EE_Line_Item - Code Metrics - Inspection of "Daily Inspection: Merge branch 'master' into FET-1..." - eventespresso/event-espresso-core - Measure and Improve Code Quality continuously with Scrutinizer

Completed
Branch — FET-10766-extract-activation-d... (a650cc)

unknown
created 2017-09-29 21:23 UTC
EE_Line_Item D

↳ Parent: Project
Complexity

Total Complexity
190
Size/Duplication

Total Lines	1497
Duplicated Lines	1.47 %
Coupling/Cohesion

Components	1
Dependencies	10
Importance

Changes
Metric	Value
dl	22
loc	1497
rs	4.4102
c	0
b	0
f	0
wmc	190
lcom	1
cbo	10
79 Methods

Rating	Name	Duplication	Size	Complexity
A	new_instance_from_db()	0	4	1
A	__construct()	0	7	2
A	ID()	0	4	1
A	TXN_ID()	0	4	1
A	set_TXN_ID()	0	4	1
A	name()	0	8	2
A	set_name()	0	4	1
A	desc()	0	4	1
A	set_desc()	0	4	1
A	quantity()	0	4	1
A	set_quantity()	0	4	1
A	OBJ_ID()	0	4	1
A	set_OBJ_ID()	0	4	1
A	OBJ_type()	0	4	1
B	OBJ_type_i18n()	0	22	6
A	set_OBJ_type()	0	4	1
A	unit_price()	0	4	1
A	set_unit_price()	0	4	1
C	is_percent()	0	26	8
A	percent()	0	4	1
A	set_percent()	0	4	1
A	total()	0	4	1
A	set_total()	0	4	1
A	order()	0	4	1
A	set_order()	0	4	1
A	parent_ID()	0	4	1
A	set_parent_ID()	0	4	1
A	type()	0	4	1
A	set_type()	0	4	1
A	parent()	0	6	2
A	children()	0	15	3
A	code()	0	4	1
A	set_code()	0	4	1
A	is_taxable()	0	4	1
A	set_is_taxable()	0	4	1
A	get_object()	0	7	2
A	ticket()	0	7	1
A	get_ticket_datetime()	9	13	4
A	ticket_event_name()	0	9	2
A	ticket_event()	6	12	3
A	ticket_datetime_start()	0	9	2
C	add_child_line_item()	0	24	8
A	set_parent()	0	13	3
A	get_child_line_item()	0	11	3
A	delete_children_line_items()	0	9	2
B	delete_child_line_item()	0	22	6
A	delete_if_childless_subtotal()	0	7	4
A	generate_code()	0	5	1
A	is_tax()	0	4	1
A	is_tax_sub_total()	0	4	1
A	is_line_item()	0	4	1
A	is_sub_line_item()	0	4	1
A	is_sub_total()	0	4	1
A	is_cancellation()	0	4	1
A	is_total()	0	4	1
A	is_cancelled()	0	4	1
A	unit_price_no_code()	0	4	1
A	total_no_code()	0	4	1
B	recalculate_total_including_taxes()	0	24	5
D	recalculate_pre_tax_total()	0	47	21
C	_recalculate_pretax_total_for_subtotal()	0	36	8
C	_recalculate_pretax_total_for_line_item()	0	40	7
A	recalculate_taxes_and_tax_total()	0	16	2
C	_recalculate_tax_sub_total()	0	22	7
A	get_total_tax()	0	11	3
B	get_items_total()	0	17	5
A	tax_descendants()	0	4	1
A	get_items()	0	4	1
B	taxable_total()	0	20	7
A	transaction()	0	4	1
B	save_this_and_descendants_to_txn()	0	19	5
A	save_this_and_descendants()	0	15	4
A	get_cancellations()	0	5	1
A	maybe_save()	0	7	2
A	clear_related_line_item_cache()	0	5	1
A	timestamp()	0	6	2
A	_get_descendants_of_type()	0	8	1
A	get_nearest_descendant_of_type()	0	8	1
A	new_instance()	7	7	2
How to fix Duplicated Code Complexity

Duplicated Code

Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
If you have the same expression in different places: Extract expression to a method
If you have the same method in different sub-classes: Extract method, and pull up field to the parent class
If you have the same code in unrelated classes: Consider extracting the code to a new class, and injecting that class
Complex Class

Tip: Before tackling complexity, make sure that you eliminate any duplication first. This often can reduce the size of classes significantly.
Complex classes like EE_Line_Item often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use EE_Line_Item, and based on these observations, apply Extract Interface, too.
<?php

use EventEspresso\core\exceptions\InvalidDataTypeException;
use EventEspresso\core\exceptions\InvalidInterfaceException;

defined('EVENT_ESPRESSO_VERSION') || exit('No direct script access allowed');



/**
 * EE_Line_Item class
 * see EEM_Line_Item for description
 *
 * @package            Event Espresso
 * @subpackage         includes/classes/EE_Line_Item.class.php
 * @author             Michael Nelson
 */
class EE_Line_Item extends EE_Base_Class implements EEI_Line_Item
{

    /**
     * for children line items (currently not a normal relation)
     *
     * @type EE_Line_Item[]
     */
    protected $_children = array();

