/**
 * 治理台外壳 —— 一份壳,两个台面(设计中心 / 运营中心)。
 *
 * 左轨(本台面的区)→ 顶栏 → 面包屑 → 区首页(页签 + 主视图)/ 整页下钻。
 * 「**不用抽屉、不用弹窗**:每一层内容都有自己的页面。」
 *
 * 两台面差的只是**区表与首页**,皮肤与骨架同一套 —— 故不复制一个壳,而是把台面当参数。
 * 区归属、入口亮灯一律读 `surfaces.ts`,壳自己不作主张。
 *
 * §9.2「路由状态即应用状态」:台面 / 区 / 页签 / 下钻栈全部编码进 URL 的 hash,
 * 刷新与深链都能完整还原;前端零过程状态。
 */
import { useCallback, useEffect, useState } from 'react';
import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
import type { Session } from '@contracts';
import { logoutRoute, sessionRoute } from '@contracts';
import { call } from '@web-shared/typed-fetch.ts';
import { Ico } from '@web-shared/Ico.tsx';
import { TABS, ZM, ZONES, routeLabel } from '@web-shared/gov/gov-route.ts';
import type { GovZone, Nav, Route } from '@web-shared/gov/gov-route.ts';
import { SURFACE_META, SURFACE_ZONES, canSeeSurface } from '@web-shared/gov/surfaces.ts';
import type { Surface } from '@web-shared/gov/surfaces.ts';
import { useGovObjects, useGovTasks } from '@web-shared/gov/gov-api.ts';
import { domainShort, sortDomains } from '@web-shared/gov/domains.ts';
import { queryKeys } from './query.ts';
import { BlueprintHome } from '@features/gov-blueprint';
import { TasksHome, TaskLogPage, TaskPage, WfPage } from '@features/gov-task';
import { RunsHome } from '@features/gov-runs';
import { EmpPage, PeopleHome, RolePage } from '@features/gov-staff';
import { PkgPage, WorkflowsHome } from '@features/gov-process';
import { TriggerPage, TriggerRulesHome } from '@features/gov-trigger';
import { ActPage, LibraryHome } from '@features/gov-activity';
import { ToolPage, ToolsHome } from '@features/gov-tool';
import { DataHome, LedgersHome, ObjPage } from '@features/gov-data';
import { ArchiveHome } from '@features/gov-archive';
import { TestbedHome } from '@features/gov-testbed';
import { CockpitHome } from '@features/gov-memory';
import { ChanPage, LlmPage, ModelsHome, SystemHome } from '@features/gov-system';
import { Btn } from '@web-shared/Btn.tsx';

/* ── URL 编解码:`#/<surface>/<zone>/<tab>[/<k>:<id>…]` ────────────────── */

type Place = { zone: GovZone; tab: string; stack: Route[] };

function readPlace(surface: Surface): Place {
  const raw = window.location.hash.replace(/^#\/?/, '');
  const parts = raw.split('/').filter((s) => s !== '');
  // 区限定在**本台面**的区表内:越界(旧链接、手改地址)落回本台首区,不串台
  const zones = SURFACE_ZONES[surface];
  const zone = zones.find((z) => z === parts[1]) ?? zones[0]!;
  const tabs = TABS[zone];
  // 台账区的页签是数据域(动态生成),静态表里没有 —— 认不出就原样收下,别兜到不存在的首签
  const tab = tabs.find((t) => t.key === parts[2])?.key ?? tabs[0]?.key ?? (parts[2] ?? '');
  const stack: Route[] = [];
  for (const seg of parts.slice(3)) {
    const at = seg.indexOf(':');
    if (at <= 0) continue;
    stack.push({ k: seg.slice(0, at), id: decodeURIComponent(seg.slice(at + 1)) } as Route);
  }
  return { zone, tab, stack };
}

const writePlace = (surface: Surface, p: Place): string =>
  ['#', surface, p.zone, p.tab, ...p.stack.map((r) => `${r.k}:${encodeURIComponent(r.id)}`)].join('/');

export function GovShell({ surface }: { surface: Surface }) {
  const [place, setPlace] = useState<Place>(() => readPlace(surface));
  const session = useQuery({ queryKey: queryKeys.session, queryFn: () => call<Session>(sessionRoute) });
  // 运行态的两份数据只在运营中心取:设计中心不看运行数字(纪律),也不必替它要
  const tasks = useGovTasks({ enabled: surface === 'ops' });
  const objects = useGovObjects({ enabled: surface === 'ops' });
  const queryClient = useQueryClient();

  /** 登出后整体清空缓存 —— 治理台看到的是全组织数据,更不能留给下一个人 */
  const logout = useMutation({
    mutationFn: () => call<{ ok: boolean }>(logoutRoute),
    onSuccess: () => {
      queryClient.clear();
      // 整页导航:SSE 连接、组件状态、路由位置一并归零 —— 登出不留残影
      window.location.assign('/');
    },
  });

