from prometheus_client import Counter, Histogram
from nl2sql.prom import REGISTRY


# -----------------------------------------------------------------------------
#  Stage-level metrics
# -----------------------------------------------------------------------------
stage_duration_ms = Histogram(
    "stage_duration_ms",
    "Duration (ms) of each pipeline stage",
    ["stage"],  # e.g. detector|planner|generator|safety|verifier
    buckets=(1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000),
    registry=REGISTRY,
)

# -----------------------------------------------------------------------------
#  Safety stage metrics
# -----------------------------------------------------------------------------
safety_blocks_total = Counter(
    "safety_blocks_total",
    "Count of blocked SQL queries by safety checks",
    [
        "reason"
    ],  # e.g. forbidden_keyword, multiple_statements, non_readonly, explain_not_allowed
    registry=REGISTRY,
)

safety_checks_total = Counter(
    "safety_checks_total",
    "Total SQL queries checked by safety",
    ["ok"],  # "true" or "false"
    registry=REGISTRY,
)

# -----------------------------------------------------------------------------
#  Verifier stage metrics
# -----------------------------------------------------------------------------
verifier_checks_total = Counter(
    "verifier_checks_total",
    "Count of verifier checks (success/failure)",
    ["ok"],  # "true" | "false"
    registry=REGISTRY,
)

verifier_failures_total = Counter(
    "verifier_failures_total",
    "Count of verifier failures by type",
    ["reason"],  # e.g. parse_error, semantic_check_error, adapter_failure
    registry=REGISTRY,
)

# -----------------------------------------------------------------------------
#  Pipeline-level metrics
# -----------------------------------------------------------------------------
pipeline_runs_total = Counter(
    "pipeline_runs_total",
    "Total number of full pipeline runs",
    ["status"],  # ok | error | ambiguous
    registry=REGISTRY,
)