    /**
     * for the parent line item
     *
     * @var EE_Line_Item
     */
    protected $_parent;



    /**
     *
     * @param array  $props_n_values          incoming values
     * @param string $timezone                incoming timezone (if not set the timezone set for the website will be
     *                                        used.)
     * @param array  $date_formats            incoming date_formats in an array where the first value is the
     *                                        date_format and the second value is the time format
     * @return EE_Line_Item
     * @throws EE_Error
     */
    public static function new_instance($props_n_values = array(), $timezone = null, $date_formats = array())
    {
        $has_object = parent::_check_for_object($props_n_values, __CLASS__, $timezone, $date_formats);
        return $has_object
            ? $has_object
            : new self($props_n_values, false, $timezone);
    }



    /**
     * @param array  $props_n_values  incoming values from the database
     * @param string $timezone        incoming timezone as set by the model.  If not set the timezone for
     *                                the website will be used.
     * @return EE_Line_Item
     * @throws EE_Error
     */
    public static function new_instance_from_db($props_n_values = array(), $timezone = null)
    {
        return new self($props_n_values, true, $timezone);
    }



    /**
     * Adds some defaults if they're not specified
     *
     * @param array  $fieldValues
     * @param bool   $bydb
     * @param string $timezone
     * @throws EE_Error
     */
    protected function __construct($fieldValues = array(), $bydb = false, $timezone = '')
    {
        parent::__construct($fieldValues, $bydb, $timezone);
        if (! $this->get('LIN_code')) {
            $this->set_code($this->generate_code());
        }
    }



    /**
     * Gets ID
     *
     * @return int
     * @throws EE_Error
     */
    public function ID()
    {
        return $this->get('LIN_ID');
    }



    /**
     * Gets TXN_ID
     *
     * @return int
     * @throws EE_Error
     */
    public function TXN_ID()
    {
        return $this->get('TXN_ID');
    }



    /**
     * Sets TXN_ID
     *
     * @param int $TXN_ID
     * @throws EE_Error
     */
    public function set_TXN_ID($TXN_ID)
    {
        $this->set('TXN_ID', $TXN_ID);
    }



    /**
     * Gets name
     *
     * @return string
     * @throws EE_Error
     */
    public function name()
    {
        $name = $this->get('LIN_name');
        if (! $name) {
            $name = ucwords(str_replace('-', ' ', $this->type()));
        }
        return $name;
    }



    /**
     * Sets name
     *
     * @param string $name
     * @throws EE_Error
     */
    public function set_name($name)
    {
        $this->set('LIN_name', $name);
    }



    /**
     * Gets desc
     *
     * @return string
     * @throws EE_Error
     */
    public function desc()
    {
        return $this->get('LIN_desc');
    }



    /**
     * Sets desc
     *
     * @param string $desc
     * @throws EE_Error
     */
    public function set_desc($desc)
    {
        $this->set('LIN_desc', $desc);
    }



    /**
     * Gets quantity
     *
     * @return int
     * @throws EE_Error
     */
    public function quantity()
    {
        return $this->get('LIN_quantity');
    }



    /**
     * Sets quantity
     *
     * @param int $quantity
     * @throws EE_Error
     */
    public function set_quantity($quantity)
    {
        $this->set('LIN_quantity', max($quantity, 0));
    }



    /**
     * Gets item_id
     *
     * @return string
     * @throws EE_Error
     */
    public function OBJ_ID()
    {
        return $this->get('OBJ_ID');
    }



    /**
     * Sets item_id
     *
     * @param string $item_id
     * @throws EE_Error
     */
    public function set_OBJ_ID($item_id)
    {
        $this->set('OBJ_ID', $item_id);
    }



    /**
     * Gets item_type
     *
     * @return string
     * @throws EE_Error
     */
    public function OBJ_type()
    {
        return $this->get('OBJ_type');
    }



    /**
     * Gets item_type
     *
     * @return string
     * @throws EE_Error
     */
    public function OBJ_type_i18n()
    {
        $obj_type = $this->OBJ_type();
        switch ($obj_type) {
            case 'Event':
                $obj_type = __('Event', 'event_espresso');
                break;
            case 'Price':
                $obj_type = __('Price', 'event_espresso');
                break;
            case 'Promotion':
                $obj_type = __('Promotion', 'event_espresso');
                break;
            case 'Ticket':
                $obj_type = __('Ticket', 'event_espresso');
                break;
            case 'Transaction':
                $obj_type = __('Transaction', 'event_espresso');
                break;
        }
        return apply_filters('FHEE__EE_Line_Item__OBJ_type_i18n', $obj_type, $this);
    }



    /**
     * Sets item_type
     *
     * @param string $OBJ_type
     * @throws EE_Error
     */
    public function set_OBJ_type($OBJ_type)
    {
        $this->set('OBJ_type', $OBJ_type);
    }



    /**
     * Gets unit_price
     *
     * @return float
     * @throws EE_Error
     */
    public function unit_price()
    {
        return $this->get('LIN_unit_price');
    }



