/**
 * 神之一手设置 section
 *
 * 结构（R-011 迭代 09）：
 *  - 三个子 tab：Tab 设置 / 策略分组 / QMT 连接配置
 *  - Tab 设置：统一管理所有会话 tab（内置 + 策略分组混排），拖动排序（落点立即持久化）+ 显示/隐藏开关；
 *              任何 tab 均不支持重命名/删除（产品约束-009、UI约束-003）
 *  - 策略分组：策略 CRUD（新增/重命名/删除确认）+ 提示「顺序与显示请在 Tab 设置中调整」
 *  - QMT 连接配置：R-004 卡片形式（迭代 03）
 */

import { useState, useEffect, useCallback, Fragment } from 'react';
import { useRpc } from './connection.jsx';
import { ToastProvider, useToast } from './Toast.jsx';
import { StrategyFieldsEditor } from './StrategyFieldsEditor.jsx'; // R-013：策略自定义字段编辑器
import { ExpandChevron } from './ExpandChevron.jsx'; // 展开箭头与策略 tab 表格行图标统一

/** 确认弹窗 */
function ConfirmDialog({ title, message, onConfirm, onCancel }) {
  return (
    <div style={{
      position: 'fixed', inset: 0, background: 'var(--dsw-alias-bg-mask-1, rgba(0,0,0,0.4))',
      display: 'flex', alignItems: 'center', justifyContent: 'center', zIndex: 10000,
    }}>
      <div style={{ background: 'var(--dsw-alias-bg-layer-1, #fff)', padding: 24, borderRadius: 8, maxWidth: 420, width: '90%' }}>
        <h3 style={{ margin: '0 0 12px', fontSize: 16 }}>{title}</h3>
        <div style={{ fontSize: 14, color: 'var(--dsw-alias-label-secondary, #555)', marginBottom: 20 }}>{message}</div>
        <div style={{ display: 'flex', justifyContent: 'flex-end', gap: 10 }}>
          <button onClick={onCancel} style={{ padding: '6px 16px', cursor: 'pointer', border: '1px solid var(--dsw-alias-border-l2, #ccc)', borderRadius: 4, background: 'var(--dsw-alias-bg-layer-1, #fff)' }}>
            取消
          </button>
          <button onClick={onConfirm} style={{ padding: '6px 16px', cursor: 'pointer', border: 'none', borderRadius: 4, background: 'var(--dsw-alias-state-error-primary, #c62828)', color: 'var(--dsw-alias-button-contrast-fill, #fff)' }}>
            确认
          </button>
        </div>
      </div>
    </div>
  );
}

/** switch 组件 */
function Switch({ checked, onChange, disabled }) {
  return (
    <button
      onClick={() => !disabled && onChange(!checked)}
      disabled={disabled}
      style={{
        width: 44, height: 24, borderRadius: 12, border: 'none', cursor: disabled ? 'not-allowed' : 'pointer',
        background: checked ? 'var(--dsw-alias-state-success-primary, #2e7d32)' : 'var(--dsw-alias-border-l4, #9e9e9e)', position: 'relative', padding: 0, transition: 'background 0.2s',
        opacity: disabled ? 0.6 : 1,
      }}
    >
      <span style={{
        position: 'absolute', top: 2, left: checked ? 22 : 2, width: 20, height: 20,
        borderRadius: '50%', background: 'var(--dsw-alias-button-contrast-fill, #fff)', transition: 'left 0.2s',
      }} />
    </button>
  );
}

/** Tab 设置子 tab（R-011：统一管理所有会话 tab —— 内置 + 策略分组混排，拖动排序 + 显隐开关） */
function TabSettings() {
  const [tabs, setTabs] = useState(null);
  const [saving, setSaving] = useState(false);
  const [error, setError] = useState(null);
  const [dragId, setDragId] = useState(null);
  const [overId, setOverId] = useState(null);
  const call = useRpc();
  const toast = useToast();

  const load = useCallback(async () => {
    try {
      const res = await call('one-divine-lot/tabs', {});
      if (res && res.ok && Array.isArray(res.value)) setTabs(res.value);
      else setError((res && res.error && res.error.message) || '加载失败');
    } catch (e) {
      setError(e.message);
    }
  }, [call]);

  useEffect(() => { load(); }, [load]);

  // 整表持久化（拖动落点 / 显隐切换共用；Q1 落点立即持久化）
  const persist = async (nextTabs, msg) => {
    setSaving(true);
    try {
      const res = await call('one-divine-lot/tabs/update', { args: { tabs: nextTabs } });
      if (res && res.ok) {
        setTabs(res.value);
        toast.success(msg + '（刷新页面后生效）');
      } else {
        toast.error((res && res.error && res.error.message) || '保存失败');
        await load();
      }
    } catch (e) {
      toast.error(e.message);
      await load();
    } finally {
      setSaving(false);
    }
  };

  const toggleVisible = async (t) => {
    if (!tabs) return;
    const next = tabs.map((x) => (x.id === t.id ? { ...x, visible: !x.visible } : x));
    await persist(next, '「' + t.name + '」已' + (next.find((x) => x.id === t.id).visible ? '显示' : '隐藏'));
  };

