import { MoonStar, PackageOpen, Pencil, ShieldCheck, Sparkles, Square, Terminal, UserRoundMinus, UserRoundPlus, WandSparkles } from "lucide-react";
import { type FormEvent, useCallback, useEffect, useMemo, useState } from "react";

import { platformApiClient } from "../api/client";
import type {
  ConfigDiffLineResponse,
  GamePluginResponse,
  JobResponse,
  ServerInstanceResponse,
  ServerMemberResponse,
  ServerMetricsResponse,
  ServerDeploymentResponse,
  ServerConfigDiffPreviewResponse,
  RunEndpointResponse
} from "../api/types";
import { ConfirmDialog, UsageMeter } from "../components/OperationControls";
import { ServerManagementTerminalDrawer } from "../components/ServerManagementTerminalDrawer";
import { EmptyState, ErrorState, LoadingState, ResultBadge } from "../components/StateViews";
import type { PageComponentProps } from "../contracts/page";
import { canStartServer, canStopServer, runtimeObservationFreshness, serverMetadataFormFromInstance, type ServerMetadataFormState } from "../contracts/serverManagement";
import {
  serverDetailSections,
  serverIsOnline,
  type ConfigDiffView,
  type LlmSuggestionView,
  type ServerDetailSection
} from "../contracts/workspace";
import {
  serverLifecycleCommandRequest,
  serverMetadataUpdateRequestFromForm
} from "../schemas/serverManagement";
import { cx } from "../utils/classes";
import { stateLabel, statusClass } from "./ServersPage";
import { PluginPageHostPage } from "./PluginPageHostPage";

type LoadState<T> = { status: "loading" } | { status: "error"; reason: string } | { status: "ready"; data: T };

const serverDetailRefreshMs = 5000;
const serverMetricFreshMs = 30000;

export function ServerDetailPage(props: PageComponentProps) {
  const { session, params, operations, onNavigate } = props;
  const serverId = params.serverId ?? "";
  const [section, setSection] = useState<ServerDetailSection>("manage");
  const [instance, setInstance] = useState<LoadState<ServerInstanceResponse>>({ status: "loading" });
  const [metrics, setMetrics] = useState<ServerMetricsResponse | null>(null);
  const [plugins, setPlugins] = useState<GamePluginResponse[]>([]);
  const [jobs, setJobs] = useState<JobResponse[]>([]);
  const [runEndpoint, setRunEndpoint] = useState<RunEndpointResponse | undefined>();
  const [deployment, setDeployment] = useState<LoadState<ServerDeploymentResponse>>({ status: "loading" });
  const [confirm, setConfirm] = useState<null | { title: string; description: string; danger?: boolean; run: () => Promise<void> }>(null);
  const [confirmBusy, setConfirmBusy] = useState(false);
  const [terminalOpen, setTerminalOpen] = useState(false);

  const refresh = useCallback(async () => {
    if (!serverId) {
      setInstance({ status: "error", reason: "缺少服务器 ID" });
      return;
    }
    setInstance({ status: "loading" });
    try {
      const [detail, pluginResponse, jobResponse, deploymentResponse, endpointResponse] = await Promise.all([
        platformApiClient.getServerInstance(serverId),
        platformApiClient.listGamePlugins(),
        platformApiClient.listJobs(serverId),
        platformApiClient
          .getServerDeployment(serverId)
          .then((data): LoadState<ServerDeploymentResponse> => ({ status: "ready", data }))
          .catch((error): LoadState<ServerDeploymentResponse> => ({ status: "error", reason: error instanceof Error ? error.message : "部署定义加载失败" })),
        platformApiClient.listRunEndpoints().catch(() => ({ items: [], count: 0 }))
      ]);
      setInstance({ status: "ready", data: detail });
      setPlugins(pluginResponse.items);
      setJobs(jobResponse.items);
      setDeployment(deploymentResponse);
      setRunEndpoint(endpointResponse.items.find((endpoint) => endpoint.id === detail.runEndpointId));
    } catch (error) {
      setInstance({ status: "error", reason: error instanceof Error ? error.message : "加载失败" });
      setRunEndpoint(undefined);
      setDeployment({ status: "error", reason: "部署定义加载失败" });
    }
    try {
      const metricsResponse = await platformApiClient.listServerMetrics();
      setMetrics(metricsResponse.items.find((item) => item.serverInstanceId === serverId) ?? null);
    } catch {
      setMetrics(null);
    }
  }, [serverId]);

