"""Factory for embedding services, including the Dograh-managed (MPS) path.

Centralizes the provider branching (Azure BYOK / Dograh-managed / OpenAI-compatible
BYOK) that was previously duplicated across document ingestion, the search route,
and the RAG tool, and resolves the MPS billing v2 protocol the same way the voice
path does: attach it only for orgs already on v2, and never create a billing
account to do so.
"""

from typing import Optional

from loguru import logger

from api.db.db_client import DBClient

from .azure_openai_service import AzureOpenAIEmbeddingService
from .base import BaseEmbeddingService
from .dograh_service import DograhEmbeddingService
from .openai_service import OpenAIEmbeddingService

DEFAULT_EMBEDDING_MODEL = "text-embedding-3-small"
DEFAULT_AZURE_API_VERSION = "2024-02-15-preview"


async def resolve_embedding_correlation_id(
    *,
    organization_id: Optional[int],
    service_key: Optional[str],
    created_by: Optional[str] = None,
) -> Optional[str]:
    """Resolve an MPS correlation id for a managed embedding call made outside a run.

    Mirrors the voice path's gating:

    - OSS deployments use a pasted hosted v2 key (v2 by definition), so mint
      directly via the bearer endpoint — matching ``_authorize_oss_managed_v2_correlation``.
    - Hosted/SaaS: read the org's billing mode (no side effects) and mint only when
      it is already v2. Minting for an already-v2 org is a no-op on the account.

    Returns ``None`` when the call should be sent without the protocol; MPS accepts
    un-gated embedding calls from v1 orgs. Never creates a v2 billing account.
    """
    if not service_key:
        return None

    # Imported lazily to avoid import-time cycles between the gen_ai and service
    # layers (matches the inline-import convention used elsewhere in the app).
    from api.constants import DEPLOYMENT_MODE
    from api.services.mps_service_key_client import mps_service_key_client

    try:
        if DEPLOYMENT_MODE == "oss":
            minted = await mps_service_key_client.create_correlation_id(
                service_key=service_key
            )
            return minted.get("correlation_id")

        if organization_id is None:
            return None

        status = await mps_service_key_client.get_billing_account_status(
            organization_id, created_by=created_by
        )
        if not status or status.get("billing_mode") != "v2":
            return None

        minted = await mps_service_key_client.create_correlation_id(
            service_key=service_key
        )
        return minted.get("correlation_id")
    except Exception as e:
        logger.warning(
            "Could not resolve MPS correlation id for managed embeddings; "
            "sending without v2 protocol: {}",
            e,
        )
        return None


async def build_embedding_service(
    *,
    db_client: DBClient,
    provider: Optional[str],
    api_key: Optional[str],
    model: Optional[str],
    base_url: Optional[str] = None,
    endpoint: Optional[str] = None,
    api_version: Optional[str] = None,
    correlation_id: Optional[str] = None,
    organization_id: Optional[int] = None,
    created_by: Optional[str] = None,
    resolve_correlation: bool = False,
) -> BaseEmbeddingService:
    """Construct the right embedding service for a provider/config.

    Args:
        correlation_id: A correlation id already available in context (e.g. the
            running workflow's MPS correlation id). Used for the Dograh provider.
        resolve_correlation: When True and no ``correlation_id`` is supplied, resolve
            one for the Dograh provider via ``resolve_embedding_correlation_id``
            (for calls made outside a workflow run: ingestion, manual search).
    """
    from api.services.configuration.registry import ServiceProviders

    model_id = model or DEFAULT_EMBEDDING_MODEL

    if provider == ServiceProviders.AZURE.value and endpoint:
        return AzureOpenAIEmbeddingService(
            db_client=db_client,
            api_key=api_key,
            endpoint=endpoint,
            model_id=model_id,
            api_version=api_version or DEFAULT_AZURE_API_VERSION,
        )

    if provider == ServiceProviders.DOGRAH.value:
        cid = correlation_id
        if cid is None and resolve_correlation:
            cid = await resolve_embedding_correlation_id(
                organization_id=organization_id,
                service_key=api_key,
                created_by=created_by,
            )
        return DograhEmbeddingService(
            db_client=db_client,
            api_key=api_key,
            model_id=model_id,
            base_url=base_url,
            correlation_id=cid,
        )

    return OpenAIEmbeddingService(
        db_client=db_client,
        api_key=api_key,
        model_id=model_id,
        base_url=base_url,
    )