// <Root> — root of the Preact rewrite. Wires `Header` + `StatusChips`
// to the real `/api/state` snapshot via `useAgentState`. Covers
// everything `app.js` did, including the `needs_login_idle`/
// `needs_login_in_progress` recovery flow (`LoginFlow`) — an agent with
// no credentials has no other web-UI path back online, so this isn't
// optional polish.
import { useEffect, useRef, useState } from "preact/hooks";
import type { BadgeTone } from "@hive/shared/badge.js";
import { SettingsMenu } from "@hive/shared/settings-menu.js";
import { useApplyThemeOverride } from "@hive/shared/theme-apply.js";
import { useApplyMotionOverride } from "@hive/shared/motion-apply.js";
import { Header } from "./components/Header.js";
import { MetaNav } from "./components/MetaNav.js";
import { ExpandDetailsSetting } from "./components/ExpandDetailsSetting.js";
import { HideDebugSetting } from "./components/HideDebugSetting.js";
import { StatusChips } from "./components/StatusChips.js";
import { LiveStream, type LiveStreamHandle } from "./components/LiveStream.js";
import { HeaderPill } from "./components/HeaderPill.js";
import { SidePanel } from "./components/SidePanel.js";
import { InboxPanel } from "./components/InboxPanel.js";
import { TodosPanel } from "./components/TodosPanel.js";
import { TermInput } from "./components/TermInput.js";
import { LoginFlow } from "./components/LoginFlow.js";
import { useAgentState } from "./hooks/useAgentState.js";
import { useTodos } from "./hooks/useTodos.js";
import { fmtAge, fmtTokens } from "./lib/format.js";
import { resolveDashboardBase } from "./lib/dashboardBase.js";
import { submitPauseResume } from "./lib/pauseAction.js";
import { postModel, postEffort } from "./lib/modelEffort.js";
import { postCancelTurn } from "./lib/termActions.js";
import type { TokenUsage } from "./types.js";

type OpenPanel = "inbox" | "todos" | null;

// Storage keys this page owns for `@hive/shared`'s settings mechanism —
// kept here, not derived, so `useApplyThemeOverride`/`useApplyMotionOverride`
// (mounted once below) and `<SettingsMenu>` (in `pills`, further down)
// always agree on which browser-local key they're reading/writing.
const THEME_KEY = "agent:theme-override";
const MOTION_KEY = "agent:motion-override";

const ALIVE_LABELS: Record<
  string,
  { glyph: string; text: string; tone: BadgeTone }
> = {
  online: { glyph: "●", text: "alive", tone: "positive" },
  rate_limited: { glyph: "⊘", text: "rate limited", tone: "warning" },
  needs_login_idle: { glyph: "◌", text: "needs login", tone: "warning" },
  needs_login_in_progress: { glyph: "◌", text: "logging in", tone: "warning" },
};
const STATE_LABELS: Record<
  string,
  { glyph: string; text: string; tone: BadgeTone }
> = {
  idle: { glyph: "💤", text: "idle", tone: "neutral" },
  thinking: { glyph: "🧠", text: "thinking", tone: "accent" },
  compacting: { glyph: "📦", text: "compacting", tone: "warning" },
};
const STATE_TOOLTIPS: Record<string, string> = {
  offline: "harness unreachable or claude not logged in",
  idle: "turn loop running, no claude invocation in flight",
  thinking: "claude is executing the current turn",
  compacting: "operator-triggered /compact running on the persistent session",
};

// `total` here matches app.js's `renderOneUsage` exactly: input + both
// cache buckets, output_tokens deliberately excluded (it's shown in the
// title breakdown, not folded into the headline number).
function tokenTotal(u: TokenUsage | null): number | null {
  if (!u) return null;
  return (
    (u.input_tokens ?? 0) +
    (u.cache_read_input_tokens ?? 0) +
    (u.cache_creation_input_tokens ?? 0)
  );
}

export function Root() {
  useApplyThemeOverride(THEME_KEY);
  useApplyMotionOverride(MOTION_KEY);
  const { state, refresh } = useAgentState();
  const { todos, refresh: refreshTodos } = useTodos();
  const [openPanel, setOpenPanel] = useState<OpenPanel>(null);
  const liveStreamRef = useRef<LiveStreamHandle>(null);

