sdk_relay/src/commit.rs

use std::{
    collections::HashMap,
    sync::{Mutex, MutexGuard, OnceLock},
};

use anyhow::{Error, Result};

use bitcoincore_rpc::bitcoin::hex::DisplayHex;
use sdk_common::network::{AnkFlag, CommitMessage, HandshakeMessage};
use sdk_common::process::{lock_processes, Process, ProcessState};
use sdk_common::serialization::{OutPointMemberMap, OutPointProcessMap};
use sdk_common::silentpayments::create_transaction;
use sdk_common::sp_client::bitcoin::{Amount, OutPoint};
use sdk_common::sp_client::{FeeRate, Recipient};
use sdk_common::{
    pcd::Member,
    silentpayments::sign_transaction,
    sp_client::{silentpayments::SilentPaymentAddress, RecipientAddress},
};

use crate::{lock_freezed_utxos, MutexExt, DAEMON, STORAGE, WALLET};
use crate::{
    message::{broadcast_message, BroadcastType},
    CHAIN_TIP,
};

pub(crate) fn handle_commit_request(commit_msg: CommitMessage) -> Result<OutPoint> {
    let mut processes = lock_processes()?;
    if let Some(process) = processes.get_mut(&commit_msg.process_id) {
        handle_existing_commitment(process, &commit_msg)?;
    } else {
        let new_process = handle_new_process(&commit_msg)?;
        // Cache the process
        processes.insert(commit_msg.process_id, new_process);
    }

    // Dump to disk
    dump_cached_processes(processes.clone())?;

    // Add to frozen UTXOs
    lock_freezed_utxos()?.insert(commit_msg.process_id);

    // Send an update to all connected clients if wallet is available
    if let Some(wallet_lock) = WALLET.get() {
        let our_sp_address = wallet_lock
            .lock_anyhow()?
            .get_sp_client()
            .get_receiving_address();
        let mut new_process_map = HashMap::new();
        let new_process = processes.get(&commit_msg.process_id).unwrap().clone();
        new_process_map.insert(commit_msg.process_id, new_process);
        let current_tip = CHAIN_TIP.load(std::sync::atomic::Ordering::SeqCst);
        let init_msg = HandshakeMessage::new(
            our_sp_address.to_string(),
            OutPointMemberMap(HashMap::new()),
            OutPointProcessMap(new_process_map),
            current_tip.into(),
        );

        if let Err(e) = broadcast_message(
            AnkFlag::Handshake,
            format!("{}", init_msg.to_string()),
            BroadcastType::ToAll,
        ) {
            log::error!("Failed to send handshake message: {}", e);
        }
    } else {
        log::debug!("WALLET not initialized: skipping initial handshake broadcast");
    }

    Ok(commit_msg.process_id)
}

fn send_members_update(pairing_process_id: OutPoint) -> Result<()> {
    dump_cached_members()?;
    // Broadcast members update if wallet is available
    if let Some(wallet_lock) = WALLET.get() {
        if let Some(new_member) = lock_members().unwrap().get(&pairing_process_id) {
            let our_sp_address = wallet_lock
                .lock_anyhow()?
                .get_sp_client()
                .get_receiving_address();
            let mut new_member_map = HashMap::new();
            new_member_map.insert(pairing_process_id, new_member.clone());
            let init_msg = HandshakeMessage::new(
                our_sp_address.into(),
                OutPointMemberMap(new_member_map),
                OutPointProcessMap(HashMap::new()),
                CHAIN_TIP.load(std::sync::atomic::Ordering::SeqCst).into(),
            );

            if let Err(e) = broadcast_message(
                AnkFlag::Handshake,
                format!("{}", init_msg.to_string()),
                BroadcastType::ToAll,
            ) {
                log::warn!("Failed to send handshake message: {}", e);
            }

