from prometheus_client import Counter, Gauge, Histogram

SEND_TOTAL = Counter(
    "sms_send_total",
    "Provider send outcomes",
    ("provider", "send_status"),
)
PROVIDER_LATENCY = Histogram(
    "sms_provider_request_duration_seconds",
    "Provider request latency",
    ("provider",),
)
UNCERTAIN_TOTAL = Counter(
    "sms_uncertain_total",
    "Ambiguous provider outcomes",
    ("provider",),
)
CALLBACK_TOTAL = Counter(
    "sms_callback_total",
    "Callback items",
    ("provider", "result"),
)
CALLBACK_LAG = Histogram(
    "sms_callback_lag_seconds",
    "Callback status-to-receipt lag",
    ("provider", "status"),
)
PENDING_AGE = Gauge(
    "sms_pending_oldest_age_seconds",
    "Age of oldest pending message",
)
JOURNAL_ROWS = Gauge(
    "sms_journal_rows",
    "Outbound journal row count",
)
SETTINGS_VALID = Gauge(
    "sms_settings_valid",
    "Whether cached technical settings are valid",
)