import asyncio
import json
import pathlib
import re
from http import HTTPStatus
from zoneinfo import ZoneInfo

import vininfo.exceptions
from sanic import response, Blueprint, __version__ as sanic_version
from sanic.request import Request
from sanic_ext import validate
from sanic_ext.extensions.openapi import openapi
from vininfo import Vin
from vininfo.details._base import VinDetails

from modules.archive.api import archive_bp
from modules.docs.api import docs_bp
from modules.flasher.api import flasher_bp
from modules.inventory import inventory_bp
from modules.map.api import map_bp
from modules.videos.api import videos_bp
from modules.zim.api import zim_bp
from wrolpi import flags, schema, dates
from wrolpi import tags
from wrolpi.api_utils import json_response, api_app
from wrolpi.collections.api import collection_bp
from wrolpi.common import logger, get_wrolpi_config, wrol_mode_enabled, get_media_directory, \
    wrol_mode_check, native_only, disable_wrol_mode, enable_wrol_mode, get_global_statistics, url_strip_host, \
    set_global_log_level, get_relative_to_media_directory, search_other_estimates, set_system_timezone
from wrolpi.config_api import config_bp
from wrolpi.dates import now
from wrolpi.downloader import download_manager
from wrolpi.errors import WROLModeEnabled, InvalidConfig, ValidationError
from wrolpi.events import get_events, Events
from wrolpi.files import files_bp
from wrolpi.files.lib import get_file_statistics, search_file_suggestion_count
from wrolpi.log_levels import int_to_name
from wrolpi.tags import Tag
from wrolpi.vars import DOCKERIZED, IS_RPI, IS_RPI4, IS_RPI5, API_HOST, API_PORT, API_WORKERS, API_DEBUG, \
    API_ACCESS_LOG, truthy_arg, API_AUTO_RELOAD
from wrolpi.version import __version__

logger = logger.getChild(__name__)

api_app.config.FALLBACK_ERROR_FORMAT = 'json'

api_bp = Blueprint('RootAPI', url_prefix='/api')

# Blueprints order here defines what order they are displayed in OpenAPI Docs.
api_app.blueprint(api_bp)
api_app.blueprint(archive_bp)
api_app.blueprint(collection_bp)  # Unified collection endpoints
api_app.blueprint(config_bp)
api_app.blueprint(docs_bp)
api_app.blueprint(files_bp)
api_app.blueprint(flasher_bp)
api_app.blueprint(inventory_bp)
api_app.blueprint(map_bp)
api_app.blueprint(videos_bp)
api_app.blueprint(zim_bp)


def run_webserver(
        host: str = API_HOST,
        port: int = API_PORT,
        workers: int = API_WORKERS,
        api_debug: bool = API_DEBUG,
        access_log: bool = API_ACCESS_LOG,
):
    # Attach all blueprints after they have been defined.

    kwargs = dict(
        host=host,
        port=port,
        workers=workers,
        debug=api_debug,
        access_log=access_log,
        auto_reload=DOCKERIZED,
    )
    logger.warning(f'Running Sanic {sanic_version} with kwargs {kwargs}')
    return api_app.run(**kwargs)


def init_parser(parser):
    # Called by WROLPI's main() function
    parser.add_argument('-H', '--host', default=API_HOST, help='What network interface to connect webserver')
    parser.add_argument('-p', '--port', default=API_PORT, type=int, help='What port to connect webserver')
    parser.add_argument('-w', '--workers', default=API_WORKERS, type=int, help='How many web workers to run')
    parser.add_argument('--access-log', default=API_ACCESS_LOG, type=truthy_arg, help='Enable Sanic access log')
    parser.add_argument('--api-debug', default=API_DEBUG, type=truthy_arg, help='Enable Sanic debug log')
    parser.add_argument('--api-auto-reload', default=API_AUTO_RELOAD, type=truthy_arg, help='Enable Sanic auto reload')


def main(args):
    return run_webserver(
        host=args.host,
        port=args.port,
        workers=args.workers,
        api_debug=args.api_debug,
        access_log=args.access_log,
    )


index_html = '''
<html>
<body>
<p>
    This is a WROLPi API.
    <ul>
        <li>You can test it at this endpoint <a href="/api/echo">/api/echo</a></li>
        <li>You can view the docs at <a href="/docs">/docs</a></li>
    </ul>
</p>
</body>
</html>
'''