  useEffect(() => {
    void refresh();
  }, [refresh]);

  const refreshOperationalState = useCallback(async () => {
    if (!serverId) return;
    try {
      const [detail, jobResponse, metricsResponse, endpointResponse] = await Promise.all([
        platformApiClient.getServerInstance(serverId),
        platformApiClient.listJobs(serverId),
        platformApiClient.listServerMetrics(),
        platformApiClient.listRunEndpoints()
      ]);
      setInstance({ status: "ready", data: detail });
      setJobs(jobResponse.items);
      setMetrics(metricsResponse.items.find((item) => item.serverInstanceId === serverId) ?? null);
      setRunEndpoint(endpointResponse.items.find((endpoint) => endpoint.id === detail.runEndpointId));
    } catch {
      setMetrics(null);
    }
  }, [serverId]);

  useEffect(() => {
    const timer = window.setInterval(() => void refreshOperationalState(), serverDetailRefreshMs);
    return () => window.clearInterval(timer);
  }, [refreshOperationalState]);

  const canManageServers = session.capabilities.includes("servers.manage");
  const readyPlugin = instance.status === "ready" ? plugins.find((plugin) => plugin.id === instance.data.pluginId) : undefined;
  const detailFreshness = instance.status === "ready" ? runtimeObservationFreshness(instance.data, runEndpoint) : "unverified";
  const detailStateText = instance.status === "ready" && detailFreshness === "fresh" ? stateLabel(instance.data.state) : instance.status === "ready" ? `最后观测：${stateLabel(instance.data.state)}（Run 未验证）` : "未验证";
  const detailSections = useMemo(() => serverDetailSectionEntries(readyPlugin), [readyPlugin]);
  const metricsWaiting = metrics?.source === "run-metrics-pending";

  useEffect(() => {
    if (!params.routeKey || !readyPlugin?.pages.some((page) => page.key === params.routeKey)) return;
    setSection(`plugin:${params.routeKey}`);
  }, [params.routeKey, readyPlugin]);

  useEffect(() => {
    if (detailSections.some((entry) => entry.id === section)) return;
    setSection(detailSections[0]?.id ?? "manage");
  }, [detailSections, section]);

  function requestLifecycle(current: ServerInstanceResponse, action: "start" | "stop") {
    setConfirm({
      title: action === "start" ? "启动服务器" : "停止服务器",
      description:
        action === "start"
          ? `确认启动服务器 ${current.name}（${current.id}）？`
          : `停止服务器 ${current.name}（${current.id}）会断开所有在线玩家，确认继续？`,
      danger: action === "stop",
      run: async () => {
        const operationId = operations.begin({
          intent: action === "start" ? "启动服务器" : "停止服务器",
          targetKind: "server",
          targetId: current.id,
          requester: session.displayName
        });
        try {
          const result =
            action === "start"
              ? await platformApiClient.startServerInstance(current.id, serverLifecycleCommandRequest(current, "start"))
              : await platformApiClient.stopServerInstance(current.id, serverLifecycleCommandRequest(current, "stop"));
          operations.succeed(operationId, `任务 ${result.job.id}（${result.job.capability}）已派发`, result.job);
          await refresh();
        } catch (error) {
          operations.fail(operationId, error instanceof Error ? error.message : "操作失败", operationId);
        }
      }
    });
  }

  if (!serverId) {
    return (
      <EmptyState title="未选择服务器" description="请从服务器列表进入详情页。" actionLabel="返回服务器列表" onAction={() => onNavigate("servers")} />
    );
  }

  return (
    <section className="server-detail-page" aria-labelledby="server-detail-title">
      <div className="action-strip">
        <button type="button" className="icon-command" onClick={() => onNavigate("servers")}>
          <MoonStar size={16} />
          <span>返回列表</span>
        </button>
        <button type="button" className="icon-command" onClick={() => void refresh()}>
          <Sparkles size={16} />
          <span>刷新</span>
        </button>
      </div>

      {instance.status === "loading" && <LoadingState label="正在加载服务器详情…" />}
      {instance.status === "error" && (
        <ErrorState title="服务器详情加载失败" reason={instance.reason} diagnosticId={`server-detail:${serverId}`} onRetry={() => void refresh()} />
      )}

