"""
Capability Registry — реєстрація воркерів в Postgres
"""

import asyncio
import asyncpg
import json
import os
import platform
import subprocess
from datetime import datetime
from typing import Dict, Any, Optional


class CapabilityRegistry:
    def __init__(self, postgres_url: str, node_id: str, tier: str, region: str):
        self.postgres_url = postgres_url
        self.node_id = node_id
        self.tier = tier
        self.region = region
        self.pool: Optional[asyncpg.Pool] = None
        
    async def connect(self):
        """Підключення до Postgres"""
        if not self.postgres_url:
            print("⚠️  CAPABILITY_REGISTRY не встановлено, пропускаємо реєстрацію")
            return
            
        try:
            self.pool = await asyncpg.create_pool(self.postgres_url)
            await self._ensure_table()
        except Exception as e:
            print(f"❌ Помилка підключення до Postgres: {e}")
            self.pool = None
            
    async def _ensure_table(self):
        """Створення таблиці worker_capabilities якщо не існує"""
        async with self.pool.acquire() as conn:
            await conn.execute("""
                CREATE TABLE IF NOT EXISTS worker_capabilities (
                    node_id VARCHAR(255) PRIMARY KEY,
                    tier VARCHAR(10) NOT NULL,
                    region VARCHAR(50),
                    trust_zone VARCHAR(50),
                    hardware JSONB NOT NULL,
                    capabilities JSONB NOT NULL,
                    status VARCHAR(20) NOT NULL,
                    last_heartbeat TIMESTAMP WITH TIME ZONE NOT NULL,
                    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
                    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
                );
                
                CREATE INDEX IF NOT EXISTS idx_worker_capabilities_tier 
                    ON worker_capabilities(tier);
                CREATE INDEX IF NOT EXISTS idx_worker_capabilities_status 
                    ON worker_capabilities(status);
            """)
            
    async def _detect_hardware(self) -> Dict[str, Any]:
        """Автоматичне визначення hardware capabilities"""
        hardware = {
            "cpu_cores": os.cpu_count() or 1,
            "ram_gb": self._get_ram_gb(),
            "gpu": False,
            "gpu_model": None,
            "vram_gb": 0,
            "cuda_version": None
        }
        
        # Перевірка GPU (NVIDIA)
        try:
            result = subprocess.run(["nvidia-smi", "--query-gpu=name,memory.total", "--format=csv,noheader"], 
                                  capture_output=True, text=True, timeout=5)
            if result.returncode == 0:
                lines = result.stdout.strip().split("\n")
                if lines:
                    gpu_info = lines[0].split(",")
                    hardware["gpu"] = True
                    hardware["gpu_model"] = gpu_info[0].strip()
                    # Парсинг VRAM (формат: "XXXXX MiB")
                    vram_str = gpu_info[1].strip().replace("MiB", "").strip()
                    hardware["vram_gb"] = int(vram_str) // 1024 if vram_str.isdigit() else 0
                    
                    # CUDA version
                    cuda_result = subprocess.run(["nvcc", "--version"], 
                                                capture_output=True, text=True, timeout=5)
                    if cuda_result.returncode == 0:
                        for line in cuda_result.stdout.split("\n"):
                            if "release" in line.lower():
                                # Парсинг версії CUDA
                                parts = line.split()
                                for i, part in enumerate(parts):
                                    if part.lower() == "release":
                                        if i + 1 < len(parts):
                                            hardware["cuda_version"] = parts[i + 1].rstrip(",")
        except Exception:
            pass  # GPU не знайдено або помилка
            
        return hardware
        
    def _get_ram_gb(self) -> int:
        """Отримання RAM в GB"""
        try:
            if platform.system() == "Linux":
                with open("/proc/meminfo") as f:
                    for line in f:
                        if line.startswith("MemTotal:"):
                            return int(line.split()[1]) // (1024 * 1024)
            elif platform.system() == "Darwin":  # macOS
                result = subprocess.run(["sysctl", "-n", "hw.memsize"], 
                                      capture_output=True, text=True)
                if result.returncode == 0:
                    return int(result.stdout.strip()) // (1024 ** 3)
        except Exception:
            pass
        return 8  # Default
        
    async def register(self):
        """Реєстрація воркера"""
        await self.connect()
        if not self.pool:
            return
            
        hardware = await self._detect_hardware()
        capabilities = {
            "max_batch": 1000,
            "max_tokens": 8192,
            "models": ["cohere/embed-multilingual-v3.0"],
            "embedding_dim": 1024,
            "supported_jobs": ["embed", "summarize", "index"]
        }
        
        async with self.pool.acquire() as conn:
            await conn.execute("""
                INSERT INTO worker_capabilities 
                    (node_id, tier, region, trust_zone, hardware, capabilities, status, last_heartbeat)
                VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
                ON CONFLICT (node_id) DO UPDATE SET
                    tier = EXCLUDED.tier,
                    region = EXCLUDED.region,
                    hardware = EXCLUDED.hardware,
                    capabilities = EXCLUDED.capabilities,
                    status = EXCLUDED.status,
                    last_heartbeat = EXCLUDED.last_heartbeat,
                    updated_at = CURRENT_TIMESTAMP
            """, self.node_id, self.tier, self.region, "internal",
               json.dumps(hardware), json.dumps(capabilities), "ready", datetime.utcnow())
            
        print(f"✅ Worker зареєстровано: {self.node_id} (Tier {self.tier})")
        
    async def update_heartbeat(self):
        """Оновлення heartbeat"""
        if not self.pool:
            return
            
        async with self.pool.acquire() as conn:
            await conn.execute("""
                UPDATE worker_capabilities
                SET last_heartbeat = CURRENT_TIMESTAMP
                WHERE node_id = $1
            """, self.node_id)
            
    async def unregister(self):
        """Видалення реєстрації"""
        if not self.pool:
            return
            
        async with self.pool.acquire() as conn:
            await conn.execute("""
                UPDATE worker_capabilities
                SET status = 'offline'
                WHERE node_id = $1
            """, self.node_id)
            
        print(f"✅ Worker видалено з реєстру: {self.node_id}")