import React, { useEffect, useRef } from 'react';
import { gsap } from 'gsap';

/**
 * AnimatedNumber - A reusable component that animates numbers from 0 to their target value using GSAP
 * @param {number|string} value - The target value to animate to
 * @param {number} duration - Animation duration in seconds (default: 2)
 * @param {string} prefix - Optional prefix (e.g., "$")
 * @param {string} suffix - Optional suffix (e.g., "%", "K", "M")
 * @param {number} decimals - Number of decimal places (default: 0)
 * @param {boolean} useLocaleString - Whether to format with commas (default: false)
 * @param {string} className - Additional CSS classes
 */
const AnimatedNumber = ({
    value,
    duration = 2,
    prefix = '',
    suffix = '',
    decimals = 0,
    useLocaleString = false,
    className = '',
    delay = 0
}) => {
    const numberRef = useRef(null);
    const animationRef = useRef(null);

    useEffect(() => {
        if (!numberRef.current) return;

        // Extract numeric value if it's a string like "$4.2M"
        let numericValue = value;
        let extractedPrefix = prefix;
        let extractedSuffix = suffix;

        if (typeof value === 'string') {
            // Check for currency symbols
            if (value.startsWith('$')) {
                extractedPrefix = '$';
                value = value.substring(1);
            }

            // Check for suffixes like M, K, B
            const lastChar = value.slice(-1);
            if (['K', 'M', 'B'].includes(lastChar.toUpperCase())) {
                extractedSuffix = lastChar.toUpperCase();
                value = value.slice(0, -1);
            }

            // Parse the numeric part
            numericValue = parseFloat(value.replace(/,/g, ''));
        }

        // Handle non-numeric values
        if (isNaN(numericValue)) {
            numberRef.current.textContent = value;
            return;
        }

        // Convert suffix multipliers to actual numbers
        let multiplier = 1;
        if (extractedSuffix === 'K') multiplier = 1000;
        if (extractedSuffix === 'M') multiplier = 1000000;
        if (extractedSuffix === 'B') multiplier = 1000000000;

        const targetValue = numericValue * multiplier;

        // Animate from 0 to target value
        const obj = { val: 0 };

        animationRef.current = gsap.to(obj, {
            val: numericValue,
            duration: duration,
            delay: delay,
            ease: 'expo.out',
            onUpdate: () => {
                if (numberRef.current) {
                    let displayValue = obj.val.toFixed(decimals);

                    if (useLocaleString) {
                        displayValue = parseFloat(displayValue).toLocaleString(undefined, {
                            minimumFractionDigits: decimals,
                            maximumFractionDigits: decimals
                        });
                    }

                    numberRef.current.textContent = `${extractedPrefix}${displayValue}${extractedSuffix}`;
                }
            },
            onComplete: () => {
                // Ensure final value is exact
                if (numberRef.current) {
                    let displayValue = numericValue.toFixed(decimals);

                    if (useLocaleString) {
                        displayValue = parseFloat(displayValue).toLocaleString(undefined, {
                            minimumFractionDigits: decimals,
                            maximumFractionDigits: decimals
                        });
                    }

                    numberRef.current.textContent = `${extractedPrefix}${displayValue}${extractedSuffix}`;
                }
            }
        });

        return () => {
            if (animationRef.current) {
                animationRef.current.kill();
            }
        };
    }, [value, duration, prefix, suffix, decimals, useLocaleString, delay]);

    return <span ref={numberRef} className={className}>0</span>;
};

export default AnimatedNumber;