import datetime
import logging
import multiprocessing as mp
import os
import secrets
import shutil
from collections.abc import Callable
from multiprocessing import Queue
from multiprocessing.managers import DictProxy, SyncManager
from multiprocessing.synchronize import Event as MpEvent
from pathlib import Path

import psutil
import uvicorn
from peewee_migrate import Router
from playhouse.sqlite_ext import SqliteExtDatabase

from frigate.api.auth import hash_password
from frigate.api.fastapi_app import create_fastapi_app
from frigate.camera import CameraMetrics, PTZMetrics
from frigate.camera.maintainer import CameraMaintainer
from frigate.comms.base_communicator import Communicator
from frigate.comms.dispatcher import Dispatcher
from frigate.comms.event_metadata_updater import EventMetadataPublisher
from frigate.comms.inter_process import InterProcessCommunicator
from frigate.comms.mqtt import MqttClient
from frigate.comms.object_detector_signaler import DetectorProxy
from frigate.comms.webpush import WebPushClient
from frigate.comms.ws import WebSocketClient
from frigate.comms.zmq_proxy import ZmqProxy
from frigate.config.camera.updater import CameraConfigUpdatePublisher
from frigate.config.config import FrigateConfig
from frigate.config.holder import ConfigHolder
from frigate.config.profile_manager import ProfileManager
from frigate.const import (
    CACHE_DIR,
    CLIPS_DIR,
    CONFIG_DIR,
    EXPORT_DIR,
    FACE_DIR,
    MODEL_CACHE_DIR,
    RECORD_DIR,
    THUMB_DIR,
    TRIGGER_DIR,
)
from frigate.data_processing.types import DataProcessorMetrics
from frigate.db.sqlitevecq import SqliteVecQueueDatabase
from frigate.debug_replay import (
    DebugReplayManager,
    cleanup_replay_cameras,
)
from frigate.detectors.detector_config import SceneEnum
from frigate.detectors.detector_types import api_types
from frigate.detectors.device import build_detector_config, runner_names
from frigate.embeddings import EmbeddingProcess, EmbeddingsContext
from frigate.events.audio import AudioProcessor
from frigate.events.cleanup import EventCleanup
from frigate.events.maintainer import EventProcessor
from frigate.jobs.export import reap_stale_exports
from frigate.jobs.motion_search import stop_all_motion_search_jobs
from frigate.log import _stop_logging
from frigate.models import (
    Event,
    Export,
    Notice,
    NoticeStats,
    Previews,
    Recordings,
    RecordingsToDelete,
    Regions,
    ReviewSegment,
    Timeline,
    Trigger,
    User,
)
from frigate.notices import install_registry
from frigate.notices.registry import NoticeRegistry
from frigate.object_detection.base import ObjectDetectProcess
from frigate.object_detection.util import detection_frame_size
from frigate.output.output import OutputProcess
from frigate.ptz.autotrack import PtzAutoTrackerThread
from frigate.ptz.onvif import OnvifController
from frigate.record.cleanup import RecordingCleanup
from frigate.record.export import migrate_exports
from frigate.record.record import RecordProcess
from frigate.review.review import ReviewProcess
from frigate.stats.emitter import StatsEmitter
from frigate.stats.util import stats_init
from frigate.storage import StorageMaintainer
from frigate.timeline import TimelineProcessor
from frigate.track.object_processing import TrackedObjectProcessor
from frigate.util.builtin import empty_and_close_queue
from frigate.util.image import UntrackedSharedMemory
from frigate.util.ownership import chown_to_runtime
from frigate.util.process import FrigateProcess
from frigate.util.runtime_deps import RuntimeDependencyError
from frigate.util.services import set_file_limit
from frigate.version import VERSION
from frigate.watchdog import FrigateWatchdog

logger = logging.getLogger(__name__)


class FrigateApp:
    def __init__(
        self, config: FrigateConfig, manager: SyncManager, stop_event: MpEvent
    ) -> None:
        self.metrics_manager = manager
        self.audio_process: mp.Process | None = None
        self.stop_event = stop_event
        self.detection_queues: dict[SceneEnum, Queue] = {
            model.scene: mp.Queue() for model in config.models
        }
        self.detectors: dict[str, ObjectDetectProcess] = {}
        self.detection_shms: list[mp.shared_memory.SharedMemory] = []
        self.log_queue: Queue = mp.Queue()
        self.camera_metrics: DictProxy = self.metrics_manager.dict()

