from typing import Any

from fastapi import APIRouter, Depends, Header, Path, Query, Response
from pydantic import BaseModel

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 (
    EmptyPayload,
    EndpointPayload,
    IntentPayload,
    ItemPayload,
    NegativePayload,
    PromptPayload,
    ReleasePayload,
    ReplyPayload,
    ReviewPayload,
    RoutingPayload,
)
from app.core.advisor_backtest_contracts import AllocationBacktestQuery
from app.core.contracts import RequestContext
from app.service.admin_service import AdminService
from app.service.allocation_backtest_service import AllocationBacktestService

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


@router.post("/advisor/asset-allocation-backtests", status_code=201)
async def run_asset_allocation_backtest(
    payload: AllocationBacktestQuery,
    context: RequestContext = Depends(build_request_context),  # noqa: B008
    key: str | None = Header(default=None, alias="Idempotency-Key"),
) -> dict[str, object]:
    return await AllocationBacktestService().run(payload, context, key)


def register_resource(
    resource: str,
    schema: type[BaseModel],
    id_name: str,
    *,
    scoped: bool = False,
    update: bool = True,
    detail: bool = True,
) -> None:
    prefix = f"/config-releases/{{release_id}}/{resource}" if scoped else f"/{resource}"

    async def create(
        payload: BaseModel,
        response: Response,
        release_id: int | None = None,
        context: RequestContext = Depends(build_request_context),  # noqa: B008
        key: str | None = Header(default=None, alias="Idempotency-Key"),
    ) -> dict[str, Any]:
        result = await AdminService().mutate(
            resource, context, payload.model_dump(mode="json"), key, None, release_id=release_id
        )
        response.headers["ETag"] = f'"{result["meta"]["etag"]}"'
        return result

    create.__annotations__["payload"] = schema
    router.add_api_route(
        prefix, create, methods=["POST"], status_code=201, operation_id=f"create_{resource}"
    )

    async def list_rows(
        release_id: int | None = None,
        limit: int = Query(default=20, ge=1, le=100),
        cursor: str | None = Query(default=None),
        context: RequestContext = Depends(build_request_context),  # noqa: B008
    ) -> dict[str, Any]:
        """列表查询（文档 §3.8 统一游标）。游标校验在 Service 的权限闸门之后进行。"""
        return await AdminService().query(
            resource, context, release_id=release_id, limit=limit, cursor=cursor
        )

    router.add_api_route(prefix, list_rows, methods=["GET"], operation_id=f"list_{resource}")

    async def get(
        response: Response,
        row_id: int = Path(alias=id_name, gt=0),
        context: RequestContext = Depends(build_request_context),  # noqa: B008
    ) -> dict[str, Any]:
        result = await AdminService().query(resource, context, row_id=row_id)
        response.headers["ETag"] = f'"{result["meta"]["etag"]}"'
        return result

    if detail:
        router.add_api_route(
            f"{prefix}/{{{id_name}}}", get, methods=["GET"], operation_id=f"get_{resource}"
        )

    async def put(
        payload: BaseModel,
        response: Response,
        row_id: int = Path(alias=id_name, gt=0),
        release_id: int | None = None,
        context: RequestContext = Depends(build_request_context),  # noqa: B008
        key: str | None = Header(default=None, alias="Idempotency-Key"),
        if_match: str | None = Header(default=None, alias="If-Match"),
    ) -> dict[str, Any]:
        result = await AdminService().mutate(
            resource,
            context,
            payload.model_dump(mode="json"),
            key,
            if_match,
            row_id=row_id,
            release_id=release_id,
        )
        response.headers["ETag"] = f'"{result["meta"]["etag"]}"'
        return result

    put.__annotations__["payload"] = schema
    if update:
        router.add_api_route(
            f"{prefix}/{{{id_name}}}", put, methods=["PUT"], operation_id=f"update_{resource}"
        )


def register_transition(resource: str, id_name: str, action: str) -> None:
    async def transition(
        payload: BaseModel,
        response: Response,
        row_id: int = Path(alias=id_name, gt=0),
        context: RequestContext = Depends(build_request_context),  # noqa: B008
        key: str | None = Header(default=None, alias="Idempotency-Key"),
        if_match: str | None = Header(default=None, alias="If-Match"),
    ) -> dict[str, Any]:
        result = await AdminService().mutate(
            resource,
            context,
            payload.model_dump(mode="json"),
            key,
            if_match,
            row_id=row_id,
            action=action,
        )
        response.headers["ETag"] = f'"{result["meta"]["etag"]}"'
        return result

    transition.__annotations__["payload"] = ReviewPayload if action == "reviews" else EmptyPayload
    router.add_api_route(
        f"/{resource}/{{{id_name}}}/{action}",
        transition,
        methods=["POST"],
        status_code=201 if action == "rollbacks" else 200,
        operation_id=f"{action}_{resource}",
    )


register_resource("config-releases", ReleasePayload, "release_id", update=False)
register_resource("platform-config-items", ItemPayload, "item_id", scoped=True, detail=False)
register_resource("model-endpoints", EndpointPayload, "endpoint_id")
register_resource("model-routing-rules", RoutingPayload, "rule_id", scoped=True, detail=False)
register_resource("prompt-templates", PromptPayload, "prompt_id", update=False)
register_resource("agent-intent-configs", IntentPayload, "config_id")
register_resource("reply-templates", ReplyPayload, "template_id", detail=False)
register_resource("negative-word-rules", NegativePayload, "rule_id", detail=False)
for action in ("validations", "reviews", "activations", "rollbacks"):
    register_transition("config-releases", "release_id", action)
for action in ("reviews", "activations", "disablements"):
    register_transition("model-endpoints", "endpoint_id", action)
# 意图配置沿用同一套"审核 → 生效 → 归档"流转；归档落 `archived`
# （该表 CHECK 约束只允许 draft/approved/active/archived，没有 disabled）。
for action in ("reviews", "activations", "archivals"):
    register_transition("agent-intent-configs", "config_id", action)


@router.get("/audit-records")
async def audit_records(
    limit: int = Query(default=20, ge=1, le=100),
    cursor: str | None = Query(default=None),
    context: RequestContext = Depends(build_request_context),  # noqa: B008
) -> dict[str, Any]:
    """审计查询（文档 §9.6 支持游标过滤）。游标非法时返回 `400 INVALID_CURSOR`。"""
    return await AdminService().query("audit-records", context, limit=limit, cursor=cursor)