import { useState, useEffect } from 'react';
import type { ColorSchemeConfig, CurrentState } from './types';

const api = typeof window !== 'undefined' ? window.colorSchemeApi : null;

// react hook for color scheme management
export function useColorScheme() {
    const [{ config, resolved }, setScheme] = useState<CurrentState>({
        config: 'system',
        resolved: 'light',
    });

    useEffect(() => {
        // eslint-disable-next-line react-hooks/set-state-in-effect
        setScheme(api!.currentState);
        return api!.subscribe((currentState) => setScheme(currentState));
    }, []);

    return {
        configScheme: config,
        resolvedScheme: resolved,
        setColorScheme: (config: ColorSchemeConfig) => {
            if (!api) return;
            api.config = config;
        },
        isLight: resolved === 'light',
        isDark: resolved === 'dark',
        rootCssClass: api?.getRootCssClass(resolved) || '',
    };
}