from aws_lambda_powertools import Logger
from aws_lambda_powertools.utilities.data_classes import (
    EventBridgeEvent,
    event_source,
)
from aws_lambda_powertools.utilities.typing import LambdaContext
from layercake.dateutils import now
from layercake.dynamodb import (
    DynamoDBPersistenceLayer,
    KeyPair,
    SortKey,
    TransactItems,
)

from boto3clients import dynamodb_client
from conf import ORDER_TABLE, USER_TABLE

logger = Logger(__name__)
user_layer = DynamoDBPersistenceLayer(USER_TABLE, dynamodb_client)
order_layer = DynamoDBPersistenceLayer(ORDER_TABLE, dynamodb_client)


@event_source(data_class=EventBridgeEvent)
@logger.inject_lambda_context
def lambda_handler(event: EventBridgeEvent, context: LambdaContext) -> bool:
    new_image = event.detail['new_image']
    now_ = now()
    ids = user_layer.collect.get_items(
        KeyPair(
            pk='cnpj',
            sk=SortKey(new_image['cnpj'], path_spec='user_id'),
            rename_key='org_id',
        )
        + KeyPair(
            pk='email',
            sk=SortKey(new_image['email'], path_spec='user_id'),
            rename_key='user_id',
        ),
        flatten_top=False,
    )

    # Sometimes, a DynamoDB insertion may take longer to complete,
    # so an exception is raised to trigger a retry.
    if len(ids) < 2:
        raise ValueError('IDs not found.')

    transact = TransactItems(order_layer.table_name)
    transact.update(
        key=KeyPair(new_image['id'], '0'),
        update_expr='SET metadata__tenant_id = :org_id, update_date = :update_date',
        expr_attr_values={
            ':org_id': {ids['org_id']},
            ':update_date': now_,
        },
    )
    transact.put(
        item={
            'id': new_image['id'],
            'sk': 'metadata#tenant',
            'org_id': ids['org_id'],
            'create_date': now_,
        }
    )

    for k, v in ids.items():
        transact.put(
            item={
                'id': new_image['id'],
                'sk': 'rel#%s' % k.removesuffix('_id').upper(),
                'create_date': now_,
                k: v,
            }
        )

    order_layer.transact_write_items(transact)
    return True