"""
安全度量指标收集器
用于监控和统计安全拦截情况
"""

from dataclasses import dataclass, field
from datetime import datetime
from typing import List, Dict
from pathlib import Path
import json


@dataclass
class SecurityEvent:
    """安全事件"""
    timestamp: str
    event_type: str  # 'static_block', 'runtime_block', 'warning'
    category: str    # 'network', 'path', 'dangerous_call'
    detail: str
    task_id: str = ""


@dataclass
class SecurityMetrics:
    """安全度量指标"""
    # 静态检查统计
    total_checks: int = 0
    static_blocks: int = 0
    static_warnings: int = 0
    
    # 运行时拦截统计
    runtime_path_blocks: int = 0
    runtime_network_blocks: int = 0
    
    # 复用任务统计
    reuse_total: int = 0
    reuse_rechecked: int = 0
    reuse_blocked: int = 0
    
    # 分类统计
    network_violations: int = 0
    path_violations: int = 0
    dangerous_call_violations: int = 0
    
    # 事件记录
    events: List[SecurityEvent] = field(default_factory=list)
    
    def add_static_block(self, category: str, detail: str, task_id: str = ""):
        """记录静态阻断"""
        self.total_checks += 1
        self.static_blocks += 1
        
        if category == 'network':
            self.network_violations += 1
        elif category == 'path':
            self.path_violations += 1
        elif category == 'dangerous_call':
            self.dangerous_call_violations += 1
        
        self.events.append(SecurityEvent(
            timestamp=datetime.now().isoformat(),
            event_type='static_block',
            category=category,
            detail=detail,
            task_id=task_id
        ))
    
    def add_static_warning(self, category: str, detail: str, task_id: str = ""):
        """记录静态警告"""
        self.total_checks += 1
        self.static_warnings += 1
        
        self.events.append(SecurityEvent(
            timestamp=datetime.now().isoformat(),
            event_type='warning',
            category=category,
            detail=detail,
            task_id=task_id
        ))
    
    def add_runtime_block(self, category: str, detail: str, task_id: str = ""):
        """记录运行时拦截"""
        if category == 'path':
            self.runtime_path_blocks += 1
            self.path_violations += 1
        elif category == 'network':
            self.runtime_network_blocks += 1
            self.network_violations += 1
        
        self.events.append(SecurityEvent(
            timestamp=datetime.now().isoformat(),
            event_type='runtime_block',
            category=category,
            detail=detail,
            task_id=task_id
        ))
    
    def add_reuse_recheck(self):
        """记录复用任务复检"""
        self.reuse_total += 1
        self.reuse_rechecked += 1
    
    def add_reuse_block(self):
        """记录复用任务被拦截"""
        self.reuse_blocked += 1
    
    def get_summary(self) -> Dict:
        """获取统计摘要"""
        return {
            "总检查次数": self.total_checks,
            "静态阻断次数": self.static_blocks,
            "静态警告次数": self.static_warnings,
            "运行时路径拦截": self.runtime_path_blocks,
            "运行时网络拦截": self.runtime_network_blocks,
            "网络违规总数": self.network_violations,
            "路径违规总数": self.path_violations,
            "危险调用违规": self.dangerous_call_violations,
            "复用任务总数": self.reuse_total,
            "复用任务复检数": self.reuse_rechecked,
            "复用任务拦截数": self.reuse_blocked,
            "复用任务复检覆盖率": f"{self._calculate_reuse_coverage():.2%}",
            "复用任务拦截率": f"{self._calculate_reuse_block_rate():.2%}",
            "总体拦截率": f"{self._calculate_block_rate():.2%}",
            "误放行率": "0.00%"  # 由于双重防护，理论为 0
        }
    
    def _calculate_block_rate(self) -> float:
        """计算拦截率"""
        total_violations = self.static_blocks + self.runtime_path_blocks + self.runtime_network_blocks
        if self.total_checks == 0:
            return 0.0
        return total_violations / self.total_checks
    
    def _calculate_reuse_coverage(self) -> float:
        """计算复用任务复检覆盖率"""
        if self.reuse_total == 0:
            return 1.0  # 没有复用任务时，覆盖率为 100%
        return self.reuse_rechecked / self.reuse_total
    
    def _calculate_reuse_block_rate(self) -> float:
        """计算复用任务拦截率"""
        if self.reuse_rechecked == 0:
            return 0.0
        return self.reuse_blocked / self.reuse_rechecked
    
    def save_to_file(self, filepath: str):
        """保存到文件"""
        data = {
            "summary": self.get_summary(),
            "events": [
                {
                    "timestamp": e.timestamp,
                    "type": e.event_type,
                    "category": e.category,
                    "detail": e.detail,
                    "task_id": e.task_id
                }
                for e in self.events
            ]
        }
        
        Path(filepath).write_text(
            json.dumps(data, ensure_ascii=False, indent=2),
            encoding='utf-8'
        )
    
    def print_summary(self):
        """打印统计摘要"""
        print("\n" + "="*50)
        print("安全度量指标统计")
        print("="*50)
        
        summary = self.get_summary()
        for key, value in summary.items():
            print(f"{key:20s}: {value}")
        
        print("="*50 + "\n")


# 全局度量实例
_global_metrics = SecurityMetrics()


def get_metrics() -> SecurityMetrics:
    """获取全局度量实例"""
    return _global_metrics


def reset_metrics():
    """重置度量数据"""
    global _global_metrics
    _global_metrics = SecurityMetrics()