"""
Global Infrastructure Deployment Service for AITBC
Handles multi-region deployment, load balancing, and global optimization
"""

import asyncio
import json
import logging
from datetime import datetime, timedelta
from pathlib import Path
from typing import Dict, Any, List, Optional
from fastapi import FastAPI, HTTPException
from pydantic import BaseModel

# Configure logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

app = FastAPI(
    title="AITBC Global Infrastructure Service",
    description="Global infrastructure deployment and multi-region optimization",
    version="1.0.0"
)

# Data models
class Region(BaseModel):
    region_id: str
    name: str
    location: str
    endpoint: str
    status: str  # active, inactive, maintenance
    capacity: int
    current_load: float
    latency_ms: float
    compliance_level: str

class GlobalDeployment(BaseModel):
    deployment_id: str
    service_name: str
    target_regions: List[str]
    configuration: Dict[str, Any]
    deployment_strategy: str  # blue_green, canary, rolling
    health_checks: List[str]

class LoadBalancer(BaseModel):
    balancer_id: str
    name: str
    algorithm: str  # round_robin, weighted, least_connections
    target_regions: List[str]
    health_check_interval: int
    failover_threshold: int

class PerformanceMetrics(BaseModel):
    region_id: str
    timestamp: datetime
    cpu_usage: float
    memory_usage: float
    network_io: float
    disk_io: float
    active_connections: int
    response_time_ms: float

# In-memory storage (in production, use database)
global_regions: Dict[str, Dict] = {}
deployments: Dict[str, Dict] = {}
load_balancers: Dict[str, Dict] = {}
performance_metrics: Dict[str, List[Dict]] = {}
compliance_data: Dict[str, Dict] = {}
global_monitoring: Dict[str, Dict] = {}

@app.get("/")
async def root():
    return {
        "service": "AITBC Global Infrastructure Service",
        "status": "running",
        "timestamp": datetime.utcnow().isoformat(),
        "version": "1.0.0"
    }

@app.get("/health")
async def health_check():
    return {
        "status": "healthy",
        "total_regions": len(global_regions),
        "active_regions": len([r for r in global_regions.values() if r["status"] == "active"]),
        "total_deployments": len(deployments),
        "active_load_balancers": len([lb for lb in load_balancers.values() if lb["status"] == "active"])
    }

@app.post("/api/v1/regions/register")
async def register_region(region: Region):
    """Register a new global region"""
    if region.region_id in global_regions:
        raise HTTPException(status_code=400, detail="Region already registered")
    
    # Create region record
    region_record = {
        "region_id": region.region_id,
        "name": region.name,
        "location": region.location,
        "endpoint": region.endpoint,
        "status": region.status,
        "capacity": region.capacity,
        "current_load": region.current_load,
        "latency_ms": region.latency_ms,
        "compliance_level": region.compliance_level,
        "created_at": datetime.utcnow().isoformat(),
        "last_health_check": None,
        "services_deployed": [],
        "performance_history": []
    }
    
    global_regions[region.region_id] = region_record
    
    logger.info(f"Region registered: {region.name} ({region.region_id})")
    
    return {
        "region_id": region.region_id,
        "status": "registered",
        "name": region.name,
        "created_at": region_record["created_at"]
    }

@app.get("/api/v1/regions")
async def list_regions():
    """List all registered regions"""
    return {
        "regions": list(global_regions.values()),
        "total_regions": len(global_regions),
        "active_regions": len([r for r in global_regions.values() if r["status"] == "active"])
    }

@app.get("/api/v1/regions/{region_id}")
async def get_region(region_id: str):
    """Get detailed region information"""
    if region_id not in global_regions:
        raise HTTPException(status_code=404, detail="Region not found")
    
    region = global_regions[region_id].copy()
    
    # Add performance metrics
    region["performance_metrics"] = performance_metrics.get(region_id, [])
    
    # Add compliance data
    region["compliance_data"] = compliance_data.get(region_id, {})
    
    return region

@app.post("/api/v1/deployments/create")
async def create_deployment(deployment: GlobalDeployment):
    """Create a new global deployment"""
    deployment_id = f"deploy_{int(datetime.utcnow().timestamp())}"
    
