#!/usr/bin/env bash
# 用途：檢查資源使用率（CPU/Memory）

set -euo pipefail

# 顏色定義
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NC='\033[0m'

echo "=========================================="
echo "        K3s 資源使用率"
echo "=========================================="
echo ""

# 節點資源
echo "🖥️  節點資源"
echo "------------------------------------------"
kubectl top nodes 2>/dev/null || echo "需要 metrics-server，請稍後再試"

echo ""
echo "📦 Pod 資源使用 (Top 10)"
echo "------------------------------------------"
kubectl top pods -A --sort-by=cpu 2>/dev/null | head -11 || echo "需要 metrics-server"

echo ""
echo "🔋 資源不足警告 (CPU>80% 或 MEM>1Gi)"
echo "------------------------------------------"
HIGH_PODS=$(kubectl top pods -A 2>/dev/null | awk -v OFS='\t' 'NR>1 {split($4, v, /([0-9]+)/); mem=int(v[2]); if ($3+0 > 80 || mem > 1024) print $0}')

if [ -z "$HIGH_PODS" ]; then
  echo -e "${GREEN}✓ 無高資源使用 Pod${NC}"
else
  echo "$HIGH_PODS" | while IFS=$'\t' read -r ns name cpu mem; do
    echo -e "${YELLOW}⚠ $ns/$name${NC}"
    echo "   CPU: $cpu   Memory: $mem"
  done
fi

echo ""
echo "📊 無資源限制的 Pod"
echo "------------------------------------------"
NO_LIMIT=$(kubectl get pods -A -o jsonpath='{range .items[*]}{.metadata.namespace}{"/"}{.metadata.name}{"\t"}{.spec.containers[*].resources.requests.cpu}{"\t"}{.spec.containers[*].resources.limits.cpu}{"\n"}{end}' | \
  awk -F'\t' '$3 == "<none>" {print $1}')

if [ -z "$NO_LIMIT" ]; then
  echo -e "${GREEN}✓ 所有 Pod 都有資料設定${NC}"
else
  echo "$NO_LIMIT" | while read -r pod; do
    echo -e "${YELLOW}⚠ $pod${NC} - 無資源限制"
  done | head -10
fi

echo ""
echo "=========================================="
