package v1

import (
	"context"
	"fmt"

	"github.com/pkg/errors"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"

	v1pb "github.com/usememos/memos/proto/gen/api/v1"
	storepb "github.com/usememos/memos/proto/gen/store"
	"github.com/usememos/memos/store"
)

// GetInstanceProfile returns the instance profile.
func (s *APIV1Service) GetInstanceProfile(ctx context.Context, _ *v1pb.GetInstanceProfileRequest) (*v1pb.InstanceProfile, error) {
	instanceProfile := &v1pb.InstanceProfile{
		Version:     s.Profile.Version,
		Mode:        s.Profile.Mode,
		InstanceUrl: s.Profile.InstanceURL,
	}
	owner, err := s.GetInstanceOwner(ctx)
	if err != nil {
		return nil, status.Errorf(codes.Internal, "failed to get instance owner: %v", err)
	}
	if owner != nil {
		instanceProfile.Owner = owner.Name
	}
	return instanceProfile, nil
}

func (s *APIV1Service) GetInstanceSetting(ctx context.Context, request *v1pb.GetInstanceSettingRequest) (*v1pb.InstanceSetting, error) {
	instanceSettingKeyString, err := ExtractInstanceSettingKeyFromName(request.Name)
	if err != nil {
		return nil, status.Errorf(codes.InvalidArgument, "invalid instance setting name: %v", err)
	}

	instanceSettingKey := storepb.InstanceSettingKey(storepb.InstanceSettingKey_value[instanceSettingKeyString])
	// Get instance setting from store with default value.
	switch instanceSettingKey {
	case storepb.InstanceSettingKey_BASIC:
		_, err = s.Store.GetInstanceBasicSetting(ctx)
	case storepb.InstanceSettingKey_GENERAL:
		_, err = s.Store.GetInstanceGeneralSetting(ctx)
	case storepb.InstanceSettingKey_MEMO_RELATED:
		_, err = s.Store.GetInstanceMemoRelatedSetting(ctx)
	case storepb.InstanceSettingKey_STORAGE:
		_, err = s.Store.GetInstanceStorageSetting(ctx)
	default:
		return nil, status.Errorf(codes.InvalidArgument, "unsupported instance setting key: %v", instanceSettingKey)
	}
	if err != nil {
		return nil, status.Errorf(codes.Internal, "failed to get instance setting: %v", err)
	}

	instanceSetting, err := s.Store.GetInstanceSetting(ctx, &store.FindInstanceSetting{
		Name: instanceSettingKey.String(),
	})
	if err != nil {
		return nil, status.Errorf(codes.Internal, "failed to get instance setting: %v", err)
	}
	if instanceSetting == nil {
		return nil, status.Errorf(codes.NotFound, "instance setting not found")
	}

	// For storage setting, only host can get it.
	if instanceSetting.Key == storepb.InstanceSettingKey_STORAGE {
		user, err := s.fetchCurrentUser(ctx)
		if err != nil {
			return nil, status.Errorf(codes.Internal, "failed to get current user: %v", err)
		}
		if user == nil {
			return nil, status.Errorf(codes.Unauthenticated, "user not authenticated")
		}
		if user.Role != store.RoleHost {
			return nil, status.Errorf(codes.PermissionDenied, "permission denied")
		}
	}

	return convertInstanceSettingFromStore(instanceSetting), nil
}

func (s *APIV1Service) UpdateInstanceSetting(ctx context.Context, request *v1pb.UpdateInstanceSettingRequest) (*v1pb.InstanceSetting, error) {
	user, err := s.fetchCurrentUser(ctx)
	if err != nil {
		return nil, status.Errorf(codes.Internal, "failed to get current user: %v", err)
	}
	if user == nil {
		return nil, status.Errorf(codes.Unauthenticated, "user not authenticated")
	}
	if user.Role != store.RoleHost {
		return nil, status.Errorf(codes.PermissionDenied, "permission denied")
	}

