use std::fmt::{Display, Formatter};
use std::num::ParseIntError;

#[derive(Debug, Clone)]
pub enum ByteArrayParseErr {
    EmptySrcArray,
    ParseIntError(ParseIntError),
}

impl From<ParseIntError> for ByteArrayParseErr {
    fn from(e: ParseIntError) -> Self {
        ByteArrayParseErr::ParseIntError(e)
    }
}

impl Display for ByteArrayParseErr {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        let err_msg = match self {
            ByteArrayParseErr::EmptySrcArray => "Provided array is empty!".to_string(),
            ByteArrayParseErr::ParseIntError(e) => format!("Failed to parse as int: {}", e),
        };

        write!(f, "{}", err_msg)
    }
}

fn bytes_from_str_array(src: Vec<String>) -> Result<Vec<u8>, ByteArrayParseErr> {
    src.iter()
        .map(|element| {
            if element.starts_with("0x") || element.starts_with("0X") {
                u8::from_str_radix(&element[2..], 16)
            } else if element.starts_with("0b") || element.starts_with("0B") {
                u8::from_str_radix(&element[2..], 1)
            } else if element.starts_with('h') || element.starts_with('h') {
                u8::from_str_radix(&element[1..], 16)
            } else if let Some(value) = element.strip_prefix('0') {
                u8::from_str_radix(value, 8)
            } else {
                str::parse(element)
            }
        })
        .map(|e| e.map_err(ByteArrayParseErr::from))
        .collect()
}

pub fn parse_bytes_from_input_arg(src: Vec<String>) -> Result<Vec<u8>, ByteArrayParseErr> {
    if src.is_empty() {
        return Err(ByteArrayParseErr::EmptySrcArray);
    }

    let str_arr = if src.len() == 1 {
        src[0]
            .replace(',', " ")
            .replace('[', "")
            .replace(']', "")
            .split_whitespace()
            .map(|s| s.to_string())
            .collect()
    } else {
        src
    };

    bytes_from_str_array(str_arr)
}