<?php
/**
 * Blockonomics Gateway
 *
 * The Blockonomics API documentation can be found at:
 * https://www.blockonomics.co/views/api.html
 *
 * @package blesta
 * @subpackage blesta.components.gateways.blockonomics
 * @copyright Copyright (c) 2024, Phillips Data, Inc.
 * @license http://www.blesta.com/license/ The Blesta License Agreement
 * @link http://www.blesta.com/ Blesta
 */
class Blockonomics extends NonmerchantGateway
{
    /**
     * @var array An array of meta data for this gateway
     */
    private $meta;

    /**
     * Construct a new merchant gateway
     */
    public function __construct()
    {
        // Load the Blockonomics API
        Loader::load(dirname(__FILE__) . DS . 'lib' . DS . 'blockonomics_api.php');

        // Load configuration required by this gateway
        $this->loadConfig(dirname(__FILE__) . DS . 'config.json');

        // Load components required by this gateway
        Loader::loadComponents($this, ['Input']);

        // Load the language required by this gateway
        Language::loadLang('blockonomics', null, dirname(__FILE__) . DS . 'language' . DS);
    }

    /**
     * Sets the meta data for this particular gateway
     *
     * @param array $meta An array of meta data to set for this gateway
     */
    public function setMeta(array $meta = null)
    {
        $this->meta = $meta;
    }

    /**
     * Create and return the view content required to modify the settings of this gateway
     *
     * @param array $meta An array of meta (settings) data belonging to this gateway
     * @return string HTML content containing the fields to update the meta data for this gateway
     */
    public function getSettings(array $meta = null)
    {
        // Load the view into this object, so helpers can be automatically add to the view
        $this->view = new View('settings', 'default');
        $this->view->setDefaultView('components' . DS . 'gateways' . DS . 'nonmerchant' . DS . 'blockonomics' . DS);
        // Load the helpers required for this view
        Loader::loadHelpers($this, ['Form', 'Html']);

        $this->view->set('meta', $meta);

        return $this->view->fetch();
    }

    /**
     * Validates the given meta (settings) data to be updated for this gateway
     *
     * @param array $meta An array of meta (settings) data to be updated for this gateway
     * @return array The meta data to be updated in the database for this gateway, or reset into the form on failure
     */
    public function editSettings(array $meta)
    {
        $rules = [
            'api_key' => [
                'valid' => [
                    'rule' => function ($api_key) {
                        try {
                            $api = $this->getApi($api_key);
                            $limits = $api->price('USD');

                            return !empty($limits);
                        } catch (Throwable $e) {
                            return false;
                        }
                    },
                    'message' => Language::_('Blockonomics.!error.api_key.valid', true)
                ]
            ]
        ];
        $this->Input->setRules($rules);

        // Set unset checkboxes
        $checkbox_fields = [];

        foreach ($checkbox_fields as $checkbox_field) {
            if (!isset($meta[$checkbox_field])) {
                $meta[$checkbox_field] = 'false';
            }
        }

        // Validate the given meta data to ensure it meets the requirements
        $this->Input->validates($meta);

        // Return the meta data, no changes required regardless of success or failure for this gateway
        return $meta;
    }

    /**
     * Returns an array of all fields to encrypt when storing in the database
     *
     * @return array An array of the field names to encrypt when storing in the database
     */
    public function encryptableFields()
    {
        return ['api_key'];
    }

    /**
     * Sets the currency code to be used for all subsequent payments
     *
     * @param string $currency The ISO 4217 currency code to be used for subsequent payments
     */
    public function setCurrency($currency)
    {
        $this->currency = $currency;
    }

