package service

import (
	"context"
	"testing"
	"time"

	persistencemock "github.com/ocdp/cluster-service/internal/adapter/output/persistence/mock"
	"github.com/ocdp/cluster-service/internal/domain/entity"
	"github.com/ocdp/cluster-service/internal/pkg/authz"
)

func TestListClusterMonitoringAggregatesResourceUsageForAdmin(t *testing.T) {
	ctx := authz.WithPrincipal(context.Background(), &authz.Principal{
		UserID:      "admin-1",
		Username:    "admin",
		Role:        authz.RoleAdmin,
		WorkspaceID: "workspace-admin",
	})
	instanceRepo, userRepo := seedMonitoringOwners(t, ctx)
	svc := NewMonitoringService(
		&monitoringClusterRepo{clusters: []*entity.Cluster{{ID: "cluster-1", Name: "cluster", Visibility: authz.VisibilityGlobalShared}}},
		&stubMetricsClient{allocations: monitoringAllocations()},
		instanceRepo,
		userRepo,
	)

	metrics, err := svc.ListClusterMonitoring(ctx)
	if err != nil {
		t.Fatalf("ListClusterMonitoring returned error: %v", err)
	}
	if len(metrics) != 1 {
		t.Fatalf("expected 1 cluster metric, got %d", len(metrics))
	}
	got := metrics[0]
	if got.AllocatedGPU != 3 || got.AllocatedGPUMemoryMB != 30000 {
		t.Fatalf("expected total GPU/gpumem allocation 3/30000, got %d/%d", got.AllocatedGPU, got.AllocatedGPUMemoryMB)
	}
	if len(got.ResourceUsageByUser) != 2 {
		t.Fatalf("expected 2 user usage rows, got %d: %#v", len(got.ResourceUsageByUser), got.ResourceUsageByUser)
	}
	if got.ResourceUsageByUser[0].Username != "alice" || got.ResourceUsageByUser[0].GPURequests != 1 {
		t.Fatalf("expected alice GPU request row first, got %#v", got.ResourceUsageByUser[0])
	}
	if got.ResourceUsageByUser[1].Username != "bob" || got.ResourceUsageByUser[1].GPURequests != 2 {
		t.Fatalf("expected bob GPU request row second, got %#v", got.ResourceUsageByUser[1])
	}
}

func TestListClusterMonitoringFiltersResourceUsageForOrdinaryUser(t *testing.T) {
	ctx := authz.WithPrincipal(context.Background(), &authz.Principal{
		UserID:      "user-1",
		Username:    "alice",
		Role:        authz.RoleUser,
		WorkspaceID: "workspace-1",
	})
	instanceRepo, userRepo := seedMonitoringOwners(t, ctx)
	svc := NewMonitoringService(
		&monitoringClusterRepo{clusters: []*entity.Cluster{{ID: "cluster-1", Name: "cluster", Visibility: authz.VisibilityGlobalShared}}},
		&stubMetricsClient{allocations: monitoringAllocations()},
		instanceRepo,
		userRepo,
	)

	metrics, err := svc.ListClusterMonitoring(ctx)
	if err != nil {
		t.Fatalf("ListClusterMonitoring returned error: %v", err)
	}
	got := metrics[0]
	if got.AllocatedGPU != 1 || got.AllocatedGPUMemoryMB != 10000 {
		t.Fatalf("expected ordinary user allocation to be scoped to alice, got %d/%d", got.AllocatedGPU, got.AllocatedGPUMemoryMB)
	}
	if len(got.ResourceUsageByUser) != 1 {
		t.Fatalf("expected only alice usage row, got %d: %#v", len(got.ResourceUsageByUser), got.ResourceUsageByUser)
	}
	if got.ResourceUsageByUser[0].UserID != "user-1" || got.ResourceUsageByUser[0].Username != "alice" {
		t.Fatalf("expected alice usage row, got %#v", got.ResourceUsageByUser[0])
	}
	if got.NodeCount != 0 || len(got.Nodes) != 0 || got.TotalCPU != "" || got.TotalMemory != "" {
		t.Fatalf("expected ordinary user cluster-wide metrics to be sanitized, got nodes=%d/%d totalCPU=%q totalMemory=%q", got.NodeCount, len(got.Nodes), got.TotalCPU, got.TotalMemory)
	}
	if got.PodCount != 1 {
		t.Fatalf("expected ordinary user pod count to be self scoped, got %d", got.PodCount)
	}
}

func TestGetNodeMetricsForbiddenForOrdinaryUser(t *testing.T) {
	ctx := authz.WithPrincipal(context.Background(), &authz.Principal{
		UserID:      "user-1",
		Username:    "alice",
		Role:        authz.RoleUser,
		WorkspaceID: "workspace-1",
	})
	svc := NewMonitoringService(
		&monitoringClusterRepo{clusters: []*entity.Cluster{{ID: "cluster-1", Name: "cluster", Visibility: authz.VisibilityGlobalShared}}},
		&stubMetricsClient{allocations: monitoringAllocations()},
		nil,
		nil,
	)

