"""Utilities for builtin types manipulation."""

import copy
import datetime
import logging
import re
import shlex
import urllib.parse
from collections import Counter
from collections.abc import Mapping
from pathlib import Path
from typing import Any, Optional, Tuple

import numpy as np
import pytz
import yaml
from ruamel.yaml import YAML
from tzlocal import get_localzone
from zoneinfo import ZoneInfoNotFoundError

from frigate.const import REGEX_HTTP_CAMERA_USER_PASS, REGEX_RTSP_CAMERA_USER_PASS

logger = logging.getLogger(__name__)


class EventsPerSecond:
    def __init__(self, max_events=1000, last_n_seconds=10):
        self._start = None
        self._max_events = max_events
        self._last_n_seconds = last_n_seconds
        self._timestamps = []

    def start(self):
        self._start = datetime.datetime.now().timestamp()

    def update(self):
        now = datetime.datetime.now().timestamp()
        if self._start is None:
            self._start = now
        self._timestamps.append(now)
        # truncate the list when it goes 100 over the max_size
        if len(self._timestamps) > self._max_events + 100:
            self._timestamps = self._timestamps[(1 - self._max_events) :]
        self.expire_timestamps(now)

    def eps(self):
        now = datetime.datetime.now().timestamp()
        if self._start is None:
            self._start = now
        # compute the (approximate) events in the last n seconds
        self.expire_timestamps(now)
        seconds = min(now - self._start, self._last_n_seconds)
        # avoid divide by zero
        if seconds == 0:
            seconds = 1
        return len(self._timestamps) / seconds

    # remove aged out timestamps
    def expire_timestamps(self, now):
        threshold = now - self._last_n_seconds
        while self._timestamps and self._timestamps[0] < threshold:
            del self._timestamps[0]


def deep_merge(dct1: dict, dct2: dict, override=False, merge_lists=False) -> dict:
    """
    :param dct1: First dict to merge
    :param dct2: Second dict to merge
    :param override: if same key exists in both dictionaries, should override? otherwise ignore. (default=True)
    :return: The merge dictionary
    """
    merged = copy.deepcopy(dct1)
    for k, v2 in dct2.items():
        if k in merged:
            v1 = merged[k]
            if isinstance(v1, dict) and isinstance(v2, Mapping):
                merged[k] = deep_merge(v1, v2, override)
            elif isinstance(v1, list) and isinstance(v2, list):
                if merge_lists:
                    merged[k] = v1 + v2
            else:
                if override:
                    merged[k] = copy.deepcopy(v2)
        else:
            merged[k] = copy.deepcopy(v2)
    return merged


def load_config_with_no_duplicates(raw_config) -> dict:
    """Get config ensuring duplicate keys are not allowed."""

    # https://stackoverflow.com/a/71751051
    # important to use SafeLoader here to avoid RCE
    class PreserveDuplicatesLoader(yaml.loader.SafeLoader):
        pass

    def map_constructor(loader, node, deep=False):
        keys = [loader.construct_object(node, deep=deep) for node, _ in node.value]
        vals = [loader.construct_object(node, deep=deep) for _, node in node.value]
        key_count = Counter(keys)
        data = {}
        for key, val in zip(keys, vals):
            if key_count[key] > 1:
                raise ValueError(
                    f"Config input {key} is defined multiple times for the same field, this is not allowed."
                )
            else:
                data[key] = val
        return data

    PreserveDuplicatesLoader.add_constructor(
        yaml.resolver.BaseResolver.DEFAULT_MAPPING_TAG, map_constructor
    )
    return yaml.load(raw_config, PreserveDuplicatesLoader)


def clean_camera_user_pass(line: str) -> str:
    """Removes user and password from line."""
    rtsp_cleaned = re.sub(REGEX_RTSP_CAMERA_USER_PASS, "://*:*@", line)
    return re.sub(REGEX_HTTP_CAMERA_USER_PASS, "user=*&password=*", rtsp_cleaned)


def escape_special_characters(path: str) -> str:
    """Cleans reserved characters to encodings for ffmpeg."""
    if len(path) > 1000:
        return ValueError("Input too long to check")

    try:
        found = re.search(REGEX_RTSP_CAMERA_USER_PASS, path).group(0)[3:-1]
        pw = found[(found.index(":") + 1) :]
        return path.replace(pw, urllib.parse.quote_plus(pw))
    except AttributeError:
        # path does not have user:pass
        return path


def get_ffmpeg_arg_list(arg: Any) -> list:
    """Use arg if list or convert to list format."""
    return arg if isinstance(arg, list) else shlex.split(arg)


def load_labels(path: Optional[str], encoding="utf-8", prefill=91):
    """Loads labels from file (with or without index numbers).
    Args:
      path: path to label file.
      encoding: label file encoding.
    Returns:
      Dictionary mapping indices to labels.
    """
    if path is None:
        return {}

    with open(path, "r", encoding=encoding) as f:
        labels = {index: "unknown" for index in range(prefill)}
        lines = f.readlines()
        if not lines:
            return {}

        if lines[0].split(" ", maxsplit=1)[0].isdigit():
            pairs = [line.split(" ", maxsplit=1) for line in lines]
            labels.update({int(index): label.strip() for index, label in pairs})
        else:
            labels.update({index: line.strip() for index, line in enumerate(lines)})
        return labels


