<?php
/**
 * BuddyPress Groups Activity Functions.
 *
 * These functions handle the recording, deleting and formatting of activity
 * for the user and for this specific component.
 *
 * @package BuddyPress
 * @subpackage GroupsActivity
 * @since 1.5.0
 */

// Exit if accessed directly.
defined( 'ABSPATH' ) || exit;

/**
 * Register activity actions for the Groups component.
 *
 * @since 1.1.0
 *
 * @return false|null False on failure.
 */
function groups_register_activity_actions() {
	$bp = buddypress();

	if ( ! bp_is_active( 'activity' ) ) {
		return false;
	}

	bp_activity_set_action(
		$bp->groups->id,
		'created_group',
		__( 'Created a group', 'buddypress' ),
		'bp_groups_format_activity_action_created_group',
		__( 'New Groups', 'buddypress' ),
		array( 'activity', 'member', 'member_groups' )
	);

	bp_activity_set_action(
		$bp->groups->id,
		'joined_group',
		__( 'Joined a group', 'buddypress' ),
		'bp_groups_format_activity_action_joined_group',
		__( 'Group Memberships', 'buddypress' ),
		array( 'activity', 'group', 'member', 'member_groups' )
	);

	bp_activity_set_action(
		$bp->groups->id,
		'group_details_updated',
		__( 'Group details edited', 'buddypress' ),
		'bp_groups_format_activity_action_group_details_updated',
		__( 'Group Updates', 'buddypress' ),
		array( 'activity', 'group', 'member', 'member_groups' )
	);

	bp_activity_set_action(
		$bp->groups->id,
		'activity_update',
		__( 'Posted a status update in a Group', 'buddypress' ),
		'bp_groups_format_activity_action_group_activity_update',
		__( 'Group Activity Updates', 'buddypress' ),
		array( 'activity', 'group', 'member', 'member_groups' )
	);

	bp_activity_set_action(
		$bp->groups->id,
		'pinned_activity',
		__( 'Posted a status update in a Group', 'buddypress' ),
		'bp_groups_format_activity_action_group_activity_update',
		__( 'Group Activity Updates', 'buddypress' ),
		array( 'activity', 'group', 'member', 'member_groups' )
	);

	/**
	 * Fires at end of registration of the default activity actions for the Groups component.
	 *
	 * @since 1.1.0
	 */
	do_action( 'groups_register_activity_actions' );
}
add_action( 'bp_register_activity_actions', 'groups_register_activity_actions' );

/**
 * Get the group object the activity belongs to.
 *
 * @since 5.0.0
 *
 * @param integer $group_id The group ID the activity is linked to.
 * @return BP_Groups_Group  The group object the activity belongs to.
 */
function bp_groups_get_activity_group( $group_id = 0 ) {
	// If displaying a specific group, check the activity belongs to it.
	if ( bp_is_group() && bp_get_current_group_id() === (int) $group_id ) {
		$group = groups_get_current_group();

		// Otherwise get the group the activity belongs to.
	} else {
		$group = groups_get_group( $group_id );
	}

	return $group;
}

/**
 * Format 'created_group' activity actions.
 *
 * @since 2.0.0
 *
 * @param string $action   Static activity action.
 * @param object $activity Activity data object.
 * @return string
 */
function bp_groups_format_activity_action_created_group( $action, $activity ) {
	$user_link = bp_core_get_userlink( $activity->user_id );

	$group      = bp_groups_get_activity_group( $activity->item_id );
	$group_link = '<a href="' . esc_url( bp_get_group_permalink( $group ) ) . '">' . esc_html( $group->name ) . '</a>';

	/* translators: 1: the user link. 2: the group link. */
	$action = sprintf( esc_html__( '%1$s created the group %2$s', 'buddypress'), $user_link, $group_link );

	/**
	 * Filters the 'created_group' activity actions.
	 *
	 * @since 1.2.0
	 *
	 * @param string $action   The 'created_group' activity action.
	 * @param object $activity Activity data object.
	 */
	return apply_filters( 'groups_activity_created_group_action', $action, $activity );
}

/**
 * Format 'joined_group' activity actions.
 *
 * @since 2.0.0
 *
 * @param string $action   Static activity action.
 * @param object $activity Activity data object.
 * @return string
 */
function bp_groups_format_activity_action_joined_group( $action, $activity ) {
	$user_link = bp_core_get_userlink( $activity->user_id );