        self.embeddings_metrics = DataProcessorMetrics(
            self.metrics_manager, list(config.classification.custom.keys())
        )
        self.ptz_metrics: dict[str, PTZMetrics] = {}
        self.processes: dict[str, int] = {}
        self.embeddings: EmbeddingsContext | None = None
        self.config_holder = ConfigHolder(config)

    @property
    def config(self) -> FrigateConfig:
        """The current config, not the one Frigate booted with.

        Read through the holder so the deferred watchdog factories below build
        a replacement process from the config as it is now. There is no setter
        on purpose: a plain attribute would let a caller pin this back to a
        single object and reintroduce the staleness.
        """
        return self.config_holder.config

    def ensure_dirs(self) -> None:
        dirs = [
            CONFIG_DIR,
            RECORD_DIR,
            THUMB_DIR,
            f"{CLIPS_DIR}/cache",
            CACHE_DIR,
            MODEL_CACHE_DIR,
            EXPORT_DIR,
        ]

        if self.config.face_recognition.enabled:
            dirs.append(FACE_DIR)

        if self.config.semantic_search.enabled:
            dirs.append(TRIGGER_DIR)

        for d in dirs:
            if not os.path.exists(d) and not os.path.islink(d):
                logger.info(f"Creating directory: {d}")
                os.makedirs(d, exist_ok=True)
                chown_to_runtime(d)
            else:
                logger.debug(f"Skipping directory: {d}")

    def init_debug_replay_manager(self) -> None:
        self.replay_manager = DebugReplayManager()

    def init_camera_metrics(self) -> None:
        # create camera_metrics
        for camera_name in self.config.cameras.keys():
            self.camera_metrics[camera_name] = CameraMetrics(self.metrics_manager)
            self.ptz_metrics[camera_name] = PTZMetrics(
                autotracker_enabled=self.config.cameras[
                    camera_name
                ].onvif.autotracking.enabled
            )

    def init_queues(self) -> None:
        # Queue for cameras to push tracked objects to
        # leaving room for 2 extra cameras to be added
        self.detected_frames_queue: Queue = mp.Queue(
            maxsize=(
                sum(
                    camera.enabled_in_config == True
                    for camera in self.config.cameras.values()
                )
                + 2
            )
            * 2
        )

        # Queue for timeline events
        self.timeline_queue: Queue = mp.Queue()

    def init_database(self) -> None:
        def vacuum_db(db: SqliteExtDatabase) -> None:
            logger.info("Running database vacuum")
            db.execute_sql("VACUUM;")

            try:
                with open(f"{CONFIG_DIR}/.vacuum", "w") as f:
                    f.write(str(datetime.datetime.now().timestamp()))
            except PermissionError:
                logger.error("Unable to write to /config to save DB state")

        # Migrate DB schema
        migrate_db = SqliteExtDatabase(self.config.database.path)

        # Run migrations
        del logging.getLogger("peewee_migrate").handlers[:]
        router = Router(migrate_db)

        if len(router.diff) > 0:
            logger.info("Making backup of DB before migrations...")
            shutil.copyfile(
                self.config.database.path,
                self.config.database.path.replace("frigate.db", "backup.db"),
            )

        router.run()

        # check if vacuum needs to be run
        if os.path.exists(f"{CONFIG_DIR}/.vacuum"):
            with open(f"{CONFIG_DIR}/.vacuum") as f:
                try:
                    timestamp = round(float(f.readline()))
                except Exception:
                    timestamp = 0

                if (
                    timestamp
                    < (
                        datetime.datetime.now() - datetime.timedelta(weeks=2)
                    ).timestamp()
                ):
                    vacuum_db(migrate_db)
        else:
            vacuum_db(migrate_db)

        migrate_db.close()