@api_app.get('/')
@api_bp.get('/')
async def index(_):
    return response.html(index_html)


@api_bp.route('/echo', methods=['GET', 'POST', 'PUT', 'DELETE', 'PATCH', 'OPTIONS'])
@openapi.definition(
    description='Echo whatever is sent to this.',
    response=schema.EchoResponse,
)
async def echo(request: Request):
    try:
        request_json = request.json
    except Exception as e:
        logger.error('Failed to parse request JSON', exc_info=e)
        request_json = None
    request_headers = dict(request.headers)
    ret = dict(
        form=request.form,
        headers=request_headers,
        json=request_json,
        method=request.method,
        args=request.args,
    )
    return response.json(ret)


@api_bp.route('/settings', methods=['GET', 'OPTIONS'])
@openapi.definition(
    description='Get WROLPi settings',
    response=schema.SettingsResponse,
)
def get_settings(_: Request):
    wrolpi_config = get_wrolpi_config()

    # Drop special directories (e.g. zims) that must never be ignored, if present from older configs.
    from wrolpi.files.lib import sanitize_ignored_directories
    sanitize_ignored_directories()

    ignored_directories = [get_relative_to_media_directory(i) for i in wrolpi_config.ignored_directories]

    settings = {
        'archive_destination': wrolpi_config.archive_destination,
        'download_manager_disabled': download_manager.is_disabled,
        'download_manager_stopped': download_manager.is_stopped,
        'download_daily_limit_global': wrolpi_config.download_daily_limit_global,
        'download_daily_limit_per_domain': wrolpi_config.download_daily_limit_per_domain,
        'download_on_startup': wrolpi_config.download_on_startup,
        'download_timeout': wrolpi_config.download_timeout,
        'download_wait': wrolpi_config.download_wait,
        'download_window_start': wrolpi_config.download_window_start,
        'download_window_end': wrolpi_config.download_window_end,
        'hotspot_device': wrolpi_config.hotspot_device,
        'hotspot_on_startup': wrolpi_config.hotspot_on_startup,
        'hotspot_password': wrolpi_config.hotspot_password,
        'hotspot_ssid': wrolpi_config.hotspot_ssid,
        # Hotspot/throttle status now from Controller (/controller/api/hotspot/status, /controller/api/throttle/status)
        'check_for_upgrades': wrolpi_config.check_for_upgrades,
        'ignore_outdated_zims': wrolpi_config.ignore_outdated_zims,
        'ignored_directories': ignored_directories,
        'log_level': api_app.shared_ctx.log_level.value,
        'map_default_location': wrolpi_config.map_default_location,
        'map_destination': wrolpi_config.map_destination,
        'nav_color': wrolpi_config.nav_color,
        'media_directory': str(get_media_directory()),  # Convert to string to avoid conversion to relative.
        'playlists_destination': wrolpi_config.playlists_destination,
        'tags_directory': wrolpi_config.tags_directory,
        'throttle_on_startup': wrolpi_config.throttle_on_startup,
        'version': __version__,
        'videos_destination': wrolpi_config.videos_destination,
        'wrol_mode': wrolpi_config.wrol_mode,
        'zims_destination': wrolpi_config.zims_destination,
        'require_cookies_unlocked': wrolpi_config.require_cookies_unlocked,
        'require_media_mounted': wrolpi_config.require_media_mounted,
        'save_ffprobe_json': wrolpi_config.save_ffprobe_json,
        'timezone': wrolpi_config.timezone,
    }
    return json_response(settings)


