#!/usr/bin/env python3
"""qBittorrent Manager."""

import argparse
import glob
import math
import multiprocessing
import os
import platform
import sys
import time
from datetime import datetime
from datetime import timedelta
from functools import lru_cache
from multiprocessing import Manager

from modules.util import execute_qbit_commands
from modules.util import format_stats_summary
from modules.util import get_matching_config_files

try:
    import schedule
    from croniter import croniter
    from humanize import precisedelta

    from modules.logs import MyLogger
except ModuleNotFoundError:
    print("Requirements Error: Requirements are not installed")
    sys.exit(1)

REQUIRED_VERSION = (3, 8, 1)
REQUIRED_VERSION_STR = ".".join(str(x) for x in REQUIRED_VERSION)
current_version = sys.version_info

if current_version < (REQUIRED_VERSION):
    print(
        f"Version Error: Version: {current_version[0]}.{current_version[1]}.{current_version[2]} incompatible with "
        f"qbit_manage please use Python {REQUIRED_VERSION_STR}+"
    )
    sys.exit(1)

parser = argparse.ArgumentParser("qBittorrent Manager.", description="A mix of scripts combined for managing qBittorrent.")
parser.add_argument(
    "-ws",
    "--web-server",
    dest="web_server",
    action="store_true",
    default=False,
    help="Start a web server to handle command requests via HTTP API.",
)
parser.add_argument(
    "-p",
    "--port",
    dest="port",
    type=int,
    default=8080,
    help="Port number for the web server (default: 8080).",
)
parser.add_argument("-db", "--debug", dest="debug", help=argparse.SUPPRESS, action="store_true", default=False)
parser.add_argument("-tr", "--trace", dest="trace", help=argparse.SUPPRESS, action="store_true", default=False)
parser.add_argument(
    "-r",
    "--run",
    dest="run",
    action="store_true",
    default=False,
    help="Run without the scheduler. Script will exit after completion.",
)
parser.add_argument(
    "-sch",
    "--schedule",
    dest="schedule",
    default="1440",
    type=str,
    help=(
        "Schedule to run every x minutes. (Default set to 1440 (1 day))."
        "Can also customize schedule via cron syntax (See https://crontab.guru/examples.html)"
    ),
)
parser.add_argument(
    "-sd",
    "--startup-delay",
    dest="startupDelay",
    default="0",
    type=str,
    help="Set delay in seconds on the first run of a schedule (Default set to 0)",
)
parser.add_argument(
    "-c",
    "--config-file",
    dest="configfiles",
    action="store",
    default="config.yml",
    type=str,
    help=(
        "This is used if you want to use a different name for your config.yml or if you want to load multiple"
        "config files using *. Example: tv.yml or config*.yml"
    ),
)
parser.add_argument(
    "-lf",
    "--log-file",
    dest="logfile",
    action="store",
    default="qbit_manage.log",
    type=str,
    help="This is used if you want to use a different name for your log file. Example: tv.log",
)
parser.add_argument(
    "-re",
    "--recheck",
    dest="recheck",
    action="store_true",
    default=False,
    help="Recheck paused torrents sorted by lowest size. Resume if Completed.",
)
parser.add_argument(
    "-cu",
    "--cat-update",
    dest="cat_update",
    action="store_true",
    default=False,
    help="Use this if you would like to update your categories.",
)
parser.add_argument(
    "-tu",