  // Ticks the status badge's "thinking Xm Ys" age once a second,
  // independent of the ~4s `/api/state` poll cadence — without its own
  // clock the age text only advances when a poll happens to land, so it
  // visibly stair-steps instead of counting up, and freezes outright for
  // however long a poll is delayed (e.g. a backgrounded tab).
  const [now, setNow] = useState(() => Date.now());
  useEffect(() => {
    const id = setInterval(() => setNow(Date.now()), 1000);
    return () => clearInterval(id);
  }, []);

  // Browser tab title — ports app.js's setHeader logic verbatim: prefer
  // the human display name + hive_name ("iris // pr1ma") so tabs read
  // naturally; fall back to the qualified domain label for multi-hive
  // disambiguation when hive_name is unset, then to plain label for
  // single-hive deploys. Without this every agent's tab reads the
  // static index.html <title> forever — can't tell tabs apart with
  // several open.
  useEffect(() => {
    if (!state) return;
    const tab =
      state.qualified_label && state.qualified_label !== state.label
        ? state.qualified_label
        : state.label;
    document.title = state.hive_name
      ? `${state.label} // ${state.hive_name}`
      : `${tab} // hyperhive`;
  }, [state?.label, state?.qualified_label, state?.hive_name]);
  const termInput = (
    <footer class="agent-composer">
      <TermInput
        label={state?.label ?? "…"}
        online={state?.status === "online"}
        onLocalNote={(text) => liveStreamRef.current?.pushNote(text)}
        onClear={() => liveStreamRef.current?.clear()}
      />
    </footer>
  );

  const pills = (
    <>
      <HeaderPill
        kind="inbox"
        icon="📬"
        label="inbox"
        count={state?.inbox.length ?? 0}
        onClick={() => setOpenPanel("inbox")}
      />
      <HeaderPill
        kind="todos"
        icon="📋"
        label="todos"
        count={todos.length}
        onClick={() => setOpenPanel("todos")}
      />
      {/* Needs a loaded snapshot for its data (links/forge_public_url,
       * dashboard_port) — omitted until the first /api/state resolves,
       * same as the old page's populateOverflowMenu (now deleted —
       * dashboard-link moved here, rebuild removed outright, see
       * MetaNav.tsx's file comment). */}
      {state ? (
        <MetaNav
          links={state.links}
          forgePublicUrl={state.forge_public_url}
          dashboardBase={resolveDashboardBase(state.dashboard_port)}
        />
      ) : null}
      <SettingsMenu themeKey={THEME_KEY} motionKey={MOTION_KEY}>
        <ExpandDetailsSetting />
        <HideDebugSetting />
      </SettingsMenu>
    </>
  );
  // Kept mounted regardless of `openPanel` (open/closed toggles just the
  // `open` prop) rather than conditionally rendering the whole
  // component — SidePanel's slide/fade CSS transitions only fire on a
  // class change after mount, not on an already-open initial render, so
  // mount-on-open would skip both the open AND the close animation.
  const panelTitle =
    openPanel === "inbox"
      ? `inbox · ${state?.inbox.length ?? 0}`
      : openPanel === "todos"
        ? `todos · ${todos.length}`
        : "";
  const panel = (
    <SidePanel
      open={openPanel !== null}
      title={panelTitle}
      onClose={() => setOpenPanel(null)}
    >
      {openPanel === "inbox" ? (
        <InboxPanel
          rows={state?.inbox ?? []}
          label={state?.label ?? ""}
          dashboardBase={
            state ? resolveDashboardBase(state.dashboard_port) : ""
          }
          onCleared={refresh}
        />
      ) : openPanel === "todos" ? (
        <TodosPanel todos={todos} onCleared={refreshTodos} />
      ) : null}
    </SidePanel>
  );

