import { FormEvent, useState } from "react";
import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";

import { api } from "../../api/client";
import { Page } from "../../components/Page";
import { Table } from "../../components/Table";

const columns = [
  { key: "username", label: "Username" },
  { key: "name", label: "Display name" },
  { key: "role", label: "Role" },
  { key: "status", label: "Status" }
];

export function UsersPage() {
  const queryClient = useQueryClient();
  const query = useQuery({
    queryKey: ["users"],
    queryFn: api.users
  });
  const [form, setForm] = useState({
    username: "",
    display_name: "",
    email: "",
    password: "",
    role: "user"
  });

  const createMutation = useMutation({
    mutationFn: api.createUser,
    onSuccess: () => {
      setForm({ username: "", display_name: "", email: "", password: "", role: "user" });
      void queryClient.invalidateQueries({ queryKey: ["users"] });
    }
  });

  const rows = query.data?.map((user) => ({
    username: user.username,
    name: user.display_name,
    role: user.role,
    status: user.is_active ? "active" : "disabled"
  })) ?? [];

  function onSubmit(event: FormEvent) {
    event.preventDefault();
    createMutation.mutate(form);
  }

  return (
    <Page
      title="Users"
      subtitle="Create, disable, and manage platform identities."
      actions={<span className="pill">Admin managed</span>}
    >
      <form className="inline-form" onSubmit={onSubmit}>
        <input placeholder="username" value={form.username} onChange={(event) => setForm((value) => ({ ...value, username: event.target.value }))} />
        <input placeholder="display name" value={form.display_name} onChange={(event) => setForm((value) => ({ ...value, display_name: event.target.value }))} />
        <input placeholder="email" value={form.email} onChange={(event) => setForm((value) => ({ ...value, email: event.target.value }))} />
        <input placeholder="password" type="password" value={form.password} onChange={(event) => setForm((value) => ({ ...value, password: event.target.value }))} />
        <select value={form.role} onChange={(event) => setForm((value) => ({ ...value, role: event.target.value }))}>
          <option value="user">user</option>
          <option value="admin">admin</option>
        </select>
        <button className="button" type="submit" disabled={createMutation.isPending}>Create user</button>
      </form>
      {query.isError ? <p className="notice">Unable to load users from the API.</p> : null}
      {createMutation.isError ? <p className="notice">Unable to create user.</p> : null}
      <Table
        columns={columns}
        rows={rows}
        renderCell={(row, column) => <span>{row[column.key as keyof (typeof rows)[number]]}</span>}
      />
    </Page>
  );
}