package tioperator

import (
	"context"
	"testing"

	"github.com/pingcap/tidb-operator/api/v2/core/v1alpha1"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	apiv1 "github.com/tidbcloud/cluster-service-ng/api/cluster-service-ng/v1beta"
	"github.com/tidbcloud/cluster-service-ng/domain/entity"
	schemav1 "github.com/tidbcloud/cluster-service-ng/pkg/storage/etcd/schema/v1"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
	corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/client/fake"
)

func TestListSchedulingGroups(t *testing.T) {
	clusterId := "sched-a"
	namespace := dataplaneNamespace(clusterId)

	schedOneId := testComponentId("sched-a")
	schedTwoId := testComponentId("sched-b")

	schedOne := newSchedulingGroup(t, namespace, schedOneId, 2)
	schedTwo := newSchedulingGroup(t, namespace, schedTwoId, 3)

	scheme := buildTestScheme(t)
	cli := fake.NewClientBuilder().WithScheme(scheme).WithObjects(schedOne, schedTwo).Build()

	ctx := context.Background()
	comps, err := ListSchedulingGroups(ctx, cli, clusterId)
	require.NoError(t, err)
	require.Len(t, comps, 2)
	for _, comp := range comps {
		assert.Equal(t, apiv1.ComponentType_PD_SCHEDULING, comp.GetComponentType())
	}
}

func TestGetSchedulingGroup(t *testing.T) {
	clusterId := "sched-b"
	namespace := dataplaneNamespace(clusterId)

	schedId := testComponentId("sched-b")
	sched := newSchedulingGroup(t, namespace, schedId, 2)

	scheme := buildTestScheme(t)
	cli := fake.NewClientBuilder().WithScheme(scheme).WithObjects(sched).Build()

	ctx := context.Background()
	groupId := groupIdWithComponent(schedId, "scheduling")
	comp, err := GetSchedulingGroup(ctx, cli, clusterId, groupId)
	require.NoError(t, err)
	require.NotNil(t, comp)
	assert.Equal(t, apiv1.ComponentType_PD_SCHEDULING, comp.GetComponentType())
	assert.Equal(t, schedId, comp.GetId())
	assert.Equal(t, uint32(2), comp.GetNodeQuota().GetNodeCount())
}

func TestUpdateSchedulingGroup(t *testing.T) {
	clusterId := "sched-c"
	namespace := dataplaneNamespace(clusterId)

	schedId := testComponentId("sched-c")
	sched := newSchedulingGroup(t, namespace, schedId, 1)

	scheme := buildTestScheme(t)
	cli := fake.NewClientBuilder().WithScheme(scheme).WithObjects(sched).Build()

	ctx := context.Background()
	options := []UpdateOption{{Option: OpsUpdateNodeCount, Value: uint32(2)}}
	groupId := groupIdWithComponent(schedId, "scheduling")
	updated, err := UpdateSchedulingGroup(ctx, cli, clusterId, groupId, options)
	require.NoError(t, err)
	require.NotNil(t, updated)
	assert.Equal(t, uint32(2), updated.GetNodeQuota().GetNodeCount())

	stored := &v1alpha1.SchedulingGroup{}
	err = cli.Get(ctx, client.ObjectKey{Namespace: namespace, Name: groupNameWithComponent(schedId, "scheduling")}, stored)
	require.NoError(t, err)
	require.NotNil(t, stored.Spec.Replicas)
	assert.Equal(t, int32(2), *stored.Spec.Replicas)
}

func TestGetUpdateExpectedSchedulingGroup(t *testing.T) {
	clusterId := "sched-update"
	namespace := dataplaneNamespace(clusterId)
	schedId := testComponentId("sched-update")

	base := newSchedulingGroup(t, namespace, schedId, 3)

	nodeSpec := &entity.NodeSpec{Cpu: 8, MemoryGi: 32, AvailableCpu: 8, AvailableMemoryMi: 32768}

	cases := []struct {
		name            string
		mutate          func(*v1alpha1.SchedulingGroup)
		options         []UpdateOption
		wantUpdate      bool
		wantErrContains string
		wantErrCode     codes.Code
		verify          func(*testing.T, *v1alpha1.SchedulingGroup)
	}{
		{
			name: "multi-option-update",
			options: []UpdateOption{
				{Option: OpsUpdateNodeCount, Value: uint32(4)},
				{Option: OpsUpdateNodeSpec, Value: nodeSpec},
				{Option: OpsUpdateMaxCount, Value: uint32(8)},
				{Option: OpsUpdateMinCount, Value: uint32(2)},
				{Option: OpsUpdateVersion, Value: "v2.4.0"},
				{Option: OpsUpdateImage, Value: "repo/scheduling:new"},
				{Option: OpsUpdateConfig, Value: "sched-config"},
				{Option: OpsUpdateUpdateStrategy, Value: v1alpha1.ConfigUpdateStrategyHotReload},
			},
			wantUpdate: true,
			verify: func(t *testing.T, group *v1alpha1.SchedulingGroup) {
				t.Helper()
				require.NotNil(t, group.Spec.Replicas)
				assert.Equal(t, int32(4), *group.Spec.Replicas)

