use base64::Engine;
use der_parser::ber::{BerObject, BerObjectContent};
use der_parser::Oid;
use oid_registry::{OidEntry, OidRegistry};
use oid_registry::asn1_rs::oid;

fn main() {
    let b = "MIIB3DCCAWKgAwIBAgIUBmlMvQ8s4PNWa2dFxhZH6gpVEpUwCgYIKoZIzj0EAwIw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";
    let dd = base64::engine::general_purpose::STANDARD.decode(b.replace("\n", "")).unwrap();
    let ber_obj = der_parser::parse_ber(&dd).unwrap().1;

    // println!("{:#?}", ber_obj);

    let oid_reg = build_oid_register();
    print(&oid_reg, 0, &ber_obj);
}

fn print(oid_reg: &OidRegistry, depth: usize, ber_obj: &BerObject) {
    let prefix = "  ".repeat(depth);
    match &ber_obj.content {
        BerObjectContent::EndOfContent => {
            println!("{}END OF CONTENT", prefix);
        }
        BerObjectContent::Boolean(b) => {
            println!("{}BOOLEAN: {}", prefix, b);
        }
        BerObjectContent::Integer(i) => {
            println!("{}INTEGER: {}", prefix, hex::encode(i));
        }
        BerObjectContent::BitString(u, b) => {
            if let Ok(ber_obj) = der_parser::parse_ber(&b.data) {
                println!("{}BIT STRING[{}]", prefix, u);
                print(&oid_reg, depth + 1, &ber_obj.1);
            } else {
                println!("{}BIT STRING[{}] - {}", prefix, u, hex::encode(b.data));
            }
        }
        BerObjectContent::OctetString(s) => {
            if let Ok(ber_obj) = der_parser::parse_ber(s) {
                println!("{}OCTET STRING", prefix);
                print(&oid_reg, depth + 1, &ber_obj.1);
            } else {
                println!("{}OCTET STRING: {}", prefix, hex::encode(s));
            }
        }
        BerObjectContent::Null => {
            println!("{}NULL", prefix);
        }
        BerObjectContent::Enum(e) => {
            println!("{}ENUM: {}", prefix, e);
        }
        BerObjectContent::OID(oid) => {
            println!("{}OID: {}{}", prefix, oid, format_oid(oid_reg, oid));
        }
        BerObjectContent::RelativeOID(oid) => {
            println!("{}RELATIVE OID: {}{}", prefix, oid, format_oid(oid_reg, oid));
        }
        BerObjectContent::NumericString(s) => {
            println!("{}NUMERIC STRING: {}", prefix, s);
        }
        BerObjectContent::VisibleString(s) => {
            println!("{}VISIBLE STRING: {}", prefix, s);
        }
        BerObjectContent::PrintableString(s) => {
            println!("{}PRINTABLE STRING: {}", prefix, s);
        }
        BerObjectContent::IA5String(s) => {
            println!("{}IA5 STRING: {}", prefix, s);
        }
        BerObjectContent::UTF8String(s) => {
            println!("{}UTF8 STRING: {}", prefix, s);
        }
        BerObjectContent::T61String(s) => {
            println!("{}T61 STRING: {}", prefix, s);
        }
        BerObjectContent::VideotexString(s) => {
            println!("{}VIDEOTEX STRING: {}", prefix, s);
        }
        BerObjectContent::BmpString(s) => {
            println!("{}BMP STRING: {}", prefix, s);
        }
        BerObjectContent::UniversalString(s) => {
            println!("{}UNIVERSAL STRING: {}", prefix, hex::encode(s));
        }
        BerObjectContent::GraphicString(s) => {
            println!("{}GRAPHIC STRING: {}", prefix, s);
        }
        BerObjectContent::GeneralString(s) => {
            println!("{}GENERAL STRING: {}", prefix, s);
        }
        BerObjectContent::ObjectDescriptor(d) => {
            println!("{}OBJECT DESCRIPTOR: {}", prefix, d);
        }
        BerObjectContent::Sequence(ber_objects) => {
            println!("{}SEQUENCE {{", prefix);
            for b in ber_objects {
                print(oid_reg, depth + 1, b);
            }
            println!("{}}}", prefix);
        }
        BerObjectContent::Set(ber_objects) => {
            println!("{}SET {{", prefix);
            for b in ber_objects {
                print(oid_reg, depth + 1, b);
            }
            println!("{}}}", prefix);
        }
        BerObjectContent::UTCTime(t) => {
            println!("{}UTC TIME: {}", prefix, t);
        }
        BerObjectContent::GeneralizedTime(t) => {
            println!("{}GENERALIZED TIME: {}", prefix, t);
        }
        BerObjectContent::Optional(o) => {
            println!("{}OPTIONAL {{", prefix);
            match o {
                None => { println!("{} NONE", prefix) }
                Some(o) => {
                    print(oid_reg, depth + 1, o);
                }
            }
            println!("{}}}", prefix);
        }
        BerObjectContent::Tagged(c, t, o) => {
            println!("{}TAGGED class={} tag={} {{", prefix, c, t);
            print(oid_reg, depth + 1, o);
            println!("{}}}", prefix);
        }
        BerObjectContent::Unknown(u) => {
            let tag = u.header.tag().0;
            if let Ok(ber_obj) = der_parser::parse_ber(&u.data) {
                println!("{}[{}]", prefix, tag);
                print(&oid_reg, depth + 1, &ber_obj.1);
            } else {
                println!("{}[{}] {}", prefix, tag, hex::encode(&u.data));
            }
        }
    }
}

fn format_oid(oid_reg: &OidRegistry, oid: &Oid) -> String {
    match oid_reg.get(oid) {
        None => "".to_string(),
        Some(e) => format!(" // {} ({})", e.sn(), e.description())
    }
}

fn build_oid_register() -> OidRegistry<'static> {
    let mut oid_reg = OidRegistry::default()
        .with_pkcs1()
        .with_pkcs7()
        .with_pkcs9()
        .with_pkcs12()
        .with_x509()
        .with_x962()
        .with_kdf()
        .with_ms_spc()
        .with_nist_algs();
    // more OIDs, https://site.hatter.ink/asn1js/oids.js
    oid_reg.insert(oid!(1.2.156.10197.1.301), OidEntry::new("sm2ECC", "China GM Standards Committee"));
    oid_reg
}