import { useCallback, useEffect, useMemo, useState } from 'react';
import {
  clearUserCapabilityOverrides,
  clearUserSkillOverrides,
  getRoleCapabilities,
  getRoleSkills,
  getUserCapabilities,
  getUserSkills,
  listCapabilityCatalog,
  listSkillCatalog,
  updateRoleCapabilities,
  updateRoleSkills,
  updateUserCapabilities,
  updateUserSkills,
} from '../api/client';
import type { AdminUserRow, SkillDefinition, SkillMap } from '../types';

const WEB_CAPABILITY_KEY = 'web';
const WEB_SKILL_NAME = 'web';

function SkillGrid({
  catalog,
  values,
  disabled,
  onChange,
}: {
  catalog: SkillDefinition[];
  values: SkillMap;
  disabled?: boolean;
  onChange: (name: string, enabled: boolean) => void;
}) {
  return (
    <div className="capability-grid">
      <div className="capability-group">
        <h3>平台技能</h3>
        <ul>
          {catalog.map((item) => (
            <li key={item.name}>
              <label>
                <input
                  type="checkbox"
                  checked={Boolean(values[item.name])}
                  disabled={disabled}
                  onChange={(e) => onChange(item.name, e.target.checked)}
                />
                <span className="capability-label">
                  {item.label}
                  <code className="skill-name-tag">{item.name}</code>
                  {item.requiresPublish && (
                    <span className="risk-pill risk-medium">含页面发布</span>
                  )}
                </span>
                <span className="muted capability-desc">{item.description}</span>
              </label>
            </li>
          ))}
        </ul>
      </div>
    </div>
  );
}

function WebSearchToolPanel({
  roleEnabled,
  userEnabled,
  showUser,
  disabled,
  onRoleChange,
  onUserChange,
}: {
  roleEnabled: boolean;
  userEnabled: boolean;
  showUser: boolean;
  disabled?: boolean;
  onRoleChange: (enabled: boolean) => void;
  onUserChange: (enabled: boolean) => void;
}) {
  return (
    <div className="capability-grid" style={{ marginBottom: '1.25rem' }}>
      <div className="capability-group">
        <div className="capability-group-header">
          <h3>联网搜索工具</h3>
          <span className="capability-group-count">platform/web</span>
        </div>
        <ul>
          <li className="capability-item">
            <div className="capability-item-info">
              <span className="capability-label">
                网页搜索
                <code className="skill-name-tag">{WEB_CAPABILITY_KEY}</code>
                <span className="risk-pill risk-medium">风险 中</span>
              </span>
              <span className="muted capability-desc">
                在 Agent session 挂载 <code>platform/web</code> 扩展，提供{' '}
                <code>web_search</code> / <code>fetch_url</code>。需同时开启下方{' '}
                <code>{WEB_SKILL_NAME}</code> 技能；用户策略 <code>network_egress=deny</code>{' '}
                时会自动禁用。
              </span>
            </div>
            {!showUser ? (
              <label className="capability-toggle" aria-label="启用网页搜索">
                <input
                  type="checkbox"
                  checked={roleEnabled}
                  disabled={disabled}
                  onChange={(e) => onRoleChange(e.target.checked)}
                />
                <span className="toggle-track">
                  <span className="toggle-thumb" />
                </span>
              </label>
            ) : (
              <label className="capability-toggle" aria-label="启用网页搜索">
                <input
                  type="checkbox"
                  checked={userEnabled}
                  disabled={disabled}
                  onChange={(e) => onUserChange(e.target.checked)}
                />
                <span className="toggle-track">
                  <span className="toggle-thumb" />
                </span>
              </label>
            )}
          </li>
        </ul>
      </div>
    </div>
  );
}

export function SkillSettings({
  users,
  userId,
  userOnly = false,
}: {
  users: AdminUserRow[];
  userId?: string;
  userOnly?: boolean;
}) {
  const [catalog, setCatalog] = useState<SkillDefinition[]>([]);
  const [roleSkills, setRoleSkills] = useState<SkillMap>({});
  const [roleWebEnabled, setRoleWebEnabled] = useState(false);
  const [hasWebCapabilityCatalog, setHasWebCapabilityCatalog] = useState(false);
  const [selectedUserId, setSelectedUserId] = useState(userId ?? '');
  const [userSkills, setUserSkills] = useState<SkillMap>({});
  const [userWebEnabled, setUserWebEnabled] = useState(false);
  const [userWebOverride, setUserWebOverride] = useState<boolean | null>(null);
  const [userOverrides, setUserOverrides] = useState<SkillMap>({});
  const [loading, setLoading] = useState(true);
  const [message, setMessage] = useState<string | null>(null);
  const [error, setError] = useState<string | null>(null);

