Genarrative/src/components/creation-home/ClientDownloadEntry.tsx

import { getPlatformActionButtonClassName } from '@genarrative/shared/components';
import { Download, Monitor } from 'lucide-react';
import { useEffect, useState } from 'react';

import type { ClientDownloadResponse } from '../../../packages/shared/src/contracts/clientDownload';
import { PlatformActionButton } from '../common/PlatformActionButton';
import { PlatformStatusMessage } from '../common/PlatformStatusMessage';
import { PlatformSubpanel } from '../common/PlatformSubpanel';
import { UnifiedModal } from '../common/UnifiedModal';

const DOWNLOAD_ERROR = '暂时无法获取最新版本，请稍后重试';

type DownloadState =
  | { status: 'loading' }
  | { status: 'ready'; release: ClientDownloadResponse }
  | { status: 'error' };

const platformNames = { windows: 'Windows', macos: 'macOS' } as const;

function downloadLabel(download: ClientDownloadResponse['downloads'][number]) {
  if (download.platform === 'windows') return 'Windows 64 位';
  return `macOS（${download.architecture === 'aarch64' ? 'Apple Silicon' : 'Intel'}）`;
}

export function ClientDownloadEntry() {
  const [open, setOpen] = useState(false);
  const [attempt, setAttempt] = useState(0);
  const [state, setState] = useState<DownloadState>({ status: 'loading' });

  useEffect(() => {
    if (!open) return;
    const controller = new AbortController();
    let disposed = false;
    const timeout = window.setTimeout(() => {
      if (disposed) return;
      disposed = true;
      controller.abort();
      setState({ status: 'error' });
    }, 15_000);

    setState({ status: 'loading' });
    void (async () => {
      try {
        const response = await fetch('/api/client-downloads', {
          signal: controller.signal,
          cache: 'no-store',
          credentials: 'omit',
        });
        if (!response.ok) throw new Error(DOWNLOAD_ERROR);
        const release = (await response.json()) as ClientDownloadResponse;
        if (
          !Array.isArray(release.downloads) ||
          !Array.isArray(release.unavailablePlatforms)
        ) {
          throw new Error(DOWNLOAD_ERROR);
        }
        if (!disposed) setState({ status: 'ready', release });
      } catch {
        if (!disposed) setState({ status: 'error' });
      } finally {
        window.clearTimeout(timeout);
      }
    })();

    return () => {
      disposed = true;
      window.clearTimeout(timeout);
      controller.abort();
    };
  }, [open, attempt]);

  return (
    <>
      <PlatformActionButton
        tone="secondary"
        size="sm"
        shape="pill"
        aria-label="下载客户端"
        title="下载客户端"
        className="min-h-11 shrink-0 gap-0 whitespace-nowrap max-sm:h-11 max-sm:w-11 max-sm:px-0 sm:gap-2 sm:px-4"
        onClick={() => {
          setState({ status: 'loading' });
          setOpen(true);
        }}
      >
        <Download className="h-4 w-4 shrink-0" aria-hidden="true" />
        <span className="hidden sm:inline">下载客户端</span>
      </PlatformActionButton>
      <UnifiedModal
        open={open}
        onClose={() => setOpen(false)}
        title="下载陶泥儿客户端"
        size="sm"
      >
        {state.status === 'loading' ? (
          <PlatformStatusMessage tone="info" role="status">
            正在获取最新版本…
          </PlatformStatusMessage>
        ) : state.status === 'error' ? (
          <div className="flex flex-col gap-4">
            <PlatformStatusMessage tone="error" role="alert">
              {DOWNLOAD_ERROR}
            </PlatformStatusMessage>
            <PlatformActionButton
              onClick={() => setAttempt((value) => value + 1)}
            >
              重试
            </PlatformActionButton>
          </div>
        ) : (
          <div className="flex flex-col gap-4">
            {state.release.downloads.map((download) => (
              <PlatformSubpanel
                key={`${download.platform}-${download.architecture}`}
                as="section"
                aria-label={downloadLabel(download)}
                padding="md"
                radius="md"
              >
                <div className="mb-4 flex items-center gap-3">
                  <Monitor
                    className="h-7 w-7 shrink-0 text-[var(--platform-accent-strong)]"
                    aria-hidden="true"
                  />
                  <div>
                    <p className="font-semibold text-[var(--platform-text-strong)]">
                      {downloadLabel(download)}
                    </p>
                    <p className="text-sm text-[var(--platform-text-soft)]">
                      最新版本 v{download.version}
                    </p>
                  </div>
                </div>
                <a
                  href={download.downloadUrl}
                  className={getPlatformActionButtonClassName({
                    size: 'md',
                    fullWidth: true,
                  })}
                  referrerPolicy="no-referrer"
                >
                  <Download className="h-4 w-4 shrink-0" aria-hidden="true" />
                  {download.platform === 'windows'
                    ? '下载 Windows 版'
                    : `下载 ${downloadLabel(download)}`}
                </a>
              </PlatformSubpanel>
            ))}
            {state.release.downloads.length === 0 ? (
              <PlatformStatusMessage tone="info" role="status">
                暂无可下载版本
              </PlatformStatusMessage>
            ) : null}
            {state.release.unavailablePlatforms.length > 0 ? (
              <PlatformStatusMessage tone="warning" role="alert">
                {state.release.unavailablePlatforms
                  .map((platform) => platformNames[platform])
                  .join('、')}{' '}
                版本暂时无法获取
              </PlatformStatusMessage>
            ) : null}
            {state.release.downloads.length === 0 ||
            state.release.unavailablePlatforms.length > 0 ? (
              <PlatformActionButton
                tone="secondary"
                onClick={() => setAttempt((value) => value + 1)}
              >
                重试
              </PlatformActionButton>
            ) : null}
          </div>
        )}
      </UnifiedModal>
    </>
  );
}