import { keepPreviousData, useInfiniteQuery, useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
import {
  AcquisitionSlot,
  cursorPage,
  type EpisodeTotalSet,
  MediaEntity,
  Subscription,
  type SubscriptionBatch,
  SubscriptionBatchResult,
  SubscriptionCalendar,
  SubscriptionCoverage,
  type SubscriptionCreate,
  type SubscriptionGroup,
  type SubscriptionMediaKind,
  type SubscriptionOrigin,
  SubscriptionOverviewPage,
  SubscriptionProgress,
  SubscriptionResetResult,
  type SubscriptionSort,
  type SubscriptionStatus,
  type SubscriptionUpdate,
} from "@umt/contracts";
import { z } from "zod";
import { api } from "~/lib/api.ts";
import { getParsed, parseOrThrow } from "./library.ts";

// 订阅:单次收录 / 持续追踪,仅本季 / 接续后续季(REQ §6.5)

export const subscriptionKeys = {
  all: ["subscriptions"] as const,
  list: (f: SubscriptionFilters) => ["subscriptions", "list", f] as const,
  overview: (f: OverviewFilters) => ["subscriptions", "overview", f] as const,
  detail: (id: string) => ["subscriptions", "detail", id] as const,
  coverage: (id: string) => ["subscriptions", "coverage", id] as const,
  calendar: (from: string, to: string, kind?: SubscriptionMediaKind) =>
    ["subscriptions", "calendar", from, to, kind ?? ""] as const,
};

export type SubscriptionFilters = {
  status?: SubscriptionStatus;
  mediaEntityId?: string;
  mediaKind?: SubscriptionMediaKind;
  /** 标题 / 原名 / 别名 / 未建档检索词 */
  q?: string;
};

const Page = cursorPage(Subscription);

export function useSubscriptions(filters: SubscriptionFilters) {
  return useInfiniteQuery({
    queryKey: subscriptionKeys.list(filters),
    initialPageParam: undefined as string | undefined,
    queryFn: ({ pageParam, signal }) =>
      getParsed(Page, "/subscriptions", { ...filters, cursor: pageParam, limit: 50 }, signal),
    getNextPageParam: (last) => last.nextCursor ?? undefined,
    placeholderData: keepPreviousData,
  });
}

export function useCreateSubscription() {
  const qc = useQueryClient();
  return useMutation({
    mutationFn: (body: SubscriptionCreate) =>
      api.post<unknown>("/subscriptions", body).then((d) => parseOrThrow(Subscription, d, "/subscriptions")),
    onSuccess: () => {
      void qc.invalidateQueries({ queryKey: subscriptionKeys.all });
      void qc.invalidateQueries({ queryKey: ["slots"] });
      void qc.invalidateQueries({ queryKey: ["library"] });
    },
  });
}

export function useUpdateSubscription() {
  const qc = useQueryClient();
  return useMutation({
    mutationFn: ({ id, ...body }: SubscriptionUpdate & { id: string }) =>
      api.patch<unknown>(`/subscriptions/${id}`, body).then((d) => parseOrThrow(Subscription, d, "/subscriptions")),
    onSuccess: () => {
      void qc.invalidateQueries({ queryKey: subscriptionKeys.all });
      // best_version 写到收录版本的升级策略
      void qc.invalidateQueries({ queryKey: ["slots"] });
    },
  });
}

/** 订阅行上显示作品标题(旧 ID 自动跳转);按 ID 缓存 */
export function useEntityTitle(id: string | null | undefined) {
  return useQuery({
    queryKey: ["library", "entity-row", id ?? ""],
    enabled: !!id,
    staleTime: 5 * 60_000,
    queryFn: ({ signal }) => getParsed(MediaEntity, `/media-entities/${id}`, undefined, signal),
  });
}