  const load = useCallback(async () => {
    setLoading(true);
    setError(null);
    try {
      const [catalogItems, roleState, capabilityCatalog, roleCapabilities] = await Promise.all([
        listSkillCatalog(),
        getRoleSkills('user'),
        listCapabilityCatalog(),
        getRoleCapabilities('user'),
      ]);
      setCatalog(catalogItems);
      setRoleSkills(roleState.skills);
      setHasWebCapabilityCatalog(capabilityCatalog.some((item) => item.key === WEB_CAPABILITY_KEY));
      setRoleWebEnabled(Boolean(roleCapabilities.capabilities[WEB_CAPABILITY_KEY]));
    } catch (err) {
      setError(err instanceof Error ? err.message : '加载技能目录失败');
    } finally {
      setLoading(false);
    }
  }, []);

  const loadUserSkills = useCallback(async (userId: string) => {
    if (!userId) {
      setUserSkills({});
      setUserWebEnabled(false);
      setUserWebOverride(null);
      setUserOverrides({});
      return;
    }
    try {
      const [state, capabilityState] = await Promise.all([
        getUserSkills(userId),
        getUserCapabilities(userId),
      ]);
      setUserSkills(state.skills);
      setUserOverrides(state.overrides);
      setUserWebEnabled(Boolean(capabilityState.capabilities[WEB_CAPABILITY_KEY]));
      setUserWebOverride(
        Object.prototype.hasOwnProperty.call(capabilityState.overrides, WEB_CAPABILITY_KEY)
          ? Boolean(capabilityState.overrides[WEB_CAPABILITY_KEY])
          : null,
      );
    } catch (err) {
      setError(err instanceof Error ? err.message : '加载用户技能失败');
    }
  }, []);

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

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

  useEffect(() => {
    if (userId) {
      setSelectedUserId(userId);
    }
  }, [userId]);

  const saveRoleDefaults = async () => {
    setMessage(null);
    setError(null);
    try {
      const [skillsResult] = await Promise.all([
        updateRoleSkills('user', roleSkills),
        hasWebCapabilityCatalog
          ? updateRoleCapabilities('user', { [WEB_CAPABILITY_KEY]: roleWebEnabled })
          : Promise.resolve(null),
      ]);
      setRoleSkills(skillsResult.skills);
      setMessage('普通用户默认技能与联网工具已保存，并已同步到各用户工作区');
    } catch (err) {
      setError(err instanceof Error ? err.message : '保存失败');
    }
  };

  const saveUserOverrides = async () => {
    if (!selectedUserId) return;
    setMessage(null);
    setError(null);
    try {
      const [skillsResult] = await Promise.all([
        updateUserSkills(selectedUserId, userSkills),
        hasWebCapabilityCatalog
          ? updateUserCapabilities(selectedUserId, { [WEB_CAPABILITY_KEY]: userWebEnabled })
          : Promise.resolve(null),
      ]);
      setUserSkills(skillsResult.skills);
      await loadUserSkills(selectedUserId);
      setMessage('用户技能与联网工具已保存，并已安装到其 MindSpace 发布目录');
    } catch (err) {
      setError(err instanceof Error ? err.message : '保存失败');
    }
  };

  const resetUserOverrides = async () => {
    if (!selectedUserId) return;
    setMessage(null);
    setError(null);
    try {
      await Promise.all([
        clearUserSkillOverrides(selectedUserId),
        hasWebCapabilityCatalog ? clearUserCapabilityOverrides(selectedUserId) : Promise.resolve(),
      ]);
      await loadUserSkills(selectedUserId);
      setMessage('已恢复为角色默认技能与联网工具');
    } catch (err) {
      setError(err instanceof Error ? err.message : '重置失败');
    }
  };

