package server

import (
	"context"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/mock"
	"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"
	bractionmocks "github.com/tidbcloud/cluster-service-ng/domain/workflow/action/br/mocks"
	"github.com/tidbcloud/cluster-service-ng/domain/workflow/dag"
	clustergatewaymocks "github.com/tidbcloud/cluster-service-ng/pkg/clustergateway/mocks"
	dataplanemocks "github.com/tidbcloud/cluster-service-ng/pkg/dataplanemgr/mocks"
	"github.com/tidbcloud/cluster-service-ng/pkg/runtime/executor"
	executormocks "github.com/tidbcloud/cluster-service-ng/pkg/runtime/executor/mocks"
	repomnocks "github.com/tidbcloud/cluster-service-ng/pkg/storage/repo/mocks"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
)

func TestDeleteTiDBGroup(t *testing.T) {
	tests := []struct {
		name          string
		tidbClusterId string
		tidbGroupId   string
		setupMocks    func(*repomnocks.TiDBGroupRepo, *repomnocks.SharedPoolRepo, *repomnocks.LockRepo, *executormocks.RemoteExecutor, *bractionmocks.ScaleManager)
		expectedError string
		expectedCode  codes.Code
		validate      func(*testing.T, *entity.TiDBGroup, error)
	}{
		{
			name:          "successful delete tidb group",
			tidbClusterId: "testcluster",
			tidbGroupId:   "testgroup",
			setupMocks: func(tidbGroupRepo *repomnocks.TiDBGroupRepo, sharedPoolRepo *repomnocks.SharedPoolRepo, lockRepo *repomnocks.LockRepo, dagExecutor *executormocks.RemoteExecutor, scaleManager *bractionmocks.ScaleManager) {
				// Mock tidb group load
				tidbGroup := &entity.TiDBGroup{
					TiDBGroup: apiv1.TiDBGroup{
						Id:           "testgroup",
						ClusterId:    "testcluster",
						SharedPoolId: "testsharedpool",
						Phase:        apiv1.TiDBGroup_AVAILABLE,
					},
				}
				tidbGroupRepo.On("Load", mock.Anything, "testgroup", false).Return(tidbGroup, nil)

				// Mock shared pool load
				sharedPool := &entity.SharedPool{
					SharedPool: apiv1.SharedPool{
						Id:    "testsharedpool",
						Phase: apiv1.SharedPool_AVAILABLE,
						ComponentGroups: []*entity.Component{
							{
								Id:            "testgroup",
								ComponentType: apiv1.ComponentType_TIDB,
								Phase:         apiv1.Component_AVAILABLE,
							},
						},
					},
				}
				sharedPoolRepo.On("Load", mock.Anything, "testsharedpool", false).Return(sharedPool, nil)

				// Mock multiple QueryRunnings calls for mergeSharedPoolStatusFromDagTask
				// This method calls QueryRunnings multiple times for different DAG plans
				dagExecutor.On("QueryRunnings", mock.Anything, mock.Anything, mock.Anything).Return(executor.NewExecTaskIdStatus(), nil).Maybe()
				// Mock no restore
				scaleManager.On("AnyFullfillingDecision", mock.Anything, mock.Anything).Return(false, nil).Maybe()