    "--tag-update",
    dest="tag_update",
    action="store_true",
    default=False,
    help=(
        "Use this if you would like to update your tags and/or set seed goals/limit upload speed by tag."
        " (Only adds tags to untagged torrents)"
    ),
)
parser.add_argument(
    "-ru",
    "--rem-unregistered",
    dest="rem_unregistered",
    action="store_true",
    default=False,
    help="Use this if you would like to remove unregistered torrents.",
)
parser.add_argument(
    "-tte",
    "--tag-tracker-error",
    dest="tag_tracker_error",
    action="store_true",
    default=False,
    help="Use this if you would like to tag torrents that do not have a working tracker.",
)
parser.add_argument(
    "-ro",
    "--rem-orphaned",
    dest="rem_orphaned",
    action="store_true",
    default=False,
    help="Use this if you would like to remove orphaned files.",
)
parser.add_argument(
    "-tnhl",
    "--tag-nohardlinks",
    dest="tag_nohardlinks",
    action="store_true",
    default=False,
    help=(
        "Use this to tag any torrents that do not have any hard links associated with any of the files. "
        "This is useful for those that use Sonarr/Radarr which hard link your media files with the torrents for seeding. "
        "When files get upgraded they no longer become linked with your media therefore will be tagged with a new tag noHL. "
        "You can then safely delete/remove these torrents to free up any extra space that is not being used by your media folder."
    ),
)
parser.add_argument(
    "-sl",
    "--share-limits",
    dest="share_limits",
    action="store_true",
    default=False,
    help=(
        "Use this to help apply and manage your torrent share limits based on your tags/categories."
        "This can apply a max ratio, seed time limits to your torrents or limit your torrent upload speed as well."
        "Share limits are applied in the order of priority specified."
    ),
)
parser.add_argument(
    "-sc",
    "--skip-cleanup",
    dest="skip_cleanup",
    action="store_true",
    default=False,
    help="Use this to skip cleaning up Recycle Bin/Orphaned directory.",
)
parser.add_argument(
    "-svc",
    "--skip-qb-version-check",
    dest="skip_qb_version_check",
    action="store_true",
    default=False,
    # help="Bypass qBittorrent/libtorrent version compatibility check. "
    # "You run the risk of undesirable behavior and will receive no support.",
    help=argparse.SUPPRESS,
)
parser.add_argument(
    "-dr",
    "--dry-run",
    dest="dry_run",
    action="store_true",
    default=False,
    help="If you would like to see what is gonna happen but not actually move/delete or tag/categorize anything.",
)
parser.add_argument(
    "-ll", "--log-level", dest="log_level", action="store", default="INFO", type=str, help="Change your log level."
)
parser.add_argument(
    "-d", "--divider", dest="divider", help="Character that divides the sections (Default: '=')", default="=", type=str
)
parser.add_argument("-w", "--width", dest="width", help="Screen Width (Default: 100)", default=100, type=int)
parser.add_argument(
    "-ls", "--log-size", dest="log_size", action="store", default=10, type=int, help="Maximum log size per file (in MB)"
)
parser.add_argument(
    "-lc", "--log-count", dest="log_count", action="store", default=5, type=int, help="Maximum mumber of logs to keep"
)
args = parser.parse_args()


