import type { ImageHistoryItem, PublicUser } from "@/lib/types";

interface HistoryGalleryProps {
  currentUser: PublicUser;
  items: ImageHistoryItem[];
}

const dateTimeFormatter = new Intl.DateTimeFormat("zh-CN", {
  year: "numeric",
  month: "2-digit",
  day: "2-digit",
  hour: "2-digit",
  minute: "2-digit",
});

export default function HistoryGallery({
  currentUser,
  items,
}: HistoryGalleryProps) {
  const totalUsers = new Set(items.map((item) => item.userId)).size;
  const latestItem = items[0] ?? null;

  return (
    <div className="history-grid">
      <div className="history-overview-grid">
        <section className="card history-overview-card">
          <div className="section-heading">
            <div>
              <p className="section-kicker">Archive</p>
              <h3>
                {currentUser.role === "admin" ? "全站生成历史" : "我的生成历史"}
              </h3>
            </div>
            <span className="subtle-pill">{items.length} 张图片</span>
          </div>

          <div className="history-stat-grid">
            <article className="history-stat-card">
              <span>图片总数</span>
              <strong>{items.length}</strong>
            </article>
            <article className="history-stat-card">
              <span>{currentUser.role === "admin" ? "涉及用户" : "当前身份"}</span>
              <strong>
                {currentUser.role === "admin" ? `${totalUsers} 位` : "普通用户"}
              </strong>
            </article>
            <article className="history-stat-card">
              <span>最近一张</span>
              <strong>
                {latestItem
                  ? dateTimeFormatter.format(new Date(latestItem.createdAt))
                  : "暂无记录"}
              </strong>
            </article>
          </div>
        </section>

        <section className="card history-overview-card history-overview-card-muted">
          <div className="section-heading">
            <div>
              <p className="section-kicker">Access</p>
              <h3>权限与查看范围</h3>
            </div>
          </div>

          <p className="muted block-copy">
            {currentUser.role === "admin"
              ? "管理员可以查看所有用户的历史记录、原始提示词和生成参数，页面会额外标注每张图所属的账号。"
              : "普通用户只能查看自己的历史记录和图片内容，接口会按当前登录账号做隔离。"}
          </p>

          <div className="meta-pills history-info-pills">
            <span>Prompt 可回看</span>
            <span>按账号隔离</span>
            <span>原图可下载</span>
          </div>
        </section>
      </div>

      {items.length === 0 ? (
        <section className="card history-empty-card">
          <div className="placeholder-orb" />
          <h4>还没有历史图片</h4>
          <p>
            生成成功后的图片会自动保存到服务器，这里会展示图片、提示词和模型参数。
          </p>
        </section>
      ) : (
        <section className="history-gallery-list">
          {items.map((item) => (
            <article key={item.id} className="card history-card">
              <div className="history-card-media">
                <img src={item.imageUrl} alt={item.fileName} loading="lazy" />
              </div>

              <div className="history-card-header">
                <div>
                  <h4>{item.fileName}</h4>
                  <p className="muted">
                    {dateTimeFormatter.format(new Date(item.createdAt))}
                  </p>
                </div>
                {currentUser.role === "admin" ? (
                  <span className="subtle-pill history-owner-pill">
                    {item.username}
                  </span>
                ) : null}
              </div>

              <div className="meta-pills history-meta-pills">
                <span>{item.model ?? "未知模型"}</span>
                <span>{item.size ?? "未知尺寸"}</span>
                <span>{item.quality ?? "未知质量"}</span>
              </div>

              <div className="history-meta-list">
                <div>
                  <span>格式</span>
                  <strong>{formatOutputFormatLabel(item)}</strong>
                </div>
                <div>
                  <span>背景</span>
                  <strong>{item.background ?? "auto"}</strong>
                </div>
                <div>
                  <span>文件大小</span>
                  <strong>{formatFileSize(item.fileSize)}</strong>
                </div>
              </div>

              <details className="history-disclosure" open>
                <summary>查看提示词</summary>
                <p>{item.prompt}</p>
              </details>

              {item.revisedPrompt ? (
                <details className="history-disclosure">
                  <summary>查看模型调整后的提示词</summary>
                  <p>{item.revisedPrompt}</p>
                </details>
              ) : null}

              <div className="history-actions">
                <a
                  className="ghost-button"
                  href={item.imageUrl}
                  target="_blank"
                  rel="noreferrer"
                >
                  查看原图
                </a>
                <a className="primary-button history-download-button" href={item.downloadUrl}>
                  下载图片
                </a>
              </div>
            </article>
          ))}
        </section>
      )}
    </div>
  );
}

function formatFileSize(fileSize: number): string {
  if (fileSize < 1024) {
    return `${fileSize} B`;
  }

  if (fileSize < 1024 * 1024) {
    return `${(fileSize / 1024).toFixed(1)} KB`;
  }

  return `${(fileSize / (1024 * 1024)).toFixed(2)} MB`;
}

function formatOutputFormatLabel(item: ImageHistoryItem): string {
  if (item.outputFormat) {
    return item.outputFormat.toUpperCase();
  }

  return item.mimeType.replace(/^image\//, "").toUpperCase();
}