/**
 * Theme Hook - Manages dark/light mode
 */

import { useState, useEffect } from 'react';

type Theme = 'light' | 'dark';

export function useTheme() {
  const [theme, setTheme] = useState<Theme>(() => {
    // Check localStorage first
    const stored = localStorage.getItem('theme') as Theme | null;
    if (stored) return stored;

    // Check system preference
    if (window.matchMedia('(prefers-color-scheme: dark)').matches) {
      return 'dark';
    }

    // Default to dark for trading platform
    return 'dark';
  });

  useEffect(() => {
    const root = window.document.documentElement;

    // Remove both classes first
    root.classList.remove('light', 'dark');

    // Add the current theme class
    root.classList.add(theme);

    // Store in localStorage
    localStorage.setItem('theme', theme);
  }, [theme]);

  const toggleTheme = () => {
    setTheme((prev) => (prev === 'dark' ? 'light' : 'dark'));
  };

  const setDarkMode = () => setTheme('dark');
  const setLightMode = () => setTheme('light');

  return {
    theme,
    isDark: theme === 'dark',
    isLight: theme === 'light',
    toggleTheme,
    setDarkMode,
    setLightMode,
  };
}