  // 浏览器前进 / 后退即导航 —— 路由状态就是应用状态
  useEffect(() => {
    const onHash = () => setPlace(readPlace(surface));
    window.addEventListener('hashchange', onHash);
    return () => window.removeEventListener('hashchange', onHash);
  }, [surface]);

  const go = useCallback(
    (next: Place) => {
      window.location.hash = writePlace(surface, next);
      setPlace(next);
    },
    [surface],
  );

  const push = useCallback(
    (r: Route) => {
      const p = readPlace(surface);
      go({ ...p, stack: [...p.stack, r] });
    },
    [go, surface],
  );
  const back = useCallback(() => {
    const p = readPlace(surface);
    go({ ...p, stack: p.stack.slice(0, -1) });
  }, [go, surface]);
  const goZone = useCallback((z: GovZone) => go({ zone: z, tab: TABS[z][0]?.key ?? '', stack: [] }), [go]);
  const jump = useCallback((z: GovZone, tab: string, r?: Route) => go({ zone: z, tab, stack: r ? [r] : [] }), [go]);
  const nav: Nav = { push, jump };

  // Esc 退一级 —— 与面包屑同义
  useEffect(() => {
    const h = (e: KeyboardEvent) => {
      if (e.key === 'Escape') back();
    };
    window.addEventListener('keydown', h);
    return () => window.removeEventListener('keydown', h);
  }, [back]);

  const { zone, tab, stack } = place;
  const meta = ZM[zone];
  const top = stack[stack.length - 1];
  const me = session.data?.staff;
  const other: Surface = surface === 'design' ? 'ops' : 'design';

  /** 告警计数:异常工作流 + 非放行终态的任务 —— 只有运营中心管这个 */
  const alerts =
    (tasks.data?.workflows ?? []).filter((w) => w.state === 'abnormal').length +
    (tasks.data?.tasks ?? []).filter((t) => t.terminal !== undefined && t.terminal !== 'released').length;

  /** 台账的域页签按**已有域**长出来 —— 设计侧一发布新域,台账里自动多一个页签 */
  const domains = sortDomains([...new Set((objects.data?.objects ?? []).map((o) => o.domain))]);
  // 进台账没带域(左轨点进来)时落到首域 —— 页签与内容同一判定
  const effectiveTab = zone === 'ledgers' && tab === '' ? (domains[0] ?? '') : tab;

  /* 面包屑:台面 › 区 › 页签 › 下钻各级 */
  const crumbs: Array<{ label: string; go?: () => void }> = [
    { label: SURFACE_META[surface].brand, go: () => goZone(zone) },
  ];
  crumbs.push({ label: meta.title, go: () => go({ zone, tab, stack: [] }) });
  // 台账区的页签名就是域键 —— 静态表里查不到,呈现走人读短名
  crumbs.push({
    label: TABS[zone].find((t) => t.key === tab)?.label ?? (zone === 'ledgers' ? domainShort(effectiveTab) : tab),
    go: () => go({ zone, tab, stack: [] }),
  });
  stack.forEach((r, i) =>
    crumbs.push({
      label: routeLabel(r),
      ...(i === stack.length - 1 ? {} : { go: () => go({ zone, tab, stack: stack.slice(0, i + 1) }) }),
    }),
  );

  return (
    <div className="g-shell gov-root">
      {/* ===== 深色左轨:本台面的区 ===== */}
      <nav className="g-nav">
        <div className="g-nav-mark">
          <Ico name={surface === 'design' ? 'route' : 'gauge'} s={20} />
        </div>
        <div className="g-nav-brand">{SURFACE_META[surface].brand}</div>
        {ZONES.filter((z) => SURFACE_ZONES[surface].includes(z.key)).map((z) => (
          <button key={z.key} className={'g-nav-b' + (zone === z.key ? ' on' : '')} onClick={() => goZone(z.key)}>
            <span className="g-nav-ico">
              <Ico name={z.icon} s={18} />
            </span>
            <span>{z.label}</span>
          </button>
        ))}
        <div className="g-nav-foot">
          <span className="g-nav-ava">{(me?.name ?? '—').slice(0, 1)}</span>
          <span>{me?.name ?? '未登录'}</span>
        </div>
      </nav>

