o402 0.1.2

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

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

#[cfg(not(feature = "hedera"))]
use super::feature_missing;
#[cfg(feature = "hedera")]
use super::{
    accept_custom_decimals, amount_u64, 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 = "hedera"))]
pub(super) fn build(
    _accept: &AcceptConfig,
    _network: &ChainId,
    _amount: u128,
    _pay_to: &str,
) -> Result<PriceTag, ConfigError> {
    Err(feature_missing("hedera", "hedera"))
}

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

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

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

    use r402_hedera::HederaExact;
    use r402_hedera::chain::HederaAddress;

    require_exact(accept)?;
    reject_evm_fields(accept, "hedera")?;
    let amount = amount_u64(amount, "hedera")?;
    let pay_to =
        HederaAddress::from_str(pay_to).map_err(|error| invalid_pay_to("Hedera", pay_to, error))?;
    let token = token(accept, network)?;
    Ok(HederaExact::price_tag(pay_to, token.amount(amount)))
}

#[cfg(feature = "hedera")]
fn token(
    accept: &AcceptConfig,
    network: &ChainId,
) -> Result<r402_hedera::chain::HederaTokenDeployment, ConfigError> {
    use std::str::FromStr as _;

    use r402_hedera::chain::{HederaAddress, HederaChainReference, HederaTokenDeployment};
    use r402_hedera::{USDC, hbar_deployment};

    let chain = HederaChainReference::try_from(network.clone())
        .map_err(|error| invalid_network("hedera", &accept.network, error))?;
    match named_ticker(accept, &["usdc", "hbar"])? {
        Some("usdc") => USDC::on(chain)
            .cloned()
            .ok_or_else(|| no_deployment("USDC", &accept.network)),
        Some("hbar") => hbar_deployment(chain)
            .cloned()
            .ok_or_else(|| no_deployment("HBAR", &accept.network)),
        Some(other) => Err(ConfigError::Validation(format!(
            "unknown payment.accepts asset '{other}'; use asset = \"usdc\" or \"hbar\""
        ))),
        None => {
            let address = custom_asset_address(accept)?;
            let address = HederaAddress::from_str(address)
                .map_err(|error| invalid_asset_address(address, error))?;
            Ok(HederaTokenDeployment::new(
                chain,
                address,
                accept_custom_decimals(accept)?,
            ))
        }
    }
}