<?php
declare(strict_types=1);

require_once dirname(__DIR__) . '/bootstrap.php';

$assets = app()->assets();
if ($assets) {
    $assets->addStyle('/module/fx-rates/asset?file=fx-rates.css');
    $assets->addScript('/module/fx-rates/asset?file=fx-rates-currencies.js', 'footer', true);
}

$settings = module_fn('fx-rates', 'settings');
$service = module_fn('fx-rates', 'service');
$notice = trim((string) ($_GET['notice'] ?? ''));
$error = trim((string) ($_GET['error'] ?? ''));

if (strtoupper((string) ($_SERVER['REQUEST_METHOD'] ?? 'GET')) === 'POST') {
    try {
        $action = trim((string) ($_POST['fx_action'] ?? ''));
        if ($action === 'save_selection') {
            $payload = [
                'display_base_currency' => (string) ($_POST['display_base_currency'] ?? ''),
                'preferred_currencies' => $_POST['preferred_currencies'] ?? [],
            ];
            $saved = module_fn('fx-rates', 'save_runtime_settings', $payload);
            $params = ['notice' => 'Waehrungs-Auswahl gespeichert.'];
            if (is_array($saved) && !empty($saved['display_base_currency'])) {
                $params['base'] = (string) $saved['display_base_currency'];
            }
            redirect('/module/fx-rates/currencies?' . http_build_query($params));
        }

        if ($action === 'sync_catalog') {
            $result = module_fn('fx-rates', 'run_setup_action', 'sync_currency_catalog');
            redirect('/module/fx-rates/currencies?' . http_build_query([
                'notice' => sprintf('Waehrungskatalog synchronisiert. %d Waehrungen verarbeitet.', (int) ($result['synced_count'] ?? 0)),
            ]));
        }

        if ($action === 'refresh_rates') {
            $result = $service->refreshLatestRates(null, (string) ($settings['default_base_currency'] ?? ''), 'manual');
            redirect('/module/fx-rates/currencies?' . http_build_query([
                'notice' => sprintf('Alle Wechselkurse aktualisiert. %d Werte gespeichert.', (int) ($result['updated_count'] ?? 0)),
            ]));
        }
    } catch (\Throwable $exception) {
        redirect('/module/fx-rates/currencies?' . http_build_query([
            'error' => $exception->getMessage() !== '' ? $exception->getMessage() : 'Aktion konnte nicht ausgefuehrt werden.',
        ]));
    }
}

$catalog = is_array($settings['currency_catalog'] ?? null) ? $settings['currency_catalog'] : [];
$preferredCurrencies = is_array($settings['preferred_currencies'] ?? null) ? $settings['preferred_currencies'] : [];
$savedDisplayBaseCurrency = strtoupper(trim((string) ($settings['display_base_currency'] ?? $settings['default_base_currency'] ?? 'EUR')));
$requestedDisplayBaseCurrency = strtoupper(trim((string) ($_GET['base'] ?? '')));
$latest = $service->latestStatus();
$recentFetches = $service->recentFetches(15);

$currencies = [];
foreach ($catalog as $item) {
    if (!is_array($item)) {
        continue;
    }
    $code = strtoupper(trim((string) ($item['code'] ?? '')));
    $name = trim((string) ($item['name'] ?? ''));
    if ($code === '' || $name === '') {
        continue;
    }
    $currencies[] = [
        'code' => $code,
        'name' => $name,
    ];
}

$cryptoCodes = array_fill_keys([
    'ADA', 'ARB', 'BNB', 'BTC', 'DAI', 'DOGE', 'DOT', 'ETH', 'LINK', 'LTC',
    'SOL', 'USDC', 'USDT', 'XAG', 'XAU', 'XRP',
], true);
$fiatCount = 0;
$cryptoCount = 0;
foreach ($currencies as $currency) {
    if (isset($cryptoCodes[$currency['code']])) {
        $cryptoCount++;
    } else {
        $fiatCount++;
    }
}

$catalogCodes = [];
foreach ($currencies as $currency) {
    $catalogCodes[(string) $currency['code']] = true;
}