      {instance.status !== "ready" && (
        <nav className="section-tabs" aria-label="server sections">
          {detailSections.map((entry) => (
            <button
              key={entry.id}
              type="button"
              className={cx("section-tab", section === entry.id && "section-tab-active")}
              aria-current={section === entry.id ? "page" : undefined}
              onClick={() => setSection(entry.id)}
            >
              {entry.label}
            </button>
          ))}
        </nav>
      )}

      {instance.status === "ready" && (
        <>
          <header className="server-detail-header">
            <div className="server-detail-title-row">
              <div>
                <h1 id="server-detail-title">{instance.data.name}</h1>
                <span className="provider-id">
                  {instance.data.id} · 插件 {instance.data.pluginId}@{instance.data.pluginVersion} · Run 心跳 {runEndpoint ? "已自动附着" : "等待上报"}
                </span>
              </div>
              <div className="action-strip">
                <span className={cx("status-pill", detailFreshness === "fresh" ? statusClass(instance.data.state) : "status-disabled")}>{detailStateText}</span>
                <button
                  type="button"
                  className="icon-command"
                  disabled={!canManageServers}
                  title={canManageServers ? "打开终端" : "当前账号没有管理权限"}
                  onClick={() => setTerminalOpen(true)}
                >
                  <Terminal size={15} />
                  <span>打开终端</span>
                </button>
                <button
                  type="button"
                  className="icon-command"
                  disabled={!canStartServer(instance.data.state) || operations.isPending(instance.data.id, "启动服务器")}
                  onClick={() => requestLifecycle(instance.data, "start")}
                >
                  <WandSparkles size={15} />
                  <span>启动</span>
                </button>
                <button
                  type="button"
                  className="icon-command danger-command"
                  disabled={!canStopServer(instance.data.state) || operations.isPending(instance.data.id, "停止服务器")}
                  onClick={() => requestLifecycle(instance.data, "stop")}
                >
                  <Square size={15} />
                  <span>停止</span>
                </button>
              </div>
            </div>
            <div className="server-detail-stat-strip">
              <HeaderStat label="状态" value={detailFreshness === "fresh" ? (serverIsOnline(instance.data.state) ? "在线" : "离线") : "未验证"} />
              <HeaderStat label="玩家" value={metrics?.playerCount !== undefined ? `${metrics.playerCount}${metrics.maxPlayers ? `/${metrics.maxPlayers}` : ""}` : "--"} />
              <HeaderStat label="TPS" value={metrics?.tps !== undefined ? metrics.tps.toFixed(1) : "--"} />
              <HeaderStat label="延迟" value={metrics?.latencyMs !== undefined ? `${Math.round(metrics.latencyMs)}ms` : "--"} />
              <HeaderStat label="指标" value={metricFreshnessLabel(metrics)} />
            </div>
            <div className="server-detail-meter-strip">
              <UsageMeter label="CPU" percent={metrics?.cpuPercent} pending={metricsWaiting} />
              <UsageMeter label="内存" percent={metrics?.memoryPercent} pending={metricsWaiting} />
              <UsageMeter label="磁盘" percent={metrics?.diskPercent} pending={metricsWaiting} />
            </div>
          </header>

          <nav className="section-tabs" aria-label="server sections">
            {detailSections.map((entry) => (
              <button
                key={entry.id}
                type="button"
                className={cx("section-tab", section === entry.id && "section-tab-active")}
                aria-current={section === entry.id ? "page" : undefined}
                onClick={() => setSection(entry.id)}
              >
                {entry.label}
              </button>
            ))}
          </nav>

          {pluginPageKeyFromSection(section) && readyPlugin && <PluginPageSection pageProps={props} serverId={serverId} plugin={readyPlugin} routeKey={pluginPageKeyFromSection(section) ?? ""} />}
          {section === "manage" && <ServerDeploymentSection instance={instance.data} deployment={deployment} />}
          {section === "manage" && (
            <ServerMetadataSection
              instance={instance.data}
              session={session}
              operations={operations}
              onChanged={(next) => setInstance({ status: "ready", data: next })}
            />
          )}
          {section === "manage" && <ServerAdministratorsSection instance={instance.data} session={session} onChanged={(next) => setInstance({ status: "ready", data: next })} />}
          {section === "llm" && <LlmSection serverId={serverId} instance={instance.data} session={session} operations={operations} />}
          <ServerManagementTerminalDrawer open={terminalOpen} serverId={instance.data.id} serverName={instance.data.name} pluginId={instance.data.pluginId} canManage={canManageServers} onClose={() => setTerminalOpen(false)} />
        </>
      )}

