"use client";

import { useRouter } from "next/navigation";
import { useState, type FormEvent } from "react";
import { ActionButton } from "@/components/ActionButton";
import { apiFetch, errorMessage } from "@/lib/client-api";
import type { Account, Role } from "@/lib/types";

const ROLES: { value: Role; label: string }[] = [
  { value: "viewer", label: "leitura" },
  { value: "admin", label: "admin" },
  { value: "owner", label: "owner" },
];

export type UserOption = { id: number; name: string };

function UserSelect({
  users,
  value,
  onChange,
  label,
}: {
  users: UserOption[];
  value: number | null;
  onChange: (id: number | null) => void;
  label: string;
}) {
  return (
    <select value={value ?? ""} onChange={(e) => onChange(e.target.value ? Number(e.target.value) : null)} aria-label={label}>
      <option value="">Sem usuário ligado</option>
      {users.map((u) => (
        <option key={u.id} value={u.id}>
          {u.name}
        </option>
      ))}
    </select>
  );
}

export function CreateAccountForm({ users }: { users: UserOption[] }) {
  const router = useRouter();
  const [username, setUsername] = useState("");
  const [password, setPassword] = useState("");
  const [role, setRole] = useState<Role>("admin");
  const [userId, setUserId] = useState<number | null>(null);
  const [message, setMessage] = useState<{ ok: boolean; text: string } | null>(null);
  const [busy, setBusy] = useState(false);

  async function submit(e: FormEvent) {
    e.preventDefault();
    setBusy(true);
    setMessage(null);
    try {
      await apiFetch("/accounts", { method: "POST", body: { username, password, role, user_id: userId } });
      setUsername("");
      setUserId(null);
      setPassword("");
      setMessage({ ok: true, text: "Conta criada." });
      router.refresh();
    } catch (err) {
      setMessage({ ok: false, text: errorMessage(err) });
    } finally {
      setBusy(false);
    }
  }

  return (
    <form className="inline-form" onSubmit={submit} autoComplete="off">
      <label className="field">
        <span>Usuário</span>
        <input value={username} onChange={(e) => setUsername(e.target.value)} pattern="[a-zA-Z0-9._-]{3,50}" required />
      </label>
      <label className="field">
        <span>Senha (mínimo 12 caracteres)</span>
        <input type="password" value={password} onChange={(e) => setPassword(e.target.value)} minLength={12} autoComplete="new-password" required />
      </label>
      <label className="field">
        <span>Papel</span>
        <select value={role} onChange={(e) => setRole(e.target.value as Role)}>
          {ROLES.map((r) => (
            <option key={r.value} value={r.value}>
              {r.label}
            </option>
          ))}
        </select>
      </label>
      <label className="field">
        <span>Usuário do Telegram (leitura só vê este)</span>
        <UserSelect users={users} value={userId} onChange={setUserId} label="Usuário do Telegram" />
      </label>
      <button className="btn primary" type="submit" disabled={busy}>
        Criar
      </button>
      {message && <p className={message.ok ? "ok-text" : "error-text"}>{message.text}</p>}
    </form>
  );
}

export function AccountActions({ account, isSelf, users }: { account: Account; isSelf: boolean; users: UserOption[] }) {
  const router = useRouter();
  const [error, setError] = useState("");

  async function changeRole(role: Role) {
    setError("");
    try {
      await apiFetch(`/accounts/${account.id}`, { method: "PATCH", body: { role } });
      router.refresh();
    } catch (err) {
      setError(errorMessage(err));
    }
  }

  async function changeUser(userId: number | null) {
    setError("");
    try {
      await apiFetch(`/accounts/${account.id}`, { method: "PATCH", body: { user_id: userId } });
      router.refresh();
    } catch (err) {
      setError(errorMessage(err));
    }
  }

  async function resetPassword() {
    const password = window.prompt(`Nova senha para ${account.username} (mínimo 12 caracteres):`);
    if (!password) return;
    setError("");
    try {
      await apiFetch(`/accounts/${account.id}/reset-password`, { method: "POST", body: { password } });
      window.alert("Senha redefinida. As sessões abertas dessa conta foram encerradas.");
    } catch (err) {
      setError(errorMessage(err));
    }
  }

  return (
    <div className="actions">
      <select value={account.role} onChange={(e) => changeRole(e.target.value as Role)} aria-label="Papel">
        {ROLES.map((r) => (
          <option key={r.value} value={r.value}>
            {r.label}
          </option>
        ))}
      </select>
      <UserSelect users={users} value={account.user_id} onChange={changeUser} label="Usuário do Telegram" />
      <button type="button" className="btn secondary" onClick={resetPassword}>
        Redefinir senha
      </button>
      {!isSelf &&
        (account.disabled ? (
          <ActionButton path={`/accounts/${account.id}`} method="PATCH" body={{ disabled: false }} label="Reativar" />
        ) : (
          <ActionButton
            path={`/accounts/${account.id}`}
            method="PATCH"
            body={{ disabled: true }}
            label="Desativar"
            variant="danger"
            confirm={`Desativar a conta ${account.username}? As sessões abertas serão encerradas.`}
          />
        ))}
      {error && <span className="error-text">{error}</span>}
    </div>
  );
}