///! ACC-20C - ACC-20兼容层协议
///!
///! 这是NAC与以太坊生态的战略桥梁，允许ACC-20资产在以太坊生态中流通。
///! 
///! 核心功能：
///! - 将ACC-20资产包装成ERC-721 NFT
///! - 在两条链之间同步状态
///! - 保持NAC的合规检查
///! - 生成符合OpenSea标准的元数据
///!
///! 注意：这是生态扩展，不是核心架构。随着NAC生态成熟，对ACC-20C的依赖会逐渐降低。

module acc20c;

use acc::acc20_enhanced::{ACC20Enhanced};
use asset::gnacs::{GNACSCode};
use sovereignty::types::{SovereigntyType};
use utils::crypto::{Hash, sha3_384_hash};

/// ACC-20C包装器合约
contract ACC20CWrapper {
    // ========== 基础信息 ==========
    
    /// NAC链上的ACC-20合约地址
    nac_contract_address: Address;
    
    /// 以太坊链上的ERC-721合约地址
    eth_contract_address: EthAddress;
    
    /// 底层资产地址
    underlying_asset: Address;
    
    /// 包装器配置
    config: WrapperConfig;
    
    // ========== 包装资产管理 ==========
    
    /// 已包装资产映射 (TokenId -> WrappedAsset)
    wrapped_assets: map<u256, WrappedAsset>;
    
    /// 锁定的持有量映射 (Address -> Amount)
    locked_holdings: map<Address, u128>;
    
    /// 下一个TokenId
    next_token_id: u256;
    
    // ========== 状态管理 ==========
    
    /// 包装器是否暂停
    paused: bool;
    
    /// 包装器所有者
    owner: Address;
    
    /// 合规官
    compliance_officer: Address;
    
    // ========== 构造函数 ==========
    
    public fn new(
        nac_contract_address: Address,
        eth_contract_address: EthAddress,
        underlying_asset: Address,
    ) -> Self {
        return Self {
            nac_contract_address,
            eth_contract_address,
            underlying_asset,
            config: WrapperConfig::default(),
            wrapped_assets: map::new(),
            locked_holdings: map::new(),
            next_token_id: 1,
            paused: false,
            owner: msg::sender(),
            compliance_officer: msg::sender(),
        };
    }
    
    // ========== 包装函数 ==========
    
    /// 包装ACC-20资产为ERC-721 NFT
    public fn wrap(amount: u128) -> Result<u256, Error> {
        // 1. 检查包装器状态
        if self.paused {
            return Err(Error::WrapperPaused);
        }
        
        // 2. 检查金额
        if amount < self.config.min_wrap_amount {
            return Err(Error::BelowMinimumWrapAmount);
        }
        
        let sender = msg::sender();
        
        // 3. 获取ACC-20合约
        let acc20 = ACC20Enhanced::at(self.nac_contract_address);
        
        // 4. 检查合规性
        self._check_wrap_compliance(sender, &acc20)?;
        
        // 5. 从用户转移ACC-20到包装器
        acc20.transfer_from(sender, contract::address(), amount)?;
        
        // 6. 记录锁定的持有量
        let current_locked = self.locked_holdings.get(sender).unwrap_or(0);
        self.locked_holdings.insert(sender, current_locked + amount);
        
        // 7. 生成TokenId
        let token_id = self.next_token_id;
        self.next_token_id = self.next_token_id + 1;
        
        // 8. 创建包装资产记录
        let wrapped_asset = WrappedAsset {
            token_id,
            nac_owner: sender,
            eth_owner: self._address_to_eth_address(sender),
            wrapped_amount: amount,
            wrap_timestamp: block::timestamp(),
            gnacs_code: acc20.get_gnacs_code(),
            sovereignty_type: acc20.get_sovereignty_type(),
            compliance_snapshot: self._capture_compliance_snapshot(sender, &acc20),
            is_frozen: false,
        };
        
        self.wrapped_assets.insert(token_id, wrapped_asset);
        
        // 9. 触发包装事件
        emit Wrapped(sender, token_id, amount);
        
        // 10. 触发跨链同步事件
        emit CrossChainSync(
            SyncType::Wrap,
            token_id,
            sender,
            self._address_to_eth_address(sender),
            amount,
        );
        
        return Ok(token_id);
    }
    
    /// 解包装ERC-721 NFT为ACC-20资产
    public fn unwrap(token_id: u256) -> Result<bool, Error> {
        // 1. 检查包装器状态
        if self.paused {
            return Err(Error::WrapperPaused);
        }
        
