<?php

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final class NF_Conversion_Calculations implements NF_Conversion

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{

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private $operations = array(

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'add' => '+',

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'subtract' => '-',

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'multiply' => '*',

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'divide' => '/'

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);

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private $form = array();

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private $tax_rate;

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public function __construct( $form_data )

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{

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$this->form = $form_data;

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}

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public function run()

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{

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// Extract Calculations from Fields

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foreach( $this->form[ 'fields' ] as $key => $field ){

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if( 'tax' == $field[ 'type' ] ){

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$this->set_tax( $field[ 'default_value' ] );

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continue;

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}

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if( 'calc' != $field[ 'type' ] ) continue;

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$calculation = array(

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'order' => $key,

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'name' => $field[ 'key' ],

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'eq' => '',

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'dec' => $field[ 'calc_places' ]

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);

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switch( $field[ 'calc_method' ] ){

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case 'eq':

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$calculation[ 'eq' ] = $field[ 'calc_eq' ];

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break;

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case 'fields':

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$calculation[ 'eq' ] = trim( array_reduce( $field[ 'calc' ], array( $this, 'reduce_operations' ), '' ) );

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break;

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case 'auto':

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$calculation[ 'eq' ] = trim( array_reduce( $this->form[ 'fields' ], array( $this, 'reduce_auto_total' ), '' ) );

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break;

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}

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// Remove any leading `+`.

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$calculation[ 'eq' ] = ltrim( $calculation[ 'eq' ], '+' );

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// Handle opinionated "Total" calc and tax field.

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if( 'total' == $field[ 'calc_name' ] && isset( $this->tax_rate ) ){

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$calculation[ 'eq' ] = "( {$calculation[ 'eq' ]} ) * {$this->tax_rate}";

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}

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$this->form[ 'settings' ][ 'calculations' ][] = $calculation;

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}

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// Replace Field IDs with Merge Tags

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if( isset( $this->form[ 'settings' ][ 'calculations' ] ) ) {

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foreach ($this->form['fields'] as $field) {

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if( ! isset( $field[ 'id' ] ) ) continue;

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$search = 'field_' . $field['id'];

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$replace = $this->merge_tag( $field );

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foreach ($this->form['settings']['calculations'] as $key => $calculation) {

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$this->form['settings']['calculations'][ $key ]['eq'] = str_replace($search, $replace, $calculation['eq']);

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}

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}

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}

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// Convert Calc Fields to HTML Fields for displaying Calculations

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foreach( $this->form[ 'fields' ] as $key => $field ){

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if( 'tax' == $field[ 'type' ] ){

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$this->form[ 'fields' ][ $key ][ 'type' ] = 'html';

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$this->form[ 'fields' ][ $key ][ 'default' ] = "<strong>{$field[ 'label' ]}</strong><br /> {$field[ 'default_value' ]}";

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continue;

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}

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if( 'calc' != $field[ 'type' ] ) continue;

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$this->form[ 'fields' ][ $key ][ 'type' ] = 'html';

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if( 'html' == $field[ 'calc_display_type' ] ){

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// TODO: HTML Output fields seem to loose the label.

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$search = '[ninja_forms_calc]';

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$replace = $this->merge_tag( $field );

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$subject = $field[ 'calc_display_html' ];

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$this->form[ 'fields' ][ $key ][ 'default' ] = str_replace( $search, $replace, $subject );

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} else {

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$this->form[ 'fields' ][ $key ][ 'default' ] = '<strong>' . $field[ 'label' ] . '</strong><br />' . $this->merge_tag( $field );

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}

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}

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return $this->form;

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}

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private function reduce_operations( $eq, $calc )

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{

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$operation = $calc[ 'op' ];

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return ' ' . $eq . $this->operations[ $operation ] . ' field_' . $calc[ 'field' ] . ' ';

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}

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private function reduce_auto_total( $eq, $field )

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{

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if( ! isset( $field[ 'calc_auto_include' ] ) || 1 != $field[ 'calc_auto_include' ] ) return $eq;

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return $eq . '+ {field:' . $field[ 'key' ] . ':calc} ';

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}

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private function merge_tag( $field )

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{

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$tag = $field[ 'key' ];

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if( 'calc' == $field[ 'type' ] ){

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return '{calc:' . $tag . '}';

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} else {

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return '{field:' . $tag . ':calc}';

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}

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}

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/**

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* Sets a float formatted tax rate.

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* @param string|int|float $tax

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*

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* @return float|int

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*/

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private function set_tax( $tax )

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{

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// ex 15% -> 1.15

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return $this->tax_rate = ( floatval( $tax ) + 100 ) / 100;

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}

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}

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add_filter( 'ninja_forms_after_upgrade_settings', 'ninja_forms_conversion_calculations' );

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function ninja_forms_conversion_calculations( $form_data ){

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$conversion = new NF_Conversion_Calculations( $form_data );

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return $conversion->run();

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}

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