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<?php

namespace LVR\CreditCard\Cards;

use LVR\CreditCard\Exceptions\CreditCardCharactersException;
use LVR\CreditCard\Exceptions\CreditCardChecksumException;
use LVR\CreditCard\Exceptions\CreditCardCvcException;
use LVR\CreditCard\Exceptions\CreditCardException;
use LVR\CreditCard\Exceptions\CreditCardLengthException;
use LVR\CreditCard\Exceptions\CreditCardNameException;
use LVR\CreditCard\Exceptions\CreditCardPatternException;
use LVR\CreditCard\Exceptions\CreditCardTypeException;

abstract class Card
{
    /**
     * Regular expression for card number recognition.
     *
     * @var string
     */
    public static $pattern;

    /**
     * Credit card type: "debit", "credit".
     *
     * @var string
     */
    protected $type;

    /**
     * Credit card name.
     *
     * @var string
     */
    protected $name;

    /**
     * Brand name.
     *
     * @var string
     */
    protected $brand;

    /**
     * Card number length's.
     *
     * @var array
     */
    protected $number_length;

    /**
     * CVC code length's.
     *
     * @var array
     */
    protected $cvc_length;

    /**
     * Test cvc code checksum against Luhn algorithm.
     *
     * @var bool
     */
    protected $checksum_test;

    /**
     * @var string|null
     */
    private $card_number;

    /**
     * Card constructor.
     *
     * @param  string  $card_number
     *
     * @throws \LVR\CreditCard\Exceptions\CreditCardException
     */
    public function __construct(string $card_number = '')
    {
        $this->checkImplementation();

        if ($card_number) {
            $this->setCardNumber($card_number);
        }
    }

    /**
     * @param  string  $card_number
     * @return $this
     *
     * @throws \LVR\CreditCard\Exceptions\CreditCardPatternException
     */
    public function setCardNumber(string $card_number)
    {
        $this->card_number = preg_replace('/\s+/', '', $card_number);

        $this->isValidCardNumber();

        if (! $this->validPattern()) {
            throw new CreditCardPatternException(
                sprintf('Wrong "%s" card pattern', $this->card_number)
            );
        }

        return $this;
    }

    /**
     * @return bool
     *
     * @throws \LVR\CreditCard\Exceptions\CreditCardChecksumException
     * @throws \LVR\CreditCard\Exceptions\CreditCardCharactersException
     * @throws \LVR\CreditCard\Exceptions\CreditCardException
     * @throws \LVR\CreditCard\Exceptions\CreditCardLengthException
     */
    public function isValidCardNumber()
    {
        if (! $this->card_number) {
            throw new CreditCardException('Card number is not set');
        }

        if (! is_numeric(preg_replace('/\s+/', '', $this->card_number))) {
            throw new CreditCardCharactersException(
                sprintf('Card number "%s" contains invalid characters', $this->card_number)
            );
        }

        if (! $this->validLength()) {
            throw new CreditCardLengthException(
                sprintf('Incorrect "%s" card length', $this->card_number)
            );
        }

        if (! $this->validChecksum()) {
            throw new CreditCardChecksumException(
                sprintf('Invalid card number: "%s". Checksum is wrong', $this->card_number)
            );
        }

        return true;
    }

    /**
     * @return string
     */
    public function type()
    {
        return $this->type;
    }

    /**
     * @return string
     */
    public function name()
    {
        return $this->name;
    }

    /**
     * @return string
     */
    public function brand()
    {
        return $this->brand;
    }

    /**
     * @param $cvc
     * @return bool
     */
    public function isValidCvc($cvc)
    {
        return is_numeric($cvc)
            && self::isValidCvcLength($cvc, $this->cvc_length);
    }

    /**
     * Check CVS length against possible lengths.
     *
     * @param  string|int  $cvc
     * @param  array  $available_lengths
     * @return bool
     */
    public static function isValidCvcLength($cvc, array $available_lengths = [3, 4])
    {
        return
            is_numeric($cvc)
            && in_array(strlen($cvc), $available_lengths, true);
    }

    /**
     * @throws \LVR\CreditCard\Exceptions\CreditCardException
     */
    protected function checkImplementation()
    {
        if (! $this->type || ! is_string($this->type) || ! in_array($this->type, ['debit', 'credit'])) {
            throw new CreditCardTypeException('Credit card type is missing');
        }

        if (! $this->name || ! is_string($this->name)) {
            throw new CreditCardNameException('Credit card name is missing or is not a string');
        }

        if (! static::$pattern || ! is_string(static::$pattern)) {
            throw new CreditCardPatternException(
                'Credit card number recognition pattern is missing or is not a string'
            );
        }

        if (empty($this->number_length) || ! is_array($this->number_length)) {
            throw new CreditCardLengthException(
                'Credit card number length is missing or is not an array'
            );
        }

        if (empty($this->cvc_length) || ! is_array($this->cvc_length)) {
            throw new CreditCardCvcException(
                'Credit card cvc code length is missing or is not an array'
            );
        }

        if ($this->checksum_test === null || ! is_bool($this->checksum_test)) {
            throw new CreditCardChecksumException(
                'Credit card checksum test is missing or is not a boolean'
            );
        }
    }

    /**
     * @return bool
     */
    protected function validPattern()
    {
        return (bool) preg_match(static::$pattern, $this->card_number);
    }

    /**
     * @return bool
     */
    protected function validLength()
    {
        return in_array(strlen($this->card_number), $this->number_length, true);
    }

    /**
     * @return bool
     */
    protected function validChecksum()
    {
        return ! $this->checksum_test || $this->checksumTest();
    }

    /**
     * @return bool
     */
    protected function checksumTest()
    {
        $checksum = 0;
        $len = strlen($this->card_number);
        for ($i = 2 - ($len % 2); $i <= $len; $i += 2) {
            $checksum += $this->card_number[$i - 1];
        }
        // Analyze odd digits in even length strings or even digits in odd length strings.
        for ($i = $len % 2 + 1; $i < $len; $i += 2) {
            $digit = $this->card_number[$i - 1] * 2;
            if ($digit < 10) {
                $checksum += $digit;
            } else {
                $checksum += $digit - 9;
            }
        }

        return ($checksum % 10) === 0;
    }
}