"""
Optimization infrastructure for continuous improvement of AI agents.

This module implements the kaizen loop for measuring, analyzing, and refining
agent performance over time.
"""

from typing import Dict, Any, List, Optional
from dataclasses import dataclass
from datetime import datetime
import statistics


@dataclass
class PerformanceMetrics:
    """Container for agent performance metrics."""

    timestamp: datetime
    execution_time: float
    success_rate: float
    quality_score: float
    resource_usage: Dict[str, Any]
    metadata: Optional[Dict[str, Any]] = None

    def __post_init__(self):
        if self.metadata is None:
            self.metadata = {}


class OptimizationLoop:
    """Implements the kaizen optimization loop for continuous improvement."""

    def __init__(self, agent_name: str):
        self.agent_name = agent_name
        self.metrics_history: List[PerformanceMetrics] = []
        self.optimization_history: List[Dict[str, Any]] = []

    def record_metrics(self, metrics: PerformanceMetrics) -> None:
        """Record performance metrics for analysis."""
        self.metrics_history.append(metrics)

    def analyze_performance(self, window_size: int = 10) -> Dict[str, Any]:
        """Analyze recent performance trends."""
        if len(self.metrics_history) < window_size:
            window_size = len(self.metrics_history)

        if window_size == 0:
            return {"status": "insufficient_data"}

        recent_metrics = self.metrics_history[-window_size:]

        execution_times = [m.execution_time for m in recent_metrics]
        success_rates = [m.success_rate for m in recent_metrics]
        quality_scores = [m.quality_score for m in recent_metrics]

        analysis = {
            "window_size": window_size,
            "avg_execution_time": statistics.mean(execution_times),
            "avg_success_rate": statistics.mean(success_rates),
            "avg_quality_score": statistics.mean(quality_scores),
            "execution_time_trend": self._calculate_trend(execution_times),
            "success_rate_trend": self._calculate_trend(success_rates),
            "quality_score_trend": self._calculate_trend(quality_scores),
            "analysis_timestamp": datetime.now(),
        }

        return analysis

    def generate_improvement_recommendations(self) -> List[Dict[str, Any]]:
        """Generate recommendations for agent improvement."""
        analysis = self.analyze_performance()

        if analysis.get("status") == "insufficient_data":
            return [
                {"type": "info", "message": "Insufficient data for recommendations"}
            ]

        recommendations = []

        # Performance-based recommendations
        if analysis["avg_execution_time"] > 30.0:  # seconds
            recommendations.append(
                {
                    "type": "performance",
                    "priority": "high",
                    "message": "Consider optimizing execution time",
                    "details": f"Average execution time: {analysis['avg_execution_time']:.2f}s",
                }
            )

        if analysis["avg_success_rate"] < 0.8:
            recommendations.append(
                {
                    "type": "reliability",
                    "priority": "critical",
                    "message": "Success rate below threshold",
                    "details": f"Current success rate: {analysis['avg_success_rate']:.2%}",
                }
            )

        if analysis["avg_quality_score"] < 0.7:
            recommendations.append(
                {
                    "type": "quality",
                    "priority": "medium",
                    "message": "Quality score could be improved",
                    "details": f"Current quality score: {analysis['avg_quality_score']:.2f}",
                }
            )

        # Trend-based recommendations
        if analysis["execution_time_trend"] > 0.1:
            recommendations.append(
                {
                    "type": "trend",
                    "priority": "medium",
                    "message": "Execution time is trending upward",
                    "details": "Consider performance profiling",
                }
            )

        return recommendations

    def _calculate_trend(self, values: List[float]) -> float:
        """Calculate trend direction (-1 to 1, where 1 is strongly upward)."""
        if len(values) < 2:
            return 0.0

        # Simple linear trend calculation
        n = len(values)
        x_sum = sum(range(n))
        y_sum = sum(values)
        xy_sum = sum(i * values[i] for i in range(n))
        x2_sum = sum(i * i for i in range(n))

        if n * x2_sum - x_sum * x_sum == 0:
            return 0.0

        slope = (n * xy_sum - x_sum * y_sum) / (n * x2_sum - x_sum * x_sum)

        # Normalize slope to [-1, 1] range based on value magnitude
        if y_sum == 0:
            return 0.0

        avg_value = y_sum / n
        normalized_slope = slope / abs(avg_value) if avg_value != 0 else 0.0

        return max(-1.0, min(1.0, normalized_slope))

    def get_optimization_report(self) -> Dict[str, Any]:
        """Generate comprehensive optimization report."""
        analysis = self.analyze_performance()
        recommendations = self.generate_improvement_recommendations()

        return {
            "agent_name": self.agent_name,
            "report_timestamp": datetime.now(),
            "performance_analysis": analysis,
            "recommendations": recommendations,
            "metrics_count": len(self.metrics_history),
            "optimization_cycles": len(self.optimization_history),
        }