<?php

namespace App\Form;

use Qs_Array;
use Qs_Session_Namespace;
use Qs_ViewController;

/**
 * Class StepAwareViewTrait
 * @package App\Form
 * @mixin Qs_ViewController
 */
trait StepAwareViewTrait
{
    protected $step;
    protected $steps;
    protected $session;

    public function getStep($name, $field = null, $default = null)
    {
        foreach ($this->getSteps() as $step) {
            if ($step['name'] === $name) {
                return Qs_Array::get($step, $field, $default);
            }
        }
        return $default;
    }

    public function getCurrentStep($field = null, $default = null)
    {
        return $this->getStep($this->step, $field, $default);
    }

    protected function getSteps()
    {
        if (null === $this->steps) {
            $this->steps = $this->getConfigArray('steps', []);
            $completed = true;
            $last = count($this->steps) - 1;
            foreach ($this->steps as $index => &$step) {
                $step['number'] = $index + 1;
                $step['enabled'] = true;
                $step['current'] = $step['name'] == $this->step;
                if ($step['current']) {
                    $completed = false;
                }
                $step['completed'] = $completed;
                $step['url'] = self::getStepUrl($step['name']);
            }
        }
        return $this->steps;
    }

    protected function isPreviousStepCompleted()
    {
        if (false === ($previousStep = $this->getPreviousStepName())) {
            return true;
        }
        $data = $this->getStepData($previousStep);
        return !empty($data);
    }

    protected function redirectToStep($step)
    {
        $this->redirect(self::getStepUrl($step));
        return $this;
    }

    private function getSession()
    {
        if (null === $this->session) {
            $this->session = new Qs_Session_Namespace(__CLASS__);
        }
        return $this->session;
    }

    protected function getStepData($step = null, $field = null, $default = null)
    {
        if (null === $step) {
            $step = $this->step;
        }
        $session = $this->getSession();
        $data = [];
        if (isset($session->$step)) {
            $data = $session->$step;
            if (array_key_exists('__idItem', $data)) {
                unset($data['__idItem']);
            }
        }
        return Qs_Array::get($data, $field, $default);
    }

    protected function setStepData($step = null, $field, $value)
    {
        if (null === $step) {
            $step = $this->step;
        }
        $data = $this->getStepData($step);
        Qs_Array::set($data, $field, $value);
        $this->saveStepData($step, $data);
        return $this;
    }

    public function saveStepData($step, array $data)
    {
        $session = $this->getSession();
        unset($data['__idItem']);
        $session->{$step} = $data;
        return $this;
    }

    protected function clearStepData($step)
    {
        $steps = (array) $step;
        $session = $this->getSession();
        foreach ($steps as $step) {
            unset($session->{$step});
        }
        return $this;
    }

    public function clearSession()
    {
        $session = $this->getSession();
        $session->unsetAll();
        return $this;
    }

    protected function getSessionData()
    {
        $session = $this->getSession();
        return (array) $session->getIterator();
    }

    protected function getPreviousStepName($step = null)
    {
        if ($step === null) {
            $step = $this->step;
        }
        $steps = array_column($this->getSteps(), 'name');
        if (false !== ($index = array_search($step, $steps)) && array_key_exists($index - 1, $steps)) {
            return $steps[$index - 1];
        }
        return false;
    }

    protected function getNextStepName()
    {
        $steps = array_column($this->getSteps(), 'name');
        if (false !== ($index = array_search($this->step, $steps)) && array_key_exists($index + 1, $steps)) {
            return $steps[$index + 1];
        }
        return false;
    }

    protected function renderProgressBar()
    {
        $item = [
            'currentStep' => $this->getCurrentStep(),
            'steps'       => $this->getSteps(),
            'tpl'         => $this->getTemplate('steps.tpl'),
        ];
        return $this->_doc->fetchItem($item);
    }
}