o402 0.1.2

OpenAI-compatible gateway, paid with x402.
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//! tvm exact accepts.

use r402_protocol::network::ChainId;
use r402_protocol::payment::PriceTag;

#[cfg(not(feature = "tvm"))]
use super::feature_missing;
#[cfg(feature = "tvm")]
use super::{
    accept_custom_decimals, custom_asset_address, invalid_asset_address, invalid_network,
    invalid_pay_to, named_ticker, no_deployment, reject_evm_fields, require_exact,
};
use crate::config::{AcceptConfig, ConfigError};

#[cfg(not(feature = "tvm"))]
pub(super) fn build(
    _accept: &AcceptConfig,
    _network: &ChainId,
    _amount: u128,
    _pay_to: &str,
) -> Result<PriceTag, ConfigError> {
    Err(feature_missing("tvm", "tvm"))
}

#[cfg(not(feature = "tvm"))]
pub(super) fn decimals(_accept: &AcceptConfig, _network: &ChainId) -> Result<u8, ConfigError> {
    Err(feature_missing("tvm", "tvm"))
}

#[cfg(feature = "tvm")]
pub(super) fn decimals(accept: &AcceptConfig, network: &ChainId) -> Result<u8, ConfigError> {
    Ok(token(accept, network)?.decimals)
}

#[cfg(feature = "tvm")]
pub(super) fn build(
    accept: &AcceptConfig,
    network: &ChainId,
    amount: u128,
    pay_to: &str,
) -> Result<PriceTag, ConfigError> {
    use std::str::FromStr as _;

    use r402_tvm::TvmExact;
    use r402_tvm::chain::TvmAddress;

    require_exact(accept)?;
    reject_evm_fields(accept, "tvm")?;
    let pay_to =
        TvmAddress::from_str(pay_to).map_err(|error| invalid_pay_to("TVM", pay_to, error))?;
    let token = token(accept, network)?;
    Ok(TvmExact::price_tag(pay_to, token.amount(amount)))
}

#[cfg(feature = "tvm")]
fn token(
    accept: &AcceptConfig,
    network: &ChainId,
) -> Result<r402_tvm::chain::TvmTokenDeployment, ConfigError> {
    use std::str::FromStr as _;

    use r402_tvm::USDT;
    use r402_tvm::chain::{TvmAddress, TvmChainReference, TvmTokenDeployment};

    let chain = TvmChainReference::try_from(network.clone())
        .map_err(|error| invalid_network("tvm", &accept.network, error))?;
    if named_ticker(accept, &["usdt"])?.is_some() {
        return USDT::on(chain)
            .cloned()
            .ok_or_else(|| no_deployment("USDT", &accept.network));
    }
    let address = custom_asset_address(accept)?;
    let address =
        TvmAddress::from_str(address).map_err(|error| invalid_asset_address(address, error))?;
    Ok(TvmTokenDeployment::new(
        chain,
        address,
        accept_custom_decimals(accept)?,
    ))
}