//! Metrics aggregation for combining multiple evaluation measures
//!
//! This module provides stub implementations for metrics aggregation methods.
//! Full implementations are planned for future releases.

use sklears_core::error::{Result as SklResult, SklearsError};

/// Metrics aggregator (stub implementation)
#[derive(Debug, Clone)]
pub struct MetricsAggregator;

impl MetricsAggregator {
    /// aggregate_metrics
    pub fn aggregate_metrics(_metrics: &[f64], _weights: Option<&[f64]>) -> SklResult<f64> {
        Err(SklearsError::NotImplemented(
            "MetricsAggregator::aggregate_metrics is not yet implemented".to_string(),
        ))
    }
}

/// Weighted averaging (stub implementation)
#[derive(Debug, Clone)]
pub struct WeightedAveraging;

impl WeightedAveraging {
    /// weighted_average
    pub fn weighted_average(_values: &[f64], _weights: &[f64]) -> SklResult<f64> {
        Err(SklearsError::NotImplemented(
            "WeightedAveraging::weighted_average is not yet implemented".to_string(),
        ))
    }
}

/// Rank aggregation methods (stub implementation)
#[derive(Debug, Clone)]
pub struct RankAggregation;

impl RankAggregation {
    /// borda_count
    pub fn borda_count(_rankings: &[Vec<usize>]) -> SklResult<Vec<usize>> {
        Err(SklearsError::NotImplemented(
            "RankAggregation::borda_count is not yet implemented".to_string(),
        ))
    }

    /// kemeny_optimal
    pub fn kemeny_optimal(_rankings: &[Vec<usize>]) -> SklResult<Vec<usize>> {
        Err(SklearsError::NotImplemented(
            "RankAggregation::kemeny_optimal is not yet implemented".to_string(),
        ))
    }
}

/// Consensus metrics (stub implementation)
#[derive(Debug, Clone)]
pub struct ConsensusMetrics;

impl ConsensusMetrics {
    /// compute_consensus
    pub fn compute_consensus(_rankings: &[Vec<usize>]) -> SklResult<f64> {
        Err(SklearsError::NotImplemented(
            "ConsensusMetrics::compute_consensus is not yet implemented".to_string(),
        ))
    }
}

/// Multi-criteria evaluation (stub implementation)
#[derive(Debug, Clone)]
pub struct MultiCriteriaEvaluation;

impl MultiCriteriaEvaluation {
    /// evaluate_multi_criteria
    pub fn evaluate_multi_criteria(
        _criteria_scores: &[Vec<f64>],
        _criteria_weights: &[f64],
    ) -> SklResult<Vec<f64>> {
        Err(SklearsError::NotImplemented(
            "MultiCriteriaEvaluation::evaluate_multi_criteria is not yet implemented".to_string(),
        ))
    }
}
