import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
import {
  cursorPage,
  type FeedHealth,
  FeedSource,
  type FeedSourceCreate,
  type FeedSourceUpdate,
  Id,
} from "@umt/contracts";
import { z } from "zod";
import { TTL_SECOND } from "~/lib/api.ts";
import { apiMutate, apiParsed, cleanParams } from "./parse.ts";

// Feed 来源(W2-B:/feed-sources)

const FeedPage = cursorPage(FeedSource);

export const feedKeys = {
  all: ["feeds"] as const,
  list: (f: { siteId?: string; health?: FeedHealth }) => ["feeds", "list", f] as const,
};

export function useFeeds(f: { siteId?: string; health?: FeedHealth } = {}) {
  return useQuery({
    queryKey: feedKeys.list(f),
    queryFn: ({ signal }) =>
      apiParsed(FeedPage, "/api/v1/feed-sources", { params: cleanParams({ ...f, limit: 200 }), signal }),
    refetchInterval: 30 * TTL_SECOND,
  });
}

export function useCreateFeed() {
  const qc = useQueryClient();
  return useMutation({
    mutationFn: (body: FeedSourceCreate) =>
      apiMutate("/api/v1/feed-sources", { body }).then((d) => FeedSource.parse(d)),
    onSuccess: () => qc.invalidateQueries({ queryKey: feedKeys.all }),
  });
}

export function useUpdateFeed() {
  const qc = useQueryClient();
  return useMutation({
    mutationFn: ({ id, body }: { id: string; body: FeedSourceUpdate }) =>
      apiMutate("/api/v1/feed-sources/:id", { method: "PATCH", pathParams: { id }, body }).then((d) =>
        FeedSource.parse(d),
      ),
    onSuccess: () => qc.invalidateQueries({ queryKey: feedKeys.all }),
  });
}

/** 启停 / 熔断复位 */
export function useFeedAction() {
  const qc = useQueryClient();
  return useMutation({
    mutationFn: ({ id, action }: { id: string; action: "enable" | "disable" | "reset" }) =>
      apiMutate(`/api/v1/feed-sources/:id/${action}`, { pathParams: { id } }).then((d) => FeedSource.parse(d)),
    onSuccess: () => qc.invalidateQueries({ queryKey: feedKeys.all }),
  });
}

/** 立即抓取(仍受站点限流),返回任务 ID */
export function useFetchFeedNow() {
  const qc = useQueryClient();
  return useMutation({
    mutationFn: (id: string) =>
      apiMutate("/api/v1/feed-sources/:id/fetch", { pathParams: { id } }).then((d) =>
        z.object({ taskId: Id }).parse(d),
      ),
    onSuccess: () => qc.invalidateQueries({ queryKey: feedKeys.all }),
  });
}

/**
 * 疑似缺口:Feed 窗口与上次零重叠时服务端发 feed.gap_suspected 并排补漏。
 * 列表字段里没有显式标记,这里按 cursor 里的 gapSuspectedAt(若服务端写入)或"距上次成功超过 3 个周期"推断,并标"疑似"。
 */
export function feedGapHint(f: FeedSource, now = Date.now()): string | null {
  const gapAt = typeof f.cursor.gapSuspectedAt === "string" ? f.cursor.gapSuspectedAt : null;
  if (gapAt) return `疑似缺口(${new Date(gapAt).toLocaleString("zh-CN", { hour12: false })} 检测,已排补漏)`;
  if (!f.enabled || !f.lastSuccessAt) return null;
  const gapMs = now - new Date(f.lastSuccessAt).getTime();
  if (gapMs > f.pollIntervalSec * 1000 * 3) return "距上次成功已超过 3 个周期,可能漏项(疑似)";
  return null;
}