static_envs = []
test_value = None


def get_arg(env_str, default, arg_bool=False, arg_int=False):
    global test_value
    env_vars = [env_str] if not isinstance(env_str, list) else env_str
    final_value = None
    static_envs.extend(env_vars)
    for env_var in env_vars:
        env_value = os.environ.get(env_var)
        if env_var == "BRANCH_NAME":
            test_value = env_value
        if env_value is not None:
            final_value = env_value
            break
    if final_value or (arg_int and final_value == 0):
        if arg_bool:
            if final_value is True or final_value is False:
                return final_value
            elif final_value.lower() in ["t", "true"]:
                return True
            else:
                return False
        elif arg_int:
            try:
                return int(final_value)
            except ValueError:
                return default
        else:
            return str(final_value)
    else:
        return default


@lru_cache(maxsize=1)
def is_valid_cron_syntax(cron_expression):
    try:
        croniter(str(cron_expression))
        return True
    except (ValueError, KeyError):
        return False


try:
    from git import InvalidGitRepositoryError
    from git import Repo

    try:
        git_branch = Repo(path=".").head.ref.name  # noqa
    except InvalidGitRepositoryError:
        git_branch = None
except ImportError:
    git_branch = None

env_version = get_arg("BRANCH_NAME", "master")
is_docker = get_arg("QBM_DOCKER", False, arg_bool=True)
web_server = get_arg("QBT_WEB_SERVER", args.web_server, arg_bool=True)
port = get_arg("QBT_PORT", args.port, arg_int=True)
run = get_arg("QBT_RUN", args.run, arg_bool=True)
sch = get_arg("QBT_SCHEDULE", args.schedule)
startupDelay = get_arg("QBT_STARTUP_DELAY", args.startupDelay)
config_files = get_arg("QBT_CONFIG", args.configfiles)
log_file = get_arg("QBT_LOGFILE", args.logfile)
recheck = get_arg("QBT_RECHECK", args.recheck, arg_bool=True)
cat_update = get_arg("QBT_CAT_UPDATE", args.cat_update, arg_bool=True)
tag_update = get_arg("QBT_TAG_UPDATE", args.tag_update, arg_bool=True)
rem_unregistered = get_arg("QBT_REM_UNREGISTERED", args.rem_unregistered, arg_bool=True)
tag_tracker_error = get_arg("QBT_TAG_TRACKER_ERROR", args.tag_tracker_error, arg_bool=True)
rem_orphaned = get_arg("QBT_REM_ORPHANED", args.rem_orphaned, arg_bool=True)
tag_nohardlinks = get_arg("QBT_TAG_NOHARDLINKS", args.tag_nohardlinks, arg_bool=True)
share_limits = get_arg("QBT_SHARE_LIMITS", args.share_limits, arg_bool=True)
skip_cleanup = get_arg("QBT_SKIP_CLEANUP", args.skip_cleanup, arg_bool=True)
skip_qb_version_check = get_arg("QBT_SKIP_QB_VERSION_CHECK", args.skip_qb_version_check, arg_bool=True)
dry_run = get_arg("QBT_DRY_RUN", args.dry_run, arg_bool=True)
log_level = get_arg("QBT_LOG_LEVEL", args.log_level)
log_size = get_arg("QBT_LOG_SIZE", args.log_size, arg_int=True)
log_count = get_arg("QBT_LOG_COUNT", args.log_count, arg_int=True)
divider = get_arg("QBT_DIVIDER", args.divider)
screen_width = get_arg("QBT_WIDTH", args.width, arg_int=True)
debug = get_arg("QBT_DEBUG", args.debug, arg_bool=True)
trace = get_arg("QBT_TRACE", args.trace, arg_bool=True)

if debug:
    log_level = "DEBUG"
if trace:
    log_level = "TRACE"

stats = {}
args = {}

if os.path.isdir("/config") and glob.glob(os.path.join("/config", config_files)):
    default_dir = "/config"
else:
    default_dir = os.path.join(os.path.dirname(os.path.abspath(__file__)), "config")

config_files = get_matching_config_files(config_files, default_dir)


for v in [
    "run",
    "sch",
    "startupDelay",
    "config_files",
    "log_file",
    "recheck",
    "cat_update",
    "tag_update",
    "rem_unregistered",
    "tag_tracker_error",
    "rem_orphaned",
    "tag_nohardlinks",
    "share_limits",
    "skip_cleanup",
    "skip_qb_version_check",
    "dry_run",
    "log_level",
    "log_size",
    "log_count",
    "divider",
    "screen_width",
    "debug",
    "trace",
]:
    args[v] = eval(v)

if screen_width < 90 or screen_width > 300:
    print(f"Argument Error: width argument invalid: {screen_width} must be an integer between 90 and 300 using the default 100")
    screen_width = 100

# Check if Schedule parameter is a number
try:
    sch = int(sch)
except ValueError:
    if not is_valid_cron_syntax(sch):
        print(f"Invalid Schedule: Please use a valid cron schedule or integer (minutes). Current value is set to '{sch}'")
        sys.exit(1)

