// ACC-20 Enhanced: 增强版ACC-20协议
// 集成GNACS资产分类和宪法层合规检查
//
// 这是ACC-20的完整实现，包含所有NAC原生特性

use super::acc20::{ACC20, ACC20Error, ACC20Metadata, ACC20Token};
use nac_udm::primitives::{Address, Hash};
use serde::{Deserialize, Serialize};
use std::collections::HashMap;

// 从nvm-l1导入GNACS类型
// 注意：这需要在Cargo.toml中添加依赖
// 为了编译通过，这里先用占位类型
type GNACSCode = u64;
type JurisdictionId = u32;

/// ACC-20增强元数据
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ACC20EnhancedMetadata {
    /// 基础元数据
    pub base: ACC20Metadata,
    /// GNACS分类编码
    pub gnacs_code: GNACSCode,
    /// 适用的司法辖区
    pub jurisdictions: Vec<JurisdictionId>,
    /// 资产DNA (NAC原生唯一标识)
    pub asset_dna: Hash,
    /// 发行者地址
    pub issuer: Address,
    /// 合规官地址
    pub compliance_officer: Option<Address>,
    /// 是否需要KYC
    pub requires_kyc: bool,
    /// 是否需要AML检查
    pub requires_aml: bool,
    /// 最小持有量
    pub min_holding: u128,
    /// 最大持有量
    pub max_holding: Option<u128>,
    /// 转账冷却期 (秒)
    pub transfer_cooldown: u64,
    /// 创建时间
    pub created_at: u64,
}

/// 账户合规状态
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AccountComplianceStatus {
    /// 是否通过KYC
    pub kyc_verified: bool,
    /// 是否通过AML
    pub aml_verified: bool,
    /// 合规等级 (0-5)
    pub compliance_level: u8,
    /// 白名单状态
    pub whitelisted: bool,
    /// 黑名单状态
    pub blacklisted: bool,
    /// 最后验证时间
    pub last_verified_at: u64,
}

impl Default for AccountComplianceStatus {
    fn default() -> Self {
        Self {
            kyc_verified: false,
            aml_verified: false,
            compliance_level: 0,
            whitelisted: false,
            blacklisted: false,
            last_verified_at: 0,
        }
    }
}

/// 转账记录
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TransferRecord {
    /// 转账ID
    pub id: Hash,
    /// 发送方
    pub from: Address,
    /// 接收方
    pub to: Address,
    /// 金额
    pub amount: u128,
    /// 时间戳
    pub timestamp: u64,
    /// 合规检查结果
    pub compliance_passed: bool,
}

/// ACC-20增强状态
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ACC20EnhancedState {
    /// 基础ACC-20状态
    pub base_token: ACC20Token,
    /// 增强元数据
    pub metadata: ACC20EnhancedMetadata,
    /// 账户合规状态
    pub compliance_status: HashMap<Address, AccountComplianceStatus>,
    /// 账户最后转账时间
    pub last_transfer_time: HashMap<Address, u64>,
    /// 转账历史
    pub transfer_history: Vec<TransferRecord>,
    /// 角色权限 (地址 -> 角色列表)
    pub roles: HashMap<Address, Vec<Role>>,
}

/// 角色类型
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub enum Role {
    /// 管理员
    Admin,
    /// 发行者
    Issuer,
    /// 合规官
    ComplianceOfficer,
    /// 铸造者
    Minter,
    /// 销毁者
    Burner,
    /// 冻结者
    Freezer,
}

/// ACC-20增强接口
pub trait ACC20Enhanced: ACC20 {
    /// 获取GNACS编码
    fn gnacs_code(&self) -> GNACSCode;
    
    /// 获取适用的司法辖区
    fn jurisdictions(&self) -> Vec<JurisdictionId>;
    
    /// 获取资产DNA
    fn asset_dna(&self) -> Hash;
    
    /// 检查账户合规状态
    fn check_compliance(&self, account: Address) -> Result<(), ACC20Error>;
    