      <ConfirmDialog
        open={confirm !== null}
        title={confirm?.title ?? ""}
        description={confirm?.description ?? ""}
        confirmLabel="确认执行"
        danger={confirm?.danger}
        busy={confirmBusy}
        onCancel={() => setConfirm(null)}
        onConfirm={() => {
          if (!confirm) {
            return;
          }
          setConfirmBusy(true);
          void confirm.run().finally(() => {
            setConfirmBusy(false);
            setConfirm(null);
          });
        }}
      />
    </section>
  );
}

function serverDetailSectionEntries(plugin?: GamePluginResponse): Array<{ id: ServerDetailSection; label: string }> {
  const pluginPages = (plugin?.pages ?? []).map((page) => ({ id: `plugin:${page.key}` as ServerDetailSection, label: page.title }));
  return [...pluginPages, ...serverDetailSections];
}

function pluginPageKeyFromSection(section: ServerDetailSection): string | null {
  return section.startsWith("plugin:") ? section.slice("plugin:".length) : null;
}

interface PluginPageSectionProps {
  pageProps: PageComponentProps;
  serverId: string;
  plugin: GamePluginResponse;
  routeKey: string;
}

function PluginPageSection({ pageProps, serverId, plugin, routeKey }: PluginPageSectionProps) {
  const params = useMemo(() => ({ ...pageProps.params, pluginId: plugin.id, routeKey, serverId }), [pageProps.params.pluginId, pageProps.params.routeKey, pageProps.params.serverId, plugin.id, routeKey, serverId]);
  return <PluginPageHostPage {...pageProps} params={params} initialPlugin={plugin} embedded />;
}

interface ServerMetadataSectionProps {
  instance: ServerInstanceResponse;
  session: PageComponentProps["session"];
  operations: PageComponentProps["operations"];
  onChanged: (instance: ServerInstanceResponse) => void;
}

function ServerMetadataSection({ instance, session, operations, onChanged }: ServerMetadataSectionProps) {
  const [draft, setDraft] = useState<ServerMetadataFormState>(() => serverMetadataFormFromInstance(instance));
  const [result, setResult] = useState<{ status: "succeeded" | "failed" | "pending"; label: string } | null>(null);

  useEffect(() => {
    setDraft(serverMetadataFormFromInstance(instance));
  }, [instance.id, instance.name]);

  async function saveMetadata(event: FormEvent<HTMLFormElement>) {
    event.preventDefault();
    const operationId = operations.begin({ intent: "更新服务器信息", targetKind: "server", targetId: instance.id, requester: session.displayName });
    setResult({ status: "pending", label: "正在保存服务器信息" });
    try {
      const updated = await platformApiClient.updateServerInstance(instance.id, serverMetadataUpdateRequestFromForm(draft));
      onChanged(updated);
      operations.succeed(operationId, `服务器信息已更新：${updated.id}`);
      setResult({ status: "succeeded", label: `已更新 ${updated.name}` });
    } catch (error) {
      operations.fail(operationId, error instanceof Error ? error.message : "服务器信息更新失败");
      setResult({ status: "failed", label: error instanceof Error ? error.message : "服务器信息更新失败" });
    }
  }

  return (
    <article className="console-panel" aria-label="server metadata">
      <div className="panel-header">
        <h2>
          <Pencil size={16} style={{ verticalAlign: "-2px" }} /> 基本信息
        </h2>
        {result && <ResultBadge status={result.status} label={result.label} />}
      </div>
      <form className="provider-form" style={{ marginTop: 12 }} onSubmit={(event) => void saveMetadata(event)}>
        <label>
          显示名称
          <input value={draft.name} onChange={(event) => setDraft((current) => ({ ...current, name: event.target.value }))} />
        </label>
        <div className="action-strip">
          <button type="submit" className="primary-command" disabled={draft.name.trim() === instance.name}>
            <Pencil size={14} />
            <span>保存名称</span>
          </button>
        </div>
      </form>
    </article>
  );
}

