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use serde::{Deserialize, Serialize};
use crate::errors::DataProfilerError;
/// The kind of a semantic hint, used for diagnostics and binding evidence.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, schemars::JsonSchema)]
#[serde(rename_all = "snake_case")]
pub enum SemanticHintKind {
/// A [`SemanticHints::positive_columns`] entry.
Positive,
/// An [`SemanticHints::identifier_columns`] entry.
Identifier,
/// A [`SemanticHints::temporal_columns`] entry.
Temporal,
}
impl SemanticHintKind {
/// The public configuration field name that carries this hint kind.
pub fn field_name(self) -> &'static str {
match self {
Self::Positive => "positive_columns",
Self::Identifier => "identifier_columns",
Self::Temporal => "temporal_columns",
}
}
}
/// Per-column evidence of whether a semantic hint actually bound to any value.
///
/// A hint expresses user domain knowledge about a column; this records how much
/// of the column that knowledge matched. `matched_values` counts the values of
/// the kind the hint expects (numeric for `positive`, date-parseable for
/// `temporal`, every non-null value for `identifier`, which coerces the column).
///
/// `exact` distinguishes a full-data count from a sampled one: a hint that
/// matched nothing (`matched_values == 0`) is only *proven* inert when the count
/// covers every row. A sampled zero is recorded but never treated as an error,
/// because absence in a sample is not proof of absence in the data.
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, schemars::JsonSchema)]
pub struct SemanticHintBinding {
/// The hinted column this evidence is for.
pub column: String,
/// Which hint list named the column.
pub kind: SemanticHintKind,
/// Non-null values considered.
pub checked_values: usize,
/// Values that matched the hint's expected kind.
pub matched_values: usize,
/// Whether the counts cover every row (`true`) or a sample (`false`).
pub exact: bool,
}
impl SemanticHintBinding {
/// Whether this hint is *proven* inert: it was assessed over the full data
/// (`exact`), had values to consider (`checked_values > 0`), yet matched
/// none of them.
pub fn is_proven_inert(&self) -> bool {
self.exact && self.checked_values > 0 && self.matched_values == 0
}
}
/// User-supplied semantic hints that affect profiling and quality metrics.
#[derive(Debug, Clone, Default, PartialEq, Eq)]
#[non_exhaustive]
pub struct SemanticHints {
pub positive_columns: Vec<String>,
pub identifier_columns: Vec<String>,
pub temporal_columns: Vec<String>,
}
impl SemanticHints {
pub fn new(positive_columns: Vec<String>, identifier_columns: Vec<String>) -> Self {
Self {
positive_columns,
identifier_columns,
temporal_columns: Vec::new(),
}
}
pub fn with_temporal_columns(mut self, temporal_columns: Vec<String>) -> Self {
self.temporal_columns = temporal_columns;
self
}
pub fn is_empty(&self) -> bool {
self.positive_columns.is_empty()
&& self.identifier_columns.is_empty()
&& self.temporal_columns.is_empty()
}
pub fn is_identifier_column(&self, column_name: &str) -> bool {
self.identifier_columns
.iter()
.any(|candidate| candidate == column_name)
}
pub fn is_positive_column(&self, column_name: &str) -> bool {
self.positive_columns
.iter()
.any(|candidate| candidate == column_name)
}
pub fn is_temporal_column(&self, column_name: &str) -> bool {
self.temporal_columns
.iter()
.any(|candidate| candidate == column_name)
}
/// Every `(kind, column_name)` pair across all three hint lists.
pub fn iter(&self) -> impl Iterator<Item = (SemanticHintKind, &str)> {
let positive = self
.positive_columns
.iter()
.map(|c| (SemanticHintKind::Positive, c.as_str()));
let identifier = self
.identifier_columns
.iter()
.map(|c| (SemanticHintKind::Identifier, c.as_str()));
let temporal = self
.temporal_columns
.iter()
.map(|c| (SemanticHintKind::Temporal, c.as_str()));
positive.chain(identifier).chain(temporal)
}
/// Fail loudly when a hint names a column that is not in the schema.
///
/// A hint is the user's chosen alternative to overconfident inference, so a
/// hint that cannot bind must not vanish: a typo'd or stale column name is a
/// mistake the profiler should surface, not silently discard.
pub fn validate_names(&self, column_names: &[&str]) -> Result<(), DataProfilerError> {
let mut unknown: Vec<(SemanticHintKind, &str)> = self
.iter()
.filter(|(_, name)| !column_names.contains(name))
.collect();
if unknown.is_empty() {
return Ok(());
}
// Stable, readable ordering regardless of hint-list order.
unknown.sort_unstable_by(|a, b| a.1.cmp(b.1).then(a.0.field_name().cmp(b.0.field_name())));
let details = unknown
.iter()
.map(|(kind, name)| format!("'{}' ({})", name, kind.field_name()))
.collect::<Vec<_>>()
.join(", ");
let mut available: Vec<&str> = column_names.to_vec();
available.sort_unstable();
let available = available
.iter()
.map(|c| format!("'{c}'"))
.collect::<Vec<_>>()
.join(", ");
Err(DataProfilerError::InvalidSemanticHint {
message: format!("semantic hint names not found in the data: {details}"),
suggestion: format!(
"Available columns: [{available}]. Check spelling and case, or remove the hint."
),
})
}
/// Reject value-driven hints when the Quality metric pack did not run.
///
/// Positive and temporal hints only affect quality calculators. Accepting
/// them without a quality assessment would make the configuration look
/// effective while producing neither metrics nor binding evidence.
pub fn validate_quality_usage(&self, quality_computed: bool) -> Result<(), DataProfilerError> {
if quality_computed
|| (self.positive_columns.is_empty() && self.temporal_columns.is_empty())
{
return Ok(());
}
Err(DataProfilerError::InvalidSemanticHint {
message: "positive_columns and temporal_columns require the Quality metric pack"
.to_string(),
suggestion: "Include MetricPack::Quality (\"quality\" in Python), or remove the value-driven hint. Identifier hints remain usable without quality because they affect column typing."
.to_string(),
})
}
/// Fail loudly when a hint names a real column but bound to nothing.
///
/// Only bindings that were assessed over the full data
/// ([`SemanticHintBinding::is_proven_inert`]) raise; sampled evidence is
/// carried in the report but never treated as proof of absence.
pub fn validate_bindings(
&self,
bindings: &[SemanticHintBinding],
) -> Result<(), DataProfilerError> {
let inert: Vec<&SemanticHintBinding> =
bindings.iter().filter(|b| b.is_proven_inert()).collect();
if inert.is_empty() {
return Ok(());
}
let details = inert
.iter()
.map(|b| {
format!(
"'{}' ({}): 0 of {} value(s) matched",
b.column,
b.kind.field_name(),
b.checked_values
)
})
.collect::<Vec<_>>()
.join("; ");
Err(DataProfilerError::InvalidSemanticHint {
message: format!("semantic hint(s) bound to no matching value: {details}"),
suggestion: "positive_columns need numeric values; temporal_columns need date values. \
Fix the column choice or remove the hint."
.to_string(),
})
}
}