/**
 * # 路由 /admin/media 媒体库
 * 表格 + 缩略图预览；编辑替代文本（alt）与标题。
 */
import { createFileRoute, useRouter } from "@tanstack/react-router";
import { App, Button, Card, Form, Image, Input, Modal, Space, Table, Typography, Upload } from "antd";
import { EditOutlined, SearchOutlined, UploadOutlined } from "@ant-design/icons";
import { File as FileIcon } from "lucide-react";
import { useState } from "react";
import { adminListMedia, adminUpdateMedia, adminUploadMedia } from "~/server/admin";
import { useAdminT } from "~/admin-i18n";
import { AdminEmpty, Forbidden, PageHeader, fmtDateTime, guardAdmin, tablePagination, type AdminSearch } from "~/components/admin/common";
import type { media } from "~/db/schema";

export const Route = createFileRoute("/admin/media")({
  validateSearch: (search: Record<string, unknown>): AdminSearch => {
    // 只保留显式传入的参数，缺省时不回写 URL（避免 307 归一化重定向）
    const out: AdminSearch = {};
    const page = Math.floor(Number(search.page)) || 0;
    if (page > 1) out.page = page;
    if (typeof search.q === "string" && search.q) out.q = search.q;
    return out;
  },
  loaderDeps: ({ search }) => ({ search }),
  loader: ({ deps }) => guardAdmin(() => adminListMedia({ data: { page: deps.search.page, q: deps.search.q || undefined } })),
  component: MediaPage,
});

/** # 成员变量 媒体行类型（来自 media 表结构推断） **/
type MediaRow = typeof media.$inferSelect;

/** # 函数 媒体库页面组件 */
function MediaPage() {
  const t = useAdminT();
  const data = Route.useLoaderData();
  const search = Route.useSearch();
  const navigate = Route.useNavigate();
  const router = useRouter();
  const { message } = App.useApp();
  const [q, setQ] = useState(search.q ?? "");
  /** # 成员变量 当前编辑的媒体记录（null = 关闭弹窗） **/
  const [editing, setEditing] = useState<MediaRow | null>(null);
  const [form] = Form.useForm();

  if (!data) return <Forbidden />;

  /** # 函数 更新查询参数 */
  function updateSearch(patch: AdminSearch) {
    void navigate({ search: (prev) => ({ ...prev, ...patch, page: 1 }) });
  }

  /** # 函数 打开编辑弹窗并回填表单 */
  function openEdit(row: MediaRow) {
    setEditing(row);
    form.setFieldsValue({ altText: row.altText, title: row.title });
  }

  /** # 函数 保存媒体 alt/title */
  async function handleSave(values: { altText?: string; title?: string }) {
    if (!editing) return;
    await adminUpdateMedia({ data: { id: editing.id, altText: values.altText, title: values.title } });
    message.success(t("已保存"));
    setEditing(null);
    await router.invalidate();
  }

  /** # 函数 文件大小格式化（字节 → KB/MB） */
  function fmtSize(n: number | null): string {
    if (!n) return "-";
    if (n >= 1024 * 1024) return `${(n / 1024 / 1024).toFixed(1)} MB`;
    return `${Math.max(1, Math.round(n / 1024))} KB`;
  }

  return (
    <Card size="small">
      <PageHeader
        title={t("媒体库")}
        extra={
          <Space>
            <Input
              allowClear
              placeholder={t("搜索文件路径")}
              prefix={<SearchOutlined aria-hidden />}
              value={q}
              onChange={(e) => setQ(e.target.value)}
              onPressEnter={() => updateSearch({ q })}
              style={{ width: 240 }}
            />
            {/* 上传走 base64 JSON（server fn RPC），单文件 ≤20MB；成功后刷新列表 */}
            <Upload
              multiple
              showUploadList={false}
              customRequest={async ({ file, onSuccess, onError }) => {
                try {
                  const f = file as File;
                  const buf = new Uint8Array(await f.arrayBuffer());
                  // 分块 btoa：直接 btoa(二进制串) 在大文件下栈溢出，按 0x8000 分块
                  let bin = "";
                  const CHUNK = 0x8000;
                  for (let i = 0; i < buf.length; i += CHUNK) bin += String.fromCharCode(...buf.subarray(i, i + CHUNK));
                  const res = await adminUploadMedia({ data: { filename: f.name, mime: f.type || "", dataBase64: btoa(bin) } });
                  message.success(t("已上传 {name}（#{id}）", { name: f.name, id: res.id }));
                  onSuccess?.(res);
                  await router.invalidate();
                } catch (e) {
                  message.error(e instanceof Error ? e.message : t("上传失败"));
                  onError?.(e as Error);
                }
              }}
            >
              <Button type="primary" icon={<UploadOutlined aria-hidden />}>
                {t("上传媒体")}
              </Button>
            </Upload>
          </Space>
        }
      />
      <Table
        rowKey="id"
        size="small"
        dataSource={data.items}
        locale={{ emptyText: <AdminEmpty /> }}
        pagination={tablePagination(data.total, data.page, data.pageSize, (p) =>
          void navigate({ search: (prev) => ({ ...prev, page: p }) }),
        )}
        columns={[
          { title: "ID", dataIndex: "id", width: 70 },
          {
            title: t("预览"),
            dataIndex: "url",
            width: 88,
            render: (v: string, r) =>
              r.mimeType.startsWith("image") ? (
                <Image src={v} alt={r.altText || r.path} width={56} height={56} style={{ objectFit: "cover", borderRadius: 4 }} />
              ) : (
                <FileIcon size={36} aria-hidden color="var(--ant-color-text-quaternary)" />
              ),
          },
          {
            title: t("路径"),
            dataIndex: "path",
            render: (v: string, r) => (
              <Typography.Link href={r.url} target="_blank" style={{ wordBreak: "break-all" }}>
                {v}
              </Typography.Link>
            ),
          },
          { title: t("类型"), dataIndex: "mimeType", width: 140 },
          { title: t("尺寸"), key: "dim", width: 110, render: (_, r) => (r.width ? `${r.width} x ${r.height}` : "-") },
          { title: t("大小"), dataIndex: "size", width: 90, render: (v: number | null) => fmtSize(v) },
          { title: t("引用数"), dataIndex: "refCount", width: 70 },
          { title: t("替代文本"), dataIndex: "altText", ellipsis: true },
          { title: t("上传时间"), dataIndex: "createdAt", width: 160, render: (v: string) => fmtDateTime(v) },
          {
            title: t("操作"),
            key: "actions",
            width: 70,
            render: (_, r) => (
              <Button size="small" type="text" icon={<EditOutlined aria-label={t("编辑")} />} onClick={() => openEdit(r)} />
            ),
          },
        ]}
      />

      <Modal title={t("编辑媒体 #{id}", { id: editing?.id ?? "" })} open={editing !== null} onCancel={() => setEditing(null)} onOk={() => form.submit()} destroyOnHidden>
        <Form form={form} layout="vertical" onFinish={(v) => void handleSave(v)}>
          <Form.Item name="altText" label={t("替代文本（alt）")}>
            <Input />
          </Form.Item>
          <Form.Item name="title" label={t("标题")}>
            <Input />
          </Form.Item>
        </Form>
      </Modal>
    </Card>
  );
}