#!/usr/bin/env python3
"""
Debian Forge System Administration Interface (Simplified)

This module provides system administration functionality without external dependencies:
- System configuration management
- Build monitoring and health checks
- Resource usage tracking (simulated)
- System maintenance tools
"""

import json
import os
import sqlite3
import time
from typing import Dict, List, Optional, Any
from dataclasses import dataclass
from pathlib import Path

@dataclass
class SystemStatus:
    """System status information"""
    status: str
    cpu_percent: float
    memory_percent: float
    disk_percent: float
    active_builds: int
    queued_builds: int
    total_builds: int
    uptime: str
    last_updated: str

@dataclass
class BuildStatistics:
    """Build statistics and metrics"""
    total_builds: int
    successful_builds: int
    failed_builds: int
    average_build_time: float
    builds_per_day: float
    most_used_blueprint: str
    resource_usage_trend: Dict[str, float]

@dataclass
class SystemConfiguration:
    """System configuration settings"""
    max_concurrent_builds: int
    resource_limits: Dict[str, int]
    cleanup_policies: Dict[str, Any]
    security_settings: Dict[str, Any]
    notification_settings: Dict[str, Any]

class AdminInterfaceSimple:
    """Simplified system administration interface for Debian Forge"""
    
    def __init__(self, db_path: str = "admin.db"):
        self.db_path = db_path
        self._init_database()
    
    def _init_database(self):
        """Initialize the admin database"""
        conn = sqlite3.connect(self.db_path)
        cursor = conn.cursor()
        
        # Create system configuration table
        cursor.execute("""
            CREATE TABLE IF NOT EXISTS system_config (
                key TEXT PRIMARY KEY,
                value TEXT NOT NULL,
                updated_at TEXT NOT NULL
            )
        """)
        
        # Create system logs table
        cursor.execute("""
            CREATE TABLE IF NOT EXISTS system_logs (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                level TEXT NOT NULL,
                message TEXT NOT NULL,
                component TEXT NOT NULL,
                timestamp TEXT NOT NULL
            )
        """)
        
        # Create maintenance tasks table
        cursor.execute("""
            CREATE TABLE IF NOT EXISTS maintenance_tasks (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                task_name TEXT NOT NULL,
                status TEXT NOT NULL,
                scheduled_at TEXT NOT NULL,
                completed_at TEXT,
                result TEXT
            )
        """)
        
        # Insert default configuration
        default_config = {
            "max_concurrent_builds": "4",
            "cpu_limit": "80",
            "memory_limit": "85",
            "disk_limit": "90",
            "cleanup_interval": "3600",
            "log_retention_days": "30",
            "backup_interval": "86400"
        }
        
        for key, value in default_config.items():
            cursor.execute("""
                INSERT OR IGNORE INTO system_config (key, value, updated_at)
                VALUES (?, ?, ?)
            """, (key, value, time.strftime("%Y-%m-%d %H:%M:%S")))
        
        conn.commit()
        conn.close()
    
    def get_system_status(self) -> SystemStatus:
        """Get current system status (with simulated resource data)"""
        import random
        
        # Simulate resource usage
        cpu_percent = random.uniform(20, 80)
        memory_percent = random.uniform(30, 85)
        disk_percent = random.uniform(60, 75)
        
        # Get build statistics (simulated for now)
        active_builds = self._get_active_builds_count()
        queued_builds = self._get_queued_builds_count()
        total_builds = self._get_total_builds_count()
        
        # Simulate system uptime
        uptime = "2d 14h 37m"
        
        # Determine overall status
        status = "healthy"
        if cpu_percent > 90 or memory_percent > 90 or disk_percent > 90:
            status = "warning"
        if cpu_percent > 95 or memory_percent > 95 or disk_percent > 95:
            status = "critical"
        
        return SystemStatus(
            status=status,
            cpu_percent=cpu_percent,
            memory_percent=memory_percent,
            disk_percent=disk_percent,
            active_builds=active_builds,
            queued_builds=queued_builds,
            total_builds=total_builds,
            uptime=uptime,
            last_updated=time.strftime("%Y-%m-%d %H:%M:%S")
        )
    
    def _get_active_builds_count(self) -> int:
        """Get number of active builds (simulated)"""
        # In real implementation, this would query the build orchestrator
        return 2
    
    def _get_queued_builds_count(self) -> int:
        """Get number of queued builds (simulated)"""
        # In real implementation, this would query the build queue
        return 1
    
    def _get_total_builds_count(self) -> int:
        """Get total number of builds (simulated)"""
        # In real implementation, this would query the build history
        return 47
    
    def get_build_statistics(self) -> BuildStatistics:
        """Get build statistics and metrics"""
        # Simulated statistics - in real implementation, query build database
        return BuildStatistics(
            total_builds=47,
            successful_builds=42,
            failed_builds=5,
            average_build_time=1847.5,  # seconds
            builds_per_day=12.3,
            most_used_blueprint="debian-atomic-base",
            resource_usage_trend={
                "cpu_avg": 65.2,
                "memory_avg": 78.4,
                "disk_growth": 2.1
            }
        )
    
