/**
 * feature `gov-system` —— 系统管理:LLM 实例四元绑定、通道实例
 *
 * 自 `~/coding/JCAI_PRD/governance/_components/Governance.tsx` 平移:
 * DOM 结构、类名(`g-*` + 色调 `t-*`)与文案原样保留,mock 常量换成服务端投影(README 平移规则 1/2/4)。
 * 区首页只负责导航,治理动作一律落在下钻详情页的**就地确认带**(影响预览三必答)。
 */
import { useEffect, useState } from 'react';
import { useMutation, useQueryClient } from '@tanstack/react-query';
import type { LlmInstanceView, LlmProvider } from '@contracts';
import { probeLlmDraftRoute, probeLlmInstanceRoute, upsertLlmInstanceRoute } from '@contracts';
import { call } from '@web-shared/typed-fetch.ts';
import { Ico } from '@web-shared/Ico.tsx';
import { Card, Chip, NList, NRow, Note, PageHead, QueryGate, Rows, St } from '@web-shared/gov/primitives.tsx';
import type { Nav } from '@web-shared/gov/gov-route.ts';
import { useGovChannels, useGovLlm, useGovLlmProviders } from '@web-shared/gov/gov-api.ts';

export type HomeProps = { tab: string; nav: Nav };

/**
 * Provider 的人读名 —— **只是标签**:默认端点、结构化出参口径、推理回包这些
 * 由服务端的 provider-profile 说了算(那份是唯一真相,前端不复制一份 URL 表来漂移)。
 */
const PROVIDER_LABEL: Readonly<Record<LlmProvider, string>> = {
  'openai-compatible': 'OpenAI 兼容端点',
  openai: 'OpenAI',
  deepseek: 'DeepSeek',
  anthropic: 'Anthropic',
  qwen: '通义千问',
};

/** 端点只显示主机名 —— 卡上要的是「连的是哪家」,不是整条 URL */
const hostOf = (url: string): string => {
  try {
    return new URL(url).host;
  } catch {
    return url === '' ? '—' : url;
  }
};

/** 表单草稿:apiKey 是**只写字段**,留空 = 保持原值(服务端永不回显密钥) */
type LlmDraft = {
  id?: string;
  name: string;
  provider: LlmProvider;
  baseUrl: string;
  model: string;
  apiKey: string;
  systemUse: boolean;
  enabled: boolean;
};

const draftOf = (i: LlmInstanceView): LlmDraft => ({
  id: i.id,
  name: i.name,
  provider: i.provider,
  baseUrl: i.baseUrl,
  model: i.model,
  apiKey: '',
  systemUse: i.systemUse,
  enabled: i.enabled,
});

const EMPTY_DRAFT: LlmDraft = {
  name: '',
  provider: 'deepseek',
  baseUrl: '',
  model: '',
  apiKey: '',
  systemUse: false,
  enabled: true,
};

/**
 * 接入模型 —— **右侧抽屉**,照模型接入面的通行做法排:
 * ① 先挑供应商(一排可点的牌子,选中即预填它的默认端点)
 * ② 再填连接(端点 + 密钥,密钥旁边就是「测试连接」—— 填完当场知道通不通)
 * ③ 最后是型号与用途。底部一条固定动作栏。
 *
 * 为什么是抽屉不是页内卡:配置是**一次性的岔路**,做完就该回到货架。
 * 从前那版把表单摊在页面上,输入框拉到 1100px 宽、动作钮掉出屏幕 —— 那不是表单,是把字段倒在地上。
 */
function LlmDrawer({
  draft,
  onCancel,
  onSaved,
}: {
  draft: LlmDraft;
  onCancel: () => void;
  onSaved: (saved: LlmInstanceView) => void;
}) {
  const [d, setD] = useState<LlmDraft>(draft);
  const [showKey, setShowKey] = useState(false);
  const [err, setErr] = useState<string | undefined>(undefined);
  const [probed, setProbed] = useState<{ ok: boolean; latencyMs?: number; error?: string } | undefined>(undefined);
  const providers = useGovLlmProviders();
  const isNew = draft.id === undefined;
  // Esc 关抽屉 —— 抽屉盖住整屏,不给一条键盘出路是把人关在里面
  useEffect(() => {
    const onKey = (e: KeyboardEvent) => {
      if (e.key === 'Escape') onCancel();
    };
    window.addEventListener('keydown', onKey);
    return () => window.removeEventListener('keydown', onKey);
  }, [onCancel]);
  const profile = (providers.data?.providers ?? []).find((p) => p.provider === d.provider);
  // openai-compatible 没有默认端点:不自填就连不上,这条闸前端先拦一道(服务端也拦)
  const urlNeeded = (profile?.defaultBaseUrl ?? '') === '' && d.baseUrl.trim() === '';
  const invalid = d.name.trim() === '' || d.model.trim() === '' || urlNeeded;