# Check if StartupDelay parameter is a number
try:
    startupDelay = int(startupDelay)
except ValueError:
    print(f"startupDelay Error: startupDelay is not a number. Current value is set to '{startupDelay}'")
    sys.exit(1)


logger = MyLogger("qBit Manage", log_file, log_level, default_dir, screen_width, divider[0], False, log_size, log_count)
from modules import util  # noqa

util.logger = logger
from modules.config import Config  # noqa
from modules.core.category import Category  # noqa
from modules.core.recheck import ReCheck  # noqa
from modules.core.remove_orphaned import RemoveOrphaned  # noqa
from modules.core.remove_unregistered import RemoveUnregistered  # noqa
from modules.core.share_limits import ShareLimits  # noqa
from modules.core.tag_nohardlinks import TagNoHardLinks  # noqa
from modules.core.tags import Tags  # noqa
from modules.util import Failed  # noqa
from modules.util import GracefulKiller  # noqa
from modules.web_api import CommandRequest  # noqa


def my_except_hook(exctype, value, tbi):
    """Handle uncaught exceptions"""
    if issubclass(exctype, KeyboardInterrupt):
        sys.__excepthook__(exctype, value, tbi)
    else:
        logger.critical("Uncaught Exception", exc_info=(exctype, value, tbi))


sys.excepthook = my_except_hook

version = ("Unknown", "Unknown", 0)
with open(os.path.join(os.path.dirname(os.path.abspath(__file__)), "VERSION")) as handle:
    for line in handle.readlines():
        line = line.strip()
        if len(line) > 0:
            version = util.parse_version(line)
            break
branch = util.guess_branch(version, env_version, git_branch)
if branch is None:
    branch = "Unknown"
version = (version[0].replace("develop", branch), version[1].replace("develop", branch), version[2])


def start_loop(first_run=False):
    """Start the main loop"""
    if len(config_files) == 1:
        args["config_file"] = config_files[0]
        if not first_run:
            print_logo(logger)
        start()
    else:
        for config_file in config_files:
            args["config_file"] = config_file
            config_base = os.path.splitext(os.path.basename(config_file))[0]
            logger.add_config_handler(config_base)
            if not first_run:
                print_logo(logger)
            start()
            logger.remove_config_handler(config_base)


def start():
    """Start the run"""
    global is_running, is_running_lock, web_api_queue, next_scheduled_run_info_shared
    # Acquire lock only briefly to set the flag, then release immediately
    with is_running_lock:
        is_running.value = True  # Set flag to indicate a run is in progress
    start_time = datetime.now()
    args["time"] = start_time.strftime("%H:%M")
    args["time_obj"] = start_time
    stats_summary = []
    logger.separator("Starting Run")
    cfg = None
    body = ""
    run_time = ""
    end_time = None
    global stats
    stats = {
        "added": 0,
        "deleted": 0,
        "deleted_contents": 0,
        "resumed": 0,
        "rechecked": 0,
        "orphaned": 0,
        "recycle_emptied": 0,
        "orphaned_emptied": 0,
        "tagged": 0,
        "categorized": 0,
        "rem_unreg": 0,
        "tagged_tracker_error": 0,
        "untagged_tracker_error": 0,
        "tagged_noHL": 0,
        "untagged_noHL": 0,
        "updated_share_limits": 0,
        "cleaned_share_limits": 0,
    }

    def finished_run(next_scheduled_run_info_shared):
        """Handle the end of a run"""
        nonlocal end_time, start_time, stats_summary, run_time, body
        end_time = datetime.now()
        run_time = str(end_time - start_time).split(".", maxsplit=1)[0]
        if run is False:
            # Simple check to guess if it's a cron syntax
            if is_valid_cron_syntax(sch):
                next_run_time = schedule_from_cron(sch)
            else:
                delta = timedelta(minutes=sch)
                logger.info(f"    Scheduled Mode: Running every {precisedelta(delta)}.")
                next_run_time = schedule_every_x_minutes(sch)
        else:
            next_run_time = datetime.now()
        nxt_run = calc_next_run(next_run_time)
        next_scheduled_run_info_shared.update(nxt_run)
        summary = os.linesep.join(stats_summary) if stats_summary else ""
        next_run_str = next_scheduled_run_info_shared.get("next_run_str", "")
        msg = (
            (f"Finished Run\n{summary}\nRun Time: {run_time}\n{next_run_str if next_run_str else ''}")
            .replace("\n\n", "\n")
            .rstrip()
        )
        body = logger.separator(msg)[0]
        return body

    try:
        cfg = Config(default_dir, args)
        qbit_manager = cfg.qbt
    except Exception as ex:
        logger.stacktrace()
        logger.print_line(ex, "CRITICAL")
        logger.print_line("Exiting scheduled Run.", "CRITICAL")
        finished_run(next_scheduled_run_info_shared)
        return None

    if qbit_manager:
        # Execute qBittorrent commands using shared function
        execute_qbit_commands(qbit_manager, cfg.commands, stats, hashes=None)

