<?php

namespace Qs\Form\SubForm;

use Exception;
use Qs\Form\FixTrait;
use Qs\Form\ResourceInterface;
use Qs\Form\SubForm\Table\Row;
use Qs\Html;
use Qs_Array;
use Qs_Form_SubForm;
use Zend_Form_Element;

class Table extends \Qs_Form_SubForm
{
    use FixTrait;
    use TableOptionsTrait;

    const ORIENTATION_HORIZONTAL = 'horizontal';
    const ORIENTATION_VERTICAL = 'vertical';

    const EMPTY_LIST = 'emptyList';

    protected $_text = [
        self::EMPTY_LIST => 'Empty List',
    ];

    protected $_enabledHeaders = true;
    protected $_label;
    protected $_startIndex = 0;
    protected $_itemName;
    protected $_itemsName;
    protected $_maxItems;
    protected $_itemClass;
    protected $_itemOptions = [];
    protected $_required;
    protected $_description;
    protected $_columnsCount;
    protected $_itemSubForm;
    protected $_tableAttribs = [];

    public function init()
    {
        $this->addScript('js/qs/form/subform/table.js');
        return parent::init();
    }

    public function getLabel()
    {
        return $this->_label;
    }

    public function setLabel($label)
    {
        $this->_label = $label;
        return $this;
    }

    public function setText($name, $text)
    {
        $this->_text[$name] = $text;
        return $this;
    }

    public function getText($name)
    {
        return Qs_Array::get($this->_text, $name);
    }

    public function isEnabledHeaders()
    {
        return $this->_enabledHeaders;
    }

    public function setEnabledHeaders($flag)
    {
        $this->_enabledHeaders = $flag;
        return $this;
    }

    public function getStartIndex()
    {
        return $this->_startIndex;
    }

    public function setStartIndex($itemStartIndex)
    {
        $this->_startIndex = $itemStartIndex;
        return $this;
    }

    public function getItemName()
    {
        return $this->_itemName;
    }

    public function setItemName($itemName)
    {
        $this->_itemName = $itemName;
        return $this;
    }

    public function getItemsName()
    {
        return $this->_itemsName;
    }

    public function getMaxItems()
    {
        return $this->_maxItems;
    }

    public function setMaxItems($maxItems)
    {
        $this->_maxItems = $maxItems;
        return $this;
    }

    public function setItemsName($itemsName)
    {
        $this->_itemsName = $itemsName;
        return $this;
    }

    public function getItemClass()
    {
        return $this->_itemClass;
    }

    public function setItemClass($itemClass)
    {
        $this->_itemClass = $itemClass;
        return $this;
    }

    public function getItemOptions()
    {
        return $this->_itemOptions;
    }

    public function setItemOptions(array $itemOptions)
    {
        $this->_itemOptions = $itemOptions;
        return $this;
    }

    public function isRequired()
    {
        return $this->_required;
    }

    public function setRequired($required = true)
    {
        $this->_required = $required;
        return $this;
    }

    public function getDescription()
    {
        return $this->_description;
    }

    public function setDescription($description)
    {
        $this->_description = $description;
        return $this;
    }

    protected function _initElements()
    {
        $index = $this->getStartIndex();
        $i = 0;
        $count = count($this->getRows());
        foreach ($this->getRows() as $name => $defaults) {
            $first = $i === 0;
            $last = $i === $count - 1;
            $this->addSubForm($this->createRow(compact('name', 'index', 'defaults', 'first', 'last')), $name);
            $index++;
            $i++;
        }
        $this->addAddNewButton();
        return parent::_initElements();
    }

    public function createRow(array $options, $itemClass = null)
    {
        $options = array_merge(
            $this->getItemOptions(),
            [
                'orientation' => $this->getOrientation(),
                'sortable'    => $this->isSortable(),
                'numerable'   => $this->isNumerable(),
                'removable'   => $this->isRemovable(),
            ],
            $options
        );

        if (null === $itemClass) {
            $itemClass = $this->_itemClass;
        }
        return new $itemClass($options);
    }

    protected function getRows()
    {
        return $this->_defaults;
    }

    protected function addAddNewButton()
    {
        $decorators = [
            'ViewHelper',
            'Errors',
            [
                ['td' => 'HtmlTag'],
                [
                    'tag'     => 'td',
                    'class'   => 'bottom-row',
                    'colspan' => $this->getColumnsCount(),
                    'id'      => ['callback' => ['Zend_Form_Element', 'resolveElementId']],
                ],
            ],
            [['tr' => 'HtmlTag'], ['tag' => 'tr']],
        ];
        $this->addElement(
            'button',
            'btnAddNew',
            [
                'label'           => 'Add New ' . $this->getItemName(),
                'data-action-add' => '',
                'class'           => 'btn btn-default btn-small',
                'decorators'      => $decorators,
            ]
        );
        return $this;
    }

    protected function getColumnsCount()
    {
        if (null === $this->_columnsCount) {
            $this->_columnsCount = ($form = $this->getItemSubForm()) ? $form->count() : 1;
        }
        return $this->_columnsCount;
    }