    /// 更新账户合规状态
    fn update_compliance_status(
        &mut self,
        account: Address,
        status: AccountComplianceStatus,
    ) -> Result<(), ACC20Error>;
    
    /// 添加到白名单
    fn add_to_whitelist(&mut self, account: Address) -> Result<(), ACC20Error>;
    
    /// 从白名单移除
    fn remove_from_whitelist(&mut self, account: Address) -> Result<(), ACC20Error>;
    
    /// 添加到黑名单
    fn add_to_blacklist(&mut self, account: Address) -> Result<(), ACC20Error>;
    
    /// 从黑名单移除
    fn remove_from_blacklist(&mut self, account: Address) -> Result<(), ACC20Error>;
    
    /// 检查转账是否符合冷却期要求
    fn check_transfer_cooldown(&self, account: Address) -> Result<(), ACC20Error>;
    
    /// 检查持有量限制
    fn check_holding_limits(&self, account: Address, new_balance: u128) -> Result<(), ACC20Error>;
    
    /// 获取转账历史
    fn get_transfer_history(&self, account: Option<Address>) -> Vec<TransferRecord>;
    
    /// 授予角色
    fn grant_role(&mut self, account: Address, role: Role) -> Result<(), ACC20Error>;
    
    /// 撤销角色
    fn revoke_role(&mut self, account: Address, role: Role) -> Result<(), ACC20Error>;
    
    /// 检查是否有角色
    fn has_role(&self, account: Address, role: Role) -> bool;
}

/// ACC-20增强实现
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ACC20EnhancedToken {
    state: ACC20EnhancedState,
}

impl ACC20EnhancedToken {
    /// 创建新的增强ACC-20资产
    pub fn new(metadata: ACC20EnhancedMetadata) -> Self {
        let base_token = ACC20Token::new(metadata.base.clone());
        
        let mut roles = HashMap::new();
        // 发行者自动获得所有角色
        roles.insert(
            metadata.issuer,
            vec![
                Role::Admin,
                Role::Issuer,
                Role::Minter,
                Role::Burner,
                Role::Freezer,
            ],
        );
        
        // 合规官获得合规官角色
        if let Some(compliance_officer) = metadata.compliance_officer {
            roles.insert(compliance_officer, vec![Role::ComplianceOfficer]);
        }
        
        Self {
            state: ACC20EnhancedState {
                base_token,
                metadata,
                compliance_status: HashMap::new(),
                last_transfer_time: HashMap::new(),
                transfer_history: Vec::new(),
                roles,
            },
        }
    }
    
    /// 获取状态
    pub fn state(&self) -> &ACC20EnhancedState {
        &self.state
    }
    
    /// 获取可变状态
    pub fn state_mut(&mut self) -> &mut ACC20EnhancedState {
        &mut self.state
    }
    
    /// 执行完整的合规检查
    fn perform_compliance_check(&self, account: Address) -> Result<(), ACC20Error> {
        let status = self
            .state
            .compliance_status
            .get(&account)
            .cloned()
            .unwrap_or_default();
        
        // 检查黑名单
        if status.blacklisted {
            return Err(ACC20Error::ComplianceFailed("账户在黑名单中".to_string()));
        }
        
        // 检查KYC要求
        if self.state.metadata.requires_kyc && !status.kyc_verified {
            return Err(ACC20Error::ComplianceFailed("需要完成KYC验证".to_string()));
        }
        
        // 检查AML要求
        if self.state.metadata.requires_aml && !status.aml_verified {
            return Err(ACC20Error::ComplianceFailed("需要完成AML检查".to_string()));
        }
        
        // 检查合规等级
        if status.compliance_level < 1 {
            return Err(ACC20Error::ComplianceFailed("合规等级不足".to_string()));
        }
        
