import React, { useState } from 'react';
import styles from './Tabs.module.css';

export interface Tab {
  id: string;
  label: string;
  content: React.ReactNode;
}

export interface TabsProps {
  tabs: Tab[];
  defaultTabId?: string;
  /** Controlled active tab. When provided, internal state is ignored. */
  activeTabId?: string;
  onTabChange?: (tabId: string) => void;
  className?: string;
}

export function Tabs({ tabs, defaultTabId, activeTabId: controlledTabId, onTabChange, className = '' }: TabsProps) {
  const [internalTabId, setInternalTabId] = useState<string>(
    defaultTabId || tabs[0]?.id || ''
  );

  const activeTabId = controlledTabId ?? internalTabId;

  const handleTabClick = (tabId: string) => {
    if (!controlledTabId) setInternalTabId(tabId);
    onTabChange?.(tabId);
  };

  const activeTab = tabs.find(tab => tab.id === activeTabId) || tabs[0];

  if (!tabs || tabs.length === 0) {
    return null;
  }

  return (
    <div className={`${styles.tabsContainer} ${className}`}>
      <div className={styles.tabsHeader}>
        {tabs.map(tab => (
          <button
            key={tab.id}
            className={`${styles.tabButton} ${activeTabId === tab.id ? styles.tabButtonActive : ''}`}
            onClick={() => handleTabClick(tab.id)}
            type="button"
          >
            {tab.label}
          </button>
        ))}
      </div>
      <div className={styles.tabsContent}>
        {activeTab && activeTab.content}
      </div>
    </div>
  );
}

export default Tabs;