// Core Utilities Module v2.5.0
const CoreUtils = {
    async validateAddress(address) {
        try {
            const pattern = /^(0x)?[0-9a-fA-F]{40}$/;
            return pattern.test(address) && await this.checksumAddress(address);
        } catch (e) {
            console.error('Address validation failed:', e);
            return false;
        }
    },

    async checksumAddress(address) {
        const addr = address.toLowerCase().replace('0x', '');
        const hash = await this.keccak256(addr);
        let ret = '0x';
        
        for (let i = 0; i < addr.length; i++) {
            if (parseInt(hash[i], 16) >= 8) {
                ret += addr[i].toUpperCase();
            } else {
                ret += addr[i];
            }
        }
        return ret;
    },

    async keccak256(input) {
        const encoder = new TextEncoder();
        const data = encoder.encode(input);
        return await crypto.subtle.digest('SHA-256', data);
    },

    formatBalance(balance, decimals = 18) {
        return (BigInt(balance) / BigInt(10 ** decimals)).toString();
    },

    async verifySignature(message, signature, address) {
        try {
            const hash = await this.keccak256(message);
            const recoveredAddr = await this._recoverAddress(hash, signature);
            return recoveredAddr.toLowerCase() === address.toLowerCase();
        } catch {
            return false;
        }
    }
};

export default CoreUtils;