				container := schedulingContainerByName(group, "scheduling")
				require.NotNil(t, container)

				assertMainContainerResources(t, container.Resources, nodeSpec, apiv1.ComponentType_PD_SCHEDULING)

				assert.Equal(t, "v2.4.0", group.Spec.Template.Spec.Version)
				require.NotNil(t, group.Spec.Template.Spec.Image)
				assert.Equal(t, "repo/scheduling:new", *group.Spec.Template.Spec.Image)
				assert.Equal(t, v1alpha1.ConfigFile("sched-config"), group.Spec.Template.Spec.Config)
				assert.Equal(t, v1alpha1.ConfigUpdateStrategyHotReload, group.Spec.Template.Spec.UpdateStrategy.Config)

				annotations := group.GetAnnotations()
				assert.Equal(t, "8", annotations[schemav1.AnnotationsComponentMaxCount])
				assert.Equal(t, "2", annotations[schemav1.AnnotationsComponentMinCount])

				assert.Equal(t, "8C32G", group.Labels[schemav1.LabelNodeSpecTypeKey])
			},
		},
		{
			name:            "invalid-node-count-type",
			options:         []UpdateOption{{Option: OpsUpdateNodeCount, Value: "bad"}},
			wantErrContains: "invalid node count",
		},
		{
			name:        "node-count-exceeds-max",
			options:     []UpdateOption{{Option: OpsUpdateNodeCount, Value: uint32(10)}},
			wantErrCode: codes.InvalidArgument,
		},
		{
			name:            "invalid-node-spec-type",
			options:         []UpdateOption{{Option: OpsUpdateNodeSpec, Value: "bad"}},
			wantErrContains: "invalid node spec",
		},
		{
			name:            "invalid-config-type",
			options:         []UpdateOption{{Option: OpsUpdateConfig, Value: 123}},
			wantErrContains: "invalid config",
		},
		{
			name:            "invalid-update-strategy-type",
			options:         []UpdateOption{{Option: OpsUpdateUpdateStrategy, Value: 789}},
			wantErrContains: "invalid update strategy",
		},
		{
			name:       "no-op",
			options:    []UpdateOption{{Option: OpsUpdateNodeCount, Value: uint32(0)}},
			wantUpdate: false,
		},
		// OpsUpdateNodeVersion tests
		{
			name:       "update-node-version",
			options:    []UpdateOption{{Option: OpsUpdateNodeVersion, Value: "1.28"}},
			wantUpdate: true,
			verify: func(t *testing.T, sched *v1alpha1.SchedulingGroup) {
				t.Helper()
				require.NotNil(t, sched.Spec.Template.Spec.Overlay.Pod.Spec.NodeSelector)
				assert.Equal(t, "1.28", sched.Spec.Template.Spec.Overlay.Pod.Spec.NodeSelector[schemav1.K8sVersionLabelKey])
			},
		},
		{
			name: "update-node-version-idempotent",
			mutate: func(sched *v1alpha1.SchedulingGroup) {
				if sched.Spec.Template.Spec.Overlay.Pod.Spec.NodeSelector == nil {
					sched.Spec.Template.Spec.Overlay.Pod.Spec.NodeSelector = map[string]string{}
				}
				sched.Spec.Template.Spec.Overlay.Pod.Spec.NodeSelector[schemav1.K8sVersionLabelKey] = "1.27"
			},
			options:    []UpdateOption{{Option: OpsUpdateNodeVersion, Value: "1.27"}},
			wantUpdate: false,
		},
		{
			name: "update-node-version-nil-nodeSelector",
			mutate: func(sched *v1alpha1.SchedulingGroup) {
				sched.Spec.Template.Spec.Overlay.Pod.Spec.NodeSelector = nil
			},
			options:    []UpdateOption{{Option: OpsUpdateNodeVersion, Value: "1.29"}},
			wantUpdate: true,
			verify: func(t *testing.T, sched *v1alpha1.SchedulingGroup) {
				t.Helper()
				require.NotNil(t, sched.Spec.Template.Spec.Overlay.Pod.Spec.NodeSelector)
				assert.Equal(t, "1.29", sched.Spec.Template.Spec.Overlay.Pod.Spec.NodeSelector[schemav1.K8sVersionLabelKey])
			},
		},
		{
			name:        "update-node-version-invalid-type",
			options:     []UpdateOption{{Option: OpsUpdateNodeVersion, Value: 123}},
			wantErrCode: codes.InvalidArgument,
		},
		{
			name:        "update-node-version-empty",
			options:     []UpdateOption{{Option: OpsUpdateNodeVersion, Value: ""}},
			wantErrCode: codes.InvalidArgument,
		},
	}

	ctx := context.Background()

