# -*- coding: utf-8 -*-
"""
Copyright (C) 2024 Xiaomi Corporation.

The ownership and intellectual property rights of Xiaomi Home Assistant
Integration and related Xiaomi cloud service API interface provided under this
license, including source code and object code (collectively, "Licensed Work"),
are owned by Xiaomi. Subject to the terms and conditions of this License, Xiaomi
hereby grants you a personal, limited, non-exclusive, non-transferable,
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to use Licensed Work to develop applications (APP), Web services, and other
forms of software.

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OMISSION, CONTINUITY, RELIABILITY, NON-INFRINGEMENT, MERCHANTABILITY, or
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Common utilities.
"""
import json
from os import path
import random
from typing import Optional
import hashlib
from paho.mqtt.client import MQTTMatcher
import yaml

MIOT_ROOT_PATH: str = path.dirname(path.abspath(__file__))


def gen_absolute_path(relative_path: str) -> str:
    """Generate an absolute path."""
    return path.join(MIOT_ROOT_PATH, relative_path)


def calc_group_id(uid: str, home_id: str) -> str:
    """Calculate the group ID based on a user ID and a home ID."""
    return hashlib.sha1(
        f'{uid}central_service{home_id}'.encode('utf-8')).hexdigest()[:16]


def load_json_file(json_file: str) -> dict:
    """Load a JSON file."""
    with open(json_file, 'r', encoding='utf-8') as f:
        return json.load(f)


def load_yaml_file(yaml_file: str) -> dict:
    """Load a YAML file."""
    with open(yaml_file, 'r', encoding='utf-8') as f:
        return yaml.load(f, Loader=yaml.FullLoader)


def randomize_int(value: int, ratio: float) -> int:
    """Randomize an integer value."""
    return int(value * (1 - ratio + random.random()*2*ratio))


class MIoTMatcher(MQTTMatcher):
    """MIoT Pub/Sub topic matcher."""

    def iter_all_nodes(self) -> any:
        """Return an iterator on all nodes with their paths and contents."""
        def rec(node, path_):
            # pylint: disable=protected-access
            if node._content:
                yield ('/'.join(path_), node._content)
            for part, child in node._children.items():
                yield from rec(child, path_ + [part])
        return rec(self._root, [])

    def get(self, topic: str) -> Optional[any]:
        try:
            return self[topic]
        except KeyError:
            return None