interface ServerDeploymentSectionProps {
	instance: ServerInstanceResponse;
	deployment: LoadState<ServerDeploymentResponse>;
}

function ServerDeploymentSection({ instance, deployment }: ServerDeploymentSectionProps) {
	if (deployment.status === "loading") return <LoadingState label="正在加载部署定义…" compact />;
	if (deployment.status === "error") return <ErrorState title="部署定义不可用" reason={deployment.reason} diagnosticId={`deployment:${instance.id}`} compact />;
	const view = deployment.data;
	const projection = view.projection;
	const isScumTemplate = (instance.pluginId === "game.scum" && (view.mode === "guided-install" || view.mode === "existing-server")) || projection?.templateKey?.startsWith("scum-");
	return <article className="console-panel" aria-label="server deployment">
		<div className="panel-header"><h2><PackageOpen size={16} style={{ verticalAlign: "-2px" }} /> 部署定义</h2><span className="page-status">{view.mode || "未配置"} · 修订 {view.revision}</span></div>
		<p className="section-copy">服务器目录是主目录；执行目录只用于高级自定义启动，留空时继承服务器目录。路径和命令均为受保护输入，不会回显。</p>
		<div className="console-row-list"><div className="console-row"><span>服务器目录</span><strong>{view.serverRootConfigured ? "已配置" : "未配置"}</strong></div><div className="console-row"><span>高级执行目录</span><strong>{view.workingDirectoryConfigured ? "已配置" : "使用服务器目录"}</strong></div><div className="console-row"><span>启动设置</span><strong>{view.startCommandConfigured ? "已配置" : view.mode === "custom-command" ? "未配置" : "插件引导"}</strong></div>{view.latestDispatch && <div className="console-row"><span>最近 Run 调度</span><strong>{view.latestDispatch.deploymentDefinitionIncluded ? `部署定义已随任务发送 · r${view.latestDispatch.deploymentRevision} · ${view.latestDispatch.jobState}` : "未携带部署定义"}</strong></div>}{view.latestDispatch?.runConfirmed && <div className="console-row"><span>Run 执行确认</span><strong>已按 r{view.latestDispatch.deploymentRevision} 确认执行</strong></div>}</div>
		{isScumTemplate && <div className="console-row-list" style={{ marginTop: 12 }}><div className="console-row"><span>SCUM 部署模板</span><strong>{projection?.templateVersion ? `${projection.templateKey ?? "已选择"} · v${projection.templateVersion}` : "等待 Run 预检"}</strong></div><div className="console-row"><span>预检 / 扫描</span><strong>{deploymentProjectionLabel(projection?.preflightState)} / {deploymentProjectionLabel(projection?.discoveryState)}</strong></div><div className="console-row"><span>配置映射 / 健康验证</span><strong>{deploymentProjectionLabel(projection?.mappingState)} / {deploymentProjectionLabel(projection?.verificationState)}</strong></div>{projection?.failureCode && <div className="console-row"><span>失败原因</span><strong>{projection.failureCode}</strong></div>}</div>}
	</article>;
}

function deploymentProjectionLabel(value?: string): string {
	switch (value) {
		case "queued": return "排队中";
		case "running": return "执行中";
		case "passed": return "已通过";
		case "applied": return "已写入";
		case "unchanged": return "未变化";
		case "failed": return "失败";
		case "skipped": return "已跳过";
		default: return "待返回";
	}
}

function deploymentProgressLabel(progress: JobResponse["progress"]): string {
	switch (progress.phase) {
		case "queued": return "任务已排队，等待 Run 领取";
		case "claimed": return "Run 已领取任务";
		case "preflight": return "正在执行本机预检";
		case "install": return "正在安装服务器";
		case "configure": return "正在写入游戏配置";
		case "start": return "正在启动服务器";
		case "health": return "正在进行健康检查";
		default: return "部署任务已提交";
	}
}

interface ServerAdministratorsSectionProps {
  instance: ServerInstanceResponse;
  session: PageComponentProps["session"];
  onChanged: (instance: ServerInstanceResponse) => void;
}

