from collections import Counter

from openstack.connection import Connection


def get_flavor_list(connection: Connection) -> dict:
    servers = list(connection.compute.servers(all_projects=True))
    flavor_ids = [s.flavor["id"] for s in servers if "id" in s.flavor]
    flavor_count = Counter(flavor_ids).most_common()

    flavors = list(flavor_count)

    result = {}
    placeholder = {"name": "—", "count": 0}
    for idx, prefix in [(0, "first"), (1, "second"), (2, "third")]:
        if len(flavors) > idx:
            result[f"{prefix}_common_flavor"] = {"name": flavors[idx][0], "count": flavors[idx][1]}
        else:
            result[f"{prefix}_common_flavor"] = placeholder

    return result