@api_bp.patch('/settings')
@openapi.definition(
    description='Update WROLPi settings',
    body=schema.SettingsRequest,
    validate=True,
)
async def update_settings(_: Request, body: schema.SettingsRequest):
    if wrol_mode_enabled() and body.wrol_mode is None:
        # Cannot update settings while WROL Mode is enabled, unless you want to disable WROL Mode.
        raise WROLModeEnabled()

    if body.wrol_mode is False:
        # Disable WROL Mode
        await disable_wrol_mode()
        return response.empty()
    elif body.wrol_mode is True:
        # Enable WROL Mode
        enable_wrol_mode()
        return response.empty()

    if body.hotspot_password and len(body.hotspot_password) < 8:
        raise InvalidConfig('Hotspot password must be at least 8 characters')

    # Remove any keys with None values, then save the config.
    new_config = {k: v for k, v in body.__dict__.items() if v is not None}
    wrolpi_config = get_wrolpi_config()
    old_zims_destination = wrolpi_config.zims_destination

    if not new_config:
        raise InvalidConfig()

    if body.archive_destination and pathlib.Path(body.archive_destination).is_absolute():
        raise InvalidConfig('Archive directory must be relative to media directory')
    elif not body.archive_destination:
        new_config['archive_destination'] = wrolpi_config.default_config['archive_destination']

    if body.videos_destination and pathlib.Path(body.videos_destination).is_absolute():
        raise InvalidConfig('Videos directory must be relative to media directory')
    elif not body.videos_destination:
        new_config['videos_destination'] = wrolpi_config.default_config['videos_destination']

    if body.map_destination and pathlib.Path(body.map_destination).is_absolute():
        raise InvalidConfig('Map directory must be relative to media directory')
    elif not body.map_destination:
        new_config['map_destination'] = wrolpi_config.default_config['map_destination']

    if body.zims_destination and pathlib.Path(body.zims_destination).is_absolute():
        raise InvalidConfig('Zims directory must be relative to media directory')
    elif body.zims_destination and '..' in pathlib.Path(body.zims_destination).parts:
        # Kiwix serves and rebuilds library.xml in this directory; traversal must not escape media.
        raise InvalidConfig('Zims directory must not contain ".."')
    elif not body.zims_destination:
        new_config['zims_destination'] = wrolpi_config.default_config['zims_destination']

    if body.playlists_destination:
        # The playlists sync deletes files in its directory, so this destination gets stricter
        # validation: no traversal, and no overlap with the other content destinations.  Compare
        # against the destinations in this same request when provided.
        from types import SimpleNamespace
        from wrolpi.collections.sync import validate_playlists_destination
        effective = SimpleNamespace(
            videos_destination=body.videos_destination or wrolpi_config.videos_destination,
            archive_destination=body.archive_destination or wrolpi_config.archive_destination,
            map_destination=body.map_destination or wrolpi_config.map_destination,
            zims_destination=body.zims_destination or wrolpi_config.zims_destination,
        )
        if error := validate_playlists_destination(body.playlists_destination, effective):
            raise InvalidConfig(error)
    else:
        new_config['playlists_destination'] = wrolpi_config.default_config['playlists_destination']

    # Validate timezone if provided; empty string clears it.
    if body.timezone is not None:
        if body.timezone == '':
            new_config['timezone'] = None
        else:
            try:
                ZoneInfo(body.timezone)
            except (KeyError, Exception):
                raise InvalidConfig(f'Invalid timezone: {body.timezone}')

    # Daily download limits must be non-negative integers.  0 (or null) means unlimited.
    for field_name in ('download_daily_limit_global', 'download_daily_limit_per_domain'):
        value = getattr(body, field_name, None)
        if value is not None and value < 0:
            raise InvalidConfig(f'{field_name} must be a non-negative integer')