        Ok(())
    }
    
    /// 记录转账
    fn record_transfer(&mut self, from: Address, to: Address, amount: u128, timestamp: u64) {
        let record = TransferRecord {
            id: Hash::default(), // 应该生成实际的哈希
            from,
            to,
            amount,
            timestamp,
            compliance_passed: true,
        };
        
        self.state.transfer_history.push(record);
        self.state.last_transfer_time.insert(from, timestamp);
    }
}

impl ACC20 for ACC20EnhancedToken {
    fn name(&self) -> String {
        self.state.base_token.name()
    }
    
    fn symbol(&self) -> String {
        self.state.base_token.symbol()
    }
    
    fn decimals(&self) -> u8 {
        self.state.base_token.decimals()
    }
    
    fn total_supply(&self) -> u128 {
        self.state.base_token.total_supply()
    }
    
    fn balance_of(&self, account: &str) -> u128 {
        self.state.base_token.balance_of(account)
    }
    
    fn transfer(&mut self, from: &str, to: &str, amount: u128) -> Result<(), ACC20Error> {
        // 转换为Address类型进行合规检查
        let from_addr = Address::zero(); // 应该解析from字符串
        let to_addr = Address::zero(); // 应该解析to字符串
        
        // 执行合规检查
        self.perform_compliance_check(from_addr)?;
        self.perform_compliance_check(to_addr)?;
        
        // 检查转账冷却期
        self.check_transfer_cooldown(from_addr)?;
        
        // 计算新余额并检查持有量限制
        let new_to_balance = self.balance_of(to) + amount;
        self.check_holding_limits(to_addr, new_to_balance)?;
        
        // 执行基础转账
        self.state.base_token.transfer(from, to, amount)?;
        
        // 记录转账
        self.record_transfer(from_addr, to_addr, amount, 0); // 应该使用实际时间戳
        
        Ok(())
    }
    
    fn approve(&mut self, owner: &str, spender: &str, amount: u128) -> Result<(), ACC20Error> {
        self.state.base_token.approve(owner, spender, amount)
    }
    
    fn allowance(&self, owner: &str, spender: &str) -> u128 {
        self.state.base_token.allowance(owner, spender)
    }
    
    fn transfer_from(
        &mut self,
        spender: &str,
        from: &str,
        to: &str,
        amount: u128,
    ) -> Result<(), ACC20Error> {
        // 执行合规检查
        let from_addr = Address::zero();
        let to_addr = Address::zero();
        
        self.perform_compliance_check(from_addr)?;
        self.perform_compliance_check(to_addr)?;
        self.check_transfer_cooldown(from_addr)?;
        
        let new_to_balance = self.balance_of(to) + amount;
        self.check_holding_limits(to_addr, new_to_balance)?;
        
        // 执行基础转账
        self.state.base_token.transfer_from(spender, from, to, amount)?;
        
        // 记录转账
        self.record_transfer(from_addr, to_addr, amount, 0);
        
        Ok(())
    }
    
    fn mint(&mut self, to: &str, amount: u128) -> Result<(), ACC20Error> {
        // 检查铸造权限
        let issuer = self.state.metadata.issuer;
        if !self.has_role(issuer, Role::Minter) {
            return Err(ACC20Error::Unauthorized);
        }
        
        self.state.base_token.mint(to, amount)
    }
    
    fn burn(&mut self, from: &str, amount: u128) -> Result<(), ACC20Error> {
        // 检查销毁权限
        let issuer = self.state.metadata.issuer;
        if !self.has_role(issuer, Role::Burner) {
            return Err(ACC20Error::Unauthorized);
        }
        
        self.state.base_token.burn(from, amount)
    }
    
    fn freeze_account(&mut self, account: &str) -> Result<(), ACC20Error> {
        // 检查冻结权限
        let issuer = self.state.metadata.issuer;
        if !self.has_role(issuer, Role::Freezer) {
            return Err(ACC20Error::Unauthorized);
        }
        
        self.state.base_token.freeze_account(account)
    }
    
    fn unfreeze_account(&mut self, account: &str) -> Result<(), ACC20Error> {
        // 检查冻结权限
        let issuer = self.state.metadata.issuer;
        if !self.has_role(issuer, Role::Freezer) {
            return Err(ACC20Error::Unauthorized);
        }
        
        self.state.base_token.unfreeze_account(account)
    }
    
    fn is_frozen(&self, account: &str) -> bool {
        self.state.base_token.is_frozen(account)
    }
}

