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use crate::prelude::*;
use crate::Method;

use std::sync::Arc;
use std::str::FromStr;
use async_trait::async_trait;

use super::ALPHABET;

#[derive(Clone, Debug, PartialEq, Default)]
#[cfg_attr(featue = "serde", derive(serde::Deserialize, serde::Serialize))]
pub struct Xor;

impl FromStr for Xor {
    type Err = Error;

    fn from_str(input: &str) -> Result<Self> {
        if input.to_uppercase() == "XOR" {
            Ok(Xor)
        } else {
            Err(Error::InvalidMethodError(input.to_string()))
        }
    }
}

#[async_trait]
impl Method for Xor {
    async fn encrypt(&self, uw: Arc<str>, vw: Arc<str>) -> Result<String> {
        let mut binary_vw_word = String::new();
        let mut binary_uw_word = String::new();
        let mut new_pass = String::new();

        for i in vw.bytes() {
            binary_vw_word.push_str(&format!("0{:b}", i));
        }
        for i in uw.bytes() {
            binary_uw_word.push_str(&format!("0{:b}", i));
        }

        let mut x = 0;
        let mut binary_pass = String::new();
        for i in 0..binary_uw_word.len() {
            if x == 8 {
                binary_pass += " ";
                x = 0
            }
            let uw_val = &(binary_uw_word.as_bytes()[{
                if i > binary_uw_word.len() - 1 {
                    i - (binary_uw_word.len() * (i / binary_uw_word.len()))
                } else {
                    i
                }
            }] as char)
                .to_string()
                .parse::<u8>()
                .unwrap();
            let vw_val = &(binary_vw_word.as_bytes()[i] as char)
                .to_string()
                .parse()
                .unwrap();
            binary_pass.push_str(&format!("{:b}", uw_val ^ vw_val));
            x += 1;
        }

        let binary_vec: Vec<&str> = binary_pass.split(' ').collect();
        for i in binary_vec {
            let number = usize::from_str_radix(i, 2).unwrap();
            let val = match ALPHABET.get(number) {
                Some(v) => v,
                None => continue,
            };
            new_pass.push(*val);
        }

        Ok(new_pass)
    }
}