    # Handle download window fields: empty string clears the value.
    for field_name in ('download_window_start', 'download_window_end'):
        value = getattr(body, field_name, None)
        if value is not None:
            if value == '':
                new_config[field_name] = None
            else:
                if not re.match(r'^\d{2}:\d{2}$', value):
                    raise InvalidConfig(f'{field_name} must be in HH:MM format')
                new_config[field_name] = value

    log_level = new_config.pop('log_level', None)
    if isinstance(log_level, int):
        set_global_log_level(log_level)
        # Persist log level to config
        wrolpi_config.log_level = int_to_name(log_level)

    # Save config settings (hotspot control is now through Controller endpoints)
    wrolpi_config.update(new_config)

    # If the Zim directory changed, restart Kiwix so it serves the new directory
    # without waiting for a reboot.  Local import avoids a circular import
    # (modules depend on wrolpi, not the reverse).
    if wrolpi_config.zims_destination != old_zims_destination:
        # Persist synchronously first: update() only queues an async background_save,
        # and that switch has no ordering guarantee against the restart switch below.
        # start_kiwix_serve.sh reads zims_destination from disk, so the file must be
        # current before Kiwix restarts.  A save failure is non-fatal (background_save
        # still runs); log and continue.
        try:
            wrolpi_config.save()
        except Exception as e:
            logger.warning(f'Could not synchronously save config before restarting Kiwix: {e}')
        from modules.zim.lib import restart_kiwix_handler
        restart_kiwix_handler.activate_switch()

    # Apply timezone to the system via Controller (native deployments only).
    if body.timezone is not None and not DOCKERIZED:
        timezone_value = new_config.get('timezone')
        if timezone_value:
            await set_system_timezone(timezone_value)

    return response.empty()


@api_bp.post('/valid_regex')
@openapi.definition(
    description='Check if the regex is valid.',
    body=schema.RegexRequest,
    response=schema.RegexResponse,
    validate=True,
)
def valid_regex(_: Request, body: schema.RegexRequest):
    try:
        re.compile(body.regex)
        return response.json({'valid': True, 'regex': body.regex})
    except re.error:
        return response.json({'valid': False, 'regex': body.regex}, HTTPStatus.BAD_REQUEST)


@api_bp.post('/download')
@openapi.definition(
    description='Download all the URLs that are provided.',
    body=schema.DownloadRequest,
    validate=True,
)
@wrol_mode_check
async def post_download(request: Request, body: schema.DownloadRequest):
    # Raises an InvalidDownload if the Downloader cannot be found.
    download_manager.find_downloader_by_name(body.downloader)

    session = request.ctx.session
    kwargs = dict(downloader_name=body.downloader,
                  sub_downloader_name=body.sub_downloader, reset_attempts=True,
                  destination=body.destination, tag_names=body.tag_names,
                  settings=body.settings, override_skip=True)
    if body.frequency:
        download_manager.recurring_download(session, body.urls[0], body.frequency, collection_id=body.collection_id,
                                            **kwargs)
    else:
        download_manager.create_downloads(session, body.urls, **kwargs)
    if download_manager.disabled.is_set() or download_manager.stopped.is_set():
        # Downloads are disabled, warn the user.
        Events.send_downloads_disabled('Download created. But, downloads are disabled.')

    return response.empty(status=HTTPStatus.CREATED)


@api_bp.put('/download/<download_id:int>')
@openapi.definition(
    description='Update properties of the Download',
    body=schema.DownloadRequest,
    validate=True,
)
@wrol_mode_check
async def put_download(request: Request, download_id: int, body: schema.DownloadRequest):
    # Raises an InvalidDownload if the Downloader cannot be found.
    download_manager.find_downloader_by_name(body.downloader)

    if len(body.urls) != 1:
        raise ValidationError('Only one URL can be specified when updating a Download')

    session = request.ctx.session
    download_manager.update_download(
        session,
        id_=download_id,
        url=body.urls[0],
        downloader=body.downloader,
        destination=body.destination,
        frequency=body.frequency,
        tag_names=body.tag_names,
        sub_downloader=body.sub_downloader,
        settings=body.settings,
        collection_id=body.collection_id,
    )
    if download_manager.disabled.is_set() or download_manager.stopped.is_set():
        # Downloads are disabled, warn the user.
        Events.send_downloads_disabled('Download created. But, downloads are disabled.')