				// Mock DAG execution
				tidbGroupRepo.On("Delete", mock.Anything, mock.Anything).Return(nil)
				dagExecutor.On("Submit", mock.Anything, dag.PlanDeleteTiDBGroup, mock.Anything, mock.Anything).Return(nil)
			},
			validate: func(t *testing.T, result *entity.TiDBGroup, err error) {
				t.Helper()
				require.NoError(t, err)
				require.NotNil(t, result)
				assert.Equal(t, "testgroup", result.GetId())
				assert.Equal(t, "testcluster", result.GetClusterId())
				assert.Equal(t, apiv1.TiDBGroup_UNAVAILABLE, result.GetPhase())
			},
		},
		{
			name:          "missing tidb group id",
			tidbClusterId: "testcluster",
			tidbGroupId:   "",
			setupMocks: func(*repomnocks.TiDBGroupRepo, *repomnocks.SharedPoolRepo, *repomnocks.LockRepo, *executormocks.RemoteExecutor, *bractionmocks.ScaleManager) {
			},
			expectedError: "tidbGroup id is required",
			expectedCode:  codes.InvalidArgument,
		},
		{
			name:          "missing tidb cluster id",
			tidbClusterId: "",
			tidbGroupId:   "testgroup",
			setupMocks: func(*repomnocks.TiDBGroupRepo, *repomnocks.SharedPoolRepo, *repomnocks.LockRepo, *executormocks.RemoteExecutor, *bractionmocks.ScaleManager) {
			},
			expectedError: "tidbCluster id is required",
			expectedCode:  codes.InvalidArgument,
		},
		{
			name:          "tidb group not found",
			tidbClusterId: "testcluster",
			tidbGroupId:   "nonexistent",
			setupMocks: func(tidbGroupRepo *repomnocks.TiDBGroupRepo, sharedPoolRepo *repomnocks.SharedPoolRepo, lockRepo *repomnocks.LockRepo, dagExecutor *executormocks.RemoteExecutor, scaleManager *bractionmocks.ScaleManager) {
				// Mock tidb group not found
				tidbGroupRepo.On("Load", mock.Anything, "nonexistent", false).Return(nil, status.Error(codes.NotFound, "not found"))
			},
			expectedError: "tidbGroup nonexistent not found",
			expectedCode:  codes.NotFound,
		},
		{
			name:          "tidb group belongs to different cluster",
			tidbClusterId: "testcluster",
			tidbGroupId:   "testgroup",
			setupMocks: func(tidbGroupRepo *repomnocks.TiDBGroupRepo, sharedPoolRepo *repomnocks.SharedPoolRepo, lockRepo *repomnocks.LockRepo, dagExecutor *executormocks.RemoteExecutor, scaleManager *bractionmocks.ScaleManager) {
				// Mock tidb group with different cluster id
				tidbGroup := &entity.TiDBGroup{
					TiDBGroup: apiv1.TiDBGroup{
						Id:           "testgroup",
						ClusterId:    "differentcluster",
						SharedPoolId: "testsharedpool",
						Phase:        apiv1.TiDBGroup_AVAILABLE,
					},
				}
				tidbGroupRepo.On("Load", mock.Anything, "testgroup", false).Return(tidbGroup, nil)
			},
			expectedError: "tidbGroup testgroup is not belong to tidbCluster testcluster",
			expectedCode:  codes.FailedPrecondition,
		},
		{
			name:          "tidb group already deleting",
			tidbClusterId: "testcluster",
			tidbGroupId:   "testgroup",
			setupMocks: func(tidbGroupRepo *repomnocks.TiDBGroupRepo, sharedPoolRepo *repomnocks.SharedPoolRepo, lockRepo *repomnocks.LockRepo, dagExecutor *executormocks.RemoteExecutor, scaleManager *bractionmocks.ScaleManager) {
				// Mock tidb group in deleting state
				tidbGroup := &entity.TiDBGroup{
					TiDBGroup: apiv1.TiDBGroup{
						Id:           "testgroup",
						ClusterId:    "testcluster",
						SharedPoolId: "testsharedpool",
						Phase:        apiv1.TiDBGroup_UNAVAILABLE,
					},
				}
				tidbGroupRepo.On("Load", mock.Anything, "testgroup", false).Return(tidbGroup, nil)

				// Mock shared pool load (required because delete logic loads shared pool)
				sharedPool := &entity.SharedPool{
					SharedPool: apiv1.SharedPool{
						Id:    "testsharedpool",
						Phase: apiv1.SharedPool_AVAILABLE,
					},
				}
				sharedPoolRepo.On("Load", mock.Anything, "testsharedpool", false).Return(sharedPool, nil)

				// Mock multiple QueryRunnings calls for mergeSharedPoolStatusFromDagTask
				dagExecutor.On("QueryRunnings", mock.Anything, mock.Anything, mock.Anything).Return(executor.NewExecTaskIdStatus(), nil).Maybe()
				// Mock no restore
				scaleManager.On("AnyFullfillingDecision", mock.Anything, mock.Anything).Return(false, nil).Maybe()

				// Mock DAG execution for delete
				tidbGroupRepo.On("Delete", mock.Anything, mock.Anything).Return(nil)
				dagExecutor.On("Submit", mock.Anything, dag.PlanDeleteTiDBGroup, mock.Anything, mock.Anything).Return(nil)
			},
			validate: func(t *testing.T, result *entity.TiDBGroup, err error) {
				t.Helper()
				require.NoError(t, err)
				require.NotNil(t, result)
				assert.Equal(t, "testgroup", result.GetId())
				assert.Equal(t, apiv1.TiDBGroup_UNAVAILABLE, result.GetPhase())
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			// Create mocks
			tidbGroupRepo := repomnocks.NewTiDBGroupRepo(t)
			sharedPoolRepo := repomnocks.NewSharedPoolRepo(t)
			lockRepo := repomnocks.NewLockRepo(t)
			dagExecutor := executormocks.NewRemoteExecutor(t)
			dataplaneClient := dataplanemocks.NewClient(t)
			clusterGatewayClient := clustergatewaymocks.NewClient(t)
			scaleManager := bractionmocks.NewScaleManager(t)
			// Setup mocks
			tt.setupMocks(tidbGroupRepo, sharedPoolRepo, lockRepo, dagExecutor, scaleManager)

			// Create server implementation
			server := &serverImpl{
				tidbGroupRepo:     tidbGroupRepo,
				sharedPoolRepo:    sharedPoolRepo,
				lockRepo:          lockRepo,
				dagExecutor:       dagExecutor,
				transactioner:     &mockTransactioner{},
				dataplaneClient:   dataplaneClient,
				clustergatewayCli: clusterGatewayClient,
				scaleManager:      scaleManager,
			}

			// Execute test
			result, err := server.DeleteTiDBGroup(context.Background(), tt.tidbClusterId, tt.tidbGroupId)

			// Validate results
			switch {
			case tt.expectedError != "":
				require.Error(t, err)
				require.Contains(t, err.Error(), tt.expectedError)
				if tt.expectedCode != codes.OK {
					require.Equal(t, tt.expectedCode, status.Code(err))
				}
				require.Nil(t, result)
			case tt.validate != nil:
				tt.validate(t, result, err)
			default:
				require.NoError(t, err)
				require.NotNil(t, result)
			}
		})
	}
}