    def get_system_configuration(self) -> SystemConfiguration:
        """Get system configuration"""
        conn = sqlite3.connect(self.db_path)
        cursor = conn.cursor()
        
        cursor.execute("SELECT key, value FROM system_config")
        config_data = dict(cursor.fetchall())
        conn.close()
        
        return SystemConfiguration(
            max_concurrent_builds=int(config_data.get("max_concurrent_builds", "4")),
            resource_limits={
                "cpu": int(config_data.get("cpu_limit", "80")),
                "memory": int(config_data.get("memory_limit", "85")),
                "disk": int(config_data.get("disk_limit", "90"))
            },
            cleanup_policies={
                "interval": int(config_data.get("cleanup_interval", "3600")),
                "log_retention_days": int(config_data.get("log_retention_days", "30"))
            },
            security_settings={
                "require_authentication": True,
                "session_timeout": 3600,
                "password_complexity": True
            },
            notification_settings={
                "email_alerts": False,
                "slack_integration": False,
                "webhook_url": None
            }
        )
    
    def update_system_configuration(self, config: SystemConfiguration) -> bool:
        """Update system configuration"""
        try:
            conn = sqlite3.connect(self.db_path)
            cursor = conn.cursor()
            
            timestamp = time.strftime("%Y-%m-%d %H:%M:%S")
            
            # Update configuration values
            config_updates = [
                ("max_concurrent_builds", str(config.max_concurrent_builds)),
                ("cpu_limit", str(config.resource_limits["cpu"])),
                ("memory_limit", str(config.resource_limits["memory"])),
                ("disk_limit", str(config.resource_limits["disk"])),
                ("cleanup_interval", str(config.cleanup_policies["interval"])),
                ("log_retention_days", str(config.cleanup_policies["log_retention_days"]))
            ]
            
            for key, value in config_updates:
                cursor.execute("""
                    INSERT OR REPLACE INTO system_config (key, value, updated_at)
                    VALUES (?, ?, ?)
                """, (key, value, timestamp))
            
            conn.commit()
            conn.close()
            
            # Log configuration change
            self.log_event("INFO", "System configuration updated", "admin_interface")
            
            return True
            
        except Exception as e:
            self.log_event("ERROR", f"Failed to update configuration: {e}", "admin_interface")
            return False
    
    def log_event(self, level: str, message: str, component: str):
        """Log system event"""
        try:
            conn = sqlite3.connect(self.db_path)
            cursor = conn.cursor()
            
            cursor.execute("""
                INSERT INTO system_logs (level, message, component, timestamp)
                VALUES (?, ?, ?, ?)
            """, (level, message, component, time.strftime("%Y-%m-%d %H:%M:%S")))
            
            conn.commit()
            conn.close()
            
        except Exception as e:
            print(f"Failed to log event: {e}")
    
    def get_system_logs(self, limit: int = 100, level: Optional[str] = None) -> List[Dict[str, Any]]:
        """Get system logs"""
        try:
            conn = sqlite3.connect(self.db_path)
            cursor = conn.cursor()
            
            if level:
                cursor.execute("""
                    SELECT level, message, component, timestamp
                    FROM system_logs WHERE level = ?
                    ORDER BY timestamp DESC LIMIT ?
                """, (level, limit))
            else:
                cursor.execute("""
                    SELECT level, message, component, timestamp
                    FROM system_logs
                    ORDER BY timestamp DESC LIMIT ?
                """, (limit,))
            
            logs = []
            for row in cursor.fetchall():
                logs.append({
                    "level": row[0],
                    "message": row[1],
                    "component": row[2],
                    "timestamp": row[3]
                })
            
            conn.close()
            return logs
            
        except Exception as e:
            self.log_event("ERROR", f"Failed to retrieve logs: {e}", "admin_interface")
            return []
    
    def schedule_maintenance_task(self, task_name: str, scheduled_time: str) -> bool:
        """Schedule a maintenance task"""
        try:
            conn = sqlite3.connect(self.db_path)
            cursor = conn.cursor()
            
            cursor.execute("""
                INSERT INTO maintenance_tasks (task_name, status, scheduled_at)
                VALUES (?, ?, ?)
            """, (task_name, "scheduled", scheduled_time))
            
            conn.commit()
            conn.close()
            
            self.log_event("INFO", f"Maintenance task scheduled: {task_name}", "admin_interface")
            return True
            
        except Exception as e:
            self.log_event("ERROR", f"Failed to schedule task: {e}", "admin_interface")
            return False
    
    def get_maintenance_tasks(self) -> List[Dict[str, Any]]:
        """Get maintenance tasks"""
        try:
            conn = sqlite3.connect(self.db_path)
            cursor = conn.cursor()
            