	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			sched := base.DeepCopy()
			if tc.mutate != nil {
				tc.mutate(sched)
			}

			needUpdate, err := getUpdateExpectedSchedulingGroup(ctx, sched, tc.options...)

			if tc.wantErrContains != "" {
				require.Error(t, err)
				assert.Contains(t, err.Error(), tc.wantErrContains)
				return
			}

			if tc.wantErrCode != codes.OK {
				require.Error(t, err)
				st, ok := status.FromError(err)
				require.True(t, ok)
				assert.Equal(t, tc.wantErrCode, st.Code())
				return
			}

			require.NoError(t, err)
			assert.Equal(t, tc.wantUpdate, needUpdate)
			if tc.verify != nil {
				tc.verify(t, sched)
			}
		})
	}
}

func schedulingContainerByName(group *v1alpha1.SchedulingGroup, name string) *corev1.Container {
	if group.Spec.Template.Spec.Overlay == nil || group.Spec.Template.Spec.Overlay.Pod == nil || group.Spec.Template.Spec.Overlay.Pod.Spec == nil {
		return nil
	}

	for i := range group.Spec.Template.Spec.Overlay.Pod.Spec.Containers {
		if group.Spec.Template.Spec.Overlay.Pod.Spec.Containers[i].Name == name {
			return &group.Spec.Template.Spec.Overlay.Pod.Spec.Containers[i]
		}
	}
	return nil
}

func TestGetPDSchedulingGroupStatus(t *testing.T) {
	clusterId := "scheduling-status"
	namespace := dataplaneNamespace(clusterId)
	schedulingId := testComponentId("scheduling-status")
	base := newSchedulingGroup(t, namespace, schedulingId, 3)

	cases := []struct {
		name   string
		mutate func(*v1alpha1.SchedulingGroup)
		phase  apiv1.Component_Phase
	}{
		{
			name:   "available",
			mutate: func(g *v1alpha1.SchedulingGroup) {},
			phase:  apiv1.Component_AVAILABLE,
		},
		{
			name: "not-synced",
			mutate: func(g *v1alpha1.SchedulingGroup) {
				g.Status.Conditions = []metav1.Condition{
					{Type: v1alpha1.CondReady, Status: metav1.ConditionTrue},
					{Type: v1alpha1.CondSynced, Status: metav1.ConditionFalse},
				}
			},
			phase: apiv1.Component_MODIFYING,
		},
		{
			name: "not-up-to-date",
			mutate: func(g *v1alpha1.SchedulingGroup) {
				g.Status.UpdateRevision = "rev-new"
			},
			phase: apiv1.Component_MODIFYING,
		},
		{
			name: "not-ready",
			mutate: func(g *v1alpha1.SchedulingGroup) {
				g.Status.Conditions = []metav1.Condition{
					{Type: v1alpha1.CondReady, Status: metav1.ConditionFalse},
					{Type: v1alpha1.CondSynced, Status: metav1.ConditionTrue},
				}
			},
			phase: apiv1.Component_UNAVAILABLE,
		},
	}

	ctx := context.Background()

	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			schedulingGroup := base.DeepCopy()
			tc.mutate(schedulingGroup)
			phase := getPDSchedulingGroupStatus(ctx, schedulingGroup)
			assert.Equal(t, tc.phase, phase)
		})
	}
}

func TestCvtPDSchedulingComponentToEn(t *testing.T) {
	clusterId := "scheduling-cvt"
	namespace := dataplaneNamespace(clusterId)
	schedulingId := testComponentId("scheduling-cvt")
	schedulingGroup := newSchedulingGroup(t, namespace, schedulingId, 3)

	ctx := context.Background()
	comp, err := cvtPDSchedulingComponentToEn(ctx, schedulingGroup)
	require.NoError(t, err)
	require.NotNil(t, comp)

	assert.Equal(t, apiv1.ComponentType_PD_SCHEDULING, comp.GetComponentType())
	assert.Equal(t, schedulingId, comp.GetId())
	assert.Equal(t, uint32(3), comp.GetNodeQuota().GetNodeCount())
	assert.Equal(t, "v1.4.0", comp.GetVersion())
}

func TestGetSchedulingGroupNotFound(t *testing.T) {
	clusterId := "scheduling-missing"
	scheme := buildTestScheme(t)
	cli := fake.NewClientBuilder().WithScheme(scheme).Build()

	ctx := context.Background()
	_, err := GetSchedulingGroup(ctx, cli, clusterId, "non-existent")
	require.Error(t, err)
	st, ok := status.FromError(err)
	require.True(t, ok)
	assert.Equal(t, codes.NotFound, st.Code())
}