    /**
     * @return Table\Row
     * @throws \Exception
     */
    public function getItemSubForm()
    {
        if (null === $this->_itemSubForm) {
            $this->_itemSubForm = current($this->getSubForms());
            if (!$this->_itemSubForm) {
                if (null === $this->_itemClass) {
                    throw new Exception('itemClass is not deifned');
                }
                $this->_itemSubForm = new $this->_itemClass();
                if (!$this->_itemSubForm instanceof Table\Row) {
                    throw new Exception('itemClass should be instance of ' . Table\Row::CLASS);
                }
            }
        }
        return $this->_itemSubForm;
    }

    public function loadDefaultDecorators()
    {
        if ($this->loadDefaultDecoratorsIsDisabled()) {
            return $this;
        }
        if (($decorators = $this->getDecorators())) {
            return $this;
        }
        $labelAttribs = [
            'class' => $this->isRequired() ? 'required' : 'optional',
        ];
        if ($this->getOrientation() == self::ORIENTATION_HORIZONTAL && $this->isEnabledHeaders()) {
            $this->addDecorator('TableHeader');
            $this->addDecorator(['theadTr' => 'HtmlTag'], ['tag' => 'tr']);
            $this->addDecorator(['thead' => 'HtmlTag'], ['tag' => 'thead']);
        }
        $this->addDecorator(['tbodyOpen' => 'HtmlTag'], ['tag' => 'tbody', 'openOnly' => true, 'placement' => 'append']);
        $this->addDecorator('FormElements');
        $this->addDecorator(['tbodyClose' => 'HtmlTag'], ['tag' => 'tbody', 'closeOnly' => true, 'placement' => 'append']);

        $self = $this;
        $tableAttribs = $this->getTableAttribs();
        $tableAttribs['tag'] = 'table';
        if (empty($tableAttribs['id'])) {
            $tableAttribs['id'] = ['callback' => function () use ($self) {return $self->getId();}];
        }
        $tableAttribs['class'] = trim(
            'table table-bordered table-striped table-form '
            . Qs_Array::get($tableAttribs, 'class', '')
        );

        if (empty($this->getRows())) {
            $tableAttribs['class'] .= ' table-empty';
        }
        $this->addDecorator(['table' => 'HtmlTag'], $tableAttribs);
        $this->addDecorator('Description');
        $this->addDecorator('FormErrorMessages');
        $this->addDecorator('DtDdWrapper', ['label' => $this->getLabel() ?: $this->getItemsName(), 'labelAttribs' => $labelAttribs]);
        return $this;
    }

    protected function _addResources()
    {
        parent::_addResources();
        $options = [
            'id'         => $this->getId(),
            'name'       => $this->getElementsBelongTo(),
            'itemName'   => $this->getItemName(),
            'maxItems'   => $this->getMaxItems(),
            'sortable'   => $this->isSortable(),
            'numerable'  => $this->isNumerable(),
            'startIndex' => $this->getStartIndex(),
            'removable'  => $this->isRemovable(),
            'nodes'      => [
                'items' => '>tbody>[data-collection-item]',
                'add'   => '>tbody>tr>td>[data-action-add]',
            ],
        ];

        if ($this->isSortable()) {
            $options['nodes']['moveUp'] = '>td>[data-action-up]';
            $options['nodes']['moveDown'] = '>td>[data-action-down]';
        }
        if ($this->isRemovable()) {
            $options['nodes']['delete'] = '>td>[data-action-delete]';
        }
        if ($this->isNumerable()) {
            $options['nodes']['rowNumber'] = '>[data-row-number]';
        }
        $this->getDoc()->addInitObject('qs.form.subform.Table', [$options]);

        // Add related scripts if table has no rows
        if (empty($this->_defaults)) {
            $this->_addRelatedResources($this->createRow([]));
        }

        return $this;
    }
    
    protected function _addRelatedResources($item)
    {
        if ($item instanceof ResourceInterface && ($scripts = $item->getScripts())) {
            $this->getDoc()->addScripts($scripts);
        }
        if ($item instanceof Row) {
            /** @var Zend_Form_Element $element */
            foreach ($item->getElements() as $element) {
                foreach ($element->getDecorators() as $decorator) {
                    if ($decorator instanceof ResourceInterface && ($scripts = $decorator->getScripts())) {
                        $this->getDoc()->addScripts($scripts);
                    }
                }
            }
            foreach ($item->getSubForms() as $subForm) {
                $this->_addRelatedResources($subForm);
            }
        }
        if ($item instanceof self) {
            $this->_addRelatedResources($item->getItemSubForm());
        }
        return $this;
    }

    public function getTableAttribs()
    {
        return $this->_tableAttribs;
    }

    public function setTableAttribs($tableAttribs)
    {
        $this->_tableAttribs = $tableAttribs;
        return $this;
    }
}