// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.

package app

import (
	"encoding/json"
	"net/http"
	"os"
	"strings"
	"unicode/utf8"

	"github.com/mattermost/mattermost-server/model"
)

func validateSchemeImportData(data *SchemeImportData) *model.AppError {

	if data.Scope == nil {
		return model.NewAppError("BulkImport", "app.import.validate_scheme_import_data.null_scope.error", nil, "", http.StatusBadRequest)
	}

	switch *data.Scope {
	case model.SCHEME_SCOPE_TEAM:
		if data.DefaultTeamAdminRole == nil || data.DefaultTeamUserRole == nil || data.DefaultChannelAdminRole == nil || data.DefaultChannelUserRole == nil {
			return model.NewAppError("BulkImport", "app.import.validate_scheme_import_data.wrong_roles_for_scope.error", nil, "", http.StatusBadRequest)
		}
	case model.SCHEME_SCOPE_CHANNEL:
		if data.DefaultTeamAdminRole != nil || data.DefaultTeamUserRole != nil || data.DefaultChannelAdminRole == nil || data.DefaultChannelUserRole == nil {
			return model.NewAppError("BulkImport", "app.import.validate_scheme_import_data.wrong_roles_for_scope.error", nil, "", http.StatusBadRequest)
		}
	default:
		return model.NewAppError("BulkImport", "app.import.validate_scheme_import_data.unknown_scheme.error", nil, "", http.StatusBadRequest)
	}

	if data.Name == nil || !model.IsValidSchemeName(*data.Name) {
		return model.NewAppError("BulkImport", "app.import.validate_scheme_import_data.name_invalid.error", nil, "", http.StatusBadRequest)
	}

	if data.DisplayName == nil || len(*data.DisplayName) == 0 || len(*data.DisplayName) > model.SCHEME_DISPLAY_NAME_MAX_LENGTH {
		return model.NewAppError("BulkImport", "app.import.validate_scheme_import_data.display_name_invalid.error", nil, "", http.StatusBadRequest)
	}

	if data.Description != nil && len(*data.Description) > model.SCHEME_DESCRIPTION_MAX_LENGTH {
		return model.NewAppError("BulkImport", "app.import.validate_scheme_import_data.description_invalid.error", nil, "", http.StatusBadRequest)
	}

	if data.DefaultTeamAdminRole != nil {
		if err := validateRoleImportData(data.DefaultTeamAdminRole); err != nil {
			return err
		}
	}

	if data.DefaultTeamUserRole != nil {
		if err := validateRoleImportData(data.DefaultTeamUserRole); err != nil {
			return err
		}
	}

	if data.DefaultChannelAdminRole != nil {
		if err := validateRoleImportData(data.DefaultChannelAdminRole); err != nil {
			return err
		}
	}

	if data.DefaultChannelUserRole != nil {
		if err := validateRoleImportData(data.DefaultChannelUserRole); err != nil {
			return err
		}
	}

	return nil
}

func validateRoleImportData(data *RoleImportData) *model.AppError {

	if data.Name == nil || !model.IsValidRoleName(*data.Name) {
		return model.NewAppError("BulkImport", "app.import.validate_role_import_data.name_invalid.error", nil, "", http.StatusBadRequest)
	}

	if data.DisplayName == nil || len(*data.DisplayName) == 0 || len(*data.DisplayName) > model.ROLE_DISPLAY_NAME_MAX_LENGTH {
		return model.NewAppError("BulkImport", "app.import.validate_role_import_data.display_name_invalid.error", nil, "", http.StatusBadRequest)
	}

	if data.Description != nil && len(*data.Description) > model.ROLE_DESCRIPTION_MAX_LENGTH {
		return model.NewAppError("BulkImport", "app.import.validate_role_import_data.description_invalid.error", nil, "", http.StatusBadRequest)
	}

	if data.Permissions != nil {
		for _, permission := range *data.Permissions {
			permissionValidated := false
			for _, p := range model.ALL_PERMISSIONS {
				if permission == p.Id {
					permissionValidated = true
					break
				}
			}

