"""
config.py - Configuration Management System
"""

import yaml
from pathlib import Path
from typing import Any, Dict, Optional


class Config:
    def __init__(self, config_path: str = "config.yaml"):
        self.config_path = Path(config_path)
        self.config = self._load_config()
        print(f"✅ Configuration loaded")
    
    def _load_config(self) -> Dict:
        if not self.config_path.exists():
            print(f"⚠️  Config file not found: {self.config_path}")
            print("   Using default configuration")
            return self._get_defaults()
        
        try:
            with open(self.config_path, 'r', encoding='utf-8') as f:
                config = yaml.safe_load(f)
            print(f"   Loaded from: {self.config_path}")
            return config
        except Exception as e:
            print(f"❌ Error loading config: {e}")
            print("   Using default configuration")
            return self._get_defaults()
    
    def _get_defaults(self) -> Dict:
        return {
            'detection': {
                'model': 'yolov8m.pt',
                'confidence_threshold': 0.50,
                'min_detection_area': 900,
                'dog_class_id': 16
            },
            'pose_detection': {
                'model': 'dog-pose-trained.pt',
                'confidence_threshold': 0.5,
                'input_size': 640,
                'keypoint_8_indices': [0, 3, 7, 10, 12, 14, 17, 19]
            },
            'tracking': {
                'max_iou_distance': 0.5,
                'max_age': 90,
                'n_init': 1,
                'use_appearance': True,
                'deletion_threshold_confirmed': 30,
                'deletion_threshold_tentative': 5
            },
            'reid': {
                'model': 'hf-hub:BVRA/MegaDescriptor-L-384',
                'threshold': 0.40,
                'permanent_db_threshold_offset': 0.15,
                'max_features_per_dog': 30
            },
            'health': {
                'temporal_window': 15,
                'min_visible_keypoints': 12,
                'min_view_score': 0.7,
                'blur_threshold': 75
            },
            'dataset': {
                'min_images_per_dog': 14,
                'max_images_per_dog': 30,
                'min_frame_gap': 15,
                'sample_rate': 1
            },
            'map': {
                'default_location': [38.9637, 35.2433],
                'default_zoom': 13
            },
            'database': {
                'path': 'dog_monitoring.db',
                'backup_enabled': True
            },
            'app': {
                'max_video_duration': 600,
                'max_memory_mb': 2000,
                'max_total_dogs': 50
            }
        }
    
    def get(self, path: str, default: Any = None) -> Any:
        keys = path.split('.')
        value = self.config
        
        for key in keys:
            if isinstance(value, dict) and key in value:
                value = value[key]
            else:
                return default
        
        return value
    
    def set(self, path: str, value: Any):
        keys = path.split('.')
        config = self.config
        
        for key in keys[:-1]:
            if key not in config:
                config[key] = {}
            config = config[key]
        
        config[keys[-1]] = value
    
    def save(self, output_path: Optional[str] = None):
        save_path = Path(output_path) if output_path else self.config_path
        
        try:
            with open(save_path, 'w', encoding='utf-8') as f:
                yaml.dump(self.config, f, default_flow_style=False, allow_unicode=True)
            print(f"✅ Configuration saved to {save_path}")
        except Exception as e:
            print(f"❌ Error saving config: {e}")
    
    def get_detection_config(self) -> Dict:
        return self.config.get('detection', self._get_defaults()['detection'])
    
    def get_pose_config(self) -> Dict:
        return self.config.get('pose_detection', self._get_defaults()['pose_detection'])
    
    def get_tracking_config(self) -> Dict:
        return self.config.get('tracking', self._get_defaults()['tracking'])
    
    def get_reid_config(self) -> Dict:
        return self.config.get('reid', self._get_defaults()['reid'])
    
    def get_health_config(self) -> Dict:
        return self.config.get('health', self._get_defaults()['health'])
    
    def get_dataset_config(self) -> Dict:
        return self.config.get('dataset', self._get_defaults()['dataset'])
    
    def get_map_config(self) -> Dict:
        return self.config.get('map', self._get_defaults()['map'])
    
    def get_database_config(self) -> Dict:
        return self.config.get('database', self._get_defaults()['database'])
    
    def get_app_config(self) -> Dict:
        return self.config.get('app', self._get_defaults()['app'])
    
    def print_config(self):
        print("\n" + "="*60)
        print("CURRENT CONFIGURATION")
        print("="*60)
        self._print_dict(self.config, indent=0)
        print("="*60 + "\n")
    
    def _print_dict(self, d: Dict, indent: int = 0):
        for key, value in d.items():
            if isinstance(value, dict):
                print("  " * indent + f"{key}:")
                self._print_dict(value, indent + 1)
            else:
                print("  " * indent + f"{key}: {value}")
    
    def validate(self) -> bool:
        required_sections = ['detection', 'tracking', 'reid', 'health', 'database']
        
        for section in required_sections:
            if section not in self.config:
                print(f"❌ Missing required section: {section}")
                return False
        
        print("✅ Configuration validated successfully")
        return True