"""FCV and Server binary version constants used for multiversion testing."""

import glob
import http
import os
import shutil
from subprocess import DEVNULL, STDOUT, CalledProcessError, call, check_output

import requests
import structlog
from retry import retry

import buildscripts.resmokelib.config as _config
from buildscripts.resmokelib.multiversion.multiversion_service import (
    MongoReleases,
    MongoVersion,
    MultiversionService,
)
from buildscripts.resmokelib.multiversionsetupconstants import USE_EXISTING_RELEASES_FILE
from buildscripts.util.expansions import get_expansion

LAST_LTS = "last_lts"
LAST_CONTINUOUS = "last_continuous"

RELEASES_LOCAL_FILE = os.path.join("src", "mongo", "util", "version", "releases.yml")
# We use the "releases.yml" file from "master" because it is guaranteed to be up-to-date
# with the latest EOL versions. If a "last-continuous" version is EOL, we don't include
# it in the multiversion config and therefore don't test against it.
MASTER_RELEASES_REMOTE_FILE = (
    "https://raw.githubusercontent.com/mongodb/mongo/master/src/mongo/util/version/releases.yml"
)

LOGGER = structlog.getLogger(__name__)


def generate_mongo_version_file():
    """Generate the mongo version data file. Should only be called in the root of the mongo directory."""
    try:
        res = check_output("git describe", shell=True, text=True)
    except CalledProcessError as exp:
        raise ChildProcessError("Failed to run git describe to get the latest tag") from exp

    # Write the current MONGO_VERSION to a data file.
    with open(_config.MONGO_VERSION_FILE, "w") as mongo_version_fh:
        # E.g. res = 'r5.1.0-alpha-597-g8c345c6693\n'
        res = res[1:]  # Remove the leading "r" character.
        mongo_version_fh.write("mongo_version: " + res)


@retry(tries=5, delay=3)
def get_releases_file_from_remote():
    """Get the latest releases.yml from github."""
    try:
        with open(_config.RELEASES_FILE, "wb") as file:
            response = requests.get(MASTER_RELEASES_REMOTE_FILE)
            if response.status_code != http.HTTPStatus.OK:
                raise RuntimeError(
                    f"Fetching releases.yml file returned unsuccessful status: {response.status_code}, "
                    f"response body: {response.text}\n"
                )
            file.write(response.content)
        LOGGER.info(f"Got releases.yml file remotely: {MASTER_RELEASES_REMOTE_FILE}")
    except Exception as exc:
        LOGGER.warning(f"Could not get releases.yml file remotely: {MASTER_RELEASES_REMOTE_FILE}")
        raise exc


def get_releases_file_locally_or_fallback_to_remote():
    """Get the latest releases.yml locally or fallback to getting it from github."""
    if os.path.exists(RELEASES_LOCAL_FILE):
        LOGGER.info(f"Found releases.yml file locally: {RELEASES_LOCAL_FILE}")
        shutil.copyfile(RELEASES_LOCAL_FILE, _config.RELEASES_FILE)

    else:
        LOGGER.warning(f"Could not find releases.yml file locally: {RELEASES_LOCAL_FILE}")
        get_releases_file_from_remote()


def generate_releases_file():
    """Generate the releases constants file."""

    # If we are not in master, we want to grab the releases file from master as a source of truth.
    # If we are on master in CI, we can grab it locally to accommodate any changes made for testing.
    # On older versions we use the master releases.yml file to ensure we do not run multiversion
    # testing against eol versions.
    if _config.EVERGREEN_TASK_ID and get_expansion("branch_name") != "master":
        get_releases_file_from_remote()
    else:
        get_releases_file_locally_or_fallback_to_remote()


def in_git_root_dir():
    """Return True if we are in the root of a git directory."""
    try:
        if call(["git", "branch"], stderr=STDOUT, stdout=DEVNULL) != 0:
            # We are not in a git directory.
            return False
    except FileNotFoundError:
        # Git is not even installed.
        return False

    git_root_dir = os.path.realpath(
        check_output("git rev-parse --show-toplevel", shell=True, text=True).strip()
    )
    curr_dir = os.path.realpath(os.getcwd())
    return git_root_dir == curr_dir