def get_tz_modifiers(tz_name: str) -> Tuple[str, str, int]:
    seconds_offset = (
        datetime.datetime.now(pytz.timezone(tz_name)).utcoffset().total_seconds()
    )
    hours_offset = int(seconds_offset / 60 / 60)
    minutes_offset = int(seconds_offset / 60 - hours_offset * 60)
    hour_modifier = f"{hours_offset} hour"
    minute_modifier = f"{minutes_offset} minute"
    return hour_modifier, minute_modifier, seconds_offset


def to_relative_box(
    width: int, height: int, box: Tuple[int, int, int, int]
) -> Tuple[int, int, int, int]:
    return (
        box[0] / width,  # x
        box[1] / height,  # y
        (box[2] - box[0]) / width,  # w
        (box[3] - box[1]) / height,  # h
    )


def create_mask(frame_shape, mask):
    mask_img = np.zeros(frame_shape, np.uint8)
    mask_img[:] = 255


def update_yaml_from_url(file_path, url):
    parsed_url = urllib.parse.urlparse(url)
    query_string = urllib.parse.parse_qs(parsed_url.query, keep_blank_values=True)

    for key_path_str, new_value_list in query_string.items():
        key_path = key_path_str.split(".")
        for i in range(len(key_path)):
            try:
                index = int(key_path[i])
                key_path[i] = (key_path[i - 1], index)
                key_path.pop(i - 1)
            except ValueError:
                pass

        if len(new_value_list) > 1:
            update_yaml_file(file_path, key_path, new_value_list)
        else:
            value = str(new_value_list[0])

            if value.isnumeric():
                value = int(value)

            update_yaml_file(file_path, key_path, value)


def update_yaml_file(file_path, key_path, new_value):
    yaml = YAML()
    yaml.indent(mapping=2, sequence=4, offset=2)
    with open(file_path, "r") as f:
        data = yaml.load(f)

    data = update_yaml(data, key_path, new_value)
    with open(file_path, "w") as f:
        yaml.dump(data, f)


def update_yaml(data, key_path, new_value):
    temp = data
    for key in key_path[:-1]:
        if isinstance(key, tuple):
            if key[0] not in temp:
                temp[key[0]] = [{}] * max(1, key[1] + 1)
            elif len(temp[key[0]]) <= key[1]:
                temp[key[0]] += [{}] * (key[1] - len(temp[key[0]]) + 1)
            temp = temp[key[0]][key[1]]
        else:
            if key not in temp:
                temp[key] = {}
            temp = temp[key]

    last_key = key_path[-1]
    if new_value == "":
        if isinstance(last_key, tuple):
            del temp[last_key[0]][last_key[1]]
        else:
            del temp[last_key]
    else:
        if isinstance(last_key, tuple):
            if last_key[0] not in temp:
                temp[last_key[0]] = [{}] * max(1, last_key[1] + 1)
            elif len(temp[last_key[0]]) <= last_key[1]:
                temp[last_key[0]] += [{}] * (last_key[1] - len(temp[last_key[0]]) + 1)
            temp[last_key[0]][last_key[1]] = new_value
        else:
            if (
                last_key in temp
                and isinstance(temp[last_key], dict)
                and isinstance(new_value, dict)
            ):
                temp[last_key].update(new_value)
            else:
                temp[last_key] = new_value

    return data


def find_by_key(dictionary, target_key):
    if target_key in dictionary:
        return dictionary[target_key]
    else:
        for value in dictionary.values():
            if isinstance(value, dict):
                result = find_by_key(value, target_key)
                if result is not None:
                    return result
    return None


def save_default_config(location: str) -> None:
    try:
        with open(location, "w") as f:
            f.write(
                """
mqtt:
  enabled: False

cameras:
  name_of_your_camera: # <------ Name the camera
    enabled: True
    ffmpeg:
      inputs:
        - path: rtsp://10.0.10.10:554/rtsp # <----- The stream you want to use for detection
          roles:
            - detect
    detect:
      enabled: False # <---- disable detection until you have a working camera feed
      width: 1280
      height: 720
                    """
            )
    except PermissionError:
        logger.error("Unable to write default config to /config")
        return

    logger.info(
        "Created default config file, see the getting started docs for configuration https://docs.frigate.video/guides/getting_started"
    )


def get_tomorrow_at_time(hour: int) -> datetime.datetime:
    """Returns the datetime of the following day at 2am."""
    try:
        tomorrow = datetime.datetime.now(get_localzone()) + datetime.timedelta(days=1)
    except ZoneInfoNotFoundError:
        tomorrow = datetime.datetime.now(datetime.timezone.utc) + datetime.timedelta(
            days=1
        )
        logger.warning(
            "Using utc for maintenance due to missing or incorrect timezone set"
        )

    return tomorrow.replace(hour=hour, minute=0, second=0).astimezone(
        datetime.timezone.utc
    )


def clear_and_unlink(file: Path, missing_ok: bool = True) -> None:
    """clear file then unlink to avoid space retained by file descriptors."""
    if not missing_ok and not file.exists():
        raise FileNotFoundError()

    # empty contents of file before unlinking https://github.com/blakeblackshear/frigate/issues/4769
    with open(file, "w"):
        pass

    file.unlink(missing_ok=missing_ok)