oximedia-recommend 0.1.8

//! Personalization engine.

use crate::error::RecommendResult;
use crate::{Recommendation, RecommendationRequest};

/// Personalization engine
pub struct PersonalizationEngine {
    /// Context processor
    context_processor: super::context::ContextProcessor,
}

impl PersonalizationEngine {
    /// Create a new personalization engine
    #[must_use]
    pub fn new() -> Self {
        Self {
            context_processor: super::context::ContextProcessor::new(),
        }
    }

    /// Get personalized recommendations
    ///
    /// # Errors
    ///
    /// Returns an error if recommendation generation fails
    pub fn recommend(
        &self,
        _request: &RecommendationRequest,
    ) -> RecommendResult<Vec<Recommendation>> {
        // In a real implementation, this would use user profile, context,
        // and multiple recommendation strategies to generate personalized results
        Ok(Vec::new())
    }

    /// Adjust recommendations based on context
    #[must_use]
    pub fn adjust_for_context(
        &self,
        mut recommendations: Vec<Recommendation>,
        context: &super::context::UserContext,
    ) -> Vec<Recommendation> {
        // Apply context-aware adjustments
        for rec in &mut recommendations {
            let adjustment = self.context_processor.calculate_context_boost(context);
            rec.score *= adjustment;
        }

        // Re-sort by adjusted scores
        recommendations.sort_by(|a, b| {
            b.score
                .partial_cmp(&a.score)
                .unwrap_or(std::cmp::Ordering::Equal)
        });

        // Re-assign ranks
        for (idx, rec) in recommendations.iter_mut().enumerate() {
            rec.rank = idx + 1;
        }

        recommendations
    }
}

impl Default for PersonalizationEngine {
    fn default() -> Self {
        Self::new()
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_personalization_engine_creation() {
        let engine = PersonalizationEngine::new();
        assert!(std::mem::size_of_val(&engine) > 0);
    }
}