    return response.empty()


@api_bp.delete('/download/<download_id:int>')
@openapi.description('Delete a download')
@wrol_mode_check
async def delete_download(request: Request, download_id: int):
    session = request.ctx.session
    deleted = download_manager.delete_download(session, download_id)
    return response.empty(HTTPStatus.NO_CONTENT if deleted else HTTPStatus.NOT_FOUND)


@api_bp.post('/download/<download_id:int>/restart')
@openapi.description('Restart a download.')
async def restart_download(request: Request, download_id: int):
    session = request.ctx.session
    download_manager.restart_download(session, download_id)
    return response.empty()


@api_bp.get('/download')
@openapi.description('Get all Downloads so they can be displayed to the User.')
async def get_downloads(_: Request):
    data = download_manager.get_fe_downloads()

    # Convert `destination` to relative.
    for download in data['once_downloads']:
        download['destination'] = get_relative_to_media_directory(download['destination']) \
            if download['destination'] else None
    for download in data['recurring_downloads']:
        download['destination'] = get_relative_to_media_directory(download['destination']) \
            if download['destination'] else None

    return json_response(data)


@api_bp.post('/download/<download_id:int>/kill')
@openapi.description('Kill a download.  It will be stopped if it is pending.')
async def kill_download(_: Request, download_id: int):
    download_manager.kill_download(download_id)
    return response.empty()


@api_bp.post('/download/kill')
@openapi.description('Kill all downloads.  Disable downloading.')
async def kill_downloads(_: Request):
    logger.warning('Disabled downloads')
    download_manager.disable()
    return response.empty()


@api_bp.post('/download/enable')
@openapi.description('Enable and start downloading.')
async def enable_downloads(_: Request):
    await download_manager.enable()
    return response.empty()


@api_bp.post('/download/clear_completed')
@openapi.description('Clear completed downloads')
async def clear_completed(request: Request):
    session = request.ctx.session
    download_manager.delete_completed(session)
    return response.empty()


@api_bp.post('/download/clear_failed')
@openapi.description('Clear failed downloads')
async def clear_failed(request: Request):
    session = request.ctx.session
    download_manager.delete_failed(session)
    return response.empty()


@api_bp.post('/download/retry_once')
@openapi.description('Retry failed once-downloads')
async def retry_once(_: Request):
    download_manager.retry_downloads(reset_attempts=True)
    return response.empty()


@api_bp.post('/download/delete_once')
@openapi.description('Delete all once downloads')
async def delete_once(request: Request):
    session = request.ctx.session
    download_manager.delete_once(session)
    return response.empty()


@api_bp.post('/download/batch/delete')
@openapi.definition(
    description='Delete specific downloads by their IDs',
    body=schema.DownloadBatchRequest,
    validate=True,
)
@wrol_mode_check
async def batch_delete_downloads(request: Request, body: schema.DownloadBatchRequest):
    session = request.ctx.session
    deleted_ids = download_manager.delete_downloads_by_ids(session, body.download_ids)
    return json_response({'deleted_ids': deleted_ids})


@api_bp.post('/download/batch/retry')
@openapi.definition(
    description='Retry specific downloads by their IDs',
    body=schema.DownloadBatchRequest,
    validate=True,
)
@wrol_mode_check
async def batch_retry_downloads(request: Request, body: schema.DownloadBatchRequest):
    session = request.ctx.session
    count = download_manager.retry_downloads_by_ids(session, body.download_ids)
    return json_response({'retried_count': count})


@api_bp.post('/download/batch/clear')
@openapi.definition(
    description='Clear specific completed downloads by their IDs',
    body=schema.DownloadBatchRequest,
    validate=True,
)
@wrol_mode_check
async def batch_clear_downloads(request: Request, body: schema.DownloadBatchRequest):
    session = request.ctx.session
    deleted_ids = download_manager.clear_completed_by_ids(session, body.download_ids)
    return json_response({'deleted_ids': deleted_ids})


