#!/usr/bin/env bash
# 用途：檢查 K3s 叢集節點狀態

set -euo pipefail

# 顏色定義
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
NC='\033[0m' # No Color

echo "=========================================="
echo "        K3s 叢集節點狀態"
echo "=========================================="
echo ""

# 取得節點資訊
NODES=$(kubectl get nodes --no-headers)

# 統計
NODE_TOTAL=$(echo "$NODES" | wc -l)
NODE_READY=$(echo "$NODES" | grep -c " Ready " || true)
NODE_NOT_READY=$(echo "$NODES" | grep -v " Ready " | wc -l)

echo "📊 叢集概況"
echo "------------------------------------------"
echo "總節點數: $NODE_TOTAL"
echo -e "  ${GREEN}Ready:     $NODE_READY${NC}"
if [ $NODE_NOT_READY -gt 0 ]; then
  echo -e "  ${RED}NotReady:  $NODE_NOT_READY${NC}"
fi
echo ""

# 顯示每個節點的詳細資訊
echo "🖥️  節點詳細資訊"
echo "------------------------------------------"

while read -r name status roles age version internal_ip os kernel runtime; do
  # 顏色判斷
  if [[ "$status" == "Ready"* ]]; then
    STATUS_COLOR="$GREEN"
    ICON="✓"
  else
    STATUS_COLOR="$RED"
    ICON="✗"
  fi

  # 角色簡化
  if [[ "$roles" == *"control-plane"* ]]; then
    ROLE="${BLUE}[master]${NC}"
  elif [[ "$roles" == "<none>" ]]; then
    ROLE="[worker]"
  else
    ROLE="$roles"
  fi

  # 輸出
  echo -e "${STATUS_COLOR}$ICON $name${NC} $ROLE"
  echo "   狀態: $status"
  echo "   IP:   $internal_ip"
  echo "   OS:   $os $kernel"
  echo ""
done <<< "$NODES"

# Pod 分佈
echo "📦 Pod 分佈"
echo "------------------------------------------"
kubectl get pods -A -o jsonpath='{range .items[*]}{.metadata.namespace}{"\t"}{.metadata.name}{"\t"}{.spec.nodeName}{"\n"}' | awk '{print $1, $2, "→", $3}' | column -t | head -20

POD_TOTAL=$(kubectl get pods -A --no-headers | wc -l)
echo "..."
echo "總 Pod 數: $POD_TOTAL"
echo ""

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