# Check for the source dir that exists on spawnhosts
def in_spawn_host():
    if glob.glob("/data/mci/source*"):
        return True
    return False


if (in_git_root_dir() or "BUILD_WORKSPACE_DIRECTORY" in os.environ) and not in_spawn_host():
    generate_mongo_version_file()
else:
    LOGGER.info("Skipping generating mongo version file since we're not in the root of a git repo")

# Avoiding regenerating the releases file if this flag is set. Should only be set if there are
# multiple processes attempting to set up multiversion concurrently.
if not USE_EXISTING_RELEASES_FILE:
    generate_releases_file()
else:
    LOGGER.info(
        "Skipping generating releases file since the --useExistingReleasesFile flag has been set"
    )


def evg_project_str(version):
    """Return the evergreen project name for the given version."""
    return "mongodb-mongo-v{}.{}".format(version.major, version.minor)


multiversion_service = MultiversionService(
    mongo_version=MongoVersion.from_yaml_file(_config.MONGO_VERSION_FILE),
    mongo_releases=MongoReleases.from_yaml_file(_config.RELEASES_FILE),
)

version_constants = multiversion_service.calculate_version_constants()

LAST_LTS_BIN_VERSION = version_constants.get_last_lts_fcv()
LAST_CONTINUOUS_BIN_VERSION = version_constants.get_last_continuous_fcv()

LAST_LTS_FCV = version_constants.get_last_lts_fcv()
LAST_CONTINUOUS_FCV = version_constants.get_last_continuous_fcv()
LATEST_FCV = version_constants.get_latest_fcv()

LAST_CONTINUOUS_MONGO_BINARY = version_constants.build_last_continuous_binary("mongo")
LAST_CONTINUOUS_MONGOD_BINARY = version_constants.build_last_continuous_binary("mongod")
LAST_CONTINUOUS_MONGOS_BINARY = version_constants.build_last_continuous_binary("mongos")

LAST_LTS_MONGO_BINARY = version_constants.build_last_lts_binary("mongo")
LAST_LTS_MONGOD_BINARY = version_constants.build_last_lts_binary("mongod")
LAST_LTS_MONGOS_BINARY = version_constants.build_last_lts_binary("mongos")

REQUIRES_FCV_TAG_LATEST = version_constants.get_latest_tag()

# Generate tags for all FCVS in (lastLTS, latest].
# All multiversion tests should be run with these tags excluded.
REQUIRES_FCV_TAG = version_constants.get_fcv_tag_list()

REQUIRES_FCV_TAGS_LESS_THAN_LATEST = version_constants.get_fcv_tags_less_than_latest()

# Generate evergreen project names for all FCVs less than latest.
EVERGREEN_PROJECTS = ["mongodb-mongo-master"]
EVERGREEN_PROJECTS.extend([evg_project_str(fcv) for fcv in version_constants.fcvs_less_than_latest])

OLD_VERSIONS = (
    [LAST_LTS]
    if LAST_CONTINUOUS_FCV == LAST_LTS_FCV or LAST_CONTINUOUS_FCV in version_constants.get_eols()
    else [LAST_LTS, LAST_CONTINUOUS]
)


def log_constants(exec_log):
    """Log FCV constants."""
    exec_log.info("Last LTS FCV: {}".format(LAST_LTS_FCV))
    exec_log.info("Last Continuous FCV: {}".format(LAST_CONTINUOUS_FCV))
    exec_log.info("Latest FCV: {}".format(LATEST_FCV))
    exec_log.info("Requires FCV Tag Latest: {}".format(REQUIRES_FCV_TAG_LATEST))
    exec_log.info("Requires FCV Tag: {}".format(REQUIRES_FCV_TAG))