result


def get_archive_from_container(container, path, file_name):
    with tempfile.NamedTemporaryFile() as destination:
        stream, stat = container.get_archive(os.path.join(path, file_name))
        for data in stream:
            destination.write(data)
        destination.seek(0)
        retrieved_data = untar_file(destination, file_name)
        retrieved_data = retrieved_data.decode("utf-8")
        return retrieved_data


# https://docker-py.readthedocs.io/en/1.5.0/api/#get_archive
# 'docker sdk' for get-archive returns tuple. In which, first element is a raw tar data stream.
# We should untar this file to read content.
# The reason it gives tar file is path to get_archive() can be a folder instead of just a file
def untar_file(tardata, file_name):
    with tarfile.open(mode="r", fileobj=tardata) as t:
        f = t.extractfile(file_name)
        result = f.read()
        f.close()
    return result


def put_archive_to_container(container, src, dest):
    with tempfile.NamedTemporaryFile() as temptar:  # tempfile backed tarfile
        file_data = open(src, "rb").read()
        tar_file = tarfile.open(fileobj=temptar, mode="w")
        tarinfo = tarfile.TarInfo(name=os.path.basename(src))
        tarinfo.size = os.stat(src).st_size
        tar_file.addfile(tarinfo, BytesIO(file_data))
        tar_file.close()
        temptar.flush()
        temptar.seek(0)
        container.put_archive(dest, temptar.read())


def write_to_file_in_binary(path, content):
    with open(path, "wb") as file:
        file.write(content)
        file.close()


def write_to_file(path, content):
    with open(path, "w") as file:
        file.write(content)
        file.close()


def get_wa_version_from_container(container):
    return get_version(container.image.attrs["RepoTags"][0].split(":")[1])


def get_running_wacore_containers():
    return [c.container for c in get_running_wa_containers() if c.is_coreapp()]


def get_running_waweb_containers():
    return [c.container for c in get_running_wa_containers() if c.is_webapp()]


def get_running_wa_containers():
    return [c for c in get_wa_containers() if c.is_running()]


def get_wa_containers():
    """Return all probably relevant containers, including MySQL, if exists."""
    return [WAContainer(c) for c in get_all_containers() if is_wa_container(c)]


def is_wa_container(container):
    return (
        len(
            [
                repo_tag
                for repo_tag in container.image.attrs["RepoTags"]
                if (
                    repo_tag.find(WA_WEBAPP_CONTAINER_TAG) > -1
                    or repo_tag.find(WA_COREAPP_CONTAINER_TAG) > -1
                    or repo_tag.find(MYSQL_CONTAINER_TAG) > -1
                )
            ]
        )
        > 0
    )


def is_container_running(container):
    return container.status == CONTAINER_RUNNING


def get_all_running_wa_containers_except_db():
    return [c.container for c in get_running_wa_containers() if not c.is_db()]


def get_mysql_password(wa_container):
    client = docker.from_env()
    res = client.api.inspect_container(wa_container.container.short_id)
    for _, value in enumerate(res["Config"]["Env"]):
        if value.find("MYSQL_ROOT_PASSWORD") != -1:
            arr = value.split("=")
            return arr[1]
    return ""


def get_value_by_inspecting_container_environment(container, key_in_config):
    client = docker.from_env()
    res = client.api.inspect_container(container.short_id)
    for _, value in enumerate(res["Config"]["Env"]):
        if value.find(key_in_config) != -1:
            arr = value.split("=")
            return arr[1]
    return ""


def get_container_port_bindings(container):
    return container.attrs["HostConfig"]["PortBindings"]


def is_beta_build(version_number):
    return int(version_number) % 2 == 0


def get_version(version):
    """
    It returns the version in format of v2.{major version}.{minor version}.

    All beta builds are marked 2.{even_number}.*. Expiry date for these is image create date + 45 days
    All external builds are 2.{odd_number}.*. Expiry date for all 2.{odd_number}.* is same.
    Although 2.19.* is for external users, expiry date for these builds are image_create_date + 180 days
    So, this function returns
      if version >= v2.21.1 or if it's not a internal build
          (v2.{major version}, v2.{major version}.{minor version})
         Ex : i.e for 2.21.1 it returns (v2.21,v2.21.1)
      otherwise
          (v2.{major version}.{minor version}, v2.{major version}.{minor version})
          Ex : i.e for 2.20.2 it returns (v2.20.2,v2.20.2)
    """
    arr = version.split(".")
    if is_beta_build(arr[1]) or int(arr[1]) <= 19:
        return (version, version)
    return (arr[0] + "." + arr[1], version)


def get_expiration_map():
    def is_wa_image(image):
        if not image["RepoDigests"]:
            return False
        for repo_tag in image["RepoDigests"]:
            return (
                repo_tag.find(WA_WEBAPP_CONTAINER_TAG) > -1
                or repo_tag.find(WA_COREAPP_CONTAINER_TAG) > -1
            )

    client = docker.from_env()
    images = client.api.images()
    expiration_map = {}
    for image in images:
        if is_wa_image(image):
            ver = get_version(image["RepoTags"][0].split(":")[1])
            if ver[0] not in expiration_map:
                if "Labels" in image and "EXPIRES_ON" in image["Labels"]:
                    dt_ts = datetime.strptime(
                        image["Labels"]["EXPIRES_ON"], EXPIRED_DATE_FORMAT
                    )
                    expiration_map[ver[0]] = str(dt_ts)
                    continue
                ts = get_expiry_date(ver[0], image["Created"])
                expiration_map[ver[0]] = ts
    return expiration_map


def get_expiry_date(version, ts):
    arr = version.split(".")
    str_ts = datetime.utcfromtimestamp(ts).strftime(DATE_FORMAT)
    dt_ts = datetime.strptime(str_ts, DATE_FORMAT)
    expiry_date = ""
    if is_beta_build(arr[1]):
        expiry_date = dt_ts + timedelta(LIFETIME_OF_BETA_BUILD_IN_DAYS)
    else:
        expiry_date = dt_ts + timedelta(LIFETIME_OF_BUILD_IN_DAYS)
    return str(expiry_date)


class DockerDiffFileChange(Enum):
    CREATED = 0
    MODIFIED = 1
    DELETED = 2