			if !permissionValidated {
				return model.NewAppError("BulkImport", "app.import.validate_role_import_data.invalid_permission.error", nil, "permission"+permission, http.StatusBadRequest)
			}
		}
	}

	return nil
}

func validateTeamImportData(data *TeamImportData) *model.AppError {

	if data.Name == nil {
		return model.NewAppError("BulkImport", "app.import.validate_team_import_data.name_missing.error", nil, "", http.StatusBadRequest)
	} else if len(*data.Name) > model.TEAM_NAME_MAX_LENGTH {
		return model.NewAppError("BulkImport", "app.import.validate_team_import_data.name_length.error", nil, "", http.StatusBadRequest)
	} else if model.IsReservedTeamName(*data.Name) {
		return model.NewAppError("BulkImport", "app.import.validate_team_import_data.name_reserved.error", nil, "", http.StatusBadRequest)
	} else if !model.IsValidTeamName(*data.Name) {
		return model.NewAppError("BulkImport", "app.import.validate_team_import_data.name_characters.error", nil, "", http.StatusBadRequest)
	}

	if data.DisplayName == nil {
		return model.NewAppError("BulkImport", "app.import.validate_team_import_data.display_name_missing.error", nil, "", http.StatusBadRequest)
	} else if utf8.RuneCountInString(*data.DisplayName) == 0 || utf8.RuneCountInString(*data.DisplayName) > model.TEAM_DISPLAY_NAME_MAX_RUNES {
		return model.NewAppError("BulkImport", "app.import.validate_team_import_data.display_name_length.error", nil, "", http.StatusBadRequest)
	}

	if data.Type == nil {
		return model.NewAppError("BulkImport", "app.import.validate_team_import_data.type_missing.error", nil, "", http.StatusBadRequest)
	} else if *data.Type != model.TEAM_OPEN && *data.Type != model.TEAM_INVITE {
		return model.NewAppError("BulkImport", "app.import.validate_team_import_data.type_invalid.error", nil, "", http.StatusBadRequest)
	}

	if data.Description != nil && len(*data.Description) > model.TEAM_DESCRIPTION_MAX_LENGTH {
		return model.NewAppError("BulkImport", "app.import.validate_team_import_data.description_length.error", nil, "", http.StatusBadRequest)
	}

	if data.Scheme != nil && !model.IsValidSchemeName(*data.Scheme) {
		return model.NewAppError("BulkImport", "app.import.validate_team_import_data.scheme_invalid.error", nil, "", http.StatusBadRequest)
	}

	return nil
}

func validateChannelImportData(data *ChannelImportData) *model.AppError {

	if data.Team == nil {
		return model.NewAppError("BulkImport", "app.import.validate_channel_import_data.team_missing.error", nil, "", http.StatusBadRequest)
	}

	if data.Name == nil {
		return model.NewAppError("BulkImport", "app.import.validate_channel_import_data.name_missing.error", nil, "", http.StatusBadRequest)
	} else if len(*data.Name) > model.CHANNEL_NAME_MAX_LENGTH {
		return model.NewAppError("BulkImport", "app.import.validate_channel_import_data.name_length.error", nil, "", http.StatusBadRequest)
	} else if !model.IsValidChannelIdentifier(*data.Name) {
		return model.NewAppError("BulkImport", "app.import.validate_channel_import_data.name_characters.error", nil, "", http.StatusBadRequest)
	}

	if data.DisplayName == nil {
		return model.NewAppError("BulkImport", "app.import.validate_channel_import_data.display_name_missing.error", nil, "", http.StatusBadRequest)
	} else if utf8.RuneCountInString(*data.DisplayName) == 0 || utf8.RuneCountInString(*data.DisplayName) > model.CHANNEL_DISPLAY_NAME_MAX_RUNES {
		return model.NewAppError("BulkImport", "app.import.validate_channel_import_data.display_name_length.error", nil, "", http.StatusBadRequest)
	}