  /** 换供应商时把端点跟着换成它的默认值 —— 除非用户已经手填过别的 */
  const pickProvider = (next: string, nextDefault: string) => {
    const prevDefault = profile?.defaultBaseUrl ?? '';
    const untouched = d.baseUrl.trim() === '' || d.baseUrl.trim() === prevDefault;
    setD({ ...d, provider: next as LlmProvider, ...(untouched ? { baseUrl: nextDefault } : {}) });
    setProbed(undefined);
  };

  const save = useMutation({
    mutationFn: () =>
      call<LlmInstanceView>(upsertLlmInstanceRoute, {
        body: {
          ...(d.id === undefined ? {} : { id: d.id }),
          name: d.name.trim(),
          provider: d.provider,
          baseUrl: d.baseUrl.trim(),
          model: d.model.trim(),
          ...(d.apiKey === '' ? {} : { apiKey: d.apiKey }),
          systemUse: d.systemUse,
          enabled: d.enabled,
        },
      }),
    onSuccess: onSaved,
    onError: (e: unknown) => setErr((e as { message?: string }).message ?? '存不下'),
  });

  /**
   * 测试连接 —— **只测不存**:拿表单上正填的四元去试,一个字节不落库。
   * 密钥留空就用这条实例已存的那把(改端点、换型号不必重打钥匙)。
   */
  const test = useMutation({
    mutationFn: () =>
      call<{ ok: boolean; latencyMs?: number; error?: string }>(probeLlmDraftRoute, {
        body: {
          ...(d.id === undefined ? {} : { id: d.id }),
          name: d.name.trim(),
          provider: d.provider,
          baseUrl: d.baseUrl.trim(),
          model: d.model.trim(),
          ...(d.apiKey === '' ? {} : { apiKey: d.apiKey }),
        },
      }),
    onSuccess: setProbed,
    onError: (e: unknown) => setProbed({ ok: false, error: (e as { message?: string }).message ?? '测试失败' }),
  });

  return (
    <div className="g-drawer" role="dialog" aria-modal="true" aria-label={isNew ? '接入模型' : `配置 ${draft.name}`}>
      <button className="g-drawer-veil" aria-label="关闭" onClick={onCancel} />
      <div className="g-drawer-p">
        <header>
          <div>
            <b>{isNew ? '接入模型' : `配置 ${draft.name}`}</b>
            <span>活动只声明用途名 —— 换厂商换型号不动活动一行代码</span>
          </div>
          <button className="x" aria-label="关闭" onClick={onCancel}>
            <Ico name="x" s={15} />
          </button>
        </header>

        <div className="g-drawer-b">
          {/*
           * 排布按「决定性」从大到小,且**一屏装得下** —— 上一版把 118px 的供应商牌子摆在最前,
           * 结果「模型」「用途名」这两个定义身份的字段掉到折线以下:点开看不见输入框。
           * 现在:供应商收成一行小签 → 身份两栏并排 → 连接 → 开关。
           */}
          <section>
            <h4>供应商</h4>
            <div className="g-chiprow">
              {(providers.data?.providers ?? []).map((p) => (
                <button
                  key={p.provider}
                  className={'g-chip' + (p.provider === d.provider ? ' on' : '')}
                  title={p.defaultBaseUrl === '' ? '没有默认端点,须自填' : p.defaultBaseUrl}
                  onClick={() => pickProvider(p.provider, p.defaultBaseUrl)}
                >
                  {p.label}
                </button>
              ))}
            </div>
          </section>