  // 原生 HTML5 拖动：落点重排 + 立即持久化（Q1）
  const handleDrop = async (targetId) => {
    if (!tabs || !dragId || dragId === targetId) { setDragId(null); setOverId(null); return; }
    const from = tabs.findIndex((x) => x.id === dragId);
    const to = tabs.findIndex((x) => x.id === targetId);
    if (from < 0 || to < 0) { setDragId(null); setOverId(null); return; }
    const next = tabs.slice();
    const [moved] = next.splice(from, 1);
    next.splice(to, 0, moved);
    // 重写 order（整表连续）
    const ordered = next.map((x, i) => ({ ...x, order: i }));
    setDragId(null);
    setOverId(null);
    await persist(ordered, '「' + moved.name + '」已移动');
  };

  const badgeStyle = (kind) => ({
    fontSize: 11, borderRadius: 8, padding: '0 6px', marginRight: 6, flex: 'none',
    color: kind === 'builtin' ? 'var(--dsw-alias-state-business-primary, #1565c0)' : 'var(--dsw-alias-state-warn-primary, #6a1b9a)',
    border: kind === 'builtin' ? '1px solid var(--dsw-alias-border-l3, #90caf9)' : '1px solid var(--dsw-alias-border-l3, #ce93d8)',
  });

  return (
    <div>
      <div style={{ fontSize: 12, color: 'var(--dsw-alias-label-secondary, #888)', marginBottom: 12 }}>
        拖动调整所有标签页顺序，开关控制显示/隐藏；内置与策略标签可任意混排。名称不支持在此修改（策略名称在「策略分组」中修改）。
      </div>
      {error && <div style={{ color: 'var(--dsw-alias-state-error-primary, #c62828)', marginBottom: 12 }}>{error}</div>}
      {!tabs && !error && <div style={{ color: 'var(--dsw-alias-label-secondary, #666)' }}>加载中...</div>}
      {tabs && (
        <table style={{ width: '100%', borderCollapse: 'collapse', fontSize: 14 }}>
          <thead>
            <tr style={{ textAlign: 'left', borderBottom: '2px solid var(--dsw-alias-border-l2, #ddd)' }}>
              <th style={{ width: 44, padding: '8px 6px' }}></th>
              <th style={{ padding: '8px 6px' }}>标签页</th>
              <th style={{ width: 80, padding: '8px 6px' }}>显示</th>
            </tr>
          </thead>
          <tbody>
            {tabs.map((t) => (
              <tr
                key={t.id}
                draggable={!saving}
                onDragStart={(e) => { setDragId(t.id); e.dataTransfer.effectAllowed = 'move'; }}
                onDragOver={(e) => { e.preventDefault(); e.dataTransfer.dropEffect = 'move'; setOverId(t.id); }}
                onDragLeave={() => { if (overId === t.id) setOverId(null); }}
                onDrop={(e) => { e.preventDefault(); handleDrop(t.id); }}
                style={{
                  borderBottom: '1px solid var(--dsw-alias-border-l1, #eee)', cursor: saving ? 'default' : 'grab',
                  background: overId === t.id ? 'color-mix(in srgb, var(--dsw-alias-state-business-primary, #1565c0) 12%, transparent)' : 'transparent',
                }}
              >
                <td style={{ padding: '8px 6px', color: 'var(--dsw-alias-label-tertiary, #999)', textAlign: 'center' }}>≡</td>
                <td style={{ padding: '8px 6px' }}>
                  <span style={badgeStyle(t.kind)}>{t.kind === 'builtin' ? '内置' : '策略'}</span>
                  {t.name}
                </td>
                <td style={{ padding: '8px 6px' }}>
                  <Switch checked={t.visible !== false} onChange={() => toggleVisible(t)} disabled={saving} />
                </td>
              </tr>
            ))}
          </tbody>
        </table>
      )}
    </div>
  );
}

/** 策略分组子 tab（原策略 CRUD） */
function StrategyGroupSettings() {
  const [strategies, setStrategies] = useState(null);
  const [error, setError] = useState(null);
  const [saving, setSaving] = useState(false);
  const [newName, setNewName] = useState('');
  const [editingId, setEditingId] = useState(null);
  const [editingName, setEditingName] = useState('');
  const [confirmDelete, setConfirmDelete] = useState(null);
  const [changedMsg, setChangedMsg] = useState(null);
  // R-013：当前展开配置字段的策略 id（null=无展开）
  const [expandedId, setExpandedId] = useState(null);
  const [fieldSaving, setFieldSaving] = useState(false);
  const call = useRpc();
  const toast = useToast();

  const load = useCallback(async () => {
    try {
      const res = await call('one-divine-lot/strategies', {});
      if (res && res.ok) setStrategies(res.value);
      else setError((res && res.error && res.error.message) || '加载失败');
    } catch (e) {
      setError(e.message);
    }
  }, [call]);

  useEffect(() => { load(); }, [load]);