	// TODO: Apply update_mask if specified
	_ = request.UpdateMask

	updateSetting := convertInstanceSettingToStore(request.Setting)
	instanceSetting, err := s.Store.UpsertInstanceSetting(ctx, updateSetting)
	if err != nil {
		return nil, status.Errorf(codes.Internal, "failed to upsert instance setting: %v", err)
	}

	return convertInstanceSettingFromStore(instanceSetting), nil
}

func convertInstanceSettingFromStore(setting *storepb.InstanceSetting) *v1pb.InstanceSetting {
	instanceSetting := &v1pb.InstanceSetting{
		Name: fmt.Sprintf("instance/settings/%s", setting.Key.String()),
	}
	switch setting.Value.(type) {
	case *storepb.InstanceSetting_GeneralSetting:
		instanceSetting.Value = &v1pb.InstanceSetting_GeneralSetting_{
			GeneralSetting: convertInstanceGeneralSettingFromStore(setting.GetGeneralSetting()),
		}
	case *storepb.InstanceSetting_StorageSetting:
		instanceSetting.Value = &v1pb.InstanceSetting_StorageSetting_{
			StorageSetting: convertInstanceStorageSettingFromStore(setting.GetStorageSetting()),
		}
	case *storepb.InstanceSetting_MemoRelatedSetting:
		instanceSetting.Value = &v1pb.InstanceSetting_MemoRelatedSetting_{
			MemoRelatedSetting: convertInstanceMemoRelatedSettingFromStore(setting.GetMemoRelatedSetting()),
		}
	}
	return instanceSetting
}

func convertInstanceSettingToStore(setting *v1pb.InstanceSetting) *storepb.InstanceSetting {
	settingKeyString, _ := ExtractInstanceSettingKeyFromName(setting.Name)
	instanceSetting := &storepb.InstanceSetting{
		Key: storepb.InstanceSettingKey(storepb.InstanceSettingKey_value[settingKeyString]),
		Value: &storepb.InstanceSetting_GeneralSetting{
			GeneralSetting: convertInstanceGeneralSettingToStore(setting.GetGeneralSetting()),
		},
	}
	switch instanceSetting.Key {
	case storepb.InstanceSettingKey_GENERAL:
		instanceSetting.Value = &storepb.InstanceSetting_GeneralSetting{
			GeneralSetting: convertInstanceGeneralSettingToStore(setting.GetGeneralSetting()),
		}
	case storepb.InstanceSettingKey_STORAGE:
		instanceSetting.Value = &storepb.InstanceSetting_StorageSetting{
			StorageSetting: convertInstanceStorageSettingToStore(setting.GetStorageSetting()),
		}
	case storepb.InstanceSettingKey_MEMO_RELATED:
		instanceSetting.Value = &storepb.InstanceSetting_MemoRelatedSetting{
			MemoRelatedSetting: convertInstanceMemoRelatedSettingToStore(setting.GetMemoRelatedSetting()),
		}
	default:
		// Keep the default GeneralSetting value
	}
	return instanceSetting
}

func convertInstanceGeneralSettingFromStore(setting *storepb.InstanceGeneralSetting) *v1pb.InstanceSetting_GeneralSetting {
	if setting == nil {
		return nil
	}

	generalSetting := &v1pb.InstanceSetting_GeneralSetting{
		DisallowUserRegistration: setting.DisallowUserRegistration,
		DisallowPasswordAuth:     setting.DisallowPasswordAuth,
		AdditionalScript:         setting.AdditionalScript,
		AdditionalStyle:          setting.AdditionalStyle,
		WeekStartDayOffset:       setting.WeekStartDayOffset,
		DisallowChangeUsername:   setting.DisallowChangeUsername,
		DisallowChangeNickname:   setting.DisallowChangeNickname,
	}
	if setting.CustomProfile != nil {
		generalSetting.CustomProfile = &v1pb.InstanceSetting_GeneralSetting_CustomProfile{
			Title:       setting.CustomProfile.Title,
			Description: setting.CustomProfile.Description,
			LogoUrl:     setting.CustomProfile.LogoUrl,
		}
	}
	return generalSetting
}

func convertInstanceGeneralSettingToStore(setting *v1pb.InstanceSetting_GeneralSetting) *storepb.InstanceGeneralSetting {
	if setting == nil {
		return nil
	}
	generalSetting := &storepb.InstanceGeneralSetting{
		DisallowUserRegistration: setting.DisallowUserRegistration,
		DisallowPasswordAuth:     setting.DisallowPasswordAuth,
		AdditionalScript:         setting.AdditionalScript,
		AdditionalStyle:          setting.AdditionalStyle,
		WeekStartDayOffset:       setting.WeekStartDayOffset,
		DisallowChangeUsername:   setting.DisallowChangeUsername,
		DisallowChangeNickname:   setting.DisallowChangeNickname,
	}
	if setting.CustomProfile != nil {
		generalSetting.CustomProfile = &storepb.InstanceCustomProfile{
			Title:       setting.CustomProfile.Title,
			Description: setting.CustomProfile.Description,
			LogoUrl:     setting.CustomProfile.LogoUrl,
		}
	}
	return generalSetting
}

