"""Export recordings to storage."""

import datetime
import logging
import os
import subprocess as sp
import threading
from enum import Enum

from frigate.config import FrigateConfig
from frigate.const import EXPORT_DIR, MAX_PLAYLIST_SECONDS
from frigate.ffmpeg_presets import (
    EncodeTypeEnum,
    parse_preset_hardware_acceleration_encode,
)
from frigate.models import Recordings

logger = logging.getLogger(__name__)


TIMELAPSE_DATA_INPUT_ARGS = "-an -skip_frame nokey"


def lower_priority():
    os.nice(10)


class PlaybackFactorEnum(str, Enum):
    realtime = "realtime"
    timelapse_25x = "timelapse_25x"


class RecordingExporter(threading.Thread):
    """Exports a specific set of recordings for a camera to storage as a single file."""

    def __init__(
        self,
        config: FrigateConfig,
        camera: str,
        start_time: int,
        end_time: int,
        playback_factor: PlaybackFactorEnum,
    ) -> None:
        threading.Thread.__init__(self)
        self.config = config
        self.camera = camera
        self.start_time = start_time
        self.end_time = end_time
        self.playback_factor = playback_factor

    def get_datetime_from_timestamp(self, timestamp: int) -> str:
        """Convenience fun to get a simple date time from timestamp."""
        return datetime.datetime.fromtimestamp(timestamp).strftime("%Y_%m_%d_%H:%M")

    def run(self) -> None:
        logger.debug(
            f"Beginning export for {self.camera} from {self.start_time} to {self.end_time}"
        )
        file_name = f"{EXPORT_DIR}/in_progress.{self.camera}@{self.get_datetime_from_timestamp(self.start_time)}__{self.get_datetime_from_timestamp(self.end_time)}.mp4"
        final_file_name = f"{EXPORT_DIR}/{self.camera}_{self.get_datetime_from_timestamp(self.start_time)}__{self.get_datetime_from_timestamp(self.end_time)}.mp4"

        if (self.end_time - self.start_time) <= MAX_PLAYLIST_SECONDS:
            playlist_lines = f"http://127.0.0.1:5000/vod/{self.camera}/start/{self.start_time}/end/{self.end_time}/index.m3u8"
            ffmpeg_input = (
                f"-y -protocol_whitelist pipe,file,http,tcp -i {playlist_lines}"
            )
        else:
            playlist_lines = []

            # get full set of recordings
            export_recordings = (
                Recordings.select()
                .where(
                    Recordings.start_time.between(self.start_time, self.end_time)
                    | Recordings.end_time.between(self.start_time, self.end_time)
                    | (
                        (self.start_time > Recordings.start_time)
                        & (self.end_time < Recordings.end_time)
                    )
                )
                .where(Recordings.camera == self.camera)
                .order_by(Recordings.start_time.asc())
            )

            # Use pagination to process records in chunks
            page_size = 1000
            num_pages = (export_recordings.count() + page_size - 1) // page_size

            for page in range(1, num_pages + 1):
                playlist = export_recordings.paginate(page, page_size)
                playlist_lines.append(
                    f"file 'http://127.0.0.1:5000/vod/{self.camera}/start/{float(playlist[0].start_time)}/end/{float(playlist[-1].end_time)}/index.m3u8'"
                )

            ffmpeg_input = "-y -protocol_whitelist pipe,file,http,tcp -f concat -safe 0 -i /dev/stdin"

        if self.playback_factor == PlaybackFactorEnum.realtime:
            ffmpeg_cmd = (
                f"ffmpeg -hide_banner {ffmpeg_input} -c copy {file_name}"
            ).split(" ")
        elif self.playback_factor == PlaybackFactorEnum.timelapse_25x:
            ffmpeg_cmd = (
                parse_preset_hardware_acceleration_encode(
                    self.config.ffmpeg.hwaccel_args,
                    f"{TIMELAPSE_DATA_INPUT_ARGS} {ffmpeg_input}",
                    f"{self.config.cameras[self.camera].record.export.timelapse_args} {file_name}",
                    EncodeTypeEnum.timelapse,
                )
            ).split(" ")

        p = sp.run(
            ffmpeg_cmd,
            input="\n".join(playlist_lines),
            encoding="ascii",
            preexec_fn=lower_priority,
            capture_output=True,
        )

        if p.returncode != 0:
            logger.error(
                f"Failed to export recording for command {' '.join(ffmpeg_cmd)}"
            )
            logger.error(p.stderr)
            return

        logger.debug(f"Updating finalized export {file_name}")
        os.rename(file_name, final_file_name)
        logger.debug(f"Finished exporting {file_name}")