  const handleChanged = useCallback((msg) => {
    setChangedMsg(msg);
    toast.success(msg + '（刷新页面后生效）');
    load();
  }, [load, toast]);

  const handleAdd = async () => {
    const name = newName.trim();
    if (!name) { toast.error('请输入策略名称'); return; }
    setSaving(true);
    try {
      const res = await call('one-divine-lot/strategies/add', { args: { name } });
      if (res && res.ok) {
        setNewName('');
        handleChanged('策略「' + name + '」已添加');
      } else {
        toast.error((res && res.error && res.error.message) || '添加失败');
      }
    } catch (e) {
      toast.error(e.message);
    } finally {
      setSaving(false);
    }
  };

  const handleRename = async (id) => {
    const name = editingName.trim();
    if (!name) { toast.error('名称不能为空'); return; }
    setSaving(true);
    try {
      const res = await call('one-divine-lot/strategies/update', {
        args: { strategies: strategies.map((s) => (s.id === id ? { ...s, name } : s)) },
      });
      if (res && res.ok) {
        setEditingId(null);
        handleChanged('策略已重命名');
      } else {
        toast.error((res && res.error && res.error.message) || '重命名失败');
      }
    } catch (e) {
      toast.error(e.message);
    } finally {
      setSaving(false);
    }
  };

  /** R-013：保存某策略的自定义字段定义（整表 strategies/update） */
  const handleSaveConfig = async (id, configSchema) => {
    setFieldSaving(true);
    try {
      const res = await call('one-divine-lot/strategies/update', {
        args: { strategies: strategies.map((s) => (s.id === id ? { ...s, configSchema } : s)) },
      });
      if (res && res.ok) {
        handleChanged('策略自定义字段已保存');
      } else {
        toast.error((res && res.error && res.error.message) || '保存失败');
      }
    } catch (e) {
      toast.error(e.message);
    } finally {
      setFieldSaving(false);
    }
  };

  const handleDelete = async (id) => {
    setSaving(true);
    try {
      const res = await call('one-divine-lot/strategies/remove', { args: { strategyId: id } });
      if (res && res.ok) {
        setConfirmDelete(null);
        handleChanged('策略已删除，份额已回到未分配');
      } else {
        toast.error((res && res.error && res.error.message) || '删除失败');
        setConfirmDelete(null);
      }
    } catch (e) {
      toast.error(e.message);
      setConfirmDelete(null);
    } finally {
      setSaving(false);
    }
  };

  return (
    <div>
      {changedMsg && (
        <div style={{
          padding: '10px 14px', marginBottom: 12, borderRadius: 6,
          background: 'color-mix(in srgb, var(--dsw-alias-state-business-primary, #1565c0) 10%, var(--dsw-alias-bg-layer-1, #fff))', color: 'var(--dsw-alias-state-business-primary, #1565c0)', fontSize: 13, border: '1px solid var(--dsw-alias-border-l3, #90caf9)',
        }}>
          {changedMsg} —— <strong>刷新页面后生效</strong>
        </div>
      )}

      {error && <div style={{ color: 'var(--dsw-alias-state-error-primary, #c62828)', marginBottom: 12 }}>{error}</div>}

      <div style={{ display: 'flex', gap: 8, marginBottom: 16, alignItems: 'center' }}>
        <input
          type="text"
          placeholder="新策略名称（如：长线持有）"
          value={newName}
          onChange={(e) => setNewName(e.target.value)}
          onKeyDown={(e) => e.key === 'Enter' && handleAdd()}
          style={{ flex: 1, padding: '6px 10px', border: '1px solid var(--dsw-alias-border-l2, #ccc)', borderRadius: 4 }}
        />
        <button
          onClick={handleAdd}
          disabled={saving}
          style={{ padding: '6px 16px', cursor: 'pointer', border: 'none', borderRadius: 4, background: 'var(--dsw-alias-state-success-primary, #2e7d32)', color: 'var(--dsw-alias-button-contrast-fill, #fff)' }}
        >
          + 新增策略
        </button>
      </div>

      <div style={{ fontSize: 12, color: 'var(--dsw-alias-label-secondary, #888)', marginBottom: 12 }}>
        顺序与显示请在「Tab 设置」中调整。
      </div>

