use base64::{engine::general_purpose, Engine as _};
use dmzj_proto::comic;
use protobuf::Message;
use rsa::{pkcs8::DecodePrivateKey, Pkcs1v15Encrypt, RsaPrivateKey};

const PRIVATE_KEY_STR: &'static str = "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";

const MAX_DECRYPT_BLOCK: usize = 128;

fn get_private_key() -> RsaPrivateKey {
    let key_bytes = general_purpose::STANDARD.decode(PRIVATE_KEY_STR).unwrap();

    let key = RsaPrivateKey::from_pkcs8_der(&key_bytes).unwrap();

    key
}

fn decrypt(encrypted: String, key: RsaPrivateKey) -> Vec<u8> {
    let mut result = vec![];
    let encrypted_data = general_purpose::STANDARD.decode(encrypted).unwrap();

    for chunk in encrypted_data.chunks(MAX_DECRYPT_BLOCK) {
        let dec = key.decrypt(Pkcs1v15Encrypt, chunk).unwrap();
        result.extend_from_slice(&dec);
    }

    result
}

#[tokio::main]
async fn main() {
    let res =
        reqwest::get("https://nnv4api.dmzj.com/comic/chapter/71857/146271")
            .await
            .unwrap();

    let text = res.text().await.unwrap();

    let cipher = get_private_key();

    let b = decrypt(text, cipher);

    let r = comic::ComicChapterResponse::parse_from_bytes(&b).unwrap();

    println!("{:?}", r.data);
}