	$group      = bp_groups_get_activity_group( $activity->item_id );
	$group_link = '<a href="' . esc_url( bp_get_group_permalink( $group ) ) . '">' . esc_html( $group->name ) . '</a>';

	/* translators: 1: the user link. 2: the group link. */
	$action = sprintf( esc_html__( '%1$s joined the group %2$s', 'buddypress' ), $user_link, $group_link );

	// Legacy filters (do not follow parameter patterns of other activity
	// action filters, and requires apply_filters_ref_array()).
	if ( has_filter( 'groups_activity_membership_accepted_action' ) ) {
		$action = apply_filters_ref_array( 'groups_activity_membership_accepted_action', array( $action, $user_link, &$group ) );
	}

	// Another legacy filter.
	if ( has_filter( 'groups_activity_accepted_invite_action' ) ) {
		$action = apply_filters_ref_array( 'groups_activity_accepted_invite_action', array( $action, $activity->user_id, &$group ) );
	}

	/**
	 * Filters the 'joined_group' activity actions.
	 *
	 * @since 2.0.0
	 *
	 * @param string $action   The 'joined_group' activity actions.
	 * @param object $activity Activity data object.
	 */
	return apply_filters( 'bp_groups_format_activity_action_joined_group', $action, $activity );
}

/**
 * Format 'group_details_updated' activity actions.
 *
 * @since 2.2.0
 *
 * @param  string $action   Static activity action.
 * @param  object $activity Activity data object.
 * @return string
 */
function bp_groups_format_activity_action_group_details_updated( $action, $activity ) {
	$user_link = bp_core_get_userlink( $activity->user_id );

	$group      = bp_groups_get_activity_group( $activity->item_id );
	$group_link = '<a href="' . esc_url( bp_get_group_permalink( $group ) ) . '">' . esc_html( $group->name ) . '</a>';

	/*
	 * Changed group details are stored in groupmeta, keyed by the activity
	 * timestamp. See {@link bp_groups_group_details_updated_add_activity()}.
	 */
	$changed = groups_get_groupmeta( $activity->item_id, 'updated_details_' . $activity->date_recorded );

	// No changed details were found, so use a generic message.
	if ( empty( $changed ) ) {
		/* translators: 1: the user link. 2: the group link. */
		$action = sprintf( esc_html__( '%1$s updated details for the group %2$s', 'buddypress' ), $user_link, $group_link );

	// Name and description changed - to keep things short, don't describe changes in detail.
	} elseif ( isset( $changed['name'] ) && isset( $changed['description'] ) ) {
		/* translators: 1: the user link. 2: the group link. */
		$action = sprintf( esc_html__( '%1$s changed the name and description of the group %2$s', 'buddypress' ), $user_link, $group_link );

	// Name only.
	} elseif ( ! empty( $changed['name']['old'] ) && ! empty( $changed['name']['new'] ) ) {
		/* translators: 1: the user link. 2: the group link. 3: the old group name. 4: the new group name. */
		$action = sprintf( esc_html__( '%1$s changed the name of the group %2$s from "%3$s" to "%4$s"', 'buddypress' ), $user_link, $group_link, esc_html( $changed['name']['old'] ), esc_html( $changed['name']['new'] ) );

	// Description only.
	} elseif ( ! empty( $changed['description']['old'] ) && ! empty( $changed['description']['new'] ) ) {
		/* translators: 1: the user link. 2: the group link. 3: the old group description. 4: the new group description. */
		$action = sprintf( esc_html__( '%1$s changed the description of the group %2$s from "%3$s" to "%4$s"', 'buddypress' ), $user_link, $group_link, esc_html( $changed['description']['old'] ), esc_html( $changed['description']['new'] ) );

	} elseif ( ! empty( $changed['slug']['old'] ) && ! empty( $changed['slug']['new'] ) ) {
		/* translators: 1: the user link. 2: the group link. */
		$action = sprintf( esc_html__( '%1$s changed the permalink of the group %2$s.', 'buddypress' ), $user_link, $group_link );
	}

	/**
	 * Filters the 'group_details_updated' activity actions.
	 *
	 * @since 2.0.0
	 *
	 * @param string $action   The 'group_details_updated' activity actions.
	 * @param object $activity Activity data object.
	 */
	return apply_filters( 'bp_groups_format_activity_action_joined_group', $action, $activity );
}