      {!strategies && !error && <div style={{ color: 'var(--dsw-alias-label-secondary, #666)' }}>加载中...</div>}
      {strategies && (
        <table style={{ width: '100%', borderCollapse: 'collapse', fontSize: 14 }}>
          <thead>
            <tr style={{ textAlign: 'left', borderBottom: '2px solid var(--dsw-alias-border-l2, #ddd)' }}>
              <th style={{ padding: '8px 6px' }}>策略</th>
              <th style={{ padding: '8px 6px' }}>ID</th>
              <th style={{ padding: '8px 6px' }}>操作</th>
            </tr>
          </thead>
          <tbody>
            {strategies.map((s) => (
              <Fragment key={s.id}>
              <tr style={{ borderBottom: '1px solid var(--dsw-alias-border-l1, #eee)' }}>
                <td style={{ padding: '8px 6px' }}>
                  {editingId === s.id ? (
                    <span>
                      <input
                        type="text"
                        value={editingName}
                        onChange={(e) => setEditingName(e.target.value)}
                        onKeyDown={(e) => e.key === 'Enter' && handleRename(s.id)}
                        style={{ padding: '4px 6px', border: '1px solid #ccc', borderRadius: 3, marginRight: 6 }}
                      />
                      <button onClick={() => handleRename(s.id)} disabled={saving} style={{ padding: '2px 8px', cursor: 'pointer' }}>保存</button>
                      <button onClick={() => setEditingId(null)} style={{ padding: '2px 8px', cursor: 'pointer', marginLeft: 4 }}>取消</button>
                    </span>
                  ) : (
                    <span style={{ display: 'inline-flex', alignItems: 'center', gap: 6 }}>
                      <button
                        onClick={() => { setExpandedId(expandedId === s.id ? null : s.id); }}
                        style={{ padding: '2px 4px', cursor: 'pointer', border: 'none', background: 'none', display: 'inline-flex', alignItems: 'center', justifyContent: 'center', lineHeight: 0 }}
                        title={expandedId === s.id ? '收起配置' : '展开配置自定义字段'}
                      ><ExpandChevron expanded={expandedId === s.id} /></button>
                      {s.name}
                    </span>
                  )}
                </td>
                <td style={{ padding: '8px 6px', color: 'var(--dsw-alias-label-secondary, #666)', fontSize: 12 }}>{s.id}</td>
                <td style={{ padding: '8px 6px', whiteSpace: 'nowrap' }}>
                  <button
                    onClick={() => { setExpandedId(expandedId === s.id ? null : s.id); setEditingId(null); }}
                    style={{ padding: '2px 8px', cursor: 'pointer', border: '1px solid var(--dsw-alias-border-l2, #ccc)', borderRadius: 3, background: 'var(--dsw-alias-bg-layer-1, #fff)', marginRight: 4 }}
                  >{expandedId === s.id ? '收起字段' : '配置字段'}</button>
                  <button
                    onClick={() => { setEditingId(s.id); setEditingName(s.name); }}
                    style={{ padding: '2px 8px', cursor: 'pointer', border: '1px solid var(--dsw-alias-border-l2, #ccc)', borderRadius: 3, background: 'var(--dsw-alias-bg-layer-1, #fff)', marginRight: 4 }}
                  >重命名</button>
                  <button
                    onClick={() => setConfirmDelete({ id: s.id, name: s.name })}
                    style={{ padding: '2px 8px', cursor: 'pointer', border: '1px solid var(--dsw-alias-state-error-primary, #c62828)', borderRadius: 3, background: 'var(--dsw-alias-bg-layer-1, #fff)', color: 'var(--dsw-alias-state-error-primary, #c62828)' }}
                  >删除</button>
                </td>
              </tr>
              {expandedId === s.id && (
                <tr>
                  <td colSpan={3} style={{ padding: '4px 10px 8px', borderBottom: '1px solid var(--dsw-alias-border-l1, #eee)' }}>
                    <StrategyFieldsEditor
                      strategy={s}
                      saving={fieldSaving}
                      onSave={(fields) => handleSaveConfig(s.id, fields)}
                    />
                  </td>
                </tr>
              )}
              </Fragment>
            ))}
          </tbody>
        </table>
      )}

      {confirmDelete && (
        <ConfirmDialog
          title={'删除策略「' + confirmDelete.name + '」'}
          message="该策略下已分配的份额将回到「未分配」，数据不会丢失。确定删除？"
          onConfirm={() => handleDelete(confirmDelete.id)}
          onCancel={() => setConfirmDelete(null)}
        />
      )}
    </div>
  );
}

/** 设置 section 主组件：三个子 tab */
function SettingsSectionInner(props) {
  const [activeTab, setActiveTab] = useState('tabs'); // tabs | strategies | qmt

  return (
    <div style={{ padding: 20, fontFamily: 'system-ui' }}>
      <h2 style={{ margin: '0 0 16px' }}>神之一手</h2>

      {/* 子 tab 导航 */}
      <div style={{ display: 'flex', gap: 4, borderBottom: '1px solid var(--dsw-alias-border-l2, #ddd)', marginBottom: 16 }}>
        {[
          { key: 'tabs', label: 'Tab 设置' },
          { key: 'strategies', label: '策略分组' },
          { key: 'qmt', label: 'QMT 连接配置' },
        ].map((tab) => (
          <button
            key={tab.key}
            onClick={() => setActiveTab(tab.key)}
            style={{
              padding: '8px 16px', cursor: 'pointer', border: 'none', borderBottom: activeTab === tab.key ? '2px solid var(--dsw-alias-state-success-primary, #2e7d32)' : '2px solid transparent',
              background: 'none', fontSize: 14, color: activeTab === tab.key ? 'var(--dsw-alias-state-success-primary, #2e7d32)' : 'var(--dsw-alias-label-secondary, #666)', fontWeight: activeTab === tab.key ? 600 : 400,
            }}
          >
            {tab.label}
          </button>
        ))}
      </div>

