//! GNACS解析器模块

/// 资产类型
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum AssetType {
    /// 不动产收益权
    RealEstateRevenue,
    /// 股权
    Equity,
    /// 债权
    Debt,
    /// 商品
    Commodity,
    /// 其他
    Other(String),
}

/// 风险等级
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
#[repr(u8)]
pub enum RiskLevel {
    /// 低风险
    Low = 1,
    /// 中风险
    Medium = 2,
    /// 高风险
    High = 3,
}

/// GNACS解析结果
#[derive(Debug, Clone)]
pub struct GNACSInfo {
    /// 资产类型
    pub asset_type: AssetType,
    /// 风险权重（巴塞尔III）
    pub risk_weight: u8,
    /// 合规等级
    pub compliance_level: u8,
    /// 实时状态
    pub status: u8,
}

/// GNACS解析器
pub struct GNACSParser;

impl GNACSParser {
    /// 解析GNACS编码
    pub fn parse(gnacs: &[u8; 6]) -> GNACSInfo {
        let asset_type_code = gnacs[0];
        let risk_weight = gnacs[1];
        let compliance_level = gnacs[2];
        let status = gnacs[5];

        let asset_type = match asset_type_code {
            0x01 => AssetType::RealEstateRevenue,
            0x02 => AssetType::Equity,
            0x03 => AssetType::Debt,
            0x04 => AssetType::Commodity,
            _ => AssetType::Other(format!("Unknown({})", asset_type_code)),
        };

        GNACSInfo {
            asset_type,
            risk_weight,
            compliance_level,
            status,
        }
    }

    /// 获取资产类型描述
    pub fn asset_type_description(asset_type: &AssetType) -> String {
        match asset_type {
            AssetType::RealEstateRevenue => "不动产收益权".to_string(),
            AssetType::Equity => "股权".to_string(),
            AssetType::Debt => "债权".to_string(),
            AssetType::Commodity => "商品".to_string(),
            AssetType::Other(s) => s.clone(),
        }
    }

    /// 获取风险等级
    pub fn risk_level(risk_weight: u8) -> RiskLevel {
        match risk_weight {
            0..=50 => RiskLevel::Low,
            51..=100 => RiskLevel::Medium,
            _ => RiskLevel::High,
        }
    }
}