    /**
     * Sets unit_price
     *
     * @param float $unit_price
     * @throws EE_Error
     */
    public function set_unit_price($unit_price)
    {
        $this->set('LIN_unit_price', $unit_price);
    }



    /**
     * Checks if this item is a percentage modifier or not
     *
     * @return boolean
     * @throws EE_Error
     */
    public function is_percent()
    {
        if ($this->is_tax_sub_total()) {
            //tax subtotals HAVE a percent on them, that percentage only applies
            //to taxable items, so its' an exception. Treat it like a flat line item
            return false;
        }
        $unit_price = abs($this->get('LIN_unit_price'));
        $percent = abs($this->get('LIN_percent'));
        if ($unit_price < .001 && $percent) {
            return true;
        }
        if ($unit_price >= .001 && ! $percent) {
            return false;
        }
        if ($unit_price >= .001 && $percent) {
            throw new EE_Error(
                sprintf(
                    esc_html__('A Line Item can not have a unit price of (%s) AND a percent (%s)!', 'event_espresso'),
                    $unit_price, $percent
                )
            );
        }
        // if they're both 0, assume its not a percent item
        return false;
    }



    /**
     * Gets percent (between 100-.001)
     *
     * @return float
     * @throws EE_Error
     */
    public function percent()
    {
        return $this->get('LIN_percent');
    }



    /**
     * Sets percent (between 100-0.01)
     *
     * @param float $percent
     * @throws EE_Error
     */
    public function set_percent($percent)
    {
        $this->set('LIN_percent', $percent);
    }



    /**
     * Gets total
     *
     * @return float
     * @throws EE_Error
     */
    public function total()
    {
        return $this->get('LIN_total');
    }



    /**
     * Sets total
     *
     * @param float $total
     * @throws EE_Error
     */
    public function set_total($total)
    {
        $this->set('LIN_total', $total);
    }



    /**
     * Gets order
     *
     * @return int
     * @throws EE_Error
     */
    public function order()
    {
        return $this->get('LIN_order');
    }



    /**
     * Sets order
     *
     * @param int $order
     * @throws EE_Error
     */
    public function set_order($order)
    {
        $this->set('LIN_order', $order);
    }



    /**
     * Gets parent
     *
     * @return int
     * @throws EE_Error
     */
    public function parent_ID()
    {
        return $this->get('LIN_parent');
    }



    /**
     * Sets parent
     *
     * @param int $parent
     * @throws EE_Error
     */
    public function set_parent_ID($parent)
    {
        $this->set('LIN_parent', $parent);
    }



    /**
     * Gets type
     *
     * @return string
     * @throws EE_Error
     */
    public function type()
    {
        return $this->get('LIN_type');
    }



    /**
     * Sets type
     *
     * @param string $type
     * @throws EE_Error
     */
    public function set_type($type)
    {
        $this->set('LIN_type', $type);
    }



    /**
     * Gets the line item of which this item is a composite. Eg, if this is a subtotal, the parent might be a total\
     * If this line item is saved to the DB, fetches the parent from the DB. However, if this line item isn't in the DB
     * it uses its cached reference to its parent line item (which would have been set by `EE_Line_Item::set_parent()`
     * or indirectly by `EE_Line_item::add_child_line_item()`)
     *
     * @return EE_Base_Class|EE_Line_Item
     * @throws EE_Error
     */
    public function parent()
    {
        return $this->ID()
            ? $this->get_model()->get_one_by_ID($this->parent_ID())
            : $this->_parent;
    }



    /**
     * Gets ALL the children of this line item (ie, all the parts that contribute towards this total).
     *
     * @return EE_Base_Class[]|EE_Line_Item[]
     * @throws EE_Error
     */
    public function children()
    {
        if ($this->ID()) {
            return $this->get_model()->get_all(
                array(
                    array('LIN_parent' => $this->ID()),
                    'order_by' => array('LIN_order' => 'ASC'),
                )
            );
        }
        if (! is_array($this->_children)) {
            $this->_children = array();
        }
        return $this->_children;
    }



    /**
     * Gets code
     *
     * @return string
     * @throws EE_Error
     */
    public function code()
    {
        return $this->get('LIN_code');
    }



    /**
     * Sets code
     *
     * @param string $code
     * @throws EE_Error
     */
    public function set_code($code)
    {
        $this->set('LIN_code', $code);
    }



    /**
     * Gets is_taxable
     *
     * @return boolean
     * @throws EE_Error
     */
    public function is_taxable()
    {
        return $this->get('LIN_is_taxable');
    }



    /**
     * Sets is_taxable
     *
     * @param boolean $is_taxable
     * @throws EE_Error
     */
    public function set_is_taxable($is_taxable)
    {
        $this->set('LIN_is_taxable', $is_taxable);
    }



    /**
     * Gets the object that this model-joins-to.
     * returns one of the model objects that the field OBJ_ID can point to... see the 'OBJ_ID' field on
     * EEM_Promotion_Object
     *
     *        Eg, if this line item join model object is for a ticket, this will return the EE_Ticket object
     *
     * @return EE_Base_Class | NULL
     * @throws EE_Error
     */
    public function get_object()
    {
        $model_name_of_related_obj = $this->OBJ_type();
        return $this->get_model()->has_relation($model_name_of_related_obj)
            ? $this->get_first_related($model_name_of_related_obj)
            : null;
    }



