<?php
require __DIR__ . '/vendor/autoload.php';
require __DIR__ . '/includes/auth.php';
requireLogin();

$pdo = getPDO();
$code = trim((string)($_GET['code'] ?? ''));
$baseYear = '2011-12';

if ($code === '') {
    header('Location: ' . base_url('browse.php'));
    exit;
}

$s = $pdo->prepare('SELECT * FROM commodities WHERE comm_code=? AND base_year=?');
$s->execute([$code, $baseYear]);
$comm = $s->fetch();
if (!$comm) {
    http_response_code(404);
    $pageTitle = 'Not found';
    require __DIR__ . '/includes/header.php';
    echo '<div class="alert alert-warning">Commodity <code>' . h($code) . '</code> not found.</div>';
    require __DIR__ . '/includes/footer.php';
    exit;
}

// Build path
$path = [];
$cur = $comm;
$guard = 0;
while ($cur && $guard++ < 10) {
    array_unshift($path, $cur);
    if (!$cur['parent_code']) break;
    $ps = $pdo->prepare('SELECT * FROM commodities WHERE comm_code=? AND base_year=?');
    $ps->execute([$cur['parent_code'], $baseYear]);
    $cur = $ps->fetch();
}

// Load all monthly indices for this commodity, ordered
$stmt = $pdo->prepare(
    'SELECT period_year, period_month, index_value, is_provisional
       FROM monthly_indices
      WHERE comm_code=? AND base_year=?
      ORDER BY period_year, period_month'
);
$stmt->execute([$code, $baseYear]);
$rows = $stmt->fetchAll();

// Group by year → months for a pivot table
$byYear = [];
foreach ($rows as $r) {
    $byYear[(int)$r['period_year']][(int)$r['period_month']] = $r;
}
ksort($byYear);
$monthNames = ['','Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'];

$pageTitle = $comm['comm_name'] . ' — Shaurya Index Factor';
require __DIR__ . '/includes/header.php';
?>

<nav aria-label="breadcrumb">
    <ol class="breadcrumb">
        <li class="breadcrumb-item"><a href="<?= base_url('browse.php') ?>">Root</a></li>
        <?php foreach ($path as $p):
            $isLast = $p['comm_code'] === $comm['comm_code'];
        ?>
            <li class="breadcrumb-item <?= $isLast?'active':'' ?>">
                <?php if (!$isLast): ?>
                    <a href="<?= base_url('browse.php?parent=' . urlencode($p['comm_code'])) ?>"><?= h($p['comm_name']) ?></a>
                <?php else: ?>
                    <?= h($p['comm_name']) ?>
                <?php endif; ?>
            </li>
        <?php endforeach; ?>
    </ol>
</nav>

<div class="card mb-3"><div class="card-body">
    <h4 class="mb-1"><?= h($comm['comm_name']) ?></h4>
    <div>
        <code class="code-chip"><?= h($comm['comm_code']) ?></code>
        &middot; Level <?= (int)$comm['level'] ?>
        <?php if ($comm['comm_wt'] !== null): ?>
            &middot; weight <?= number_format((float)$comm['comm_wt'],4) ?>
        <?php endif; ?>
        &middot; base <?= h($comm['base_year']) ?>
    </div>
</div></div>

<div class="card"><div class="card-body">
    <h5 class="mb-3">Monthly Index History</h5>
    <?php if (!$byYear): ?>
        <p class="text-muted mb-0">No monthly data for this commodity yet.</p>
    <?php else: ?>
    <div class="table-responsive">
        <table class="table table-sm table-bordered align-middle text-end">
            <thead class="table-light">
                <tr>
                    <th class="text-start">Year</th>
                    <?php for ($m=1;$m<=12;$m++): ?>
                        <th><?= $monthNames[$m] ?></th>
                    <?php endfor; ?>
                </tr>
            </thead>
            <tbody>
                <?php foreach ($byYear as $y => $months): ?>
                    <tr>
                        <td class="text-start fw-semibold"><?= $y ?></td>
                        <?php for ($m=1;$m<=12;$m++):
                            $cell = $months[$m] ?? null;
                            $v = $cell['index_value'] ?? null;
                            $prov = $cell && (int)$cell['is_provisional'] === 1;
                        ?>
                            <td<?= $prov ? ' class="table-warning" title="Provisional"' : '' ?>>
                                <?= $v !== null ? number_format((float)$v, 2) : '&mdash;' ?>
                            </td>
                        <?php endfor; ?>
                    </tr>
                <?php endforeach; ?>
            </tbody>
        </table>
    </div>
    <div class="small text-muted mt-2">Yellow cells = provisional (last two reported months).</div>
    <?php endif; ?>
</div></div>

<?php require __DIR__ . '/includes/footer.php'; ?>