          <section>
            <h4>身份</h4>
            <div className="g-fld2">
              <label className="g-fld">
                <span>用途名</span>
                <input className="g-input" value={d.name} placeholder="如:quote-extractor" onChange={(e) => setD({ ...d, name: e.target.value })} />
                <small>活动里声明的就是这个名</small>
              </label>
              <label className="g-fld">
                <span>模型</span>
                <input className="g-input mono" value={d.model} placeholder="如:deepseek-chat" onChange={(e) => setD({ ...d, model: e.target.value })} />
                <small>厂商侧型号名</small>
              </label>
            </div>
          </section>

          <section>
            <h4>连接</h4>
            <label className="g-fld">
              <span>API 端点</span>
              <input
                className="g-input mono"
                value={d.baseUrl}
                placeholder={urlNeeded ? '必填,如 https://your-gateway/v1' : '留空取默认端点'}
                onChange={(e) => setD({ ...d, baseUrl: e.target.value })}
              />
              {urlNeeded && <small className="warn">这家没有默认端点 —— 不填连不上</small>}
            </label>
            <label className="g-fld">
              <span>API Key</span>
              <span className="g-inwrap">
                <input
                  className="g-input mono"
                  type={showKey ? 'text' : 'password'}
                  autoComplete="off"
                  value={d.apiKey}
                  placeholder={isNew ? 'sk-…' : '已绑定 · 留空保持原值'}
                  onChange={(e) => setD({ ...d, apiKey: e.target.value })}
                />
                <button className="eye" aria-label={showKey ? '隐藏' : '显示'} onClick={() => setShowKey(!showKey)}>
                  <Ico name={showKey ? 'eye-off' : 'eye'} s={13} />
                </button>
              </span>
              <small>密文存治理台,永不回显</small>
            </label>
            <div className="g-testrow">
              <button className="g-btn xs" disabled={test.isPending || d.model.trim() === '' || urlNeeded} onClick={() => test.mutate()}>
                <Ico name={test.isPending ? 'hourglass' : 'zap'} s={11} />
                {test.isPending ? '测试中…' : '测试连接'}
              </button>
              {probed !== undefined && (
                <span className={'r' + (probed.ok ? ' ok' : ' bad')}>
                  {probed.ok ? `连通 · ${probed.latencyMs ?? '—'} ms` : (probed.error ?? '不通')}
                </span>
              )}
            </div>
          </section>

          <section className="tight">
            <div className="g-swrow">
              <label>
                <input type="checkbox" checked={d.enabled} onChange={(e) => setD({ ...d, enabled: e.target.checked })} />
                启用
              </label>
              <label>
                <input type="checkbox" checked={d.systemUse} onChange={(e) => setD({ ...d, systemUse: e.target.checked })} />
                系统用途
              </label>
              <small>系统用途:叙述性小结 / 汇报生成 / 蒸馏钩子走它</small>
            </div>
          </section>

          {err !== undefined && <Note tone="warn">{err}</Note>}
        </div>

        <footer>
          <button className="g-btn" onClick={onCancel}>
            取消
          </button>
          <button className="g-btn primary" disabled={save.isPending || invalid} onClick={() => save.mutate()}>
            {save.isPending ? '保存中…' : isNew ? '接入' : '保存'}
          </button>
        </footer>
      </div>
    </div>
  );
}

