<?php

declare(strict_types=1);

/**
 * ML Model Management Usage Examples
 *
 * Comprehensive examples demonstrating all features of the ML Model Management system:
 * 1. Model Registration and Versioning
 * 2. A/B Testing and Model Comparison
 * 3. Real-Time Performance Monitoring
 * 4. Automatic Threshold Optimization
 */

require_once __DIR__ . '/../vendor/autoload.php';

use App\Framework\MachineLearning\ModelManagement\ModelRegistry;
use App\Framework\MachineLearning\ModelManagement\ABTestingService;
use App\Framework\MachineLearning\ModelManagement\ModelPerformanceMonitor;
use App\Framework\MachineLearning\ModelManagement\AutoTuningEngine;
use App\Framework\MachineLearning\ModelManagement\ValueObjects\ModelMetadata;
use App\Framework\MachineLearning\ModelManagement\ValueObjects\ModelType;
use App\Framework\MachineLearning\ModelManagement\ValueObjects\ABTestConfig;
use App\Framework\Core\ValueObjects\Version;
use App\Framework\Core\ValueObjects\Timestamp;
use App\Framework\Core\ValueObjects\Duration;
use App\Framework\DI\Container;

// ============================================================================
// Setup: Get services from DI container
// ============================================================================

$container = require __DIR__ . '/../bootstrap/container.php';

$registry = $container->get(ModelRegistry::class);
$abTesting = $container->get(ABTestingService::class);
$performanceMonitor = $container->get(ModelPerformanceMonitor::class);
$autoTuning = $container->get(AutoTuningEngine::class);

echo "=== ML Model Management System - Usage Examples ===\n\n";

// ============================================================================
// Example 1: Register N+1 Detection Model Versions
// ============================================================================

echo "1. Model Registration and Versioning\n";
echo str_repeat('-', 60) . "\n";

// Register initial version
$n1DetectorV1 = ModelMetadata::forN1Detector(
    version: Version::fromString('1.0.0'),
    configuration: [
        'threshold' => 0.7,
        'window_size' => 100,
        'min_cluster_size' => 3,
    ]
);

$n1DetectorV1 = $n1DetectorV1->withPerformanceMetrics([
    'accuracy' => 0.92,
    'precision' => 0.89,
    'recall' => 0.88,
    'f1_score' => 0.885,
    'false_positive_rate' => 0.11,
]);

$registry->register($n1DetectorV1);
echo "✓ Registered N+1 Detector v1.0.0\n";
echo "  Accuracy: {$n1DetectorV1->getAccuracy()}\n";
echo "  F1-Score: {$n1DetectorV1->getF1Score()}\n\n";

// Register improved version
$n1DetectorV11 = ModelMetadata::forN1Detector(
    version: Version::fromString('1.1.0'),
    configuration: [
        'threshold' => 0.75,  // Optimized threshold
        'window_size' => 100,
        'min_cluster_size' => 3,
    ]
);

$n1DetectorV11 = $n1DetectorV11->withPerformanceMetrics([
    'accuracy' => 0.95,
    'precision' => 0.93,
    'recall' => 0.91,
    'f1_score' => 0.92,
    'false_positive_rate' => 0.07,
]);

$registry->register($n1DetectorV11);
echo "✓ Registered N+1 Detector v1.1.0 (improved)\n";
echo "  Accuracy: {$n1DetectorV11->getAccuracy()}\n";
echo "  F1-Score: {$n1DetectorV11->getF1Score()}\n\n";

// Retrieve and list all versions
$allVersions = $registry->getAll('n1-detector');
echo "Total versions registered: " . count($allVersions) . "\n";

foreach ($allVersions as $model) {
    echo "  - {$model->version->toString()} (Accuracy: {$model->getAccuracy()})\n";
}

echo "\n";

// ============================================================================
// Example 2: A/B Testing - Compare Model Versions
// ============================================================================

echo "2. A/B Testing and Model Comparison\n";
echo str_repeat('-', 60) . "\n";

// Create A/B test configuration
$abTestConfig = ABTestConfig::create(
    modelName: 'n1-detector',
    versionA: Version::fromString('1.0.0'),
    versionB: Version::fromString('1.1.0'),
    trafficSplit: 0.5  // 50/50 split
);

echo "Test Configuration:\n";
echo "  Model: {$abTestConfig->modelName}\n";
echo "  Version A: {$abTestConfig->versionA->toString()} ({$abTestConfig->trafficSplitA * 100}%)\n";
echo "  Version B: {$abTestConfig->versionB->toString()} ({$abTestConfig->getTrafficSplitB() * 100}%)\n";
echo "  Primary Metric: {$abTestConfig->primaryMetric}\n\n";

// Run A/B test
$abTestResult = $abTesting->runTest($abTestConfig);

echo "A/B Test Results:\n";
echo "  Winner: {$abTestResult->winner}\n";
echo "  Statistically Significant: " . ($abTestResult->isStatisticallySignificant ? 'Yes' : 'No') . "\n";
echo "  Primary Metric Improvement: " . sprintf('%+.2f%%', $abTestResult->getPrimaryMetricImprovementPercent()) . "\n";
echo "\nRecommendation:\n";
echo "  {$abTestResult->recommendation}\n\n";

