"""
Core Configuration for Workers - ServiceManagerWeb

Configuración compartida entre workers usando Pydantic Settings
"""

from functools import lru_cache
from typing import List, Optional
from pydantic import Field, field_validator
from pydantic_settings import BaseSettings
import os


class WorkerSettings(BaseSettings):
    """Configuración para workers Celery."""
    
    # ===================================
    # GENERAL
    # ===================================
    ENVIRONMENT: str = Field(default="development", env="ENVIRONMENT")
    DEBUG: bool = Field(default=False, env="DEBUG")
    
    # ===================================
    # DATABASE
    # ===================================
    DATABASE_URL: str = Field(..., env="DATABASE_URL")
    
    # ===================================
    # CELERY & REDIS
    # ===================================
    CELERY_BROKER_URL: str = Field(..., env="CELERY_BROKER_URL")
    CELERY_RESULT_BACKEND: str = Field(..., env="CELERY_RESULT_BACKEND")
    REDIS_URL: str = Field(..., env="REDIS_URL")
    
    # ===================================
    # EMAIL SETTINGS
    # ===================================
    SMTP_HOST: str = Field(default="localhost", env="SMTP_HOST")
    SMTP_PORT: int = Field(default=587, env="SMTP_PORT")
    SMTP_USER: Optional[str] = Field(default=None, env="SMTP_USER")
    SMTP_PASSWORD: Optional[str] = Field(default=None, env="SMTP_PASSWORD")
    SMTP_USE_TLS: bool = Field(default=True, env="SMTP_USE_TLS")
    SMTP_USE_SSL: bool = Field(default=False, env="SMTP_USE_SSL")
    
    DEFAULT_FROM_EMAIL: str = Field(default="noreply@servicemanager.local", env="DEFAULT_FROM_EMAIL")
    DEFAULT_FROM_NAME: str = Field(default="ServiceManager", env="DEFAULT_FROM_NAME")
    
    # Email retry settings
    EMAIL_MAX_RETRIES: int = Field(default=3, env="EMAIL_MAX_RETRIES")
    EMAIL_RETRY_DELAY: int = Field(default=60, env="EMAIL_RETRY_DELAY")  # seconds
    
    # ===================================
    # FILE PROCESSING
    # ===================================
    UPLOAD_PATH: str = Field(default="/app/uploads", env="UPLOAD_PATH")
    MAX_UPLOAD_SIZE_MB: int = Field(default=10, env="MAX_UPLOAD_SIZE_MB")
    
    # ===================================
    # SLA SETTINGS
    # ===================================
    SLA_CHECK_ENABLED: bool = Field(default=True, env="SLA_CHECK_ENABLED")
    SLA_WARNING_THRESHOLD: float = Field(default=0.8, env="SLA_WARNING_THRESHOLD")  # 80% of SLA time
    
    # ===================================
    # LOGGING
    # ===================================
    LOG_LEVEL: str = Field(default="INFO", env="LOG_LEVEL")
    LOG_FORMAT: str = Field(default="json", env="LOG_FORMAT")
    LOG_FILE: Optional[str] = Field(default=None, env="LOG_FILE")
    
    # ===================================
    # MONITORING
    # ===================================
    SENTRY_DSN: Optional[str] = Field(default=None, env="SENTRY_DSN")
    PROMETHEUS_PORT: int = Field(default=8888, env="PROMETHEUS_PORT")
    
    # ===================================
    # TASK SETTINGS
    # ===================================
    TASK_TIME_LIMIT: int = Field(default=300, env="TASK_TIME_LIMIT")  # 5 minutes
    TASK_SOFT_TIME_LIMIT: int = Field(default=240, env="TASK_SOFT_TIME_LIMIT")  # 4 minutes
    
    # ===================================
    # MAINTENANCE SETTINGS
    # ===================================
    LOG_RETENTION_DAYS: int = Field(default=30, env="LOG_RETENTION_DAYS")
    ATTACHMENT_RETENTION_DAYS: int = Field(default=90, env="ATTACHMENT_RETENTION_DAYS")
    
    # ===================================
    # NOTIFICATION SETTINGS
    # ===================================
    NOTIFICATION_BATCH_SIZE: int = Field(default=100, env="NOTIFICATION_BATCH_SIZE")
    DIGEST_ENABLED: bool = Field(default=True, env="DIGEST_ENABLED")
    
    model_config = {
        "env_file": ".env",
        "env_file_encoding": "utf-8",
        "case_sensitive": True
    }
    
    def is_production(self) -> bool:
        """Check if environment is production."""
        return self.ENVIRONMENT.lower() == "production"
    
    def is_development(self) -> bool:
        """Check if environment is development."""
        return self.ENVIRONMENT.lower() == "development"


@lru_cache()
def get_settings() -> WorkerSettings:
    """
    Get cached settings instance.
    
    Using lru_cache to create a singleton pattern for settings.
    """
    return WorkerSettings()