      <div className="g-body">
        {/* ===== 深色顶栏 ===== */}
        <header className="g-top">
          <span className="g-top-brand">
            JCAI 操作系统<em>单组织 · ≤50 人 · 生产环境</em>
          </span>
          <label className="g-search">
            <Ico name="search" s={14} />
            <input placeholder={SURFACE_META[surface].searchHint} />
            <kbd>⌘K</kbd>
          </label>
          <div className="g-top-r">
            {surface === 'ops' && (
              <button className={'g-tbtn' + (alerts ? ' alert' : '')} onClick={() => jump('tasks', 'todo')}>
                <Ico name="alert-triangle" s={13} />
                告警<b>{alerts}</b>
              </button>
            )}
            {/* 三面互跳:另一面按授权亮灯,工作台人人可回 */}
            {canSeeSurface(session.data, other) && (
              <a className="g-tbtn" href={SURFACE_META[other].path}>
                <Ico name={other === 'design' ? 'route' : 'gauge'} s={13} />
                {SURFACE_META[other].brand}
              </a>
            )}
            <a className="g-tbtn" href="/">
              <Ico name="list-checks" s={13} />
              工作台
            </a>
            <Btn className="g-tbtn" onClick={() => logout.mutate()} busy={logout.isPending}>
              <Ico name="log-out" s={13} />
              登出
            </Btn>
          </div>
        </header>

        {/* ===== 工作面 ===== */}
        <div className="g-page">
          <div className="g-crumb">
            {stack.length > 0 && (
              <button className="g-back" onClick={back} title="返回上一级(Esc)">
                <Ico name="arrow-left" s={15} />
              </button>
            )}
            {crumbs.map((c, i) => (
              <span key={i} className="g-crumb-i">
                {i > 0 && <i className="sep">›</i>}
                {c.go ? <button onClick={c.go}>{c.label}</button> : <b>{c.label}</b>}
              </span>
            ))}
          </div>

          {top === undefined ? (
            <>
              <div className="g-head">
                <span className="g-head-i" style={{ background: meta.accent }}>
                  <Ico name={meta.icon} s={19} />
                </span>
                <div className="g-head-t">
                  <h1>{meta.title}</h1>
                  <p>{meta.desc}</p>
                </div>
              </div>
              {/*
                * 页签栏只在**真有得选**时出现:一区一内容的区(拆分后大多如此)
                * 摆一个只有一颗按钮的导航条,是在给人做无谓的选择。
                * 台账例外 —— 它的页签是随发布生长的数据域,数量本来就不定。
                */}
              <div className={'g-tabs' + (zone !== 'ledgers' && TABS[zone].length <= 1 ? ' hidden' : '')}>
                {zone === 'ledgers'
                  ? // 台账的页签是**数据域**(短名 2-3 字),随发布生长 —— 设计产生运营的形状,落在页签上
                    domains.map((d) => (
                      <button
                        key={d}
                        className={'g-tab' + (effectiveTab === d ? ' on' : '')}
                        title={`数据域 · ${d}`}
                        onClick={() => go({ zone, tab: d, stack: [] })}
                      >
                        <Ico name="table" s={13} />
                        {domainShort(d)}
                      </button>
                    ))
                  : TABS[zone].map((t) => (
                      <button
                        key={t.key}
                        className={'g-tab' + (tab === t.key ? ' on' : '')}
                        onClick={() => go({ zone, tab: t.key, stack: [] })}
                      >
                        <Ico name={t.ico} s={13} />
                        {t.label}
                      </button>
                    ))}
              </div>
              <ZoneHome zone={zone} tab={effectiveTab} nav={nav} />
            </>
          ) : (
            <div className="g-detail" key={`${stack.length}:${top.k}:${top.id}`}>
              <Detail route={top} nav={nav} />
            </div>
          )}
        </div>
      </div>
    </div>
  );
}

function ZoneHome({ zone, tab, nav }: { zone: GovZone; tab: string; nav: Nav }) {
  const P = {
    // 设计中心
    blueprint: BlueprintHome,
    triggers: TriggerRulesHome,
    workflows: WorkflowsHome,
    library: LibraryHome,
    tools: ToolsHome,
    data: DataHome,
    archive: ArchiveHome,
    models: ModelsHome,
    testbed: TestbedHome,
    // 运营中心
    cockpit: CockpitHome,
    runs: RunsHome,
    tasks: TasksHome,
    people: PeopleHome,
    ledgers: LedgersHome,
    system: SystemHome,
  }[zone];
  return <P tab={tab} nav={nav} />;
}

function Detail({ route, nav }: { route: Route; nav: Nav }) {
  switch (route.k) {
    case 'wf':
    case 'apr':
      return <WfPage id={route.id} nav={nav} />;
    case 'task':
      return <TaskPage id={route.id} nav={nav} />;
    case 'tasklog':
      return <TaskLogPage id={route.id} />;
    case 'emp':
      return <EmpPage id={route.id} nav={nav} />;
    case 'role':
      return <RolePage id={route.id} />;
    case 'pkg':
      return <PkgPage id={route.id} nav={nav} />;
    case 'trigger':
      return <TriggerPage id={route.id} />;
    case 'act':
      return <ActPage id={route.id} />;
    case 'tool':
      return <ToolPage id={route.id} />;
    case 'obj':
      return <ObjPage id={route.id} />;
    case 'llm':
      return <LlmPage id={route.id} />;
    case 'chan':
      return <ChanPage id={route.id} />;
  }
}