import sqlite3
import json
from pathlib import Path
from datetime import datetime
from typing import Optional, List, Dict
from contextlib import contextmanager
from loguru import logger

class DatabaseManager:
    def __init__(self, db_path="database/identities.db"):
        self.db_path = db_path
        self.init_database()
    
    def init_database(self):
        """تهيئة قاعدة البيانات والجداول"""
        Path(self.db_path).parent.mkdir(parents=True, exist_ok=True)
        
        with self.get_connection() as conn:
            cursor = conn.cursor()
            
            # جدول الهويات
            cursor.execute("""
                CREATE TABLE IF NOT EXISTS identities (
                    id TEXT PRIMARY KEY,
                    name TEXT NOT NULL,
                    embedding TEXT NOT NULL,
                    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                    metadata TEXT,
                    face_image_path TEXT,
                    verification_count INTEGER DEFAULT 0,
                    last_verified TIMESTAMP
                )
            """)
            
            # جدول سجل العمليات
            cursor.execute("""
                CREATE TABLE IF NOT EXISTS audit_log (
                    id INTEGER PRIMARY KEY AUTOINCREMENT,
                    action TEXT NOT NULL,
                    identity_id TEXT,
                    status TEXT,
                    details TEXT,
                    timestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                    ip_address TEXT,
                    user_agent TEXT
                )
            """)
            
            # جدول الإحصائيات
            cursor.execute("""
                CREATE TABLE IF NOT EXISTS statistics (
                    metric_name TEXT PRIMARY KEY,
                    metric_value INTEGER DEFAULT 0,
                    last_updated TIMESTAMP DEFAULT CURRENT_TIMESTAMP
                )
            """)
            
            # إضافة بعض الإحصائيات الابتدائية
            cursor.execute("""
                INSERT OR IGNORE INTO statistics (metric_name, metric_value) 
                VALUES ('total_enrollments', 0), ('total_searches', 0), ('total_matches', 0)
            """)
            
            conn.commit()
            logger.info("✅ Database initialized successfully")
    
    @contextmanager
    def get_connection(self):
        """إنشاء اتصال بقاعدة البيانات"""
        conn = sqlite3.connect(self.db_path)
        conn.row_factory = sqlite3.Row
        try:
            yield conn
        finally:
            conn.close()
    
    def add_identity(self, identity_id: str, name: str, embedding: np.ndarray, 
                     metadata: Dict = None, face_image_path: str = None) -> bool:
        """إضافة هوية جديدة"""
        try:
            with self.get_connection() as conn:
                cursor = conn.cursor()
                cursor.execute("""
                    INSERT INTO identities (id, name, embedding, metadata, face_image_path)
                    VALUES (?, ?, ?, ?, ?)
                """, (
                    identity_id, 
                    name, 
                    json.dumps(embedding.tolist()),
                    json.dumps(metadata) if metadata else None,
                    face_image_path
                ))
                
                # تحديث الإحصاءات
                cursor.execute("""
                    UPDATE statistics 
                    SET metric_value = metric_value + 1, last_updated = CURRENT_TIMESTAMP
                    WHERE metric_name = 'total_enrollments'
                """)
                
                conn.commit()
                logger.info(f"✅ Added identity: {identity_id} - {name}")
                return True
                
        except Exception as e:
            logger.error(f"❌ Failed to add identity: {e}")
            return False
    
    def get_identity(self, identity_id: str) -> Optional[Dict]:
        """الحصول على هوية محددة"""
        try:
            with self.get_connection() as conn:
                cursor = conn.cursor()
                cursor.execute("SELECT * FROM identities WHERE id = ?", (identity_id,))
                row = cursor.fetchone()
                
                if row:
                    return dict(row)
                return None
                
        except Exception as e:
            logger.error(f"❌ Failed to get identity: {e}")
            return None
    
    def update_verification(self, identity_id: str):
        """تحديث عدد التحقق من الهوية"""
        try:
            with self.get_connection() as conn:
                cursor = conn.cursor()
                cursor.execute("""
                    UPDATE identities 
                    SET verification_count = verification_count + 1,
                        last_verified = CURRENT_TIMESTAMP,
                        updated_at = CURRENT_TIMESTAMP
                    WHERE id = ?
                """, (identity_id,))
                
                cursor.execute("""
                    UPDATE statistics 
                    SET metric_value = metric_value + 1, last_updated = CURRENT_TIMESTAMP
                    WHERE metric_name = 'total_matches'
                """)
                
                conn.commit()
                return True
                
        except Exception as e:
            logger.error(f"❌ Failed to update verification: {e}")
            return False
    
    def log_action(self, action: str, identity_id: str = None, 
                   status: str = "success", details: str = None,
                   ip_address: str = None, user_agent: str = None):
        """تسجيل عملية في سجل المراجعة"""
        try:
            with self.get_connection() as conn:
                cursor = conn.cursor()
                cursor.execute("""
                    INSERT INTO audit_log (action, identity_id, status, details, ip_address, user_agent)
                    VALUES (?, ?, ?, ?, ?, ?)
                """, (action, identity_id, status, details, ip_address, user_agent))
                conn.commit()
                
        except Exception as e:
            logger.error(f"❌ Failed to log action: {e}")
    
    def get_statistics(self) -> Dict:
        """الحصول على الإحصائيات"""
        try:
            with self.get_connection() as conn:
                cursor = conn.cursor()
                cursor.execute("SELECT metric_name, metric_value FROM statistics")
                stats = {row['metric_name']: row['metric_value'] for row in cursor.fetchall()}
                
                # إحصائيات إضافية
                cursor.execute("SELECT COUNT(*) as total FROM identities")
                stats['total_identities'] = cursor.fetchone()['total']
                
                cursor.execute("""
                    SELECT COUNT(*) as verified_today 
                    FROM identities 
                    WHERE DATE(last_verified) = DATE('now')
                """)
                stats['verified_today'] = cursor.fetchone()['verified_today']
                
                return stats
                
        except Exception as e:
            logger.error(f"❌ Failed to get statistics: {e}")
            return {}
    
    def get_all_identities(self, limit: int = 100, offset: int = 0) -> List[Dict]:
        """الحصول على جميع الهويات"""
        try:
            with self.get_connection() as conn:
                cursor = conn.cursor()
                cursor.execute("""
                    SELECT id, name, created_at, updated_at, verification_count, last_verified
                    FROM identities
                    ORDER BY created_at DESC
                    LIMIT ? OFFSET ?
                """, (limit, offset))
                
                return [dict(row) for row in cursor.fetchall()]
                
        except Exception as e:
            logger.error(f"❌ Failed to get all identities: {e}")
            return []
    
    def delete_identity(self, identity_id: str) -> bool:
        """حذف هوية"""
        try:
            with self.get_connection() as conn:
                cursor = conn.cursor()
                cursor.execute("DELETE FROM identities WHERE id = ?", (identity_id,))
                conn.commit()
                
                if cursor.rowcount > 0:
                    logger.info(f"✅ Deleted identity: {identity_id}")
                    return True
                return False
                
        except Exception as e:
            logger.error(f"❌ Failed to delete identity: {e}")
            return False