from typing import Any

from fastapi import APIRouter, Depends, Header
from pydantic import Field

from app.api.dependencies.auth import build_request_context
from app.api.dependencies.rate_limit import enforce_rate_limit
from app.api.schemas.admin import StrictPayload
from app.api.schemas.conversations import HandoverRequest
from app.core.contracts import RequestContext
from app.service.public_platform_service import PublicPlatformService

router = APIRouter(prefix="/api/v1", tags=["public-platform"],
                   dependencies=[Depends(enforce_rate_limit)])


class SessionCreate(StrictPayload):
    agent_type: str = Field(pattern=r"^[a-z][a-z0-9_]{1,31}$")


class Cancellation(StrictPayload):
    reason: str = Field(default="user_cancelled", max_length=128)


@router.post("/conversations", status_code=201)
async def create_session(
    payload: SessionCreate,
    key: str | None = Header(default=None, alias="Idempotency-Key"),
    context: RequestContext = Depends(build_request_context),  # noqa: B008
) -> dict[str, Any]:
    return await PublicPlatformService().write("create", "", context, key, payload.model_dump())


@router.get("/conversations/{session_id}")
async def get_session(
    session_id: str, context: RequestContext = Depends(build_request_context),  # noqa: B008
) -> dict[str, Any]:
    return await PublicPlatformService().session(session_id, context)


@router.post("/conversations/{session_id}/closures")
async def close_session(
    session_id: str, key: str | None = Header(default=None, alias="Idempotency-Key"),
    context: RequestContext = Depends(build_request_context),  # noqa: B008
) -> dict[str, Any]:
    return await PublicPlatformService().write("close", session_id, context, key, {})


@router.post("/agent-runs/{run_id}/cancellations", status_code=202)
async def cancel_run(
    run_id: str, payload: Cancellation,
    key: str | None = Header(default=None, alias="Idempotency-Key"),
    context: RequestContext = Depends(build_request_context),  # noqa: B008
) -> dict[str, Any]:
    return await PublicPlatformService().write("cancel", run_id, context, key, payload.model_dump())


@router.get("/handover-requests/{handover_id}")
async def get_handover(
    handover_id: str, context: RequestContext = Depends(build_request_context),  # noqa: B008
) -> dict[str, Any]:
    return await PublicPlatformService().handover(handover_id, context)


# 转人工申请的唯一入口：必须走 PublicPlatformService.write("handover")，
# 它在同一事务内写工单 + Outbox 事件（conversation.transfer_requested）+ 审计。
# 历史上 conversations.py 另有一份只写审计的实现，因注册顺序覆盖了本入口，
# 导致转人工的异步链路（Outbox → Worker）永不触发，已合并删除。
@router.post("/conversations/{session_id}/handover-requests", status_code=202)
async def request_handover(
    session_id: str,
    payload: HandoverRequest,
    key: str | None = Header(default=None, alias="Idempotency-Key"),
    context: RequestContext = Depends(build_request_context),  # noqa: B008
) -> dict[str, Any]:
    return await PublicPlatformService().write(
        "handover", session_id, context, key, payload.model_dump()
    )


@router.get("/users/me/memory-profile")
async def my_memory(
    context: RequestContext = Depends(build_request_context),  # noqa: B008
) -> dict[str, Any]:
    return await PublicPlatformService().memory(int(context.user_id), context)


@router.get("/customers/{customer_id}/memory-profile")
async def customer_memory(
    customer_id: int, context: RequestContext = Depends(build_request_context),  # noqa: B008
) -> dict[str, Any]:
    return await PublicPlatformService().memory(customer_id, context)