            cursor.execute("""
                SELECT task_name, status, scheduled_at, completed_at, result
                FROM maintenance_tasks
                ORDER BY scheduled_at DESC
            """)
            
            tasks = []
            for row in cursor.fetchall():
                tasks.append({
                    "task_name": row[0],
                    "status": row[1],
                    "scheduled_at": row[2],
                    "completed_at": row[3],
                    "result": row[4]
                })
            
            conn.close()
            return tasks
            
        except Exception as e:
            self.log_event("ERROR", f"Failed to retrieve tasks: {e}", "admin_interface")
            return []
    
    def run_system_cleanup(self) -> Dict[str, Any]:
        """Run system cleanup tasks"""
        results = {
            "status": "success",
            "tasks_completed": [],
            "tasks_failed": [],
            "cleanup_summary": {}
        }
        
        try:
            # Cleanup old logs
            self._cleanup_old_logs()
            results["tasks_completed"].append("log_cleanup")
            
            # Cleanup temporary files
            temp_cleaned = self._cleanup_temp_files()
            results["tasks_completed"].append("temp_cleanup")
            results["cleanup_summary"]["temp_files_removed"] = temp_cleaned
            
            # Cleanup old build artifacts (simulated)
            artifacts_cleaned = self._cleanup_old_artifacts()
            results["tasks_completed"].append("artifact_cleanup")
            results["cleanup_summary"]["artifacts_removed"] = artifacts_cleaned
            
            self.log_event("INFO", "System cleanup completed successfully", "admin_interface")
            
        except Exception as e:
            results["status"] = "partial_failure"
            results["tasks_failed"].append(f"cleanup_error: {e}")
            self.log_event("ERROR", f"System cleanup failed: {e}", "admin_interface")
        
        return results
    
    def _cleanup_old_logs(self):
        """Cleanup old log entries"""
        config = self.get_system_configuration()
        retention_days = config.cleanup_policies["log_retention_days"]
        
        conn = sqlite3.connect(self.db_path)
        cursor = conn.cursor()
        
        cutoff_date = time.strftime("%Y-%m-%d %H:%M:%S", 
                                    time.localtime(time.time() - (retention_days * 86400)))
        
        cursor.execute("DELETE FROM system_logs WHERE timestamp < ?", (cutoff_date,))
        conn.commit()
        conn.close()
    
    def _cleanup_temp_files(self) -> int:
        """Cleanup temporary files"""
        temp_dirs = ["/tmp", "/var/tmp"]
        files_removed = 0
        
        for temp_dir in temp_dirs:
            if os.path.exists(temp_dir):
                for filename in os.listdir(temp_dir):
                    if filename.startswith("debian-forge-") or filename.startswith("osbuild-"):
                        filepath = os.path.join(temp_dir, filename)
                        try:
                            if os.path.isfile(filepath):
                                os.remove(filepath)
                                files_removed += 1
                            elif os.path.isdir(filepath):
                                import shutil
                                shutil.rmtree(filepath)
                                files_removed += 1
                        except Exception:
                            pass  # Ignore errors for individual files
        
        return files_removed
    
    def _cleanup_old_artifacts(self) -> int:
        """Cleanup old build artifacts (simulated)"""
        # In real implementation, this would cleanup old build artifacts
        # based on configured retention policies
        return 15  # Simulated number of artifacts removed
    
    def get_resource_usage_history(self, hours: int = 24) -> Dict[str, List[float]]:
        """Get resource usage history (simulated data)"""
        # In real implementation, this would query stored metrics
        import random
        
        data_points = hours * 6  # Every 10 minutes
        
        return {
            "timestamps": [i * 10 for i in range(data_points)],  # Minutes ago
            "cpu_usage": [random.uniform(20, 80) for _ in range(data_points)],
            "memory_usage": [random.uniform(30, 85) for _ in range(data_points)],
            "disk_usage": [random.uniform(60, 75) for _ in range(data_points)]
        }
    
    def restart_services(self, services: List[str]) -> Dict[str, bool]:
        """Restart system services (simulated)"""
        results = {}
        
        for service in services:
            try:
                # In real implementation, this would use systemctl or similar
                self.log_event("INFO", f"Restarting service: {service}", "admin_interface")
                results[service] = True
            except Exception as e:
                self.log_event("ERROR", f"Failed to restart {service}: {e}", "admin_interface")
                results[service] = False
        
        return results
    
    def get_admin_dashboard_data(self) -> Dict[str, Any]:
        """Get comprehensive dashboard data for admin interface"""
        return {
            "system_status": self.get_system_status().__dict__,
            "build_statistics": self.get_build_statistics().__dict__,
            "system_configuration": self.get_system_configuration().__dict__,
            "recent_logs": self.get_system_logs(limit=10),
            "maintenance_tasks": self.get_maintenance_tasks(),
            "resource_history": self.get_resource_usage_history(hours=1)
        }