<?php

namespace App\User;

use Qs_Array;

class Diff
{
    const TYPE_STRING = 0;
    const TYPE_ARRAY  = 1;

    protected $_fields = [
        'firstName'   => ['title' => 'First Name', 'type' => self::TYPE_STRING],
        'lastName'    => ['title' => 'Last Name', 'type' => self::TYPE_STRING],
        'email'       => ['title' => 'Email', 'type' => self::TYPE_STRING],
        'directPhone' => ['title' => 'Direct Phone', 'type' => self::TYPE_STRING],
        'cellPhone'   => ['title' => 'Cell Phone', 'type' => self::TYPE_STRING],
        'photo'       => ['title' => 'Photo', 'type' => self::TYPE_STRING],
        'bio'         => ['title' => 'Bio', 'type' => self::TYPE_STRING],
        'linkedInUrl' => ['title' => 'LinkedIn Url', 'type' => self::TYPE_STRING],
        'home'        => [
            'type'   => self::TYPE_ARRAY,
            'fields' => [
                'address'  => ['title' => 'Home Address', 'type' => self::TYPE_STRING],
                'address2' => ['title' => 'Home Address 2', 'type' => self::TYPE_STRING],
                'city'     => ['title' => 'Home City', 'type' => self::TYPE_STRING],
                'state'    => ['title' => 'Home State', 'type' => self::TYPE_STRING],
                'zip'      => ['title' => 'Home Zip', 'type' => self::TYPE_STRING],
            ],
        ],
        'billing'     => [
            'type'   => self::TYPE_ARRAY,
            'fields' => [
                'firstName' => ['title' => 'Billing Fist Name', 'type' => self::TYPE_STRING],
                'lastName'  => ['title' => 'Billing Last Name', 'type' => self::TYPE_STRING],
                'address'   => ['title' => 'Billing Address', 'type' => self::TYPE_STRING],
                'address2'  => ['title' => 'Billing Address 2', 'type' => self::TYPE_STRING],
                'city'      => ['title' => 'Billing City', 'type' => self::TYPE_STRING],
                'state'     => ['title' => 'Billing State', 'type' => self::TYPE_STRING],
                'zip'       => ['title' => 'Billing Zip', 'type' => self::TYPE_STRING],
            ],
        ],
        'shipping'    => [
            'type'   => self::TYPE_ARRAY,
            'fields' => [
                'firstName' => ['title' => 'Shipping Fist Name', 'type' => self::TYPE_STRING],
                'lastName'  => ['title' => 'Shipping Last Name', 'type' => self::TYPE_STRING],
                'address'   => ['title' => 'Shipping Address', 'type' => self::TYPE_STRING],
                'address2'  => ['title' => 'Shipping Address 2', 'type' => self::TYPE_STRING],
                'city'      => ['title' => 'Shipping City', 'type' => self::TYPE_STRING],
                'state'     => ['title' => 'Shipping State', 'type' => self::TYPE_STRING],
                'zip'       => ['title' => 'Shipping Zip', 'type' => self::TYPE_STRING],
            ],
        ],
    ];
    protected $_data1 = [];
    protected $_data2 = [];

    protected $_bioChangedMessage = 'HTML Content Changed';

    public function __construct(array $data1, array $data2)
    {
        $this->_data1 = $data1;
        $this->_data2 = $data2;
    }

    public function getDiff()
    {
        $updatedValues = [];

        if ($this->_data1 && $this->_data2) {
            $data1 = $this->_getData4Compare($this->_data1, $this->_fields);
            $data2 = $this->_getData4Compare($this->_data2, $this->_fields);

            $data1Diff = Qs_Array::diffRecursive($data1, $data2);
            $data2Diff = Qs_Array::diffRecursive($data2, $data1);

            $updatedValues = $this->_getUpdatedValues($data1Diff, $data2Diff, $this->_fields);

            if (array_key_exists('bio', $updatedValues)) {
                $updatedValues['bio']['previousValue'] = $this->_bioChangedMessage;
                $updatedValues['bio']['currentValue'] = $this->_bioChangedMessage;
            }
        }

        return $updatedValues;
    }

    protected function _getUpdatedValues(array $prevValues, array $currValues, array $fields, $keyPrefix = null)
    {
        $values = [];

        foreach ($fields as $field => $info) {
            if (self::TYPE_ARRAY == $info['type']) {
                $subValues = $this->_getUpdatedValues(
                    Qs_Array::get($prevValues, $field, []),
                    Qs_Array::get($currValues, $field, []),
                    $info['fields'],
                    $field
                );
                if ($subValues) {
                    $values += $subValues;
                }
            } else {
                if (array_key_exists($field, $prevValues)) {
                    $key = (null === $keyPrefix) ? $field : ($keyPrefix . ucfirst($field));
                    $values[$key] = [
                        'title'         => $info['title'],
                        'previousValue' => $prevValues[$field],
                        'currentValue'  => $currValues[$field],
                    ];
                }
            }
        }

        return $values;
    }

    protected function _getData4Compare(array $data, array $fields)
    {
        $prepared = [];

        if ('y' == Qs_Array::get($data, 'shipping[asBilling]')) {
            $data[Entity::ADDRESS_SHIPPING] = Qs_Array::get($data, Entity::ADDRESS_BILLING, []);
        }

        foreach ($fields as $field => $info) {
            if (self::TYPE_ARRAY == $info['type']) {
                $prepared[$field] = $this->_getData4Compare(Qs_Array::get($data, $field, []), $info['fields']);
            } else {
                $prepared[$field] = Qs_Array::get($data, $field, '');
            }
        }

        return $prepared;
    }
}