use alloy_primitives::{aliases::U24, Address, Keccak256, U256};
use num_bigint::BigUint;
use tycho_core::Bytes;

use crate::encoding::errors::EncodingError;

/// Safely converts a `Bytes` object to an `Address` object.
///
/// Checks the length of the `Bytes` before attempting to convert, and returns an `EncodingError`
/// if not 20 bytes long.
pub fn bytes_to_address(address: &Bytes) -> Result<Address, EncodingError> {
    if address.len() == 20 {
        Ok(Address::from_slice(address))
    } else {
        Err(EncodingError::InvalidInput(format!("Invalid address: {:?}", address)))
    }
}

pub fn biguint_to_u256(value: &BigUint) -> U256 {
    let bytes = value.to_bytes_be();
    U256::from_be_slice(&bytes)
}

pub fn encode_input(selector: &str, mut encoded_args: Vec<u8>) -> Vec<u8> {
    let mut hasher = Keccak256::new();
    hasher.update(selector.as_bytes());
    let selector_bytes = &hasher.finalize()[..4];
    let mut call_data = selector_bytes.to_vec();
    // Remove extra prefix if present (32 bytes for dynamic data)
    // Alloy encoding is including a prefix for dynamic data indicating the offset or length
    // but at this point we don't want that
    if encoded_args.len() > 32 &&
        encoded_args[..32] ==
            [0u8; 31]
                .into_iter()
                .chain([32].to_vec())
                .collect::<Vec<u8>>()
    {
        encoded_args = encoded_args[32..].to_vec();
    }
    call_data.extend(encoded_args);
    call_data
}

/// Converts a decimal to a `U24` value. The percentage is a `f64` value between 0 and 1.
/// MAX_UINT24 corresponds to 100%.
pub fn percentage_to_uint24(decimal: f64) -> U24 {
    const MAX_UINT24: u32 = 16_777_215; // 2^24 - 1

    let scaled = (decimal / 1.0) * (MAX_UINT24 as f64);
    U24::from(scaled.round())
}