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

export default function AdminUsers() {
  const qc = useQueryClient();
  const { user: me } = useAuth();
  const usersQ = useQuery({ queryKey: ["users"], queryFn: api.listUsers });
  const [u, setU] = useState("");
  const [p, setP] = useState("");
  const [role, setRole] = useState<"member" | "admin">("member");

  const create = useMutation({
    mutationFn: () => api.createUser(u.trim(), p, role),
    onSuccess: () => {
      toast("ok", "用户已创建");
      setU("");
      setP("");
      void qc.invalidateQueries({ queryKey: ["users"] });
    },
    onError: (e) => toast("err", e instanceof Error ? e.message : "创建失败"),
  });
  const del = useMutation({
    mutationFn: (id: number) => api.deleteUser(id),
    onSuccess: () => {
      toast("ok", "用户已删除(其阅读进度一并删除)");
      void qc.invalidateQueries({ queryKey: ["users"] });
    },
    onError: (e) => toast("err", e instanceof Error ? e.message : "删除失败"),
  });

  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">用户管理</h1>
        <form onSubmit={submit} className={`${card} mb-6 flex max-w-2xl flex-wrap items-center gap-3 p-4`}>
          <input className={input} placeholder="用户名" value={u} onChange={(e) => setU(e.target.value)} />
          <input className={input} type="password" placeholder="密码(≥8 位)" value={p} onChange={(e) => setP(e.target.value)} />
          <select className={input} value={role} onChange={(e) => setRole(e.target.value as "member" | "admin")}>
            <option value="member">member</option>
            <option value="admin">admin</option>
          </select>
          <button className={btnPrimary} disabled={create.isPending || !u.trim() || p.length < 8}>
            {create.isPending ? "创建中…" : "创建"}
          </button>
        </form>
        <table className="w-full max-w-2xl text-sm">
          <thead className="text-left text-zinc-500">
            <tr>
              <th className="py-1">ID</th>
              <th>用户名</th>
              <th>角色</th>
              <th>创建时间</th>
              <th />
            </tr>
          </thead>
          <tbody>
            {(usersQ.data ?? []).map((x) => (
              <tr key={x.id} className="border-t border-zinc-800">
                <td className="py-1 text-zinc-500">{x.id}</td>
                <td>{x.username}</td>
                <td>{x.role}</td>
                <td className="text-zinc-500">{x.created_at.slice(0, 19).replace("T", " ")}</td>
                <td className="py-1 text-right">
                  <button
                    className={btn + " text-red-300"}
                    disabled={x.id === me?.id}
                    title={x.id === me?.id ? "不能删除自己" : undefined}
                    onClick={() => {
                      if (confirm(`删除用户 ${x.username}?`)) del.mutate(x.id);
                    }}
                  >
                    删除
                  </button>
                </td>
              </tr>
            ))}
          </tbody>
        </table>
      </div>
    </div>
  );
}