  if (!state) {
    return (
      <>
        <Header label="…" pills={pills}>
          <StatusChips
            statusLabel="… connecting"
            statusTone="neutral"
            model=""
            availableModels={[]}
            onSelectModel={() => {}}
            effort=""
            availableEfforts={[]}
            onSelectEffort={() => {}}
            paused={false}
            onTogglePause={() => {}}
            thinking={false}
            onCancelTurn={() => Promise.resolve()}
          />
        </Header>
        <main className="agent-main">
          <LiveStream ref={liveStreamRef} />
        </main>
        {termInput}
        {panel}
      </>
    );
  }

  const alive = ALIVE_LABELS[state.status] ?? {
    glyph: "○",
    text: "offline",
    tone: "negative" as BadgeTone,
  };
  // Mirrors app.js's refreshState: any non-'online' status forces the
  // turn-state badge to 'offline' regardless of the server's last-known
  // turn_state (login/rate-limit takes visual priority over a stale
  // idle/thinking reading from before the harness went offline).
  const effectiveTurnState =
    state.status === "online" ? state.turn_state : "offline";
  const turnDef = STATE_LABELS[effectiveTurnState] ?? {
    glyph: "○",
    text: "offline",
    tone: "negative" as BadgeTone,
  };
  const stateAge = fmtAge(now - state.turn_state_since * 1000);
  // Consolidated status badge (mara: "why do we have separate alive
  // badge? ... one badge that shows thinking / idle / paused").
  // Not online → the alive-table's own reading (rate-limited/needs-login/
  // offline), no age (nothing to age). Online + paused → 'paused'
  // overrides the turn-state reading, since a paused agent won't be
  // thinking regardless of its last turn_state. Online + running →
  // turn-state + age, same as before.
  const primaryStatus =
    state.status !== "online"
      ? {
          glyph: alive.glyph,
          text: alive.text,
          tone: alive.tone,
          tooltip: undefined as string | undefined,
        }
      : state.paused
        ? {
            glyph: "⏸",
            text: "paused",
            tone: "warning" as BadgeTone,
            tooltip: undefined,
          }
        : {
            glyph: turnDef.glyph,
            text: `${turnDef.text} · ${stateAge}`,
            tone: turnDef.tone,
            tooltip: STATE_TOOLTIPS[effectiveTurnState],
          };
  const ctx = tokenTotal(state.ctx_usage);
  const cost = tokenTotal(state.cost_usage);

  return (
    <>
      <Header
        label={state.label}
        hiveLabel={
          [state.swarm_name, state.hive_name].filter(Boolean).join(" / ") ||
          null
        }
        pills={pills}
      >
        <StatusChips
          statusLabel={`${primaryStatus.glyph} ${primaryStatus.text}`}
          statusTone={primaryStatus.tone}
          statusTooltip={primaryStatus.tooltip}
          model={state.model}
          resolvedModel={state.resolved_model ?? undefined}
          availableModels={state.available_models}
          onSelectModel={(name) => {
            postModel(name).then(() => refresh());
          }}
          effort={state.effort}
          availableEfforts={state.available_efforts}
          onSelectEffort={(level) => {
            postEffort(level).then(() => refresh());
          }}
          ctxLabel={ctx !== null ? fmtTokens(ctx) : undefined}
          costLabel={cost !== null ? fmtTokens(cost) : undefined}
          paused={state.paused}
          onTogglePause={() => {
            submitPauseResume(
              resolveDashboardBase(state.dashboard_port),
              state.label,
              state.paused ? "resume" : "pause",
            ).then(() => refresh());
          }}
          thinking={effectiveTurnState === "thinking"}
          onCancelTurn={() =>
            postCancelTurn().then((r) => {
              if (!r.ok)
                liveStreamRef.current?.pushNote(
                  `✗ /cancel failed${r.detail ? ": " + r.detail : ""}`,
                );
              refresh();
            })
          }
        />
      </Header>
      <main className="agent-main">
        {state.status === "needs_login_idle" ||
        state.status === "needs_login_in_progress" ? (
          <LoginFlow
            status={state.status}
            session={state.session}
            onRefresh={refresh}
          />
        ) : null}
        <LiveStream ref={liveStreamRef} />
      </main>
      {termInput}
      {panel}
    </>
  );
}