// Metrics comparison
echo "Detailed Metrics Comparison:\n";
$summary = $abTestResult->getMetricsSummary();

echo "  Version A ({$abTestConfig->versionA->toString()}):\n";
echo "    Accuracy:  " . sprintf('%.4f', $summary['version_a']['accuracy']) . "\n";
echo "    Precision: " . sprintf('%.4f', $summary['version_a']['precision']) . "\n";
echo "    Recall:    " . sprintf('%.4f', $summary['version_a']['recall']) . "\n";
echo "    F1-Score:  " . sprintf('%.4f', $summary['version_a']['f1_score']) . "\n\n";

echo "  Version B ({$abTestConfig->versionB->toString()}):\n";
echo "    Accuracy:  " . sprintf('%.4f', $summary['version_b']['accuracy']) . "\n";
echo "    Precision: " . sprintf('%.4f', $summary['version_b']['precision']) . "\n";
echo "    Recall:    " . sprintf('%.4f', $summary['version_b']['recall']) . "\n";
echo "    F1-Score:  " . sprintf('%.4f', $summary['version_b']['f1_score']) . "\n\n";

// Gradual rollout plan
if ($abTestResult->shouldDeployVersionB()) {
    echo "Gradual Rollout Plan:\n";
    $rolloutPlan = $abTesting->generateRolloutPlan(steps: 5);

    foreach ($rolloutPlan as $step => $trafficSplitB) {
        echo sprintf(
            "  Step %d: %.0f%% traffic to v%s\n",
            $step,
            $trafficSplitB * 100,
            $abTestConfig->versionB->toString()
        );
    }
}

echo "\n";

// ============================================================================
// Example 3: Real-Time Performance Monitoring
// ============================================================================

echo "3. Real-Time Performance Monitoring\n";
echo str_repeat('-', 60) . "\n";

// Simulate some predictions
echo "Simulating predictions...\n";

$version = Version::fromString('1.1.0');

// Simulate 20 predictions
for ($i = 0; $i < 20; $i++) {
    $prediction = (bool) ($i % 3 !== 0);  // Predict false every 3rd
    $actual = (bool) ($i % 4 !== 0);      // Actual false every 4th
    $confidence = 0.75 + ($i * 0.01);

    $performanceMonitor->trackPrediction(
        modelName: 'n1-detector',
        version: $version,
        prediction: $prediction,
        actual: $actual,
        confidence: $confidence
    );
}

echo "✓ Tracked 20 predictions\n\n";

// Get current metrics
$currentMetrics = $performanceMonitor->getCurrentMetrics(
    'n1-detector',
    $version,
    Duration::fromHours(1)
);

echo "Current Performance Metrics (last 1 hour):\n";
echo "  Total Predictions: {$currentMetrics['total_predictions']}\n";
echo "  Correct: {$currentMetrics['correct_predictions']}\n";
echo "  Accuracy: " . sprintf('%.4f', $currentMetrics['accuracy']) . "\n";
echo "  Precision: " . sprintf('%.4f', $currentMetrics['precision']) . "\n";
echo "  Recall: " . sprintf('%.4f', $currentMetrics['recall']) . "\n";
echo "  F1-Score: " . sprintf('%.4f', $currentMetrics['f1_score']) . "\n";
echo "  Avg Confidence: " . sprintf('%.4f', $currentMetrics['average_confidence']) . "\n\n";

// Check for performance degradation
$degradationInfo = $performanceMonitor->getPerformanceDegradationInfo(
    'n1-detector',
    $version,
    thresholdPercent: 0.05
);

echo "Performance Degradation Check:\n";
echo "  Has Degraded: " . ($degradationInfo['has_degraded'] ? 'Yes' : 'No') . "\n";
echo "  Baseline Accuracy: " . sprintf('%.4f', $degradationInfo['baseline_accuracy']) . "\n";
echo "  Current Accuracy: " . sprintf('%.4f', $degradationInfo['current_accuracy']) . "\n";
echo "  Degradation: " . sprintf('%.2f%%', $degradationInfo['degradation_percent']) . "\n";
echo "\nRecommendation:\n";
echo "  {$degradationInfo['recommendation']}\n\n";

// Concept drift detection
$hasDrift = $performanceMonitor->detectConceptDrift('n1-detector', $version);
echo "Concept Drift Detected: " . ($hasDrift ? 'Yes' : 'No') . "\n\n";

// ============================================================================
// Example 4: Automatic Threshold Optimization
// ============================================================================

echo "4. Automatic Threshold Optimization\n";
echo str_repeat('-', 60) . "\n";