        # a root frigate service creates these as root; wal and shm recreated
        # later in the run are realigned by the per-boot /config sweep
        for db_file in (
            self.config.database.path,
            f"{self.config.database.path}-wal",
            f"{self.config.database.path}-shm",
            self.config.database.path.replace("frigate.db", "backup.db"),
        ):
            if os.path.exists(db_file):
                chown_to_runtime(db_file)

    def init_go2rtc(self) -> None:
        for proc in psutil.process_iter(["pid", "name"]):
            if proc.info["name"] == "go2rtc":
                logger.info(f"go2rtc process pid: {proc.info['pid']}")
                self.processes["go2rtc"] = proc.info["pid"]

    def init_recording_manager(self) -> None:
        recording_process = RecordProcess(self.config, self.stop_event)
        self.recording_process = recording_process
        recording_process.start()
        self.processes["recording"] = recording_process.pid or 0
        logger.info(f"Recording process started: {recording_process.pid}")

    def init_review_segment_manager(self) -> None:
        review_segment_process = ReviewProcess(self.config, self.stop_event)
        self.review_segment_process = review_segment_process
        review_segment_process.start()
        self.processes["review_segment"] = review_segment_process.pid or 0
        logger.info(f"Review process started: {review_segment_process.pid}")

    def init_embeddings_manager(self) -> None:
        # always start the embeddings process
        embedding_process = EmbeddingProcess(
            self.config, self.embeddings_metrics, self.stop_event
        )
        self.embedding_process = embedding_process
        embedding_process.start()
        self.processes["embeddings"] = embedding_process.pid or 0
        logger.info(f"Embedding process started: {embedding_process.pid}")

    def bind_database(self) -> None:
        """Bind db to the main process."""
        # NOTE: all db accessing processes need to be created before the db can be bound to the main process
        self.db = SqliteVecQueueDatabase(
            self.config.database.path,
            pragmas={
                "auto_vacuum": "FULL",  # Does not defragment database
                "cache_size": -512 * 1000,  # 512MB of cache,
                "synchronous": "NORMAL",  # Safe when using WAL https://www.sqlite.org/pragma.html#pragma_synchronous
            },
            timeout=max(
                60,
                10
                * len([c for c in self.config.cameras.values() if c.enabled_in_config]),
            ),
            load_vec_extension=True,
        )
        models = [
            Event,
            Export,
            Notice,
            NoticeStats,
            Previews,
            Recordings,
            RecordingsToDelete,
            Regions,
            ReviewSegment,
            Timeline,
            User,
            Trigger,
        ]
        self.db.bind(models)

    def check_db_data_migrations(self) -> None:
        # check if vacuum needs to be run
        if not os.path.exists(f"{CONFIG_DIR}/.exports"):
            try:
                with open(f"{CONFIG_DIR}/.exports", "w") as f:
                    f.write(str(datetime.datetime.now().timestamp()))
            except PermissionError:
                logger.error("Unable to write to /config to save export state")

            migrate_exports(self.config.ffmpeg, list(self.config.cameras.keys()))

    def install_notice_registry(self) -> None:
        self.notice_registry = NoticeRegistry()
        install_registry(self.notice_registry)

    def init_embeddings_client(self) -> None:
        # Create a client for other processes to use
        self.embeddings = EmbeddingsContext(self.db)

    def init_inter_process_communicator(self) -> None:
        self.inter_process_communicator = InterProcessCommunicator()
        self.inter_config_updater = CameraConfigUpdatePublisher()
        self.event_metadata_updater = EventMetadataPublisher()
        self.inter_zmq_proxy = ZmqProxy()
        self.detection_proxy = DetectorProxy()

    def init_onvif(self) -> None:
        self.onvif_controller = OnvifController(self.config, self.ptz_metrics)

    def init_dispatcher(self) -> None:
        comms: list[Communicator] = []

        if self.config.mqtt.enabled:
            comms.append(MqttClient(self.config))

        notification_cameras = [
            c
            for c in self.config.cameras.values()
            if c.enabled and c.notifications.enabled_in_config
        ]

        if notification_cameras:
            comms.append(WebPushClient(self.config, self.stop_event))

        comms.append(WebSocketClient(self.config))
        comms.append(self.inter_process_communicator)

        self.dispatcher = Dispatcher(
            self.config,
            self.inter_config_updater,
            self.onvif_controller,
            self.ptz_metrics,
            comms,
            notice_registry=self.notice_registry,
        )
        self.dispatcher.start_communicators()

    def init_profile_manager(self) -> None:
        self.profile_manager = ProfileManager(
            self.config, self.inter_config_updater, self.dispatcher
        )
        self.dispatcher.profile_manager = self.profile_manager

    def ensure_detector_dependencies(self) -> None:
        """Install runtimes for the configured detector types.