/** 订阅进度:季总集数账本 + 每集状态(已覆盖/在途/缺失/疑似缺集)+ Slot 在途与延后(W5-C) */
export function useSubscriptionProgress(id: string | null | undefined, enabled = true) {
  return useQuery({
    queryKey: ["subscriptions", "progress", id ?? ""],
    enabled: !!id && enabled,
    queryFn: ({ signal }) => getParsed(SubscriptionProgress, `/subscriptions/${id}/progress`, undefined, signal),
  });
}

/** 手动主动搜索:按标题/别名在已开启站点搜索,结果走同一识别评估链 */
export function useSearchSubscription() {
  const qc = useQueryClient();
  return useMutation({
    mutationFn: (id: string) => api.post<{ runId: string; deduplicated: boolean }>(`/subscriptions/${id}/search`),
    onSuccess: () => void qc.invalidateQueries({ queryKey: ["subscriptions", "overview"] }),
  });
}

/** 手动设置季总集数(不锁定时只升;锁定后元数据刷新不再改写) */
export function useSetEpisodeTotal() {
  const qc = useQueryClient();
  return useMutation({
    mutationFn: ({ id, ...body }: EpisodeTotalSet & { id: string }) =>
      api
        .post<unknown>(`/subscriptions/${id}/episode-total`, body)
        .then((d) => parseOrThrow(SubscriptionProgress, d, "/subscriptions/episode-total")),
    onSuccess: (_d, v) => {
      void qc.invalidateQueries({ queryKey: ["subscriptions", "progress", v.id] });
      void qc.invalidateQueries({ queryKey: subscriptionKeys.coverage(v.id) });
      void qc.invalidateQueries({ queryKey: ["subscriptions", "overview"] });
    },
  });
}

// ── W9-E 总览 / 覆盖矩阵 / 动作(docs/runbook/subscriptions.md) ──

export type OverviewFilters = {
  mediaKind?: SubscriptionMediaKind;
  group?: SubscriptionGroup;
  sort?: SubscriptionSort;
  order?: "asc" | "desc";
  siteId?: string;
  ruleGroupId?: string;
  origin?: SubscriptionOrigin;
  upgrading?: "true" | "false";
  q?: string;
};

/** 总览:条目带分组/进度/版本徽标;counts 是当前筛选(不含 group)下各分组数量 */
export function useSubscriptionOverview(filters: OverviewFilters) {
  return useInfiniteQuery({
    queryKey: subscriptionKeys.overview(filters),
    initialPageParam: undefined as string | undefined,
    queryFn: ({ pageParam, signal }) =>
      getParsed(SubscriptionOverviewPage, "/subscriptions", { ...filters, cursor: pageParam, limit: 100 }, signal),
    getNextPageParam: (last) => last.nextCursor ?? undefined,
    placeholderData: keepPreviousData,
  });
}

export function useSubscription(id: string | undefined) {
  return useQuery({
    queryKey: subscriptionKeys.detail(id ?? ""),
    enabled: !!id,
    queryFn: ({ signal }) => getParsed(Subscription, `/subscriptions/${id}`, undefined, signal),
  });
}

/** 单条总览条目(详情页页头:进度/徽标/自动补全来源);按作品筛选后取同 id */
export function useSubscriptionOverviewItem(sub: Subscription | undefined) {
  return useQuery({
    queryKey: ["subscriptions", "overview-item", sub?.id ?? "", sub?.updatedAt ?? ""],
    enabled: !!sub,
    queryFn: async ({ signal }) => {
      const page = await getParsed(
        SubscriptionOverviewPage,
        "/subscriptions",
        {
          ...(sub!.mediaEntityId ? { mediaEntityId: sub!.mediaEntityId } : { q: sub!.titleQuery ?? undefined }),
          ...(sub!.status === "cancelled" ? { status: "cancelled" } : {}),
          limit: 100,
        },
        signal,
      );
      return page.items.find((x) => x.id === sub!.id) ?? null;
    },
  });
}