        // 2. 检查TokenId是否存在
        if !self.wrapped_assets.contains_key(token_id) {
            return Err(Error::TokenNotFound);
        }
        
        let sender = msg::sender();
        let wrapped_asset = self.wrapped_assets.get(token_id).unwrap();
        
        // 3. 检查所有权
        if wrapped_asset.nac_owner != sender {
            return Err(Error::NotOwner);
        }
        
        // 4. 检查是否冻结
        if wrapped_asset.is_frozen {
            return Err(Error::AssetFrozen);
        }
        
        // 5. 获取ACC-20合约
        let acc20 = ACC20Enhanced::at(self.nac_contract_address);
        
        // 6. 从包装器转移ACC-20回用户
        acc20.transfer(sender, wrapped_asset.wrapped_amount)?;
        
        // 7. 更新锁定的持有量
        let current_locked = self.locked_holdings.get(sender).unwrap_or(0);
        if current_locked >= wrapped_asset.wrapped_amount {
            self.locked_holdings.insert(sender, current_locked - wrapped_asset.wrapped_amount);
        }
        
        // 8. 删除包装资产记录
        self.wrapped_assets.remove(token_id);
        
        // 9. 触发解包装事件
        emit Unwrapped(sender, token_id, wrapped_asset.wrapped_amount);
        
        // 10. 触发跨链同步事件
        emit CrossChainSync(
            SyncType::Unwrap,
            token_id,
            sender,
            wrapped_asset.eth_owner,
            wrapped_asset.wrapped_amount,
        );
        
        return Ok(true);
    }
    
    // ========== 冻结管理 ==========
    
    /// 冻结包装资产
    public fn freeze_wrapped_asset(token_id: u256) -> Result<bool, Error> {
        self._only_compliance_officer()?;
        
        if !self.wrapped_assets.contains_key(token_id) {
            return Err(Error::TokenNotFound);
        }
        
        let mut wrapped_asset = self.wrapped_assets.get_mut(token_id).unwrap();
        wrapped_asset.is_frozen = true;
        
        emit WrappedAssetFrozen(token_id);
        
        // 触发跨链同步
        emit CrossChainSync(
            SyncType::Freeze,
            token_id,
            wrapped_asset.nac_owner,
            wrapped_asset.eth_owner,
            0,
        );
        
        return Ok(true);
    }
    
    /// 解冻包装资产
    public fn unfreeze_wrapped_asset(token_id: u256) -> Result<bool, Error> {
        self._only_compliance_officer()?;
        
        if !self.wrapped_assets.contains_key(token_id) {
            return Err(Error::TokenNotFound);
        }
        
        let mut wrapped_asset = self.wrapped_assets.get_mut(token_id).unwrap();
        wrapped_asset.is_frozen = false;
        
        emit WrappedAssetUnfrozen(token_id);
        
        // 触发跨链同步
        emit CrossChainSync(
            SyncType::Unfreeze,
            token_id,
            wrapped_asset.nac_owner,
            wrapped_asset.eth_owner,
            0,
        );
        
        return Ok(true);
    }
    
    // ========== 查询函数 ==========
    
    /// 获取包装资产信息
    public fn get_wrapped_asset(token_id: u256) -> Result<WrappedAsset, Error> {
        if !self.wrapped_assets.contains_key(token_id) {
            return Err(Error::TokenNotFound);
        }
        
        return Ok(self.wrapped_assets.get(token_id).unwrap().clone());
    }
    
    /// 获取用户锁定的持有量
    public fn get_locked_holdings(owner: Address) -> u128 {
        return self.locked_holdings.get(owner).unwrap_or(0);
    }
    
    /// 获取用户的所有包装资产
    public fn get_user_wrapped_assets(owner: Address) -> vec<u256> {
        let mut result = vec::new();
        
        for (token_id, wrapped_asset) in self.wrapped_assets.iter() {
            if wrapped_asset.nac_owner == owner {
                result.push(*token_id);
            }
        }
        
        return result;
    }
    
    /// 生成ERC-721元数据
    public fn generate_metadata(token_id: u256) -> Result<ERC721Metadata, Error> {
        if !self.wrapped_assets.contains_key(token_id) {
            return Err(Error::TokenNotFound);
        }
        
        let wrapped_asset = self.wrapped_assets.get(token_id).unwrap();
        let acc20 = ACC20Enhanced::at(self.nac_contract_address);
        