function ServerAdministratorsSection({ instance, session, onChanged }: ServerAdministratorsSectionProps) {
  const [candidates, setCandidates] = useState<LoadState<ServerMemberResponse[]>>({ status: "loading" });
  const [selectedUserId, setSelectedUserId] = useState("");
  const [busyUserId, setBusyUserId] = useState<string | null>(null);
  const [result, setResult] = useState<{ status: "succeeded" | "failed"; label: string } | null>(null);
  const isOwner = instance.ownerUserId === session.id;

  const refreshCandidates = useCallback(async () => {
    if (!isOwner) {
      setCandidates({ status: "ready", data: [] });
      return;
    }
    setCandidates({ status: "loading" });
    try {
      const response = await platformApiClient.listServerAdministratorCandidates(instance.id);
      setCandidates({ status: "ready", data: response.items });
      setSelectedUserId((current) => (response.items.some((user) => user.id === current) ? current : response.items[0]?.id ?? ""));
    } catch (error) {
      setCandidates({ status: "error", reason: error instanceof Error ? error.message : "加载候选管理员失败" });
    }
  }, [instance.id, isOwner]);

  useEffect(() => {
    void refreshCandidates();
  }, [refreshCandidates]);

  async function addAdministrator(event: FormEvent<HTMLFormElement>) {
    event.preventDefault();
    if (!selectedUserId) {
      return;
    }
    setBusyUserId(selectedUserId);
    setResult(null);
    try {
      const next = await platformApiClient.addServerAdministrator(instance.id, { userId: selectedUserId });
      onChanged(next);
      setResult({ status: "succeeded", label: "已添加服务器管理员" });
      await refreshCandidates();
    } catch (error) {
      setResult({ status: "failed", label: error instanceof Error ? error.message : "添加管理员失败" });
    } finally {
      setBusyUserId(null);
    }
  }

  async function removeAdministrator(userId: string) {
    setBusyUserId(userId);
    setResult(null);
    try {
      const next = await platformApiClient.removeServerAdministrator(instance.id, userId);
      onChanged(next);
      setResult({ status: "succeeded", label: "已移除服务器管理员" });
      await refreshCandidates();
    } catch (error) {
      setResult({ status: "failed", label: error instanceof Error ? error.message : "移除管理员失败" });
    } finally {
      setBusyUserId(null);
    }
  }

  return (
    <article className="console-panel" aria-label="server administrators">
      <div className="panel-header">
        <h2>
          <ShieldCheck size={16} style={{ verticalAlign: "-2px" }} /> 管理成员
        </h2>
        <span className="page-status">{isOwner ? "服主可邀请/移除管理员" : "仅服主可调整成员"}</span>
      </div>
      {result && (
        <div style={{ marginBottom: 10 }}>
          <ResultBadge status={result.status} label={result.label} />
        </div>
      )}
      <div className="action-list">
        <span>服主：{instance.ownerUserId || "未绑定"}</span>
        <span>服务器管理员：{instance.adminUserIds.length > 0 ? instance.adminUserIds.join(" / ") : "暂无"}</span>
      </div>
      {isOwner && (
        <>
          <form className="provider-form" style={{ marginTop: 12 }} onSubmit={(event) => void addAdministrator(event)} aria-label="邀请服务器管理员">
            <div className="form-grid">
              <label>
                邀请管理员
                <select value={selectedUserId} onChange={(event) => setSelectedUserId(event.target.value)} disabled={candidates.status !== "ready" || candidates.data.length === 0}>
                  {candidates.status === "ready" && candidates.data.length === 0 && <option value="">暂无可邀请用户</option>}
                  {candidates.status === "ready" &&
                    candidates.data.map((user) => (
                      <option key={user.id} value={user.id}>
                        {user.displayName}（{user.email ?? user.id}）
                      </option>
                    ))}
                </select>
              </label>
            </div>
            {candidates.status === "loading" && <LoadingState label="正在加载可邀请用户…" compact />}
            {candidates.status === "error" && (
              <ErrorState title="候选管理员加载失败" reason={candidates.reason} diagnosticId={`server-admin-candidates:${instance.id}`} onRetry={() => void refreshCandidates()} compact />
            )}
            <button type="submit" className="primary-command" disabled={!selectedUserId || busyUserId !== null}>
              <UserRoundPlus size={14} />
              <span>{busyUserId === selectedUserId ? "邀请中…" : "邀请为管理员"}</span>
            </button>
          </form>
          {instance.adminUserIds.length > 0 && (
            <div className="resource-list" style={{ marginTop: 12 }}>
              {instance.adminUserIds.map((userId) => (
                <article key={userId} className="resource-list-item">
                  <span>
                    <strong>{userId}</strong>
                    <span className="provider-id">服务器管理员</span>
                  </span>
                  <button type="button" className="theme-upload" disabled={busyUserId !== null} onClick={() => void removeAdministrator(userId)}>
                    <UserRoundMinus size={13} />
                    <span>{busyUserId === userId ? "移除中…" : "移除"}</span>
                  </button>
                </article>
              ))}
            </div>
          )}
        </>
      )}
    </article>
  );
}