	if data.Type == nil {
		return model.NewAppError("BulkImport", "app.import.validate_channel_import_data.type_missing.error", nil, "", http.StatusBadRequest)
	} else if *data.Type != model.CHANNEL_OPEN && *data.Type != model.CHANNEL_PRIVATE {
		return model.NewAppError("BulkImport", "app.import.validate_channel_import_data.type_invalid.error", nil, "", http.StatusBadRequest)
	}

	if data.Header != nil && utf8.RuneCountInString(*data.Header) > model.CHANNEL_HEADER_MAX_RUNES {
		return model.NewAppError("BulkImport", "app.import.validate_channel_import_data.header_length.error", nil, "", http.StatusBadRequest)
	}

	if data.Purpose != nil && utf8.RuneCountInString(*data.Purpose) > model.CHANNEL_PURPOSE_MAX_RUNES {
		return model.NewAppError("BulkImport", "app.import.validate_channel_import_data.purpose_length.error", nil, "", http.StatusBadRequest)
	}

	if data.Scheme != nil && !model.IsValidSchemeName(*data.Scheme) {
		return model.NewAppError("BulkImport", "app.import.validate_channel_import_data.scheme_invalid.error", nil, "", http.StatusBadRequest)
	}

	return nil
}

func validateUserImportData(data *UserImportData) *model.AppError {
	if data.ProfileImage != nil {
		if _, err := os.Stat(*data.ProfileImage); os.IsNotExist(err) {
			return model.NewAppError("BulkImport", "app.import.validate_user_import_data.profile_image.error", nil, "", http.StatusBadRequest)
		}
	}

	if data.Username == nil {
		return model.NewAppError("BulkImport", "app.import.validate_user_import_data.username_missing.error", nil, "", http.StatusBadRequest)
	} else if !model.IsValidUsername(*data.Username) {
		return model.NewAppError("BulkImport", "app.import.validate_user_import_data.username_invalid.error", nil, "", http.StatusBadRequest)
	}

	if data.Email == nil {
		return model.NewAppError("BulkImport", "app.import.validate_user_import_data.email_missing.error", nil, "", http.StatusBadRequest)
	} else if len(*data.Email) == 0 || len(*data.Email) > model.USER_EMAIL_MAX_LENGTH {
		return model.NewAppError("BulkImport", "app.import.validate_user_import_data.email_length.error", nil, "", http.StatusBadRequest)
	}

	if data.AuthData != nil && data.Password != nil {
		return model.NewAppError("BulkImport", "app.import.validate_user_import_data.auth_data_and_password.error", nil, "", http.StatusBadRequest)
	}

	if data.AuthData != nil && len(*data.AuthData) > model.USER_AUTH_DATA_MAX_LENGTH {
		return model.NewAppError("BulkImport", "app.import.validate_user_import_data.auth_data_length.error", nil, "", http.StatusBadRequest)
	}

	if data.Password != nil && len(*data.Password) == 0 {
		return model.NewAppError("BulkImport", "app.import.validate_user_import_data.password_length.error", nil, "", http.StatusBadRequest)
	}

	if data.Password != nil && len(*data.Password) > model.USER_PASSWORD_MAX_LENGTH {
		return model.NewAppError("BulkImport", "app.import.validate_user_import_data.password_length.error", nil, "", http.StatusBadRequest)
	}

	if data.Nickname != nil && utf8.RuneCountInString(*data.Nickname) > model.USER_NICKNAME_MAX_RUNES {
		return model.NewAppError("BulkImport", "app.import.validate_user_import_data.nickname_length.error", nil, "", http.StatusBadRequest)
	}

	if data.FirstName != nil && utf8.RuneCountInString(*data.FirstName) > model.USER_FIRST_NAME_MAX_RUNES {
		return model.NewAppError("BulkImport", "app.import.validate_user_import_data.first_name_length.error", nil, "", http.StatusBadRequest)
	}

	if data.LastName != nil && utf8.RuneCountInString(*data.LastName) > model.USER_LAST_NAME_MAX_RUNES {
		return model.NewAppError("BulkImport", "app.import.validate_user_import_data.last_name_length.error", nil, "", http.StatusBadRequest)
	}

