import CryptoJS from 'crypto-js';

export function encodeNum(num) {
    if (num === 0) return Buffer.alloc(0);

    const absNum = Math.abs(num);
    const negative = num < 0;
    const result = [];
    let currentNum = absNum;

    while (currentNum) {
        result.push(currentNum & 0xff);
        currentNum >>>= 8;
    }

    if (result[result.length - 1] & 0x80) {
        if (negative) {
            result.push(0x80);
        } else {
            result.push(0);
        }
    } else if (negative) {
        result[result.length - 1] |= 0x80;
    }

    return Buffer.from(result);

}

export function decodeNum(buffer) {
    if (buffer.length === 0) return 0;

    const bigEndian = Buffer.from(buffer).reverse();
    let result = 0;
    const negative = bigEndian[0] & 0x80;

    if (negative) {
        result = bigEndian[0] & 0x7f;
    } else {
        result = bigEndian[0];
    }

    for (let i = 1; i < bigEndian.length; i++) {
        result <<= 8;
        result += bigEndian[i];
    }

    if (negative) {
        return -result;
    } else {
        return result;
    }

}

export const OP_ADD = (stack) => {
    // TODO: Implement OP_ADD
}

export const OP_HASH160 = (stack) => {
    // TODO: Implement OP_HASH160
}

export const OP_CODE_FUNCTIONS = {
    OP_ADD,
    OP_HASH160
    // Add more opcodes here
}