    /**
     * Like EE_Line_Item::get_object(), but can only ever actually return an EE_Ticket.
     * (IE, if this line item is for a price or something else, will return NULL)
     *
     * @param array $query_params
     * @return EE_Base_Class|EE_Ticket
     * @throws EE_Error
     */
    public function ticket($query_params = array())
    {
        //we're going to assume that when this method is called we always want to receive the attached ticket EVEN if that ticket is archived.  This can be overridden via the incoming $query_params argument
        $remove_defaults = array('default_where_conditions' => 'none');
        $query_params = array_merge($remove_defaults, $query_params);
        return $this->get_first_related('Ticket', $query_params);
    }



    /**
     * Gets the EE_Datetime that's related to the ticket, IF this is for a ticket
     *
     * @return EE_Datetime | NULL
     * @throws EE_Error
     */
    public function get_ticket_datetime()
    {
        if ($this->OBJ_type() === 'Ticket') {
            $ticket = $this->ticket();
            if ($ticket instanceof EE_Ticket) {
                $datetime = $ticket->first_datetime();
                if ($datetime instanceof EE_Datetime) {
                    return $datetime;
                }
            }
        }
        return null;
    }



    /**
     * Gets the event's name that's related to the ticket, if this is for
     * a ticket
     *
     * @return string
     * @throws EE_Error
     */
    public function ticket_event_name()
    {
        $event_name = esc_html__('Unknown', 'event_espresso');
        $event = $this->ticket_event();
        if ($event instanceof EE_Event) {
            $event_name = $event->name();
        }
        return $event_name;
    }


    /**
     * Gets the event that's related to the ticket, if this line item represents a ticket.
     *
     * @return EE_Event|null
     * @throws EE_Error
     */
    public function ticket_event()
    {
        $event = null;
        $ticket = $this->ticket();
        if ($ticket instanceof EE_Ticket) {
            $datetime = $ticket->first_datetime();
            if ($datetime instanceof EE_Datetime) {
                $event = $datetime->event();
            }
        }
        return $event;
    }



    /**
     * Gets the first datetime for this lien item, assuming it's for a ticket
     *
     * @param string $date_format
     * @param string $time_format
     * @return string
     * @throws EE_Error
     */
    public function ticket_datetime_start($date_format = '', $time_format = '')
    {
        $first_datetime_string = esc_html__('Unknown', 'event_espresso');
        $datetime = $this->get_ticket_datetime();
        if ($datetime) {
            $first_datetime_string = $datetime->start_date_and_time($date_format, $time_format);
        }
        return $first_datetime_string;
    }



    /**
     * Adds the line item as a child to this line item. If there is another child line
     * item with the same LIN_code, it is overwritten by this new one
     *
     * @param EEI_Line_Item $line_item
     * @param bool          $set_order
     * @return bool success
     * @throws EE_Error
     */
    public function add_child_line_item(EEI_Line_Item $line_item, $set_order = true)
    {
        // should we calculate the LIN_order for this line item ?
        if ($set_order || $line_item->order() === null) {
            $line_item->set_order(count($this->children()));
        }
        if ($this->ID()) {
            //check for any duplicate line items (with the same code), if so, this replaces it
            $line_item_with_same_code = $this->get_child_line_item($line_item->code());
            if ($line_item_with_same_code instanceof EE_Line_Item && $line_item_with_same_code !== $line_item) {
                $this->delete_child_line_item($line_item_with_same_code->code());
            }
            $line_item->set_parent_ID($this->ID());
            if ($this->TXN_ID()) {
                $line_item->set_TXN_ID($this->TXN_ID());
            }
            return $line_item->save();
        }
        $this->_children[$line_item->code()] = $line_item;
        if ($line_item->parent() !== $this) {
            $line_item->set_parent($this);
        }
        return true;
    }


    /**
     * Similar to EE_Base_Class::_add_relation_to, except this isn't a normal relation.
     * If this line item is saved to the DB, this is just a wrapper for set_parent_ID() and save()
     * However, if this line item is NOT saved to the DB, this just caches the parent on
     * the EE_Line_Item::_parent property.
     *
     * @param EE_Line_Item $line_item
     * @throws EE_Error
     */
    public function set_parent($line_item)
    {
        if ($this->ID()) {
            if (! $line_item->ID()) {
                $line_item->save();
            }
            $this->set_parent_ID($line_item->ID());
            $this->save();
        } else {
            $this->_parent = $line_item;
            $this->set_parent_ID($line_item->ID());
        }
    }



    /**
     * Gets the child line item as specified by its code. Because this returns an object (by reference)
     * you can modify this child line item and the parent (this object) can know about them
     * because it also has a reference to that line item
     *
     * @param string $code
     * @return EE_Base_Class|EE_Line_Item|EE_Soft_Delete_Base_Class|NULL
     * @throws EE_Error
     */
    public function get_child_line_item($code)
    {
        if ($this->ID()) {
            return $this->get_model()->get_one(
                array(array('LIN_parent' => $this->ID(), 'LIN_code' => $code))
            );
        }
        return isset($this->_children[$code])
            ? $this->_children[$code]
            : null;
    }



