"""Handles inserting and maintaining ffmpeg presets."""

import logging
import os

from typing import Any

from frigate.version import VERSION
from frigate.const import BTBN_PATH
from frigate.util import vainfo_hwaccel


logger = logging.getLogger(__name__)


class LibvaGpuSelector:
    "Automatically selects the correct libva GPU."

    _selected_gpu = None

    def get_selected_gpu(self) -> str:
        """Get selected libva GPU."""
        if not os.path.exists("/dev/dri"):
            return ""

        if self._selected_gpu:
            return self._selected_gpu

        devices = list(filter(lambda d: d.startswith("render"), os.listdir("/dev/dri")))

        if len(devices) < 2:
            self._selected_gpu = "/dev/dri/renderD128"
            return self._selected_gpu

        for device in devices:
            check = vainfo_hwaccel(device_name=device)

            logger.debug(f"{device} return vainfo status code: {check.returncode}")

            if check.returncode == 0:
                self._selected_gpu = f"/dev/dri/{device}"
                return self._selected_gpu

        return ""


TIMEOUT_PARAM = "-timeout" if os.path.exists(BTBN_PATH) else "-stimeout"

_gpu_selector = LibvaGpuSelector()
_user_agent_args = [
    "-user_agent",
    f"FFmpeg Frigate/{VERSION}",
]

PRESETS_HW_ACCEL_DECODE = {
    "preset-rpi-32-h264": ["-c:v", "h264_v4l2m2m"],
    "preset-rpi-64-h264": ["-c:v", "h264_v4l2m2m"],
    "preset-vaapi": [
        "-hwaccel_flags",
        "allow_profile_mismatch",
        "-hwaccel",
        "vaapi",
        "-hwaccel_device",
        _gpu_selector.get_selected_gpu(),
        "-hwaccel_output_format",
        "vaapi",
    ],
    "preset-intel-qsv-h264": [
        "-hwaccel",
        "qsv",
        "-qsv_device",
        _gpu_selector.get_selected_gpu(),
        "-hwaccel_output_format",
        "qsv",
        "-c:v",
        "h264_qsv",
    ],
    "preset-intel-qsv-h265": [
        "-load_plugin",
        "hevc_hw",
        "-hwaccel",
        "qsv",
        "-qsv_device",
        _gpu_selector.get_selected_gpu(),
        "-hwaccel_output_format",
        "qsv",
        "-c:v",
        "hevc_qsv",
    ],
    "preset-nvidia-h264": [
        "-hwaccel",
        "cuda",
        "-hwaccel_output_format",
        "cuda",
        "-extra_hw_frames",
        "2",
        "-c:v",
        "h264_cuvid",
    ],
    "preset-nvidia-h265": [
        "-hwaccel",
        "cuda",
        "-hwaccel_output_format",
        "cuda",
        "-extra_hw_frames",
        "2",
        "-c:v",
        "hevc_cuvid",
    ],
    "preset-nvidia-mjpeg": [
        "-hwaccel",
        "cuda",
        "-hwaccel_output_format",
        "cuda",
        "-extra_hw_frames",
        "2",
        "-c:v",
        "mjpeg_cuvid",
    ],
}

PRESETS_HW_ACCEL_SCALE = {
    "preset-rpi-32-h264": "-r {0} -s {1}x{2}",
    "preset-rpi-64-h264": "-r {0} -s {1}x{2}",
    "preset-vaapi": "-r {0} -vf fps={0},scale_vaapi=w={1}:h={2},hwdownload,format=yuv420p",
    "preset-intel-qsv-h264": "-r {0} -vf vpp_qsv=framerate={0}:w={1}:h={2}:format=nv12,hwdownload,format=nv12,format=yuv420p",
    "preset-intel-qsv-h265": "-r {0} -vf vpp_qsv=framerate={0}:w={1}:h={2}:format=nv12,hwdownload,format=nv12,format=yuv420p",
    "preset-nvidia-h264": "-r {0} -vf fps={0},scale_cuda=w={1}:h={2}:format=nv12,hwdownload,format=nv12,format=yuv420p",
    "preset-nvidia-h265": "-r {0} -vf fps={0},scale_cuda=w={1}:h={2}:format=nv12,hwdownload,format=nv12,format=yuv420p",
    "default": "-r {0} -s {1}x{2}",
}