        Runs before any detector process starts so one install serves them
        all and the user site is on sys.path before the forkserver copies it.
        A failure is logged and startup continues; the detector process then
        fails on its own with a clear import error.
        """
        detector_types = {
            spec.detector
            for model in self.config.models
            for spec in self.config.devices_for_model(model)
        }

        for detector_type in sorted(detector_types):
            try:
                api_types[detector_type].ensure_dependencies()
            except RuntimeDependencyError as err:
                logger.error("Unable to prepare the %s runtime: %s", detector_type, err)

    def start_detectors(self) -> None:
        model_cameras: dict[SceneEnum, list[str]] = {
            model.scene: [] for model in self.config.models
        }

        for name in self.config.cameras.keys():
            model = self.config.model_for_camera(name)
            model_cameras[model.scene].append(name)

            try:
                shm_in = UntrackedSharedMemory(
                    name=name,
                    create=True,
                    size=detection_frame_size(model),
                )
            except FileExistsError:
                shm_in = UntrackedSharedMemory(name=name)

            try:
                shm_out = UntrackedSharedMemory(
                    name=f"out-{name}", create=True, size=20 * 6 * 4
                )
            except FileExistsError:
                shm_out = UntrackedSharedMemory(name=f"out-{name}")

            self.detection_shms.append(shm_in)
            self.detection_shms.append(shm_out)

        # a device may be listed more than once to run additional inference
        # processes on it, so names are only unique once de-duplicated
        all_devices = [
            device
            for model in self.config.models
            for device in self.config.devices_for_model(model)
        ]
        names = iter(runner_names(all_devices))

        for model in self.config.models:
            for device in self.config.devices_for_model(model):
                name = next(names)
                self.detectors[name] = ObjectDetectProcess(
                    name,
                    self.detection_queues[model.scene],
                    model_cameras[model.scene],
                    self.config,
                    build_detector_config(device, model),
                    self.stop_event,
                )

    def start_ptz_autotracker(self) -> None:
        self.ptz_autotracker_thread = PtzAutoTrackerThread(
            self.config,
            self.onvif_controller,
            self.ptz_metrics,
            self.dispatcher,
            self.stop_event,
        )
        self.ptz_autotracker_thread.start()

    def start_detected_frames_processor(self) -> None:
        self.detected_frames_processor = TrackedObjectProcessor(
            self.config,
            self.dispatcher,
            self.detected_frames_queue,
            self.ptz_autotracker_thread,
            self.stop_event,
        )
        self.detected_frames_processor.start()

    def start_video_output_processor(self) -> None:
        output_processor = OutputProcess(self.config, self.stop_event)
        self.output_processor = output_processor
        output_processor.start()
        logger.info(f"Output process started: {output_processor.pid}")

    def start_camera_processor(self) -> None:
        self.camera_maintainer = CameraMaintainer(
            self.config,
            self.detection_queues,
            self.detected_frames_queue,
            self.camera_metrics,
            self.ptz_metrics,
            self.stop_event,
            self.metrics_manager,
        )
        self.camera_maintainer.start()

    def start_audio_processor(self) -> None:
        self.audio_process = AudioProcessor(
            self.config, self.camera_metrics, self.stop_event
        )
        self.audio_process.start()
        self.processes["audio_detector"] = self.audio_process.pid or 0

    def start_timeline_processor(self) -> None:
        self.timeline_processor = TimelineProcessor(
            self.config, self.timeline_queue, self.stop_event
        )
        self.timeline_processor.start()

    def start_event_processor(self) -> None:
        self.event_processor = EventProcessor(
            self.config,
            self.timeline_queue,
            self.stop_event,
        )
        self.event_processor.start()

