pub mod app;
pub mod general;
pub mod types;
pub mod vm;

use crate::constants::ADMIN_ACCOUNTS;
use detee_shared::common_proto::{Empty, Pubkey};
use detee_shared::general_proto::{
    AirdropReq, BanUserReq, KickReq, RegOperatorReq, ReportNodeReq, SlashReq,
};
use detee_shared::vm_proto::{ListVmContractsReq, *};
use tonic::{Request, Status};

pub trait PubkeyGetter {
    fn get_pubkey(&self) -> Option<String>;
}

macro_rules! impl_pubkey_getter {
    ($t:ty, $field:ident) => {
        impl PubkeyGetter for $t {
            fn get_pubkey(&self) -> Option<String> {
                Some(self.$field.clone())
            }
        }
    };
    ($t:ty) => {
        impl PubkeyGetter for $t {
            fn get_pubkey(&self) -> Option<String> {
                None
            }
        }
    };
}

impl_pubkey_getter!(Pubkey, pubkey);
impl_pubkey_getter!(NewVmReq, admin_pubkey);
impl_pubkey_getter!(DeleteVmReq, admin_pubkey);
impl_pubkey_getter!(UpdateVmReq, admin_pubkey);
impl_pubkey_getter!(ExtendVmReq, admin_pubkey);
impl_pubkey_getter!(ReportNodeReq, admin_pubkey);
impl_pubkey_getter!(ListVmContractsReq, wallet);
impl_pubkey_getter!(RegisterVmNodeReq, node_pubkey);
impl_pubkey_getter!(RegOperatorReq, pubkey);
impl_pubkey_getter!(KickReq, operator_wallet);
impl_pubkey_getter!(BanUserReq, operator_wallet);

impl_pubkey_getter!(VmNodeFilters);
impl_pubkey_getter!(Empty);
impl_pubkey_getter!(AirdropReq);
impl_pubkey_getter!(SlashReq);

// impl_pubkey_getter!(NewAppReq, admin_pubkey);
// impl_pubkey_getter!(DelAppReq, admin_pubkey);
// impl_pubkey_getter!(ListAppContractsReq, admin_pubkey);
//
// impl_pubkey_getter!(RegisterAppNodeReq);
// impl_pubkey_getter!(AppNodeFilters);

pub fn check_sig_from_req<T: std::fmt::Debug + PubkeyGetter>(req: Request<T>) -> Result<T, Status> {
    let time = match req.metadata().get("timestamp") {
        Some(t) => t.clone(),
        None => return Err(Status::unauthenticated("Timestamp not found in metadata.")),
    };
    let time = time
        .to_str()
        .map_err(|_| Status::unauthenticated("Timestamp in metadata is not a string"))?;

    let now = chrono::Utc::now();
    let parsed_time = chrono::DateTime::parse_from_rfc3339(time)
        .map_err(|_| Status::unauthenticated("Coult not parse timestamp"))?;
    let seconds_elapsed = now.signed_duration_since(parsed_time).num_seconds();
    if !(-4..=4).contains(&seconds_elapsed) {
        return Err(Status::unauthenticated(format!(
            "Date is not within 4 sec of the time of the server: CLI {} vs Server {}",
            parsed_time, now
        )));
    }

    let signature = match req.metadata().get("request-signature") {
        Some(t) => t,
        None => return Err(Status::unauthenticated("signature not found in metadata.")),
    };
    let signature = bs58::decode(signature)
        .into_vec()
        .map_err(|_| Status::unauthenticated("signature is not a bs58 string"))?;
    let signature = ed25519_dalek::Signature::from_bytes(
        signature
            .as_slice()
            .try_into()
            .map_err(|_| Status::unauthenticated("could not parse ed25519 signature"))?,
    );

    let pubkey_value = match req.metadata().get("pubkey") {
        Some(p) => p.clone(),
        None => return Err(Status::unauthenticated("pubkey not found in metadata.")),
    };
    let pubkey = ed25519_dalek::VerifyingKey::from_bytes(
        &bs58::decode(&pubkey_value)
            .into_vec()
            .map_err(|_| Status::unauthenticated("pubkey is not a bs58 string"))?
            .try_into()
            .map_err(|_| Status::unauthenticated("pubkey does not have the correct size."))?,
    )
    .map_err(|_| Status::unauthenticated("could not parse ed25519 pubkey"))?;

    let req = req.into_inner();
    let message = format!("{time}{req:?}");
    use ed25519_dalek::Verifier;
    pubkey
        .verify(message.as_bytes(), &signature)
        .map_err(|_| Status::unauthenticated("the signature is not valid"))?;
    if let Some(req_pubkey) = req.get_pubkey() {
        if *pubkey_value.to_str().unwrap() != req_pubkey {
            return Err(Status::unauthenticated(
                "pubkey of signature does not match pubkey of request",
            ));
        }
    }
    Ok(req)
}

pub fn check_sig_from_parts(pubkey: &str, time: &str, msg: &str, sig: &str) -> Result<(), Status> {
    let now = chrono::Utc::now();
    let parsed_time = chrono::DateTime::parse_from_rfc3339(time)
        .map_err(|_| Status::unauthenticated("Coult not parse timestamp"))?;
    let seconds_elapsed = now.signed_duration_since(parsed_time).num_seconds();
    if !(-4..=4).contains(&seconds_elapsed) {
        return Err(Status::unauthenticated(format!(
            "Date is not within 4 sec of the time of the server: CLI {} vs Server {}",
            parsed_time, now
        )));
    }

    let signature = bs58::decode(sig)
        .into_vec()
        .map_err(|_| Status::unauthenticated("signature is not a bs58 string"))?;
    let signature = ed25519_dalek::Signature::from_bytes(
        signature
            .as_slice()
            .try_into()
            .map_err(|_| Status::unauthenticated("could not parse ed25519 signature"))?,
    );

    let pubkey = ed25519_dalek::VerifyingKey::from_bytes(
        &bs58::decode(&pubkey)
            .into_vec()
            .map_err(|_| Status::unauthenticated("pubkey is not a bs58 string"))?
            .try_into()
            .map_err(|_| Status::unauthenticated("pubkey does not have the correct size."))?,
    )
    .map_err(|_| Status::unauthenticated("could not parse ed25519 pubkey"))?;

    let msg = time.to_string() + msg;
    use ed25519_dalek::Verifier;
    pubkey
        .verify(msg.as_bytes(), &signature)
        .map_err(|_| Status::unauthenticated("the signature is not valid"))?;

    Ok(())
}

pub fn check_admin_key<T>(req: &Request<T>) -> Result<(), Status> {
    let pubkey = match req.metadata().get("pubkey") {
        Some(p) => p.clone(),
        None => return Err(Status::unauthenticated("pubkey not found in metadata.")),
    };
    let pubkey = pubkey
        .to_str()
        .map_err(|_| Status::unauthenticated("could not parse pubkey metadata to str"))?;

    if !ADMIN_ACCOUNTS.contains(&pubkey) {
        return Err(Status::unauthenticated("This operation is reserved to admin accounts"));
    }

    Ok(())
}