<?php
/**
 * PayPal Pay Later Messaging — standalone promotional banner.
 * Shows text like "Pay in 4 payments of $X" near prices on product / cart pages.
 *
 * Usage — set $ppMessage before including:
 *
 *   $ppMessage = [
 *     'school_name' => 'Springfield Elementary',  // required — used to resolve merchant ID
 *     'amount'      => '95.00',                    // required — string
 *     'currency'    => 'USD',                      // optional, default USD
 *     'placement'   => 'product',                  // product | cart | payment | home
 *     'page_type'   => 'product-detail',           // for SDK data-page-type attr
 *     'style'       => [                           // optional — PayPal Messages style object
 *       'layout' => 'text',
 *       'logo'   => ['type' => 'inline'],          // inline | primary | alternative | none
 *       'text'   => ['size' => 13, 'color' => 'black'],
 *     ],
 *   ];
 *   require_once '/path/to/ppp/paypal-paylater-message.php';
 *
 * Coordinates with paypal-checkout-widget.php via $GLOBALS['_pp_sdk_loaded'] so the
 * SDK is never loaded twice on the same page regardless of include order.
 */

if (!isset($ppMessage) || !is_array($ppMessage)) {
    throw new RuntimeException('$ppMessage array must be set before including paypal-paylater-message.php');
}

// -- Resolve merchant and check readiness -------------------------------------
$_ppm_config        = require __DIR__ . '/config.php';

// Kill-switch shared with the checkout widget: set 'paylater_messaging' => false
// in config.php to disable Pay Later promo messaging everywhere (the SDK's
// messaging component has thrown unhandled PAGE_TYPE exceptions in some envs).
// Defaults to FALSE — see paypal-checkout-widget.php. A config predating this
// key must not re-enable the SDK messaging crash.
if (!(bool)($_ppm_config['paylater_messaging'] ?? false)) return;

$_ppm_merchantId    = null;
$_ppm_merchantsFile = __DIR__ . '/data/school_merchants.json';

if (file_exists($_ppm_merchantsFile)) {
    $_ppm_merchants = json_decode(file_get_contents($_ppm_merchantsFile), true) ?: [];
    $_ppm_record    = $_ppm_merchants[$ppMessage['school_name']] ?? null;
    if ($_ppm_record) {
        if ($ppMessage['school_name'] === '') return;
        if ($ppMessage['school_name'] !== '' && ($GLOBALS['_pp_msg_skipped'][$ppMessage['school_name']] ?? false)) return;
        if ($_ppm_record['consent_revoked'] ?? false) return;
        if (isset($_ppm_record['paypal_ready']) && !$_ppm_record['paypal_ready']) return;
        $_ppm_merchantId = $_ppm_record['merchant_id'] ?? null;
    }
}
if (!$_ppm_merchantId) return;

// -- Unique container ID (counter prevents collisions when included multiple times) --
$GLOBALS['_pp_msg_count'] = ($GLOBALS['_pp_msg_count'] ?? 0) + 1;
$_ppm_containerId = 'pp-msg-' . $GLOBALS['_pp_msg_count'];

// -- Params --------------------------------------------------------------------
$_ppm_clientId  = $_ppm_config['client_id'];
$_ppm_amount    = $ppMessage['amount'];
$_ppm_currency  = strtoupper($ppMessage['currency'] ?? 'USD');
$_ppm_placement = $ppMessage['placement']  ?? 'product';
$_ppm_pageType  = $ppMessage['page_type']  ?? 'product-details';

// PayPal's SDK rejects unknown data-page-type values ("Invalid page type"),
// which aborts the whole SDK load. Map aliases and fall back to a safe value.
$_ppmValidPageTypes = [
    'home', 'category', 'product-listing', 'search-results', 'product-details',
    'cart', 'mini-cart', 'checkout', 'order-review', 'order-confirmation',
    'account', 'profile', 'blog', 'about', 'contact', 'landing', 'marketing',
    'help', 'search', 'unknown',
];
$_ppmPageTypeAliases = ['product-detail' => 'product-details', 'product' => 'product-details'];
$_ppm_pageType = $_ppmPageTypeAliases[$_ppm_pageType] ?? $_ppm_pageType;
if (!in_array($_ppm_pageType, $_ppmValidPageTypes, true)) {
    $_ppm_pageType = 'product-details';
}
$_ppm_style     = $ppMessage['style'] ?? [
    'layout' => 'text',
    'logo'   => ['type' => 'inline'],
    'text'   => ['size' => 13, 'color' => 'black'],
];

// -- SDK: load once per page ---------------------------------------------------
$_ppmSdkAlready = $GLOBALS['_pp_sdk_loaded'] ?? false;
if (!$_ppmSdkAlready) {
    $GLOBALS['_pp_sdk_loaded'] = true;
    // Include the full component set (buttons,messages + applepay,googlepay) so the
    // checkout widget can share this SDK if it loads after us. The PayPal SDK can only
    // be loaded once per page, so if we omit applepay/googlepay here, paypal.Applepay /
    // paypal.Googlepay would be undefined in the widget and the wallet buttons vanish.
    $_ppm_sdkUrl = 'https://www.paypal.com/sdk/js'
        . '?client-id='   . urlencode($_ppm_clientId)
        . '&merchant-id=' . urlencode($_ppm_merchantId)
        . '&currency='    . $_ppm_currency
        . '&components=buttons,applepay,googlepay';
}
?>

<?php /* NOTE: no data-page-type attribute — the SDK throws "Cannot set
         properties of undefined (setting 'PAGE_TYPE')" asynchronously when it
         is present (internal SDK bug). Optional analytics hint only. */ ?>
<?php if (!$_ppmSdkAlready): ?>
<script
  src="<?= htmlspecialchars($_ppm_sdkUrl) ?>"
  data-partner-attribution-id="EZSSOFTWAREINC_SP_PPCP"
></script>
<?php endif; ?>

<div id="<?= $_ppm_containerId ?>" class="pp-paylater-banner"></div>

<style>
#<?= $_ppm_containerId ?>.pp-paylater-banner { min-height: 18px; margin: 4px 0 8px; }
</style>

<script>
(function () {
  var id     = <?= json_encode('#' . $_ppm_containerId) ?>;
  // No placement/pageType — the SDK's placement?PAGE_TYPE mapping has crashed
  // with "Cannot set properties of undefined"; defaults are fine for text promos.
  var config = {
    amount: parseFloat(<?= json_encode($_ppm_amount) ?>),
    style:  <?= json_encode($_ppm_style, JSON_UNESCAPED_UNICODE) ?>,
  };

  function render() {
    if (window.paypal && window.paypal.Messages) {
      window.paypal.Messages(config).render(id);
    }
  }

  // If SDK is already present (loaded above or by widget earlier on the page) render now.
  // Otherwise DOMContentLoaded is the safe fallback — by then all blocking scripts have run.
  if (window.paypal && window.paypal.Messages) {
    render();
  } else {
    document.addEventListener('DOMContentLoaded', render);
  }
}());
</script>