    /**
     * Returns how many items are deleted (or, if this item has not been saved ot the DB yet, just how many it HAD
     * cached on it)
     *
     * @return int
     * @throws EE_Error
     */
    public function delete_children_line_items()
    {
        if ($this->ID()) {
            return $this->get_model()->delete(array(array('LIN_parent' => $this->ID())));
        }
        $count = count($this->_children);
        $this->_children = array();
        return $count;
    }



    /**
     * If this line item has been saved to the DB, deletes its child with LIN_code == $code. If this line
     * HAS NOT been saved to the DB, removes the child line item with index $code.
     * Also searches through the child's children for a matching line item. However, once a line item has been found
     * and deleted, stops searching (so if there are line items with duplicate codes, only the first one found will be
     * deleted)
     *
     * @param string $code
     * @param bool   $stop_search_once_found
     * @return int count of items deleted (or simply removed from the line item's cache, if not has not been saved to
     *             the DB yet)
     * @throws EE_Error
     */
    public function delete_child_line_item($code, $stop_search_once_found = true)
    {
        if ($this->ID()) {
            $items_deleted = 0;
            if ($this->code() === $code) {
                $items_deleted += EEH_Line_Item::delete_all_child_items($this);
                $items_deleted += (int)$this->delete();
                if ($stop_search_once_found) {
                    return $items_deleted;
                }
            }
            foreach ($this->children() as $child_line_item) {
                $items_deleted += $child_line_item->delete_child_line_item($code, $stop_search_once_found);
            }
            return $items_deleted;
        }
        if (isset($this->_children[$code])) {
            unset($this->_children[$code]);
            return 1;
        }
        return 0;
    }


    /**
     * If this line item is in the database, is of the type subtotal, and
     * has no children, why do we have it? It should be deleted so this function
     * does that
     *
     * @return boolean
     * @throws EE_Error
     */
    public function delete_if_childless_subtotal()
    {
        if ($this->ID() && $this->type() === EEM_Line_Item::type_sub_total && ! $this->children()) {
            return $this->delete();
        }
        return false;
    }



    /**
     * Creates a code and returns a string. doesn't assign the code to this model object
     *
     * @return string
     * @throws EE_Error
     */
    public function generate_code()
    {
        // each line item in the cart requires a unique identifier
        return md5($this->get('OBJ_type') . $this->get('OBJ_ID') . microtime());
    }



    /**
     * @return bool
     * @throws EE_Error
     */
    public function is_tax()
    {
        return $this->type() === EEM_Line_Item::type_tax;
    }



    /**
     * @return bool
     * @throws EE_Error
     */
    public function is_tax_sub_total()
    {
        return $this->type() === EEM_Line_Item::type_tax_sub_total;
    }



    /**
     * @return bool
     * @throws EE_Error
     */
    public function is_line_item()
    {
        return $this->type() === EEM_Line_Item::type_line_item;
    }



    /**
     * @return bool
     * @throws EE_Error
     */
    public function is_sub_line_item()
    {
        return $this->type() === EEM_Line_Item::type_sub_line_item;
    }



    /**
     * @return bool
     * @throws EE_Error
     */
    public function is_sub_total()
    {
        return $this->type() === EEM_Line_Item::type_sub_total;
    }



    /**
     * Whether or not this line item is a cancellation line item
     *
     * @return boolean
     * @throws EE_Error
     */
    public function is_cancellation()
    {
        return EEM_Line_Item::type_cancellation === $this->type();
    }



    /**
     * @return bool
     * @throws EE_Error
     */
    public function is_total()
    {
        return $this->type() === EEM_Line_Item::type_total;
    }



    /**
     * @return bool
     * @throws EE_Error
     */
    public function is_cancelled()
    {
        return $this->type() === EEM_Line_Item::type_cancellation;
    }



    /**
     * @return string like '2, 004.00', formatted according to the localized currency
     * @throws EE_Error
     */
    public function unit_price_no_code()
    {
        return $this->get_pretty('LIN_unit_price', 'no_currency_code');
    }



    /**
     * @return string like '2, 004.00', formatted according to the localized currency
     * @throws EE_Error
     */
    public function total_no_code()
    {
        return $this->get_pretty('LIN_total', 'no_currency_code');
    }



    /**
     * Gets the final total on this item, taking taxes into account.
     * Has the side-effect of setting the sub-total as it was just calculated.
     * If this is used on a grand-total line item, also updates the transaction's
     * TXN_total (provided this line item is allowed to persist, otherwise we don't
     * want to change a persistable transaction with info from a non-persistent line item)
     *
     * @return float
     * @throws EE_Error
     * @throws InvalidArgumentException
     * @throws InvalidInterfaceException
     * @throws InvalidDataTypeException
     */
    public function recalculate_total_including_taxes()
    {
        $pre_tax_total = $this->recalculate_pre_tax_total();
        $tax_total = $this->recalculate_taxes_and_tax_total();
        $total = $pre_tax_total + $tax_total;
        // no negative totals plz
        $total = max($total, 0);
        $this->set_total($total);
        //only update the related transaction's total
        //if we intend to save this line item and its a grand total
        if (
            $this->allow_persist() && $this->type() === EEM_Line_Item::type_total
            && $this->transaction()
               instanceof
               EE_Transaction
        ) {
            $this->transaction()->set_total($total);
            if ($this->transaction()->ID()) {
                $this->transaction()->save();
            }
        }
        $this->maybe_save();
        return $total;
    }