        // 构建元数据
        let metadata = ERC721Metadata {
            name: format!("Wrapped {} #{}", acc20.get_symbol(), token_id),
            description: format!(
                "Wrapped ACC-20 asset representing {} {} on NAC blockchain",
                wrapped_asset.wrapped_amount,
                acc20.get_symbol(),
            ),
            image: self.config.default_image_url.clone(),
            external_url: Some(format!("{}/asset/{}", self.config.explorer_url, token_id)),
            attributes: vec![
                MetadataAttribute {
                    trait_type: "Asset Symbol".to_string(),
                    value: acc20.get_symbol(),
                },
                MetadataAttribute {
                    trait_type: "Wrapped Amount".to_string(),
                    value: wrapped_asset.wrapped_amount.to_string(),
                },
                MetadataAttribute {
                    trait_type: "GNACS Code".to_string(),
                    value: wrapped_asset.gnacs_code.to_hex(),
                },
                MetadataAttribute {
                    trait_type: "Asset Category".to_string(),
                    value: wrapped_asset.gnacs_code.get_category().to_string(),
                },
                MetadataAttribute {
                    trait_type: "Sovereignty Type".to_string(),
                    value: wrapped_asset.sovereignty_type.to_string(),
                },
                MetadataAttribute {
                    trait_type: "Compliance Level".to_string(),
                    value: wrapped_asset.gnacs_code.get_compliance_level().to_string(),
                },
                MetadataAttribute {
                    trait_type: "Jurisdiction".to_string(),
                    value: wrapped_asset.gnacs_code.get_jurisdiction().to_string(),
                },
                MetadataAttribute {
                    trait_type: "Risk Level".to_string(),
                    value: wrapped_asset.gnacs_code.get_risk_level().to_string(),
                },
                MetadataAttribute {
                    trait_type: "Wrap Timestamp".to_string(),
                    value: wrapped_asset.wrap_timestamp.to_string(),
                },
                MetadataAttribute {
                    trait_type: "Frozen".to_string(),
                    value: wrapped_asset.is_frozen.to_string(),
                },
            ],
            background_color: Some("1a1a2e".to_string()),
        };
        
        return Ok(metadata);
    }
    
    // ========== 管理函数 ==========
    
    /// 暂停包装器
    public fn pause() -> Result<bool, Error> {
        self._only_owner()?;
        
        self.paused = true;
        
        emit WrapperPaused();
        
        return Ok(true);
    }
    
    /// 恢复包装器
    public fn unpause() -> Result<bool, Error> {
        self._only_owner()?;
        
        self.paused = false;
        
        emit WrapperUnpaused();
        
        return Ok(true);
    }
    
    /// 更新配置
    public fn update_config(new_config: WrapperConfig) -> Result<bool, Error> {
        self._only_owner()?;
        
        self.config = new_config;
        
        emit ConfigUpdated();
        
        return Ok(true);
    }
    
    // ========== 内部辅助函数 ==========
    
    /// 检查包装合规性
    fn _check_wrap_compliance(
        user: Address,
        acc20: &ACC20Enhanced,
    ) -> Result<(), Error> {
        // 1. 检查用户是否被冻结
        if acc20.is_frozen(user) {
            return Err(Error::AccountFrozen);
        }
        
        // 2. 检查KYC级别
        let kyc_level = acc20.get_kyc_level(user);
        if !self.config.allowed_kyc_levels.contains(&kyc_level) {
            return Err(Error::InsufficientKYC);
        }
        
        // 3. 检查AML状态
        let aml_status = acc20.get_aml_status(user);
        if aml_status == AMLStatus::HighRisk || aml_status == AMLStatus::Blocked {
            return Err(Error::AMLCheckFailed);
        }
        
        return Ok(());
    }
    
    /// 捕获合规快照
    fn _capture_compliance_snapshot(
        user: Address,
        acc20: &ACC20Enhanced,
    ) -> ComplianceSnapshot {
        return ComplianceSnapshot {
            kyc_level: acc20.get_kyc_level(user),
            aml_status: acc20.get_aml_status(user),
            compliance_status: acc20.get_compliance_status(),
            snapshot_time: block::timestamp(),
        };
    }
    
