office-rs 0.1.1

use std::collections::HashMap;
use std::sync::atomic::{ AtomicU64, Ordering };
use std::sync::{ Mutex, OnceLock };
use std::time::{ SystemTime, UNIX_EPOCH };

use chrono::Duration;

use crate::code::ErrorPattern;
use crate::context::ErrorContext;
use crate::error::code::ErrorCode;
use crate::{ ErrorCategory, ErrorSeverity, OfficeError };

#[derive(Debug)]
pub struct ErrorMonitor {
    stats: Mutex<HashMap<ErrorCode, ErrorStats>>,
    total_errors: AtomicU64,
}

pub struct ErrorReport {
    timestamp: SystemTime,
    error: OfficeError,
    stack_trace: String,
    system_info: SystemInfo,
    context: ErrorContext,
}

pub struct ReportFormat {
    pub format: String, // e.g., "json", "xml", "text"
    pub include_stack_trace: bool,
    pub include_system_info: bool,
}

pub struct SystemInfo {
    pub os: String,
    pub version: String,
    pub architecture: String,
}

pub struct ErrorMetrics {
    pub total_errors: u64,
    pub error_counts: HashMap<ErrorCode, u64>,
    pub average_response_time: f64, // in milliseconds
}

pub struct TrendAnalysis {
    pub error_code: ErrorCode,
    pub trend: Vec<(SystemTime, u64)>, // (timestamp, count)
}

impl ErrorMonitor {
    pub fn new() -> Self {
        Self {
            stats: Mutex::new(HashMap::new()),
            total_errors: AtomicU64::new(0),
        }
    }

    /// 记录错误
    pub fn record_error(&self, error: &OfficeError) {
        let error_code = error.error_code();
        let severity = error.severity();
        let category = error.category();
        let now = SystemTime::now().duration_since(UNIX_EPOCH).unwrap_or_default().as_secs();

        self.total_errors.fetch_add(1, Ordering::Relaxed);

        let mut stats = self.stats.lock().unwrap();
        let entry = stats.entry(error_code.clone()).or_insert(ErrorStats {
            error_code,
            count: 0,
            first_occurrence: now,
            last_occurrence: now,
            severity,
            category,
        });

        entry.count += 1;
        entry.last_occurrence = now;
    }

    /// 获取错误统计
    pub fn get_stats(&self) -> Vec<ErrorStats> {
        let stats = self.stats.lock().unwrap();
        stats.values().cloned().collect()
    }

    /// 异步记录错误
    pub async fn record_error_async(&self, error: &OfficeError) {
        // 实现异步错误记录
        todo!("Implement async error recording");
    }

    /// 异步获取统计信息
    pub async fn get_stats_async(&self) -> Vec<ErrorStats> {
        // 实现异步统计获取
        todo!("Implement async stats retrieval");
    }

    /// 检测错误模式
    pub fn detect_error_patterns(&self) -> Vec<ErrorPattern> {
        // 实现错误模式检测逻辑
        // 例如连续失败、周期性错误等
        todo!("Implement error pattern detection");
    }

    /// 设置错误阈值告警
    pub fn set_error_threshold(&self, category: ErrorCategory, threshold: u64) {
        // 实现错误阈值告警机制
        todo!("Implement error threshold alerting");
    }

    /// 获取总错误数
    pub fn total_errors(&self) -> u64 {
        self.total_errors.load(Ordering::Relaxed)
    }

    /// 获取最常见的错误
    pub fn most_common_errors(&self, limit: usize) -> Vec<ErrorStats> {
        let mut stats = self.get_stats();
        stats.sort_by(|a, b| b.count.cmp(&a.count));
        stats.into_iter().take(limit).collect()
    }

    /// 添加错误指标收集
    pub fn collect_metrics(&self) -> ErrorMetrics {
        // 实现错误指标收集
        todo!("Implement error metrics collection");
    }

    /// 提供错误趋势分析
    pub fn analyze_trends(&self, duration: Duration) -> TrendAnalysis {
        // 实现错误趋势分析
        todo!("Implement error trend analysis");
    }

    /// 生成详细错误报告
    pub fn generate_report(&self, error: &OfficeError) -> ErrorReport {
        // 实现详细错误报告生成
        todo!("Implement error report generation");
    }

    /// 导出错误统计报告
    pub fn export_stats_report(&self, format: ReportFormat) -> Vec<u8> {
        // 实现统计报告导出
        todo!("Implement stats report export");
    }

    /// 清除统计信息
    pub fn clear_stats(&self) {
        let mut stats = self.stats.lock().unwrap();
        stats.clear();
        self.total_errors.store(0, Ordering::Relaxed);
    }
}

/// 错误统计信息
#[derive(Debug, Clone)]
pub struct ErrorStats {
    pub error_code: ErrorCode,
    pub count: u64,
    pub first_occurrence: u64, // Unix timestamp
    pub last_occurrence: u64, // Unix timestamp
    pub severity: ErrorSeverity,
    pub category: ErrorCategory,
}

/// 全局错误监控器
static ERROR_MONITOR: OnceLock<ErrorMonitor> = OnceLock::new();

/// 获取全局错误监控器
pub fn error_monitor() -> &'static ErrorMonitor {
    ERROR_MONITOR.get_or_init(|| ErrorMonitor::new())
}