            Ok(())
        } else {
            Err(Error::msg(format!(
                "Failed to find new member with process id {}",
                pairing_process_id
            )))
        }
    } else {
        log::debug!("WALLET not initialized: skipping members update broadcast");
        Ok(())
    }
}

fn handle_new_process(commit_msg: &CommitMessage) -> Result<Process> {
    let pcd_commitment = &commit_msg.pcd_commitment;

    let merkle_root_bin = pcd_commitment.create_merkle_tree()?.root().unwrap();

    if let Ok(pairing_process_id) = handle_member_list(&commit_msg) {
        send_members_update(pairing_process_id)?;
    }

    let mut new_process = Process::new(commit_msg.process_id);
    let init_state = ProcessState {
        commited_in: commit_msg.process_id,
        roles: commit_msg.roles.clone(),
        pcd_commitment: commit_msg.pcd_commitment.clone(),
        state_id: merkle_root_bin,
        public_data: commit_msg.public_data.clone(),
        ..Default::default()
    };

    new_process.insert_concurrent_state(init_state)?;

    Ok(new_process)
}

pub static MEMBERLIST: OnceLock<Mutex<HashMap<OutPoint, Member>>> = OnceLock::new();

pub fn lock_members() -> Result<MutexGuard<'static, HashMap<OutPoint, Member>>, anyhow::Error> {
    MEMBERLIST
        .get_or_init(|| Mutex::new(HashMap::new()))
        .lock_anyhow()
}

fn handle_member_list(commit_msg: &CommitMessage) -> Result<OutPoint> {
    //Check if there is one role with one member
    if commit_msg.roles.len() != 1 {
        return Err(Error::msg("Process is not a pairing process"));
    }

    if let Some(pairing_role) = commit_msg.roles.get("pairing") {
        if !pairing_role.members.is_empty() {
            return Err(Error::msg("Process is not a pairing process"));
        }
    } else {
        return Err(Error::msg("Process is not a pairing process"));
    }

    if let Ok(paired_addresses) = commit_msg.public_data.get_as_json("pairedAddresses") {
        let paired_addresses: Vec<SilentPaymentAddress> =
            serde_json::from_value(paired_addresses.clone())?;
        let mut memberlist = lock_members()?;
        memberlist.insert(commit_msg.process_id, Member::new(paired_addresses));
        return Ok(commit_msg.process_id);
    }

    Err(Error::msg("Process is not a pairing process"))
}

fn handle_existing_commitment(
    process_to_udpate: &mut Process,
    commit_msg: &CommitMessage,
) -> Result<()> {
    let process_id = process_to_udpate.get_process_id()?;
    match register_new_state(process_to_udpate, &commit_msg) {
        Ok(new_state_id) => log::debug!(
            "Registering new state for process {} with state id {}",
            process_id,
            new_state_id.to_lower_hex_string()
        ),
        Err(existing_state_id) => log::debug!("State {} already exists", existing_state_id),
    }

    if commit_msg.validation_tokens.len() > 0 {
        log::debug!(
            "Received commit_msg with {} validation tokens for process {}",
            commit_msg.validation_tokens.len(),
            process_id
        );
        // If the validation succeed, we return a new tip
        process_validation(process_to_udpate, commit_msg)?;

        if let Ok(pairing_process_id) = handle_member_list(commit_msg) {
            debug_assert_eq!(pairing_process_id, process_id);
            send_members_update(process_id)?;
        }
    }

    Ok(())
}

pub fn dump_cached_members() -> Result<(), anyhow::Error> {
    let members = lock_members()?.clone();

    let storage = STORAGE
        .get()
        .ok_or(Error::msg("STORAGE is not initialized"))?
        .lock_anyhow()?;

    let members_file = &storage.members_file;

    let members_map = OutPointMemberMap(members);
    let json = serde_json::to_value(&members_map)?;
    members_file.save(&json)?;

    log::debug!("saved members");

    Ok(())
}

pub fn dump_cached_processes(processes: HashMap<OutPoint, Process>) -> Result<(), anyhow::Error> {
    let storage = STORAGE
        .get()
        .ok_or(Error::msg("STORAGE is not initialized"))?
        .lock_anyhow()?;

    let processes_file = &storage.processes_file;

    let outpoints_map = OutPointProcessMap(processes);
    let json = serde_json::to_value(&outpoints_map)?;
    processes_file.save(&json)?;

    log::debug!("saved processes");