	_, err := svc.GetNodeMetrics(ctx, "cluster-1")
	if err != entity.ErrForbidden {
		t.Fatalf("expected ordinary user node metrics to be forbidden, got %v", err)
	}
}

func seedMonitoringOwners(t *testing.T, ctx context.Context) (*persistencemock.InstanceRepositoryMock, *persistencemock.UserRepositoryMock) {
	t.Helper()
	instanceRepo := persistencemock.NewInstanceRepositoryMock().(*persistencemock.InstanceRepositoryMock)
	userRepo := persistencemock.NewUserRepositoryMock().(*persistencemock.UserRepositoryMock)
	for _, user := range []*entity.User{
		{ID: "user-1", Username: "alice", PasswordHash: "hash", Role: "user", WorkspaceID: "workspace-1"},
		{ID: "user-2", Username: "bob", PasswordHash: "hash", Role: "user", WorkspaceID: "workspace-2"},
	} {
		if err := userRepo.Create(ctx, user); err != nil {
			t.Fatalf("failed to seed user %s: %v", user.ID, err)
		}
	}
	for _, instance := range []*entity.Instance{
		{ID: "inst-1", ClusterID: "cluster-1", Name: "alice-app", Namespace: "ocdp-u-alice", WorkspaceID: "workspace-1", OwnerID: "user-1"},
		{ID: "inst-2", ClusterID: "cluster-1", Name: "bob-app", Namespace: "ocdp-u-bob", WorkspaceID: "workspace-2", OwnerID: "user-2"},
	} {
		if err := instanceRepo.Create(ctx, instance); err != nil {
			t.Fatalf("failed to seed instance %s: %v", instance.ID, err)
		}
	}
	return instanceRepo, userRepo
}

func monitoringAllocations() []*entity.PodResourceAllocation {
	return []*entity.PodResourceAllocation{
		{
			ClusterID:    "cluster-1",
			Namespace:    "ocdp-u-alice",
			PodName:      "alice-app-0",
			InstanceName: "alice-app",
			Allocation: entity.ResourceAllocation{
				CPURequestsMilli:    500,
				CPULimitsMilli:      1000,
				MemoryRequestsBytes: 1024 * 1024 * 1024,
				MemoryLimitsBytes:   2 * 1024 * 1024 * 1024,
				GPURequests:         1,
				GPULimits:           1,
				GPUMemoryRequestsMB: 10000,
				GPUMemoryLimitsMB:   10000,
			},
		},
		{
			ClusterID:    "cluster-1",
			Namespace:    "ocdp-u-bob",
			PodName:      "bob-app-0",
			InstanceName: "bob-app",
			Allocation: entity.ResourceAllocation{
				CPURequestsMilli:    2000,
				CPULimitsMilli:      4000,
				MemoryRequestsBytes: 4 * 1024 * 1024 * 1024,
				MemoryLimitsBytes:   8 * 1024 * 1024 * 1024,
				GPURequests:         2,
				GPULimits:           2,
				GPUMemoryRequestsMB: 20000,
				GPUMemoryLimitsMB:   20000,
			},
		},
	}
}

type monitoringClusterRepo struct {
	clusters []*entity.Cluster
}

func (r *monitoringClusterRepo) Create(ctx context.Context, cluster *entity.Cluster) error {
	r.clusters = append(r.clusters, cluster)
	return nil
}

func (r *monitoringClusterRepo) GetByID(ctx context.Context, id string) (*entity.Cluster, error) {
	for _, cluster := range r.clusters {
		if cluster.ID == id {
			return cluster, nil
		}
	}
	return nil, entity.ErrClusterNotFound
}

func (r *monitoringClusterRepo) GetByName(ctx context.Context, name string) (*entity.Cluster, error) {
	for _, cluster := range r.clusters {
		if cluster.Name == name {
			return cluster, nil
		}
	}
	return nil, entity.ErrClusterNotFound
}

func (r *monitoringClusterRepo) Update(ctx context.Context, cluster *entity.Cluster) error {
	return nil
}

func (r *monitoringClusterRepo) Delete(ctx context.Context, id string) error { return nil }

func (r *monitoringClusterRepo) List(ctx context.Context) ([]*entity.Cluster, error) {
	return r.clusters, nil
}

type stubMetricsClient struct {
	allocations []*entity.PodResourceAllocation
}

func (c *stubMetricsClient) GetClusterMetrics(ctx context.Context, clusterID string) (*entity.ClusterMetrics, error) {
	return &entity.ClusterMetrics{
		ClusterID:   clusterID,
		ClusterName: "cluster",
		Status:      "healthy",
		NodeCount:   3,
		PodCount:    99,
		TotalCPU:    "48 cores",
		TotalMemory: "256Gi",
		Nodes:       []entity.NodeMetrics{{NodeName: "node-a"}},
		LastCheck:   time.Now(),
	}, nil
}

func (c *stubMetricsClient) GetNodeMetrics(ctx context.Context, clusterID string) ([]*entity.NodeMetrics, error) {
	return nil, nil
}

func (c *stubMetricsClient) GetPodResourceAllocations(ctx context.Context, clusterID string) ([]*entity.PodResourceAllocation, error) {
	return c.allocations, nil
}