"""Promo Player logic."""

import random
import string

from oto import response

from promo_player.models import promo_player
from promo_player.models import promo_player_track


def generate_code():
    """Generate a unique 20 characters alphanumeric string.

    Returns:
        string: the generated string.
    """
    return ''.join(
        random.SystemRandom().choice(
            string.ascii_letters + string.digits) for _ in range(20))


def create(data):
    """Create a new promo player.

    Args:
        data (dict): the data from which to create the promo player.

    Returns:
        response.Response: containing the created promo player dict.
    """
    product_id = data.get('product_id', None)

    if product_id:
        active_promo_player_response = get_active_by_product_id(product_id)

        if active_promo_player_response:
            active_promo_player = active_promo_player_response.message
            update_data = {
                'promo_player_id': active_promo_player['promo_player_id'],
                'product_id': data['product_id'],
                'active': False
            }
            update(update_data)

    data['code'] = generate_code()
    return promo_player.create(data)


def get_active_by_product_id(product_id):
    """Get the active promo player for a product.

    Args:
        product_id (int): the product ID.

    Returns:
        response.Response: containing the promo player dict.
    """
    promo_player_response = promo_player.get_active_by_product_id(product_id)
    return get_tracks_for_promo_player(promo_player_response)


def update(data):
    """Update a promo player.

    Args:
        data (dict): the data from which to update the promo player.

    Returns:
        response.Response: containing the updated promo player dict.
    """
    return promo_player.update(data)


def get_by_product_id(product_id):
    """Get all the promo players associated with the specified product.

    Args:
        product_id (int): the product ID.

    Returns:
        response.Response: containing a dict with the list of promo players.
    """
    return promo_player.get_by_product_id(product_id)


def get_by_vendor_id(vendor_id):
    """Get all the promo players associated with the specified vendor.

    Args:
        vendor_id (int): the vendor ID.

    Returns:
        response.Response: containing a dict with the list of promo players.
    """
    return promo_player.get_by_vendor_id(vendor_id)


def get_by_code(code):
    """Get a promo player by code.

    Args:
        code (string): the promo player unique code.

    Returns:
        response.Response: containing the promo player dict.
    """
    promo_player_response = promo_player.get_by_code(code)
    return get_tracks_for_promo_player(promo_player_response)


def delete_by_product_id(product_id):
    """Delete all the promo players associated with the specified product.

    Args:
        product_id (int): the product ID.

    Returns:
        response.Response: containing a dict with the list of deleted items.
    """
    return promo_player.delete_by_product_id(product_id)


def get_tracks_for_promo_player(promo_player_response):
    """Get the promo player tracks for a promo player.

    Args:
        promo_player_response (response.Response): containing the promo player.
    Returns:
        response.Response: containing the promo player with the tracks.
    """
    if not promo_player_response:
        return promo_player_response

    promo_player = promo_player_response.message

    tracks_response = promo_player_track.get_by_promo_player_id(
        promo_player['promo_player_id'])

    if not tracks_response:
        return tracks_response

    tracks = tracks_response.message['items']
    promo_player['tracks'] = tracks

    return response.Response(promo_player)