    Ok(())
}

// Register a new state
fn register_new_state(process: &mut Process, commit_msg: &CommitMessage) -> Result<[u8; 32]> {
    let last_commited_state = process.get_latest_commited_state();

    let new_state_id = commit_msg
        .pcd_commitment
        .create_merkle_tree()?
        .root()
        .unwrap();

    if let Some(state) = last_commited_state {
        if new_state_id == state.state_id {
            return Err(Error::msg(format!(
                "{}",
                new_state_id.to_lower_hex_string()
            )));
        }
    }

    let concurrent_states = process.get_latest_concurrent_states()?;
    let (empty_state, actual_states) = concurrent_states.split_last().unwrap();
    let current_outpoint = empty_state.commited_in;

    // Ensure no duplicate states
    if actual_states
        .iter()
        .any(|state| state.state_id == new_state_id)
    {
        return Err(Error::msg(format!(
            "{}",
            new_state_id.to_lower_hex_string()
        )));
    }

    // Add the new state
    let new_state = ProcessState {
        commited_in: current_outpoint,
        pcd_commitment: commit_msg.pcd_commitment.clone(),
        state_id: new_state_id.clone(),
        roles: commit_msg.roles.clone(),
        public_data: commit_msg.public_data.clone(),
        ..Default::default()
    };
    process.insert_concurrent_state(new_state)?;

    Ok(new_state_id)
}

// Process validation for a state with validation tokens
fn process_validation(
    updated_process: &mut Process,
    commit_msg: &CommitMessage,
) -> Result<OutPoint> {
    let new_state_id = if commit_msg.pcd_commitment.is_empty() {
        // We're dealing with an obliteration attempt
        [0u8; 32]
    } else {
        commit_msg
            .pcd_commitment
            .create_merkle_tree()?
            .root()
            .ok_or(Error::msg("Invalid merkle tree"))?
    };

    {
        let state_to_update = updated_process.get_state_for_id_mut(&new_state_id)?;

        // Complete with the received tokens
        state_to_update
            .validation_tokens
            .extend(commit_msg.validation_tokens.iter());

        state_to_update.validation_tokens.sort_unstable();
        state_to_update.validation_tokens.dedup();
    }

    let state_to_validate = updated_process.get_state_for_id(&new_state_id)?;
    let members = lock_members()?.clone();
    state_to_validate.is_valid(
        updated_process.get_latest_commited_state(),
        &OutPointMemberMap(members),
    )?;

    let commited_in = commit_new_transaction(updated_process, state_to_validate.clone())?;

    Ok(commited_in)
}

// Commit the new transaction and update the process state
fn commit_new_transaction(
    updated_process: &mut Process,
    state_to_commit: ProcessState,
) -> Result<OutPoint> {
    let sp_wallet = WALLET
        .get()
        .ok_or(Error::msg("Wallet not initialized"))?
        .lock_anyhow()?;

    let commitment_payload = Vec::from(state_to_commit.state_id);

    let mut recipients = vec![];
    recipients.push(Recipient {
        address: RecipientAddress::SpAddress(sp_wallet.get_sp_client().get_receiving_address()),
        amount: Amount::from_sat(1000),
    });

    // TODO not sure if this is still used
    // If the process is a pairing, we add another output that directly pays the owner of the process
    // We can find out simply by looking at the members list
    if let Some(member) = lock_members()?.get(&updated_process.get_process_id().unwrap()) {
        // We just pick one of the devices of the member at random en pay to it, member can then share the private key between all devices
        // For now we take the first address
        let address: SilentPaymentAddress =
            member.get_addresses().get(0).unwrap().as_str().try_into()?;
        recipients.push(Recipient {
            address: RecipientAddress::SpAddress(address),
            amount: Amount::from_sat(1000),
        });
    }
    // This output is used to generate publicly available public keys without having to go through too many loops

    let daemon = DAEMON.get().unwrap().lock_anyhow()?;
    let fee_rate = daemon
        .estimate_fee(6)
        .unwrap_or(Amount::from_sat(1000))
        .checked_div(1000)
        .unwrap();

    let mut freezed_utxos = lock_freezed_utxos()?;

    let next_commited_in = updated_process.get_process_tip()?;
    if !freezed_utxos.contains(&next_commited_in) {
        return Err(Error::msg(format!(
            "Missing next commitment outpoint for process {}",
            updated_process.get_process_id()?
        )));
    };

    let unspent_outputs = sp_wallet.get_unspent_outputs();
    let mut available_outpoints = vec![];
    // We push the next_commited_in at the top of the available outpoints
    if let Some(output) = unspent_outputs.get(&next_commited_in) {
        available_outpoints.push((next_commited_in, output.clone()));
    }