/**
 * 一张实例卡 —— 自检状态归它自己:通了报延迟,不通**把厂商原话摆在卡里**。
 * 原话不改写:「密钥无效」和「端点不通」是两件完全不同的事,改写成一句「连不上」
 * 就等于把要人去修的那条线索抹了(实测:种子里的密钥是占位串,自检当场就说清了)。
 */
function LlmCard({ i, nav, onEdit }: { i: LlmInstanceView; nav: Nav; onEdit: () => void }) {
  const [out, setOut] = useState<{ ok: boolean; latencyMs?: number; error?: string } | undefined>(undefined);
  const probe = useMutation({
    mutationFn: () => call<{ ok: boolean; latencyMs?: number; error?: string }>(probeLlmInstanceRoute, { params: { id: i.id } }),
    onSuccess: setOut,
    onError: (e: unknown) => setOut({ ok: false, error: (e as { message?: string }).message ?? '自检失败' }),
  });
  return (
    <div className={'g-fcard' + (i.enabled ? '' : ' off')}>
      <button className="hit" aria-label={`打开 ${i.name}`} onClick={() => nav.push({ k: 'llm', id: i.id })} />
      <div className="hd">
        <span className="ico">
          <Ico name="cpu" s={17} />
        </span>
        <div className="ttl">
          <b>{i.name}</b>
          {/* 副标说清「连的是哪家的什么型号」—— 端点主机名进计量块 */}
          <em>
            {PROVIDER_LABEL[i.provider]} · {i.model}
          </em>
        </div>
        <span className={'pill' + (i.enabled ? ' on' : '')}>{i.enabled ? '启用' : '停用'}</span>
        <button
          className="mbtn"
          aria-label="连通自检"
          title="连通自检:真发一次最小调用"
          disabled={probe.isPending}
          onClick={() => probe.mutate()}
        >
          <Ico name={probe.isPending ? 'hourglass' : 'zap'} s={13} />
        </button>
        <button className="mbtn" aria-label="配置" title="配置" onClick={onEdit}>
          <Ico name="pen-line" s={13} />
        </button>
      </div>
      <div className="plate">
        <span className={i.apiKeyBound ? '' : 'bad'}>
          <b>{i.apiKeyBound ? '已绑' : '未绑'}</b>
          <i>密钥</i>
        </span>
        <span>
          <b>{i.systemUse ? '是' : '否'}</b>
          <i>系统用途</i>
        </span>
        <span className="wide">
          <b>{hostOf(i.baseUrl)}</b>
          <i>端点</i>
        </span>
      </div>
      {out !== undefined && (
        <div className={'probe' + (out.ok ? ' ok' : ' bad')}>
          <Ico name={out.ok ? 'circle-check' : 'alert-circle'} s={12} />
          {out.ok ? `连通 · ${out.latencyMs ?? '—'} ms` : (out.error ?? '不通')}
        </div>
      )}
    </div>
  );
}

export function ModelsHome({ nav }: HomeProps) {
  return <SystemHome tab="llm" nav={nav} />;
}

export function SystemHome({ tab, nav }: HomeProps) {
  const channels = useGovChannels();

  if (tab === 'chan') {
    return (
      <>
        <NList>
          {(channels.data?.channels ?? []).map((ch) => (
            <NRow
              key={ch.id}
              tone={ch.enabled ? 'brand' : 'mute'}
              ico="mail"
              title={ch.name}
              sub={ch.address}
              cols={[
                { k: '归属键规则', v: ch.extractCount },
                { k: '载荷映射', v: ch.mappingCount },
                { k: '地址窗口', v: <span className="g-mono">{Math.round(ch.addressWindowMs / 3600_000)}h</span> },
                { k: '默认认领岗位', v: ch.fallbackPosition ?? '—' },
              ]}
              right={
                <St tone={ch.enabled ? 'ok' : 'mute'} ico={ch.enabled ? 'circle-check' : 'power'}>
                  {ch.enabled ? '已启用' : '已停用'}
                </St>
              }
              onClick={() => nav.push({ k: 'chan', id: ch.id })}
            />
          ))}
        </NList>
      </>
    );
  }

  return <LlmShelf nav={nav} />;
}

/**
 * 模型实例货架 —— **能配**:卡上直接改四元绑定、开关与密钥,还能当场自检连通。
 * 从前这一屏只读:进来只看得见「密钥已绑定」,却没有一处能绑 —— 那不叫配置面。
 */
function LlmShelf({ nav }: { nav: Nav }) {
  const llm = useGovLlm();
  const queryClient = useQueryClient();
  const [editing, setEditing] = useState<LlmDraft | null>(null);
  const instances = llm.data?.instances ?? [];