      {activeTab === 'tabs' && <TabSettings />}
      {activeTab === 'strategies' && <StrategyGroupSettings />}
      {activeTab === 'qmt' && <QmtConnectionsSettings />}
    </div>
  );
}

/** 导出组件（包 ToastProvider） */
export function SettingsSection(props) {
  return (
    <ToastProvider>
      <SettingsSectionInner {...props} />
    </ToastProvider>
  );
}

/** 长文本省略单元格：单行省略 + 悬停显示完整内容（避免错误信息等长文本撑行换行） */
function EllipsisText({ text, maxWidth = 220, title, style }) {
  return (
    <span title={title || text} style={{
      display: 'inline-block', maxWidth, overflow: 'hidden',
      textOverflow: 'ellipsis', whiteSpace: 'nowrap', verticalAlign: 'bottom',
      ...style,
    }}>{text}</span>
  );
}

/** QMT 连接配置卡片（R-004；产品约束-005、UI约束-002；2026-08-29 老师反馈改卡片形式） */
function QmtConnectionCard({ conn, isActive, isDefault, busy, testResult, onActivate, onSetDefault, onTest, onEdit, onDelete }) {
  const btn = { padding: '3px 10px', cursor: 'pointer', border: '1px solid var(--dsw-alias-border-l2, #ccc)', borderRadius: 4, background: 'var(--dsw-alias-bg-layer-1, #fff)', fontSize: 12 };
  return (
    <div style={{
      border: isActive ? '1px solid var(--dsw-alias-state-success-primary, #2e7d32)' : '1px solid var(--dsw-alias-border-l2, #ddd)',
      background: isActive ? 'color-mix(in srgb, var(--dsw-alias-state-success-primary, #2e7d32) 8%, var(--dsw-alias-bg-layer-1, #fff))' : 'var(--dsw-alias-bg-layer-1, #fff)',
      borderRadius: 8,
      padding: '12px 14px',
      display: 'flex', flexDirection: 'column', gap: 8,
      minWidth: 0, overflow: 'hidden',
      boxShadow: 'var(--dsw-shadow-lv3, 0 1px 2px rgba(0,0,0,0.04))',
    }}>
      {/* 标题行：名称 + 徽标 */}
      <div style={{ display: 'flex', alignItems: 'center', gap: 6, minWidth: 0 }}>
        <EllipsisText text={conn.name} maxWidth={140} style={{ fontWeight: 600, fontSize: 14 }} />
        {isActive && <span style={{ flex: 'none', fontSize: 11, color: 'var(--dsw-alias-state-success-primary, #2e7d32)', border: '1px solid var(--dsw-alias-state-success-primary, #2e7d32)', borderRadius: 8, padding: '0 6px' }}>生效中</span>}
        {isDefault && <span style={{ flex: 'none', fontSize: 11, color: 'var(--dsw-alias-state-business-primary, #1565c0)', border: '1px solid var(--dsw-alias-border-l3, #90caf9)', borderRadius: 8, padding: '0 6px' }}>默认</span>}
      </div>

      {/* 地址行：省略+悬停 */}
      <div style={{ fontSize: 12, color: 'var(--dsw-alias-label-secondary, #666)', minWidth: 0 }}>
        <EllipsisText text={conn.baseUrl} maxWidth={240} />
      </div>

      {/* 测试结果行：可换行但受卡片约束；超长悬停看全文 */}
      {testResult && (
        <div style={{
          fontSize: 12, lineHeight: '16px', color: testResult.ok ? 'var(--dsw-alias-state-success-primary, #2e7d32)' : 'var(--dsw-alias-state-error-primary, #c62828)',
          background: testResult.ok ? 'color-mix(in srgb, var(--dsw-alias-state-success-primary, #2e7d32) 10%, var(--dsw-alias-bg-layer-1, #fff))' : 'color-mix(in srgb, var(--dsw-alias-state-error-primary, #c62828) 10%, var(--dsw-alias-bg-layer-1, #fff))',
          borderRadius: 4, padding: '4px 8px', minWidth: 0,
        }}>
          <EllipsisText text={testResult.text} maxWidth={9999} title={testResult.fullText || testResult.text} />
        </div>
      )}

      {/* 操作行：按钮自动换行排列，不挤压卡片 */}
      <div style={{ display: 'flex', flexWrap: 'wrap', gap: 6, marginTop: 2 }}>
        {!isActive && <button onClick={onActivate} disabled={busy} style={{ ...btn, color: 'var(--dsw-alias-state-success-primary, #2e7d32)', borderColor: 'var(--dsw-alias-state-success-primary, #2e7d32)' }}>激活</button>}
        {!isDefault && <button onClick={onSetDefault} disabled={busy} style={btn}>设为默认</button>}
        <button onClick={onTest} disabled={busy}>{busy ? '测试中…' : '测试连接'}</button>
        <button onClick={onEdit} disabled={busy} style={btn}>编辑</button>
        <button onClick={onDelete} disabled={busy} style={{ ...btn, color: 'var(--dsw-alias-state-error-primary, #c62828)', borderColor: 'var(--dsw-alias-state-error-primary, #c62828)' }}>删除</button>
      </div>
    </div>
  );
}