    /**
     * Recursively goes through all the children and recalculates sub-totals EXCEPT for
     * tax-sub-totals (they're a an odd beast). Updates the 'total' on each line item according to either its
     * unit price * quantity or the total of all its children EXCEPT when we're only calculating the taxable total and
     * when this is called on the grand total
     *
     * @return float
     * @throws InvalidArgumentException
     * @throws InvalidInterfaceException
     * @throws InvalidDataTypeException
     * @throws EE_Error
     */
    public function recalculate_pre_tax_total()
    {
        $total = 0;
        $my_children = $this->children();
        $has_children = ! empty($my_children);
        if ($has_children && $this->is_line_item()) {
            $total = $this->_recalculate_pretax_total_for_line_item($total, $my_children);
        } elseif (! $has_children && ($this->is_sub_line_item() || $this->is_line_item())) {
            $total = $this->unit_price() * $this->quantity();
        } elseif ($this->is_sub_total() || $this->is_total()) {
            $total = $this->_recalculate_pretax_total_for_subtotal($total, $my_children);
        } elseif ($this->is_tax_sub_total() || $this->is_tax() || $this->is_cancelled()) {
            // completely ignore tax totals, tax sub-totals, and cancelled line items, when calculating the pre-tax-total
            return 0;
        }
        // ensure all non-line items and non-sub-line-items have a quantity of 1 (except for Events)
        if (
            ! $this->is_line_item() && ! $this->is_sub_line_item() && ! $this->is_cancellation()
        ) {
            if ($this->OBJ_type() !== 'Event') {
                $this->set_quantity(1);
            }
            if (! $this->is_percent()) {
                $this->set_unit_price($total);
            }
        }
        //we don't want to bother saving grand totals, because that needs to factor in taxes anyways
        //so it ought to be
        if (! $this->is_total()) {
            $this->set_total($total);
            //if not a percent line item, make sure we keep the unit price in sync
            if (
                $has_children
                && $this->is_line_item()
                && ! $this->is_percent()
            ) {
                if ($this->quantity() === 0) {
                    $new_unit_price = 0;
                } else {
                    $new_unit_price = $this->total() / $this->quantity();
                }
                $this->set_unit_price($new_unit_price);
            }
            $this->maybe_save();
        }
        return $total;
    }



    /**
     * Calculates the pretax total when this line item is a subtotal or total line item.
     * Basically does a sum-then-round approach (ie, any percent line item that are children
     * will calculate their total based on the un-rounded total we're working with so far, and
     * THEN round the result; instead of rounding as we go like with sub-line-items)
     *
     * @param float          $calculated_total_so_far
     * @param EE_Line_Item[] $my_children
     * @return float
     * @throws InvalidArgumentException
     * @throws InvalidInterfaceException
     * @throws InvalidDataTypeException
     * @throws EE_Error
     */
    protected function _recalculate_pretax_total_for_subtotal($calculated_total_so_far, $my_children = null)
    {
        if ($my_children === null) {
            $my_children = $this->children();
        }
        //get the total of all its children
        foreach ($my_children as $child_line_item) {
            if ($child_line_item instanceof EE_Line_Item && ! $child_line_item->is_cancellation()) {
                // percentage line items are based on total so far
                if ($child_line_item->is_percent()) {
                    //round as we go so that the line items add up ok
                    $percent_total = round(
                        $calculated_total_so_far * $child_line_item->percent() / 100,
                        EE_Registry::instance()->CFG->currency->dec_plc
                    );
                    $child_line_item->set_total($percent_total);
                    //so far all percent line items should have a quantity of 1
                    //(ie, no double percent discounts. Although that might be requested someday)
                    $child_line_item->set_quantity(1);
                    $child_line_item->maybe_save();
                    $calculated_total_so_far += $percent_total;
                } else {
                    //verify flat sub-line-item quantities match their parent
                    if ($child_line_item->is_sub_line_item()) {
                        $child_line_item->set_quantity($this->quantity());
                    }
                    $calculated_total_so_far += $child_line_item->recalculate_pre_tax_total();
                }
            }
        }
        if ($this->is_sub_total()) {
            // no negative totals plz
            $calculated_total_so_far = max($calculated_total_so_far, 0);
        }
        return $calculated_total_so_far;
    }



