#!/usr/bin/env python3

"""Utilities for dealing with webcam images."""

import logging
import platform
import subprocess
from typing import NamedTuple, Optional

import cv2  # type: ignore
import numpy as np
import requests

import decorator_utils

logger = logging.getLogger(__name__)


class RawJpgHsv(NamedTuple):
    """Raw image bytes, the jpeg image and the HSV (hue saturation value) image."""
    raw: Optional[bytes]
    jpg: Optional[np.ndarray]
    hsv: Optional[np.ndarray]


class BlueIrisImageMetadata(NamedTuple):
    """Is a Blue Iris image bad (big grey borders around it) or infrared?"""
    is_bad_image: bool
    is_infrared_image: bool


def analyze_blue_iris_image(hsv: np.ndarray) -> BlueIrisImageMetadata:
    """See if a Blue Iris image is bad and infrared."""
    rows, cols, _ = hsv.shape
    num_pixels = rows * cols
    hs_zero_count = 0
    gray_count = 0
    for r in range(rows):
        for c in range(cols):
            pixel = hsv[(r, c)]
            if pixel[0] == 0 and pixel[1] == 0:
                hs_zero_count += 1
            if abs(pixel[2] - 64) <= 10:
                gray_count += 1
    logger.debug(f"gray#={gray_count}, hs0#={hs_zero_count}")
    return BlueIrisImageMetadata(
        gray_count > (num_pixels * 0.33), hs_zero_count > (num_pixels * 0.75)
    )


@decorator_utils.retry_if_none(tries=2, delay_sec=1, backoff=1.1)
def fetch_camera_image_from_video_server(
    camera_name: str, *, width: int = 256, quality: int = 70
) -> Optional[bytes]:
    """Fetch the raw webcam image from the video server."""
    camera_name = camera_name.replace(".house", "")
    camera_name = camera_name.replace(".cabin", "")
    url = f"http://10.0.0.56:81/image/{camera_name}?w={width}&q={quality}"
    try:
        response = requests.get(url, stream=False, timeout=10.0)
        if response.ok:
            raw = response.content
            tmp = np.frombuffer(raw, dtype="uint8")
            jpg = cv2.imdecode(tmp, cv2.IMREAD_COLOR)
            hsv = cv2.cvtColor(jpg, cv2.COLOR_BGR2HSV)
            (is_bad_image, _) = analyze_blue_iris_image(hsv)
            if not is_bad_image:
                logger.debug(f"Got a good image from {url}")
                return raw
    except Exception as e:
        logger.exception(e)
    logger.warning(f"Got a bad image or HTTP error from {url}")
    return None


def blue_iris_camera_name_to_hostname(camera_name: str) -> str:
    mapping = {
        "driveway": "driveway.house",
        "backyard": "backyard.house",
        "frontdoor": "frontdoor.house",
        "cabin_driveway": "driveway.cabin",
    }
    camera_name = mapping.get(camera_name, camera_name)
    if "." not in camera_name:
        hostname = platform.node()
        suffix = hostname.split(".")[-1]
        camera_name += f".{suffix}"
    return camera_name


@decorator_utils.retry_if_none(tries=2, delay_sec=1, backoff=1.1)
def fetch_camera_image_from_rtsp_stream(
    camera_name: str, *, width: int = 256
) -> Optional[bytes]:
    """Fetch the raw webcam image straight from the webcam's RTSP stream."""
    hostname = blue_iris_camera_name_to_hostname(camera_name)
    try:
        cmd = [
            "/usr/bin/timeout",
            "-k 9s",
            "8s",
            "/usr/local/bin/ffmpeg",
            "-y",
            "-i",
            f"rtsp://camera:IaLaIok@{hostname}:554/live",
            "-f",
            "singlejpeg",
            "-vframes",
            "1",
            "-vf",
            f"scale={width}:-1",
            "-",
        ]
        with subprocess.Popen(
            cmd, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL
        ) as proc:
            out, _ = proc.communicate(timeout=10)
            return out
    except Exception as e:
        logger.exception(e)
    logger.warning("Failed to retrieve image from RTSP stream")
    return None


@decorator_utils.timeout(seconds=30, use_signals=False)
def _fetch_camera_image(
    camera_name: str, *, width: int = 256, quality: int = 70
) -> RawJpgHsv:
    """Fetch a webcam image given the camera name."""
    logger.debug("Trying to fetch camera image from video server")
    raw = fetch_camera_image_from_video_server(
        camera_name, width=width, quality=quality
    )
    if raw is None:
        logger.debug(
            "Reading from video server failed; trying direct RTSP stream"
        )
        raw = fetch_camera_image_from_rtsp_stream(camera_name, width=width)
    if raw is not None and len(raw) > 0:
        tmp = np.frombuffer(raw, dtype="uint8")
        jpg = cv2.imdecode(tmp, cv2.IMREAD_COLOR)
        hsv = cv2.cvtColor(jpg, cv2.COLOR_BGR2HSV)
        return RawJpgHsv(
            raw=raw,
            jpg=jpg,
            hsv=hsv,
        )
    logger.warning(
        "Failed to retieve image from both video server and direct RTSP stream"
    )
    return RawJpgHsv(None, None, None)


def fetch_camera_image(
    camera_name: str, *, width: int = 256, quality: int = 70
) -> RawJpgHsv:
    try:
        return _fetch_camera_image(camera_name, width=width, quality=quality)
    except decorator_utils.TimeoutError:
        return RawJpgHsv(None, None, None)