    // We filter out freezed utxos
    for (outpoint, output) in unspent_outputs {
        if !freezed_utxos.contains(&outpoint) {
            available_outpoints.push((outpoint, output));
        }
    }

    let unsigned_transaction = create_transaction(
        available_outpoints,
        sp_wallet.get_sp_client(),
        recipients,
        Some(commitment_payload),
        FeeRate::from_sat_per_vb(fee_rate.to_sat() as f32),
    )?;

    let final_tx = sign_transaction(sp_wallet.get_sp_client(), unsigned_transaction)?;

    daemon.test_mempool_accept(&final_tx)?;
    let txid = daemon.broadcast(&final_tx)?;
    let commited_in = OutPoint::new(txid, 0);

    freezed_utxos.insert(commited_in);
    freezed_utxos.remove(&next_commited_in);
    updated_process.remove_all_concurrent_states()?;
    updated_process.insert_concurrent_state(state_to_commit)?;
    updated_process.update_states_tip(commited_in)?;

    Ok(commited_in)
}

// TODO tests are broken, we need a complete overhaul to make it work again
#[cfg(test)]
mod tests {
    use super::*;

    use crate::daemon::RpcCall;
    use crate::DiskStorage;
    use crate::StateFile;
    use bitcoincore_rpc::bitcoin::consensus::deserialize;
    use bitcoincore_rpc::bitcoin::hex::DisplayHex;
    use bitcoincore_rpc::bitcoin::*;
    use mockall::mock;
    use mockall::predicate::*;
    use sdk_common::pcd::Member;
    use sdk_common::pcd::Pcd;
    use sdk_common::pcd::PcdCommitments;
    use sdk_common::pcd::RoleDefinition;
    use sdk_common::pcd::Roles;
    use sdk_common::pcd::ValidationRule;
    use sdk_common::process::CACHEDPROCESSES;
    use sdk_common::sp_client::bitcoin::consensus::serialize;
    use sdk_common::sp_client::bitcoin::hex::FromHex;
    use sdk_common::sp_client::silentpayments::SilentPaymentAddress;
    use serde_json::json;
    use serde_json::{Map, Value};
    use std::collections::BTreeMap;
    use std::collections::HashMap;
    use std::path::PathBuf;
    use std::str::FromStr;
    use std::sync::Mutex;
    use std::sync::OnceLock;
    use std::sync::Once;

    const LOCAL_ADDRESS: &str = "sprt1qq222dhaxlzmjft2pa7qtspw2aw55vwfmtnjyllv5qrsqwm3nufxs6q7t88jf9asvd7rxhczt87de68du3jhem54xvqxy80wc6ep7lauxacsrq79v";
    const INIT_TRANSACTION: &str = "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";
    const TMP_WALLET: &str = "/tmp/.4nk/wallet";
    const TMP_PROCESSES: &str = "/tmp/.4nk/processes";
    const TMP_MEMBERS: &str = "/tmp/.4nk/members";

    static INIT_ONCE: Once = Once::new();

    // Define the mock for Daemon with the required methods
    mock! {
        #[derive(Debug)]
        pub Daemon {}

        impl RpcCall for Daemon {
            fn connect(
                rpcwallet: Option<String>,
                rpc_url: String,
                network: bitcoincore_rpc::bitcoin::Network,
                cookie_path: Option<PathBuf>,
            ) -> Result<Self> where Self: Sized;

            fn estimate_fee(&self, nblocks: u16) -> Result<Amount>;

            fn get_relay_fee(&self) -> Result<Amount>;

            fn get_current_height(&self) -> Result<u64>;

            fn get_block(&self, block_hash: BlockHash) -> Result<Block>;

            fn get_filters(&self, block_height: u32) -> Result<(u32, BlockHash, bip158::BlockFilter)>;

            fn list_unspent_from_to(
                &self,
                minamt: Option<Amount>,
            ) -> Result<Vec<bitcoincore_rpc::json::ListUnspentResultEntry>>;

            fn create_psbt(
                &self,
                unspents: &[bitcoincore_rpc::json::ListUnspentResultEntry],
                spk: ScriptBuf,
                network: Network,
            ) -> Result<String>;