/**
 * Format the action for activity updates posted in a Group.
 *
 * @since 5.0.0
 *
 * @param string $action   Static activity action.
 * @param object $activity Activity data object.
 * @return string          The formatted action for activity updates posted in a Group.
 */
function bp_groups_format_activity_action_group_activity_update( $action, $activity ) {
	$user_link = bp_core_get_userlink( $activity->user_id );
	$group     = bp_groups_get_activity_group( $activity->item_id );

	$group_link = '<a href="' . esc_url( bp_get_group_permalink( $group ) ) . '">' . esc_html( $group->name ) . '</a>';

	// Set the Activity update posted in a Group action.
	$action = sprintf(
		/* translators: 1: the user link. 2: the group link. */
		esc_html__( '%1$s posted an update in the group %2$s', 'buddypress' ),
		$user_link,
		$group_link
	);
	if (communityally_current_group_is_child_group($group)) {
		// do not mention group in the description
		$action = sprintf(
			/* translators: 1: the user link. 2: the group link. */
			esc_html__('%1$s posted an update in %2$s', 'communityally'),
			$user_link,
			$group_link
		);
	}

	/** This filter is documented in wp-includes/deprecated.php */
	$action = apply_filters_deprecated( 'groups_activity_new_update_action', array( $action ), '5.0.0', 'bp_groups_format_activity_action_group_activity_update' );

	/**
	 * Filters the Group's activity update action.
	 *
	 * @since 5.0.0
	 *
	 * @param string $action   The Group's activity update action.
	 * @param object $activity Activity data object.
	 */
	return apply_filters( 'bp_groups_format_activity_action_group_activity_update', $action, $activity );
}

/**
 * Fetch data related to groups at the beginning of an activity loop.
 *
 * This reduces database overhead during the activity loop.
 *
 * @since 2.0.0
 *
 * @param array $activities Array of activity items.
 * @return array
 */
function bp_groups_prefetch_activity_object_data( $activities ) {
	$group_ids = array();

	if ( empty( $activities ) ) {
		return $activities;
	}

	foreach ( $activities as $activity ) {
		if ( buddypress()->groups->id !== $activity->component ) {
			continue;
		}

		$group_ids[] = $activity->item_id;
	}

	if ( ! empty( $group_ids ) ) {

		// TEMPORARY - Once the 'populate_extras' issue is solved
		// in the groups component, we can do this with groups_get_groups()
		// rather than manually.
		$uncached_ids = array();
		foreach ( $group_ids as $group_id ) {
			if ( false === wp_cache_get( $group_id, 'bp_groups' ) ) {
				$uncached_ids[] = $group_id;
			}
		}

		if ( ! empty( $uncached_ids ) ) {
			global $wpdb;
			$bp = buddypress();
			$uncached_ids_sql = implode( ',', wp_parse_id_list( $uncached_ids ) );
			$groups = $wpdb->get_results( "SELECT * FROM {$bp->groups->table_name} WHERE id IN ({$uncached_ids_sql})" );
			foreach ( $groups as $group ) {
				wp_cache_set( $group->id, $group, 'bp_groups' );
			}
		}
	}

	return $activities;
}
add_filter( 'bp_activity_prefetch_object_data', 'bp_groups_prefetch_activity_object_data' );

/**
 * Set up activity arguments for use with the 'groups' scope.
 *
 * @since 2.2.0
 *
 * @param array $retval Empty array by default.
 * @param array $filter Current activity arguments.
 * @return array
 */
function bp_groups_filter_activity_scope( $retval = array(), $filter = array() ) {

	// Determine the user_id.
	if ( ! empty( $filter['user_id'] ) ) {
		$user_id = $filter['user_id'];
	} else {
		$user_id = bp_displayed_user_id()
			? bp_displayed_user_id()
			: bp_loggedin_user_id();
	}

	// Determine groups of user.
	$groups = groups_get_user_groups( $user_id );
	if ( empty( $groups['groups'] ) ) {
		$groups = array( 'groups' => 0 );
	}

	// Should we show all items regardless of sitewide visibility?
	$show_hidden = array();
	if ( ! empty( $user_id ) && ( $user_id !== bp_loggedin_user_id() ) ) {
		$show_hidden = array(
			'column' => 'hide_sitewide',
			'value'  => 0
		);
	}

