import { useRef } from 'react';
import { SendHorizontal, Square, X, Paperclip, FileText, Film, Music, FileArchive, File, Loader2, AtSign } from 'lucide-react';
import type { AttachedFileMeta } from '../../shared/chat-model';
import { useI18n } from '../../i18n';

type ChatComposerProps = {
  value: string;
  isSending: boolean;
  attachments: AttachedFileMeta[];
  error?: string | null;
  onChange: (value: string) => void;
  onSend: () => void;
  onStop: () => void;
  onAttach: (files: File[]) => void | Promise<void>;
  onRemoveAttachment: (index: number) => void;
  onDismissError?: () => void;
};

export default function ChatComposer({
  value,
  isSending,
  attachments,
  error,
  onChange,
  onSend,
  onStop,
  onAttach,
  onRemoveAttachment,
  onDismissError,
}: ChatComposerProps) {
  const fileInputRef = useRef<HTMLInputElement | null>(null);
  const { t } = useI18n();

  return (
    <div className="border-t border-[#edf2f7] p-4 dark:border-[#2a2a2d]">
      <div className="rounded-xl border border-[#dfeaf6] bg-white p-4 shadow-[0_10px_30px_rgba(15,23,42,0.04)] dark:border-[#2a2a2d] dark:bg-[#1f1f22]">
        <div className="flex items-start gap-3">
          <div className="min-w-0 flex-1">
            {error ? (
              <div className="mb-3 flex items-center justify-between gap-3 rounded-[14px] border border-[#fecaca] bg-[#fff1f2] px-4 py-3 text-sm text-[#b91c1c] dark:border-[#7f1d1d] dark:bg-[#2d1618] dark:text-[#fca5a5]">
                <span className="min-w-0 flex-1">{error}</span>
                {onDismissError ? (
                  <button type="button" className="text-xs transition-colors hover:text-[#7f1d1d]" onClick={onDismissError}>
                    {t('conversation.composer.dismissError')}
                  </button>
                ) : null}
              </div>
            ) : null}
            <textarea
              className="min-h-30 w-full resize-none text-sm text-[#171717] outline-none transition-colors placeholder:text-[#99A0AE] focus:border-[#2B7FFF] dark:border-[#2a2a2d] dark:bg-[#232327] dark:text-gray-100 dark:placeholder:text-gray-500"
              placeholder={t('conversation.composer.placeholder')}
              value={value}
              onChange={(event) => onChange(event.target.value)}
              onKeyDown={(event) => {
                if (event.key === 'Enter' && !event.shiftKey) {
                  event.preventDefault();
                  if (isSending) {
                    onStop();
                    return;
                  }
                  onSend();
                }
              }}
            />
            {attachments.length > 0 ? (
              <div className="w-full flex justify-between">
                {attachments.map((attachment, index) => (
                  <div
                    key={attachment.filePath || `${attachment.fileName}-${index}`}
                    className="flex items-center gap-2 rounded-full border border-[#E5E8EE] bg-white px-3 py-1.5 text-xs text-[#525866] dark:border-[#2a2a2d] dark:bg-[#232327] dark:text-gray-300"
                  >
                    <span className="max-w-45 truncate">{attachment.fileName}</span>
                    <button
                      type="button"
                      className="text-[#99A0AE] transition-colors hover:text-[#ef4444]"
                      onClick={() => onRemoveAttachment(index)}
                    >
                      x
                    </button>
                  </div>
                ))}
              </div>
            ) : null}
            <div className="w-full flex justify-between">
              <input
                ref={fileInputRef}
                hidden
                multiple
                type="file"
                onChange={(event) => {
                  const files = Array.from(event.target.files || []);
                  if (files.length > 0) {
                    void onAttach(files);
                  }
                  event.currentTarget.value = '';
                }}
              />
              <button
                type="button"
                className="p-3 text-xs text-[#525866] transition-colors hover:border-[#2B7FFF] hover:text-[#2B7FFF] dark:border-[#2a2a2d] dark:text-gray-300"
                onClick={() => fileInputRef.current?.click()}
              >
                <Paperclip className="h-4 w-4" />
              </button>
              <button
                type="button"
                className="rounded-lg border border-[#E5E8EE] p-3 text-xs text-[#525866] transition-colors hover:border-[#2B7FFF] hover:text-[#2B7FFF] dark:border-[#2a2a2d] dark:text-gray-300"
                onClick={isSending ? onStop : onSend}
              >
                {isSending ? <Square className="h-4 w-4" /> : <SendHorizontal className="h-4 w-4" />}
              </button>
            </div>
          </div>
        </div>
      </div>
    </div>
  );
}