"use client";

import { useRef, useState } from "react";
import { useRouter } from "next/navigation";
import type { BetaAccessRequestRecord } from "@/db/repository";

type SubmitState = { loading: boolean; message: string; error: boolean };

export function AccessRequestForm({
  pendingRequest,
}: {
  pendingRequest: BetaAccessRequestRecord | null;
}) {
  const router = useRouter();
  const pendingKey = useRef<string | null>(null);
  const [preferredOs, setPreferredOs] = useState("windows");
  const [requestedSlots, setRequestedSlots] = useState(1);
  const [useCase, setUseCase] = useState("");
  const [state, setState] = useState<SubmitState>({ loading: false, message: "", error: false });

  async function post(payload: Record<string, unknown>) {
    pendingKey.current ??= crypto.randomUUID();
    const response = await fetch("/api/beta-access", {
      method: "POST",
      headers: { "content-type": "application/json" },
      body: JSON.stringify({ ...payload, idempotencyKey: pendingKey.current }),
    });
    const body = (await response.json()) as { message?: string };
    if (!response.ok) throw new Error(body.message || "操作失败");
    pendingKey.current = null;
  }

  async function submit(event: React.FormEvent) {
    event.preventDefault();
    setState({ loading: true, message: "", error: false });
    try {
      await post({ action: "request", preferredOs, requestedSlots, useCase });
      setState({ loading: false, message: "申请已提交，处理结果会显示在本页。", error: false });
      router.refresh();
    } catch (error) {
      setState({ loading: false, message: error instanceof Error ? error.message : "提交失败", error: true });
    }
  }

  async function cancel() {
    if (!pendingRequest) return;
    setState({ loading: true, message: "", error: false });
    try {
      await post({ action: "cancel", requestId: pendingRequest.id });
      setState({ loading: false, message: "申请已撤回。", error: false });
      router.refresh();
    } catch (error) {
      setState({ loading: false, message: error instanceof Error ? error.message : "撤回失败", error: true });
    }
  }

  if (pendingRequest) {
    return (
      <div className="cloud-form feedback-form">
        <p>申请正在等待人工处理。测试资格没有承诺顺序，也不会因此建立付费关系。</p>
        <button className="button button-secondary" type="button" onClick={cancel} disabled={state.loading}>
          {state.loading ? "正在撤回…" : "撤回这条申请"}
        </button>
        {state.message && <p className={state.error ? "form-error" : "form-success"} role="status">{state.message}</p>}
      </div>
    );
  }

  return (
    <form className="cloud-form feedback-form" onSubmit={submit}>
      <div className="admin-form-grid">
        <label>
          <span>计划使用的主机</span>
          <select value={preferredOs} onChange={(event) => setPreferredOs(event.target.value)}>
            <option value="windows">Windows</option>
            <option value="linux">Linux</option>
            <option value="both">Windows 和 Linux</option>
          </select>
        </label>
        <label>
          <span>希望接入几台</span>
          <input type="number" min={1} max={3} value={requestedSlots} onChange={(event) => setRequestedSlots(Number(event.target.value))} required />
          <small>首批申请限 1–3 台，实际名额以审核结果为准。</small>
        </label>
      </div>
      <label>
        <span>你准备怎么使用 NekoNest？</span>
        <textarea minLength={20} maxLength={1000} value={useCase} onChange={(event) => setUseCase(event.target.value)} placeholder="例如：我主要在 Windows 主机上使用 Codex，希望从手机查看并继续已有任务。请勿粘贴令牌、密码、项目代码或私密会话内容。" required />
        <small>{useCase.length}/1000 · 只需说明设备和使用场景，不要提交任何密钥或会话正文</small>
      </label>
      <button className="button button-primary" type="submit" disabled={state.loading}>
        {state.loading ? "正在提交…" : "申请免费闭测资格"}
      </button>
      {state.message && <p className={state.error ? "form-error" : "form-success"} role="status">{state.message}</p>}
    </form>
  );
}