	$retval = array(
		'relation' => 'AND',
		array(
			'relation' => 'AND',
			array(
				'column' => 'component',
				'value'  => buddypress()->groups->id
			),
			array(
				'column'  => 'item_id',
				'compare' => 'IN',
				'value'   => (array) $groups['groups']
			),
		),
		$show_hidden,

		// Overrides.
		'override' => array(
			'filter'      => array( 'user_id' => 0 ),
			'show_hidden' => true
		),
	);

	return $retval;
}
add_filter( 'bp_activity_set_groups_scope_args', 'bp_groups_filter_activity_scope', 10, 2 );

/**
 * Enforces group membership restrictions on activity favorite queries.
 *
 * @since 4.3.0

 * @param array $retval Query arguments.
 * @param array $filter
 * @return array
 */
function bp_groups_filter_activity_favorites_scope( $retval, $filter ) {
	// Only process for viewers looking at their own favorites feed.
	if ( ! empty( $filter['user_id'] ) ) {
		$user_id = (int) $filter['user_id'];
	} else {
		$user_id = bp_displayed_user_id() ? bp_displayed_user_id() : bp_loggedin_user_id();
	}

	if ( ! $user_id || ! is_user_logged_in() || $user_id !== bp_loggedin_user_id() ) {
		return $retval;
	}

	$favs = bp_activity_get_user_favorites( $user_id );
	if ( empty( $favs ) ) {
		return $retval;
	}

	$user_groups = bp_get_user_groups(
		$user_id,
		array(
			'is_admin' => null,
			'is_mod'   => null,
		)
	);

	if (bp_user_can($user_id, 'bp_moderate')) {
		$user_groups = array(); // set empty array so all the groups show up for user with moderate capabilities
	}

	$retval = array(
		'relation' => 'OR',

		// Allow hidden items for items unconnected to groups.
		'non_groups' => array(
			'relation' => 'AND',
			array(
				'column'  => 'component',
				'compare' => '!=',
				'value'   => buddypress()->groups->id,
			),
			array(
				'column'  => 'hide_sitewide',
				'compare' => 'IN',
				'value'   => array( 1, 0 ),
			),
			array(
				'column'  => 'id',
				'compare' => 'IN',
				'value'   => $favs,
			),
		),

		// Trust the favorites list for group items that are not hidden sitewide.
		'non_hidden_groups' => array(
			'relation' => 'AND',
			array(
				'column'  => 'component',
				'compare' => '=',
				'value'   => buddypress()->groups->id,
			),
			array(
				'column'  => 'hide_sitewide',
				'compare' => '=',
				'value'   => 0,
			),
			array(
				'column'  => 'id',
				'compare' => 'IN',
				'value'   => $favs,
			),
		),

		// For hidden group items, limit to those in the user's groups.
		'hidden_groups' => array(
			'relation' => 'AND',
			array(
				'column'  => 'component',
				'compare' => '=',
				'value'   => buddypress()->groups->id,
			),
			array(
				'column'  => 'hide_sitewide',
				'compare' => '=',
				'value'   => 1,
			),
			array(
				'column'  => 'id',
				'compare' => 'IN',
				'value'   => $favs,
			),
			array(
				'column'  => 'item_id',
				'compare' => 'IN',
				'value'   => communityally_append_child_groups_to_user_groups(wp_list_pluck( $user_groups, 'group_id' )),
			),
		),

		'override' => array(
			'display_comments' => true,
			'filter'           => array( 'user_id' => 0 ),
			'show_hidden'      => true,
		),
	);

	return $retval;
}
add_filter( 'bp_activity_set_favorites_scope_args', 'bp_groups_filter_activity_favorites_scope', 20, 2 );

/**
 * Record an activity item related to the Groups component.
 *
 * A wrapper for {@link bp_activity_add()} that provides some Groups-specific
 * defaults.
 *
 * @since 1.0.0
 *
 * @see bp_activity_add() for more detailed description of parameters and
 *      return values.
 *
 * @param array|string $args {
 *     An array of arguments for the new activity item. Accepts all parameters
 *     of {@link bp_activity_add()}. However, this wrapper provides some
 *     additional defaults, as described below:
 *     @type string $component     Default: the id of your Groups component
 *                                 (usually 'groups').
 *     @type bool   $hide_sitewide Default: True if the current group is not
 *                                 public, otherwise false.
 * }
 * @return WP_Error|bool|int See {@link bp_activity_add()}.
 */
function groups_record_activity( $args = '' ) {

	if ( ! bp_is_active( 'activity' ) ) {
		return false;
	}

	// Set the default for hide_sitewide by checking the status of the group.
	$hide_sitewide = false;
	if ( ! empty( $args['item_id'] ) ) {
		$group = bp_groups_get_activity_group( $args['item_id'] );

		if ( isset( $group->status ) && 'public' != $group->status ) {
			$hide_sitewide = true;
		}
	}