    def start_event_cleanup(self) -> None:
        self.event_cleanup = EventCleanup(self.config, self.stop_event, self.db)
        self.event_cleanup.start()

    def start_record_cleanup(self) -> None:
        self.record_cleanup = RecordingCleanup(self.config, self.stop_event)
        self.record_cleanup.start()

    def start_storage_maintainer(self) -> None:
        self.storage_maintainer = StorageMaintainer(self.config, self.stop_event)
        self.storage_maintainer.start()

    def start_stats_emitter(self) -> None:
        self.stats_emitter = StatsEmitter(
            self.config,
            stats_init(
                self.config,
                self.camera_metrics,
                self.embeddings_metrics,
                self.detectors,
                self.processes,
                self.storage_maintainer,
            ),
            self.stop_event,
        )
        self.stats_emitter.start()

    def start_watchdog(self) -> None:
        self.frigate_watchdog = FrigateWatchdog(self.detectors, self.stop_event)

        # (attribute on self, key in self.processes, factory)
        specs: list[tuple[str, str, Callable[[], FrigateProcess]]] = [
            (
                "embedding_process",
                "embeddings",
                lambda: EmbeddingProcess(
                    self.config, self.embeddings_metrics, self.stop_event
                ),
            ),
            (
                "recording_process",
                "recording",
                lambda: RecordProcess(self.config, self.stop_event),
            ),
            (
                "review_segment_process",
                "review_segment",
                lambda: ReviewProcess(self.config, self.stop_event),
            ),
            (
                "output_processor",
                "output",
                lambda: OutputProcess(self.config, self.stop_event),
            ),
        ]

        for attr, key, factory in specs:
            if not hasattr(self, attr):
                continue

            def on_restart(
                proc: FrigateProcess, _attr: str = attr, _key: str = key
            ) -> None:
                setattr(self, _attr, proc)
                self.processes[_key] = proc.pid or 0

            self.frigate_watchdog.register(
                key, getattr(self, attr), factory, on_restart
            )

        self.frigate_watchdog.start()

    def init_auth(self) -> None:
        if self.config.auth.enabled:
            if User.select().count() == 0:
                password = secrets.token_hex(16)
                password_hash = hash_password(
                    password, iterations=self.config.auth.hash_iterations
                )
                User.insert(
                    {
                        User.username: "admin",
                        User.role: "admin",
                        User.password_hash: password_hash,
                        User.notification_tokens: [],
                    }
                ).execute()

                self.config.auth.admin_first_time_login = True

                logger.info("********************************************************")
                logger.info("********************************************************")
                logger.info("***    Auth is enabled, but no users exist.          ***")
                logger.info("***    Created a default user:                       ***")
                logger.info("***    User: admin                                   ***")
                logger.info(f"***    Password: {password}   ***")
                logger.info("********************************************************")
                logger.info("********************************************************")
            elif self.config.auth.reset_admin_password:
                password = secrets.token_hex(16)
                password_hash = hash_password(
                    password, iterations=self.config.auth.hash_iterations
                )
                User.replace(
                    username="admin",
                    role="admin",
                    password_hash=password_hash,
                    notification_tokens=[],
                ).execute()

                logger.info("********************************************************")
                logger.info("********************************************************")
                logger.info("***    Reset admin password set in the config.       ***")
                logger.info(f"***    Password: {password}   ***")
                logger.info("********************************************************")
                logger.info("********************************************************")

    def start(self) -> None:
        logger.info(f"Starting Frigate ({VERSION})")

        # Ensure global state.
        self.ensure_dirs()
        self.ensure_detector_dependencies()

        # Set soft file limits.
        set_file_limit()

        # Start frigate services.
        self.init_debug_replay_manager()
        self.init_camera_metrics()
        self.init_queues()
        self.init_database()
        self.init_onvif()
        self.init_recording_manager()
        self.init_review_segment_manager()
        self.init_go2rtc()
        self.init_embeddings_manager()
        self.bind_database()
        self.check_db_data_migrations()
        self.install_notice_registry()