    # Validate target regions
    for region_id in deployment.target_regions:
        if region_id not in global_regions:
            raise HTTPException(status_code=400, detail=f"Region {region_id} not found")
    
    # Create deployment record
    deployment_record = {
        "deployment_id": deployment_id,
        "service_name": deployment.service_name,
        "target_regions": deployment.target_regions,
        "configuration": deployment.configuration,
        "deployment_strategy": deployment.deployment_strategy,
        "health_checks": deployment.health_checks,
        "status": "pending",
        "created_at": datetime.utcnow().isoformat(),
        "started_at": None,
        "completed_at": None,
        "deployment_progress": {},
        "rollback_available": False
    }
    
    deployments[deployment_id] = deployment_record
    
    # Start async deployment
    asyncio.create_task(execute_deployment(deployment_id))
    
    logger.info(f"Deployment created: {deployment_id} for {deployment.service_name}")
    
    return {
        "deployment_id": deployment_id,
        "status": "pending",
        "service_name": deployment.service_name,
        "target_regions": deployment.target_regions,
        "created_at": deployment_record["created_at"]
    }

@app.get("/api/v1/deployments/{deployment_id}")
async def get_deployment(deployment_id: str):
    """Get deployment status and details"""
    if deployment_id not in deployments:
        raise HTTPException(status_code=404, detail="Deployment not found")
    
    return deployments[deployment_id]

@app.get("/api/v1/deployments")
async def list_deployments(status: Optional[str] = None):
    """List all deployments"""
    deployment_list = list(deployments.values())
    
    if status:
        deployment_list = [d for d in deployment_list if d["status"] == status]
    
    # Sort by creation date (most recent first)
    deployment_list.sort(key=lambda x: x["created_at"], reverse=True)
    
    return {
        "deployments": deployment_list,
        "total_deployments": len(deployment_list),
        "status_filter": status
    }

@app.post("/api/v1/load-balancers/create")
async def create_load_balancer(balancer: LoadBalancer):
    """Create a new load balancer"""
    balancer_id = f"lb_{int(datetime.utcnow().timestamp())}"
    
    # Validate target regions
    for region_id in balancer.target_regions:
        if region_id not in global_regions:
            raise HTTPException(status_code=400, detail=f"Region {region_id} not found")
    
    # Create load balancer record
    balancer_record = {
        "balancer_id": balancer_id,
        "name": balancer.name,
        "algorithm": balancer.algorithm,
        "target_regions": balancer.target_regions,
        "health_check_interval": balancer.health_check_interval,
        "failover_threshold": balancer.failover_threshold,
        "status": "active",
        "created_at": datetime.utcnow().isoformat(),
        "current_weights": {region_id: 1.0 for region_id in balancer.target_regions},
        "health_status": {region_id: "healthy" for region_id in balancer.target_regions},
        "total_requests": 0,
        "failed_requests": 0
    }
    
    load_balancers[balancer_id] = balancer_record
    
    # Start health checking
    asyncio.create_task(start_health_monitoring(balancer_id))
    
    logger.info(f"Load balancer created: {balancer_id} - {balancer.name}")
    
    return {
        "balancer_id": balancer_id,
        "status": "active",
        "name": balancer.name,
        "algorithm": balancer.algorithm,
        "created_at": balancer_record["created_at"]
    }

@app.get("/api/v1/load-balancers")
async def list_load_balancers():
    """List all load balancers"""
    return {
        "load_balancers": list(load_balancers.values()),
        "total_balancers": len(load_balancers),
        "active_balancers": len([lb for lb in load_balancers.values() if lb["status"] == "active"])
    }

