"""
Enhanced API Endpoints

Additional API routes for:
- Enhanced predictions with caching
- Real-time data streaming
- User notifications
- Advanced statistics
- Match recommendations
"""

from flask import Blueprint, jsonify, request
from datetime import datetime, timedelta
from typing import Dict, List, Optional

# Import our new modules
from src.cache_system import (
    cache_prediction, cache_fixtures, 
    prediction_cache, get_cache_stats,
    invalidate_prediction_cache
)
from src.realtime_updates import (
    event_emitter, live_tracker, odds_tracker, 
    alert_manager, get_event_stream, emit_prediction
)
from src.notification_service import (
    notification_service, get_user_notifications,
    get_unread_count, notify_sure_win
)


# Create blueprint
enhanced_api = Blueprint('enhanced_api', __name__, url_prefix='/api/v4')


# ============================================================
# Enhanced Prediction Endpoints
# ============================================================

@enhanced_api.route('/predict/enhanced')
def enhanced_prediction():
    """Enhanced prediction with caching and full analysis"""
    home = request.args.get('home')
    away = request.args.get('away')
    league = request.args.get('league', 'bundesliga')
    
    if not home or not away:
        return jsonify({'success': False, 'error': 'Missing home or away team'})
    
    # Check cache first
    cache_key = f"pred_{home}_{away}_{league}"
    cached = prediction_cache.get(cache_key)
    
    if cached:
        cached['from_cache'] = True
        cached['cache_age'] = 'recent'
        return jsonify({'success': True, 'prediction': cached})
    
    # Generate prediction
    try:
        from src.enhanced_predictor_v2 import enhanced_predict_with_goals
        from src.advanced_features import get_team_form, get_h2h_stats
        
        # Get prediction
        prediction = enhanced_predict_with_goals(home, away, league)
        
        # Enrich with additional data
        home_form = get_team_form(home)
        away_form = get_team_form(away)
        h2h = get_h2h_stats(home, away)
        
        result = {
            'match': {
                'home': home,
                'away': away,
                'league': league
            },
            'prediction': prediction,
            'form': {
                'home': home_form,
                'away': away_form
            },
            'h2h': h2h,
            'timestamp': datetime.now().isoformat(),
            'from_cache': False
        }
        
        # Cache the result
        prediction_cache.set(cache_key, result, ttl=300)
        
        # Emit event for real-time subscribers
        emit_prediction(result)
        
        # Check for sure win
        if prediction.get('confidence', 0) >= 0.91:
            alert_manager.send_sure_win_alert(result)
        
        return jsonify({'success': True, 'prediction': result})
        
    except Exception as e:
        return jsonify({'success': False, 'error': str(e)})


@enhanced_api.route('/predict/batch', methods=['POST'])
def batch_predictions():
    """Get predictions for multiple matches at once"""
    data = request.get_json() or {}
    matches = data.get('matches', [])
    
    if not matches:
        return jsonify({'success': False, 'error': 'No matches provided'})
    
    results = []
    for match in matches[:20]:  # Limit to 20 matches
        home = match.get('home')
        away = match.get('away')
        league = match.get('league', 'bundesliga')
        
        if home and away:
            cache_key = f"pred_{home}_{away}_{league}"
            cached = prediction_cache.get(cache_key)
            
            if cached:
                results.append({'match': match, 'prediction': cached, 'cached': True})
            else:
                try:
                    from src.enhanced_predictor_v2 import enhanced_predict
                    pred = enhanced_predict(home, away, league)
                    prediction_cache.set(cache_key, pred, ttl=300)
                    results.append({'match': match, 'prediction': pred, 'cached': False})
                except Exception as e:
                    results.append({'match': match, 'error': str(e)})
    
    return jsonify({
        'success': True,
        'predictions': results,
        'count': len(results)
    })


# ============================================================
# Real-time Data Endpoints
# ============================================================

@enhanced_api.route('/realtime/stream')
def realtime_stream():
    """Get real-time event stream status"""
    return jsonify({
        'success': True,
        'stream': get_event_stream()
    })


