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

// Parsing ~145k rows via PhpSpreadsheet can take ~30s + RAM.
// upload_max_filesize, post_max_size, max_execution_time, memory_limit
// are set in .htaccess (ini_set can't change upload/post limits at runtime).
set_time_limit(300);
ini_set('memory_limit', '512M');

$errors = [];
$summary = null;
$uploadRow = null;

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $baseYear = trim($_POST['base_year'] ?? '2011-12');
    if (!isset($_FILES['file']) || $_FILES['file']['error'] !== UPLOAD_ERR_OK) {
        $errors[] = 'Please choose a file to upload. (Error code: '
            . ($_FILES['file']['error'] ?? 'no-file') . ')';
    } else {
        $origName = $_FILES['file']['name'];
        $tmp      = $_FILES['file']['tmp_name'];
        $size     = (int)$_FILES['file']['size'];

        $ext = strtolower(pathinfo($origName, PATHINFO_EXTENSION));
        if (!in_array($ext, ['xls', 'xlsx'], true)) {
            $errors[] = 'File must be an .xls or .xlsx Excel file.';
        }

        if (!$errors) {
            $uploadsDir = __DIR__ . '/uploads';
            if (!is_dir($uploadsDir)) {
                mkdir($uploadsDir, 0775, true);
            }
            $safeBase = preg_replace('/[^A-Za-z0-9._-]+/', '_', pathinfo($origName, PATHINFO_FILENAME));
            $stored   = date('Ymd_His') . '_' . $safeBase . '.' . $ext;
            $storedPath = $uploadsDir . DIRECTORY_SEPARATOR . $stored;

            if (!move_uploaded_file($tmp, $storedPath)) {
                $errors[] = 'Failed to save the uploaded file.';
            } else {
                $pdo = getPDO();
                // Create an upload log row (status=processing)
                $ins = $pdo->prepare(
                    'INSERT INTO uploads
                        (filename, stored_path, size_bytes, base_year, status, notes)
                     VALUES (:f, :p, :s, :b, :st, :n)'
                );
                $ins->execute([
                    ':f'  => $origName,
                    ':p'  => $storedPath,
                    ':s'  => $size,
                    ':b'  => $baseYear,
                    ':st' => 'processing',
                    ':n'  => null,
                ]);
                $uploadId = (int)$pdo->lastInsertId();

                try {
                    $importer = new Shaurya\ExcelImporter($pdo, $baseYear);
                    $summary = $importer->import($storedPath, $uploadId);

                    $upd = $pdo->prepare(
                        'UPDATE uploads SET
                            commodities_seen = :c,
                            periods_seen     = :p,
                            values_written   = :v,
                            latest_period    = :lp,
                            status           = :st,
                            notes            = :n
                         WHERE id = :id'
                    );
                    $upd->execute([
                        ':c'  => $summary['commodities_seen'],
                        ':p'  => $summary['periods_seen'],
                        ':v'  => $summary['values_written'],
                        ':lp' => $summary['latest_period'],
                        ':st' => 'completed',
                        ':n'  => 'Sheet: ' . $summary['sheet'],
                        ':id' => $uploadId,
                    ]);
                    $uploadRow = ['id' => $uploadId, 'filename' => $origName];
                } catch (\Throwable $e) {
                    $upd = $pdo->prepare(
                        'UPDATE uploads SET status=:st, notes=:n WHERE id=:id'
                    );
                    $upd->execute([
                        ':st' => 'failed',
                        ':n'  => $e->getMessage(),
                        ':id' => $uploadId,
                    ]);
                    $errors[] = 'Import failed: ' . $e->getMessage();
                }
            }
        }
    }
}

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

<div class="row g-4">
    <div class="col-lg-7">
        <div class="card">
            <div class="card-body">
                <h4 class="mb-3">Upload WPI Monthly Index File</h4>
                <p class="text-muted small">
                    Download the consolidated file from
                    <a href="https://eaindustry.nic.in/download_data_1112.asp" target="_blank" rel="noopener">
                        eaindustry.nic.in · WPI Download Data (2011&#8209;12 Series)
                    </a>
                    &mdash; under "Monthly Index Files" click
                    <em>From APR-2012 Onwards</em>. Upload the resulting
                    <code>monthly_index_YYYYMM.xls</code> file here.
                </p>

