<?php

namespace Altum\Controllers;

use Altum\Models\User;

class WebhookStripe extends Controller {

    public function index() {

        /* Initiate Stripe */
        \Stripe\Stripe::setApiKey(settings()->stripe->secret_key);

        $payload = @file_get_contents('php://input');
        $sig_header = $_SERVER['HTTP_STRIPE_SIGNATURE'];
        $event = null;

        try {
            $event = \Stripe\Webhook::constructEvent(
                $payload, $sig_header, settings()->stripe->webhook_secret
            );
        } catch(\UnexpectedValueException $e) {
            /* Invalid payload */
            echo $e->getMessage();
            http_response_code(400);
            die();
        } catch(\Stripe\Exception\SignatureVerificationException $e) {
            /* Invalid signature */
            echo $e->getMessage();
            http_response_code(400);
            die();
        }

        if(!in_array($event->type, ['invoice.paid', 'checkout.session.completed'])) {
            die();
        }

        $session = $event->data->object;

        $payment_id = $session->id;
        $payer_id = $session->customer;
        $payer_object = \Stripe\Customer::retrieve($payer_id);
        $payer_email = $payer_object->email;
        $payer_name = $payer_object->name;

        switch($event->type) {
            /* Handling recurring payments */
            case 'invoice.paid':

                $payment_total = in_array(settings()->payment->currency, ['MGA', 'BIF', 'CLP', 'PYG', 'DJF', 'RWF', 'GNF', 'UGX', 'JPY', 'VND', 'VUV', 'XAF', 'KMF', 'KRW', 'XOF', 'XPF']) ? $session->amount_paid : $session->amount_paid / 100;
                $payment_currency = mb_strtoupper($session->currency);

                /* Process meta data */
                $metadata = $session->lines->data[0]->metadata;

                $user_id = (int) $metadata->user_id;
                $plan_id = (int) $metadata->plan_id;
                $payment_frequency = $metadata->payment_frequency;
                $code = isset($metadata->code) ? $metadata->code : '';
                $discount_amount = isset($metadata->discount_amount) ? $metadata->discount_amount : 0;
                $base_amount = isset($metadata->base_amount) ? $metadata->base_amount : 0;
                $taxes_ids = isset($metadata->taxes_ids) ? $metadata->taxes_ids : null;

                /* Vars */
                $payment_type = $session->subscription ? 'recurring' : 'one_time';
                $payment_subscription_id =  $payment_type == 'recurring' ? 'stripe###' . $session->subscription : '';

                break;

            /* Handling one time payments */
            case 'checkout.session.completed':

                /* Exit when the webhook comes for recurring payments as the invoice.paid event will handle it */
                if($session->subscription) {
                    die();
                }

                $payment_total = in_array(settings()->payment->currency, ['MGA', 'BIF', 'CLP', 'PYG', 'DJF', 'RWF', 'GNF', 'UGX', 'JPY', 'VND', 'VUV', 'XAF', 'KMF', 'KRW', 'XOF', 'XPF']) ? $session->amount_total : $session->amount_total / 100;
                $payment_currency = mb_strtoupper($session->currency);

                /* Process meta data */
                $metadata = $session->metadata;

                $user_id = (int) $metadata->user_id;
                $plan_id = (int) $metadata->plan_id;
                $payment_frequency = $metadata->payment_frequency;
                $code = isset($metadata->code) ? $metadata->code : '';
                $discount_amount = isset($metadata->discount_amount) ? $metadata->discount_amount : 0;
                $base_amount = isset($metadata->base_amount) ? $metadata->base_amount : 0;
                $taxes_ids = isset($metadata->taxes_ids) ? $metadata->taxes_ids : null;

                /* Vars */
                $payment_type = $session->subscription ? 'recurring' : 'one_time';
                $payment_subscription_id =  $payment_type == 'recurring' ? 'stripe###' . $session->subscription : '';

                break;
        }

        /* Get the plan details */
        $plan = db()->where('plan_id', $plan_id)->getOne('plans');

        /* Just make sure the plan is still existing */
        if(!$plan) {
            http_response_code(400);
            die();
        }

        /* Make sure the transaction is not already existing */
        if(db()->where('payment_id', $payment_id)->where('processor', 'stripe')->has('payments')) {
            http_response_code(400);
            die();
        }