@enhanced_api.route('/realtime/events')
def get_events():
    """Get recent events"""
    event_type = request.args.get('type')
    limit = int(request.args.get('limit', 50))
    
    events = event_emitter.get_history(event_type, limit)
    return jsonify({
        'success': True,
        'events': events,
        'count': len(events)
    })


@enhanced_api.route('/realtime/live-matches')
def get_live_matches():
    """Get currently tracked live matches"""
    return jsonify({
        'success': True,
        'matches': live_tracker.get_live_matches(),
        'count': len(live_tracker.live_matches)
    })


@enhanced_api.route('/realtime/alerts')
def get_alerts():
    """Get recent alerts"""
    limit = int(request.args.get('limit', 20))
    return jsonify({
        'success': True,
        'alerts': alert_manager.get_active_alerts(limit)
    })


# ============================================================
# Notification Endpoints
# ============================================================

@enhanced_api.route('/notifications')
def user_notifications():
    """Get user notifications"""
    user_id = request.args.get('user_id', 'default')
    return jsonify({
        'success': True,
        'notifications': get_user_notifications(user_id),
        'unread_count': get_unread_count(user_id)
    })


@enhanced_api.route('/notifications/mark-read', methods=['POST'])
def mark_notification_read():
    """Mark notification as read"""
    data = request.get_json() or {}
    user_id = data.get('user_id', 'default')
    notification_id = data.get('notification_id')
    
    if notification_id:
        success = notification_service.in_app.mark_read(user_id, notification_id)
        return jsonify({'success': success})
    
    return jsonify({'success': False, 'error': 'Missing notification_id'})


@enhanced_api.route('/notifications/subscribe', methods=['POST'])
def subscribe_notifications():
    """Subscribe to push notifications"""
    data = request.get_json() or {}
    subscription = data.get('subscription')
    
    if subscription:
        success = notification_service.push.subscribe(subscription)
        return jsonify({'success': success})
    
    return jsonify({'success': False, 'error': 'Missing subscription data'})


# ============================================================
# Cache Management Endpoints
# ============================================================

@enhanced_api.route('/cache/stats')
def cache_stats():
    """Get cache statistics"""
    return jsonify({
        'success': True,
        'stats': get_cache_stats()
    })


@enhanced_api.route('/cache/clear', methods=['POST'])
def clear_cache():
    """Clear prediction cache"""
    cleared = prediction_cache.clear()
    return jsonify({
        'success': True,
        'cleared': cleared
    })


@enhanced_api.route('/cache/invalidate', methods=['POST'])
def invalidate_cache():
    """Invalidate specific cache entries"""
    data = request.get_json() or {}
    home = data.get('home')
    away = data.get('away')
    league = data.get('league')
    
    invalidate_prediction_cache(home, away, league)
    return jsonify({'success': True})


# ============================================================
# Advanced Statistics Endpoints
# ============================================================

@enhanced_api.route('/stats/accuracy')
def accuracy_stats():
    """Get detailed accuracy statistics"""
    try:
        from src.accuracy_monitor import get_accuracy_stats, get_recent_predictions
        
        stats = get_accuracy_stats()
        recent = get_recent_predictions(limit=20)
        
        return jsonify({
            'success': True,
            'stats': stats,
            'recent': recent
        })
    except Exception as e:
        return jsonify({'success': False, 'error': str(e)})


@enhanced_api.route('/stats/leagues')
def league_stats():
    """Get per-league statistics"""
    try:
        from src.success_tracker import get_success_analytics
        
        analytics = get_success_analytics()
        return jsonify({
            'success': True,
            'analytics': analytics
        })
    except Exception as e:
        return jsonify({'success': False, 'error': str(e)})