        # Clean up any stale replay camera artifacts (filesystem + DB)
        cleanup_replay_cameras()

        # Reap any Export rows still marked in_progress from a previous
        # session (crash, kill, broken migration). Runs synchronously before
        # uvicorn binds so no API request can observe a stale row.
        reap_stale_exports()

        self.init_inter_process_communicator()
        self.start_detectors()
        self.init_dispatcher()
        self.init_profile_manager()

        # workers get a copy of the config and can miss the broadcast below, so
        # apply both layers here. must stay after init_profile_manager(), which
        # snapshots the base config that profile deactivation resets to
        self.profile_manager.restore_persisted_profile_to_config()
        self.dispatcher.reapply_runtime_state_to_config()

        self.init_embeddings_client()
        self.start_video_output_processor()
        self.start_ptz_autotracker()
        self.start_detected_frames_processor()
        self.start_camera_processor()
        self.start_audio_processor()
        self.start_storage_maintainer()
        self.start_stats_emitter()
        self.start_timeline_processor()
        self.start_event_processor()
        self.start_event_cleanup()
        self.start_record_cleanup()
        self.start_watchdog()

        # publish for the recording/review/embeddings processes, which start
        # before the config can be corrected, and for the retained MQTT states
        self.profile_manager.restore_persisted_profile()
        self.dispatcher.restore_runtime_state()

        self.init_auth()

        try:
            uvicorn.run(
                create_fastapi_app(
                    self.config,
                    self.db,
                    self.embeddings,
                    self.detected_frames_processor,
                    self.storage_maintainer,
                    self.onvif_controller,
                    self.stats_emitter,
                    self.event_metadata_updater,
                    self.inter_config_updater,
                    self.replay_manager,
                    self.dispatcher,
                    self.profile_manager,
                    config_holder=self.config_holder,
                    notice_registry=self.notice_registry,
                ),
                host="127.0.0.1",
                port=5001,
                log_level="error",
            )
        finally:
            self.stop()

    def stop(self) -> None:
        logger.info("Stopping...")

        # used by the docker healthcheck
        Path("/dev/shm/.frigate-is-stopping").touch()

        # Cancel any running motion search jobs before setting stop_event
        stop_all_motion_search_jobs()

        self.stop_event.set()

        # set an end_time on entries without an end_time before exiting
        Event.update(
            end_time=datetime.datetime.now().timestamp(), has_snapshot=False
        ).where(Event.end_time == None).execute()
        ReviewSegment.update(end_time=datetime.datetime.now().timestamp()).where(
            ReviewSegment.end_time == None
        ).execute()

        # stop the audio process
        if self.audio_process:
            self.audio_process.terminate()
            self.audio_process.join()

        # stop the onvif controller
        if self.onvif_controller:
            self.onvif_controller.close()

        # ensure the detectors are done
        for detector in self.detectors.values():
            detector.stop()

        for detection_queue in self.detection_queues.values():
            empty_and_close_queue(detection_queue)

        logger.info("Detection queues closed")

        self.detected_frames_processor.join()
        empty_and_close_queue(self.detected_frames_queue)
        logger.info("Detected frames queue closed")

        self.timeline_processor.join()
        self.event_processor.join()
        empty_and_close_queue(self.timeline_queue)
        logger.info("Timeline queue closed")

        self.output_processor.terminate()
        self.output_processor.join()

        self.recording_process.terminate()
        self.recording_process.join()

        self.review_segment_process.terminate()
        self.review_segment_process.join()

        self.dispatcher.stop()
        self.ptz_autotracker_thread.join()

        self.event_cleanup.join()
        self.record_cleanup.join()
        self.stats_emitter.join()
        self.frigate_watchdog.join()
        self.camera_maintainer.join()
        self.db.stop()

        # Save embeddings stats to disk
        if self.embeddings:
            self.embeddings.stop()

        # Stop Communicators
        self.inter_process_communicator.stop()
        self.inter_config_updater.stop()
        self.event_metadata_updater.stop()
        self.inter_zmq_proxy.stop()
        self.detection_proxy.stop()

        while len(self.detection_shms) > 0:
            shm = self.detection_shms.pop()
            shm.close()
            shm.unlink()

        _stop_logging()
        self.metrics_manager.shutdown()