# -*- coding: utf-8 -*-

"""
Process apprise.Apprise().details() output for URL builder.
"""

from itertools import chain
from re import compile
from typing import Any, Dict, List, Tuple, Union

from apprise import Apprise

from backend.base.helpers import when_not_none

remove_named_groups = compile(r'(?<=\()\?P<\w+>')
IGNORED_ARGS = {'cto', 'format', 'overflow', 'rto', 'verify'}
CUSTOM_URL_SCHEMA = {
    "service_name": "Custom URL",
    "setup_url": "https://github.com/caronc/apprise#supported-notifications",
    "details": {
        "templates": ("{url}",),
        "tokens": {
            "url": {
                "name": "Apprise URL",
                "type": "string",
                "required": True
            }
        },
        "args": {}
    }
}


def _process_regex(
    regex: Union[Tuple[str, str], None]
) -> Union[Tuple[str, str], None]:
    return when_not_none(
        regex,
        lambda r: (remove_named_groups.sub('', r[0]), r[1])
    )


def _process_list(
    token_name: str,
    token_details: Dict[str, Any],
    all_tokens: Dict[str, Dict[str, Any]]
) -> Dict[str, Any]:
    list_entry = {
        'name': token_details['name'],
        'map_to': token_name,
        'required': token_details['required'],
        'type': 'list',
        'delim': token_details['delim'][0],
        'content': []
    }

    for content in token_details['group']:
        token = all_tokens[content]
        list_entry['content'].append({
            'name': token['name'],
            'required': token['required'],
            'type': token['type'],
            'prefix': token.get('prefix'),
            'regex': _process_regex(token.get('regex'))
        })

    return list_entry


def _process_normal_token(
    token_name: str,
    token_details: Dict[str, Any]
) -> Dict[str, Any]:
    normal_entry = {
        'name': token_details['name'],
        'map_to': token_name,
        'required': token_details['required'],
        'type': token_details['type'].split(':')[0]
    }

    if token_details['type'].startswith('choice'):
        normal_entry.update({
            'options': token_details.get('values'),
            'default': token_details.get('default')
        })

    else:
        normal_entry.update({
            'prefix': token_details.get('prefix'),
            'min': token_details.get('min'),
            'max': token_details.get('max'),
            'regex': _process_regex(token_details.get('regex'))
        })

    return normal_entry


def _process_arg(
    arg_name: str,
    arg_details: Dict[str, Any]
) -> Dict[str, Any]:
    args_entry = {
        'name': arg_details.get('name', arg_name),
        'map_to': arg_name,
        'required': arg_details.get('required', False),
        'type': arg_details['type'].split(':')[0],
    }

    if arg_details['type'].startswith('list'):
        args_entry.update({
            'delim': arg_details['delim'][0],
            'content': []
        })

    elif arg_details['type'].startswith('choice'):
        args_entry.update({
            'options': arg_details['values'],
            'default': arg_details.get('default')
        })

    elif arg_details['type'] == 'bool':
        args_entry.update({
            'default': arg_details['default']
        })

    else:
        args_entry.update({
            'min': arg_details.get('min'),
            'max': arg_details.get('max'),
            'regex': _process_regex(arg_details.get('regex'))
        })

    return args_entry


def _sort_tokens(t: Dict[str, Any]) -> List[int]:
    result = [
        int(not t['required'])
    ]

    if t['name'] == 'Schema':
        result.append(0)

    if t['type'] == 'choice':
        result.append(1)

    elif t['type'] != 'list':
        result.append(2)

    else:
        result.append(3)

    return result


def get_apprise_services() -> List[Dict[str, Any]]:
    """Get a list of all Apprise services, their URL schemas, tokens and
    arguments.

    Returns:
        List[Dict[str, Any]]: The list.
    """
    result: List[Dict[str, Any]] = []

    schemas = Apprise().details()['schemas']
    for schema in chain((CUSTOM_URL_SCHEMA,), schemas):
        entry = {
            'name': str(schema['service_name']),
            'doc_url': schema['setup_url'],
            'details': {
                'templates': schema['details']['templates'],
                'tokens': [],
                'args': []
            }
        }

        # Process lists and tokens they contain first
        handled_tokens = set()
        for token_name, token_details in schema['details']['tokens'].items():
            if not token_details['type'].startswith('list:'):
                continue

            list_entry = _process_list(
                token_name, token_details, schema['details']['tokens']
            )
            entry['details']['tokens'].append(list_entry)
            handled_tokens.add(token_name)
            handled_tokens.update(token_details['group'])

        # Process all other tokens
        entry['details']['tokens'] += [
            _process_normal_token(token_name, token_details)
            for token_name, token_details in schema['details']['tokens'].items()
            if token_name not in handled_tokens
        ]

        # Process args
        entry['details']['args'] += [
            _process_arg(arg_name, arg_details)
            for arg_name, arg_details in schema['details']['args'].items()
            if not (
                arg_details.get('alias_of') is not None
                or arg_name in IGNORED_ARGS
            )
        ]

        # Sort tokens and args
        entry['details']['tokens'].sort(key=_sort_tokens)
        entry['details']['args'].sort(key=_sort_tokens)
        result.append(entry)

    result.sort(key=lambda s: (
        int(s["name"] != "Custom URL"),
        s["name"].lower()
    ))

    return result