"""Durable follow-up that starts the first website import after Space provisioning."""

from __future__ import annotations

from celery import shared_task

from core.db.session_factory import session_factory
from models.knowledge_fs import KnowledgeFSControlSpaceState
from repositories.sqlalchemy_knowledge_fs_control_space_repository import (
    SQLAlchemyKnowledgeFSControlSpaceRepository,
)
from services.knowledge_fs.product_dto import (
    KnowledgeFSCrawlImportPayload,
    KnowledgeFSInitialWebsiteSourcePayload,
    KnowledgeFSSourceCreatePayload,
    KnowledgeFSSourceSyncPolicyPayload,
)
from services.knowledge_fs.product_remote import KnowledgeFSProductResourceNotFoundError
from services.knowledge_fs.runtime import get_knowledge_fs_runtime

_FIRECRAWL_PROVIDER_ID = "plugin-daemon-website"
_PAGE_SIZE = 200


class KnowledgeFSInitialSourceNotReadyError(RuntimeError):
    """The Space or Source workflow is still progressing and should be retried."""


def _find_initial_source(*, facade, tenant_id: str, account_id: str, control_space_id: str, request_id: str):
    cursor: str | None = None
    while True:
        response = facade.list_sources(
            tenant_id=tenant_id,
            account_id=account_id,
            control_space_id=control_space_id,
            cursor=cursor,
            limit=_PAGE_SIZE,
        )
        for source in response.data:
            if source.metadata.get("clientRequestId") == request_id:
                return source
        if not response.next_cursor:
            return None
        cursor = response.next_cursor


def _find_firecrawl_connection(*, facade, tenant_id: str, account_id: str, control_space_id: str):
    providers = facade.list_source_providers(
        tenant_id=tenant_id,
        account_id=account_id,
        control_space_id=control_space_id,
    )
    if not any(provider.id == _FIRECRAWL_PROVIDER_ID and provider.available for provider in providers.data):
        raise RuntimeError("Firecrawl provider is unavailable")

    cursor: str | None = None
    while True:
        response = facade.list_source_connections(
            tenant_id=tenant_id,
            account_id=account_id,
            control_space_id=control_space_id,
            cursor=cursor,
            limit=_PAGE_SIZE,
        )
        for connection in response.data:
            if connection.provider_id == _FIRECRAWL_PROVIDER_ID and connection.status == "active":
                return connection
        if not response.next_cursor:
            raise RuntimeError("Firecrawl connection is unavailable")
        cursor = response.next_cursor


def start_initial_website_source_import(
    *,
    tenant_id: str,
    account_id: str,
    control_space_id: str,
    operation_id: str,
    payload: KnowledgeFSInitialWebsiteSourcePayload,
) -> str:
    """Idempotently create the provisional Source and start its selected crawl import."""

    session_maker = session_factory.get_session_maker()
    with session_maker() as session:
        control_space = SQLAlchemyKnowledgeFSControlSpaceRepository(session).get(
            tenant_id=tenant_id,
            control_space_id=control_space_id,
        )
        if control_space is None:
            raise RuntimeError("KnowledgeFS control-space was not found")
        if control_space.state is not KnowledgeFSControlSpaceState.ACTIVE or control_space.knowledge_space_id is None:
            if control_space.state is KnowledgeFSControlSpaceState.PROVISIONING:
                raise KnowledgeFSInitialSourceNotReadyError("KnowledgeFS Space is still provisioning")
            raise RuntimeError(
                f"KnowledgeFS Space cannot accept an initial Source in state {control_space.state.value}"
            )

    facade = get_knowledge_fs_runtime(session_maker).facade
    request_id = f"initial-website-source:{operation_id}"
    source = _find_initial_source(
        facade=facade,
        tenant_id=tenant_id,
        account_id=account_id,
        control_space_id=control_space_id,
        request_id=request_id,
    )
    if source is None:
        connection = _find_firecrawl_connection(
            facade=facade,
            tenant_id=tenant_id,
            account_id=account_id,
            control_space_id=control_space_id,
        )
        source = facade.create_source(
            tenant_id=tenant_id,
            account_id=account_id,
            control_space_id=control_space_id,
            payload=KnowledgeFSSourceCreatePayload(
                connectionId=connection.id,
                metadata={
                    "clientRequestId": request_id,
                    "crawlOptions": {
                        "includeSubpages": payload.crawl_options.include_subpages,
                        "limit": payload.crawl_options.limit,
                    },
                    "preview": True,
                    "providerId": _FIRECRAWL_PROVIDER_ID,
                },
                name=payload.name,
                status="disabled",
                type="web",
                uri=payload.root_url,
            ),
        )

    workflow = facade.import_selected_source_crawl(
        tenant_id=tenant_id,
        account_id=account_id,
        control_space_id=control_space_id,
        source_id=source.id,
        payload=KnowledgeFSCrawlImportPayload(
            sourceUrls=[selection.source_url for selection in payload.selection],
        ),
        idempotency_key=f"{request_id}:crawl-import",
    )
    if workflow.state in {"queued", "running", "crawling", "importing", "syncing"}:
        raise KnowledgeFSInitialSourceNotReadyError("Initial website Source import is still running")
    if workflow.state != "completed":
        return workflow.id

    imported_source = facade.get_source(
        tenant_id=tenant_id,
        account_id=account_id,
        control_space_id=control_space_id,
        source_id=source.id,
    )
    try:
        current_policy = facade.get_source_sync_policy(
            tenant_id=tenant_id,
            account_id=account_id,
            control_space_id=control_space_id,
            source_id=source.id,
        )
        expected_revision = current_policy.revision
    except KnowledgeFSProductResourceNotFoundError:
        expected_revision = 0
    if payload.sync_policy == "manual":
        sync_policy = KnowledgeFSSourceSyncPolicyPayload(
            enabled=False,
            mode="manual",
            expectedRevision=expected_revision,
            expectedSourceVersion=imported_source.version,
        )
    elif payload.sync_policy == "daily":
        sync_policy = KnowledgeFSSourceSyncPolicyPayload(
            enabled=True,
            mode="interval",
            expectedRevision=expected_revision,
            expectedSourceVersion=imported_source.version,
        )
    else:
        sync_policy = KnowledgeFSSourceSyncPolicyPayload(
            enabled=True,
            mode="provider",
            expectedRevision=expected_revision,
            expectedSourceVersion=imported_source.version,
        )
    facade.update_source_sync_policy(
        tenant_id=tenant_id,
        account_id=account_id,
        control_space_id=control_space_id,
        source_id=source.id,
        payload=sync_policy,
    )
    return workflow.id


@shared_task(
    bind=True,
    queue="knowledge_fs_lifecycle",
    max_retries=180,
    default_retry_delay=2,
)
def import_initial_website_source(
    self,
    *,
    tenant_id: str,
    account_id: str,
    control_space_id: str,
    operation_id: str,
    payload: dict[str, object],
) -> str:
    try:
        return start_initial_website_source_import(
            tenant_id=tenant_id,
            account_id=account_id,
            control_space_id=control_space_id,
            operation_id=operation_id,
            payload=KnowledgeFSInitialWebsiteSourcePayload.model_validate(payload),
        )
    except KnowledgeFSInitialSourceNotReadyError as exc:
        raise self.retry(exc=exc)


__all__ = ["import_initial_website_source", "start_initial_website_source_import"]