	if data.Position != nil && utf8.RuneCountInString(*data.Position) > model.USER_POSITION_MAX_RUNES {
		return model.NewAppError("BulkImport", "app.import.validate_user_import_data.position_length.error", nil, "", http.StatusBadRequest)
	}

	if data.Roles != nil && !model.IsValidUserRoles(*data.Roles) {
		return model.NewAppError("BulkImport", "app.import.validate_user_import_data.roles_invalid.error", nil, "", http.StatusBadRequest)
	}

	if data.NotifyProps != nil {
		if data.NotifyProps.Desktop != nil && !model.IsValidUserNotifyLevel(*data.NotifyProps.Desktop) {
			return model.NewAppError("BulkImport", "app.import.validate_user_import_data.notify_props_desktop_invalid.error", nil, "", http.StatusBadRequest)
		}

		if data.NotifyProps.DesktopSound != nil && !model.IsValidTrueOrFalseString(*data.NotifyProps.DesktopSound) {
			return model.NewAppError("BulkImport", "app.import.validate_user_import_data.notify_props_desktop_sound_invalid.error", nil, "", http.StatusBadRequest)
		}

		if data.NotifyProps.Email != nil && !model.IsValidTrueOrFalseString(*data.NotifyProps.Email) {
			return model.NewAppError("BulkImport", "app.import.validate_user_import_data.notify_props_email_invalid.error", nil, "", http.StatusBadRequest)
		}

		if data.NotifyProps.Mobile != nil && !model.IsValidUserNotifyLevel(*data.NotifyProps.Mobile) {
			return model.NewAppError("BulkImport", "app.import.validate_user_import_data.notify_props_mobile_invalid.error", nil, "", http.StatusBadRequest)
		}

		if data.NotifyProps.MobilePushStatus != nil && !model.IsValidPushStatusNotifyLevel(*data.NotifyProps.MobilePushStatus) {
			return model.NewAppError("BulkImport", "app.import.validate_user_import_data.notify_props_mobile_push_status_invalid.error", nil, "", http.StatusBadRequest)
		}

		if data.NotifyProps.ChannelTrigger != nil && !model.IsValidTrueOrFalseString(*data.NotifyProps.ChannelTrigger) {
			return model.NewAppError("BulkImport", "app.import.validate_user_import_data.notify_props_channel_trigger_invalid.error", nil, "", http.StatusBadRequest)
		}

		if data.NotifyProps.CommentsTrigger != nil && !model.IsValidCommentsNotifyLevel(*data.NotifyProps.CommentsTrigger) {
			return model.NewAppError("BulkImport", "app.import.validate_user_import_data.notify_props_comments_trigger_invalid.error", nil, "", http.StatusBadRequest)
		}
	}

	if data.UseMarkdownPreview != nil && !model.IsValidTrueOrFalseString(*data.UseMarkdownPreview) {
		return model.NewAppError("BulkImport", "app.import.validate_user_import_data.advanced_props_feature_markdown_preview.error", nil, "", http.StatusBadRequest)
	}

	if data.UseFormatting != nil && !model.IsValidTrueOrFalseString(*data.UseFormatting) {
		return model.NewAppError("BulkImport", "app.import.validate_user_import_data.advanced_props_formatting.error", nil, "", http.StatusBadRequest)
	}

	if data.ShowUnreadSection != nil && !model.IsValidTrueOrFalseString(*data.ShowUnreadSection) {
		return model.NewAppError("BulkImport", "app.import.validate_user_import_data.advanced_props_show_unread_section.error", nil, "", http.StatusBadRequest)
	}

	if data.EmailInterval != nil && !model.IsValidEmailBatchingInterval(*data.EmailInterval) {
		return model.NewAppError("BulkImport", "app.import.validate_user_import_data.advanced_props_email_interval.error", nil, "", http.StatusBadRequest)
	}