	$r = bp_parse_args( $args, array(
		'id'                => false,
		'user_id'           => bp_loggedin_user_id(),
		'action'            => '',
		'content'           => '',
		'primary_link'      => '',
		'component'         => buddypress()->groups->id,
		'type'              => false,
		'item_id'           => false,
		'secondary_item_id' => false,
		'recorded_time'     => bp_core_current_time(),
		'hide_sitewide'     => $hide_sitewide,
		'error_type'        => 'bool',
		'mentions'			=> array()
	), 'groups_record_activity' );

	return bp_activity_add( $r );
}

/**
 * Post an Activity status update affiliated with a group.
 *
 * @since 1.2.0
 * @since 2.6.0 Added 'error_type' parameter to $args.
 *
 * @param array|string $args {
 *     Array of arguments.
 *     @type string $content  The content of the update.
 *     @type int    $user_id  Optional. ID of the user posting the update. Default:
 *                            ID of the logged-in user.
 *     @type int    $group_id Optional. ID of the group to be affiliated with the
 *                            update. Default: ID of the current group.
 * }
 * @return WP_Error|bool|int Returns the ID of the new activity item on success, or false on failure.
 */
function groups_post_update( $args = '' ) {
	$bp = buddypress();

	$r = bp_parse_args( $args, array(
		'content'    => false,
		'type'       => 'activity_update',
		'user_id'    => bp_loggedin_user_id(),
		'group_id'   => 0,
		'error_type' => 'bool',
		'mentions' => array()
	), 'groups_post_update' );

	$group_id = (int) $r['group_id'];
	if ( ! $group_id && ! empty( $bp->groups->current_group->id ) ) {
		$group_id = (int) $bp->groups->current_group->id;
	}

	$content = $r['content'];
	$user_id = (int) $r['user_id'];
	if ( ! $content || ! strlen( trim( $content ) ) || ! $user_id || ! $group_id ) {
		return false;
	}

	$bp->groups->current_group = groups_get_group( $group_id );
	$id = empty($r['id'])? false: $r['id'];

	// Be sure the user is a member of the group before posting.
	if ( !communityally_user_can_access_group($user_id, $group_id) ) {
		return false;
	}

	/**
	 * Filters the content for the new group activity update.
	 *
	 * @since 1.2.0
	 *
	 * @param string $content The content of the update.
	 */
	$content_filtered = apply_filters( 'groups_activity_new_update_content', $content );

	$activity_param = array(
		'id'		 => $id,
		'user_id'    => $user_id,
		'content'    => $content_filtered,
		'type'       => $r['type'],
		'item_id'    => $group_id,
		'error_type' => $r['error_type'],
		'mentions' => $r['mentions'],
	);
	if (!empty($args['recorded_time'])) {
		$activity_param['recorded_time'] = $args['recorded_time'];
	}

	$activity_id = groups_record_activity($activity_param);

	groups_update_groupmeta( $group_id, 'last_activity', bp_core_current_time() );

	/**
	 * Fires after posting of an Activity status update affiliated with a group.
	 *
	 * @since 1.2.0
	 *
	 * @param string $content     The content of the update.
	 * @param int    $user_id     ID of the user posting the update.
	 * @param int    $group_id    ID of the group being posted to.
	 * @param bool   $activity_id Whether or not the activity recording succeeded.
	 */
	do_action( 'bp_groups_posted_update', $content, $user_id, $group_id, $activity_id );

	return $activity_id;
}

/**
 * Function used to determine if a user can delete a group activity item.
 *
 * Used as a filter callback to 'bp_activity_user_can_delete'.
 *
 * @since 6.0.0
 *
 * @param  bool   $retval   True if item can receive comments.
 * @param  object $activity Activity item being checked.
 * @return bool
 */
function bp_groups_filter_activity_user_can_delete( $retval, $activity ) {
	// Bail if no current user.
	if ( ! is_user_logged_in() ) {
		return $retval;
	}

	if ( isset( $activity->component ) || 'groups' !== $activity->component ) {
		return $retval;
	}

