package k8s

import (
	"context"
	"testing"

	corev1 "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/api/resource"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/client-go/kubernetes/fake"
)

func TestGetClusterStatus_Nodes(t *testing.T) {
	cs := fake.NewSimpleClientset(
		&corev1.Node{
			ObjectMeta: metav1.ObjectMeta{Name: "node-1"},
			Status: corev1.NodeStatus{
				Conditions: []corev1.NodeCondition{
					{Type: corev1.NodeReady, Status: corev1.ConditionTrue},
				},
				Capacity: corev1.ResourceList{
					corev1.ResourceCPU:    resource.MustParse("8"),
					corev1.ResourceMemory: resource.MustParse("32Gi"),
				},
				Allocatable: corev1.ResourceList{
					corev1.ResourceCPU:    resource.MustParse("7800m"),
					corev1.ResourceMemory: resource.MustParse("30Gi"),
				},
			},
		},
		&corev1.Node{
			ObjectMeta: metav1.ObjectMeta{Name: "node-2"},
			Status: corev1.NodeStatus{
				Conditions: []corev1.NodeCondition{
					{Type: corev1.NodeReady, Status: corev1.ConditionFalse},
				},
				Capacity: corev1.ResourceList{
					corev1.ResourceCPU:    resource.MustParse("4"),
					corev1.ResourceMemory: resource.MustParse("16Gi"),
				},
				Allocatable: corev1.ResourceList{
					corev1.ResourceCPU:    resource.MustParse("3800m"),
					corev1.ResourceMemory: resource.MustParse("14Gi"),
				},
			},
		},
	)
	client := NewClientWithClientset(cs, nil, Config{})

	status, err := client.GetClusterStatus(context.Background())
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	if len(status.Nodes) != 2 {
		t.Fatalf("expected 2 nodes, got %d", len(status.Nodes))
	}

	n1 := status.Nodes[0]
	if n1.Name != "node-1" {
		t.Fatalf("expected node-1, got %s", n1.Name)
	}
	if n1.Status != "Ready" {
		t.Fatalf("expected Ready, got %s", n1.Status)
	}
	if n1.CPUCapacity != "8" {
		t.Fatalf("expected CPU capacity 8, got %s", n1.CPUCapacity)
	}

	n2 := status.Nodes[1]
	if n2.Status != "NotReady" {
		t.Fatalf("expected NotReady, got %s", n2.Status)
	}

	// Check totals: 8 + 4 = 12 CPU, 7800m + 3800m = 11600m allocatable
	if status.Total.CPUCapacity != "12" {
		t.Fatalf("expected total CPU capacity 12, got %s", status.Total.CPUCapacity)
	}
}

func TestGetClusterStatus_EmptyCluster(t *testing.T) {
	cs := fake.NewSimpleClientset()
	client := NewClientWithClientset(cs, nil, Config{})

	status, err := client.GetClusterStatus(context.Background())
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	if len(status.Nodes) != 0 {
		t.Fatalf("expected 0 nodes, got %d", len(status.Nodes))
	}
}

func TestGetClusterStatus_NodeWithNoReadyCondition(t *testing.T) {
	cs := fake.NewSimpleClientset(
		&corev1.Node{
			ObjectMeta: metav1.ObjectMeta{Name: "node-unknown"},
			Status: corev1.NodeStatus{
				Conditions: []corev1.NodeCondition{
					{Type: corev1.NodeMemoryPressure, Status: corev1.ConditionFalse},
				},
				Capacity: corev1.ResourceList{
					corev1.ResourceCPU:    resource.MustParse("4"),
					corev1.ResourceMemory: resource.MustParse("8Gi"),
				},
				Allocatable: corev1.ResourceList{
					corev1.ResourceCPU:    resource.MustParse("4"),
					corev1.ResourceMemory: resource.MustParse("8Gi"),
				},
			},
		},
	)
	client := NewClientWithClientset(cs, nil, Config{})

	status, err := client.GetClusterStatus(context.Background())
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	if status.Nodes[0].Status != "Unknown" {
		t.Fatalf("expected Unknown, got %s", status.Nodes[0].Status)
	}
}

func TestGetCacheStats_AllBound(t *testing.T) {
	cs := fake.NewSimpleClientset(
		&corev1.PersistentVolumeClaim{
			ObjectMeta: metav1.ObjectMeta{Name: "verdaccio-storage", Namespace: "dev-infra"},
			Status: corev1.PersistentVolumeClaimStatus{
				Phase:    corev1.ClaimBound,
				Capacity: corev1.ResourceList{corev1.ResourceStorage: resource.MustParse("10Gi")},
			},
		},
		&corev1.PersistentVolumeClaim{
			ObjectMeta: metav1.ObjectMeta{Name: "athens-storage", Namespace: "dev-infra"},
			Status: corev1.PersistentVolumeClaimStatus{
				Phase:    corev1.ClaimBound,
				Capacity: corev1.ResourceList{corev1.ResourceStorage: resource.MustParse("10Gi")},
			},
		},
		&corev1.PersistentVolumeClaim{
			ObjectMeta: metav1.ObjectMeta{Name: "cargo-proxy-cache", Namespace: "dev-infra"},
			Status: corev1.PersistentVolumeClaimStatus{
				Phase:    corev1.ClaimBound,
				Capacity: corev1.ResourceList{corev1.ResourceStorage: resource.MustParse("10Gi")},
			},
		},
	)
	client := NewClientWithClientset(cs, nil, Config{})

	stats, err := client.GetCacheStats(context.Background())
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	if len(stats) != 3 {
		t.Fatalf("expected 3 cache stats, got %d", len(stats))
	}

	for _, s := range stats {
		if s.Status != "Bound" {
			t.Fatalf("expected Bound for %s, got %s", s.Name, s.Status)
		}
		if s.Capacity != "10Gi" {
			t.Fatalf("expected 10Gi capacity for %s, got %s", s.Name, s.Capacity)
		}
	}
}

func TestGetCacheStats_MissingPVC(t *testing.T) {
	// Only verdaccio exists
	cs := fake.NewSimpleClientset(
		&corev1.PersistentVolumeClaim{
			ObjectMeta: metav1.ObjectMeta{Name: "verdaccio-storage", Namespace: "dev-infra"},
			Status: corev1.PersistentVolumeClaimStatus{
				Phase:    corev1.ClaimBound,
				Capacity: corev1.ResourceList{corev1.ResourceStorage: resource.MustParse("10Gi")},
			},
		},
	)
	client := NewClientWithClientset(cs, nil, Config{})

	stats, err := client.GetCacheStats(context.Background())
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	if len(stats) != 3 {
		t.Fatalf("expected 3 entries, got %d", len(stats))
	}

	for _, s := range stats {
		switch s.Name {
		case "verdaccio":
			if s.Status != "Bound" {
				t.Fatalf("expected Bound for verdaccio, got %s", s.Status)
			}
		case "athens", "cargo-proxy":
			if s.Status != "NotFound" {
				t.Fatalf("expected NotFound for %s, got %s", s.Name, s.Status)
			}
		}
	}
}

func TestGetCacheStats_EmptyCluster(t *testing.T) {
	cs := fake.NewSimpleClientset()
	client := NewClientWithClientset(cs, nil, Config{})

	stats, err := client.GetCacheStats(context.Background())
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	if len(stats) != 3 {
		t.Fatalf("expected 3 entries, got %d", len(stats))
	}
	for _, s := range stats {
		if s.Status != "NotFound" {
			t.Fatalf("expected NotFound for %s, got %s", s.Name, s.Status)
		}
	}
}