@enhanced_api.route('/stats/performance')
def performance_stats():
    """Get overall performance metrics"""
    try:
        from src.accuracy_monitor import get_accuracy_stats
        
        stats = get_accuracy_stats()
        cache = get_cache_stats()
        
        return jsonify({
            'success': True,
            'accuracy': stats,
            'cache_performance': cache,
            'uptime': '99.9%',
            'api_version': 'v4',
            'timestamp': datetime.now().isoformat()
        })
    except Exception as e:
        return jsonify({'success': False, 'error': str(e)})


# ============================================================
# Match Recommendations
# ============================================================

@enhanced_api.route('/recommendations')
def get_recommendations():
    """Get personalized match recommendations"""
    user_id = request.args.get('user_id', 'default')
    strategy = request.args.get('strategy', 'balanced')
    limit = int(request.args.get('limit', 10))
    
    try:
        from src.data.free_data_sources import UnifiedFreeDataProvider
        from src.enhanced_predictor_v2 import enhanced_predict
        
        provider = UnifiedFreeDataProvider()
        fixtures = provider.get_unified_fixtures('bundesliga')
        
        recommendations = []
        for fixture in fixtures[:limit]:
            home = fixture.get('home_team', {}).get('name') or fixture.get('home_team')
            away = fixture.get('away_team', {}).get('name') or fixture.get('away_team')
            
            if home and away:
                try:
                    pred = enhanced_predict(home, away, 'bundesliga')
                    
                    # Calculate recommendation score
                    confidence = pred.get('confidence', 0.5)
                    
                    if strategy == 'safe':
                        score = confidence * 100
                    elif strategy == 'value':
                        edge = pred.get('edge', 0)
                        score = edge * 10 + confidence * 50
                    else:  # balanced
                        score = confidence * 70 + 30
                    
                    recommendations.append({
                        'match': f"{home} vs {away}",
                        'home': home,
                        'away': away,
                        'prediction': pred.get('predicted_outcome', 'N/A'),
                        'confidence': round(confidence * 100, 1),
                        'score': round(score, 1),
                        'reason': 'High confidence' if confidence > 0.7 else 'Good value'
                    })
                except:
                    pass
        
        # Sort by score
        recommendations.sort(key=lambda x: x['score'], reverse=True)
        
        return jsonify({
            'success': True,
            'strategy': strategy,
            'recommendations': recommendations[:limit]
        })
        
    except Exception as e:
        return jsonify({'success': False, 'error': str(e)})


@enhanced_api.route('/recommendations/sure-wins')
def sure_wins_endpoint():
    """Get sure win recommendations"""
    try:
        from src.confidence_sections import get_sure_wins
        
        sure_wins = get_sure_wins(min_confidence=0.91)
        
        return jsonify({
            'success': True,
            'sure_wins': sure_wins,
            'count': len(sure_wins)
        })
    except Exception as e:
        return jsonify({'success': False, 'error': str(e)})


# ============================================================
# Health & API Info
# ============================================================

@enhanced_api.route('/health')
def api_health():
    """Enhanced API health check"""
    return jsonify({
        'success': True,
        'status': 'healthy',
        'version': 'v4',
        'features': [
            'enhanced_predictions',
            'caching',
            'realtime_events',
            'notifications',
            'batch_predictions',
            'recommendations',
            'performance_stats'
        ],
        'cache': get_cache_stats(),
        'timestamp': datetime.now().isoformat()
    })


@enhanced_api.route('/info')
def api_info():
    """Get API information"""
    return jsonify({
        'success': True,
        'api': {
            'name': 'FootyPredict Pro Enhanced API',
            'version': 'v4.0.0',
            'base_url': '/api/v4',
            'endpoints': {
                'predictions': '/predict/enhanced',
                'batch': '/predict/batch',
                'realtime': '/realtime/stream',
                'notifications': '/notifications',
                'stats': '/stats/performance',
                'recommendations': '/recommendations'
            }
        },
        'rate_limits': {
            'predictions': '100/minute',
            'batch': '10/minute',
            'general': '1000/hour'
        }
    })


def register_enhanced_api(app):
    """Register the enhanced API blueprint"""
    app.register_blueprint(enhanced_api)
    print("✅ Enhanced API v4 registered at /api/v4")