/** QMT 连接配置子 tab —— 卡片版（R-004；产品约束-005、UI约束-002） */
function QmtConnectionsSettings() {
  const [state, setState] = useState(null); // { list, activeId, defaultId, active }
  const [error, setError] = useState(null);
  const [saving, setSaving] = useState(false);
  const [testingId, setTestingId] = useState(null);
  const [testResult, setTestResult] = useState(null); // { key, ok, text, fullText }
  const [confirmDelete, setConfirmDelete] = useState(null);
  const [formOpen, setFormOpen] = useState(false);
  const [editingId, setEditingId] = useState(null);
  const [formName, setFormName] = useState('');
  const [formUrl, setFormUrl] = useState('');
  const [mcpStatus, setMcpStatus] = useState(null); // R-020/迭代18：MCP 状态
  const [mcpChecking, setMcpChecking] = useState(false);
  const call = useRpc();
  const toast = useToast();

  const load = useCallback(async () => {
    try {
      const res = await call('one-divine-lot/qmt-connections', {});
      if (res && res.ok) setState(res.value);
      else setError((res && res.error && res.error.message) || '加载失败');
    } catch (e) {
      setError(e.message);
    }
  }, [call]);

  const loadMcp = useCallback(async (refresh) => {
    try {
      const res = await call('one-divine-lot/qmt-connections/mcp-status', { args: { refresh: !!refresh } });
      if (res && res.ok) setMcpStatus(res.value);
    } catch { /* 静默 */ }
  }, [call]);

  useEffect(() => { load(); loadMcp(false); }, [load, loadMcp]);

  const openAdd = () => { setEditingId(null); setFormName(''); setFormUrl(''); setFormOpen(true); setTestResult(null); };
  const openEdit = (c) => { setEditingId(c.id); setFormName(c.name); setFormUrl(c.baseUrl); setFormOpen(true); setTestResult(null); };
  const closeForm = () => { setFormOpen(false); setEditingId(null); };

  const validateUrl = (raw) => {
    const url = String(raw || '').trim().replace(/\/+$/, '');
    if (!/^https?:\/\//i.test(url) || url.length <= 8) return null;
    return url;
  };

  const handleSave = async () => {
    const name = formName.trim();
    const url = validateUrl(formUrl);
    if (!name) { toast.error('请输入连接名称'); return; }
    if (!url) { toast.error('HTTP 地址格式无效（需以 http:// 或 https:// 开头）'); return; }
    setSaving(true);
    try {
      const res = editingId === null
        ? await call('one-divine-lot/qmt-connections/add', { args: { name, baseUrl: url } })
        : await call('one-divine-lot/qmt-connections/update', { args: { id: editingId, name, baseUrl: url } });
      if (res && res.ok) {
        closeForm();
        toast.success(editingId === null ? '连接配置已添加' : '连接配置已保存');
        await load();
      } else {
        toast.error((res && res.error && res.error.message) || '保存失败');
      }
    } catch (e) {
      toast.error(e.message);
    } finally {
      setSaving(false);
    }
  };

  const handleActivate = async (c) => {
    if (state && c.id === state.activeId) return;
    setSaving(true);
    try {
      const res = await call('one-divine-lot/qmt-connections/activate', { args: { id: c.id } });
      if (res && res.ok) {
        setState(res.value);
        loadMcp(false); // R-020/迭代18：激活切换后刷新 MCP 状态
        toast.success('已激活：' + c.name + '（立即生效）');
      } else {
        toast.error((res && res.error && res.error.message) || '激活失败');
      }
    } catch (e) {
      toast.error(e.message);
    } finally {
      setSaving(false);
    }
  };

  const handleSetDefault = async (c) => {
    if (state && c.id === state.defaultId) return;
    setSaving(true);
    try {
      const res = await call('one-divine-lot/qmt-connections/set-default', { args: { id: c.id } });
      if (res && res.ok) {
        setState((prev) => prev ? { ...prev, defaultId: c.id } : prev);
        toast.success('已设为默认：' + c.name + '（启动时自动激活）');
      } else {
        toast.error((res && res.error && res.error.message) || '设置默认失败');
      }
    } catch (e) {
      toast.error(e.message);
    } finally {
      setSaving(false);
    }
  };

  const showTest = (key, v) => {
    const text = v.reachable
      ? '可达 · ' + v.latencyMs + 'ms' + (v.status ? ' · status=' + v.status : '')
      : '不可达 · ' + (v.error || ('HTTP ' + v.httpStatus)) + ' · ' + v.latencyMs + 'ms';
    setTestResult({ key, ok: v.reachable === true, text, fullText: text });
  };

  const handleTest = async (c) => {
    setTestingId(c.id);
    try {
      const res = await call('one-divine-lot/qmt-connections/test', { args: { id: c.id } });
      if (res && res.ok) showTest(c.id, res.value);
      else {
        const msg = (res && res.error && res.error.message) || '测试失败';
        setTestResult({ key: c.id, ok: false, text: '不可达 · ' + msg, fullText: msg });
      }
    } catch (e) {
      setTestResult({ key: c.id, ok: false, text: '不可达 · ' + e.message, fullText: e.message });
    } finally {
      setTestingId(null);
    }
  };

