def mangrove_by_country_latest():
    pipeline = [
        {
            "$match": {"year": "2020"},
        },
    ]
    return pipeline


def mangrove_by_country_agg(query):
    pipeline = [
        {"$match": {"country_with_parent": query["country_with_parent"]}},
        {
            "$group": {
                "_id": {"country_with_parent": "$country_with_parent", "year": "$year"},
                "total_pixels": {"$sum": "$total_n_pixels"},
            }
        },
        {
            "$project": {
                "_id": 0,
                "country_with_parent": "$_id.country_with_parent",
                "year": "$_id.year",
                "total_pixels": 1,
            }
        },
        {"$sort": {"year": 1}},
    ]
    return pipeline