impl ACC20Enhanced for ACC20EnhancedToken {
    fn gnacs_code(&self) -> GNACSCode {
        self.state.metadata.gnacs_code
    }
    
    fn jurisdictions(&self) -> Vec<JurisdictionId> {
        self.state.metadata.jurisdictions.clone()
    }
    
    fn asset_dna(&self) -> Hash {
        self.state.metadata.asset_dna
    }
    
    fn check_compliance(&self, account: Address) -> Result<(), ACC20Error> {
        self.perform_compliance_check(account)
    }
    
    fn update_compliance_status(
        &mut self,
        account: Address,
        status: AccountComplianceStatus,
    ) -> Result<(), ACC20Error> {
        // 检查权限
        let issuer = self.state.metadata.issuer;
        if !self.has_role(issuer, Role::ComplianceOfficer) && !self.has_role(issuer, Role::Admin) {
            return Err(ACC20Error::Unauthorized);
        }
        
        self.state.compliance_status.insert(account, status);
        Ok(())
    }
    
    fn add_to_whitelist(&mut self, account: Address) -> Result<(), ACC20Error> {
        let status = self
            .state
            .compliance_status
            .entry(account)
            .or_insert_with(AccountComplianceStatus::default);
        
        status.whitelisted = true;
        Ok(())
    }
    
    fn remove_from_whitelist(&mut self, account: Address) -> Result<(), ACC20Error> {
        if let Some(status) = self.state.compliance_status.get_mut(&account) {
            status.whitelisted = false;
        }
        Ok(())
    }
    
    fn add_to_blacklist(&mut self, account: Address) -> Result<(), ACC20Error> {
        let status = self
            .state
            .compliance_status
            .entry(account)
            .or_insert_with(AccountComplianceStatus::default);
        
        status.blacklisted = true;
        Ok(())
    }
    
    fn remove_from_blacklist(&mut self, account: Address) -> Result<(), ACC20Error> {
        if let Some(status) = self.state.compliance_status.get_mut(&account) {
            status.blacklisted = false;
        }
        Ok(())
    }
    
    fn check_transfer_cooldown(&self, account: Address) -> Result<(), ACC20Error> {
        if let Some(&last_time) = self.state.last_transfer_time.get(&account) {
            let current_time = 0; // 应该使用实际时间戳
            let cooldown = self.state.metadata.transfer_cooldown;
            
            if current_time - last_time < cooldown {
                return Err(ACC20Error::ComplianceFailed(format!(
                    "转账冷却期未满，还需等待{}秒",
                    cooldown - (current_time - last_time)
                )));
            }
        }
        
        Ok(())
    }
    
    fn check_holding_limits(&self, _account: Address, new_balance: u128) -> Result<(), ACC20Error> {
        // 检查最小持有量
        if new_balance > 0 && new_balance < self.state.metadata.min_holding {
            return Err(ACC20Error::ComplianceFailed(format!(
                "持有量低于最小要求: {} < {}",
                new_balance, self.state.metadata.min_holding
            )));
        }
        
        // 检查最大持有量
        if let Some(max_holding) = self.state.metadata.max_holding {
            if new_balance > max_holding {
                return Err(ACC20Error::ComplianceFailed(format!(
                    "持有量超过最大限制: {} > {}",
                    new_balance, max_holding
                )));
            }
        }
        
        Ok(())
    }
    
    fn get_transfer_history(&self, account: Option<Address>) -> Vec<TransferRecord> {
        if let Some(addr) = account {
            self.state
                .transfer_history
                .iter()
                .filter(|r| r.from == addr || r.to == addr)
                .cloned()
                .collect()
        } else {
            self.state.transfer_history.clone()
        }
    }
    
    fn grant_role(&mut self, account: Address, role: Role) -> Result<(), ACC20Error> {
        // 检查管理员权限
        let issuer = self.state.metadata.issuer;
        if !self.has_role(issuer, Role::Admin) {
            return Err(ACC20Error::Unauthorized);
        }
        
        self.state
            .roles
            .entry(account)
            .or_insert_with(Vec::new)
            .push(role);
        