PRESETS_HW_ACCEL_ENCODE = {
    "preset-rpi-32-h264": "ffmpeg -hide_banner {0} -c:v h264_v4l2m2m -g 50 -bf 0 {1}",
    "preset-rpi-64-h264": "ffmpeg -hide_banner {0} -c:v h264_v4l2m2m -g 50 -bf 0 {1}",
    "preset-vaapi": "ffmpeg -hide_banner -hwaccel vaapi -hwaccel_output_format vaapi -hwaccel_device {2} {0} -c:v h264_vaapi -g 50 -bf 0 -profile:v high -level:v 4.1 -sei:v 0 -an -vf format=vaapi|nv12,hwupload {1}",
    "preset-intel-qsv-h264": "ffmpeg -hide_banner {0} -c:v h264_qsv -g 50 -bf 0 -profile:v high -level:v 4.1 -async_depth:v 1 {1}",
    "preset-intel-qsv-h265": "ffmpeg -hide_banner {0} -c:v h264_qsv -g 50 -bf 0 -profile:v high -level:v 4.1 -async_depth:v 1 {1}",
    "preset-nvidia-h264": "ffmpeg -hide_banner {0} -c:v h264_nvenc -g 50 -profile:v high -level:v auto -preset:v p2 -tune:v ll {1}",
    "preset-nvidia-h265": "ffmpeg -hide_banner {0} -c:v h264_nvenc -g 50 -profile:v high -level:v auto -preset:v p2 -tune:v ll {1}",
    "default": "ffmpeg -hide_banner {0} -c:v libx264 -g 50 -profile:v high -level:v 4.1 -preset:v superfast -tune:v zerolatency {1}",
}


def parse_preset_hardware_acceleration_decode(arg: Any) -> list[str]:
    """Return the correct preset if in preset format otherwise return None."""
    if not isinstance(arg, str):
        return None

    return PRESETS_HW_ACCEL_DECODE.get(arg, None)


def parse_preset_hardware_acceleration_scale(
    arg: Any,
    detect_args: list[str],
    fps: int,
    width: int,
    height: int,
) -> list[str]:
    """Return the correct scaling preset or default preset if none is set."""
    if not isinstance(arg, str) or " " in arg:
        scale = PRESETS_HW_ACCEL_SCALE["default"].format(fps, width, height).split(" ")
        scale.extend(detect_args)
        return scale

    scale = PRESETS_HW_ACCEL_SCALE.get(arg, "")

    if scale:
        scale = scale.format(fps, width, height).split(" ")
        scale.extend(detect_args)
        return scale
    else:
        scale = scale.format(fps, width, height).split(" ")
        scale.extend(detect_args)
        return scale


def parse_preset_hardware_acceleration_encode(arg: Any, input: str, output: str) -> str:
    """Return the correct scaling preset or default preset if none is set."""
    if not isinstance(arg, str):
        return PRESETS_HW_ACCEL_ENCODE["default"].format(input, output)

    return PRESETS_HW_ACCEL_ENCODE.get(arg, PRESETS_HW_ACCEL_ENCODE["default"]).format(
        input,
        output,
        _gpu_selector.get_selected_gpu(),
    )


PRESETS_INPUT = {
    "preset-http-jpeg-generic": _user_agent_args
    + [
        "-r",
        "{}",
        "-stream_loop",
        "-1",
        "-f",
        "image2",
        "-avoid_negative_ts",
        "make_zero",
        "-fflags",
        "nobuffer",
        "-flags",
        "low_delay",
        "-strict",
        "experimental",
        "-fflags",
        "+genpts+discardcorrupt",
        "-use_wallclock_as_timestamps",
        "1",
    ],
    "preset-http-mjpeg-generic": _user_agent_args
    + [
        "-avoid_negative_ts",
        "make_zero",
        "-fflags",
        "nobuffer",
        "-flags",
        "low_delay",
        "-strict",
        "experimental",
        "-fflags",
        "+genpts+discardcorrupt",
        "-use_wallclock_as_timestamps",
        "1",
    ],
    "preset-http-reolink": _user_agent_args
    + [
        "-avoid_negative_ts",
        "make_zero",
        "-fflags",
        "+genpts+discardcorrupt",
        "-flags",
        "low_delay",
        "-strict",
        "experimental",
        "-analyzeduration",
        "1000M",
        "-probesize",
        "1000M",
        "-rw_timeout",
        "5000000",
    ],
    "preset-rtmp-generic": [
        "-avoid_negative_ts",
        "make_zero",
        "-fflags",
        "nobuffer",
        "-flags",
        "low_delay",
        "-strict",
        "experimental",
        "-fflags",
        "+genpts+discardcorrupt",
        "-rw_timeout",
        "5000000",
        "-use_wallclock_as_timestamps",
        "1",
        "-f",
        "live_flv",
    ],
    "preset-rtsp-generic": _user_agent_args
    + [
        "-avoid_negative_ts",
        "make_zero",
        "-fflags",
        "+genpts+discardcorrupt",
        "-rtsp_transport",
        "tcp",
        TIMEOUT_PARAM,
        "5000000",
        "-use_wallclock_as_timestamps",
        "1",
    ],
    "preset-rtsp-restream": _user_agent_args
    + [
        "-rtsp_transport",
        "tcp",
        TIMEOUT_PARAM,
        "5000000",
    ],
    "preset-rtsp-restream-low-latency": _user_agent_args
    + [
        "-rtsp_transport",
        "tcp",
        TIMEOUT_PARAM,
        "5000000",
        "-fflags",
        "nobuffer",
        "-flags",
        "low_delay",
    ],
    "preset-rtsp-udp": _user_agent_args
    + [
        "-avoid_negative_ts",
        "make_zero",
        "-fflags",
        "+genpts+discardcorrupt",
        "-rtsp_transport",
        "udp",
        TIMEOUT_PARAM,
        "5000000",
        "-use_wallclock_as_timestamps",
        "1",
    ],
    "preset-rtsp-blue-iris": _user_agent_args
    + [
        "-user_agent",
        f"FFmpeg Frigate/{VERSION}",
        "-avoid_negative_ts",
        "make_zero",
        "-flags",
        "low_delay",
        "-strict",
        "experimental",
        "-fflags",
        "+genpts+discardcorrupt",
        "-rtsp_transport",
        "tcp",
        TIMEOUT_PARAM,
        "5000000",
        "-use_wallclock_as_timestamps",
        "1",
    ],
}