                <?php if ($errors): ?>
                    <div class="alert alert-danger">
                        <?php foreach ($errors as $e): ?>
                            <div><?= h($e) ?></div>
                        <?php endforeach; ?>
                    </div>
                <?php endif; ?>

                <?php if ($summary): ?>
                    <div class="alert alert-success">
                        <strong>Import successful.</strong>
                        <ul class="mb-0 mt-2">
                            <li>Sheet: <code><?= h($summary['sheet']) ?></code></li>
                            <li>Commodities upserted: <strong><?= (int)$summary['commodities_seen'] ?></strong></li>
                            <li>Months (periods) in file: <strong><?= (int)$summary['periods_seen'] ?></strong></li>
                            <li>Index values upserted: <strong><?= number_format((int)$summary['values_written']) ?></strong></li>
                            <li>Latest period: <code><?= h($summary['latest_period']) ?></code> <span class="text-muted">(last 2 months marked provisional)</span></li>
                        </ul>
                        <a href="<?= base_url('browse.php') ?>" class="btn btn-sm btn-primary mt-2">Browse data</a>
                    </div>
                <?php endif; ?>

                <form method="post" enctype="multipart/form-data" class="mt-3">
                    <div class="mb-3">
                        <label for="file" class="form-label">Excel file (.xls / .xlsx)</label>
                        <input type="file" name="file" id="file" accept=".xls,.xlsx" class="form-control" required>
                        <div class="form-text">Max 50 MB. Parsing takes ~30 seconds — please wait.</div>
                    </div>
                    <div class="mb-3">
                        <label for="base_year" class="form-label">Base Year</label>
                        <select name="base_year" id="base_year" class="form-select" style="max-width: 180px;">
                            <option value="2011-12" selected>2011-12 (current)</option>
                            <option value="2004-05">2004-05 (legacy)</option>
                        </select>
                    </div>
                    <button type="submit" class="btn btn-primary">Upload &amp; Import</button>
                </form>
            </div>
        </div>
    </div>

    <div class="col-lg-5">
        <div class="card">
            <div class="card-body">
                <h5>Recent uploads</h5>
                <?php
                $rows = getPDO()->query(
                    'SELECT id, filename, status, commodities_seen, values_written,
                            latest_period, uploaded_at
                       FROM uploads ORDER BY id DESC LIMIT 10'
                )->fetchAll();
                ?>
                <?php if (!$rows): ?>
                    <p class="text-muted small mb-0">No uploads yet.</p>
                <?php else: ?>
                    <div class="table-responsive">
                        <table class="table table-sm">
                            <thead>
                                <tr>
                                    <th>#</th>
                                    <th>File</th>
                                    <th>Status</th>
                                    <th class="text-end">Rows</th>
                                    <th>Latest</th>
                                </tr>
                            </thead>
                            <tbody>
                                <?php foreach ($rows as $r): ?>
                                <tr>
                                    <td><?= (int)$r['id'] ?></td>
                                    <td class="small"><?= h($r['filename']) ?><br>
                                        <span class="text-muted"><?= h($r['uploaded_at']) ?></span></td>
                                    <td>
                                        <?php
                                        $badge = ['completed'=>'success','processing'=>'warning','failed'=>'danger','pending'=>'secondary'];
                                        $cls = $badge[$r['status']] ?? 'secondary';
                                        ?>
                                        <span class="badge bg-<?= $cls ?>"><?= h($r['status']) ?></span>
                                    </td>
                                    <td class="text-end small"><?= number_format((int)$r['values_written']) ?></td>
                                    <td class="small"><code><?= h($r['latest_period']) ?></code></td>
                                </tr>
                                <?php endforeach; ?>
                            </tbody>
                        </table>
                    </div>
                <?php endif; ?>
            </div>
        </div>
    </div>
</div>

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