#!/bin/bash
#
# 故障趋势分析脚本
# 用途: 分析历史故障数据，识别趋势
#

ALERT_LOG="/var/log/openclaw-monitor/alerts.log"
REPORT_FILE="/var/log/openclaw/trend-analysis.log"

echo "========================================" >> "$REPORT_FILE"
echo "故障趋势分析报告" >> "$REPORT_FILE"
echo "生成时间: $(date '+%Y-%m-%d %H:%M:%S')" >> "$REPORT_FILE"
echo "========================================" >> "$REPORT_FILE"
echo "" >> "$REPORT_FILE"

# 1. 最近7天统计
echo "【最近7天统计】" >> "$REPORT_FILE"
echo "---------------------------" >> "$REPORT_FILE"
for i in {0..6}; do
    DATE=$(date -d "-$i days" +%Y-%m-%d)
    COUNT=$(grep -c "$DATE" "$ALERT_LOG" 2>/dev/null || echo 0)
    echo "$DATE: $COUNT 条" >> "$REPORT_FILE"
done
echo "" >> "$REPORT_FILE"

# 2. 故障类型分布
echo "【故障类型分布】" >> "$REPORT_FILE"
echo "---------------------------" >> "$REPORT_FILE"
CRITICAL=$(grep -c "CRITICAL" "$ALERT_LOG" 2>/dev/null || echo 0)
ALERT=$(grep -c "ALERT" "$ALERT_LOG" 2>/dev/null || echo 0)
AUTO=$(grep -c "AUTO" "$ALERT_LOG" 2>/dev/null || echo 0)
TOTAL=$((CRITICAL + ALERT + AUTO))

echo "CRITICAL: $CRITICAL ($((CRITICAL * 100 / TOTAL))%)" >> "$REPORT_FILE"
echo "ALERT: $ALERT ($((ALERT * 100 / TOTAL))%)" >> "$REPORT_FILE"
echo "AUTO: $AUTO ($((AUTO * 100 / TOTAL))%)" >> "$REPORT_FILE"
echo "" >> "$REPORT_FILE"

# 3. 趋势判断
echo "【趋势分析】" >> "$REPORT_FILE"
echo "---------------------------" >> "$REPORT_FILE"

# 计算最近3天平均
RECENT_AVG=$(tail -3 "$REPORT_FILE" | grep "条" | awk '{sum+=$2} END {if (NR>0) print sum/NR; else print 0}')
if [ -n "$RECENT_AVG" ]; then
    echo "最近3天平均: $RECENT_AVG 条/天" >> "$REPORT_FILE"
fi

# 趋势判断
LAST_DAY=$(tail -1 "$REPORT_FILE" | grep "条" | awk '{print $2}')
PREV_DAY=$(tail -2 "$REPORT_FILE" | grep "条" | tail -1 | awk '{print $2}')

if [ -n "$LAST_DAY" ] && [ -n "$PREV_DAY" ]; then
    DIFF=$((LAST_DAY - PREV_DAY))
    if [ "$DIFF" -gt 0 ]; then
        echo "趋势: 📈 上升 ($DIFF 条)" >> "$REPORT_FILE"
    elif [ "$DIFF" -lt 0 ]; then
        echo "趋势: 📉 下降 ($((-DIFF)) 条)" >> "$REPORT_FILE"
    else
        echo "趋势: ➡️ 持平" >> "$REPORT_FILE"
    fi
fi
echo "" >> "$REPORT_FILE"

# 4. 建议
echo "【建议】" >> "$REPORT_FILE"
echo "---------------------------" >> "$REPORT_FILE"

# 基于分析给出建议
if [ "$CRITICAL" -gt 100 ]; then
    echo "⚠️ CRITICAL 告警较多，建议检查系统稳定性" >> "$REPORT_FILE"
fi

if [ "$AUTO" -gt 500 ]; then
    echo "ℹ️ AUTO 告警较多，可能是自动恢复机制触发" >> "$REPORT_FILE"
fi

if [ "$LAST_DAY" -gt 100 ]; then
    echo "📊 今日告警较多，建议关注" >> "$REPORT_FILE"
fi

echo "" >> "$REPORT_FILE"
echo "趋势分析完成: $REPORT_FILE"