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

$pdo = getPDO();

$q        = trim((string)($_GET['q'] ?? ''));
$parent   = trim((string)($_GET['parent'] ?? ''));
$baseYear = '2011-12'; // v1 is single base-year

// Build the full path from a commodity up to the root, for breadcrumbs
if (!function_exists('pathTo')) {
function pathTo(PDO $pdo, string $code, string $baseYear): array
{
    $out = [];
    $seen = 0;
    $cur = $code;
    while ($cur !== null && $cur !== '' && $seen++ < 10) {
        $s = $pdo->prepare('SELECT comm_code, comm_name, level, parent_code FROM commodities WHERE comm_code=? AND base_year=?');
        $s->execute([$cur, $baseYear]);
        $row = $s->fetch();
        if (!$row) break;
        array_unshift($out, $row);
        $cur = $row['parent_code'];
    }
    return $out;
}
}

$results = [];
$children = [];
$currentNode = null;
$crumbs = [];

if ($q !== '') {
    // Wild-text search across name / code
    $like = '%' . $q . '%';
    $stmt = $pdo->prepare(
        'SELECT comm_code, comm_name, level, parent_code, comm_wt
           FROM commodities
          WHERE base_year=:b AND (comm_name LIKE :qn OR comm_code LIKE :qc)
          ORDER BY level, comm_name
          LIMIT 200'
    );
    $stmt->execute([':b' => $baseYear, ':qn' => $like, ':qc' => $like]);
    $results = $stmt->fetchAll();
} else {
    // Hierarchical browse
    if ($parent === '') {
        // Top of tree: all commodities with parent_code IS NULL
        $stmt = $pdo->prepare(
            'SELECT comm_code, comm_name, level, parent_code, comm_wt
               FROM commodities
              WHERE base_year=:b AND parent_code IS NULL
              ORDER BY comm_code'
        );
        $stmt->execute([':b' => $baseYear]);
        $children = $stmt->fetchAll();
    } else {
        $s = $pdo->prepare('SELECT * FROM commodities WHERE comm_code=? AND base_year=?');
        $s->execute([$parent, $baseYear]);
        $currentNode = $s->fetch();

        $stmt = $pdo->prepare(
            'SELECT comm_code, comm_name, level, parent_code, comm_wt
               FROM commodities
              WHERE base_year=:b AND parent_code=:p
              ORDER BY comm_code'
        );
        $stmt->execute([':b' => $baseYear, ':p' => $parent]);
        $children = $stmt->fetchAll();
        $crumbs = pathTo($pdo, $parent, $baseYear);
    }
}

$pageTitle = 'Browse — Shaurya Index Factor';
require __DIR__ . '/includes/header.php';
?>

<div class="card mb-3"><div class="card-body">
    <form method="get" class="row g-2 align-items-end">
        <div class="col-md-8">
            <label class="form-label mb-1">Search by name or code</label>
            <input type="text" name="q" value="<?= h($q) ?>" class="form-control" placeholder="e.g. Ragi, Wheat, 1101010101">
        </div>
        <div class="col-md-2">
            <button class="btn btn-primary w-100">Search</button>
        </div>
        <div class="col-md-2">
            <a class="btn btn-outline-secondary w-100" href="<?= base_url('browse.php') ?>">Reset</a>
        </div>
    </form>
</div></div>