	// Trust the passed value for administrators.
	if ( bp_current_user_can( 'bp_moderate' ) ) {
		return $retval;
	}

	// Group administrators or moderators can delete content in that group that doesn't belong to them.
	$group_id = $activity->item_id;
	if ( groups_is_user_admin( bp_loggedin_user_id(), $group_id ) || groups_is_user_mod( bp_loggedin_user_id(), $group_id ) ) {
		$retval = true;
	}

	return $retval;
}
add_filter( 'bp_activity_user_can_delete', 'bp_groups_filter_activity_user_can_delete', 10, 2 );

/**
 * Function used to determine if a user can comment on a group activity item.
 *
 * Used as a filter callback to 'bp_activity_can_comment'.
 *
 * @since 3.0.0
 *
 * @param  bool                      $retval   True if item can receive comments.
 * @param  null|BP_Activity_Activity $activity Null by default. Pass an activity object to check against that instead.
 * @return bool
 */
function bp_groups_filter_activity_can_comment( $retval, $activity = null ) {
	// Bail if item cannot receive comments or if no current user.
	if ( empty( $retval ) || ! is_user_logged_in() ) {
		return $retval;
	}

	// Use passed activity object, if available.
	if ( is_a( $activity, 'BP_Activity_Activity' ) ) {
		$component = $activity->component;
		$group_id  = $activity->item_id;

	// Use activity info from current activity item in the loop.
	} else {
		$component = bp_get_activity_object_name();
		$group_id  = bp_get_activity_item_id();
	}

	// If not a group activity item, bail.
	if ( 'groups' !== $component ) {
		return $retval;
	}

	// If current user is not a group member or is banned, user cannot comment.
	if ( ! communityally_user_can_access_group(bp_loggedin_user_id(), $group_id) ||
		groups_is_user_banned( bp_loggedin_user_id(), $group_id ) ) {
		$retval = false;
	}

	return $retval;
}
add_filter( 'bp_activity_can_comment', 'bp_groups_filter_activity_can_comment', 99, 1 );

/**
 * Function used to determine if a user can reply on a group activity comment.
 *
 * Used as a filter callback to 'bp_activity_can_comment_reply'.
 *
 * @since 3.0.0
 *
 * @param  bool        $retval  True if activity comment can be replied to.
 * @param  object|bool $comment Current activity comment object. If empty, parameter is boolean false.
 * @return bool
 */
function bp_groups_filter_activity_can_comment_reply( $retval, $comment ) {
	// Bail if no current user, if comment is empty or if retval is already empty.
	if ( ! is_user_logged_in() || empty( $comment ) || empty( $retval ) ) {
		return $retval;
	}

	// Grab parent activity item.
	$parent = new BP_Activity_Activity( $comment->item_id );

	// Check to see if user can reply to parent group activity item.
	return bp_groups_filter_activity_can_comment( $retval, $parent );
}
add_filter( 'bp_activity_can_comment_reply', 'bp_groups_filter_activity_can_comment_reply', 99, 2 );

/**
 * Add an activity stream item when a member joins a group.
 *
 * @since 1.9.0
 *
 * @param int $user_id  ID of the user joining the group.
 * @param int $group_id ID of the group.
 * @return false|null False on failure.
 */
function bp_groups_membership_accepted_add_activity( $user_id, $group_id ) {

	// Bail if Activity is not active.
	if ( ! bp_is_active( 'activity' ) ) {
		return false;
	}

	// Get the group so we can get it's name.
	$group = groups_get_group( $group_id );

	/**
	 * Filters the 'membership_accepted' activity actions.
	 *
	 * @since 1.2.0
	 *
	 * @param string $value    The 'membership_accepted' activity action.
	 * @param int    $user_id  ID of the user joining the group.
	 * @param int    $group_id ID of the group. Passed by reference.
	 */
	$action = apply_filters_ref_array( 'groups_activity_membership_accepted_action', array( sprintf( __( '%1$s joined the group %2$s', 'buddypress' ), bp_core_get_userlink( $user_id ), '<a href="' . bp_get_group_permalink( $group ) . '">' . esc_attr( $group->name ) . '</a>' ), $user_id, &$group ) );