            fn process_psbt(&self, psbt: String) -> Result<String>;
            fn finalize_psbt(&self, psbt: String) -> Result<String>;
            fn get_network(&self) -> Result<Network>;
            fn test_mempool_accept(&self, tx: &Transaction) -> Result<crate::bitcoin_json::TestMempoolAcceptResult>;
            fn broadcast(&self, tx: &Transaction) -> Result<Txid>;
            fn get_transaction_info(&self, txid: &Txid, blockhash: Option<BlockHash>) -> Result<Value>;
            fn get_transaction_hex(&self, txid: &Txid, blockhash: Option<BlockHash>) -> Result<Value>;
            fn get_transaction(&self, txid: &Txid, blockhash: Option<BlockHash>) -> Result<Transaction>;
            fn get_block_txids(&self, blockhash: BlockHash) -> Result<Vec<Txid>>;
            fn get_mempool_txids(&self) -> Result<Vec<Txid>>;
            fn get_mempool_entries(&self, txids: &[Txid]) -> Result<Vec<Result<bitcoincore_rpc::json::GetMempoolEntryResult>>>;
            fn get_mempool_transactions(&self, txids: &[Txid]) -> Result<Vec<Result<Transaction>>>;
                }
    }

    mock! {
        #[derive(Debug)]
        pub SpWallet {
            fn get_receiving_address(&self) -> Result<String>;
        }
    }

    mock! {
        #[derive(Debug)]
        pub SilentPaymentWallet {
            fn get_sp_wallet(&self) -> Result<MockSpWallet>;
        }
    }

    static WALLET: OnceLock<MockSilentPaymentWallet> = OnceLock::new();

    pub fn initialize_static_variables() {
        INIT_ONCE.call_once(|| {
            if DAEMON.get().is_none() {
                let mut daemon = MockDaemon::new();
                daemon
                    .expect_broadcast()
                    .withf(|tx: &Transaction| serialize(tx).to_lower_hex_string() == INIT_TRANSACTION)
                    .returning(|tx| Ok(tx.txid()));
                DAEMON
                    .set(Mutex::new(Box::new(daemon)))
                    .expect("DAEMON should only be initialized once");
                println!("Initialized DAEMON");
            }

            if WALLET.get().is_none() {
                let mut wallet = MockSilentPaymentWallet::new();
                wallet
                    .expect_get_sp_wallet()
                    .returning(|| Ok(MockSpWallet::new()));
                WALLET
                    .set(wallet)
                    .expect("WALLET should only be initialized once");
                println!("Initialized WALLET");
            }

            if CACHEDPROCESSES.get().is_none() {
                CACHEDPROCESSES
                    .set(Mutex::new(HashMap::new()))
                    .expect("CACHEDPROCESSES should only be initialized once");

                println!("Initialized CACHEDPROCESSES");
            }

            if STORAGE.get().is_none() {
                // Respect parent ".4nk" constraint: unique filenames under /tmp/.4nk
                let base_dir = PathBuf::from("/tmp/.4nk");
                if let Err(e) = std::fs::create_dir_all(&base_dir) {
                    eprintln!("Failed to create base test storage dir {:?}: {}", base_dir, e);
                }
                let uid = uuid::Uuid::new_v4();
                let wallet_path = base_dir.join(format!("wallet_{}", uid));
                let processes_path = base_dir.join(format!("processes_{}", uid));
                let members_path = base_dir.join(format!("members_{}", uid));

                let wallet_file = StateFile::new(wallet_path);
                let processes_file = StateFile::new(processes_path);
                let members_file = StateFile::new(members_path);

                wallet_file.create().unwrap();
                processes_file.create().unwrap();
                members_file.create().unwrap();

                let disk_storage = DiskStorage {
                    wallet_file,
                    processes_file,
                    members_file,
                };
                STORAGE
                    .set(Mutex::new(disk_storage))
                    .expect("STORAGE should initialize only once");

