// SPDX-License-Identifier: MIT
pragma solidity ^0.8.30;

/// @title Constants
/// @notice Protocol-wide constants and the `bytes32` tags used inside signed intents.
/// @dev All rates/thresholds are basis points: `BPS = 10_000` is 100%. Interest math uses
///      simple (non-compounding) accrual over `SECONDS_PER_YEAR`.
library Constants {
    /// @notice Basis-points denominator. 10_000 bps = 100%.
    uint256 internal constant BPS = 10_000;

    /// @notice Seconds in a year used for interest accrual (365 days = 31_536_000).
    uint256 internal constant SECONDS_PER_YEAR = 365 days;

    /// @notice `intentType` tag for a borrow intent.
    bytes32 internal constant INTENT_TYPE_BORROW = keccak256("BORROW");

    /// @notice `intentType` tag for a lend intent.
    bytes32 internal constant INTENT_TYPE_LEND = keccak256("LEND");

    /// @notice `rateType` tag for a fixed-rate intent.
    bytes32 internal constant RATE_TYPE_FIXED = keccak256("FIXED");

    /// @notice `rateType` tag for a variable-rate intent.
    bytes32 internal constant RATE_TYPE_VARIABLE = keccak256("VARIABLE");
}