package handlers

import (
	"time"

	"ezops/internal/models"

	"github.com/gin-gonic/gin"
)

func (h *KubernetesHandler) GetMultiClusterComparison(c *gin.Context) {
	// 1. 获取所有集群
	var clusters []models.KubernetesCluster
	h.db.Find(&clusters)

	type ClusterComparison struct {
		ID             uint    `json:"id"`
		Name           string  `json:"name"`
		Code           string  `json:"code"`
		Status         string  `json:"status"`
		Version        string  `json:"version"`
		NodeCount      int     `json:"node_count"`
		PodCount       int     `json:"pod_count"`
		DeploymentCount int    `json:"deployment_count"`
		ServiceCount   int     `json:"service_count"`
		CPUUsage       float64 `json:"cpu_usage"`
		MemoryUsage    float64 `json:"memory_usage"`
		APIServer      string  `json:"api_server"`
		LastSyncAt     *time.Time `json:"last_sync_at"`

		// Node-level aggregated data from kubernetes_nodes table
		TotalCPUCores  int     `json:"total_cpu_cores"`
		TotalMemoryMB  int64   `json:"total_memory_mb"`
		MasterCount    int     `json:"master_count"`
		WorkerCount    int     `json:"worker_count"`
		HealthyNodes   int     `json:"healthy_nodes"`
		UnhealthyNodes int     `json:"unhealthy_nodes"`
	}

	// 2. 获取所有节点的聚合数据（按 cluster_id 分组）
	type NodeAgg struct {
		ClusterID      uint
		NodeCount      int
		MasterCount    int
		WorkerCount    int
		HealthyNodes   int
		UnhealthyNodes int
		TotalCPU       int
		TotalMemory    int64
		AvgCPUUsage    float64
		AvgMemUsage    float64
	}
	nodeAggMap := map[uint]*NodeAgg{}
	{
		var nodes []models.KubernetesNode
		h.db.Find(&nodes)
		for _, n := range nodes {
			agg, ok := nodeAggMap[n.ClusterID]
			if !ok {
				agg = &NodeAgg{ClusterID: n.ClusterID}
				nodeAggMap[n.ClusterID] = agg
			}
			agg.NodeCount++
			agg.TotalCPU += n.CPU
			agg.TotalMemory += n.Memory
			if n.CPUUsage > 0 || n.MemoryUsage > 0 {
				if agg.AvgCPUUsage == 0 { agg.AvgCPUUsage = n.CPUUsage } else { agg.AvgCPUUsage = (agg.AvgCPUUsage*float64(agg.NodeCount-1) + n.CPUUsage) / float64(agg.NodeCount) }
				if agg.AvgMemUsage == 0 { agg.AvgMemUsage = n.MemoryUsage } else { agg.AvgMemUsage = (agg.AvgMemUsage*float64(agg.NodeCount-1) + n.MemoryUsage) / float64(agg.NodeCount) }
			}
			if n.Role == "master" {
				agg.MasterCount++
			} else {
				agg.WorkerCount++
			}
			if n.Status == "Ready" {
				agg.HealthyNodes++
			} else {
				agg.UnhealthyNodes++
			}
		}
	}

	// 3. 构建对比数据
	comparisons := []ClusterComparison{}
	totalNodes, totalPods, totalDeployments, totalServices := 0, 0, 0, 0
	for _, cl := range clusters {
		cc := ClusterComparison{
			ID:              cl.ID,
			Name:            cl.Name,
			Code:            cl.Code,
			Status:          cl.Status,
			Version:         cl.Version,
			NodeCount:       cl.NodeCount,
			PodCount:        cl.PodCount,
			DeploymentCount: cl.DeploymentCount,
			ServiceCount:    cl.ServiceCount,
			CPUUsage:        cl.CPUUsage,
			MemoryUsage:     cl.MemoryUsage,
			APIServer:       cl.APIServer,
			LastSyncAt:      cl.LastSyncAt,
		}
		// 优先用 node 级别的实时聚合数据
		if agg, ok := nodeAggMap[cl.ID]; ok && agg.NodeCount > 0 {
			cc.TotalCPUCores = agg.TotalCPU
			cc.TotalMemoryMB = agg.TotalMemory
			cc.MasterCount = agg.MasterCount
			cc.WorkerCount = agg.WorkerCount
			cc.HealthyNodes = agg.HealthyNodes
			cc.UnhealthyNodes = agg.UnhealthyNodes
			// 如果集群级别的 cpu_usage 为 0，使用节点平均值
			if cc.CPUUsage == 0 && agg.AvgCPUUsage > 0 {
				cc.CPUUsage = agg.AvgCPUUsage
			}
			if cc.MemoryUsage == 0 && agg.AvgMemUsage > 0 {
				cc.MemoryUsage = agg.AvgMemUsage
			}
		}
		totalNodes += cc.NodeCount
		totalPods += cc.PodCount
		totalDeployments += cc.DeploymentCount
		totalServices += cc.ServiceCount
		comparisons = append(comparisons, cc)
	}

	// 4. 返回结果
	c.JSON(200, models.Response{
		Code:    200,
		Message: "success",
		Data: gin.H{
			"clusters": comparisons,
			"totals": gin.H{
				"cluster_count":    len(clusters),
				"node_count":       totalNodes,
				"pod_count":        totalPods,
				"deployment_count": totalDeployments,
				"service_count":    totalServices,
			},
		},
	})
}

// ============================================================================
// RBAC — ServiceAccount / Role / RoleBinding (code-based)
// ============================================================================

// ListServiceAccountsNS lists ServiceAccounts in a namespace