                println!("Initialized STORAGE");
            }
        });
    }

    fn mock_commit_msg(process_id: OutPoint) -> CommitMessage {
        let field_names = [
            "a".to_owned(),
            "b".to_owned(),
            "pub_a".to_owned(),
            "roles".to_owned(),
        ];
        let pairing_id = OutPoint::from_str(
            "b0c8378ee68e9a73836b04423ddb6de9fc0e2e715e04ffe6aa34117bb1025f01:0",
        )
        .unwrap();
        let member = Member::new(vec![SilentPaymentAddress::try_from(LOCAL_ADDRESS).unwrap()]);
        let validation_rule = ValidationRule::new(1.0, Vec::from(field_names), 1.0).unwrap();

        let role_def = RoleDefinition {
            members: vec![pairing_id],
            validation_rules: vec![validation_rule],
            storages: vec![],
        };
        let roles = Roles::new(BTreeMap::from([(String::from("role_name"), role_def)]));
        let public_data = TryInto::<Pcd>::try_into(json!({"pub_a": Value::Null})).unwrap();
        let clear_state =
            TryInto::<Pcd>::try_into(json!({"a": Value::Null, "b": Value::Null})).unwrap();
        let pcd_commitments = PcdCommitments::new(
            &process_id,
            &Pcd::new(public_data.clone().into_iter().chain(clear_state).collect()),
            &roles,
        )
        .unwrap();

        let commit_msg = CommitMessage {
            process_id,
            roles,
            public_data,
            validation_tokens: vec![],
            pcd_commitment: pcd_commitments,
            error: None,
        };

        commit_msg
    }

    #[test]
    fn test_handle_commit_new_process() {
        initialize_static_variables();
        let init_tx =
            deserialize::<Transaction>(&Vec::from_hex(INIT_TRANSACTION).unwrap()).unwrap();
        let init_txid = init_tx.txid();
        let process_id = OutPoint::new(init_txid, 0);

        let commit_msg = mock_commit_msg(process_id);

        let roles = commit_msg.roles.clone();
        let pcd_commitment = commit_msg.pcd_commitment.clone();

        let empty_state = ProcessState {
            commited_in: process_id,
            ..Default::default()
        };

        let result = handle_commit_request(commit_msg);

        assert_eq!(result.unwrap(), process_id);

        let cache = CACHEDPROCESSES.get().unwrap().lock().unwrap();
        let updated_process = cache.get(&process_id);

        assert!(updated_process.is_some());
        let concurrent_states = updated_process
            .unwrap()
            .get_latest_concurrent_states()
            .unwrap();

        assert!(concurrent_states.len() >= 2);
        let first = &concurrent_states[0];
        let second = &concurrent_states[concurrent_states.len() - 1];

        assert_eq!(first.commited_in, process_id);
        assert_eq!(first.state_id, [0u8; 32]);

        assert_eq!(second.commited_in, process_id);
        assert!(!second.pcd_commitment.is_empty());
        assert_ne!(second.state_id, [0u8; 32]);
    }

    #[test]
    fn test_handle_commit_new_state() {
        initialize_static_variables();
        let init_tx =
            deserialize::<Transaction>(&Vec::from_hex(INIT_TRANSACTION).unwrap()).unwrap();
        let init_txid = init_tx.txid();
        let process_id = OutPoint::new(init_txid, 0);

        let commit_msg = mock_commit_msg(process_id);

        let roles = commit_msg.roles.clone();
        let pcd_commitment = commit_msg.pcd_commitment.clone();

        let process = Process::new(process_id);
        CACHEDPROCESSES
            .get()
            .unwrap()
            .lock()
            .unwrap()
            .insert(process_id, process);

        let result = handle_commit_request(commit_msg);

        assert_eq!(result.unwrap(), process_id);

        let cache = CACHEDPROCESSES.get().unwrap().lock().unwrap();
        let updated_process = cache.get(&process_id);

        assert!(updated_process.is_some());
        let concurrent_states = updated_process
            .unwrap()
            .get_latest_concurrent_states()
            .unwrap();

        assert!(concurrent_states.len() >= 2);
        let first = &concurrent_states[0];
        let second = &concurrent_states[concurrent_states.len() - 1];

        assert_eq!(first.commited_in, process_id);
        assert_eq!(first.state_id, [0u8; 32]);

        assert_eq!(second.commited_in, process_id);
        assert!(!second.pcd_commitment.is_empty());
        assert_ne!(second.state_id, [0u8; 32]);
    }
}