    /**
     * Returns all HTML markup required to render an authorization and capture payment form
     *
     * @param array $contact_info An array of contact info including:
     *  - id The contact ID
     *  - client_id The ID of the client this contact belongs to
     *  - user_id The user ID this contact belongs to (if any)
     *  - contact_type The type of contact
     *  - contact_type_id The ID of the contact type
     *  - first_name The first name on the contact
     *  - last_name The last name on the contact
     *  - title The title of the contact
     *  - company The company name of the contact
     *  - address1 The address 1 line of the contact
     *  - address2 The address 2 line of the contact
     *  - city The city of the contact
     *  - state An array of state info including:
     *      - code The 2 or 3-character state code
     *      - name The local name of the country
     *  - country An array of country info including:
     *      - alpha2 The 2-character country code
     *      - alpha3 The 3-cahracter country code
     *      - name The english name of the country
     *      - alt_name The local name of the country
     *  - zip The zip/postal code of the contact
     * @param float $amount The amount to charge this contact
     * @param array $invoice_amounts An array of invoices, each containing:
     *  - id The ID of the invoice being processed
     *  - amount The amount being processed for this invoice (which is included in $amount)
     * @param array $options An array of options including:
     *  - description The Description of the charge
     *  - return_url The URL to redirect users to after a successful payment
     *  - recur An array of recurring info including:
     *      - amount The amount to recur
     *      - term The term to recur
     *      - period The recurring period (day, week, month, year, onetime) used in conjunction
     *          with term in order to determine the next recurring payment
     * @return string HTML markup required to render an authorization and capture payment form
     */
    public function buildProcess(array $contact_info, $amount, array $invoice_amounts = null, array $options = null)
    {
        // Force 2-decimal places only
        $amount = round($amount, 2);
        if (isset($options['recur']['amount'])) {
            $options['recur']['amount'] = round($options['recur']['amount'], 2);
        }

        $non_fractional_currencies = ["BIF", "CLP", "DJF", "GNF", "JPY", "KMF", "KRW", "PYG", "RWF", "UGX", "VND", "VUV", "XAF", "XOF", "XPF"];
        if (in_array($this->currency, $non_fractional_currencies)) {
            $amount = round($amount, 0);
            if (isset($options['recur']['amount'])) {
                $options['recur']['amount'] = round($options['recur']['amount'], 0);
            }
        }

        $this->view = $this->makeView('process', 'default', str_replace(ROOTWEBDIR, '', dirname(__FILE__) . DS));

        // Load the models and helpers required for this view
        Loader::loadModels($this, ['Companies']);
        Loader::loadHelpers($this, ['Form', 'Html']);

        // Get company information
        $company = $this->Companies->get(Configure::get('Blesta.company_id'));

        // Initialize API
        $api = $this->getApi($this->meta['api_key']);

        // Create order
        $params = [
            'product_name' => $company->name,
            'product_description' => $options['description'],
            'value' => $amount,
            'extra_data' => $contact_info['client_id'] . '#' . $amount . '#' . $this->currency . '#' . $this->serializeInvoices($invoice_amounts)
        ];
        $this->log('buildProcess', json_encode($params), 'input', true);

        $order = $api->createTemporaryProduct(($this->meta['parent_uid_' . $this->currency] ?? null), $params);
        $response = $order->response();
        $this->log('buildProcess', json_encode($response), 'output', empty($order->errors()));

        $this->view->set('uid', $response->uid);

        return $this->view->fetch();
    }

    /**
     * Validates the incoming POST/GET response from the gateway to ensure it is
     * legitimate and can be trusted.
     *
     * @param array $get The GET data for this request
     * @param array $post The POST data for this request
     * @return array An array of transaction data, sets any errors using Input if the data fails to validate
     *  - client_id The ID of the client that attempted the payment
     *  - amount The amount of the payment
     *  - currency The currency of the payment
     *  - invoices An array of invoices and the amount the payment should be applied to (if any) including:
     *      - id The ID of the invoice to apply to
     *      - amount The amount to apply to the invoice
     *  - status The status of the transaction (approved, declined, void, pending, reconciled, refunded, returned)
     *  - reference_id The reference ID for gateway-only use with this transaction (optional)
     *  - transaction_id The ID returned by the gateway to identify this transaction
     *  - parent_transaction_id The ID returned by the gateway to identify this
     *      transaction's original transaction (in the case of refunds)
     */
    public function validate(array $get, array $post)
    {
        // Fetch order ID
        $order_id = $get['order_id'] ?? null;

        // Log the response
        $this->log('validate|getOrder', json_encode($get), 'input', !empty($order_id));

        // Fetch order
        $api = $this->getApi($this->meta['api_key']);
        $order = $api->getOrder($order_id);
        $response = $order->response();

        $this->log('validate|getOrder', json_encode($response), 'output', !empty($response));

        // Discard callback call if status is not confirmed
        if ($response->status !== 2) {
            return;
        }

        // Deserialize extra information
        $extra_data = explode('#', $response->data->extradata ?? '', 4);
        $client_id = trim($extra_data[0] ?? '');
        $amount = trim($extra_data[1] ?? '');
        $currency = trim($extra_data[2] ?? '');

