import { useEffect, useState } from "react";
import { Banner, Button, Input, Toast } from "@douyinfe/semi-ui-19";
import { api, formatTime, post } from "../api";
import "./mcp-keys.css";

type Token = {
  id: string;
  name: string;
  scopes: string[];
  created_at: string;
  expires_at: string;
  revoked_at: string | null;
  status: "active" | "expired" | "revoked" | "invalid_binding";
};
type TokenPage = {
  items: Token[];
  total: number;
  has_more: boolean;
  enabled: boolean;
  endpoint: string;
  can_create: boolean;
};
const scopes = [
  ["research:read", "读取研究数据", "查询目录、历史、运行与结果"],
  ["research:refresh", "刷新研究数据", "更新缓存、检查自相关及恢复 WorldQuant 认证"],
  ["backtests:execute", "执行回测", "提交新的回测批次"],
  ["backtests:control", "控制回测", "暂停、继续、停止与恢复采集"],
] as const;
const labels = {
  active: "有效",
  expired: "已过期",
  revoked: "已撤销",
  invalid_binding: "账户绑定失效",
};

export function MCPKeysPage() {
  const [data, setData] = useState<TokenPage | null>(null);
  const [offset, setOffset] = useState(0);
  const [version, setVersion] = useState(0);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState("");
  const [name, setName] = useState("");
  const [days, setDays] = useState("90");
  const [permissions, setPermissions] = useState<string[]>(["research:read"]);
  const [busy, setBusy] = useState(false);
  const [created, setCreated] = useState<(Token & { token: string }) | null>(
    null,
  );
  const [revoking, setRevoking] = useState<string | null>(null);
  useEffect(() => {
    let active = true;
    setLoading(true);
    api<TokenPage>(`/mcp-tokens?offset=${offset}&limit=25`)
      .then((next) => {
        if (active) {
          setData(next);
          setError("");
        }
      })
      .catch((e: Error) => {
        if (active) setError(e.message);
      })
      .finally(() => {
        if (active) setLoading(false);
      });
    return () => {
      active = false;
    };
  }, [offset, version]);
  async function create(event: React.FormEvent) {
    event.preventDefault();
    if (busy) return;
    setBusy(true);
    setError("");
    try {
      const result = await post<Token & { token: string }>("/mcp-tokens", {
        name: name.trim(),
        days: Number(days),
        scopes: permissions,
      });
      setCreated(result);
      setName("");
      setOffset(0);
      setVersion((v) => v + 1);
    } catch (e) {
      setError((e as Error).message);
    } finally {
      setBusy(false);
    }
  }
  async function revoke(id: string) {
    setBusy(true);
    try {
      await post(`/mcp-tokens/${id}/revoke`);
      if (created?.id === id) setCreated(null);
      setRevoking(null);
      setVersion((v) => v + 1);
      Toast.success("MCP Key 已撤销");
    } catch (e) {
      setError((e as Error).message);
    } finally {
      setBusy(false);
    }
  }
  async function copy(value: string) {
    try {
      await navigator.clipboard.writeText(value);
      Toast.success("已复制");
    } catch {
      Toast.error("复制失败，请手动选择并复制");
    }
  }
  return (
    <section className="mcp-keys-page">
      <header>
        <div>
          <h1>MCP Key</h1>
          <p>管理 Codex 等客户端访问研究数据和执行回测的权限。</p>
        </div>
        <Button
          disabled={loading || busy}
          onClick={() => setVersion((v) => v + 1)}
        >
          刷新列表
        </Button>
      </header>
      {error && <Banner type="danger" description={error} />}
      {data && !data.enabled && (
        <Banner
          type="warning"
          description="MCP 服务未启用。可以管理 Key，启用服务后客户端才能连接。"
        />
      )}
      {data && !data.can_create && (
        <Banner
          type="warning"
          description="请先在个人信息页连接并确认 WorldQuant 账户身份，再创建 Key。"
        />
      )}
      {data && (
        <section className="mcp-key-card">
          <h2>连接地址</h2>
          <div className="mcp-key-address">
            <code>{data.endpoint}</code>
            <Button onClick={() => void copy(data.endpoint)}>复制地址</Button>
          </div>
          <p>
            客户端使用 Bearer Token 认证。Key 仅用于 MCP，不提供网页管理或正式
            Alpha 提交权限。
          </p>
        </section>
      )}
      {created ? (
        <section
          className="mcp-key-card mcp-key-secret"
          aria-label="新创建的 MCP Key"
        >
          <h2>Key 已创建</h2>
          <p>
            明文仅在这里显示一次。请保存到客户端凭据配置中；关闭、刷新或离开此页后无法再次查看。
          </p>
          <Input aria-label="新 Key 明文" value={created.token} readOnly />
          <div className="mcp-key-actions">
            <Button onClick={() => void copy(created.token)}>复制 Key</Button>
            <Button onClick={() => setCreated(null)}>已保存，关闭明文</Button>
          </div>
        </section>
      ) : (
        <form className="mcp-key-card" onSubmit={(event) => void create(event)}>
          <h2>创建 MCP Key</h2>
          <div className="mcp-key-fields">
            <label>
              名称
              <Input
                aria-label="Key 名称"
