from moto import mock_aws
import boto3
import pytest
from helpers.dynamodb_helper import create_table_if_not_exists, DDB_TABLE


class TestDynamoDBHelper:
    @pytest.fixture
    def dynamodb(self):
        with mock_aws():
            yield boto3.resource("dynamodb", region_name="ca-central-1")

    @mock_aws
    def test_create_table_if_not_exists(self, dynamodb, aws_credentials):
        # Ensure the table does not exist initially
        client = dynamodb.meta.client
        existing_tables = client.list_tables()["TableNames"]
        assert DDB_TABLE not in existing_tables

        # Create the table
        table = create_table_if_not_exists(dynamodb)
        assert table is not None

        # Verify the table now exists
        existing_tables = client.list_tables()["TableNames"]
        assert DDB_TABLE in existing_tables

        # Attempt to create the table again, should not raise an error
        table = create_table_if_not_exists(dynamodb)
        assert table is not None

    @mock_aws
    def test_log_event(self, dynamodb, aws_credentials):
        table = create_table_if_not_exists(dynamodb)

        table_resource = dynamodb.Table(DDB_TABLE)
        user_id = "user123"
        session_id = "test-session-456"
        data = {"event": "test_event", "value": 26, "float_value": 3.14}
        from helpers.dynamodb_helper import log_event

        log_event(user_id, session_id, data)
        response = table_resource.scan()
        assert response["Count"] == 1
        item = response["Items"][0]
        assert item["PK"] == f"SESSION#{session_id}"
        assert item["data"]["event"] == "test_event"
        from decimal import Decimal

        assert item["data"]["value"] == Decimal(26)
        assert item["data"]["float_value"] == Decimal("3.14")