# /opt/docker/dev/service_finder/backend/app/core/config.py
import os
from pathlib import Path
from typing import Any, Optional, List
from pydantic_settings import BaseSettings, SettingsConfigDict
from pydantic import Field, field_validator
from sqlalchemy import text
from sqlalchemy.ext.asyncio import AsyncSession
from datetime import datetime, timezone

class Settings(BaseSettings):
    # --- Paths ---
    BASE_DIR: Path = Path(__file__).resolve().parent.parent.parent
    STATIC_DIR: str = os.path.join(str(BASE_DIR), "static")

    # --- General ---
    PROJECT_NAME: str = "Service Finder Ecosystem"
    VERSION: str = "2.1.0"
    API_V1_STR: str = "/api/v1"
    DEBUG: bool = False

    def get_now_utc_iso(self) -> str:
        """Központi időlekérdező az egész Sentinel rendszernek"""
        return datetime.now(timezone.utc).isoformat()
        
    # MB 2.0 Kompatibilitási alias a database.py számára
    @property
    def DEBUG_MODE(self) -> bool:
        return self.DEBUG

    # --- Security / JWT ---
    SECRET_KEY: str = "NOT_SET_DANGER"
    ALGORITHM: str = "HS256"
    ACCESS_TOKEN_EXPIRE_MINUTES: int = 30
    REFRESH_TOKEN_EXPIRE_DAYS: int = 7

    @field_validator('SECRET_KEY')
    @classmethod
    def validate_secret_key(cls, v: str, info) -> str:
        """Ellenőrzi, hogy a SECRET_KEY ne legyen default érték éles környezetben."""
        if v == "NOT_SET_DANGER" and not info.data.get("DEBUG", True):
            raise ValueError(
                "SECRET_KEY must be set in production environment. "
                "Please set SECRET_KEY in .env file."
            )
        if not v or v.strip() == "":
            raise ValueError("SECRET_KEY cannot be empty.")
        return v

    # --- Initial Admin ---
    INITIAL_ADMIN_EMAIL: str = "admin@servicefinder.hu"
    INITIAL_ADMIN_PASSWORD: str = "Admin123!"

    # --- Database & Cache ---
    # Alapértelmezett értéket adunk, hogy ne szálljon el, ha a .env hiányos
    DATABASE_URL: str = Field(
        default="postgresql+asyncpg://user:password@postgres-db:5432/service_finder",
        env="DATABASE_URL"
    )
    REDIS_URL: str = "redis://service_finder_redis:6379/0"

    @property
    def SQLALCHEMY_DATABASE_URI(self) -> str:
        """ 
        Ez a property biztosítja, hogy a database.py és az Alembic 
        megtalálja a kapcsolatot a várt néven.
        """
        return self.DATABASE_URL

    # --- Email ---
    EMAIL_PROVIDER: str = "auto"
    EMAILS_FROM_EMAIL: str = "info@profibot.hu"
    EMAILS_FROM_NAME: str = "Profibot"
    
    SENDGRID_API_KEY: Optional[str] = None
    SMTP_HOST: Optional[str] = None
    SMTP_PORT: int = 587
    SMTP_USER: Optional[str] = None
    SMTP_PASSWORD: Optional[str] = None

    # --- External URLs ---
    FRONTEND_BASE_URL: str = "https://dev.profibot.hu"
    BACKEND_CORS_ORIGINS: List[str] = Field(
        default=[
            "http://localhost:3001",
            "https://dev.profibot.hu"
        ],
        description="Comma-separated list of allowed CORS origins. Set via ALLOWED_ORIGINS environment variable."
    )

    @field_validator('BACKEND_CORS_ORIGINS', mode='before')
    @classmethod
    def parse_allowed_origins(cls, v: Any) -> List[str]:
        """Parse ALLOWED_ORIGINS environment variable from comma-separated string to list."""
        import os
        env_val = os.getenv('ALLOWED_ORIGINS')
        if env_val:
            # parse environment variable
            env_val = env_val.strip()
            if env_val.startswith('"') and env_val.endswith('"'):
                env_val = env_val[1:-1]
            if env_val.startswith("'") and env_val.endswith("'"):
                env_val = env_val[1:-1]
            parts = [part.strip() for part in env_val.split(',') if part.strip()]
            return parts
        # if no env variable, fallback to default or provided value
        if isinstance(v, str):
            v = v.strip()
            if v.startswith('"') and v.endswith('"'):
                v = v[1:-1]
            if v.startswith("'") and v.endswith("'"):
                v = v[1:-1]
            parts = [part.strip() for part in v.split(',') if part.strip()]
            return parts
        return v

    # --- Google OAuth ---
    GOOGLE_CLIENT_ID: str = ""
    GOOGLE_CLIENT_SECRET: str = ""
    GOOGLE_CALLBACK_URL: str = "https://dev.profibot.hu/api/v1/auth/callback/google"

    # --- Brute-Force & Security ---
    LOGIN_RATE_LIMIT_ANON: str = "5/minute"
    AUTH_MIN_PASSWORD_LENGTH: int = 8

    # --- Dinamikus Admin Motor (Sértetlenül hagyva) ---
    async def get_db_setting(self, db: AsyncSession, key_name: str, default: Any = None) -> Any:
        try:
            query = text("SELECT value FROM system.system_parameters WHERE key = :key")
            result = await db.execute(query, {"key": key_name})
            row = result.fetchone()
            if row and row[0] is not None:
                return row[0]
            return default
        except Exception:
            return default

    model_config = SettingsConfigDict(
        env_file=".env",
        env_file_encoding="utf-8",
        case_sensitive=True,
        extra="ignore"
    )

settings = Settings()