function HeaderStat({ label, value }: { label: string; value: string }) {
  return (
    <span className="server-card-stat">
      <span>{label}</span>
      <strong>{value}</strong>
    </span>
  );
}

function metricFreshnessLabel(metrics: ServerMetricsResponse | null): string {
  if (!metrics || metrics.source === "run-metrics-pending") return "等待上报";
  const collectedAt = new Date(metrics.collectedAt).getTime();
  if (Number.isFinite(collectedAt) && Date.now() - collectedAt > serverMetricFreshMs) return "指标过期";
  return new Date(metrics.collectedAt).toLocaleTimeString();
}

interface LlmSectionProps {
  serverId: string;
  instance: ServerInstanceResponse;
  session: PageComponentProps["session"];
  operations: PageComponentProps["operations"];
}

function LlmSection({ serverId, instance, session, operations }: LlmSectionProps) {
  const [prompt, setPrompt] = useState("");
  const [suggestion, setSuggestion] = useState<LlmSuggestionView | null>(null);
  const [confirming, setConfirming] = useState(false);
  const [busy, setBusy] = useState(false);
  const [approvalBusy, setApprovalBusy] = useState(false);
  const [suggestionError, setSuggestionError] = useState("");

  async function requestSuggestion(event: FormEvent<HTMLFormElement>) {
    event.preventDefault();
    if (!prompt.trim()) {
      return;
    }
    setBusy(true);
    setSuggestion(null);
    setSuggestionError("");
    try {
      const response = await platformApiClient.invokeAI({ requestId: `web:ai.config:${serverId}:${Date.now()}`, serverInstanceId: serverId, purpose: "config.suggest", prompt: prompt.trim() });
      if (response.status !== "ok") {
        throw new Error(response.error?.message ?? "AI 提供商未返回可用建议");
      }
      const recommendation = response.configRecommendation;
      setSuggestion({
        serverInstanceId: serverId,
        source: "api",
        recommendation: response.recommendation ?? "Platform 已返回配置建议。",
        diffId: recommendation?.diffId,
        expiresAt: recommendation?.expiresAt,
        diffSummary: recommendation?.diffSummary
      });
    } catch (caught) {
      setSuggestionError(caught instanceof Error ? caught.message : "AI 建议请求失败");
    } finally {
      setBusy(false);
    }
  }

  async function applySuggestion() {
    if (!suggestion?.diffId || approvalBusy) {
      return;
    }
    const operationId = operations.begin({ intent: "应用 AI 配置建议", targetKind: "llm", targetId: serverId, requester: session.displayName });
    setApprovalBusy(true);
    try {
      const approved = await platformApiClient.approveAIConfigDiff(suggestion.diffId, `web:ai.config.approve:${suggestion.diffId}`);
      const job = approved.dispatch.job;
      operations.succeed(operationId, `AI 建议已确认，写入任务 ${job.id} 已派发`, job);
      setSuggestion(null);
      setConfirming(false);
    } catch (error) {
      operations.fail(operationId, error instanceof Error ? error.message : "写入任务派发失败", operationId);
      setConfirming(false);
    } finally {
      setApprovalBusy(false);
    }
  }

  const llmOperation = operations.operations.find((operation) => operation.intent === "应用 AI 配置建议" && operation.targetId === serverId);