  return (
    <QueryGate query={llm}>
      <>
        {editing !== null && (
          <LlmDrawer
            draft={editing}
            onCancel={() => setEditing(null)}
            onSaved={() => {
              void queryClient.invalidateQueries({ queryKey: ['gov', 'llm'] });
              setEditing(null);
            }}
          />
        )}
        <div className="g-shelf">
          {instances.map((i) => (
            <LlmCard key={i.id} i={i} nav={nav} onEdit={() => setEditing(draftOf(i))} />
          ))}
          <button className="g-fcard ghost" onClick={() => setEditing({ ...EMPTY_DRAFT })}>
            <Ico name="plus" s={18} />
            新建模型实例
          </button>
        </div>
      </>
    </QueryGate>
  );
}

export function LlmPage({ id }: { id: string }) {
  const q = useGovLlm();
  const queryClient = useQueryClient();
  const [editing, setEditing] = useState(false);
  const i = (q.data?.instances ?? []).find((x) => x.id === id);
  if (i === undefined) return <Note>实例不存在。</Note>;
  return (
    <>
      <PageHead
        ico="cpu"
        kicker={`LLM 实例 · ${i.provider}`}
        title={i.name}
        chips={
          <>
            <Chip ico="hash">{i.model}</Chip>
            <Chip tone={i.apiKeyBound ? 'ok' : 'warn'}>{i.apiKeyBound ? '密钥已绑定' : '密钥未绑定'}</Chip>
            {i.systemUse && <Chip tone="brand">系统用途</Chip>}
          </>
        }
        desc="名称间接层:活动只声明自定义模型名,四元绑定在系统侧。换厂商、换端点、换密钥都不动活动一行代码。"
      />
      {editing ? (
        <LlmDrawer
          draft={draftOf(i)}
          onCancel={() => setEditing(false)}
          onSaved={() => {
            void queryClient.invalidateQueries({ queryKey: ['gov', 'llm'] });
            setEditing(false);
          }}
        />
      ) : (
        <Card
          ico="settings"
          title="四元绑定"
          extra={
            <button className="g-btn xs" onClick={() => setEditing(true)}>
              <Ico name="pen-line" s={11} /> 配置
            </button>
          }
        >
          <Rows
            items={[
              { k: 'Provider', v: `${PROVIDER_LABEL[i.provider]} · ${i.provider}` },
              { k: 'Base URL', v: i.baseUrl, mono: true },
              { k: 'Model', v: i.model, mono: true },
              { k: 'API-Key', v: i.apiKeyBound ? '已绑定(密文存储,永不回显)' : '未绑定' },
              { k: '启用', v: i.enabled ? '启用中' : '已停用' },
              { k: '系统用途', v: i.systemUse ? '是 —— 叙述性小结 / 汇报生成 / 蒸馏钩子走它' : '否' },
            ]}
          />
        </Card>
      )}
    </>
  );
}

export function ChanPage({ id }: { id: string }) {
  const q = useGovChannels();
  const ch = (q.data?.channels ?? []).find((x) => x.id === id);
  if (ch === undefined) return <Note>通道不存在。</Note>;
  return (
    <>
      <PageHead
        ico="mail"
        kicker={`通道实例 · ${ch.kind}`}
        title={ch.name}
        chips={
          <>
            <Chip ico="at-sign">{ch.address}</Chip>
            <Chip tone={ch.enabled ? 'ok' : 'mute'}>{ch.enabled ? '已启用' : '已停用'}</Chip>
          </>
        }
        desc="归属解析三级逐级短路:会话线程 → 监听键 → 地址窗口;歧义或失败一律判无主——宁交人,不错投。"
      />
      <Card ico="settings" title="归属与映射">
        <Rows
          items={[
            { k: '归属键规则', v: `${ch.extractCount} 条` },
            { k: '载荷映射', v: `${ch.mappingCount} 条` },
            { k: '地址窗口', v: `${Math.round(ch.addressWindowMs / 3600_000)} 小时`, mono: true },
            { k: '默认认领岗位', v: ch.fallbackPosition ?? '—' },
          ]}
        />
      </Card>
    </>
  );
}