import pytest

from core.domain.errors import CDRProcessingError, FailureReason
from core.domain.validation import parse_raw_cdr


def valid_payload() -> dict:
    return {
        "raw_id": "raw-001",
        "src_ip": "10.240.12.1",
        "device_id": "310410998877665",
        "caller_num": "0019875551234",
        "svc": "4G_DATA",
        "up_bytes": 1048576,
        "down_bytes": 4194304,
        "rat": 6,
        "lac": "4021",
        "ci": "8812",
        "epoch_start": 1726070000,
        "epoch_end": 1726070300,
    }

def test_missing_required_field() -> None:
    payload = valid_payload()
    del payload["caller_num"]

    with pytest.raises(CDRProcessingError) as exc_info:
        parse_raw_cdr(payload)

    error = exc_info.value

    assert error.reason == FailureReason.MISSING_REQUIRED_FIELD
    assert error.failed_field == "caller_num"

def test_invalid_rat() -> None:
    payload = valid_payload()
    payload["rat"] = 99

    with pytest.raises(CDRProcessingError) as exc_info:
        parse_raw_cdr(payload)

    error = exc_info.value

    assert error.reason == FailureReason.INVALID_RAT_VALUE
    assert error.failed_field == "rat"

def test_epoch_start_after_end_is_invalid() -> None:
    payload = valid_payload()

    payload["epoch_start"] = 200
    payload["epoch_end"] = 100

    with pytest.raises(CDRProcessingError) as exc_info:
        parse_raw_cdr(payload)

    error = exc_info.value

    assert error.reason == FailureReason.INVALID_EPOCH

def test_negative_uploaded_bytes_is_invalid() -> None:
    payload = valid_payload()

    payload["up_bytes"] = -1

    with pytest.raises(CDRProcessingError) as exc_info:
        parse_raw_cdr(payload)

    error = exc_info.value

    assert error.reason == FailureReason.NORMALIZATION_ERROR
    assert error.failed_field == "up_bytes"