#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import hashlib
import json
import logging
import os
from datetime import datetime, timedelta
from enum import IntEnum, unique
from functools import lru_cache
from io import BufferedIOBase
from pathlib import Path
from typing import Any, Dict, List, Optional, Set, Tuple, Union
from urllib.parse import urljoin, urlparse

import pkg_resources
import requests
from har2tree import CrawledTree, HostNode, URLNode
from publicsuffix2 import PublicSuffixList, fetch  # type: ignore
from pytaxonomies import Taxonomies
from requests.exceptions import HTTPError

from .default import get_homedir, safe_create_dir, get_config

logger = logging.getLogger('Lookyloo - Helpers')


@unique
class CaptureStatus(IntEnum):
    UNKNOWN = -1
    QUEUED = 0
    DONE = 1
    ONGOING = 2


# This method is used in json.dump or json.dumps calls as the default parameter:
# json.dumps(..., default=dump_to_json)
def serialize_to_json(obj: Union[Set]) -> Union[List]:
    if isinstance(obj, set):
        return list(obj)


def get_resources_hashes(har2tree_container: Union[CrawledTree, HostNode, URLNode]) -> Set[str]:
    if isinstance(har2tree_container, CrawledTree):
        urlnodes = har2tree_container.root_hartree.url_tree.traverse()
    elif isinstance(har2tree_container, HostNode):
        urlnodes = har2tree_container.urls
    elif isinstance(har2tree_container, URLNode):
        urlnodes = [har2tree_container]
    else:
        raise Exception(f'har2tree_container cannot be {type(har2tree_container)}')
    all_ressources_hashes: Set[str] = set()
    for urlnode in urlnodes:
        if hasattr(urlnode, 'resources_hashes'):
            all_ressources_hashes.update(urlnode.resources_hashes)
    return all_ressources_hashes


@lru_cache(64)
def get_taxonomies():
    return Taxonomies()


@lru_cache(64)
def get_public_suffix_list():
    """Initialize Public Suffix List"""
    try:
        psl_file = fetch()
        psl = PublicSuffixList(psl_file=psl_file)
    except Exception:
        psl = PublicSuffixList()
    return psl


@lru_cache(64)
def get_captures_dir() -> Path:
    capture_dir = get_homedir() / 'scraped'
    safe_create_dir(capture_dir)
    return capture_dir


@lru_cache(64)
def get_email_template() -> str:
    with (get_homedir() / 'config' / 'email.tmpl').open() as f:
        return f.read()


def get_user_agents(directory: str='user_agents') -> Dict[str, Any]:
    ua_files_path = sorted((get_homedir() / directory).glob('**/*.json'), reverse=True)
    with ua_files_path[0].open() as f:
        return json.load(f)


def load_known_content(directory: str='known_content') -> Dict[str, Dict[str, Any]]:
    to_return: Dict[str, Dict[str, Any]] = {}
    for known_content_file in (get_homedir() / directory).glob('*.json'):
        with known_content_file.open() as f:
            to_return[known_content_file.stem] = json.load(f)
    return to_return


def load_cookies(cookie_pseudofile: Optional[Union[BufferedIOBase, str]]=None) -> List[Dict[str, Union[str, bool]]]:
    cookies: List[Dict[str, Union[str, bool]]]
    if cookie_pseudofile:
        if isinstance(cookie_pseudofile, str):
            try:
                cookies = json.loads(cookie_pseudofile)
            except json.decoder.JSONDecodeError:
                logger.warning(f'Unable to load json content: {cookie_pseudofile}')
                return []
        else:
            cookies = json.load(cookie_pseudofile)
    else:
        if not (get_homedir() / 'cookies.json').exists():
            return []

        with (get_homedir() / 'cookies.json').open() as f:
            cookies = json.load(f)
    to_return: List[Dict[str, Union[str, bool]]] = []
    try:
        for cookie in cookies:
            to_add: Dict[str, Union[str, bool]]
            if 'Host raw' in cookie:
                # Cookie export format for Cookie Quick Manager
                u = urlparse(cookie['Host raw']).netloc.split(':', 1)[0]  # type: ignore
                to_add = {'path': cookie['Path raw'],
                          'name': cookie['Name raw'],
                          'httpOnly': cookie['HTTP only raw'] == 'true',
                          'secure': cookie['Send for'] == 'Encrypted connections only',
                          'expires': (datetime.now() + timedelta(days=10)).strftime('%Y-%m-%dT%H:%M:%S') + 'Z',
                          'domain': u,
                          'value': cookie['Content raw']
                          }
            else:
                # Cookie from lookyloo/splash
                to_add = cookie
            to_return.append(to_add)
    except Exception as e:
        print(f'Unable to load the cookie file: {e}')
    return to_return


def uniq_domains(uniq_urls):
    domains = set()
    for url in uniq_urls:
        splitted = urlparse(url)
        domains.add(splitted.hostname)
    return domains


@lru_cache(64)
def get_useragent_for_requests():
    version = pkg_resources.get_distribution('lookyloo').version
    return f'Lookyloo / {version}'


@lru_cache(64)
def get_splash_url() -> str:
    if os.environ.get('SPLASH_URL_DOCKER'):
        # In order to have a working default for the docker image, it is easier to use an environment variable
        return os.environ['SPLASH_URL_DOCKER']
    else:
        return get_config('generic', 'splash_url')


def splash_status() -> Tuple[bool, str]:
    try:
        splash_status = requests.get(urljoin(get_splash_url(), '_ping'))
        splash_status.raise_for_status()
        json_status = splash_status.json()
        if json_status['status'] == 'ok':
            return True, 'Splash is up'
        else:
            return False, str(json_status)
    except HTTPError as http_err:
        return False, f'HTTP error occurred: {http_err}'
    except Exception as err:
        return False, f'Other error occurred: {err}'


def get_cache_directory(root: Path, identifier: str, namespace: Optional[str] = None) -> Path:
    m = hashlib.md5()
    m.update(identifier.encode())
    digest = m.hexdigest()
    if namespace:
        root = root / namespace
    return root / digest[0] / digest[1] / digest[2] / digest