/** 覆盖矩阵;refresh() 跳过服务端 30s 缓存 */
export function useSubscriptionCoverage(id: string | undefined) {
  return useQuery({
    queryKey: subscriptionKeys.coverage(id ?? ""),
    enabled: !!id,
    queryFn: ({ signal }) => getParsed(SubscriptionCoverage, `/subscriptions/${id}/coverage`, undefined, signal),
  });
}

export function useRefreshCoverage() {
  const qc = useQueryClient();
  return useMutation({
    mutationFn: (id: string) => getParsed(SubscriptionCoverage, `/subscriptions/${id}/coverage`, { refresh: "true" }),
    onSuccess: (d, id) => qc.setQueryData(subscriptionKeys.coverage(id), d),
  });
}

function useInvalidateSubs() {
  const qc = useQueryClient();
  return () => {
    void qc.invalidateQueries({ queryKey: subscriptionKeys.all });
    void qc.invalidateQueries({ queryKey: ["slots"] });
  };
}

export type SubscriptionAction = "pause" | "resume" | "resubscribe";

/** 暂停 / 恢复 / 重新订阅 */
export function useSubscriptionAction() {
  const done = useInvalidateSubs();
  return useMutation({
    mutationFn: ({ id, action }: { id: string; action: SubscriptionAction }) =>
      api
        .post<unknown>(`/subscriptions/${id}/${action}`)
        .then((d) => parseOrThrow(Subscription, d, `/subscriptions/${action}`)),
    onSuccess: done,
  });
}

/** 批量:search / pause / resume / delete(删除 = 取消,写审计);逐条返回结果 */
export function useSubscriptionBatch() {
  const done = useInvalidateSubs();
  return useMutation({
    mutationFn: (body: SubscriptionBatch) =>
      api
        .post<unknown>("/subscriptions/batch", body)
        .then((d) => parseOrThrow(SubscriptionBatchResult, d, "/subscriptions/batch")),
    onSuccess: done,
  });
}

/** 手动补全某版本:不受自动补全开关与补全预算限制 */
export function useFillSlot() {
  const done = useInvalidateSubs();
  return useMutation({
    mutationFn: ({ id, slotId, unitKeys }: { id: string; slotId: string; unitKeys?: string[] }) =>
      api.post<{ runId: string; deduplicated: boolean }>(
        `/subscriptions/${id}/slots/${slotId}/fill`,
        unitKeys?.length ? { unitKeys } : {},
      ),
    onSuccess: done,
  });
}

/** 收录版本排序:第一个成为主版本 */
export function useSetSlotOrder() {
  const done = useInvalidateSubs();
  return useMutation({
    mutationFn: ({ id, slotIds }: { id: string; slotIds: string[] }) =>
      api
        .put<unknown>(`/subscriptions/${id}/slot-order`, { slotIds })
        .then((d) => parseOrThrow(z.array(AcquisitionSlot), d, "/subscriptions/slot-order")),
    onSuccess: done,
  });
}

/** 重置进度:取消未提交/下载已不在的计划,清延后,重评;仍在下载的保留,不删资产 */
export function useResetSubscription() {
  const done = useInvalidateSubs();
  return useMutation({
    mutationFn: (id: string) =>
      api
        .post<unknown>(`/subscriptions/${id}/reset`)
        .then((d) => parseOrThrow(SubscriptionResetResult, d, "/subscriptions/reset")),
    onSuccess: done,
  });
}

/** 日历:from / to 为 YYYY-MM-DD,跨度不超过 62 天 */
export function useSubscriptionCalendar(from: string, to: string, mediaKind?: SubscriptionMediaKind) {
  return useQuery({
    queryKey: subscriptionKeys.calendar(from, to, mediaKind),
    queryFn: ({ signal }) =>
      getParsed(SubscriptionCalendar, "/subscriptions/calendar", { from, to, mediaKind }, signal),
    placeholderData: keepPreviousData,
  });
}

/** 409 重复订阅:消息里带已有订阅 id */
export function duplicateSubscriptionId(message: string): string | null {
  const m = /已有订阅[::]\s*([0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12})/i.exec(message);
  return m?.[1] ?? null;
}