"""Messages."""

import gettext
import json

import config


def create_message_string(message, data):
    """Create string message to go to SNS endpoints.

    Based on: https://github.com/theorchard/profile-users-scripts/blob/master/src/ApiCalls/Sns.js#L9
    And: https://docs.aws.amazon.com/sns/latest/dg/sns-send-custom-platform-specific-payloads-mobile-devices.html

    Args:
        message (str): contents of notification
        data (dict): metadata about notification

    Returns:
        str: formatted message for Google and Apple notifications
    """  # noqa:E501
    android_data = dict(data, body=message)
    android_message = {
        'data': android_data
    }
    ios_message = {
        'aps': {
            'alert': {
                'body': message
            },
            'sound': 'default'
        },
        'body': data
    }
    sns_message = {
        'GCM': json.dumps(android_message),
        'APNS': json.dumps(ios_message),
        'default': message
    }
    return json.dumps(sns_message)


def get_translations(identity_lc):
    """Get translations based on user locale."""
    user_locale = config.DEFAULT_LANGUAGE
    if identity_lc:
        user_locale = identity_lc.replace('-', '_') if identity_lc.startswith('zh') else identity_lc[:2]   # noqa:E501
    translation = gettext.translation(
        config.I18N_DOMAIN,
        localedir=config.I18N_FOLDER_NAME,
        languages=[user_locale], fallback=True)
    return translation.gettext


def get_platform_and_follower_type(platform_name):
    """Get platform formatted name and type of follower."""
    for platform, follower_type in config.SOCIAL_PLATFORM_MAPPING.items():
        if platform_name == platform.lower():
            return platform, follower_type
    raise Exception(f'Unknown platform {platform_name}')