    /// NAC地址转以太坊地址
    fn _address_to_eth_address(nac_address: Address) -> EthAddress {
        // TODO: 实现地址映射逻辑
        return EthAddress::zero();
    }
    
    /// 仅所有者
    fn _only_owner() -> Result<(), Error> {
        if msg::sender() != self.owner {
            return Err(Error::OnlyOwner);
        }
        return Ok(());
    }
    
    /// 仅合规官
    fn _only_compliance_officer() -> Result<(), Error> {
        if msg::sender() != self.compliance_officer {
            return Err(Error::OnlyComplianceOfficer);
        }
        return Ok(());
    }
}

// ========== 辅助结构体 ==========

/// 包装器配置
struct WrapperConfig {
    /// 最小包装金额
    min_wrap_amount: u128,
    
    /// 包装手续费（基点）
    wrap_fee_bps: u16,
    
    /// 解包装手续费（基点）
    unwrap_fee_bps: u16,
    
    /// 手续费接收地址
    fee_recipient: Address,
    
    /// 允许的KYC级别
    allowed_kyc_levels: vec<KYCLevel>,
    
    /// 默认图片URL
    default_image_url: string,
    
    /// 区块浏览器URL
    explorer_url: string,
}

impl WrapperConfig {
    fn default() -> Self {
        return Self {
            min_wrap_amount: 1,
            wrap_fee_bps: 10,      // 0.1%
            unwrap_fee_bps: 10,    // 0.1%
            fee_recipient: Address::zero(),
            allowed_kyc_levels: vec![
                KYCLevel::Basic,
                KYCLevel::Intermediate,
                KYCLevel::Advanced,
                KYCLevel::Institutional,
            ],
            default_image_url: "https://nac.assets/default.png".to_string(),
            explorer_url: "https://explorer.nac.io".to_string(),
        };
    }
}

/// 包装资产
struct WrappedAsset {
    /// TokenId
    token_id: u256,
    
    /// NAC链上的所有者
    nac_owner: Address,
    
    /// 以太坊链上的所有者
    eth_owner: EthAddress,
    
    /// 包装的数量
    wrapped_amount: u128,
    
    /// 包装时间
    wrap_timestamp: Timestamp,
    
    /// GNACS编码
    gnacs_code: GNACSCode,
    
    /// 主权类型
    sovereignty_type: SovereigntyType,
    
    /// 合规快照
    compliance_snapshot: ComplianceSnapshot,
    
    /// 是否冻结
    is_frozen: bool,
}

/// 合规快照
struct ComplianceSnapshot {
    kyc_level: KYCLevel,
    aml_status: AMLStatus,
    compliance_status: ComplianceStatus,
    snapshot_time: Timestamp,
}

/// ERC-721元数据
struct ERC721Metadata {
    name: string,
    description: string,
    image: string,
    external_url: Option<string>,
    attributes: vec<MetadataAttribute>,
    background_color: Option<string>,
}

/// 元数据属性
struct MetadataAttribute {
    trait_type: string,
    value: string,
}

/// 以太坊地址类型
type EthAddress = [u8; 20];

/// 同步类型
enum SyncType {
    Wrap,       // 包装
    Unwrap,     // 解包装
    Transfer,   // 转账
    Freeze,     // 冻结
    Unfreeze,   // 解冻
}

// ========== 错误类型 ==========

enum Error {
    WrapperPaused,
    BelowMinimumWrapAmount,
    TokenNotFound,
    NotOwner,
    AssetFrozen,
    AccountFrozen,
    InsufficientKYC,
    AMLCheckFailed,
    OnlyOwner,
    OnlyComplianceOfficer,
}

// ========== 事件 ==========

event Wrapped(owner: Address, token_id: u256, amount: u128);
event Unwrapped(owner: Address, token_id: u256, amount: u128);
event WrappedAssetFrozen(token_id: u256);
event WrappedAssetUnfrozen(token_id: u256);
event WrapperPaused();
event WrapperUnpaused();
event ConfigUpdated();
event CrossChainSync(
    sync_type: SyncType,
    token_id: u256,
    nac_owner: Address,
    eth_owner: EthAddress,
    amount: u128,
);