  const handleTestForm = async () => {
    const url = validateUrl(formUrl);
    if (!url) { toast.error('HTTP 地址格式无效（需以 http:// 或 https:// 开头）'); return; }
    setTestingId('__form__');
    try {
      const res = await call('one-divine-lot/qmt-connections/test', { args: { baseUrl: url } });
      if (res && res.ok) showTest('__form__', res.value);
      else {
        const msg = (res && res.error && res.error.message) || '测试失败';
        setTestResult({ key: '__form__', ok: false, text: '不可达 · ' + msg, fullText: msg });
      }
    } catch (e) {
      setTestResult({ key: '__form__', ok: false, text: '不可达 · ' + e.message, fullText: e.message });
    } finally {
      setTestingId(null);
    }
  };

  const handleDelete = async (id) => {
    setSaving(true);
    try {
      const res = await call('one-divine-lot/qmt-connections/remove', { args: { id } });
      setConfirmDelete(null);
      if (res && res.ok) {
        setState(res.value);
        const msgs = [];
        if (res.value.removedWasActive) msgs.push('激活已自动切换');
        if (res.value.removedWasDefault) msgs.push('默认标记已转移');
        toast.success('连接配置已删除' + (msgs.length ? '（' + msgs.join('；') + '）' : ''));
      } else {
        toast.error((res && res.error && res.error.message) || '删除失败');
      }
    } catch (e) {
      setConfirmDelete(null);
      toast.error(e.message);
    } finally {
      setSaving(false);
    }
  };

  return (
    <div style={{ minWidth: 0 }}>
      <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', gap: 12, marginBottom: 12 }}>
        <div style={{ fontSize: 13, color: 'var(--dsw-alias-label-secondary, #666)', minWidth: 0 }}>
          激活配置为当前生效连接（切换立即生效）；默认配置在插件启动时自动激活。
        </div>
        <button onClick={openAdd} disabled={saving} style={{ flex: 'none', padding: '6px 16px', cursor: 'pointer', border: 'none', borderRadius: 4, background: 'var(--dsw-alias-state-success-primary, #2e7d32)', color: 'var(--dsw-alias-button-contrast-fill, #fff)' }}>
          + 新增连接
        </button>
      </div>

      {/* R-020/迭代18：MCP 连接状态条（随激活连接；绿=已连接+N工具 / 黄=连接中 / 红=断开 / 灰=未启用） */}
      <div style={{ display: 'flex', alignItems: 'center', gap: 8, marginBottom: 12, minWidth: 0, fontSize: 12 }}>
        <span style={{ flex: 'none', fontWeight: 600 }}>MCP 连接</span>
        <span style={{
          flex: 'none', width: 10, height: 10, borderRadius: '50%',
          background: mcpStatus?.state === 'connected'
            ? 'var(--dsw-alias-state-success-primary, #2e7d32)'
            : mcpStatus?.state === 'connecting'
              ? 'var(--dsw-alias-state-warn-primary, #f9a825)'
              : mcpStatus?.state === 'error'
                ? 'var(--dsw-alias-state-error-primary, #c62828)'
                : 'var(--dsw-alias-label-tertiary, #bbb)',
        }} />
        <EllipsisText
          text={mcpStatus?.state === 'connected'
            ? '已连接' + (mcpStatus.toolCount != null ? '（' + mcpStatus.toolCount + ' 个工具）' : '') + ' · ' + (mcpStatus.url || '')
            : mcpStatus?.state === 'connecting' ? '连接中…'
            : mcpStatus?.state === 'error' ? '断开 · ' + String(mcpStatus.error || '').slice(0, 80)
            : mcpStatus ? '未启用（无激活连接）' : '检测中…'}
          maxWidth={520}
          title={mcpStatus?.error ? String(mcpStatus.error) : (mcpStatus?.url || '')}
        />
        <button
          onClick={async () => {
            if (mcpChecking) return;
            setMcpChecking(true);
            try { await loadMcp(true); } finally { setMcpChecking(false); }
          }}
          disabled={mcpChecking}
          style={{ flex: 'none', padding: '2px 10px', cursor: 'pointer', border: '1px solid var(--dsw-alias-border-l2, #ccc)', borderRadius: 4, background: 'var(--dsw-alias-bg-layer-1, #fff)', fontSize: 12 }}
        >
          {mcpChecking ? '检测中…' : '检测 MCP'}
        </button>
      </div>

      {error && <div style={{ color: 'var(--dsw-alias-state-error-primary, #c62828)', marginBottom: 12 }}><EllipsisText text={error} maxWidth={560} /></div>}
      {!state && !error && <div style={{ color: 'var(--dsw-alias-label-secondary, #666)' }}>加载中...</div>}

      {state && state.list.length === 0 && (
        <div style={{ padding: '24px 0', color: 'var(--dsw-alias-label-secondary, #888)', fontSize: 13 }}>
          暂无连接配置。点击「新增连接」录入第一个 QMT Bridge 地址（如 http://192.168.3.43:8610）。
        </div>
      )}

