// ACC-Collateral: 抵押协议
// NAC 原生协议 - Charter 语言定义（XTZH 计价）
// UID: nac.acc.ACCCollateralProtocol.v1

protocol ACCCollateralProtocol {
    // 创建抵押记录（需要满足最低抵押率）
    fn create_collateral(
        asset_id: Hash, borrower: Address, lender: Address,
        collateral_value_xtzh: u128, loan_amount_xtzh: u128,
        maturity_secs: u64, constitutional_receipt: Hash
    ) -> Result<Hash, Error>;
    // 清算抵押（当抵押率低于清算阈值时）
    fn liquidate(
        collateral_id: Hash, liquidator: Address, current_value: u128,
        constitutional_receipt: Hash
    ) -> Result<u128, Error>;
    // 释放抵押（还款后）
    fn release_collateral(collateral_id: Hash, initiator: Address) -> Result<(), Error>;
    // 查询抵押记录
    fn get_collateral(collateral_id: Hash) -> Option<CollateralRecord>;
}