import os

from pydantic import BaseModel, Field

from deerflow.config.app_config import get_app_config


class GatewayConfig(BaseModel):
    """Configuration for the API Gateway."""

    host: str = Field(default="0.0.0.0", description="Host to bind the gateway server")
    port: int = Field(default=8001, description="Port to bind the gateway server")
    cors_origins: list[str] = Field(default_factory=lambda: ["http://localhost:3000"], description="Allowed CORS origins")
    enable_docs: bool = Field(default=True, description="Enable Swagger/ReDoc/OpenAPI endpoints")


_gateway_config: GatewayConfig | None = None


def get_gateway_config() -> GatewayConfig:
    """Get gateway config, preferring the shared ``config.yaml`` settings."""
    global _gateway_config
    if _gateway_config is None:
        cors_origins_str = os.getenv("CORS_ORIGINS", "http://localhost:3000")
        try:
            # Documentation routes are part of the service surface, so the
            # versioned deployment config is authoritative.  In particular,
            # a stale shell-level GATEWAY_ENABLE_DOCS=false must not silently
            # suppress the intranet docs configured in config.yaml.
            enable_docs = get_app_config().gateway.enable_docs
        except Exception:  # noqa: BLE001 - retain the legacy env fallback if config cannot load
            enable_docs = os.getenv("GATEWAY_ENABLE_DOCS", "true").lower() == "true"
        _gateway_config = GatewayConfig(
            host=os.getenv("GATEWAY_HOST", "0.0.0.0"),
            port=int(os.getenv("GATEWAY_PORT", "8001")),
            cors_origins=cors_origins_str.split(","),
            enable_docs=enable_docs,
        )
    return _gateway_config