import clsx from "clsx";
import { useEffect, useState } from "react";
import { useTranslation } from "react-i18next";
import { useQuery } from "@tanstack/react-query";
import { Search } from "lucide-react";

import { api } from "../lib/api";
import {
  ACTIVITY_TABS,
  ACTIVITY_WINDOWS,
  activityParamsToState,
  activityParamUpdates,
  type ActivityTab,
  type ActivityUrlState,
  type ActivityWindow,
} from "../lib/activityUrlState";
import { nextNavId, notifyNav, rememberNavPosition } from "../lib/history";
import { DEFAULT_LOGS_STATE, logsParamUpdates } from "../lib/logsUrlState";
import { qk } from "../lib/queryKeys";
import { useDebounced } from "../lib/useDebounced";
import { urlWithParams } from "../lib/urlState";
import { useUrlMirror } from "../lib/useUrlMirror";
import ActivityAudit from "./ActivityAudit";
import ActivityQuota from "./ActivityQuota";
import ActivityRuns from "./ActivityRuns";
import AdminLogs, { type LogPivot } from "./AdminLogs";
import FilterChipGroup from "./ui/FilterChipGroup";
import FilterSelect from "./ui/FilterSelect";
import { InnerInput } from "./ui/Input";
import { fieldClass } from "./ui/fieldStyles";
import { PageToolbar } from "./ui/PageShell";
import Tabs from "./ui/Tabs";
import { useTabPanel } from "./ui/tabPanel";

// Activity ("Napló"): what happened, in one place — the background runs, the admins' actions, the
// server's log and the quota spend, each its own table on the server, read here as four tabs under
// one filter bar (time range, account, text). The view lives in the URL, so it is a link; a pivot to
// one run's or one request's log lines is a new history entry, and Back returns to where it was made.

// A pivot shows everything the run or request logged: every other filter would only hide part of it,
// and the longest range is the log's own retention.
const PIVOT_SHARED: Pick<ActivityUrlState, "window" | "user" | "q"> = {
  window: "90d",
  user: null,
  q: "",
};

export default function Activity() {
  const { t } = useTranslation();
  const [state, setState] = useState<ActivityUrlState>(() =>
    activityParamsToState(new URLSearchParams(window.location.search)),
  );
  // Bumped when the view changes by a jump (a pivot, Back/Forward) rather than by typing: the search
  // text then applies at once instead of after the typing debounce, and the server log re-reads its
  // own filters from the address bar.
  const [jumps, setJumps] = useState(0);
  const q = useDebounced(state.q, 300, jumps);
  const panel = useTabPanel();
  // `page` too: a link to a page this one replaced (audit, logs) is rewritten to this page's id.
  useUrlMirror({ page: "activity", ...activityParamUpdates(state) });
  useEffect(() => {
    const onPop = () => {
      setJumps((n) => n + 1);
      setState(activityParamsToState(new URLSearchParams(window.location.search)));
    };
    window.addEventListener("popstate", onPop);
    return () => window.removeEventListener("popstate", onPop);
  }, []);
  const update = (patch: Partial<ActivityUrlState>) => setState((s) => ({ ...s, ...patch }));

  const pivot = (target: LogPivot) => {
    const next: ActivityUrlState = { ...state, ...PIVOT_SHARED, tab: "logs" };
    window.history.pushState(
      { ...rememberNavPosition(), sfScroll: nextNavId() },
      "",
      urlWithParams({
        page: "activity",
        ...activityParamUpdates(next),
        ...logsParamUpdates({ ...DEFAULT_LOGS_STATE, ...target }),
      }),
    );
    notifyNav();
    setJumps((n) => n + 1);
    setState(next);
  };

  const shared = { window: state.window, user: state.user, q };
  return (
    <div {...panel.panelProps(state.tab)} className="px-4 pb-4 pt-3 max-w-6xl w-full mx-auto">
      <PageToolbar>
        <div className="px-4 pt-2 max-w-6xl w-full mx-auto">
          <Tabs
            idBase={panel.idBase}
            active={state.tab}
            onChange={(tab) => update({ tab: tab as ActivityTab })}
            tabs={ACTIVITY_TABS.map((id) => ({ id, label: t(`activity.tabs.${id}`) }))}
            className="flex flex-wrap gap-1 pb-2"
          />
          <SharedBar state={state} onChange={update} />
        </div>
      </PageToolbar>
      {/* The quota tab says what its numbers are itself, beside them. */}
      {state.tab !== "quota" && (
        <p className="mb-3 text-xs leading-relaxed text-muted">
          {t(`activity.intro.${state.tab}`)}
        </p>
      )}
      {state.tab === "runs" ? (
        <ActivityRuns
          shared={shared}
          job={state.job}
          status={state.status}
          onFilter={update}
          onLogs={(runId) => pivot({ requestId: null, jobId: null, runId })}
        />
      ) : state.tab === "admin" ? (
        <ActivityAudit
          shared={shared}
          action={state.action}
          onAction={(action) => update({ action })}
          onRequest={(requestId) => pivot({ requestId, jobId: null, runId: null })}
        />
      ) : state.tab === "logs" ? (
        // Keyed by the jumps: a pivot or Back/Forward hands the log its filters through the address
        // bar, which it reads when it mounts.
        <AdminLogs key={jumps} shared={shared} onPivot={pivot} />
      ) : (
        <ActivityQuota shared={shared} />
      )}
    </div>
  );
}

/** The filters every tab shares: the text (not on the quota tab — it has nothing to match), the time
 *  range, and the account. */
function SharedBar({
  state,
  onChange,
}: {
  state: ActivityUrlState;
  onChange: (patch: Partial<ActivityUrlState>) => void;
}) {
  const { t } = useTranslation();
  const users = useQuery({ queryKey: qk.adminUsers(), queryFn: api.adminUsers });
  const known = users.data ?? [];
  // The account in use stays offered even when the list does not have it (an erased account).
  const kept =
    state.user && state.user !== "none" && !known.some((u) => String(u.id) === state.user)
      ? [{ value: state.user, label: `#${state.user}` }]
      : [];
  return (
    <div className="flex flex-wrap items-center gap-2 pb-2">
      {state.tab !== "quota" && (
        <label
          className={clsx(
            fieldClass({ size: "sm", pill: true }),
            "flex min-w-[12rem] flex-1 items-center gap-1.5",
          )}
        >
          <Search className="h-3.5 w-3.5 shrink-0 text-muted" aria-hidden />
          <InnerInput
            type="search"
            value={state.q}
            onChange={(e) => onChange({ q: e.target.value.slice(0, 200) })}
            placeholder={t("activity.search")}
            aria-label={t("activity.search")}
          />
        </label>
      )}
      <FilterChipGroup
        ariaLabel={t("activity.windowLabel")}
        value={state.window}
        onChange={(window) => onChange({ window: window as ActivityWindow })}
        options={ACTIVITY_WINDOWS.map((w) => ({ value: w, label: t(`activity.windows.${w}`) }))}
      />
      <FilterSelect
        label={t("activity.account")}
        options={[
          { value: "", label: t("activity.any") },
          { value: "none", label: t("activity.noAccount") },
          ...known.map((u) => ({ value: String(u.id), label: u.email })),
          ...kept,
        ]}
        selected={[state.user ?? ""]}
        onChange={([user]) => onChange({ user: user || null })}
        testId="activity-user"
      />
    </div>
  );
}