        # Empty RecycleBin
        stats["recycle_emptied"] += cfg.cleanup_dirs("Recycle Bin")

        # Empty Orphaned Directory
        stats["orphaned_emptied"] += cfg.cleanup_dirs("Orphaned Data")

    stats_summary = format_stats_summary(stats, cfg)

    finished_run(next_scheduled_run_info_shared)
    if cfg:
        try:
            next_run = next_scheduled_run_info_shared.get("next_run")
            cfg.webhooks_factory.end_time_hooks(start_time, end_time, run_time, next_run, stats, body)
            # Release flag after all cleanup is complete
            with is_running_lock:
                is_running.value = False
        except Failed as err:
            logger.stacktrace()
            logger.error(f"Webhooks Error: {err}")
            # Release flag even if webhooks fail
            with is_running_lock:
                is_running.value = False
            logger.info("Released lock for web API requests despite webhook error")


def end():
    """Ends the program"""
    logger.info("Exiting Qbit_manage")
    logger.remove_main_handler()
    sys.exit(0)


def calc_next_run(next_run_time):
    """Calculates the next run time based on the schedule"""
    current_time = datetime.now()
    current = current_time.strftime("%I:%M %p")
    time_to_run_str = next_run_time.strftime("%Y-%m-%d %I:%M %p")
    delta_seconds = (next_run_time - current_time).total_seconds()
    time_until = precisedelta(timedelta(minutes=math.ceil(delta_seconds / 60)), minimum_unit="minutes", format="%d")
    next_run = {}
    if run is False:
        next_run["next_run"] = next_run_time
        next_run["next_run_str"] = f"Current Time: {current} | {time_until} until the next run at {time_to_run_str}"
    else:
        next_run["next_run"] = None
        next_run["next_run_str"] = ""
    return next_run


def schedule_from_cron(cron_expression):
    schedule.clear()
    base_time = datetime.now()
    try:
        iter = croniter(cron_expression, base_time)
        next_run_time = iter.get_next(datetime)
    except Exception as e:
        logger.error(f"Invalid Cron Syntax: {cron_expression}. {e}")
        logger.stacktrace()
        sys.exit(1)
    delay = (next_run_time - base_time).total_seconds()
    schedule.every(delay).seconds.do(start_loop)
    return next_run_time


def schedule_every_x_minutes(min):
    schedule.clear()
    schedule.every(min).minutes.do(start_loop)
    next_run_time = datetime.now() + timedelta(minutes=min)
    return next_run_time


def print_logo(logger):
    global is_docker, version, git_branch
    logger.separator()
    logger.info_center("        _     _ _                                            ")  # noqa: W605
    logger.info_center("       | |   (_) |                                           ")  # noqa: W605
    logger.info_center("   __ _| |__  _| |_   _ __ ___   __ _ _ __   __ _  __ _  ___ ")  # noqa: W605
    logger.info_center("  / _` | '_ \\| | __| | '_ ` _ \\ / _` | '_ \\ / _` |/ _` |/ _ \\")  # noqa: W605
    logger.info_center(" | (_| | |_) | | |_  | | | | | | (_| | | | | (_| | (_| |  __/")  # noqa: W605
    logger.info_center(r"  \__, |_.__/|_|\__| |_| |_| |_|\__,_|_| |_|\__,_|\__, |\___|")  # noqa: W605
    logger.info_center("     | |         ______                            __/ |     ")  # noqa: W605
    logger.info_center("     |_|        |______|                          |___/      ")  # noqa: W605
    system_ver = "Docker" if is_docker else f"Python {platform.python_version()}"
    logger.info(f"    Version: {version[0]} ({system_ver}){f' (Git: {git_branch})' if git_branch else ''}")
    latest_version = util.current_version(version, branch=branch)
    new_version = (
        latest_version[0]
        if latest_version and (version[1] != latest_version[1] or (version[2] and version[2] < latest_version[2]))
        else None
    )
    if new_version:
        logger.info(f"    Newest Version: {new_version}")
    logger.info(f"    Platform: {platform.platform()}")