      {state && state.list.length > 0 && (
        <div style={{
          display: 'grid',
          gridTemplateColumns: 'repeat(auto-fill, minmax(260px, 1fr))',
          gap: 12,
        }}>
          {state.list.map((c) => (
            <QmtConnectionCard
              key={c.id}
              conn={c}
              isActive={c.id === state.activeId}
              isDefault={c.id === state.defaultId}
              busy={saving || testingId === c.id}
              testResult={testResult && testResult.key === c.id ? testResult : null}
              onActivate={() => handleActivate(c)}
              onSetDefault={() => handleSetDefault(c)}
              onTest={() => handleTest(c)}
              onEdit={() => openEdit(c)}
              onDelete={() => setConfirmDelete({ id: c.id, name: c.name })}
            />
          ))}
        </div>
      )}

      {formOpen && (
        <div style={{ marginTop: 16, padding: 16, border: '1px solid var(--dsw-alias-border-l2, #ddd)', borderRadius: 8, background: 'var(--dsw-alias-bg-layer-2, #fafafa)', maxWidth: 640 }}>
          <div style={{ fontSize: 14, fontWeight: 600, marginBottom: 12 }}>{editingId === null ? '新增连接配置' : '编辑连接配置'}</div>
          <div style={{ display: 'flex', flexDirection: 'column', gap: 8, marginBottom: 10 }}>
            <label style={{ display: 'flex', flexDirection: 'column', gap: 4, fontSize: 12, color: 'var(--dsw-alias-label-secondary, #666)' }}>
              连接名称
              <input type="text" placeholder="如：本机 QMT" value={formName}
                onChange={(e) => setFormName(e.target.value)}
                style={{ padding: '6px 10px', border: '1px solid var(--dsw-alias-border-l2, #ccc)', borderRadius: 4, fontSize: 13 }} />
            </label>
            <label style={{ display: 'flex', flexDirection: 'column', gap: 4, fontSize: 12, color: 'var(--dsw-alias-label-secondary, #666)' }}>
              HTTP 地址
              <input type="text" placeholder="如 http://192.168.3.43:8610" value={formUrl}
                onChange={(e) => setFormUrl(e.target.value)}
                onKeyDown={(e) => e.key === 'Enter' && handleSave()}
                style={{ padding: '6px 10px', border: '1px solid var(--dsw-alias-border-l2, #ccc)', borderRadius: 4, fontSize: 13 }} />
            </label>
          </div>
          <div style={{ display: 'flex', flexWrap: 'wrap', gap: 8, alignItems: 'center' }}>
            <button onClick={handleSave} disabled={saving}
              style={{ padding: '6px 16px', cursor: 'pointer', border: 'none', borderRadius: 4, background: 'var(--dsw-alias-state-success-primary, #2e7d32)', color: 'var(--dsw-alias-button-contrast-fill, #fff)' }}>
              保存
            </button>
            <button onClick={handleTestForm} disabled={testingId !== null}
              style={{ padding: '3px 10px', cursor: 'pointer', border: '1px solid var(--dsw-alias-border-l2, #ccc)', borderRadius: 4, background: 'var(--dsw-alias-bg-layer-1, #fff)', fontSize: 12 }}>
              {testingId === '__form__' ? '测试中…' : '测试连接'}
            </button>
            <button onClick={closeForm} disabled={saving}
              style={{ padding: '3px 10px', cursor: 'pointer', border: '1px solid var(--dsw-alias-border-l2, #ccc)', borderRadius: 4, background: 'var(--dsw-alias-bg-layer-1, #fff)', fontSize: 12 }}>
              取消
            </button>
            {testResult && testResult.key === '__form__' && (
              <span style={{
                fontSize: 12, color: testResult.ok ? 'var(--dsw-alias-state-success-primary, #2e7d32)' : 'var(--dsw-alias-state-error-primary, #c62828)',
                background: testResult.ok ? 'color-mix(in srgb, var(--dsw-alias-state-success-primary, #2e7d32) 10%, var(--dsw-alias-bg-layer-1, #fff))' : 'color-mix(in srgb, var(--dsw-alias-state-error-primary, #c62828) 10%, var(--dsw-alias-bg-layer-1, #fff))', borderRadius: 4, padding: '3px 8px',
                minWidth: 0,
              }}>
                <EllipsisText text={testResult.text} maxWidth={360} title={testResult.fullText || testResult.text} />
              </span>
            )}
          </div>
        </div>
      )}

      {confirmDelete && (
        <ConfirmDialog
          title={'删除连接「' + confirmDelete.name + '」'}
          message={
            (state && state.list.length <= 1)
              ? '这是最后一个连接配置，不能删除。'
              : '删除后：若为激活配置将自动切换到默认配置；若为默认配置，默认标记转移到列表第一条。确定删除？'
          }
          onConfirm={() => handleDelete(confirmDelete.id)}
          onCancel={() => setConfirmDelete(null)}
        />
      )}
    </div>
  );
}