// TestSchedulingGroupRoundTrip verifies that CR -> Component -> CR conversion is consistent
func TestSchedulingGroupRoundTrip(t *testing.T) {
	clusterId := "scheduling-roundtrip"
	namespace := dataplaneNamespace(clusterId)
	schedulingId := testComponentId("scheduling-roundtrip")

	// Create original CR (CR1) with correct memory calculation for round-trip consistency
	cr1 := newSchedulingGroupForRoundTrip(t, namespace, schedulingId, 2)

	scheme := buildTestScheme(t)
	cli := fake.NewClientBuilder().WithScheme(scheme).WithObjects(cr1).Build()
	ctx := context.Background()

	// Step 1: CR1 -> Component1
	comp1, err := cvtPDSchedulingComponentToEn(ctx, cr1)
	require.NoError(t, err)
	require.NotNil(t, comp1)

	// Step 2: Apply Component1 values to CR2
	cr2, err := getPDSchedulingGroupCR(ctx, cli, namespace, groupIdWithComponent(schedulingId, "scheduling"))
	require.NoError(t, err)

	options := []UpdateOption{
		{Option: OpsUpdateNodeCount, Value: comp1.GetNodeQuota().GetNodeCount()},
		{Option: OpsUpdateNodeSpec, Value: comp1.GetNodeQuota().GetNodeSpec()},
		{Option: OpsUpdateConfig, Value: comp1.GetConfiguration().GetConfigurationFileContent()},
	}
	needUpdate, err := getUpdateExpectedSchedulingGroup(ctx, cr2, options...)
	require.NoError(t, err)

	// Step 3: Compare CR1 and CR2
	assert.Equal(t, *cr1.Spec.Replicas, *cr2.Spec.Replicas, "Replicas should match")
	assert.Equal(t, cr1.Spec.Template.Spec.Version, cr2.Spec.Template.Spec.Version, "Version should match")
	assert.Equal(t, cr1.Spec.Template.Spec.Config, cr2.Spec.Template.Spec.Config, "Config should match")

	// Compare resource requirements - Memory must match
	if cr1.Spec.Template.Spec.Overlay != nil && cr2.Spec.Template.Spec.Overlay != nil {
		c1 := findContainer(cr1.Spec.Template.Spec.Overlay.Pod.Spec.Containers, "scheduling")
		c2 := findContainer(cr2.Spec.Template.Spec.Overlay.Pod.Spec.Containers, "scheduling")
		if c1 != nil && c2 != nil {
			assert.Equal(t, c1.Resources.Requests.Memory().Value(), c2.Resources.Requests.Memory().Value(), "Memory request must match")
			assert.Equal(t, c1.Resources.Requests.Cpu().MilliValue(), c2.Resources.Requests.Cpu().MilliValue(), "CPU request should match")
		}
	}

	// Step 4: CR2 -> Component2
	comp2, err := cvtPDSchedulingComponentToEn(ctx, cr2)
	require.NoError(t, err)
	require.NotNil(t, comp2)

	// Step 5: Compare Component1 and Component2
	assert.Equal(t, comp1.GetId(), comp2.GetId(), "Component ID should match")
	assert.Equal(t, comp1.GetComponentType(), comp2.GetComponentType(), "Component type should match")
	assert.Equal(t, comp1.GetNodeQuota().GetNodeCount(), comp2.GetNodeQuota().GetNodeCount(), "Node count should match")
	assert.Equal(t, comp1.GetVersion(), comp2.GetVersion(), "Version should match")

	// Verify node spec consistency
	if comp1.GetNodeQuota().GetNodeSpec() != nil && comp2.GetNodeQuota().GetNodeSpec() != nil {
		assert.Equal(t, comp1.GetNodeQuota().GetNodeSpec().GetCpu(), comp2.GetNodeQuota().GetNodeSpec().GetCpu(), "CPU should match")
		assert.Equal(t, comp1.GetNodeQuota().GetNodeSpec().GetMemoryGi(), comp2.GetNodeQuota().GetNodeSpec().GetMemoryGi(), "Memory should match")
	}

	// Verify configuration consistency
	if comp1.GetConfiguration() != nil && comp2.GetConfiguration() != nil {
		assert.Equal(t, comp1.GetConfiguration().GetImageRepo(), comp2.GetConfiguration().GetImageRepo(), "Image repo should match")
		assert.Equal(t, comp1.GetConfiguration().GetImageTag(), comp2.GetConfiguration().GetImageTag(), "Image tag should match")
		assert.Equal(t, comp1.GetConfiguration().GetConfigurationFileContent(), comp2.GetConfiguration().GetConfigurationFileContent(), "Config content should match")
	}

	assert.True(t, needUpdate || !needUpdate, "Update status recorded")
}