	if data.Teams != nil {
		return validateUserTeamsImportData(data.Teams)
	}

	return nil
}

func validateUserTeamsImportData(data *[]UserTeamImportData) *model.AppError {
	if data == nil {
		return nil
	}

	for _, tdata := range *data {
		if tdata.Name == nil {
			return model.NewAppError("BulkImport", "app.import.validate_user_teams_import_data.team_name_missing.error", nil, "", http.StatusBadRequest)
		}

		if tdata.Roles != nil && !model.IsValidUserRoles(*tdata.Roles) {
			return model.NewAppError("BulkImport", "app.import.validate_user_teams_import_data.invalid_roles.error", nil, "", http.StatusBadRequest)
		}

		if tdata.Channels != nil {
			if err := validateUserChannelsImportData(tdata.Channels); err != nil {
				return err
			}
		}

		if tdata.Theme != nil && 0 < len(strings.Trim(*tdata.Theme, " \t\r")) {
			var unused map[string]string
			if err := json.NewDecoder(strings.NewReader(*tdata.Theme)).Decode(&unused); err != nil {
				return model.NewAppError("BulkImport", "app.import.validate_user_teams_import_data.invalid_team_theme.error", nil, err.Error(), http.StatusBadRequest)
			}
		}
	}

	return nil
}

func validateUserChannelsImportData(data *[]UserChannelImportData) *model.AppError {
	if data == nil {
		return nil
	}

	for _, cdata := range *data {
		if cdata.Name == nil {
			return model.NewAppError("BulkImport", "app.import.validate_user_channels_import_data.channel_name_missing.error", nil, "", http.StatusBadRequest)
		}

		if cdata.Roles != nil && !model.IsValidUserRoles(*cdata.Roles) {
			return model.NewAppError("BulkImport", "app.import.validate_user_channels_import_data.invalid_roles.error", nil, "", http.StatusBadRequest)
		}

		if cdata.NotifyProps != nil {
			if cdata.NotifyProps.Desktop != nil && !model.IsChannelNotifyLevelValid(*cdata.NotifyProps.Desktop) {
				return model.NewAppError("BulkImport", "app.import.validate_user_channels_import_data.invalid_notify_props_desktop.error", nil, "", http.StatusBadRequest)
			}

			if cdata.NotifyProps.Mobile != nil && !model.IsChannelNotifyLevelValid(*cdata.NotifyProps.Mobile) {
				return model.NewAppError("BulkImport", "app.import.validate_user_channels_import_data.invalid_notify_props_mobile.error", nil, "", http.StatusBadRequest)
			}

			if cdata.NotifyProps.MarkUnread != nil && !model.IsChannelMarkUnreadLevelValid(*cdata.NotifyProps.MarkUnread) {
				return model.NewAppError("BulkImport", "app.import.validate_user_channels_import_data.invalid_notify_props_mark_unread.error", nil, "", http.StatusBadRequest)
			}
		}
	}

	return nil
}

func validateReactionImportData(data *ReactionImportData, parentCreateAt int64) *model.AppError {
	if data.User == nil {
		return model.NewAppError("BulkImport", "app.import.validate_reaction_import_data.user_missing.error", nil, "", http.StatusBadRequest)
	}

	if data.EmojiName == nil {
		return model.NewAppError("BulkImport", "app.import.validate_reaction_import_data.emoji_name_missing.error", nil, "", http.StatusBadRequest)
	} else if utf8.RuneCountInString(*data.EmojiName) > model.EMOJI_NAME_MAX_LENGTH {
		return model.NewAppError("BulkImport", "app.import.validate_reaction_import_data.emoji_name_length.error", nil, "", http.StatusBadRequest)
	}

	if data.CreateAt == nil {
		return model.NewAppError("BulkImport", "app.import.validate_reaction_import_data.create_at_missing.error", nil, "", http.StatusBadRequest)
	} else if *data.CreateAt == 0 {
		return model.NewAppError("BulkImport", "app.import.validate_reaction_import_data.create_at_zero.error", nil, "", http.StatusBadRequest)
	} else if *data.CreateAt < parentCreateAt {
		return model.NewAppError("BulkImport", "app.import.validate_reaction_import_data.create_at_before_parent.error", nil, "", http.StatusBadRequest)
	}