@api_bp.get('/downloaders')
@openapi.description('List all Downloaders that can be specified by the user.')
async def get_downloaders(_: Request):
    downloaders = download_manager.list_downloaders()
    disabled = download_manager.disabled.is_set()
    ret = dict(downloaders=downloaders, manager_disabled=disabled)
    return json_response(ret)


@api_bp.get('/status')
@openapi.definition(
    description='Get the status of CPU/load/etc.',
    response=schema.StatusResponse,
)
async def get_status(request: Request):
    downloads = dict()
    if flags.db_up.is_set():
        try:
            downloads = download_manager.get_summary()
        except Exception as e:
            logger.debug('Unable to get download status', exc_info=e)

    sanic_workers = dict()
    if hasattr(request.app, 'multiplexer'):
        # `multiplexer` may be empty while testing.
        sanic_workers = {
            i: {'pid': j['pid'], 'state': j['state']}
            for i, j in request.app.multiplexer.workers.items()
            if i.startswith('Sanic-Server')
        }

    wrolpi_config = get_wrolpi_config()
    if wrolpi_config.timezone:
        tz = ZoneInfo(wrolpi_config.timezone)
        local_time = now().astimezone(tz).isoformat()
    else:
        local_time = now().astimezone().isoformat()

    ret = dict(
        dockerized=DOCKERIZED,
        downloads=downloads,
        flags=flags.get_flags(),
        # Hotspot and throttle status now come from Controller (/controller/api/stats)
        is_rpi4=IS_RPI4,
        is_rpi5=IS_RPI5,
        is_rpi=IS_RPI,
        local_time=local_time,
        sanic_workers=sanic_workers,
        version=__version__,
        wrol_mode=wrol_mode_enabled(),
        # Include all stats from status worker (includes upgrade info and git_branch).
        **api_app.shared_ctx.status,
    )
    return json_response(ret)


@api_bp.get('/statistics')
@openapi.definition(
    description='Get summary statistics of all files',
)
async def get_statistics(_):
    file_statistics = get_file_statistics()
    global_statistics = get_global_statistics()
    return json_response({
        'file_statistics': file_statistics,
        'global_statistics': global_statistics,
    })


@api_bp.get('/events/feed')
@openapi.description('Get all events after the provided date.')
@validate(query=schema.EventsRequest)
async def feed(request: Request, query: schema.EventsRequest):
    # Get the current datetime from the API.  The frontend will use this to request any events that happen after it's
    # previous request.  The API decides what the time is, just in case the RPi's clock is wrong, or no NTP is
    # available.
    start = now()

    after = None if query.after in (None, 'None') else dates.strpdate(query.after)
    events = get_events(after)
    return json_response(dict(events=events, now=start))


@api_bp.get('/tag')
@openapi.definition(
    description='Get a list of all Tags',
)
async def get_tags_request(request: Request):
    tags_ = tags.get_tags()
    tag_names = request.args.getlist('tag_names')
    result = dict(tags=tags_)
    if tag_names:
        limit = request.args.get('limit')
        limit = int(limit) if limit is not None else None
        result['overlapping_tag_names'] = tags.get_overlapping_tags(tag_names, limit=limit)
    return json_response(result)


@api_bp.get('/tag/recent')
@openapi.definition(
    description='Get the most recently used tags',
)
async def get_recent_tags_request(_: Request):
    tag_names = tags.get_recent_tags()
    return json_response(dict(tag_names=tag_names))


@api_bp.post('/tag', name='tag_crate')
@api_bp.post('/tag/<tag_id:int>', name='tag_update')
@openapi.definition(
    description='Create or update a Tag',
    body=schema.TagRequest,
    validate=True,
)
async def post_tag(request: Request, body: schema.TagRequest, tag_id: int = None):
    session = request.ctx.session
    await tags.upsert_tag(session, body.name, body.color, tag_id)
    if tag_id:
        return response.empty(HTTPStatus.OK)
    else:
        return response.empty(HTTPStatus.CREATED)


