import { useEffect, useState } from 'react';
import { useParams, Link } from 'react-router-dom';
import { useBotStore, type Bot, type SlashCommand } from '../stores/bot.ts';
import { useServerStore } from '../stores/server.ts';

export function CommandManager() {
  const { id: botId } = useParams<{ id: string }>();

  const fetchCommands = useBotStore((s) => s.fetchCommands);
  const createCommand = useBotStore((s) => s.createCommand);
  const deleteCommand = useBotStore((s) => s.deleteCommand);
  const bots = useBotStore((s) => s.bots);
  const fetchBots = useBotStore((s) => s.fetchBots);
  const error = useBotStore((s) => s.error);

  const servers = useServerStore((s) => s.servers);
  const fetchServers = useServerStore((s) => s.fetchServers);

  const [commands, setCommands] = useState<SlashCommand[]>([]);
  const [loading, setLoading] = useState(false);
  const [bot, setBot] = useState<Bot | null>(null);

  const [showAdd, setShowAdd] = useState(false);
  const [cmdName, setCmdName] = useState('');
  const [cmdDesc, setCmdDesc] = useState('');
  const [cmdServer, setCmdServer] = useState('');

  useEffect(() => {
    fetchServers();
    fetchBots();
  }, [fetchServers, fetchBots]);

  useEffect(() => {
    if (!botId) return;
    const found = bots.find((b) => b.id === botId);
    if (found) setBot(found);
  }, [bots, botId]);

  const loadCommands = async () => {
    if (!botId) return;
    setLoading(true);
    const cmds = await fetchCommands(botId);
    setCommands(cmds);
    setLoading(false);
  };

  useEffect(() => {
    loadCommands();
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [botId]);

  const handleAdd = async (e: React.FormEvent) => {
    e.preventDefault();
    if (!botId || !cmdName.trim() || !cmdServer) return;
    try {
      const cmd = await createCommand(botId, cmdServer, cmdName.trim(), cmdDesc.trim());
      setCommands((prev) => [...prev, cmd]);
      setCmdName('');
      setCmdDesc('');
      setCmdServer('');
      setShowAdd(false);
    } catch {
      // error in store
    }
  };

  const handleDelete = async (cmdId: string) => {
    if (!botId) return;
    if (!window.confirm('Delete this command?')) return;
    try {
      await deleteCommand(botId, cmdId);
      setCommands((prev) => prev.filter((c) => c.id !== cmdId));
    } catch {
      // error in store
    }
  };

  const getServerName = (serverId: string) => {
    const s = servers.find((sv) => sv.id === serverId);
    return s ? s.name : serverId.slice(0, 8);
  };

  return (
    <div className="h-full w-full bg-gb-bg p-4 md:p-8 overflow-y-auto">
      <div className="max-w-3xl mx-auto">
        <div className="border border-gb-bg-t p-6">
          <pre className="text-gb-orange font-mono text-center mb-6">
            {'┌──────────────────────────────────┐\n'}
            {'│   === SLASH COMMANDS ===         │\n'}
            {'└──────────────────────────────────┘'}
          </pre>

          {bot && (
            <p className="text-gb-fg-s font-mono text-sm mb-4">
              BOT: <span className="text-gb-green">[{bot.name}]</span>
            </p>
          )}

          {error && (
            <p className="text-gb-red text-sm font-mono mb-4">ERR: {error}</p>
          )}

          {/* Add command form */}
          <div className="mb-6">
            {!showAdd ? (
              <button
                type="button"
                onClick={() => setShowAdd(true)}
                className="terminal-button"
              >
                [ADD COMMAND]
              </button>
            ) : (
              <form onSubmit={handleAdd} className="border border-gb-bg-t p-4 space-y-3">
                <p className="text-gb-aqua font-mono text-sm">{'>'} NEW SLASH COMMAND</p>
                <div>
                  <label className="block text-gb-fg-f mb-1 font-mono text-xs">SERVER:</label>
                  <select
                    value={cmdServer}
                    onChange={(e) => setCmdServer(e.target.value)}
                    className="terminal-input w-full"
                  >
                    <option value="">-- select server --</option>
                    {servers.map((s) => (
                      <option key={s.id} value={s.id}>{s.name}</option>
                    ))}
                  </select>
                </div>
                <div>
                  <label className="block text-gb-fg-f mb-1 font-mono text-xs">COMMAND NAME:</label>
                  <input
                    type="text"
                    value={cmdName}
                    onChange={(e) => setCmdName(e.target.value.replace(/\s/g, '').slice(0, 32))}
                    maxLength={32}
                    className="terminal-input w-full"
                    placeholder="mycommand"
                    autoFocus
                  />
                  <span className="text-gb-fg-f text-xs font-mono mt-1 block">
                    /{cmdName || 'command'}
                  </span>
                </div>
                <div>
                  <label className="block text-gb-fg-f mb-1 font-mono text-xs">DESCRIPTION:</label>
                  <input
                    type="text"
                    value={cmdDesc}
                    onChange={(e) => setCmdDesc(e.target.value.slice(0, 256))}
                    maxLength={256}
                    className="terminal-input w-full"
                    placeholder="what does this command do?"
                  />
                </div>
                <div className="flex gap-2">
                  <button
                    type="submit"
                    className="terminal-button text-xs"
                    disabled={!cmdName.trim() || !cmdServer}
                  >
                    [SAVE]
                  </button>
                  <button
                    type="button"
                    onClick={() => { setShowAdd(false); setCmdName(''); setCmdDesc(''); setCmdServer(''); }}
                    className="text-gb-fg-f hover:text-gb-aqua font-mono text-xs"
                  >
                    [CANCEL]
                  </button>
                </div>
              </form>
            )}
          </div>

          {/* Command list */}
          {loading && (
            <p className="text-gb-fg-f font-mono text-sm">[loading commands...]</p>
          )}
          {!loading && commands.length === 0 && (
            <p className="text-gb-fg-f font-mono text-sm">[no commands registered]</p>
          )}

          <div className="space-y-2">
            {commands.map((cmd) => (
              <div
                key={cmd.id}
                className="border border-gb-bg-t p-3 flex items-start justify-between gap-3"
              >
                <div className="min-w-0">
                  <p className="text-gb-green font-mono text-sm">
                    /{cmd.name}
                  </p>
                  {cmd.description && (
                    <p className="text-gb-fg-f font-mono text-xs mt-1">{cmd.description}</p>
                  )}
                  <p className="text-gb-fg-f font-mono text-xs mt-1">
                    server: <span className="text-gb-aqua">{getServerName(cmd.server_id)}</span>
                  </p>
                </div>
                <button
                  type="button"
                  onClick={() => handleDelete(cmd.id)}
                  className="terminal-button text-xs hover:!text-gb-red shrink-0"
                >
                  [DELETE]
                </button>
              </div>
            ))}
          </div>

          {/* Footer */}
          <div className="mt-6 pt-4 border-t border-gb-bg-t flex justify-between">
            <Link to="/bots" className="text-gb-fg-f hover:text-gb-aqua font-mono text-sm">
              {'<'} [BACK TO BOTS]
            </Link>
            <Link to="/" className="text-gb-fg-f hover:text-gb-aqua font-mono text-sm">
              [CHAT]
            </Link>
          </div>
        </div>
      </div>
    </div>
  );
}