//! NAC CSNP L1层 - Charter合约实现
//! 
//! 实现CSNP网络配置合约
//! 基于CSNP V2.0技术白皮书

use nac_udm::primitives::{Address, Hash};
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use thiserror::Error;

#[derive(Debug, Error)]
pub enum CsnpL1Error {
    #[error("Invalid configuration: {0}")]
    InvalidConfiguration(String),
    
    #[error("Unauthorized: {0:?}")]
    Unauthorized(Address),
    
    #[error("Configuration not found: {0}")]
    NotFound(String),
}

/// GIDS配置
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct GidsConfig {
    /// DHT节点数量
    pub dht_node_count: u32,
    /// 链上注册表合约地址
    pub registry_contract: Address,
    /// 信誉聚合权重
    pub reputation_weights: HashMap<u64, f64>,  // chain_id -> weight
    /// 缓存TTL（秒）
    pub cache_ttl_secs: u64,
}

impl Default for GidsConfig {
    fn default() -> Self {
        Self {
            dht_node_count: 100,
            registry_contract: Address::zero(),
            reputation_weights: HashMap::new(),
            cache_ttl_secs: 3600,
        }
    }
}

/// AA-PE传播策略配置
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AaPeConfig {
    /// 即时广播的最大延迟（毫秒）
    pub immediate_broadcast_max_latency_ms: u64,
    /// 定向推送的目标节点数
    pub targeted_push_node_count: u32,
    /// 警报通道优先级
    pub alert_channel_priority: u8,
    /// 缓存TTL（秒）
    pub cache_ttl_secs: u64,
}

impl Default for AaPeConfig {
    fn default() -> Self {
        Self {
            immediate_broadcast_max_latency_ms: 200,
            targeted_push_node_count: 10,
            alert_channel_priority: 255,
            cache_ttl_secs: 3600,
        }
    }
}

/// FTAN配置
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct FtanConfig {
    /// 聚合节点数量
    pub aggregator_count: u32,
    /// 批量大小
    pub batch_size: u32,
    /// 聚合超时（毫秒）
    pub aggregation_timeout_ms: u64,
}

impl Default for FtanConfig {
    fn default() -> Self {
        Self {
            aggregator_count: 50,
            batch_size: 100,
            aggregation_timeout_ms: 500,
        }
    }
}

/// UCA配置
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct UcaConfig {
    /// 审计日志保留期（天）
    pub audit_log_retention_days: u32,
    /// 跨链验证节点数
    pub cross_chain_validator_count: u32,
    /// 违规惩罚系数
    pub violation_penalty_factor: f64,
}

impl Default for UcaConfig {
    fn default() -> Self {
        Self {
            audit_log_retention_days: 365,
            cross_chain_validator_count: 21,
            violation_penalty_factor: 0.1,
        }
    }
}

/// CSNP网络配置合约
pub struct CsnpConfigContract {
    /// GIDS配置
    gids_config: GidsConfig,
    /// AA-PE配置
    aape_config: AaPeConfig,
    /// FTAN配置
    ftan_config: FtanConfig,
    /// UCA配置
    uca_config: UcaConfig,
    /// 管理员地址
    admin: Address,
}

impl CsnpConfigContract {
    /// 创建新的CSNP配置合约
    pub fn new(admin: Address) -> Self {
        Self {
            gids_config: GidsConfig::default(),
            aape_config: AaPeConfig::default(),
            ftan_config: FtanConfig::default(),
            uca_config: UcaConfig::default(),
            admin,
        }
    }

    /// 更新GIDS配置
    pub fn update_gids_config(
        &mut self,
        caller: Address,
        config: GidsConfig,
    ) -> Result<(), CsnpL1Error> {
        if caller != self.admin {
            return Err(CsnpL1Error::Unauthorized(caller));
        }

        // 验证配置
        if config.dht_node_count < 10 {
            return Err(CsnpL1Error::InvalidConfiguration(
                "DHT节点数量至少为10".to_string()
            ));
        }

        self.gids_config = config;
        Ok(())
    }

    /// 更新AA-PE配置
    pub fn update_aape_config(
        &mut self,
        caller: Address,
        config: AaPeConfig,
    ) -> Result<(), CsnpL1Error> {
        if caller != self.admin {
            return Err(CsnpL1Error::Unauthorized(caller));
        }

        // 验证配置
        if config.immediate_broadcast_max_latency_ms > 1000 {
            return Err(CsnpL1Error::InvalidConfiguration(
                "即时广播延迟不能超过1000ms".to_string()
            ));
        }

        self.aape_config = config;
        Ok(())
    }

    /// 更新FTAN配置
    pub fn update_ftan_config(
        &mut self,
        caller: Address,
        config: FtanConfig,
    ) -> Result<(), CsnpL1Error> {
        if caller != self.admin {
            return Err(CsnpL1Error::Unauthorized(caller));
        }

        self.ftan_config = config;
        Ok(())
    }

    /// 更新UCA配置
    pub fn update_uca_config(
        &mut self,
        caller: Address,
        config: UcaConfig,
    ) -> Result<(), CsnpL1Error> {
        if caller != self.admin {
            return Err(CsnpL1Error::Unauthorized(caller));
        }

        self.uca_config = config;
        Ok(())
    }

    /// 获取GIDS配置
    pub fn get_gids_config(&self) -> &GidsConfig {
        &self.gids_config
    }

    /// 获取AA-PE配置
    pub fn get_aape_config(&self) -> &AaPeConfig {
        &self.aape_config
    }

    /// 获取FTAN配置
    pub fn get_ftan_config(&self) -> &FtanConfig {
        &self.ftan_config
    }

    /// 获取UCA配置
    pub fn get_uca_config(&self) -> &UcaConfig {
        &self.uca_config
    }

    /// 转移管理员权限
    pub fn transfer_admin(
        &mut self,
        caller: Address,
        new_admin: Address,
    ) -> Result<(), CsnpL1Error> {
        if caller != self.admin {
            return Err(CsnpL1Error::Unauthorized(caller));
        }

        self.admin = new_admin;
        Ok(())
    }
}