@api_bp.delete('/tag/<tag_id:int>')
async def delete_tag_request(request: Request, tag_id: int):
    session = request.ctx.session
    Tag.find_by_id(session, tag_id).delete()
    return response.empty()


@api_bp.post('/notify')
@validate(schema.NotifyRequest)
async def post_notify(_: Request, body: schema.NotifyRequest):
    """Sends a notify Event"""
    url = url_strip_host(body.url)
    Events.send_user_notify(body.message, url)
    return response.empty(HTTPStatus.CREATED)


@api_bp.post('/vin_number_decoder')
@openapi.definition(
    description='Decode a VIN number',
    body=schema.VINDecoderRequest,
    response=schema.VINDecoderResponse,
    validate=True,
)
async def post_vin_number_decoder(_: Request, body: schema.VINDecoderRequest):
    try:
        vin = Vin(body.vin_number)
    except vininfo.exceptions.VininfoException:
        return json_response({}, HTTPStatus.BAD_REQUEST)

    def detail_to_json(details: VinDetails, key: str):
        if details:
            attr = getattr(details, key)
            if attr and attr.name:
                name = attr.name
                if isinstance(name, list):
                    return ', '.join(str(i) for i in name)
                else:
                    return name

    vin = schema.VIN(
        country=vin.country,
        manufacturer=vin.manufacturer,
        region=vin.region,
        years=','.join(map(str, vin.years)),
        body=detail_to_json(vin.details, 'body'),
        engine=detail_to_json(vin.details, 'engine'),
        model=detail_to_json(vin.details, 'model'),
        plant=detail_to_json(vin.details, 'plant'),
        transmission=detail_to_json(vin.details, 'transmission'),
        serial=detail_to_json(vin.details, 'serial'),
    )
    return json_response(dict(vin=vin))


@api_bp.get('/upgrade/check')
@openapi.definition(description='Check for available WROLPi updates')
@native_only
async def get_upgrade_check(request: Request):
    """
    Check if an update is available by comparing local git HEAD with origin/{branch}.

    Query params:
        force: If 'true', force a fresh git fetch before checking.
    """
    from wrolpi.upgrade import check_for_update

    force = request.args.get('force', 'false').lower() == 'true'
    result = check_for_update(fetch=force)

    # Update shared_ctx.status so /api/status returns the latest info.
    # Using shared_ctx.status (a manager.dict) ensures info is shared across all workers.
    api_app.shared_ctx.status['update_available'] = result.get('update_available', False)
    api_app.shared_ctx.status['latest_commit'] = result.get('latest_commit')
    api_app.shared_ctx.status['current_commit'] = result.get('current_commit')
    api_app.shared_ctx.status['commits_behind'] = result.get('commits_behind', 0)

    return json_response(result)


@api_bp.post('/upgrade/start')
@openapi.definition(description='Start WROLPi upgrade')
@native_only
@wrol_mode_check
async def post_upgrade_start(_: Request):
    """
    Trigger the WROLPi upgrade process.

    This executes /opt/wrolpi/upgrade.sh which will:
    1. Stop the API and app services
    2. Fetch latest code from git
    3. Run upgrade scripts
    4. Restart services

    The frontend should redirect to the maintenance page after calling this.
    Returns 202 Accepted as the upgrade runs asynchronously.
    """
    from wrolpi.upgrade import start_upgrade

    await start_upgrade()
    return response.empty(HTTPStatus.ACCEPTED)