        $invoices = trim($extra_data[3] ?? '');
        $invoices = $this->unserializeInvoices($invoices);


        return [
            'client_id' => $client_id,
            'amount' => $amount,
            'currency' => $currency,
            'invoices' => $invoices,
            'status' => 'approved',
            'reference_id' => $response->address ?? '',
            'transaction_id' => $response->txid ?? '',
            'parent_transaction_id' => null
        ];
    }

    /**
     * Returns data regarding a success transaction. This method is invoked when
     * a client returns from the non-merchant gateway's web site back to Blesta.
     *
     * @param array $get The GET data for this request
     * @param array $post The POST data for this request
     * @return array An array of transaction data, may set errors using Input if the data appears invalid
     *  - client_id The ID of the client that attempted the payment
     *  - amount The amount of the payment
     *  - currency The currency of the payment
     *  - invoices An array of invoices and the amount the payment should be applied to (if any) including:
     *      - id The ID of the invoice to apply to
     *      - amount The amount to apply to the invoice
     *  - status The status of the transaction (approved, declined, void, pending, reconciled, refunded, returned)
     *  - transaction_id The ID returned by the gateway to identify this transaction
     *  - parent_transaction_id The ID returned by the gateway to identify this transaction's original transaction
     */
    public function success(array $get, array $post)
    {
        $params = [
            'status' => 'approved'
        ];

        return $params;
    }

    /**
     * Refund a payment
     *
     * @param string $reference_id The reference ID for the previously submitted transaction
     * @param string $transaction_id The transaction ID for the previously submitted transaction
     * @param float $amount The amount to refund this transaction
     * @param string $notes Notes about the refund that may be sent to the client by the gateway
     * @return array An array of transaction data including:
     *  - status The status of the transaction (approved, declined, void, pending, reconciled, refunded, returned)
     *  - reference_id The reference ID for gateway-only use with this transaction (optional)
     *  - transaction_id The ID returned by the remote gateway to identify this transaction
     *  - message The message to be displayed in the interface in addition to the standard
     *      message for this transaction status (optional)
     */
    public function refund($reference_id, $transaction_id, $amount, $notes = null)
    {
        $this->Input->setErrors($this->getCommonError('unsupported'));
    }

    /**
     * Void a payment or authorization.
     *
     * @param string $reference_id The reference ID for the previously submitted transaction
     * @param string $transaction_id The transaction ID for the previously submitted transaction
     * @param string $notes Notes about the void that may be sent to the client by the gateway
     * @return array An array of transaction data including:
     *  - status The status of the transaction (approved, declined, void, pending, reconciled, refunded, returned)
     *  - reference_id The reference ID for gateway-only use with this transaction (optional)
     *  - transaction_id The ID returned by the remote gateway to identify this transaction
     *  - message The message to be displayed in the interface in addition to the standard
     *      message for this transaction status (optional)
     */
    public function void($reference_id, $transaction_id, $notes = null)
    {
        $this->Input->setErrors($this->getCommonError('unsupported'));
    }

    /**
     * Serializes an array of invoice info into a string
     *
     * @param array A numerically indexed array invoices info including:
     *  - id The ID of the invoice
     *  - amount The amount relating to the invoice
     * @return string A serialized string of invoice info in the format of key1=value1|key2=value2
     */
    private function serializeInvoices(array $invoices)
    {
        $str = '';
        foreach ($invoices as $i => $invoice) {
            $str .= ($i > 0 ? '|' : '') . $invoice['id'] . '=' . $invoice['amount'];
        }
        return $str;
    }

    /**
     * Unserializes a string of invoice info into an array
     *
     * @param string A serialized string of invoice info in the format of key1=value1|key2=value2
     * @return array A numerically indexed array invoices info including:
     *  - id The ID of the invoice
     *  - amount The amount relating to the invoice
     */
    private function unserializeInvoices($str)
    {
        $invoices = [];
        $temp = explode('|', $str);
        foreach ($temp as $pair) {
            $pairs = explode('=', $pair, 2);
            if (count($pairs) != 2) {
                continue;
            }
            $invoices[] = ['id' => $pairs[0], 'amount' => $pairs[1]];
        }
        return $invoices;
    }

    /**
     * Loads the given API if not already loaded
     *
     * @param string $api_key The API key to authenticate
     * @return BlockonomicsApi An instance of the Blockonomics API
     */
    private function getApi($api_key)
    {
        Loader::load(dirname(__FILE__) . DS . 'lib' . DS . 'blockonomics_api.php');

        return new BlockonomicsApi($api_key);
    }
}
