class ManyToOne

class ManyToOne extends ArgumentPluginBase {
    
    /**
     * {@inheritdoc}
     */
    public function init(ViewExecutable $view, DisplayPluginBase $display, array &$options = NULL) {
        parent::init($view, $display, $options);
        $this->helper = new ManyToOneHelper($this);
        // Ensure defaults for these, during summaries and stuff:
        $this->operator = 'or';
        $this->value = [];
    }
    protected function defineOptions() {
        $options = parent::defineOptions();
        $options['break_phrase'] = [
            'default' => FALSE,
        ];
        $options['add_table'] = [
            'default' => FALSE,
        ];
        $options['require_value'] = [
            'default' => FALSE,
        ];
        if (isset($this->helper)) {
            $this->helper
                ->defineOptions($options);
        }
        else {
            $helper = new ManyToOneHelper($this);
            $helper->defineOptions($options);
        }
        return $options;
    }
    public function buildOptionsForm(&$form, FormStateInterface $form_state) {
        parent::buildOptionsForm($form, $form_state);
        // allow + for or, , for and
        $form['break_phrase'] = [
            '#type' => 'checkbox',
            '#title' => $this->t('Allow multiple values'),
            '#description' => $this->t('If selected, users can enter multiple values in the form of 1+2+3 (for OR) or 1,2,3 (for AND).'),
            '#default_value' => !empty($this->options['break_phrase']),
            '#group' => 'options][more',
        ];
        $form['add_table'] = [
            '#type' => 'checkbox',
            '#title' => $this->t('Allow multiple filter values to work together'),
            '#description' => $this->t('If selected, multiple instances of this filter can work together, as though multiple values were supplied to the same filter. This setting is not compatible with the "Reduce duplicates" setting.'),
            '#default_value' => !empty($this->options['add_table']),
            '#group' => 'options][more',
        ];
        $form['require_value'] = [
            '#type' => 'checkbox',
            '#title' => $this->t('Do not display items with no value in summary'),
            '#default_value' => !empty($this->options['require_value']),
            '#group' => 'options][more',
        ];
        $this->helper
            ->buildOptionsForm($form, $form_state);
    }
    
    /**
     * {@inheritdoc}
     */
    public function ensureMyTable() {
        $this->helper
            ->ensureMyTable();
    }
    public function query($group_by = FALSE) {
        $empty = FALSE;
        if (isset($this->definition['zero is null']) && $this->definition['zero is null']) {
            if (empty($this->argument)) {
                $empty = TRUE;
            }
        }
        else {
            if (!isset($this->argument)) {
                $empty = TRUE;
            }
        }
        if ($empty) {
            parent::ensureMyTable();
            $this->query
                ->addWhere(0, "{$this->tableAlias}.{$this->realField}", NULL, 'IS NULL');
            return;
        }
        if (!empty($this->options['break_phrase'])) {
            $force_int = !empty($this->definition['numeric']);
            $this->unpackArgumentValue($force_int);
        }
        else {
            $this->value = [
                $this->argument,
            ];
            $this->operator = 'or';
        }
        $this->helper
            ->addFilter();
    }
    public function title() {
        if (!$this->argument) {
            return !empty($this->definition['empty field name']) ? $this->definition['empty field name'] : $this->t('Uncategorized');
        }
        if (!empty($this->options['break_phrase'])) {
            $force_int = !empty($this->definition['numeric']);
            $this->unpackArgumentValue($force_int);
        }
        else {
            $this->value = [
                $this->argument,
            ];
            $this->operator = 'or';
        }
        // @todo -- both of these should check definition for alternate keywords.
        if (empty($this->value)) {
            return !empty($this->definition['empty field name']) ? $this->definition['empty field name'] : $this->t('Uncategorized');
        }
        if ($this->value === [
            -1,
        ]) {
            return !empty($this->definition['invalid input']) ? $this->definition['invalid input'] : $this->t('Invalid input');
        }
        return implode($this->operator == 'or' ? ' + ' : ', ', $this->titleQuery());
    }
    protected function summaryQuery() {
        $field = $this->table . '.' . $this->field;
        $join = $this->getJoin();
        if (!empty($this->options['require_value'])) {
            $join->type = 'INNER';
        }
        if (empty($this->options['add_table']) || empty($this->view->many_to_one_tables[$field])) {
            $this->tableAlias = $this->query
                ->ensureTable($this->table, $this->relationship, $join);
        }
        else {
            $this->tableAlias = $this->helper
                ->summaryJoin();
        }
        // Add the field.
        $this->base_alias = $this->query
            ->addField($this->tableAlias, $this->realField);
        $this->summaryNameField();
        return $this->summaryBasics();
    }
    public function summaryArgument($data) {
        $value = $data->{$this->base_alias};
        if (empty($value)) {
            $value = 0;
        }
        return $value;
    }
    
    /**
     * Override for specific title lookups.
     */
    public function titleQuery() {
        return $this->value;
    }

}