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,
)

from boto3clients import dynamodb_client
from config 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.collection.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 the function executes before the user insertion completes,
    # so an exception is raised to trigger a retry.
    if len(ids) < 2:
        raise ValueError('IDs not found.')

    with order_layer.transact_writer() as transact:
        transact.update(
            key=KeyPair(new_image['id'], '0'),
            update_expr='SET metadata__tenant_id = :tenant_id, \
                             metadata__related_ids = :related_ids, \
                             update_date = :update_date',
            expr_attr_values={
                ':tenant_id': ids['org_id'],
                ':related_ids': set(ids.values()),
                ':update_date': now_,
            },
        )
        transact.put(
            item={
                'id': new_image['id'],
                'sk': 'metadata#tenant',
                'tenant_id': f'ORG#{ids["org_id"]}',
                'create_date': now_,
            }
        )

        for k, v in ids.items():
            kind = k.removesuffix('_id')
            transact.put(
                item={
                    'id': new_image['id'],
                    'sk': f'related_ids#{kind}',  # e.g. related_ids#user
                    'create_date': now_,
                    k: v,
                }
            )

    return True