$displayBaseCurrency = $requestedDisplayBaseCurrency !== '' ? $requestedDisplayBaseCurrency : $savedDisplayBaseCurrency;
if ($displayBaseCurrency === '' || (!isset($catalogCodes[$displayBaseCurrency]) && $preferredCurrencies !== [])) {
    $displayBaseCurrency = $savedDisplayBaseCurrency !== '' ? $savedDisplayBaseCurrency : (string) ($preferredCurrencies[0] ?? 'EUR');
}

$tableCurrencies = [];
foreach ([$displayBaseCurrency, ...$preferredCurrencies] as $currency) {
    $currency = strtoupper(trim((string) $currency));
    if ($currency !== '' && !in_array($currency, $tableCurrencies, true)) {
        $tableCurrencies[] = $currency;
    }
}

$currencyPageData = json_encode([
    'currencies' => $currencies,
    'preferred_currencies' => array_values(array_unique(array_map(static fn (mixed $code): string => strtoupper(trim((string) $code)), $preferredCurrencies))),
    'display_base_currency' => $displayBaseCurrency,
    'saved_display_base_currency' => $savedDisplayBaseCurrency,
], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);

$tabs = [
    ['label' => 'Ueberblick', 'href' => '/module/fx-rates'],
    ['label' => 'Waehrungen', 'href' => '/module/fx-rates/currencies', 'active' => true],
];
?>
<div id="fx-rates-currencies" data-page='<?= e(is_string($currencyPageData) ? $currencyPageData : '{}') ?>'>
  <div class="submenu-box">
    <div class="fx-submenu-row">
      <nav class="module-tabs" aria-label="Unterseiten von Waehrungskurse">
        <?php foreach ($tabs as $tab): ?>
          <a
            class="<?= !empty($tab['active']) ? 'module-button module-button--tab-active' : 'module-button module-button--tab' ?>"
            href="<?= e((string) $tab['href']) ?>"
          ><?= e((string) $tab['label']) ?></a>
        <?php endforeach; ?>
      </nav>
      <div class="module-submenu-actions">
        <a class="module-button module-button--secondary module-button--small" href="/modules/setup/fx-rates">Setup</a>
      </div>
    </div>
  </div>

  <?php if ($notice !== ''): ?>
    <section class="section-box">
      <div class="fx-message is-success"><?= e($notice) ?></div>
    </section>
  <?php elseif ($error !== ''): ?>
    <section class="section-box">
      <div class="fx-message is-error"><?= e($error) ?></div>
    </section>
  <?php endif; ?>

  <section class="section-box">
    <div class="fx-section-head">
      <div>
        <h2>Waehrungs-Update</h2>
        <p>Auswahl wird in den Waehrungskurs-Einstellungen gespeichert und steht damit auf Handy und Desktop gleich zur Verfuegung.</p>
      </div>
    </div>

    <div class="fx-action-row">
      <form method="post">
        <input type="hidden" name="fx_action" value="refresh_rates">
        <button type="submit" class="module-button module-button--primary">Alle Wechselkurse aktualisieren</button>
      </form>
      <form method="post">
        <input type="hidden" name="fx_action" value="sync_catalog">
        <button type="submit" class="module-button module-button--ghost">Waehrungskatalog sync</button>
      </form>
    </div>
  </section>

  <div class="fx-card-grid">
    <section class="card-box">
      <div class="fx-mini-label">Fiat</div>
      <div class="fx-card-value"><?= e((string) $fiatCount) ?> Waehrungen</div>
    </section>
    <section class="card-box">
      <div class="fx-mini-label">Krypto</div>
      <div class="fx-card-value"><?= e((string) $cryptoCount) ?> Waehrungen</div>
    </section>
  </div>

  <section class="section-box">
    <div class="fx-field-label">Bevorzugte Waehrungen fuer Anzeige</div>
    <div class="fx-currency-selection-row">
      <div class="fx-token-list fx-token-list--inline" data-fx-token-list></div>
      <div class="fx-currency-search">
        <input type="text" class="fx-input" value="" placeholder="Waehrung hinzufuegen: EUR, USD, DOGE oder Euro" autocomplete="off" data-fx-search-input>
      </div>
    </div>
    <div class="fx-suggestion-list" data-fx-suggestions></div>

    <div class="fx-field fx-currency-search">
      <label class="fx-field-label" for="fx-display-base-select">Darstellung auf Basis von</label>
      <select id="fx-display-base-select" class="fx-select" data-fx-display-base-select></select>
    </div>