  return (
    <article className="console-panel" aria-label="llm configuration assistance">
      <div className="panel-header">
        <h2>
          <Sparkles size={16} style={{ verticalAlign: "-2px" }} /> AI 配置助手
        </h2>
        <span className="page-status">建议仅作用于 {serverId}</span>
      </div>
      <p style={{ margin: "0 0 12px", color: "var(--ink-soft)", fontSize: 13.5 }}>
        AI 建议会先生成推荐说明和配置差异，<strong>不会自动写入</strong>。只有你确认差异后，平台才会派发写入任务。前端不会接触任何 AI 提供商密钥。
      </p>
      {llmOperation && (
        <div style={{ marginBottom: 10 }}>
          <ResultBadge
            status={llmOperation.status}
            label={
              llmOperation.status === "pending"
                ? "写入中…"
                : llmOperation.status === "succeeded"
                  ? (llmOperation.message ?? "已派发")
                  : `失败：${llmOperation.errorReason}（诊断 ${llmOperation.diagnosticId}）`
            }
          />
        </div>
      )}
      {suggestionError && <ErrorState title="AI 建议不可用" reason={suggestionError} diagnosticId={`ai-config:${serverId}`} onRetry={() => setSuggestionError("")} compact />}
      <form className="provider-form" style={{ border: 0, padding: 0 }} onSubmit={(event) => void requestSuggestion(event)}>
        <label>
          想让 AI 帮你调整什么？
          <textarea
            value={prompt}
            rows={3}
            placeholder="例如：把最大玩家数提高到 40，并关闭 PVP"
            onChange={(event) => setPrompt(event.target.value)}
          />
        </label>
        <button type="submit" className="primary-command" disabled={busy || !prompt.trim()}>
          {busy ? "生成建议中…" : "生成建议"}
        </button>
      </form>

      {suggestion && (
        <div style={{ display: "grid", gap: 12, marginTop: 14 }}>
          <div className="panel-header" style={{ marginBottom: 0 }}>
            <h3>AI 建议</h3>
            <span className="page-status">平台 AI Provider</span>
          </div>
          <p style={{ margin: 0, color: "var(--ink-soft)", fontSize: 14 }}>{suggestion.recommendation}</p>
          {suggestion.diffId ? (
            <>
              <div className="console-record">
                <div className="console-record-head"><strong>Reviewable AI diff</strong><span className="status-pill status-active">pending</span></div>
                <div className="console-record-meta"><span>Diff {suggestion.diffId}</span>{suggestion.expiresAt && <span>到期 {new Date(suggestion.expiresAt).toLocaleString()}</span>}</div>
                <span className="provider-id">{suggestion.diffSummary ?? "平台已保存可审查配置差异；批准后才会派发写入任务。"}</span>
              </div>
              <div className="confirm-actions">
                <button type="button" onClick={() => setSuggestion(null)}>
                  放弃建议
                </button>
                <button type="button" className="confirm-primary" onClick={() => setConfirming(true)}>
                  审批 AI 差异
                </button>
              </div>
            </>
          ) : (
            <span className="provider-id">该建议没有生成可应用的配置差异，仅供参考。</span>
          )}
        </div>
      )}

      <ConfirmDialog
        open={confirming}
        title="确认应用 AI 配置建议"
        description={`即将向服务器 ${instance.name}（${serverId}）派发配置写入任务。写入内容以上方差异为准。`}
        confirmLabel="确认写入"
        busy={approvalBusy || llmOperation?.status === "pending"}
        onCancel={() => setConfirming(false)}
        onConfirm={() => void applySuggestion()}
      />
    </article>
  );
}

export function configDiffViewFromPreview(preview: ServerConfigDiffPreviewResponse): ConfigDiffView {
  const lines = preview.diff.map(configDiffLineFromPreviewLine);
  const added = lines.filter((line) => line.kind === "added").length;
  const removed = lines.filter((line) => line.kind === "removed").length;
  return {
    serverInstanceId: preview.serverInstanceId,
    configVersion: preview.configVersion,
	checksum: preview.checksum,
    key: preview.key,
    source: preview.source,
    summary: `+${added} / -${removed} 行变更`,
    lines,
    nextContent: preview.proposedContent ?? "",
    proposedContentInputRef: preview.proposedContentInputRef
  };
}

function configDiffLineFromPreviewLine(line: ConfigDiffLineResponse): ConfigDiffView["lines"][number] {
  return {
    kind: line.kind === "context" ? "same" : line.kind,
    text: line.content
  };
}