def parse_preset_input(arg: Any, detect_fps: int) -> list[str]:
    """Return the correct preset if in preset format otherwise return None."""
    if not isinstance(arg, str):
        return None

    if arg == "preset-http-jpeg-generic":
        input = PRESETS_INPUT[arg].copy()
        input[1] = str(detect_fps)
        return input

    return PRESETS_INPUT.get(arg, None)


PRESETS_RECORD_OUTPUT = {
    "preset-record-generic": [
        "-f",
        "segment",
        "-segment_time",
        "10",
        "-segment_format",
        "mp4",
        "-reset_timestamps",
        "1",
        "-strftime",
        "1",
        "-c",
        "copy",
        "-an",
    ],
    "preset-record-generic-audio-aac": [
        "-f",
        "segment",
        "-segment_time",
        "10",
        "-segment_format",
        "mp4",
        "-reset_timestamps",
        "1",
        "-strftime",
        "1",
        "-c:v",
        "copy",
        "-c:a",
        "aac",
    ],
    "preset-record-generic-audio-copy": [
        "-f",
        "segment",
        "-segment_time",
        "10",
        "-segment_format",
        "mp4",
        "-reset_timestamps",
        "1",
        "-strftime",
        "1",
        "-c",
        "copy",
    ],
    "preset-record-mjpeg": [
        "-f",
        "segment",
        "-segment_time",
        "10",
        "-segment_format",
        "mp4",
        "-reset_timestamps",
        "1",
        "-strftime",
        "1",
        "-c:v",
        "libx264",
        "-an",
    ],
    "preset-record-jpeg": [
        "-f",
        "segment",
        "-segment_time",
        "10",
        "-segment_format",
        "mp4",
        "-reset_timestamps",
        "1",
        "-strftime",
        "1",
        "-c:v",
        "libx264",
        "-an",
    ],
    "preset-record-ubiquiti": [
        "-f",
        "segment",
        "-segment_time",
        "10",
        "-segment_format",
        "mp4",
        "-reset_timestamps",
        "1",
        "-strftime",
        "1",
        "-c:v",
        "copy",
        "-ar",
        "44100",
        "-c:a",
        "aac",
    ],
}


def parse_preset_output_record(arg: Any) -> list[str]:
    """Return the correct preset if in preset format otherwise return None."""
    if not isinstance(arg, str):
        return None

    return PRESETS_RECORD_OUTPUT.get(arg, None)


PRESETS_RTMP_OUTPUT = {
    "preset-rtmp-generic": ["-c", "copy", "-f", "flv"],
    "preset-rtmp-mjpeg": ["-c:v", "libx264", "-an", "-f", "flv"],
    "preset-rtmp-jpeg": ["-c:v", "libx264", "-an", "-f", "flv"],
    "preset-rtmp-ubiquiti": [
        "-c:v",
        "copy",
        "-f",
        "flv",
        "-ar",
        "44100",
        "-c:a",
        "aac",
    ],
}


def parse_preset_output_rtmp(arg: Any) -> list[str]:
    """Return the correct preset if in preset format otherwise return None."""
    if not isinstance(arg, str):
        return None

    return PRESETS_RTMP_OUTPUT.get(arg, None)