/**
 * 审批要素 —— 自 `~/coding/JCAI_PRD/workbench/_components/ModuleWorkspace.tsx`
 * 的 `ApprovalsModule` / `ApprovalDetail` 平移;mock 数据换成服务端投影。
 *
 * 「工作台层面的『审批』**专指工作流级的审批点**」:它卡到审批人工位,产出审批单——
 * 通过 / 驳回,附依据。**没有预算、没有 Harness、没有任务日志,所以不是任务。**
 */
import { useState } from 'react';
import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
import type { ApprovalItem, ListApprovalsForMeOutput } from '@contracts';
import { decideApprovalRoute, listApprovalsForMeRoute } from '@contracts';
import { Ico } from '@web-shared/Ico.tsx';
import ScrollArea from '@web-shared/ScrollArea.tsx';
import { call } from '@web-shared/typed-fetch.ts';
import { Chip, DocPanel, Hero, EmptyState, ListEmpty, NoteBand, Section, SidebarHead } from '@web-shared/desk/module-kit.tsx';

const STATE_CHIP = {
  pending: { tone: 'todo' as const, label: '待审批', pulse: true },
  passed: { tone: 'ok' as const, label: '已通过', pulse: false },
  rejected: { tone: 'warn' as const, label: '已退回', pulse: false },
};

export function ApprovalDesk() {
  const queryClient = useQueryClient();
  const [selId, setSelId] = useState<string | undefined>(undefined);
  const [filter, setFilter] = useState<'todo' | 'done'>('todo');
  const [comment, setComment] = useState('');
  const [error, setError] = useState<string | undefined>(undefined);

  const q = useQuery({
    queryKey: ['approvals'],
    queryFn: () => call<ListApprovalsForMeOutput>(listApprovalsForMeRoute),
  });
  const approvals = q.data?.approvals ?? [];
  const todo = approvals.filter((a) => a.state === 'pending');
  const done = approvals.filter((a) => a.state !== 'pending');
  const visible = filter === 'todo' ? todo : done;
  const sel = approvals.find((a) => a.id === selId) ?? visible[0];

  const decide = useMutation({
    mutationFn: (input: { item: ApprovalItem; verdict: 'pass' | 'reject' }) =>
      call(decideApprovalRoute, {
        params: { workflowId: input.item.workflowId, nodeId: input.item.nodeId },
        body: { verdict: input.verdict, ...(comment.trim() === '' ? {} : { comment: comment.trim() }) },
      }),
    onSuccess: () => {
      setComment('');
      setError(undefined);
      void queryClient.invalidateQueries({ queryKey: ['approvals'] });
      void queryClient.invalidateQueries({ queryKey: ['tasks'] });
    },
    onError: (e: unknown) => setError((e as { message?: string }).message ?? '裁决失败'),
  });

  return (
    <div className="workspace">
      <aside className="task-sidebar">
        <SidebarHead icon="file-check" title="审批中心" sub={`等我放行的事项 · ${todo.length} 件待批`} />
        <div className="jc-flt-wrap" aria-label="审批筛选">
          <div className="jc-flt" role="tablist" aria-label="按状态">
            <button className={filter === 'todo' ? 'active' : ''} onClick={() => setFilter('todo')}>
              <span>待我审批</span>
              <strong>{todo.length}</strong>
            </button>
            <button className={filter === 'done' ? 'active' : ''} onClick={() => setFilter('done')}>
              <span>已处理</span>
              <strong>{done.length}</strong>
            </button>
          </div>
        </div>
        <ScrollArea className="jc-sa--fill" vpClassName="task-list">
          {visible.map((a) => {
            const chip = STATE_CHIP[a.state];
            return (
              <button
                key={a.id}
                className={'jc-mcard jc-acard' + (a.id === sel?.id ? ' selected' : '')}
                onClick={() => setSelId(a.id)}
              >
                <span className="jc-mcard-ico" style={{ background: 'linear-gradient(140deg, #3370ff, #245bdb)' }}>
                  <Ico name="shield-check" s={15} />
                </span>
                <span className="jc-mcard-body">
                  <span className="jc-mcard-top">
                    <em>审批点签批</em>
                    <Chip tone={chip.tone} label={chip.label} pulse={chip.pulse} />
                  </span>
                  <strong className="jc-mcard-title jc-clamp2">{a.title}</strong>
                  <span className="jc-acard-from">
                    <Ico name="workflow" s={12} />
                    <b>{a.workflowSubject}</b>
                    <time className="jc-mono">{a.raisedAt.slice(5, 16).replace('T', ' ')}</time>
                  </span>
                </span>
              </button>
            );
          })}
          {visible.length === 0 && (
            <ListEmpty icon="circle-check" title={filter === 'todo' ? '待批清空了' : '还没有处理记录'}>
              {filter === 'todo'
                ? '没有等你放行的事项 —— 有新的审批单会第一时间到这里。'
                : '你处理过的审批会留在这里,随时回看当时的依据与裁决。'}
            </ListEmpty>
          )}
        </ScrollArea>
      </aside>

