import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
import { useRef, useState, type FormEvent } from "react";
import { api } from "../../api/client";
import { TopBar } from "../../components/TopBar";
import { toast } from "../../components/Toaster";
import { btn, btnPrimary, card, input } from "../../components/ui";

export default function AdminLibraries() {
  const qc = useQueryClient();
  const libsQ = useQuery({ queryKey: ["libraries"], queryFn: api.listLibraries });
  const [name, setName] = useState("");
  const fileRefs = useRef<Record<number, HTMLInputElement | null>>({});

  const create = useMutation({
    mutationFn: () => api.createLibrary(name.trim()),
    onSuccess: (lib) => {
      toast("ok", `库「${lib.name}」已创建`);
      setName("");
      void qc.invalidateQueries({ queryKey: ["libraries"] });
    },
    onError: (e) => toast("err", e instanceof Error ? e.message : "建库失败"),
  });
  const scan = useMutation({
    mutationFn: (id: number) => api.scanLibrary(id),
    onSuccess: () => {
      toast("ok", "扫描已触发");
      setTimeout(() => void qc.invalidateQueries({ queryKey: ["books"] }), 3000);
    },
    onError: (e) => toast("err", e instanceof Error ? e.message : "扫描失败"),
  });

  async function onFiles(libId: number, list: FileList | null) {
    if (!list?.length) return;
    try {
      for (const f of Array.from(list)) await api.uploadBook(libId, f); // 串行,单个失败即止并报错
      toast("ok", `已上传 ${list.length} 个文件,等待 scanner 收编`);
      void qc.invalidateQueries({ queryKey: ["books"] });
      setTimeout(() => void qc.invalidateQueries({ queryKey: ["books"] }), 5000);
    } catch (e) {
      toast("err", e instanceof Error ? e.message : "上传失败");
    }
  }

  function submit(e: FormEvent) {
    e.preventDefault();
    create.mutate();
  }

  return (
    <div className="flex h-full flex-col">
      <TopBar />
      <div className="flex-1 overflow-y-auto p-4">
        <h1 className="mb-4 text-lg font-semibold">库管理</h1>
        <form onSubmit={submit} className={`${card} mb-6 flex max-w-2xl flex-wrap items-center gap-3 p-4`}>
          <input
            className={input + " flex-1"}
            placeholder="库名(如 comics,服务端目录自动落在 BOOKS_DIR/<库名> 下)"
            value={name}
            onChange={(e) => setName(e.target.value)}
          />
          <button className={btnPrimary} disabled={create.isPending || !name.trim()}>
            {create.isPending ? "创建中…" : "建库"}
          </button>
        </form>
        <div className="flex max-w-2xl flex-col gap-4">
          {(libsQ.data ?? []).map((l) => (
            <div key={l.id} className={`${card} p-4`}>
              <div className="mb-1 flex items-baseline gap-3">
                <span className="font-medium">{l.name}</span>
                <span className="text-xs text-zinc-500">#{l.id}</span>
              </div>
              <p className="mb-3 text-xs break-all text-zinc-500">{l.root_path}</p>
              <div className="flex flex-wrap items-center gap-3">
                <button className={btn} disabled={scan.isPending} onClick={() => scan.mutate(l.id)}>
                  {scan.isPending ? "扫描中…" : "扫描"}
                </button>
                <input
                  ref={(el) => {
                    fileRefs.current[l.id] = el;
                  }}
                  type="file"
                  multiple
                  accept=".cbz,.zip,.pdf,.epub,.txt,.md"
                  className="hidden"
                  onChange={(e) => {
                    void onFiles(l.id, e.target.files);
                    e.target.value = "";
                  }}
                />
                <button className={btn} onClick={() => fileRefs.current[l.id]?.click()}>
                  上传文件
                </button>
                <span className="text-xs text-zinc-600">白名单:cbz/zip/pdf/epub/txt/md</span>
              </div>
            </div>
          ))}
          {(libsQ.data ?? []).length === 0 && !libsQ.isPending && (
            <p className="text-sm text-zinc-500">还没有库,用上方表单创建。</p>
          )}
        </div>
      </div>
    </div>
  );
}