	// Record in activity streams.
	groups_record_activity( array(
		'action'  => $action,
		'type'    => 'joined_group',
		'item_id' => $group_id,
		'user_id' => $user_id
	) );
}
add_action( 'groups_membership_accepted', 'bp_groups_membership_accepted_add_activity', 10, 2 );

/**
 * Add an activity item when a group's details are updated.
 *
 * @since 2.2.0
 *
 * @param  int             $group_id       ID of the group.
 * @param  BP_Groups_Group $old_group      Group object before the details had been changed.
 * @param  bool            $notify_members True if the admin has opted to notify group members, otherwise false.
 * @return null|WP_Error|bool|int The ID of the activity on success. False on error.
 */
function bp_groups_group_details_updated_add_activity( $group_id, $old_group, $notify_members ) {

	// Bail if Activity is not active.
	if ( ! bp_is_active( 'activity' ) ) {
		return false;
	}

	if ( ! isset( $old_group->name ) || ! isset( $old_group->slug ) || ! isset( $old_group->description ) ) {
		return false;
	}

	// If the admin has opted not to notify members, don't post an activity item either.
	if ( empty( $notify_members ) ) {
		return;
	}

	$group = groups_get_group( array(
		'group_id' => $group_id,
	) );

	/*
	 * Store the changed data, which will be used to generate the activity
	 * action. Since we haven't yet created the activity item, we store the
	 * old group data in groupmeta, keyed by the timestamp that we'll put
	 * on the activity item.
	 */
	$changed = array();

	if ( $group->name !== $old_group->name ) {
		$changed['name'] = array(
			'old' => $old_group->name,
			'new' => $group->name,
		);
	}

	if ( $group->slug !== $old_group->slug ) {
		$changed['slug'] = array(
			'old' => $old_group->slug,
			'new' => $group->slug,
		);
	}

	if ( $group->description !== $old_group->description ) {
		$changed['description'] = array(
			'old' => $old_group->description,
			'new' => $group->description,
		);
	}

	// If there are no changes, don't post an activity item.
	if ( empty( $changed ) ) {
		return;
	}

	$time = bp_core_current_time();
	groups_update_groupmeta( $group_id, 'updated_details_' . $time, $changed );

	// Record in activity streams.
	return groups_record_activity( array(
		'type'          => 'group_details_updated',
		'item_id'       => $group_id,
		'user_id'       => bp_loggedin_user_id(),
		'recorded_time' => $time,

	) );

}
add_action( 'groups_details_updated', 'bp_groups_group_details_updated_add_activity', 10, 3 );

/**
 * Delete all activity items related to a specific group.
 *
 * @since 1.9.0
 *
 * @param int $group_id ID of the group.
 */
function bp_groups_delete_group_delete_all_activity( $group_id ) {
	if ( bp_is_active( 'activity' ) ) {
		bp_activity_delete_by_item_id( array(
			'item_id'   => $group_id,
			'component' => buddypress()->groups->id
		) );
	}
}
add_action( 'groups_delete_group', 'bp_groups_delete_group_delete_all_activity', 10 );

/**
 * Delete group member activity if they leave or are removed within 5 minutes of membership modification.
 *
 * If the user joined this group less than five minutes ago, remove the
 * joined_group activity so users cannot flood the activity stream by
 * joining/leaving the group in quick succession.
 *
 * @since 1.9.0
 *
 * @param int $group_id ID of the group.
 * @param int $user_id  ID of the user leaving the group.
 */
function bp_groups_leave_group_delete_recent_activity( $group_id, $user_id ) {

	// Bail if Activity component is not active.
	if ( ! bp_is_active( 'activity' ) ) {
		return;
	}

	// Get the member's group membership information.
	$membership = new BP_Groups_Member( $user_id, $group_id );

	if (empty($membership->date_modified)) {
		return;
	}

	// Check the time period, and maybe delete their recent group activity.
	if ( time() <= strtotime( '+5 minutes', (int) strtotime( $membership->date_modified ) ) ) {
		bp_activity_delete( array(
			'component' => buddypress()->groups->id,
			'type'      => 'joined_group',
			'user_id'   => $user_id,
			'item_id'   => $group_id
		) );
	}
}
add_action( 'groups_leave_group',   'bp_groups_leave_group_delete_recent_activity', 10, 2 );
add_action( 'groups_remove_member', 'bp_groups_leave_group_delete_recent_activity', 10, 2 );
add_action( 'groups_ban_member',    'bp_groups_leave_group_delete_recent_activity', 10, 2 );