@app.post("/api/v1/performance/metrics")
async def record_performance_metrics(metrics: PerformanceMetrics):
    """Record performance metrics for a region"""
    metrics_record = {
        "metrics_id": f"metrics_{int(datetime.utcnow().timestamp())}",
        "region_id": metrics.region_id,
        "timestamp": metrics.timestamp.isoformat(),
        "cpu_usage": metrics.cpu_usage,
        "memory_usage": metrics.memory_usage,
        "network_io": metrics.network_io,
        "disk_io": metrics.disk_io,
        "active_connections": metrics.active_connections,
        "response_time_ms": metrics.response_time_ms
    }
    
    if metrics.region_id not in performance_metrics:
        performance_metrics[metrics.region_id] = []
    
    performance_metrics[metrics.region_id].append(metrics_record)
    
    # Keep only last 1000 records per region
    if len(performance_metrics[metrics.region_id]) > 1000:
        performance_metrics[metrics.region_id] = performance_metrics[metrics.region_id][-1000:]
    
    # Update region performance history
    if metrics.region_id in global_regions:
        global_regions[metrics.region_id]["performance_history"].append({
            "timestamp": metrics.timestamp.isoformat(),
            "cpu_usage": metrics.cpu_usage,
            "memory_usage": metrics.memory_usage,
            "response_time_ms": metrics.response_time_ms
        })
        
        # Keep only last 100 records
        if len(global_regions[metrics.region_id]["performance_history"]) > 100:
            global_regions[metrics.region_id]["performance_history"] = global_regions[metrics.region_id]["performance_history"][-100:]
    
    return {
        "metrics_id": metrics_record["metrics_id"],
        "status": "recorded",
        "timestamp": metrics_record["timestamp"]
    }

@app.get("/api/v1/performance/{region_id}")
async def get_region_performance(region_id: str, hours: int = 24):
    """Get performance metrics for a region"""
    if region_id not in performance_metrics:
        raise HTTPException(status_code=404, detail="No performance data for region")
    
    cutoff_time = datetime.utcnow() - timedelta(hours=hours)
    recent_metrics = [
        m for m in performance_metrics[region_id]
        if datetime.fromisoformat(m["timestamp"]) > cutoff_time
    ]
    
    # Calculate statistics
    if recent_metrics:
        avg_cpu = sum(m["cpu_usage"] for m in recent_metrics) / len(recent_metrics)
        avg_memory = sum(m["memory_usage"] for m in recent_metrics) / len(recent_metrics)
        avg_response_time = sum(m["response_time_ms"] for m in recent_metrics) / len(recent_metrics)
    else:
        avg_cpu = avg_memory = avg_response_time = 0.0
    
    return {
        "region_id": region_id,
        "period_hours": hours,
        "metrics": recent_metrics,
        "statistics": {
            "average_cpu_usage": round(avg_cpu, 2),
            "average_memory_usage": round(avg_memory, 2),
            "average_response_time_ms": round(avg_response_time, 2),
            "total_samples": len(recent_metrics)
        },
        "generated_at": datetime.utcnow().isoformat()
    }

@app.get("/api/v1/compliance/{region_id}")
async def get_region_compliance(region_id: str):
    """Get compliance information for a region"""
    if region_id not in global_regions:
        raise HTTPException(status_code=404, detail="Region not found")
    
    # Mock compliance data (in production, this would be from actual compliance systems)
    compliance_info = {
        "region_id": region_id,
        "region_name": global_regions[region_id]["name"],
        "compliance_level": global_regions[region_id]["compliance_level"],
        "certifications": ["SOC2", "ISO27001", "GDPR"],
        "data_residency": "compliant",
        "last_audit": (datetime.utcnow() - timedelta(days=90)).isoformat(),
        "next_audit": (datetime.utcnow() + timedelta(days=275)).isoformat(),
        "regulations": ["GDPR", "CCPA", "PDPA"],
        "data_protection": "end-to-end-encryption",
        "access_controls": "role-based-access",
        "audit_logging": "enabled"
    }
    
    return compliance_info

@app.get("/api/v1/global/dashboard")
async def get_global_dashboard():
    """Get global infrastructure dashboard"""
    # Calculate global statistics
    total_capacity = sum(r["capacity"] for r in global_regions.values())
    total_load = sum(r["current_load"] for r in global_regions.values())
    avg_latency = sum(r["latency_ms"] for r in global_regions.values()) / len(global_regions) if global_regions else 0
    