@api_bp.post('/search_suggestions')
@openapi.definition(
    description='Suggest related Channels/Domains/etc. to the user.',
    body=schema.SearchSuggestionsRequest,
    validate=True,
)
async def post_search_suggestions(request: Request, body: schema.SearchSuggestionsRequest):
    from modules.videos.channel.lib import search_channels_by_name
    from modules.archive.lib import search_domains_by_name
    from modules.docs.lib import search_authors_by_name, search_subjects_by_name

    session = request.ctx.session
    channels, domains, authors, subjects = await asyncio.gather(
        search_channels_by_name(session, body.search_str, order_by_video_count=body.order_by_video_count),
        search_domains_by_name(session, body.search_str),
        search_authors_by_name(session, body.search_str),
        search_subjects_by_name(session, body.search_str),
    )

    ret = dict(
        channels=channels,
        domains=domains,
        authors=authors,
        subjects=subjects,
    )
    return json_response(ret)


@api_bp.post('/search_file_estimates')
@openapi.definition(
    description='Get a count of FileGroup suggestions.',
    body=schema.SearchFileEstimateRequest,
    validate=True,
)
async def post_search_file_estimates(_: Request, body: schema.SearchFileEstimateRequest):
    """Used by the Global search to suggest FileGroup count to the user."""
    counts = await search_file_suggestion_count(
        body.search_str,
        body.tag_names,
        body.mimetypes,
        body.months,
        body.from_year,
        body.to_year,
        body.any_tag,
    )

    ret = dict(
        file_groups=counts['file_groups'],
        file_groups_deep=counts['file_groups_deep'],
    )
    return json_response(ret)


@api_bp.post('/search_other_estimates')
@openapi.definition(
    description='Get a count of other suggestions.',
    body=schema.SearchOtherEstimateRequest,
    validate=True,
)
async def post_search_other_estimates(_: Request, body: schema.SearchOtherEstimateRequest):
    """Used by the Global search to suggest FileGroup count to the user."""
    others = await search_other_estimates(body.tag_names)
    ret = dict(others=others)
    return json_response(ret)


# Browser extension distribution.
# Files are committed to wrolpi/static/extensions/ and served as binary
# downloads. The whitelist prevents path traversal and limits exposure to
# only the two filenames the install page knows about.
EXTENSION_DIR = pathlib.Path(__file__).parent / 'static' / 'extensions'

EXTENSION_FILES = {
    'wrolpi-chrome.zip': 'application/zip',
    # Firefox click-to-install requires this exact Content-Type.
    'wrolpi-firefox.xpi': 'application/x-xpinstall',
}


@api_bp.get('/extensions')
@openapi.description('Metadata for the WROLPi browser extension binaries.')
async def get_extensions_metadata(_: Request):
    versions = {}
    versions_path = EXTENSION_DIR / 'versions.json'
    if versions_path.is_file():
        try:
            versions = json.loads(versions_path.read_text())
        except json.JSONDecodeError:
            logger.warning(f'Could not parse {versions_path}')
    files = {}
    for name in EXTENSION_FILES:
        path = EXTENSION_DIR / name
        files[name] = {
            'available': path.is_file(),
            'size_bytes': path.stat().st_size if path.is_file() else None,
        }
    return json_response(dict(files=files, versions=versions))


@api_bp.get('/extensions/<filename:str>')
@openapi.description('Download a WROLPi browser extension binary.')
async def get_extension_file(_: Request, filename: str):
    if filename not in EXTENSION_FILES:
        return response.json({'error': f'Unknown extension file: {filename}'}, status=HTTPStatus.NOT_FOUND)
    path = EXTENSION_DIR / filename
    if not path.is_file():
        return response.json({'error': f'Extension file not installed: {filename}'},
                             status=HTTPStatus.NOT_FOUND)
    mime_type = EXTENSION_FILES[filename]
    headers = {}
    # Firefox click-to-install requires application/x-xpinstall AND that we do
    # NOT send Content-Disposition: attachment — the latter forces the browser
    # into "save file" mode, bypassing the add-on install handler. The Chrome
    # zip still wants attachment so the browser writes a file instead of
    # navigating away from the page.
    if mime_type != 'application/x-xpinstall':
        headers['Content-Disposition'] = f'attachment; filename="{filename}"'
    return await response.file(str(path), mime_type=mime_type, headers=headers)