'''
This file is part of JANINE.

JANINE is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

JANINE is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with JANINE.  If not, see <https://www.gnu.org/licenses/>.
'''

import datetime

import aioxmpp

def make_msg(to, body):
    '''
    Wrapper for creating a message object to enqueue or send.
    '''
    msg = aioxmpp.Message(
        type_=aioxmpp.MessageType.CHAT,
        to=to)
    msg.body[None] = body

    return msg

def pad_time_component(c):
    '''
    If we have 12:08, it gets turned into 12:8, so we need to pad
    the components with a leading zero, if there is none.
    '''
    if len(c) != 2:
        return f'0{c}'
    return c

def format_time(time_str):
    '''
    Reformat ISO style time data to a more
    readable format.
    '''
    try:
        date = datetime.datetime.fromisoformat(time_str)
    except ValueError:
        return time_str

    return f'{date.day}.{date.month}.{date.year} {pad_time_component(date.hour)}:{pad_time_component(date.minute)}'

def format_warning(warning):
    '''
    Send a warning to all the recipients
    '''
    # Reformat the message a bit
    effective_time = format_time(warning.effective_from)
    expiry_time = format_time(warning.expires)
    body = f'''*{warning.headline}*
({effective_time} bis {expiry_time})

{warning.description}'''

    if warning.instruction:
        body = f'''{body}

{warning.instruction}'''

    # Smells like script injection, but okay
    body = body.replace('<br>', '\n')
    body = body.replace('<br/>', '\n')
    return body

def find_one(func, array):
    '''
    Utility function

    Return the first element in array for which func returns True.
    '''
    for e in array:
        if func(e):
            return e
    return None

def find_all(func, array):
    '''
    Utility function

    Return all elements in array for which func returns True.
    '''
    return [e for e in array if func(e)]