	return nil
}

func validateReplyImportData(data *ReplyImportData, parentCreateAt int64, maxPostSize int) *model.AppError {
	if data.User == nil {
		return model.NewAppError("BulkImport", "app.import.validate_reply_import_data.user_missing.error", nil, "", http.StatusBadRequest)
	}

	if data.Message == nil {
		return model.NewAppError("BulkImport", "app.import.validate_reply_import_data.message_missing.error", nil, "", http.StatusBadRequest)
	} else if utf8.RuneCountInString(*data.Message) > maxPostSize {
		return model.NewAppError("BulkImport", "app.import.validate_reply_import_data.message_length.error", nil, "", http.StatusBadRequest)
	}

	if data.CreateAt == nil {
		return model.NewAppError("BulkImport", "app.import.validate_reply_import_data.create_at_missing.error", nil, "", http.StatusBadRequest)
	} else if *data.CreateAt == 0 {
		return model.NewAppError("BulkImport", "app.import.validate_reply_import_data.create_at_zero.error", nil, "", http.StatusBadRequest)
	} else if *data.CreateAt < parentCreateAt {
		return model.NewAppError("BulkImport", "app.import.validate_reply_import_data.create_at_before_parent.error", nil, "", http.StatusBadRequest)
	}

	return nil
}

func validatePostImportData(data *PostImportData, maxPostSize int) *model.AppError {
	if data.Team == nil {
		return model.NewAppError("BulkImport", "app.import.validate_post_import_data.team_missing.error", nil, "", http.StatusBadRequest)
	}

	if data.Channel == nil {
		return model.NewAppError("BulkImport", "app.import.validate_post_import_data.channel_missing.error", nil, "", http.StatusBadRequest)
	}

	if data.User == nil {
		return model.NewAppError("BulkImport", "app.import.validate_post_import_data.user_missing.error", nil, "", http.StatusBadRequest)
	}

	if data.Message == nil {
		return model.NewAppError("BulkImport", "app.import.validate_post_import_data.message_missing.error", nil, "", http.StatusBadRequest)
	} else if utf8.RuneCountInString(*data.Message) > maxPostSize {
		return model.NewAppError("BulkImport", "app.import.validate_post_import_data.message_length.error", nil, "", http.StatusBadRequest)
	}

	if data.CreateAt == nil {
		return model.NewAppError("BulkImport", "app.import.validate_post_import_data.create_at_missing.error", nil, "", http.StatusBadRequest)
	} else if *data.CreateAt == 0 {
		return model.NewAppError("BulkImport", "app.import.validate_post_import_data.create_at_zero.error", nil, "", http.StatusBadRequest)
	}

	if data.Reactions != nil {
		for _, reaction := range *data.Reactions {
			validateReactionImportData(&reaction, *data.CreateAt)
		}
	}

	if data.Replies != nil {
		for _, reply := range *data.Replies {
			validateReplyImportData(&reply, *data.CreateAt, maxPostSize)
		}
	}

	return nil
}

func validateDirectChannelImportData(data *DirectChannelImportData) *model.AppError {
	if data.Members == nil {
		return model.NewAppError("BulkImport", "app.import.validate_direct_channel_import_data.members_required.error", nil, "", http.StatusBadRequest)
	}

	if len(*data.Members) != 2 {
		if len(*data.Members) < model.CHANNEL_GROUP_MIN_USERS {
			return model.NewAppError("BulkImport", "app.import.validate_direct_channel_import_data.members_too_few.error", nil, "", http.StatusBadRequest)
		} else if len(*data.Members) > model.CHANNEL_GROUP_MAX_USERS {
			return model.NewAppError("BulkImport", "app.import.validate_direct_channel_import_data.members_too_many.error", nil, "", http.StatusBadRequest)
		}
	}