    # Deployment statistics
    deployment_stats = {
        "total": len(deployments),
        "pending": len([d for d in deployments.values() if d["status"] == "pending"]),
        "in_progress": len([d for d in deployments.values() if d["status"] == "in_progress"]),
        "completed": len([d for d in deployments.values() if d["status"] == "completed"]),
        "failed": len([d for d in deployments.values() if d["status"] == "failed"])
    }
    
    # Performance summary
    performance_summary = {}
    for region_id, metrics_list in performance_metrics.items():
        if metrics_list:
            latest_metrics = metrics_list[-1]
            performance_summary[region_id] = {
                "cpu_usage": latest_metrics["cpu_usage"],
                "memory_usage": latest_metrics["memory_usage"],
                "response_time_ms": latest_metrics["response_time_ms"],
                "active_connections": latest_metrics["active_connections"]
            }
    
    return {
        "dashboard": {
            "infrastructure": {
                "total_regions": len(global_regions),
                "active_regions": len([r for r in global_regions.values() if r["status"] == "active"]),
                "total_capacity": total_capacity,
                "current_load": total_load,
                "utilization_percentage": round((total_load / total_capacity * 100) if total_capacity > 0 else 0, 2),
                "average_latency_ms": round(avg_latency, 2)
            },
            "deployments": deployment_stats,
            "load_balancers": {
                "total": len(load_balancers),
                "active": len([lb for lb in load_balancers.values() if lb["status"] == "active"])
            },
            "performance": performance_summary,
            "compliance": {
                "compliant_regions": len([r for r in global_regions.values() if r["compliance_level"] == "full"]),
                "partial_compliance": len([r for r in global_regions.values() if r["compliance_level"] == "partial"])
            }
        },
        "generated_at": datetime.utcnow().isoformat()
    }

# Core deployment and load balancing functions
async def execute_deployment(deployment_id: str):
    """Execute a global deployment"""
    deployment = deployments[deployment_id]
    deployment["status"] = "in_progress"
    deployment["started_at"] = datetime.utcnow().isoformat()
    
    try:
        for region_id in deployment["target_regions"]:
            deployment["deployment_progress"][region_id] = {
                "status": "deploying",
                "started_at": datetime.utcnow().isoformat(),
                "progress": 0
            }
            
            # Simulate deployment process
            await simulate_deployment_step(region_id, deployment_id)
            
            deployment["deployment_progress"][region_id].update({
                "status": "completed",
                "completed_at": datetime.utcnow().isoformat(),
                "progress": 100
            })
            
            # Update region services
            if region_id in global_regions:
                if deployment["service_name"] not in global_regions[region_id]["services_deployed"]:
                    global_regions[region_id]["services_deployed"].append(deployment["service_name"])
        
        deployment["status"] = "completed"
        deployment["completed_at"] = datetime.utcnow().isoformat()
        
        logger.info(f"Deployment completed: {deployment_id}")
        
    except Exception as e:
        deployment["status"] = "failed"
        deployment["error"] = str(e)
        logger.error(f"Deployment failed: {deployment_id} - {str(e)}")

async def simulate_deployment_step(region_id: str, deployment_id: str):
    """Simulate deployment step for demo"""
    deployment = deployments[deployment_id]
    
    # Simulate deployment progress
    for progress in range(0, 101, 10):
        if region_id in deployment["deployment_progress"]:
            deployment["deployment_progress"][region_id]["progress"] = progress
        await asyncio.sleep(0.1)  # Simulate work

async def start_health_monitoring(balancer_id: str):
    """Start health monitoring for a load balancer"""
    balancer = load_balancers[balancer_id]
    
    while balancer["status"] == "active":
        try:
            # Check health of target regions
            for region_id in balancer["target_regions"]:
                if region_id in global_regions:
                    region = global_regions[region_id]
                    
