<?php

namespace cx_newsletter;

class customer_validator 
extends validator
implements validator_interface {
    protected function validate() : ?string {
        $customer = $this->get_target();
   
        if (!$customer->is_complete()) {
            return 'Target is not complete.';
        }

        if (strlen($customer->name) < 4) {
            return 'Name of the customer must have minimum 4 chars.';
        }

        if (strlen($customer->name) > 64) {
            return 'Name of the customer must have less than 64 chars.';
        }

        if (strlen($customer->surname) > 64) {
            return 'Surname of the customer must have less than 64 chars.';
        }

        if (strlen($customer->company) > 128) {
            return 'Company name must have less than 128 chars.';
        }

        if (strlen($customer->comments) > 255) {
            return 'Comments of the customer must be shorten than 255 chars.';
        }

        $has_email = !empty($customer->email);
        $has_phone = !empty($customer->phone_number);

        $phone_validator = new \cx_appengine\validator('phone');
        $email_validator = new \cx_appengine\validator('email');

        $good_email = $email_validator->validate($customer->email);

        $good_phone = true;

        if (strlen($customer->phone_number) > 12) {
            $good_phone = false;
        }

        if (strlen($customer->phone_number) < 9) {
            $good_phone = false;
        }

        if ($has_email and !$good_email) {
            return 'Email is not valid!';
        }

        if ($has_phone and !$good_phone) {
            return 'Phone number is not valid.';
        }

        if (!$has_email and !$has_phone) {
            return 'Customer must have phone number, email or both.';
        }

        $email_filter = [ 'email' => $customer->email ];
        $phone_filter = [ 'phone_number' => $customer->phone_number ];

        $emails = $this->get_mapper()->load_all($email_filter);
        $phones = $this->get_mapper()->load_all($phone_filter);
       
        $id = null;

        if ($customer->has_id()) {
            $id = $customer->get_id();
        }

        foreach ($emails as $collision) {  
            if (!$has_email) {
                break;
            }

            if ($id !== null and $collision->get_id() === $id) {
                continue;
            }
            
            return 'Customer with that E-Mail already exists.';
        }

        foreach ($phones as $collision) {
            if (!$has_phone) {
                break;
            }   

            if ($id !== null and $collision->get_id() === $id) {
                continue;
            }
            
            return 'Customer with that phone number already exists.';
        }

        return null;
    }

    public function prevalidate(\wpdb $database, table_names $tables) : void {
        $this->mapper = new customers_mapper($database, $tables);
    }

    protected function get_mapper() : customers_mapper {
        return $this->mapper;
    }

    private customers_mapper $mapper;
}