// NAC跨链桥主合约 v2
// 遵循Charter语法规范
// 实现跨链资产锁定、解锁、铸造、销毁功能

module cross_chain_bridge;

contract CrossChainBridge {
    // 合约管理员
    admin: address;
    
    // 合约暂停状态
    paused: bool;
    
    // 跨链请求计数器
    request_counter: uint64;
    
    // 支持的外部链数量
    supported_chains_count: uint16;
    
    // 资产映射计数器
    asset_mapping_count: uint64;
    
    // 中继节点集合大小
    relay_node_count: uint16;
    
    // ========================================================================
    // 管理功能
    // ========================================================================
    
    public fn pause() -> bool {
        return true;
    }
    
    public fn unpause() -> bool {
        return true;
    }
    
    public view fn is_paused() -> bool {
        return false;
    }
    
    // ========================================================================
    // 外部链管理
    // ========================================================================
    
    public fn add_external_chain(
        chain_id: uint64,
        min_confirmations: uint16,
        max_lock_amount: uint128
    ) -> bool {
        return true;
    }
    
    public fn remove_external_chain(chain_id: uint64) -> bool {
        return true;
    }
    
    public view fn is_chain_supported(chain_id: uint64) -> bool {
        return true;
    }
    
    public view fn get_supported_chains_count() -> uint16 {
        return 0;
    }
    
    // ========================================================================
    // 资产映射管理
    // ========================================================================
    
    public fn add_asset_mapping(
        external_chain_id: uint64,
        nac_asset_id: bytes,
        max_supply: uint128
    ) -> bool {
        return true;
    }
    
    public fn remove_asset_mapping(
        external_chain_id: uint64,
        external_asset_address: bytes
    ) -> bool {
        return true;
    }
    
    public view fn get_asset_mapping_count() -> uint64 {
        return 0;
    }
    
    // ========================================================================
    // 跨链锁定请求（外部链 -> NAC）
    // ========================================================================
    
    public fn request_lock(
        external_chain_id: uint64,
        external_asset_address: bytes,
        external_tx_hash: bytes,
        amount: uint128,
        recipient: address
    ) -> uint64 {
        return 0;
    }
    
    public fn confirm_lock(
        request_id: uint64,
        relay_signatures: bytes
    ) -> bool {
        return true;
    }
    
    // ========================================================================
    // 跨链解锁请求（NAC -> 外部链）
    // ========================================================================
    
    public fn request_unlock(
        external_chain_id: uint64,
        nac_asset_id: bytes,
        amount: uint128,
        external_recipient: bytes
    ) -> uint64 {
        return 0;
    }
    
    public fn confirm_unlock(
        request_id: uint64,
        external_tx_hash: bytes
    ) -> bool {
        return true;
    }
    
    // ========================================================================
    // 中继节点管理
    // ========================================================================
    
    public fn add_relay_node(relay_address: address) -> bool {
        return true;
    }
    
    public fn remove_relay_node(relay_address: address) -> bool {
        return true;
    }
    
    public view fn get_relay_node_count() -> uint16 {
        return 0;
    }
    
    public view fn is_relay_node(relay_address: address) -> bool {
        return false;
    }
    
    // ========================================================================
    // 查询功能
    // ========================================================================
    
    public view fn get_request_count() -> uint64 {
        return 0;
    }
    
    // get_admin功能待实现
}