                    # Simulate health check (in production, this would be actual health checks)
                    is_healthy = region["status"] == "active" and region["current_load"] < region["capacity"] * 0.9
                    
                    balancer["health_status"][region_id] = "healthy" if is_healthy else "unhealthy"
            
            # Update load balancer weights based on performance
            update_load_balancer_weights(balancer_id)
            
            await asyncio.sleep(balancer["health_check_interval"])
            
        except Exception as e:
            logger.error(f"Health monitoring error for {balancer_id}: {str(e)}")
            await asyncio.sleep(10)

def update_load_balancer_weights(balancer_id: str):
    """Update load balancer weights based on region performance"""
    balancer = load_balancers[balancer_id]
    
    if balancer["algorithm"] == "weighted":
        # Calculate weights based on capacity and current load
        for region_id in balancer["target_regions"]:
            if region_id in global_regions:
                region = global_regions[region_id]
                
                # Weight based on available capacity
                available_capacity = region["capacity"] - region["current_load"]
                total_available = sum(
                    global_regions[r]["capacity"] - global_regions[r]["current_load"]
                    for r in balancer["target_regions"]
                    if r in global_regions
                )
                
                if total_available > 0:
                    weight = available_capacity / total_available
                    balancer["current_weights"][region_id] = round(weight, 3)

# Background task for global monitoring
async def global_monitoring_task():
    """Background task for global infrastructure monitoring"""
    while True:
        await asyncio.sleep(60)  # Monitor every minute
        
        # Update global monitoring data
        global_monitoring["last_update"] = datetime.utcnow().isoformat()
        global_monitoring["total_requests"] = sum(lb.get("total_requests", 0) for lb in load_balancers.values())
        global_monitoring["failed_requests"] = sum(lb.get("failed_requests", 0) for lb in load_balancers.values())
        
        # Check for regions that need attention
        for region_id, region in global_regions.items():
            if region["current_load"] > region["capacity"] * 0.8:
                logger.warning(f"High load detected in region {region_id}: {region['current_load']}/{region['capacity']}")
            
            if region["latency_ms"] > 500:
                logger.warning(f"High latency detected in region {region_id}: {region['latency_ms']}ms")

# Initialize with some default regions
@app.on_event("startup")
async def startup_event():
    logger.info("Starting AITBC Global Infrastructure Service")
    
    # Initialize default regions
    default_regions = [
        {
            "region_id": "us-east-1",
            "name": "US East (N. Virginia)",
            "location": "North America",
            "endpoint": "https://us-east-1.api.aitbc.dev",
            "status": "active",
            "capacity": 10000,
            "current_load": 3500,
            "latency_ms": 45,
            "compliance_level": "full"
        },
        {
            "region_id": "eu-west-1",
            "name": "EU West (Ireland)",
            "location": "Europe",
            "endpoint": "https://eu-west-1.api.aitbc.dev",
            "status": "active",
            "capacity": 8000,
            "current_load": 2800,
            "latency_ms": 38,
            "compliance_level": "full"
        },
        {
            "region_id": "ap-southeast-1",
            "name": "AP Southeast (Singapore)",
            "location": "Asia Pacific",
            "endpoint": "https://ap-southeast-1.api.aitbc.dev",
            "status": "active",
            "capacity": 6000,
            "current_load": 2200,
            "latency_ms": 62,
            "compliance_level": "partial"
        }
    ]
    
    for region_data in default_regions:
        region = Region(**region_data)
        region_record = {
            "region_id": region.region_id,
            "name": region.name,
            "location": region.location,
            "endpoint": region.endpoint,
            "status": region.status,
            "capacity": region.capacity,
            "current_load": region.current_load,
            "latency_ms": region.latency_ms,
            "compliance_level": region.compliance_level,
            "created_at": datetime.utcnow().isoformat(),
            "last_health_check": None,
            "services_deployed": [],
            "performance_history": []
        }
        global_regions[region.region_id] = region_record
    
    # Start global monitoring
    asyncio.create_task(global_monitoring_task())

@app.on_event("shutdown")
async def shutdown_event():
    logger.info("Shutting down AITBC Global Infrastructure Service")

if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=8017, log_level="info")