        /* Make sure the account still exists */
        $user = db()->where('user_id', $user_id)->getOne('users', ['user_id', 'email', 'payment_subscription_id', 'billing']);

        if(!$user) {
            http_response_code(400);
            die();
        }

        /* Unsubscribe from the previous plan if needed */
        if(!empty($user->payment_subscription_id) && $user->payment_subscription_id != $payment_subscription_id) {
            try {
                (new User())->cancel_subscription($user_id);
            } catch (\Exception $exception) {

                /* Output errors properly */
                if (DEBUG) {
                    echo $exception->getCode() . '-' . $exception->getMessage();

                    die();
                }
            }
        }

        /* Make sure the code exists */
        $codes_code = db()->where('code', $code)->where('type', 'discount')->getOne('codes');

        if($codes_code) {
            $code = $codes_code->code;

            /* Check if we should insert the usage of the code or not */
            if(!db()->where('user_id', $this->user->user_id)->where('code_id', $codes_code->code_id)->has('redeemed_codes')) {

                /* Update the code usage */
                db()->where('code_id', $codes_code->code_id)->update('codes', ['redeemed' => db()->inc()]);

                /* Add log for the redeemed code */
                db()->insert('redeemed_codes', [
                    'code_id'   => $codes_code->code_id,
                    'user_id'   => $user_id,
                    'date'      => \Altum\Date::$date
                ]);
            }
        }

        /* Add a log into the database */
        $payment_id = db()->insert('payments', [
            'user_id' => $user_id,
            'plan_id' => $plan_id,
            'processor' => 'stripe',
            'type' => $payment_type,
            'frequency' => $payment_frequency,
            'code' => $code,
            'discount_amount' => $discount_amount,
            'base_amount' => $base_amount,
            'email' => $payer_email,
            'payment_id' => $payment_id,
            'subscription_id' => $session->subscription,
            'payer_id' => $payer_id,
            'name' => $payer_name,
            'billing' => settings()->payment->taxes_and_billing_is_enabled && $user->billing ? $user->billing : null,
            'taxes_ids' => $taxes_ids,
            'total_amount' => $payment_total,
            'currency' => $payment_currency,
            'date' => \Altum\Date::$date
        ]);

        /* Update the user with the new plan */
        switch($payment_frequency) {
            case 'monthly':
                $plan_expiration_date = (new \DateTime())->modify('+30 days')->format('Y-m-d H:i:s');
                break;

            case 'annual':
                $plan_expiration_date = (new \DateTime())->modify('+12 months')->format('Y-m-d H:i:s');
                break;

            case 'lifetime':
                $plan_expiration_date = (new \DateTime())->modify('+100 years')->format('Y-m-d H:i:s');
                break;
        }

        /* Database query */
        db()->where('user_id', $user_id)->update('users', [
            'plan_id' => $plan_id,
            'plan_settings' => $plan->settings,
            'plan_expiration_date' => $plan_expiration_date,
            'payment_subscription_id' => $payment_subscription_id
        ]);

        /* Clear the cache */
        \Altum\Cache::$adapter->deleteItemsByTag('user_id=' . $user_id);

        /* Send notification to the user */
        /* Prepare the email */
        $email_template = get_email_template(
            [],
            language()->global->emails->user_payment->subject,
            [
                '{{PLAN_EXPIRATION_DATE}}' => \Altum\Date::get($plan_expiration_date, 2),
                '{{USER_PLAN_LINK}}' => url('account-plan'),
                '{{USER_PAYMENTS_LINK}}' => url('account-payments'),
            ],
            language()->global->emails->user_payment->body
        );

        send_mail(
            $user->email,
            $email_template->subject,
            $email_template->body
        );

        /* Send notification to admin if needed */
        if(settings()->email_notifications->new_payment && !empty(settings()->email_notifications->emails)) {

            send_mail(
                explode(',', settings()->email_notifications->emails),
                sprintf(language()->global->emails->admin_new_payment_notification->subject, 'stripe', $payment_total, $payment_currency),
                sprintf(language()->global->emails->admin_new_payment_notification->body, $payment_total, $payment_currency)
            );

        }

        echo 'successful';

    }

}
