"""Aurora Lab 001: ordering semantics, using synthetic data only.

Run with Python 3: python3 event_order_lab.py
Contract: a single sequence scope; SET overwrites remaining quantity.
This is an educational example, not a production feed handler.

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"""

EVENTS = (
    {"sequence": 1, "source_ms": 1000, "received_ms": 1100, "quantity": 10},
    {"sequence": 2, "source_ms": 1001, "received_ms": 1103, "quantity": 4},
    {"sequence": 3, "source_ms": 1002, "received_ms": 1101, "quantity": 7},
)


def replay(order_key):
    """Return the ordered trace; no network, files or trading operations."""
    if order_key not in ("sequence", "received_ms"):
        raise ValueError("Unsupported ordering key")
    return [
        (event["sequence"], event["quantity"])
        for event in sorted(EVENTS, key=lambda event: event[order_key])
    ]


if __name__ == "__main__":
    source = replay("sequence")
    received = replay("received_ms")
    assert source == [(1, 10), (2, 4), (3, 7)]
    assert received == [(1, 10), (3, 7), (2, 4)]
    print("Source sequence:", source, "Final quantity:", source[-1][1])
    print("Receive time:   ", received, "Final quantity:", received[-1][1])
    print("The stated contract makes source sequence authoritative.")