<?php

/**
 * E2pdf Action Model
 * 
 * @copyright  Copyright 2017 https://e2pdf.com
 * @license    GPL v2
 * @version    1
 * @link       https://e2pdf.com
 * @since      0.01.63
 */
if (!defined('ABSPATH')) {
    die('Access denied.');
}

class Model_E2pdf_Action extends Model_E2pdf_Model {

    private $extension;

    function __construct() {
        parent::__construct();
    }

    public function load($extension) {
        $this->extension = $extension;
    }

    public function process_actions($page) {
        if (!$page || !$this->extension) {
            return $page;
        }

        if (isset($page['actions']) && !empty($page['actions'])) {
            foreach ($page['actions'] as $action) {
                $page = $this->process_action($page, $action);
            }
            if (isset($page['hidden']) && $page['hidden']) {
                $page = false;
            }
        }

        if ($page) {
            if (!empty($page['elements'])) {
                foreach ($page['elements'] as $el_key => $el_value) {
                    if (isset($el_value['actions']) && !empty($el_value['actions'])) {
                        foreach ($el_value['actions'] as $action) {
                            $el_value = $this->process_action($el_value, $action);
                        }
                        $page['elements'][$el_key] = $el_value;
                        if (isset($el_value['hidden']) && $el_value['hidden']) {
                            unset($page['elements'][$el_key]);
                            break;
                        }
                    }
                }
            }
        }

        return $page;
    }

    private function process_action($element, $action) {

        $apply = false;
        if (isset($action['conditions']) && !empty($action['conditions'])) {
            foreach ($action['conditions'] as $condition) {
                $apply = $this->process_condition($condition);
                if ($action['apply'] == 'any' && $apply) {
                    break;
                } elseif ($action['apply'] == 'all' && !$apply) {
                    break;
                }
            }
        }

        if ($apply) {
            $element = $this->apply_action($element, $action);
        }

        return $element;
    }

    private function process_condition($condition) {

        $result = false;

        $if = $this->extension->render($condition['if']);
        $value = $this->extension->render($condition['value']);

        switch ($condition['condition']) {
            case '=':
                $result = $if == $value ? true : false;
                break;

            case '!=':
                $result = $if != $value ? true : false;
                break;

            case '>':
                $result = $if > $value ? true : false;
                break;

            case '>=':
                $result = $if >= $value ? true : false;
                break;

            case '<':
                $result = $if < $value ? true : false;
                break;

            case '<=':
                $result = $if <= $value ? true : false;
                break;

            case 'like':
                $result = strpos($if, $value) !== false ? true : false;
                break;

            case 'not_like':
                $result = strpos($if, $value) === false ? true : false;
                break;
        }

        return $result;
    }

    private function apply_action($element, $action) {
        if ($action['action'] == 'hide') {
            $element['hidden'] = true;
        } elseif ($action['action'] == 'show') {
            $element['hidden'] = false;
        } elseif ($action['action'] == 'change' && $action['property']) {

            $number_properties = array(
                'width', 'height', 'left', 'top'
            );

            $not_properties = array(
                'top', 'left', 'width', 'height', 'value'
            );

            $change = $this->extension->render($action['change']);

            if ((substr($change, 0, 1) === "+" || substr($change, 0, 1) === "-") && in_array($action['property'], $number_properties)) {
                if (isset($element['element_id'])) {
                    $value = isset($element[$action['property']]) ? $element[$action['property']] : 0;
                } else {
                    $value = isset($element['properties'][$action['property']]) ? $element['properties'][$action['property']] : 0;
                }

                $change = $value + floatval($change);
            }

            if (in_array($action['property'], $not_properties) && isset($element['element_id'])) {
                $element[$action['property']] = $change;
            } else {
                $element['properties'][$action['property']] = $change;
            }
        }

        return $element;
    }

}