  const regularUsers = users.filter((user) => user.role === 'user');
  const webSkillEnabledForRole = Boolean(roleSkills[WEB_SKILL_NAME]);
  const webSkillEnabledForUser = Boolean(userSkills[WEB_SKILL_NAME]);
  const webMismatchRole = useMemo(
    () => hasWebCapabilityCatalog && webSkillEnabledForRole && !roleWebEnabled,
    [hasWebCapabilityCatalog, webSkillEnabledForRole, roleWebEnabled],
  );
  const webMismatchUser = useMemo(
    () => hasWebCapabilityCatalog && webSkillEnabledForUser && !userWebEnabled,
    [hasWebCapabilityCatalog, webSkillEnabledForUser, userWebEnabled],
  );

  return (
    <section className="admin-card">
      <div className="admin-card-head">
        <h2>技能配置</h2>
        <button type="button" className="ghost-btn" onClick={() => void load()}>
          刷新
        </button>
      </div>
      <p className="muted capability-intro">
        勾选后技能会安装到用户 <code>MindSpace/用户名/.agents/skills/</code>，对话中可通过 load_skill
        使用。开通「静态页面发布」技能会自动启用页面写入能力。联网搜索需在下方同时开启{' '}
        <strong>网页搜索工具</strong> 与 <code>web</code> 技能。
      </p>
      {error && <p className="banner banner-error">{error}</p>}
      {message && <p className="banner banner-info">{message}</p>}
      {loading ? (
        <p className="muted">加载中…</p>
      ) : !hasWebCapabilityCatalog ? (
        <p className="banner banner-error">
          当前 Portal 能力目录缺少 <code>web</code>，请更新 Memind 后端并重启 admin-api。
        </p>
      ) : catalog.length === 0 ? (
        <p className="muted">暂无平台技能，请在 Memind/skills/ 下添加 SKILL.md</p>
      ) : (
        <>
          {!userOnly && (
            <>
              <h3 className="capability-section-title">普通用户默认</h3>
              <WebSearchToolPanel
                roleEnabled={roleWebEnabled}
                userEnabled={userWebEnabled}
                showUser={false}
                onRoleChange={setRoleWebEnabled}
                onUserChange={setUserWebEnabled}
              />
              {webMismatchRole ? (
                <p className="banner banner-error">
                  已开启 <code>web</code> 技能但未启用网页搜索工具，Agent 将无法使用 web_search。
                </p>
              ) : null}
              <h3 className="capability-section-title">普通用户默认技能</h3>
              <SkillGrid
                catalog={catalog}
                values={roleSkills}
                onChange={(name, enabled) => setRoleSkills((prev) => ({ ...prev, [name]: enabled }))}
              />
              <div className="capability-actions">
                <button type="button" className="send-btn" onClick={() => void saveRoleDefaults()}>
                  保存默认配置
                </button>
              </div>
            </>
          )}

          {!userOnly && <h3 className="capability-section-title">单用户覆盖</h3>}
          {!userOnly && (
            <div className="admin-form capability-user-picker">
              <select value={selectedUserId} onChange={(e) => setSelectedUserId(e.target.value)}>
                <option value="">选择用户（可选）</option>
                {regularUsers.map((user) => (
                  <option key={user.id} value={user.id}>
                    {user.displayName} (@{user.username})
                  </option>
                ))}
              </select>
            </div>
          )}
          {selectedUserId && (
            <>
              {userWebOverride != null && (
                <p className="muted">联网工具已单独覆盖为 {userWebOverride ? '开启' : '关闭'}。</p>
              )}
              <WebSearchToolPanel
                roleEnabled={roleWebEnabled}
                userEnabled={userWebEnabled}
                showUser
                onRoleChange={setRoleWebEnabled}
                onUserChange={setUserWebEnabled}
              />
              {webMismatchUser ? (
                <p className="banner banner-error">
                  该用户已开启 <code>web</code> 技能但未启用网页搜索工具。
                </p>
              ) : null}
              {Object.keys(userOverrides).length > 0 && (
                <p className="muted">
                  已设置 {Object.keys(userOverrides).length} 项技能单独覆盖。
                </p>
              )}
              <h3 className="capability-section-title">用户技能</h3>
              <SkillGrid
                catalog={catalog}
                values={userSkills}
                onChange={(name, enabled) =>
                  setUserSkills((prev) => ({ ...prev, [name]: enabled }))
                }
              />
              <div className="capability-actions">
                <button type="button" className="send-btn" onClick={() => void saveUserOverrides()}>
                  保存用户配置
                </button>
                <button type="button" className="ghost-btn" onClick={() => void resetUserOverrides()}>
                  恢复角色默认
                </button>
              </div>
            </>
          )}
        </>
      )}
    </section>
  );
}