    /**
     * Calculates the pretax total for a normal line item, in a round-then-sum approach
     * (where each sub-line-item is applied to the base price for the line item
     * and the result is immediately rounded, rather than summing all the sub-line-items
     * then rounding, like we do when recalculating pretax totals on totals and subtotals).
     *
     * @param float          $calculated_total_so_far
     * @param EE_Line_Item[] $my_children
     * @return float
     * @throws InvalidArgumentException
     * @throws InvalidInterfaceException
     * @throws InvalidDataTypeException
     * @throws EE_Error
     */
    protected function _recalculate_pretax_total_for_line_item($calculated_total_so_far, $my_children = null)
    {
        if ($my_children === null) {
            $my_children = $this->children();
        }
        //we need to keep track of the running total for a single item,
        //because we need to round as we go
        $unit_price_for_total = 0;
        $quantity_for_total = 1;
        //get the total of all its children
        foreach ($my_children as $child_line_item) {
            if ($child_line_item instanceof EE_Line_Item && ! $child_line_item->is_cancellation()) {
                if ($child_line_item->is_percent()) {
                    //it should be the unit-price-so-far multiplied by teh percent multiplied by the quantity
                    //not total multiplied by percent, because that ignores rounding along-the-way
                    $percent_unit_price = round(
                        $unit_price_for_total * $child_line_item->percent() / 100,
                        EE_Registry::instance()->CFG->currency->dec_plc
                    );
                    $percent_total = $percent_unit_price * $quantity_for_total;
                    $child_line_item->set_total($percent_total);
                    //so far all percent line items should have a quantity of 1
                    //(ie, no double percent discounts. Although that might be requested someday)
                    $child_line_item->set_quantity(1);
                    $child_line_item->maybe_save();
                    $calculated_total_so_far += $percent_total;
                    $unit_price_for_total += $percent_unit_price;
                } else {
                    //verify flat sub-line-item quantities match their parent
                    if ($child_line_item->is_sub_line_item()) {
                        $child_line_item->set_quantity($this->quantity());
                    }
                    $quantity_for_total = $child_line_item->quantity();
                    $calculated_total_so_far += $child_line_item->recalculate_pre_tax_total();
                    $unit_price_for_total += $child_line_item->unit_price();
                }
            }
        }
        return $calculated_total_so_far;
    }



    /**
     * Recalculates the total on each individual tax (based on a recalculation of the pre-tax total), sets
     * the totals on each tax calculated, and returns the final tax total
     *
     * @return float
     * @throws EE_Error
     */
    public function recalculate_taxes_and_tax_total()
    {
        //get all taxes
        $taxes = $this->tax_descendants();
        //calculate the pretax total
        $taxable_total = $this->taxable_total();
        $tax_total = 0;
        foreach ($taxes as $tax) {
            $total_on_this_tax = $taxable_total * $tax->percent() / 100;
            //remember the total on this line item
            $tax->set_total($total_on_this_tax);
            $tax_total += $tax->total();
        }
        $this->_recalculate_tax_sub_total();
        return $tax_total;
    }



    /**
     * Simply forces all the tax-sub-totals to recalculate. Assumes the taxes have been calculated
     *
     * @return void
     * @throws EE_Error
     */
    private function _recalculate_tax_sub_total()
    {
        if ($this->is_tax_sub_total()) {
            $total = 0;
            $total_percent = 0;
            //simply loop through all its children (which should be taxes) and sum their total
            foreach ($this->children() as $child_tax) {
                if ($child_tax instanceof EE_Line_Item) {
                    $total += $child_tax->total();
                    $total_percent += $child_tax->percent();
                }
            }
            $this->set_total($total);
            $this->set_percent($total_percent);
        } elseif ($this->is_total()) {
            foreach ($this->children() as $maybe_tax_subtotal) {
                if ($maybe_tax_subtotal instanceof EE_Line_Item) {
                    $maybe_tax_subtotal->_recalculate_tax_sub_total();
                }
            }
        }
    }



    /**
     * Gets the total tax on this line item. Assumes taxes have already been calculated using
     * recalculate_taxes_and_total
     *
     * @return float
     * @throws EE_Error
     */
    public function get_total_tax()
    {
        $this->_recalculate_tax_sub_total();
        $total = 0;
        foreach ($this->tax_descendants() as $tax_line_item) {
            if ($tax_line_item instanceof EE_Line_Item) {
                $total += $tax_line_item->total();
            }
        }
        return $total;
    }


    /**
     * Gets the total for all the items purchased only
     *
     * @return float
     * @throws EE_Error
     */
    public function get_items_total()
    {
        //by default, let's make sure we're consistent with the existing line item
        if ($this->is_total()) {
            $pretax_subtotal_li = EEH_Line_Item::get_pre_tax_subtotal($this);
            if ($pretax_subtotal_li instanceof EE_Line_Item) {
                return $pretax_subtotal_li->total();
            }
        }
        $total = 0;
        foreach ($this->get_items() as $item) {
            if ($item instanceof EE_Line_Item) {
                $total += $item->total();
            }
        }
        return $total;
    }



    /**
     * Gets all the descendants (ie, children or children of children etc) that
     * are of the type 'tax'
     *
     * @return EE_Line_Item[]
     */
    public function tax_descendants()
    {
        return EEH_Line_Item::get_tax_descendants($this);
    }



    /**
     * Gets all the real items purchased which are children of this item
     *
     * @return EE_Line_Item[]
     */
    public function get_items()
    {
        return EEH_Line_Item::get_line_item_descendants($this);
    }



