backend/config.py

"""Configuration module for Portfolio Intelligence Platform.

Loads environment variables and provides configuration settings.
"""

import os
from typing import Optional
from pydantic import Field, ConfigDict
from pydantic_settings import BaseSettings


class Settings(BaseSettings):
    """Application settings loaded from environment variables.

    Attributes:
        anthropic_api_key: Anthropic API key for Claude
        anthropic_model: Anthropic model ID (default: claude-sonnet-4-5-20250929)
        supabase_url: Supabase project URL
        supabase_key: Supabase anon key
        fmp_api_key: Financial Modeling Prep API key
        fred_api_key: FRED (Federal Reserve Economic Data) API key
        upstash_redis_url: Upstash Redis REST URL for caching
        upstash_redis_token: Upstash Redis REST token
        cache_enabled: Enable/disable caching globally
        cache_fallback_enabled: Enable in-memory fallback when Redis unavailable
        environment: Application environment (development/production)
        log_level: Logging level
    """

    # AI/LLM Configuration
    anthropic_api_key: str = Field(
        default="",
        validation_alias="ANTHROPIC_API_KEY"
    )
    anthropic_model: str = Field(
        default="claude-sonnet-4-5-20250929",
        validation_alias="ANTHROPIC_MODEL"
    )

    # Database Configuration
    supabase_url: Optional[str] = Field(
        default=None,
        validation_alias="SUPABASE_URL"
    )
    supabase_key: Optional[str] = Field(
        default=None,
        validation_alias="SUPABASE_KEY"
    )
    supabase_service_role_key: Optional[str] = Field(
        default=None,
        validation_alias="SUPABASE_SERVICE_ROLE_KEY"
    )

    # Financial Data APIs
    fmp_api_key: Optional[str] = Field(
        default=None,
        validation_alias="FMP_API_KEY"
    )
    fred_api_key: Optional[str] = Field(
        default=None,
        validation_alias="FRED_API_KEY"
    )
    finnhub_api_key: Optional[str] = Field(
        default=None,
        validation_alias="FINNHUB_API_KEY"
    )
    alpaca_api_key: Optional[str] = Field(
        default=None,
        validation_alias="ALPACA_API_KEY"
    )
    alpaca_secret_key: Optional[str] = Field(
        default=None,
        validation_alias="ALPACA_SECRET_KEY"
    )

    # Application Settings
    environment: str = Field(
        default="development",
        validation_alias="ENVIRONMENT"
    )
    log_level: str = Field(
        default="INFO",
        validation_alias="LOG_LEVEL"
    )
    app_url: str = Field(
        default="http://localhost:7860",
        validation_alias="APP_URL",
        description="Public URL where the application is accessible"
    )

    # Rate Limiting Settings
    redis_url: Optional[str] = Field(
        default=None,
        validation_alias="REDIS_URL"
    )
    rate_limit_enabled: bool = Field(
        default=True,
        validation_alias="RATE_LIMIT_ENABLED"
    )

    # Rate limit tiers (fixed window - resets daily at midnight UTC)
    # Anonymous (Demo Mode): 1 request per day
    rate_limit_anonymous_capacity: int = Field(
        default=1,
        validation_alias="RATE_LIMIT_ANONYMOUS_CAPACITY",
        description="Number of requests allowed per day for anonymous users"
    )
    rate_limit_anonymous_refill_rate: float = Field(
        default=1.0 / 86400.0,  # DEPRECATED: Not used with fixed window
        validation_alias="RATE_LIMIT_ANONYMOUS_REFILL_RATE"
    )

    # Authenticated: 3 requests per day
    rate_limit_authenticated_capacity: int = Field(
        default=3,
        validation_alias="RATE_LIMIT_AUTHENTICATED_CAPACITY",
        description="Number of requests allowed per day for authenticated users"
    )
    rate_limit_authenticated_refill_rate: float = Field(
        default=1.0 / 86400.0,  # DEPRECATED: Not used with fixed window
        validation_alias="RATE_LIMIT_AUTHENTICATED_REFILL_RATE"
    )

    # Premium: 200 requests capacity, refills at 2.0 requests/second (2 every second)
    rate_limit_premium_capacity: int = Field(
        default=200,
        validation_alias="RATE_LIMIT_PREMIUM_CAPACITY"
    )
    rate_limit_premium_refill_rate: float = Field(
        default=2.0,
        validation_alias="RATE_LIMIT_PREMIUM_REFILL_RATE"
    )

    # Market Data Provider Configuration
    market_data_provider: str = Field(
        default="yfinance",
        validation_alias="MARKET_DATA_PROVIDER"
    )
    fmp_tier: str = Field(
        default="free",
        validation_alias="FMP_TIER"
    )

    # Caching Configuration (Upstash Redis)
    upstash_redis_url: Optional[str] = Field(
        default=None,
        validation_alias="UPSTASH_REDIS_URL"
    )
    upstash_redis_token: Optional[str] = Field(
        default=None,
        validation_alias="UPSTASH_REDIS_TOKEN"
    )
    cache_enabled: bool = Field(
        default=True,
        validation_alias="CACHE_ENABLED"
    )
    cache_fallback_enabled: bool = Field(
        default=True,
        validation_alias="CACHE_FALLBACK_ENABLED"
    )
    cache_fallback_max_size: int = Field(
        default=1000,
        validation_alias="CACHE_FALLBACK_MAX_SIZE"
    )

    # Cache TTLs for different data types
    cache_ttl_quotes: int = Field(
        default=60,
        validation_alias="CACHE_TTL_QUOTES"
    )
    cache_ttl_historical: int = Field(
        default=14400,
        validation_alias="CACHE_TTL_HISTORICAL"
    )
    cache_ttl_fundamentals: int = Field(
        default=86400,
        validation_alias="CACHE_TTL_FUNDAMENTALS"
    )
    cache_ttl_ratios: int = Field(
        default=604800,
        validation_alias="CACHE_TTL_RATIOS"
    )

    # Sentry Error Monitoring
    sentry_dsn: Optional[str] = Field(
        default=None,
        validation_alias="SENTRY_DSN"
    )
    sentry_tier: str = Field(
        default="free",
        validation_alias="SENTRY_TIER"
    )
    sentry_release: Optional[str] = Field(
        default=None,
        validation_alias="SENTRY_RELEASE"
    )
    sentry_debug: bool = Field(
        default=False,
        validation_alias="SENTRY_DEBUG"
    )

    model_config = ConfigDict(
        env_file=".env",
        env_file_encoding="utf-8",
        case_sensitive=False,
    )


# Global settings instance
settings = Settings()