//! Predicate evaluation for WHERE clauses.

use crate::types::{Result, Entity};

/// Predicate evaluator for filtering entities.
pub struct PredicateEvaluator;

impl PredicateEvaluator {
    /// Evaluate WHERE predicate on entity.
    ///
    /// # Arguments
    ///
    /// * `entity` - Entity to test
    /// * `predicate` - SQL WHERE expression
    ///
    /// # Returns
    ///
    /// `true` if entity matches predicate
    ///
    /// # Errors
    ///
    /// Returns `DatabaseError::QueryError` if evaluation fails
    pub fn evaluate(entity: &Entity, predicate: &str) -> Result<bool> {
        todo!("Implement PredicateEvaluator::evaluate")
    }

    /// Evaluate comparison operator.
    ///
    /// # Arguments
    ///
    /// * `left` - Left value
    /// * `op` - Operator (=, !=, <, >, <=, >=)
    /// * `right` - Right value
    ///
    /// # Returns
    ///
    /// Comparison result
    pub fn compare(left: &serde_json::Value, op: &str, right: &serde_json::Value) -> bool {
        todo!("Implement PredicateEvaluator::compare")
    }
}
