"""AI PMO workflow handlers and registry."""

from __future__ import annotations

from typing import Optional, TYPE_CHECKING

from ..models import ConversationSession, IngestEvent, Project, WorkItem
from ..schemas.world_model import WorldModel
from .ai_pmo_intent_routing import (
    INTENT_FOLLOWUP_CONTINUE,
    ROUTE_ACTION_DISCOVER,
    ROUTE_FAMILY_FOLLOWUP,
    ROUTE_FAMILY_PROJECT_CREATE,
    ROUTE_FAMILY_PROJECT_SIGNAL,
    ROUTE_FAMILY_QUERY,
    ROUTE_FAMILY_SIGNAL_SOURCE,
    CanonicalIntent,
    WorkflowRoute,
    _safe_int,
)

if TYPE_CHECKING:
    from .ai_pmo_kernel_service import AIPMOKernelService


class ContextAssembler:
    """拼装 world model 和工作流上下文，不承担执行逻辑。"""

    def __init__(self, kernel: "AIPMOKernelService") -> None:
        self.kernel = kernel

    async def assemble_world_model(
        self,
        *,
        sender: str,
        message_text: str,
        project_hint_id: Optional[int],
        session: Optional[ConversationSession],
    ) -> tuple[Optional[Project], WorldModel]:
        query_tables: set[str] = set()
        project = await self.kernel._resolve_project(
            message_text=message_text,
            project_hint_id=project_hint_id,
            query_tables=query_tables,
            session=session,
        )
        world_model = await self.kernel.build_world_model(
            tenant_id=self.kernel.tenant_id,
            project_id=_safe_int(getattr(project, "id", None)),
            sender=sender,
            project=project,
            pre_queried_tables=query_tables,
        )
        return project, world_model


class WorkflowHandler:
    """工作流处理器基类。"""

    def __init__(self, kernel: "AIPMOKernelService") -> None:
        self.kernel = kernel

    async def start(
        self,
        *,
        route: WorkflowRoute,
        intent: CanonicalIntent,
        message_text: str,
        sender: str,
        operator_user_id: Optional[int],
        source_system: str,
        source_message_id: str,
        channel_ref: Optional[str],
    ) -> dict[str, object]:
        raise NotImplementedError

    async def resume(
        self,
        *,
        route: WorkflowRoute,
        target_work_item: WorkItem,
        target_ingest: IngestEvent,
        followup_sender: str,
        operator_user_id: Optional[int],
        source_system: str,
        source_message_id: str,
        message_text: str,
        world_model: dict[str, object],
    ) -> tuple[dict[str, object], dict[str, object]]:
        return await self.kernel._resume_followup_target(
            target_work_item=target_work_item,
            target_ingest=target_ingest,
            followup_intent=CanonicalIntent(
                name=INTENT_FOLLOWUP_CONTINUE,
                confidence=0.9,
                project_id=_safe_int(target_work_item.project_id),
                signal_title="",
                signal_summary="",
                metadata={
                    "workflow_route": route.key,
                    "workflow_family": route.family,
                    "workflow_action": route.action,
                },
            ),
            followup_sender=followup_sender,
            operator_user_id=operator_user_id,
            source_system=source_system,
            source_message_id=source_message_id,
            world_model=world_model,
            message_text=message_text,
            workflow_route=route,
        )


class QueryWorkflowHandler(WorkflowHandler):
    async def start(
        self,
        *,
        route: WorkflowRoute,
        intent: CanonicalIntent,
        message_text: str,
        sender: str,
        operator_user_id: Optional[int],
        source_system: str,
        source_message_id: str,
        channel_ref: Optional[str],
    ) -> dict[str, object]:
        _ = route
        return await self.kernel.executor.execute(
            intent=intent,
            message_text=message_text,
            sender=sender,
            operator_user_id=operator_user_id,
            source_system=source_system,
            source_message_id=source_message_id,
            channel_ref=channel_ref,
        )


class ProjectCreateWorkflowHandler(WorkflowHandler):
    async def start(
        self,
        *,
        route: WorkflowRoute,
        intent: CanonicalIntent,
        message_text: str,
        sender: str,
        operator_user_id: Optional[int],
        source_system: str,
        source_message_id: str,
        channel_ref: Optional[str],
    ) -> dict[str, object]:
        _ = route
        return await self.kernel.executor.execute(
            intent=intent,
            message_text=message_text,
            sender=sender,
            operator_user_id=operator_user_id,
            source_system=source_system,
            source_message_id=source_message_id,
            channel_ref=channel_ref,
        )


class SignalSourceWorkflowHandler(WorkflowHandler):
    async def start(
        self,
        *,
        route: WorkflowRoute,
        intent: CanonicalIntent,
        message_text: str,
        sender: str,
        operator_user_id: Optional[int],
        source_system: str,
        source_message_id: str,
        channel_ref: Optional[str],
    ) -> dict[str, object]:
        _ = route
        return await self.kernel.executor.execute(
            intent=intent,
            message_text=message_text,
            sender=sender,
            operator_user_id=operator_user_id,
            source_system=source_system,
            source_message_id=source_message_id,
            channel_ref=channel_ref,
        )


class ProjectSignalWorkflowHandler(WorkflowHandler):
    async def start(
        self,
        *,
        route: WorkflowRoute,
        intent: CanonicalIntent,
        message_text: str,
        sender: str,
        operator_user_id: Optional[int],
        source_system: str,
        source_message_id: str,
        channel_ref: Optional[str],
    ) -> dict[str, object]:
        _ = sender
        _ = operator_user_id
        if route.action == ROUTE_ACTION_DISCOVER:
            return await self.kernel.executor.discover_project_signal_candidates(
                intent=intent,
                message_text=message_text,
                source_system=source_system,
                source_message_id=source_message_id,
                channel_ref=channel_ref,
            )
        return await self.kernel.executor.execute(
            intent=intent,
            message_text=message_text,
            sender=sender,
            operator_user_id=operator_user_id,
            source_system=source_system,
            source_message_id=source_message_id,
            channel_ref=channel_ref,
        )


class WorkflowRegistry:
    """按 family.action 路由处理器。"""

    def __init__(self, kernel: "AIPMOKernelService") -> None:
        self.kernel = kernel
        self._handlers: dict[str, WorkflowHandler] = {
            ROUTE_FAMILY_QUERY: QueryWorkflowHandler(kernel),
            ROUTE_FAMILY_PROJECT_CREATE: ProjectCreateWorkflowHandler(kernel),
            ROUTE_FAMILY_PROJECT_SIGNAL: ProjectSignalWorkflowHandler(kernel),
            ROUTE_FAMILY_SIGNAL_SOURCE: SignalSourceWorkflowHandler(kernel),
            ROUTE_FAMILY_FOLLOWUP: WorkflowHandler(kernel),
        }

    def get_handler(self, *, route: WorkflowRoute) -> WorkflowHandler:
        handler = self._handlers.get(route.family)
        if handler is None:
            return self._handlers[ROUTE_FAMILY_QUERY]
        return handler