"use client";

import { useState, useEffect, useCallback } from "react";
import { useRouter } from "next/navigation";
import { c2api } from "@/lib/c2api";
import { useAuth } from "@/components/AuthProvider";

interface TokenRecord {
  token_id: string;
  name: string;
  token: string; // masked server-side
  in_use: boolean;
  assigned_node_id: string | null;
  assigned_at: string | null;
}

export default function TokensPage() {
  const { isAdmin, loading: authLoading } = useAuth();
  const router = useRouter();
  const [tokens, setTokens] = useState<TokenRecord[]>([]);
  const [loading, setLoading] = useState(true);
  const [showAdd, setShowAdd] = useState(false);
  const [name, setName] = useState("");
  const [token, setToken] = useState("");
  const [saving, setSaving] = useState(false);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    if (!authLoading && !isAdmin) router.replace("/dashboard");
  }, [authLoading, isAdmin, router]);

  const refresh = useCallback(async () => {
    try {
      const data = await c2api.getTokens();
      setTokens(data as TokenRecord[]);
    } finally {
      setLoading(false);
    }
  }, []);

  useEffect(() => { refresh(); }, [refresh]);

  async function handleAdd(e: React.FormEvent) {
    e.preventDefault();
    setSaving(true);
    setError(null);
    try {
      await c2api.addToken({ name, token });
      setName("");
      setToken("");
      setShowAdd(false);
      await refresh();
    } catch (err) {
      setError(err instanceof Error ? err.message : "Failed to add token.");
    } finally {
      setSaving(false);
    }
  }

  async function handleDelete(id: string) {
    if (!confirm("Remove this token from the pool?")) return;
    try {
      await c2api.deleteToken(id);
      await refresh();
    } catch (err) {
      alert(err instanceof Error ? err.message : "Delete failed.");
    }
  }

  if (authLoading || !isAdmin) return null;

  return (
    <div className="space-y-6 max-w-2xl">
      <div className="flex items-center justify-between">
        <div>
          <h1 className="text-xl font-bold text-white font-mono">Bot Token Pool</h1>
          <p className="text-xs text-gray-500 font-mono mt-0.5">
            Discord bot tokens assigned to nodes when they join a voice channel.
          </p>
        </div>
        <button
          onClick={() => setShowAdd(!showAdd)}
          className="bg-indigo-600 hover:bg-indigo-500 text-white px-4 py-2 rounded-lg text-sm font-mono transition-colors"
        >
          + Add Token
        </button>
      </div>

      {showAdd && (
        <form onSubmit={handleAdd} className="bg-gray-900 border border-gray-700 rounded-xl p-5 space-y-4 font-mono">
          <h3 className="text-white font-semibold text-sm">Add Token</h3>
          <div>
            <label className="text-xs text-gray-400 block mb-1">Label</label>
            <input
              value={name}
              onChange={(e) => setName(e.target.value)}
              required
              className="w-full bg-gray-800 border border-gray-700 rounded-lg px-3 py-2 text-white text-sm focus:outline-none focus:border-indigo-500"
              placeholder="DRB Bot 1"
            />
          </div>
          <div>
            <label className="text-xs text-gray-400 block mb-1">Discord Bot Token</label>
            <input
              value={token}
              onChange={(e) => setToken(e.target.value)}
              required
              type="password"
              className="w-full bg-gray-800 border border-gray-700 rounded-lg px-3 py-2 text-white text-sm font-mono focus:outline-none focus:border-indigo-500"
              placeholder="MTxxxxxxxxxx.Gxxxxx.xxxxxxxxxx"
            />
          </div>
          {error && <p className="text-red-400 text-xs">{error}</p>}
          <div className="flex gap-3">
            <button
              type="submit"
              disabled={saving}
              className="flex-1 bg-indigo-600 hover:bg-indigo-500 disabled:opacity-50 text-white rounded-lg py-2 text-sm font-semibold transition-colors"
            >
              {saving ? "Saving…" : "Save"}
            </button>
            <button
              type="button"
              onClick={() => setShowAdd(false)}
              className="flex-1 bg-gray-800 hover:bg-gray-700 text-gray-300 rounded-lg py-2 text-sm transition-colors"
            >
              Cancel
            </button>
          </div>
        </form>
      )}

      {loading ? (
        <p className="text-gray-600 text-sm font-mono">Loading…</p>
      ) : tokens.length === 0 ? (
        <p className="text-gray-600 text-sm font-mono">No tokens in the pool. Add one to enable Discord voice streaming.</p>
      ) : (
        <div className="border border-gray-800 rounded-lg overflow-hidden font-mono">
          <table className="w-full text-sm">
            <thead>
              <tr className="bg-gray-900 text-xs text-gray-500 uppercase tracking-wider">
                <th className="px-4 py-2.5 text-left">Label</th>
                <th className="px-4 py-2.5 text-left">Token</th>
                <th className="px-4 py-2.5 text-left">Status</th>
                <th className="px-4 py-2.5 text-left">Node</th>
                <th className="px-4 py-2.5 w-16"></th>
              </tr>
            </thead>
            <tbody>
              {tokens.map((t) => (
                <tr key={t.token_id} className="border-t border-gray-800 hover:bg-gray-900/50">
                  <td className="px-4 py-2.5 text-white">{t.name}</td>
                  <td className="px-4 py-2.5 text-gray-500 text-xs">{t.token}</td>
                  <td className="px-4 py-2.5">
                    {t.in_use ? (
                      <span className="text-xs text-green-400 bg-green-400/10 px-2 py-0.5 rounded">In use</span>
                    ) : (
                      <span className="text-xs text-gray-500 bg-gray-800 px-2 py-0.5 rounded">Free</span>
                    )}
                  </td>
                  <td className="px-4 py-2.5 text-gray-500 text-xs">
                    {t.assigned_node_id ?? "—"}
                  </td>
                  <td className="px-4 py-2.5 text-right">
                    <button
                      onClick={() => handleDelete(t.token_id)}
                      disabled={t.in_use}
                      className="text-xs text-red-600 hover:text-red-400 disabled:opacity-30 disabled:cursor-not-allowed transition-colors"
                    >
                      Remove
                    </button>
                  </td>
                </tr>
              ))}
            </tbody>
          </table>
        </div>
      )}
    </div>
  );
}