    <div class="fx-save-row">
      <form method="post">
        <input type="hidden" name="fx_action" value="save_selection">
        <input type="hidden" name="display_base_currency" value="<?= e($displayBaseCurrency) ?>" data-fx-display-base-hidden>
        <div data-fx-hidden-preferred></div>
        <button type="submit" class="module-button module-button--ghost">Auswahl speichern</button>
      </form>
    </div>
  </section>

  <section class="section-box">
    <div class="fx-card-head">
      <div>
        <h2>Letzte 15 Kurs-Uploads</h2>
        <p>Zeigt die zuletzt gespeicherten Wechselkurse aus der Datenbank.</p>
      </div>
      <div class="fx-card-meta">
        <div><strong>Anzeige-Basis:</strong> <?= e($displayBaseCurrency) ?></div>
        <div><strong>Letzter Abruf:</strong> <?= e((string) ($latest['fetched_at_display'] ?? $latest['fetched_at'] ?? 'noch keiner')) ?></div>
      </div>
    </div>
    <div class="fx-table-wrap">
      <table class="fx-table">
        <thead>
          <tr>
            <th>Zeit</th>
            <?php foreach ($tableCurrencies as $currency): ?>
              <th><?= e((string) $currency) ?></th>
            <?php endforeach; ?>
          </tr>
        </thead>
        <tbody>
          <?php if ($recentFetches === []): ?>
            <tr><td colspan="<?= 1 + count($tableCurrencies) ?>">Noch keine Abrufe vorhanden.</td></tr>
          <?php else: ?>
            <?php foreach ($recentFetches as $fetch): ?>
              <?php
                $fetchBaseCurrency = strtoupper(trim((string) ($fetch['base_currency'] ?? '')));
                $snapshot = $service->snapshotByFetchId((int) ($fetch['id'] ?? 0), $fetchBaseCurrency, $tableCurrencies);
                $originalRates = is_array($snapshot['rates'] ?? null) ? $snapshot['rates'] : [];
                $displayBaseRate = $displayBaseCurrency === $fetchBaseCurrency
                    ? 1.0
                    : (is_numeric($originalRates[$displayBaseCurrency] ?? null) ? (float) $originalRates[$displayBaseCurrency] : null);
                $tableRates = [];
                foreach ($tableCurrencies as $currency) {
                    $currency = strtoupper(trim((string) $currency));
                    if ($currency === '') {
                        continue;
                    }
                    if ($currency === $displayBaseCurrency) {
                        $tableRates[$currency] = 1.0;
                        continue;
                    }
                    if ($displayBaseRate === null || $displayBaseRate <= 0) {
                        $tableRates[$currency] = null;
                        continue;
                    }
                    if ($currency === $fetchBaseCurrency) {
                        $tableRates[$currency] = 1 / $displayBaseRate;
                        continue;
                    }
                    $rawRate = $originalRates[$currency] ?? null;
                    $tableRates[$currency] = is_numeric($rawRate) ? ((float) $rawRate / $displayBaseRate) : null;
                }
                $infoTitle = sprintf(
                    'Basis: %s | Provider: %s | Ausloeser: %s',
                    (string) ($fetch['base_currency'] ?? '-'),
                    (string) ($fetch['provider'] ?? '-'),
                    (string) ($fetch['trigger_source_label'] ?? $fetch['trigger_source'] ?? '-')
                );
              ?>
              <tr>
                <td>
                  <div class="fx-history-date">
                    <span><?= e((string) ($fetch['fetched_at_display'] ?? $fetch['fetched_at'] ?? '')) ?></span>
                    <button
                      type="button"
                      class="fx-info-button"
                      title="<?= e($infoTitle) ?>"
                      aria-label="<?= e('Abrufinfo fuer ' . (string) ($fetch['fetched_at_display'] ?? $fetch['fetched_at'] ?? '')) ?>"
                    >i</button>
                  </div>
                </td>
                <?php foreach ($tableCurrencies as $currency): ?>
                  <?php $value = $tableRates[(string) $currency] ?? null; ?>
                  <td><?= is_numeric($value) ? e(number_format((float) $value, 8, ',', '')) : '–' ?></td>
                <?php endforeach; ?>
              </tr>
            <?php endforeach; ?>
          <?php endif; ?>
        </tbody>
      </table>
    </div>
  </section>
</div>