      {sel === undefined ? (
        <main className="execution-panel jc-panel-card">
          <EmptyState
            ico="shield-check"
            tone="ok"
            title="没有等你放行的事项"
            desc="流程走到审批点时,审批单会连同它的依据一起送到这里 —— 你只需要看一眼就能拍板。"
          />
        </main>
      ) : (
        <DocPanel scrollKey={sel.id}>
          <Hero
            grad={['#3370ff', '#245bdb']}
            icon="shield-check"
            kicker={`审批点 · ${sel.nodeId}`}
            title={sel.title}
            meta={
              <>
                <Ico name="workflow" s={14} />
                <b>{sel.workflowSubject}</b>
                <span className="jc-dim">工作流 {sel.workflowId.slice(0, 8)}</span>
              </>
            }
            chip={<Chip tone={STATE_CHIP[sel.state].tone} label={STATE_CHIP[sel.state].label} />}
          />

          <Section icon="clipboard-check" title="依据快照" extra="调用必附上下文 · 裸调用不得发出">
            <div className="jc-kv">
              {sel.basis.map((b) => (
                <div key={b.k} className="jc-kv-i">
                  <i>{b.k}</i>
                  <b className="jc-mono">{b.v}</b>
                </div>
              ))}
              {sel.basis.length === 0 && <span className="jc-dim">上游尚无输出口载荷</span>}
            </div>
          </Section>

          <Section icon="git-branch" title="驳回走向" extra="声明式 · 不由临场决定">
            <NoteBand>{sel.rejectRoute}</NoteBand>
          </Section>

          {sel.state === 'pending' ? (
            <Section icon="pen-line" title="签批意见" extra="驳回必附意见">
              <textarea
                className="jc-sup"
                rows={3}
                placeholder="写下裁决依据(驳回时必填)"
                value={comment}
                onChange={(e) => setComment(e.target.value)}
              />
              {error !== undefined && <div className="jc-callout t-bad">{error}</div>}
              <div className="jc-mod-actions">
                <button
                  type="button"
                  className="card-btn"
                  disabled={decide.isPending}
                  onClick={() => decide.mutate({ item: sel, verdict: 'reject' })}
                >
                  <Ico name="rotate-ccw" s={13} />
                  驳回
                </button>
                <button
                  type="button"
                  className="card-btn primary"
                  disabled={decide.isPending}
                  onClick={() => decide.mutate({ item: sel, verdict: 'pass' })}
                >
                  <Ico name="check" s={13} />
                  通过
                </button>
              </div>
            </Section>
          ) : (
            <div className="jc-mod-actions">
              <span className="jc-mod-donehint">
                <Ico name="circle-check" s={15} />
                已裁决 · 流程按声明继续
              </span>
            </div>
          )}
        </DocPanel>
      )}
    </div>
  );
}