from typing import List
from million.model.message import Message
from million.model.participant import Participant


def count_participations(messages: List[Message], participants: List[Participant]):
    """
    Count the number of messages sent by each participant
    """
    participations = {}
    for participant in participants:
        participations[participant.name] = 0

    for message in messages:
        if message.sender_name not in participations:
            participations[message.sender_name] = 1
        else:
            participations[message.sender_name] += 1

    ordered_participations = sorted(
        participations.items(), key=lambda x: x[1], reverse=True)
    return [{"name": v[0], "participations": v[1]} for v in ordered_participations]