<?php

namespace Qs\ViewController;

use Qs_Array;
use Qs_ConfigTrait;
use Qs_Navigation;
use Qs_Options;
use Qs_String;

class Navigation
{
    const ADD     = 'add';
    const EDIT    = 'edit';
    const REORDER = 'reorder';
    const PREVIEW = 'preview';

    protected $entity = [];
    protected $page = [];
    protected $templates = [];
    protected $action;
    protected $itemName;
    protected $itemsName;
    protected $showItem = false;

    public function __construct(array $options = [])
    {
        Qs_Options::setOptions($this, $options);
    }

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

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

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

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

    public function isShowItem()
    {
        return $this->showItem;
    }

    public function showItem($flag = true)
    {
        $this->showItem = $flag;
        return $this;
    }

    public function getEntity($field = null, $default = null)
    {
        return Qs_Array::get($this->entity, $field, $default);
    }

    public function setEntity($entity)
    {
        $this->entity = $entity;
        return $this;
    }

    public function getAction()
    {
        return $this->action;
    }

    public function setAction($action)
    {
        $this->action = $action;
        return $this;
    }

    public function getTemplate($action, $default = null)
    {
        return isset($this->templates[$action]) ? $this->templates[$action] : $default;
    }

    public function setTemplate($action, $pattern)
    {
        $this->templates[$action] = $pattern;
        return $this;
    }

    public function setTemplates(array $templates)
    {
        $this->templates = $templates;
        return $this;
    }

    public function getPage($field = null, $default = null)
    {
        return Qs_Array::get($this->page, $field, $default);
    }

    public function setPage($page)
    {
        $this->page = $page;
        return $this;
    }

    public function addPage()
    {
        return $this->add($this->getPage('menuTitle'), $this->getPage('url'));
    }

    public function exec()
    {
        $this->enable();
        $this->addPage();

        if ($this->isShowItem() && $this->getEntity()) {
            $this->add($this->getEntity('title'), $this->getActionUrl('edit'));
        }

        $this->addAction();

        return $this;
    }

    public function enable()
    {
        Qs_Navigation::enable();
        return $this;
    }

    public function addAction()
    {
        $action = $this->getAction();
        switch ($action) {
            case 'new':
                // break was intentionally omitted
            case 'insert':
                $this->add($this->getTemplate(self::ADD, 'Add New {itemName}'));
                break;
            case 'edit':
                // break was intentionally omitted
            case 'update':
                $this->add($this->getTemplate(self::EDIT, 'Edit "{title}" {itemName}'), $this->getActionUrl('edit'));
                break;
            case 'reorder':
                // break was intentionally omitted
            case 'updateOrder':
                $this->add($this->getTemplate(self::REORDER, 'Reorder {itemsName}'));
                break;
            case 'view':
                $this->add($this->getTemplate(self::PREVIEW, 'Preview "{title}" {itemName}'), $this->getActionUrl('edit'));
                break;
        }
        return $this;
    }

    protected function getActionUrl($action)
    {
        return $this->getPage('url') . '?' . http_build_query(['action' => $action, 'id' => $this->getEntity('id')]);
    }

    protected function getPlaceholders()
    {
        $placeholders = [
            'itemName'  => $this->getItemName(),
            'itemsName' => $this->getItemsName(),
        ];
        $placeholders = array_merge($placeholders, $this->getEntity());
        $placeholders = array_filter($placeholders, 'is_scalar');
        return $placeholders;
    }

    public function add($title, $url = null)
    {
        $title = Qs_String::fill($title, $this->getPlaceholders(), '{}');
        Qs_Navigation::add(compact('title', 'url'));
        return $this;
    }

    public function unshift($title, $url = null)
    {
        $title = Qs_String::fill($title, $this->getPlaceholders(), '{}');
        Qs_Navigation::unshift(compact('title', 'url'));
        return $this;
    }
}