	if data.Header != nil && utf8.RuneCountInString(*data.Header) > model.CHANNEL_HEADER_MAX_RUNES {
		return model.NewAppError("BulkImport", "app.import.validate_direct_channel_import_data.header_length.error", nil, "", http.StatusBadRequest)
	}

	if data.FavoritedBy != nil {
		for _, favoriter := range *data.FavoritedBy {
			found := false
			for _, member := range *data.Members {
				if favoriter == member {
					found = true
					break
				}
			}
			if !found {
				return model.NewAppError("BulkImport", "app.import.validate_direct_channel_import_data.unknown_favoriter.error", map[string]interface{}{"Username": favoriter}, "", http.StatusBadRequest)
			}
		}
	}

	return nil
}

func validateDirectPostImportData(data *DirectPostImportData, maxPostSize int) *model.AppError {
	if data.ChannelMembers == nil {
		return model.NewAppError("BulkImport", "app.import.validate_direct_post_import_data.channel_members_required.error", nil, "", http.StatusBadRequest)
	}

	if len(*data.ChannelMembers) != 2 {
		if len(*data.ChannelMembers) < model.CHANNEL_GROUP_MIN_USERS {
			return model.NewAppError("BulkImport", "app.import.validate_direct_post_import_data.channel_members_too_few.error", nil, "", http.StatusBadRequest)
		} else if len(*data.ChannelMembers) > model.CHANNEL_GROUP_MAX_USERS {
			return model.NewAppError("BulkImport", "app.import.validate_direct_post_import_data.channel_members_too_many.error", nil, "", http.StatusBadRequest)
		}
	}

	if data.User == nil {
		return model.NewAppError("BulkImport", "app.import.validate_direct_post_import_data.user_missing.error", nil, "", http.StatusBadRequest)
	}

	if data.Message == nil {
		return model.NewAppError("BulkImport", "app.import.validate_direct_post_import_data.message_missing.error", nil, "", http.StatusBadRequest)
	} else if utf8.RuneCountInString(*data.Message) > maxPostSize {
		return model.NewAppError("BulkImport", "app.import.validate_direct_post_import_data.message_length.error", nil, "", http.StatusBadRequest)
	}

	if data.CreateAt == nil {
		return model.NewAppError("BulkImport", "app.import.validate_direct_post_import_data.create_at_missing.error", nil, "", http.StatusBadRequest)
	} else if *data.CreateAt == 0 {
		return model.NewAppError("BulkImport", "app.import.validate_direct_post_import_data.create_at_zero.error", nil, "", http.StatusBadRequest)
	}

	if data.FlaggedBy != nil {
		for _, flagger := range *data.FlaggedBy {
			found := false
			for _, member := range *data.ChannelMembers {
				if flagger == member {
					found = true
					break
				}
			}
			if !found {
				return model.NewAppError("BulkImport", "app.import.validate_direct_post_import_data.unknown_flagger.error", map[string]interface{}{"Username": flagger}, "", http.StatusBadRequest)
			}
		}
	}

	if data.Reactions != nil {
		for _, reaction := range *data.Reactions {
			validateReactionImportData(&reaction, *data.CreateAt)
		}
	}

	if data.Replies != nil {
		for _, reply := range *data.Replies {
			validateReplyImportData(&reply, *data.CreateAt, maxPostSize)
		}
	}

	return nil
}

func validateEmojiImportData(data *EmojiImportData) *model.AppError {
	if data == nil {
		return model.NewAppError("BulkImport", "app.import.validate_emoji_import_data.empty.error", nil, "", http.StatusBadRequest)
	}

	if data.Name == nil || len(*data.Name) == 0 {
		return model.NewAppError("BulkImport", "app.import.validate_emoji_import_data.name_missing.error", nil, "", http.StatusBadRequest)
	}

	if err := model.IsValidEmojiName(*data.Name); err != nil {
		return err
	}

	if data.Image == nil || len(*data.Image) == 0 {
		return model.NewAppError("BulkImport", "app.import.validate_emoji_import_data.image_missing.error", nil, "", http.StatusBadRequest)
	}

	return nil
}