import { keepPreviousData, useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
import type {
  BrowserActionResult,
  BrowserControlResult,
  BrowserNavigation,
  BrowserProviderView,
  BrowserScreenshotView,
  BrowserSessionView,
  BrowserTarget,
} from "@umt/contracts";
import { apiData } from "~/lib/api.ts";
import { qk } from "~/lib/query-keys.ts";

// C1-E 原站视图:浏览器服务、站点会话、定时截图与人工输入。输入类动作要先接管(服务端校验租约)。

const AREA = "browser";

export function useBrowserProviders() {
  return useQuery({
    queryKey: qk.list(AREA, { kind: "providers" }),
    queryFn: ({ signal }) => apiData<{ items: BrowserProviderView[] }>("/browser/providers", { signal }),
    staleTime: 60_000,
  });
}

/** 站点的未关闭会话(最新的一个) */
export function useSiteBrowserSession(siteId: string, enabled = true) {
  return useQuery({
    queryKey: qk.sub(AREA, "site", siteId),
    queryFn: async ({ signal }) => {
      const r = await apiData<{ items: BrowserSessionView[] }>("/browser/sessions", { params: { siteId }, signal });
      return r.items[0] ?? null;
    },
    enabled: !!siteId && enabled,
    refetchInterval: 5_000,
  });
}

/**
 * 定时截图(1.5 秒,可暂停)。上一张保留到新图到达,避免闪烁;失败时保留旧图并在界面标"连接中断"。
 */
export function useBrowserScreenshot(sessionId: string | null, opts: { paused: boolean; intervalMs?: number }) {
  return useQuery({
    queryKey: qk.sub(AREA, "screenshot", sessionId ?? ""),
    queryFn: ({ signal }) =>
      apiData<BrowserScreenshotView>("/browser/sessions/{id}/screenshot", {
        pathParams: { id: sessionId ?? "" },
        signal,
      }),
    enabled: !!sessionId,
    refetchInterval: opts.paused ? false : (opts.intervalMs ?? 1_500),
    refetchIntervalInBackground: false,
    placeholderData: keepPreviousData,
    retry: false,
    gcTime: 0,
  });
}

function useRefresh(siteId: string) {
  const qc = useQueryClient();
  return (session?: BrowserSessionView | null) => {
    if (session !== undefined) qc.setQueryData(qk.sub(AREA, "site", siteId), session);
    void qc.invalidateQueries({ queryKey: qk.sub(AREA, "site", siteId) });
    void qc.invalidateQueries({ queryKey: qk.sub(AREA, "screenshot") });
  };
}

export function useOpenBrowserSession(siteId: string) {
  const refresh = useRefresh(siteId);
  return useMutation({
    mutationFn: () => apiData<BrowserSessionView>("/browser/sessions", { method: "POST", body: { siteId } }),
    onSuccess: (s) => refresh(s),
  });
}

export function useCloseBrowserSession(siteId: string) {
  const refresh = useRefresh(siteId);
  return useMutation({
    mutationFn: (id: string) =>
      apiData<BrowserSessionView>("/browser/sessions/{id}", { method: "DELETE", pathParams: { id } }),
    onSuccess: () => refresh(null),
  });
}

export function useBrowserControl(siteId: string) {
  const refresh = useRefresh(siteId);
  const acquire = useMutation({
    mutationFn: (id: string) =>
      apiData<BrowserControlResult>("/browser/sessions/{id}/control/acquire", {
        method: "POST",
        pathParams: { id },
        body: { reason: "原站视图接管" },
      }),
    onSuccess: (r) => refresh(r.session),
  });
  const release = useMutation({
    mutationFn: (id: string) =>
      apiData<BrowserControlResult>("/browser/sessions/{id}/control/release", {
        method: "POST",
        pathParams: { id },
        body: { reason: "原站视图交还" },
      }),
    onSuccess: (r) => refresh(r.session),
  });
  return { acquire, release };
}

export type BrowserInput =
  | { kind: "click"; target: BrowserTarget }
  | { kind: "text"; text: string; submit?: boolean }
  | { kind: "credential"; credential: "username" | "password" | "totp" }
  | { kind: "key"; key: string }
  | { kind: "scroll"; direction: "up" | "down" }
  | { kind: "navigate"; url: string }
  | { kind: "history"; action: "back" | "forward" | "reload" };

/** 人工输入:点击 / 文本 / 凭证 / 按键 / 滚动 / 导航;成功后立即刷新截图 */
export function useBrowserInput(siteId: string, sessionId: string | null) {
  const refresh = useRefresh(siteId);
  return useMutation({
    mutationFn: async (input: BrowserInput) => {
      const id = sessionId ?? "";
      const post = <T>(path: string, body: unknown) =>
        apiData<T>(`/browser/sessions/{id}/${path}`, { method: "POST", pathParams: { id }, body });
      switch (input.kind) {
        case "click":
          return (await post<BrowserActionResult>("click", { target: input.target })).session;
        case "text":
          return (await post<BrowserActionResult>("type", { text: input.text, submit: input.submit })).session;
        case "credential":
          return (await post<BrowserActionResult>("type", { credential: input.credential })).session;
        case "key":
          return (await post<BrowserActionResult>("type", { key: input.key })).session;
        case "scroll":
          return (await post<BrowserActionResult>("scroll", { direction: input.direction, amount: 600 })).session;
        case "navigate":
          return (await post<BrowserNavigation>("navigate", { url: input.url })).session;
        case "history":
          return (await post<BrowserNavigation>("navigate", { action: input.action })).session;
      }
    },
    onSuccess: (s) => refresh(s),
  });
}