func convertInstanceStorageSettingFromStore(settingpb *storepb.InstanceStorageSetting) *v1pb.InstanceSetting_StorageSetting {
	if settingpb == nil {
		return nil
	}
	setting := &v1pb.InstanceSetting_StorageSetting{
		StorageType:       v1pb.InstanceSetting_StorageSetting_StorageType(settingpb.StorageType),
		FilepathTemplate:  settingpb.FilepathTemplate,
		UploadSizeLimitMb: settingpb.UploadSizeLimitMb,
	}
	if settingpb.S3Config != nil {
		setting.S3Config = &v1pb.InstanceSetting_StorageSetting_S3Config{
			AccessKeyId:     settingpb.S3Config.AccessKeyId,
			AccessKeySecret: settingpb.S3Config.AccessKeySecret,
			Endpoint:        settingpb.S3Config.Endpoint,
			Region:          settingpb.S3Config.Region,
			Bucket:          settingpb.S3Config.Bucket,
			UsePathStyle:    settingpb.S3Config.UsePathStyle,
		}
	}
	return setting
}

func convertInstanceStorageSettingToStore(setting *v1pb.InstanceSetting_StorageSetting) *storepb.InstanceStorageSetting {
	if setting == nil {
		return nil
	}
	settingpb := &storepb.InstanceStorageSetting{
		StorageType:       storepb.InstanceStorageSetting_StorageType(setting.StorageType),
		FilepathTemplate:  setting.FilepathTemplate,
		UploadSizeLimitMb: setting.UploadSizeLimitMb,
	}
	if setting.S3Config != nil {
		settingpb.S3Config = &storepb.StorageS3Config{
			AccessKeyId:     setting.S3Config.AccessKeyId,
			AccessKeySecret: setting.S3Config.AccessKeySecret,
			Endpoint:        setting.S3Config.Endpoint,
			Region:          setting.S3Config.Region,
			Bucket:          setting.S3Config.Bucket,
			UsePathStyle:    setting.S3Config.UsePathStyle,
		}
	}
	return settingpb
}

func convertInstanceMemoRelatedSettingFromStore(setting *storepb.InstanceMemoRelatedSetting) *v1pb.InstanceSetting_MemoRelatedSetting {
	if setting == nil {
		return nil
	}
	return &v1pb.InstanceSetting_MemoRelatedSetting{
		DisallowPublicVisibility: setting.DisallowPublicVisibility,
		DisplayWithUpdateTime:    setting.DisplayWithUpdateTime,
		ContentLengthLimit:       setting.ContentLengthLimit,
		EnableDoubleClickEdit:    setting.EnableDoubleClickEdit,
		Reactions:                setting.Reactions,
	}
}

func convertInstanceMemoRelatedSettingToStore(setting *v1pb.InstanceSetting_MemoRelatedSetting) *storepb.InstanceMemoRelatedSetting {
	if setting == nil {
		return nil
	}
	return &storepb.InstanceMemoRelatedSetting{
		DisallowPublicVisibility: setting.DisallowPublicVisibility,
		DisplayWithUpdateTime:    setting.DisplayWithUpdateTime,
		ContentLengthLimit:       setting.ContentLengthLimit,
		EnableDoubleClickEdit:    setting.EnableDoubleClickEdit,
		Reactions:                setting.Reactions,
	}
}

var ownerCache *v1pb.User

func (s *APIV1Service) GetInstanceOwner(ctx context.Context) (*v1pb.User, error) {
	if ownerCache != nil {
		return ownerCache, nil
	}

	hostUserType := store.RoleHost
	user, err := s.Store.GetUser(ctx, &store.FindUser{
		Role: &hostUserType,
	})
	if err != nil {
		return nil, errors.Wrapf(err, "failed to find owner")
	}
	if user == nil {
		return nil, nil
	}

	ownerCache = convertUserFromStore(user)
	return ownerCache, nil
}
