<?php

class FormBuilder
{
	const FORM_DIR = __DIR__.'/../templates/form/';

	private $class_name;
	private $table_name;
	private $identifier;

	private $title;
	private $form_inputs;
	private $form_action;
	private $submit_button_title;
	private $bt_action_suffix = '';

	public function __construct($class_name, $table_name, $identifier, $form_action)
	{
		$this->class_name = $class_name;
		$this->table_name = $table_name;
		$this->identifier = $identifier;
		$this->form_action = $form_action;
	}

	public function setTitle($title)
	{
		$this->title = $title;
	}

	public function setSubmitButton($title)
	{
		$this->submit_button_title = $title; 
	}

	public function setFields($fields)
	{
		$this->form_inputs = $fields;
	}

	public function display(&$smarty, $langs, $obj)
	{
		global $cookie;

		$this->prepareFieldsToDisplay($obj, $langs);

		$smarty_params = [
			'current_id_lang' => $cookie->id_lang,
			'langs' => $langs,
			'page_title' => $this->title,
			'form_action'=> $this->urlFormAction($this->form_action),
			'form_inputs'=> $this->form_inputs,
			'id_name' => $this->identifier,
			'id' => $obj->id,
			'module_dir' => _MODULE_DIR_,
			'button_submit' => [
				'name' => $this->submitName($this->form_action),
				'value' => $this->submit_button_title 
				]
			];
		$smarty->assign($smarty_params);

		echo $smarty->fetch(self::FORM_DIR.'form_edit.tpl');

	}

	private function prepareFieldsToDisplay($obj, $langs)
	{
		global $cookie;
		foreach ($this->form_inputs as $key => &$field) {
			$field['name'] = $key;
			$field['value'] = '';
			$field['html_attrs'] = '';

			$this->prepareTemplatePath($field);
			$this->prepareInputHtmlAttributes($field);
			$this->prepareSelectOptions($field);
			$this->prepareTinyMCE($field, $cookie);
			$this->updateValueFields($field, $obj, $key, $langs);
		}
	}

	private function prepareTemplatePath(&$field)
	{
		$field['template'] = self::FORM_DIR.$field['type'].'.tpl';
	}

	private function prepareInputHtmlAttributes(&$field)
	{
		if (isset($field['attrs']) && is_array($field['attrs'])) {
			$html_attrs = '';
			foreach($field['attrs'] as $key => $value) {
				$html_attrs .= " $key = \"".$value."\"";
			}				
			$field['html_attrs'] = $html_attrs;		
		}
	}

	private function prepareSelectOptions(&$field)
	{
		if (isset($field['options_raw']) && isset($field['options_map'])) {
			$level_prefix = '&mdash;';
			if (isset($field['level_prefix'])) {
				$level_prefix = $field['level_prefix'];
			}

			$rows = $field['options_raw'];
			$keys = $field['options_map'];

			$options = [];
			foreach($rows as $row) {
				$options_row['value'] = $row[$keys[0]];
				$options_row['label'] = $row[$keys[1]];

				if (!empty($level_prefix) && $row[$keys[2]]) {
					$options_row['label'] = str_repeat($level_prefix, $row[$keys[2]])
						.' '.$options_row['label'];
				}

				$options[] = $options_row;
			}
			$field['options'] = $options;
		}
	}


	private function updateValueFields(&$field, $obj, $key, $langs)
	{
		if (!isset($field['initial_value'])) {
			$field['initial_value'] = '';
		}

		$value = &$field['value'];
		if (isset($field['translatable']) && $field['translatable']==true) {
			foreach ($langs as $lang) {
				$val = $this->getFieldValue($obj, $key, $field['initial_value'], $lang['id_lang']);
				$value[$lang['id_lang']] = htmlentities(
					$val, 
					ENT_COMPAT, 
					'UTF-8'
					);
			}	
		}
		else {
			$field['value'] = $this->getFieldValue($obj, $key, $field['initial_value'], null);
		}
	}

	private function prepareTinyMCE(&$field, $cookie)
	{
		if ('textarea_tinymce' == $field['type']) {
			$iso = Language::getIsoById((int)($cookie->id_lang));
			$field['iso'] = (file_exists(_PS_ROOT_DIR_.'/js/tiny_mce/langs/'.$iso.'.js') ? $iso : 'en');
			$field['ad'] = dirname($_SERVER["PHP_SELF"]);
			$field['path_theme_css'] = _THEME_CSS_DIR_;
			$field['base_uri'] = __PS_BASE_URI__;
		}
	}

	private function urlFormAction($submit_action)
	{
		global $currentIndex;
		return $currentIndex
			.'&token='.Tools::getAdminTokenLite($this->class_name)
			.'&submit'.$submit_action.$this->table_name.'=1'
			;
	}


	private function submitName($submit_action)
	{
		return 'submit'.$submit_action.$this->table_name.$this->bt_action_suffix;
	}

	public function enableSubmitAndBackToParent()
	{
		$this->bt_action_suffix = 'AndBackToParent';
	}

	private function getFieldValue($obj, $key, $initial_value, $id_lang = NULL)
	{
		if ($id_lang)
			$defaultValue = ($obj->id AND isset($obj->{$key}[$id_lang])) ? $obj->{$key}[$id_lang] : $initial_value;
		else
			$defaultValue = isset($obj->{$key}) ? $obj->{$key} : $initial_value;

		return Tools::getValue($key.($id_lang ? '_'.$id_lang : ''), $defaultValue);
	}
	

}