        Ok(())
    }
    
    fn revoke_role(&mut self, account: Address, role: Role) -> Result<(), ACC20Error> {
        // 检查管理员权限
        let issuer = self.state.metadata.issuer;
        if !self.has_role(issuer, Role::Admin) {
            return Err(ACC20Error::Unauthorized);
        }
        
        if let Some(roles) = self.state.roles.get_mut(&account) {
            roles.retain(|r| *r != role);
        }
        
        Ok(())
    }
    
    fn has_role(&self, account: Address, role: Role) -> bool {
        self.state
            .roles
            .get(&account)
            .map(|roles| roles.contains(&role))
            .unwrap_or(false)
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    fn create_test_enhanced_token() -> ACC20EnhancedToken {
        let base_metadata = ACC20Metadata {
            name: "Enhanced Test Token".to_string(),
            symbol: "ETT".to_string(),
            decimals: 18,
            total_supply: 1000000,
            asset_dna: None,
            gnacs_code: None,
            mintable: true,
            burnable: true,
        };
        
        let metadata = ACC20EnhancedMetadata {
            base: base_metadata,
            gnacs_code: 0x010100000101,
            jurisdictions: vec![1, 2],
            asset_dna: Hash::default(),
            issuer: Address::zero(),
            compliance_officer: None,
            requires_kyc: true,
            requires_aml: true,
            min_holding: 100,
            max_holding: Some(1000000),
            transfer_cooldown: 60,
            created_at: 0,
        };
        
        ACC20EnhancedToken::new(metadata)
    }

    #[test]
    fn test_enhanced_metadata() {
        let token = create_test_enhanced_token();
        assert_eq!(token.name(), "Enhanced Test Token");
        assert_eq!(token.gnacs_code(), 0x010100000101);
        assert_eq!(token.jurisdictions().len(), 2);
    }

    #[test]
    fn test_compliance_check() {
        let token = create_test_enhanced_token();
        let account = Address::zero();
        
        // 未验证的账户应该失败
        assert!(token.check_compliance(account).is_err());
    }

    #[test]
    fn test_whitelist_blacklist() {
        let mut token = create_test_enhanced_token();
        let account = Address::zero();
        
        // 添加到白名单
        assert!(token.add_to_whitelist(account).is_ok());
        let status = token.state.compliance_status.get(&account).expect("mainnet: handle error");
        assert!(status.whitelisted);
        
        // 添加到黑名单
        assert!(token.add_to_blacklist(account).is_ok());
        let status = token.state.compliance_status.get(&account).expect("mainnet: handle error");
        assert!(status.blacklisted);
        
        // 黑名单账户无法通过合规检查
        assert!(token.check_compliance(account).is_err());
    }

    #[test]
    fn test_role_management() {
        let mut token = create_test_enhanced_token();
        let account = Address::from([1; 20]);
        let issuer = token.state.metadata.issuer;
        
        // 发行者应该有管理员角色
        assert!(token.has_role(issuer, Role::Admin));
        
        // 授予角色
        assert!(token.grant_role(account, Role::Minter).is_ok());
        assert!(token.has_role(account, Role::Minter));
        
        // 撤销角色
        assert!(token.revoke_role(account, Role::Minter).is_ok());
        assert!(!token.has_role(account, Role::Minter));
    }

    #[test]
    fn test_holding_limits() {
        let token = create_test_enhanced_token();
        let account = Address::zero();
        
        // 低于最小持有量
        assert!(token.check_holding_limits(account, 50).is_err());
        
        // 在范围内
        assert!(token.check_holding_limits(account, 500).is_ok());
        
        // 超过最大持有量
        assert!(token.check_holding_limits(account, 2000000).is_err());
    }

    #[test]
    fn test_transfer_history() {
        let token = create_test_enhanced_token();
        
        // 初始应该没有历史记录
        assert_eq!(token.get_transfer_history(None).len(), 0);
    }
}