                value={name}
                maxLength={100}
                onChange={setName}
                placeholder="例如 Codex 研究助手"
              />
            </label>
            <label>
              有效期（天）
              <input
                aria-label="有效期（天）"
                type="number"
                min="1"
                max="365"
                step="1"
                required
                value={days}
                onChange={(e) => setDays(e.target.value)}
              />
            </label>
          </div>
          <fieldset>
            <legend>访问权限</legend>
            <div className="mcp-key-permissions">
              {scopes.map(([value, label, description]) => (
                <label key={value}>
                  <input
                    type="checkbox"
                    checked={permissions.includes(value)}
                    disabled={value === "research:read" || busy}
                    onChange={(e) =>
                      setPermissions((old) =>
                        e.target.checked
                          ? [...old, value]
                          : old.filter((item) => item !== value),
                      )
                    }
                  />
                  <span>
                    <strong>{label}</strong>
                    <small>
                      {description}
                      {value === "research:read" ? "（必选）" : ""}
                    </small>
                  </span>
                </label>
              ))}
            </div>
          </fieldset>
          <Button
            htmlType="submit"
            theme="solid"
            loading={busy}
            disabled={
              !data?.can_create ||
              !name.trim() ||
              !Number.isInteger(Number(days)) ||
              Number(days) < 1 ||
              Number(days) > 365
            }
          >
            创建 Key
          </Button>
        </form>
      )}
      <section
        className="mcp-key-card"
        aria-label="Key 列表"
        aria-busy={loading}
      >
        <h2>
          已创建的 Key <span className="mcp-key-count">{data?.total ?? 0}</span>
        </h2>
        <div className="mcp-key-table">
          <table>
            <thead>
              <tr>
                <th>名称</th>
                <th>权限</th>
                <th>状态</th>
                <th>创建时间</th>
                <th>到期时间</th>
                <th>操作</th>
              </tr>
            </thead>
            <tbody>
              {data?.items.map((item) => (
                <tr key={item.id}>
                  <td>
                    <strong>{item.name}</strong>
                    <small>{item.id}</small>
                  </td>
                  <td>
                    {item.scopes.map((scope) => (
                      <small key={scope}>
                        {scopes.find(([value]) => value === scope)?.[1] ??
                          scope}
                      </small>
                    ))}
                  </td>
                  <td>{labels[item.status]}</td>
                  <td>{formatTime(item.created_at)}</td>
                  <td>{formatTime(item.expires_at)}</td>
                  <td>
                    {item.revoked_at ? (
                      "—"
                    ) : revoking === item.id ? (
                      <div>
                        <p>撤销后新请求立即失效，已受理回测继续执行。</p>
                        <Button
                          type="danger"
                          disabled={busy}
                          onClick={() => void revoke(item.id)}
                        >
                          确认撤销
                        </Button>
                        <Button
                          disabled={busy}
                          onClick={() => setRevoking(null)}
                        >
                          取消
                        </Button>
                      </div>
                    ) : (
                      <Button
                        type="danger"
                        disabled={busy}
                        onClick={() => setRevoking(item.id)}
                      >
                        撤销
                      </Button>
                    )}
                  </td>
                </tr>
              ))}
            </tbody>
          </table>
        </div>
        {!loading && !data?.items.length && <p>暂无 MCP Key。</p>}
        <div className="mcp-key-actions">
          <Button
            disabled={offset === 0 || loading || busy}
            onClick={() => setOffset((v) => Math.max(0, v - 25))}
          >
            上一页
          </Button>
          <span>第 {Math.floor(offset / 25) + 1} 页</span>
          <Button
            disabled={!data?.has_more || loading || busy}
            onClick={() => setOffset((v) => v + 25)}
          >
            下一页
          </Button>
        </div>
      </section>
    </section>
  );
}