"""Application configuration using Pydantic Settings."""

from functools import lru_cache
from typing import Optional

from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict


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

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

    # Database (port 5434 to avoid conflict with Hub Postgres and other services)
    DATABASE_URL: str = "postgresql+asyncpg://orchestrator:orchestrator@localhost:5434/orchestrator"

    # Application
    DEBUG: bool = False
    APP_NAME: str = "LetsBe Orchestrator"
    APP_VERSION: str = "0.1.0"

    # Connection pool settings
    DB_POOL_SIZE: int = 5
    DB_MAX_OVERFLOW: int = 10
    DB_POOL_TIMEOUT: int = 30
    DB_POOL_RECYCLE: int = 1800

    # Authentication
    # Admin API key for protected endpoints (registration token management)
    # MUST be set via ADMIN_API_KEY environment variable
    ADMIN_API_KEY: str = Field(
        description="API key for admin endpoints. MUST be set via ADMIN_API_KEY env var.",
    )

    # ============================================================
    # LOCAL MODE SETTINGS
    # When LOCAL_MODE=true, orchestrator runs in single-tenant mode
    # with automatic tenant bootstrap on startup.
    # When LOCAL_MODE=false (default), multi-tenant behavior is unchanged.
    # ============================================================
    LOCAL_MODE: bool = Field(
        default=False,
        description="Enable single-tenant local mode. When true, auto-creates tenant on startup.",
    )

    # Instance identification (from Hub activation)
    INSTANCE_ID: Optional[str] = Field(
        default=None,
        description="Unique instance identifier from Hub activation. Required in LOCAL_MODE.",
    )

    # Hub integration for telemetry (optional)
    HUB_URL: Optional[str] = Field(
        default=None,
        description="Hub API URL for telemetry. Optional even in LOCAL_MODE.",
    )
    HUB_API_KEY: Optional[str] = Field(
        default=None,
        description="Hub API key for telemetry authentication. Required if HUB_URL is set.",
    )
    HUB_TELEMETRY_ENABLED: bool = Field(
        default=False,
        description="Whether to send telemetry to Hub. Requires HUB_URL and HUB_API_KEY.",
    )
    HUB_TELEMETRY_INTERVAL_SECONDS: int = Field(
        default=60,
        ge=10,
        le=600,
        description="Interval between telemetry submissions in seconds.",
    )

    # Local tenant settings (used when LOCAL_MODE=true)
    LOCAL_TENANT_DOMAIN: str = Field(
        default="local.letsbe.cloud",
        description="Domain for auto-created local tenant.",
    )

    # CORS
    CORS_ALLOWED_ORIGINS: str = Field(
        default="",
        description="Comma-separated list of allowed CORS origins. Empty disables CORS.",
    )

    # Dedicated key for local agent registration (Phase 2)
    # More restrictive than ADMIN_API_KEY - can ONLY register the local agent
    LOCAL_AGENT_KEY: Optional[str] = Field(
        default=None,
        description="Key for local agent registration. Required when LOCAL_MODE=true.",
    )


@lru_cache
def get_settings() -> Settings:
    """Get cached settings instance."""
    return Settings()


# For backward compatibility
settings = get_settings()