<?php if ($q !== ''): ?>
    <div class="card"><div class="card-body">
        <h5>Search results for "<?= h($q) ?>" (<?= count($results) ?>)</h5>
        <?php if (!$results): ?>
            <p class="text-muted mb-0">Nothing found.</p>
        <?php else: ?>
            <div class="table-responsive">
            <table class="table table-sm align-middle">
                <thead><tr><th>Level</th><th>Code</th><th>Name</th><th>Full path</th><th class="text-end">Weight</th><th></th></tr></thead>
                <tbody>
                <?php foreach ($results as $r):
                    $path = pathTo($pdo, $r['comm_code'], $baseYear);
                    $pathStr = implode(' &gt; ', array_map(fn($p) => h($p['comm_name']), $path));
                ?>
                    <tr class="level-<?= (int)$r['level'] ?>">
                        <td>L<?= (int)$r['level'] ?></td>
                        <td><code class="code-chip"><?= h($r['comm_code']) ?></code></td>
                        <td><?= h($r['comm_name']) ?></td>
                        <td class="path-crumb"><?= $pathStr ?></td>
                        <td class="text-end"><?= $r['comm_wt']!==null ? number_format((float)$r['comm_wt'],4) : '' ?></td>
                        <td>
                            <a class="btn btn-sm btn-outline-primary" href="<?= base_url('view.php?code=' . urlencode($r['comm_code'])) ?>">View</a>
                        </td>
                    </tr>
                <?php endforeach; ?>
                </tbody>
            </table>
            </div>
        <?php endif; ?>
    </div></div>
<?php else: ?>
    <div class="card"><div class="card-body">
        <nav aria-label="breadcrumb">
            <ol class="breadcrumb">
                <li class="breadcrumb-item">
                    <a href="<?= base_url('browse.php') ?>">Root</a>
                </li>
                <?php foreach ($crumbs as $c):
                    $isLast = ($c['comm_code'] === ($currentNode['comm_code'] ?? null));
                ?>
                    <li class="breadcrumb-item <?= $isLast?'active':'' ?>">
                        <?php if (!$isLast): ?>
                            <a href="<?= base_url('browse.php?parent=' . urlencode($c['comm_code'])) ?>"><?= h($c['comm_name']) ?></a>
                        <?php else: ?>
                            <?= h($c['comm_name']) ?>
                        <?php endif; ?>
                    </li>
                <?php endforeach; ?>
            </ol>
        </nav>

        <?php if ($currentNode): ?>
            <div class="mb-3">
                <h5 class="mb-1"><?= h($currentNode['comm_name']) ?>
                    <small class="text-muted">Level <?= (int)$currentNode['level'] ?></small>
                </h5>
                <code class="code-chip"><?= h($currentNode['comm_code']) ?></code>
                <?php if ($currentNode['comm_wt'] !== null): ?>
                    &middot; weight <?= number_format((float)$currentNode['comm_wt'],4) ?>
                <?php endif; ?>
                &middot;
                <a href="<?= base_url('view.php?code=' . urlencode($currentNode['comm_code'])) ?>">View monthly history</a>
            </div>
        <?php endif; ?>

        <?php if (!$children): ?>
            <p class="text-muted mb-0">No children under this node. It's a leaf &mdash;
                <a href="<?= base_url('view.php?code=' . urlencode($currentNode['comm_code'])) ?>">view its history</a>.
            </p>
        <?php else: ?>
            <div class="table-responsive">
                <table class="table table-sm table-hover align-middle">
                    <thead><tr><th>Level</th><th>Code</th><th>Name</th><th class="text-end">Weight</th><th></th></tr></thead>
                    <tbody>
                    <?php foreach ($children as $c): ?>
                        <tr class="level-<?= (int)$c['level'] ?>">
                            <td>L<?= (int)$c['level'] ?></td>
                            <td><code class="code-chip"><?= h($c['comm_code']) ?></code></td>
                            <td>
                                <a href="<?= base_url('browse.php?parent=' . urlencode($c['comm_code'])) ?>">
                                    <?= h($c['comm_name']) ?>
                                </a>
                            </td>
                            <td class="text-end"><?= $c['comm_wt']!==null ? number_format((float)$c['comm_wt'],4) : '' ?></td>
                            <td>
                                <a class="btn btn-sm btn-outline-primary" href="<?= base_url('view.php?code=' . urlencode($c['comm_code'])) ?>">View</a>
                            </td>
                        </tr>
                    <?php endforeach; ?>
                    </tbody>
                </table>
            </div>
        <?php endif; ?>
    </div></div>
<?php endif; ?>

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