// Optimize threshold for maximum F1-score
$optimizationResult = $autoTuning->optimizeThreshold(
    modelName: 'n1-detector',
    version: $version,
    metricToOptimize: 'f1_score',
    thresholdRange: [0.5, 0.9],
    step: 0.05,
    timeWindow: Duration::fromHours(1)
);

echo "Threshold Optimization Results:\n";
echo "  Current Threshold: " . sprintf('%.2f', $optimizationResult['current_threshold']) . "\n";
echo "  Optimal Threshold: " . sprintf('%.2f', $optimizationResult['optimal_threshold']) . "\n";
echo "  Current F1-Score: " . sprintf('%.4f', $optimizationResult['current_metric_value']) . "\n";
echo "  Optimal F1-Score: " . sprintf('%.4f', $optimizationResult['optimal_metric_value']) . "\n";
echo "  Improvement: " . sprintf('%+.2f%%', $optimizationResult['improvement_percent']) . "\n";
echo "\nRecommendation:\n";
echo "  {$optimizationResult['recommendation']}\n\n";

// Adaptive threshold adjustment
$adaptiveResult = $autoTuning->adaptiveThresholdAdjustment('n1-detector', $version);

echo "Adaptive Threshold Adjustment:\n";
echo "  Current Threshold: " . sprintf('%.2f', $adaptiveResult['current_threshold']) . "\n";
echo "  Recommended Threshold: " . sprintf('%.2f', $adaptiveResult['recommended_threshold']) . "\n";
echo "  Reason: {$adaptiveResult['adjustment_reason']}\n";
echo "\nExpected Improvement:\n";
echo "  Accuracy: " . sprintf('%+.4f', $adaptiveResult['expected_improvement']['accuracy']) . "\n";
echo "  Precision: " . sprintf('%+.4f', $adaptiveResult['expected_improvement']['precision']) . "\n";
echo "  Recall: " . sprintf('%+.4f', $adaptiveResult['expected_improvement']['recall']) . "\n\n";

// Precision-recall trade-off optimization
$tradeoffResult = $autoTuning->optimizePrecisionRecallTradeoff(
    modelName: 'n1-detector',
    version: $version,
    targetPrecision: 0.95  // Target 95% precision
);

echo "Precision-Recall Trade-off Optimization:\n";
echo "  Target Precision: 0.95\n";
echo "  Optimal Threshold: " . sprintf('%.2f', $tradeoffResult['optimal_threshold']) . "\n";
echo "  Achieved Precision: " . sprintf('%.4f', $tradeoffResult['achieved_precision']) . "\n";
echo "  Achieved Recall: " . sprintf('%.4f', $tradeoffResult['achieved_recall']) . "\n";
echo "  F1-Score: " . sprintf('%.4f', $tradeoffResult['f1_score']) . "\n\n";

// ============================================================================
// Example 5: Version Comparison Across Multiple Models
// ============================================================================

echo "5. Multi-Version Performance Comparison\n";
echo str_repeat('-', 60) . "\n";

$versions = [
    Version::fromString('1.0.0'),
    Version::fromString('1.1.0'),
];

$comparison = $performanceMonitor->compareVersions(
    'n1-detector',
    $versions,
    Duration::fromHours(24)
);

echo "Performance Comparison (last 24 hours):\n\n";

foreach ($comparison as $versionStr => $data) {
    echo "Version {$versionStr}:\n";
    echo "  Environment: " . ($data['environment'] ?? 'N/A') . "\n";
    echo "  Deployed: " . ($data['deployed_at'] ?? 'Not deployed') . "\n";
    echo "  Current Accuracy: " . sprintf('%.4f', $data['current_metrics']['accuracy']) . "\n";
    echo "  Total Predictions: {$data['current_metrics']['total_predictions']}\n";
    echo "\n";
}

// ============================================================================
// Example 6: Production Deployment Workflow
// ============================================================================

echo "6. Production Deployment Workflow\n";
echo str_repeat('-', 60) . "\n";

// Deploy winning version to production
if ($abTestResult->shouldDeployVersionB()) {
    $winningVersion = $abTestResult->getWinningVersion();

    echo "Deploying version {$winningVersion->toString()} to production...\n";

    // Update model with deployment info
    $updatedMetadata = $n1DetectorV11->withDeployment(
        environment: 'production',
        deployedAt: Timestamp::now()
    );

    $registry->update($updatedMetadata);

    echo "✓ Successfully deployed to production\n";
    echo "  Environment: {$updatedMetadata->environment}\n";
    echo "  Deployed At: {$updatedMetadata->deployedAt->format('Y-m-d H:i:s')}\n";
    echo "\n";
}

// Get all production models
$productionModels = $registry->getProductionModels();
echo "Active Production Models: " . count($productionModels) . "\n";

foreach ($productionModels as $model) {
    echo "  - {$model->modelName} v{$model->version->toString()}\n";
    echo "    Type: {$model->modelType->value}\n";
    echo "    Accuracy: {$model->getAccuracy()}\n";
    echo "    Deployed: {$model->deployedAt->format('Y-m-d H:i:s')}\n\n";
}

echo "\n=== Examples Completed Successfully ===\n";