if __name__ == "__main__":
    killer = GracefulKiller()
    logger.add_main_handler()
    print_logo(logger)
    try:

        def run_web_server(port, process_args, is_running, is_running_lock, web_api_queue, next_scheduled_run_info_shared):
            """Run web server in a separate process with shared args"""
            try:
                import uvicorn

                from modules.web_api import create_app

                # Create FastAPI app instance with process args and shared state
                app = create_app(process_args, is_running, is_running_lock, web_api_queue, next_scheduled_run_info_shared)

                # Configure uvicorn settings
                config = uvicorn.Config(app, host="0.0.0.0", port=port, log_level="info", access_log=True)

                # Run the server
                server = uvicorn.Server(config)
                server.run()
            except ImportError:
                logger.critical("Web server dependencies not installed. Please install with: pip install qbit_manage[web]")
                sys.exit(1)
            except KeyboardInterrupt:
                pass

        manager = Manager()
        is_running = manager.Value("b", False)  # 'b' for boolean, initialized to False
        is_running_lock = manager.Lock()  # Separate lock for is_running synchronization
        web_api_queue = manager.Queue()
        next_scheduled_run_info_shared = manager.dict()

        # Start web server if enabled and not in run mode
        web_process = None
        if web_server and not run:
            logger.separator("Starting Web Server")
            logger.info(f"Web API server running on http://0.0.0.0:{port}")

            # Create a copy of args to pass to the web server process
            process_args = args.copy()

            web_process = multiprocessing.Process(
                target=run_web_server,
                args=(port, process_args, is_running, is_running_lock, web_api_queue, next_scheduled_run_info_shared),
            )
            web_process.start()
            logger.info("Web server started in separate process")

        # Handle normal run modes
        if run:
            run_mode_message = "    Run Mode: Script will exit after completion."
            logger.info(run_mode_message)
            start_loop(True)
        else:
            # Simple check to guess if it's a cron syntax
            if is_valid_cron_syntax(sch):
                run_mode_message = f"    Scheduled Mode: Running cron '{sch}'"
                next_run_time = schedule_from_cron(sch)
                next_run_info = calc_next_run(next_run_time)
                next_scheduled_run_info_shared.update(next_run_info)  # Update shared dictionary
                run_mode_message += f"\n     {next_run_info['next_run_str']}"
                logger.info(run_mode_message)
            else:
                delta = timedelta(minutes=sch)
                run_mode_message = f"    Scheduled Mode: Running every {precisedelta(delta)}."
                next_run_time = schedule_every_x_minutes(sch)
                next_run_info = calc_next_run(next_run_time)
                next_scheduled_run_info_shared.update(next_run_info)  # Update shared dictionary
                if startupDelay:
                    run_mode_message += f"\n    Startup Delay: Initial Run will start after {startupDelay} seconds"
                    logger.info(run_mode_message)
                    time.sleep(startupDelay)
                else:
                    logger.info(run_mode_message)
                start_loop(True)

            # Update next_scheduled_run_info_shared in the main loop
            while not killer.kill_now:
                next_run_time = schedule.next_run()  # Call the function to get the datetime object
                next_run_info = calc_next_run(next_run_time)
                next_scheduled_run_info_shared.update(next_run_info)  # Update shared dictionary

                if web_server:
                    if is_running.value:
                        logger.info("Scheduled run skipped: Web API is currently processing a request.")
                    else:
                        schedule.run_pending()
                else:
                    schedule.run_pending()

                logger.trace(f"    Pending Jobs: {schedule.get_jobs()}")
                time.sleep(60)
            if web_process:
                web_process.terminate()
                web_process.join()
            end()
    except KeyboardInterrupt:
        if web_process:
            web_process.terminate()
            web_process.join()
        end()