    /**
     * Returns the amount taxable among this line item's children (or if it has no children,
     * how much of it is taxable). Does not recalculate totals or subtotals.
     * If the taxable total is negative, (eg, if none of the tickets were taxable,
     * but there is a "Taxable" discount), returns 0.
     *
     * @return float
     * @throws EE_Error
     */
    public function taxable_total()
    {
        $total = 0;
        if ($this->children()) {
            foreach ($this->children() as $child_line_item) {
                if ($child_line_item->type() === EEM_Line_Item::type_line_item && $child_line_item->is_taxable()) {
                    //if it's a percent item, only take into account the percent
                    //that's taxable too (the taxable total so far)
                    if ($child_line_item->is_percent()) {
                        $total += ($total * $child_line_item->percent() / 100);
                    } else {
                        $total += $child_line_item->total();
                    }
                } elseif ($child_line_item->type() === EEM_Line_Item::type_sub_total) {
                    $total += $child_line_item->taxable_total();
                }
            }
        }
        return max($total, 0);
    }



    /**
     * Gets the transaction for this line item
     *
     * @return EE_Base_Class|EE_Transaction
     * @throws EE_Error
     */
    public function transaction()
    {
        return $this->get_first_related('Transaction');
    }



    /**
     * Saves this line item to the DB, and recursively saves its descendants.
     * Because there currently is no proper parent-child relation on the model,
     * save_this_and_cached() will NOT save the descendants.
     * Also sets the transaction on this line item and all its descendants before saving
     *
     * @param int $txn_id if none is provided, assumes $this->TXN_ID()
     * @return int count of items saved
     * @throws EE_Error
     */
    public function save_this_and_descendants_to_txn($txn_id = null)
    {
        $count = 0;
        if (! $txn_id) {
0   == false // true
0   == null  // true
123 == false // false
123 == null  // false

// It is often better to use strict comparison
0 === false // false
0 === null  // false
            $txn_id = $this->TXN_ID();
        }
        $this->set_TXN_ID($txn_id);
        $children = $this->children();
        $count += $this->save()
            ? 1
            : 0;
        foreach ($children as $child_line_item) {
            if ($child_line_item instanceof EE_Line_Item) {
                $child_line_item->set_parent_ID($this->ID());
                $count += $child_line_item->save_this_and_descendants_to_txn($txn_id);
            }
        }
        return $count;
    }



    /**
     * Saves this line item to the DB, and recursively saves its descendants.
     *
     * @return int count of items saved
     * @throws EE_Error
     */
    public function save_this_and_descendants()
    {
        $count = 0;
        $children = $this->children();
        $count += $this->save()
            ? 1
            : 0;
        foreach ($children as $child_line_item) {
            if ($child_line_item instanceof EE_Line_Item) {
                $child_line_item->set_parent_ID($this->ID());
                $count += $child_line_item->save_this_and_descendants();
            }
        }
        return $count;
    }



    /**
     * returns the cancellation line item if this item was cancelled
     *
     * @return EE_Line_Item[]
     * @throws InvalidArgumentException
     * @throws InvalidInterfaceException
     * @throws InvalidDataTypeException
     * @throws ReflectionException
     * @throws EE_Error
     */
    public function get_cancellations()
    {
        EE_Registry::instance()->load_helper('Line_Item');
        return EEH_Line_Item::get_descendants_of_type($this, EEM_Line_Item::type_cancellation);
    }



    /**
     * If this item has an ID, then this saves it again to update the db
     *
     * @return int count of items saved
     * @throws EE_Error
     */
    public function maybe_save()
    {
        if ($this->ID()) {
            return $this->save();
        }
        return false;
    }


    /**
     * clears the cached children and parent from the line item
     *
     * @return void
     */
    public function clear_related_line_item_cache()
    {
        $this->_children = array();
        $this->_parent = null;
    }



    /**
     * @param bool $raw
     * @return int
     * @throws EE_Error
     */
    public function timestamp($raw = false)
    {
        return $raw
            ? $this->get_raw('LIN_timestamp')
            : $this->get('LIN_timestamp');
    }




    /************************* DEPRECATED *************************/
    /**
     * @deprecated 4.6.0
     * @param string $type one of the constants on EEM_Line_Item
     * @return EE_Line_Item[]
     */
    protected function _get_descendants_of_type($type)
    {
        EE_Error::doing_it_wrong(
            'EE_Line_Item::_get_descendants_of_type()',
            __('Method replaced with EEH_Line_Item::get_descendants_of_type()', 'event_espresso'), '4.6.0'
        );
        return EEH_Line_Item::get_descendants_of_type($this, $type);
    }



    /**
     * @deprecated 4.6.0
     * @param string $type like one of the EEM_Line_Item::type_*
     * @return EE_Line_Item
     */
    public function get_nearest_descendant_of_type($type)
    {
        EE_Error::doing_it_wrong(
            'EE_Line_Item::get_nearest_descendant_of_type()',
            __('Method replaced with EEH_Line_Item::get_nearest_descendant_of_type()', 'event_espresso'), '4.6.0'
        );
        return EEH_Line_Item::get_nearest_descendant_of_type($this, $type);
    }



}

eventespresso / event-espresso-core
