<?php
session_start();
require_once 'includes/auth.php';
requireAdmin();
require_once 'config/db.php';

$success = '';
$error   = '';

// ---- Handle Delete ----
if (isset($_GET['delete'])) {
    $del_id = (int) $_GET['delete'];
    // Prevent deleting yourself
    if ($del_id === (int) $_SESSION['user_id']) {
        $error = 'You cannot delete your own account.';
    } else {
        $pdo->prepare("DELETE FROM users WHERE id = ? AND role = 'technician'")->execute([$del_id]);
        $success = 'Technician deleted successfully.';
    }
}

// ---- Handle Add ----
$form = ['full_name' => '', 'username' => '', 'password' => ''];

if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['action']) && $_POST['action'] === 'add') {
    $form['full_name'] = trim($_POST['full_name'] ?? '');
    $form['username']  = trim($_POST['username']  ?? '');
    $form['password']  = $_POST['password'] ?? '';

    if ($form['full_name'] === '') {
        $error = 'Full name is required.';
    } elseif ($form['username'] === '') {
        $error = 'Username is required.';
    } elseif (strlen($form['password']) < 6) {
        $error = 'Password must be at least 6 characters.';
    } else {
        // Check duplicate username
        $dup = $pdo->prepare("SELECT id FROM users WHERE username = ?");
        $dup->execute([$form['username']]);
        if ($dup->fetch()) {
            $error = "Username \"{$form['username']}\" is already taken.";
        } else {
            $pdo->prepare(
                "INSERT INTO users (full_name, username, password, role) VALUES (?, ?, ?, 'technician')"
            )->execute([$form['full_name'], $form['username'], password_hash($form['password'], PASSWORD_DEFAULT)]);

            $success = "Technician \"{$form['full_name']}\" added successfully.";
            $form    = ['full_name' => '', 'username' => '', 'password' => ''];
        }
    }
}

// ---- Fetch all technicians ----
$technicians = $pdo->query(
    "SELECT u.id, u.full_name, u.username, u.created_at,
            COUNT(st.id) AS total_entries
     FROM   users u
     LEFT JOIN stock_transactions st ON st.user_id = u.id
     WHERE  u.role = 'technician'
     GROUP  BY u.id
     ORDER  BY u.full_name ASC"
)->fetchAll();

include 'includes/header.php';
?>

<div class="row mb-3 align-items-center">
    <div class="col">
        <h4 class="page-title"><i class="bi bi-people me-2 text-primary"></i>Manage Technicians</h4>
        <nav aria-label="breadcrumb">
            <ol class="breadcrumb">
                <li class="breadcrumb-item"><a href="dashboard.php">Dashboard</a></li>
                <li class="breadcrumb-item active">Technicians</li>
            </ol>
        </nav>
    </div>
</div>

<?php if ($success !== ''): ?>
<div class="alert alert-success alert-dismissible fade show d-flex align-items-center gap-2">
    <i class="bi bi-check-circle-fill"></i> <?= htmlspecialchars($success) ?>
    <button type="button" class="btn-close ms-auto" data-bs-dismiss="alert"></button>
</div>
<?php endif; ?>

<?php if ($error !== ''): ?>
<div class="alert alert-danger d-flex align-items-center gap-2">
    <i class="bi bi-exclamation-triangle-fill"></i> <?= htmlspecialchars($error) ?>
</div>
<?php endif; ?>

<div class="row g-4">

    <!-- ===== Add Technician Form ===== -->
    <div class="col-lg-4">
        <div class="card">
            <div class="card-header bg-primary text-white">
                <i class="bi bi-person-plus me-1"></i> Add New Technician
            </div>
            <div class="card-body">
                <form method="POST" action="" novalidate>
                    <input type="hidden" name="action" value="add">

                    <div class="mb-3">
                        <label class="form-label fw-semibold">
                            Full Name <span class="text-danger">*</span>
                        </label>
                        <input type="text" class="form-control" name="full_name"
                               value="<?= htmlspecialchars($form['full_name']) ?>"
                               placeholder="e.g., Rahim Uddin" required>
                    </div>

                    <div class="mb-3">
                        <label class="form-label fw-semibold">
                            Username <span class="text-danger">*</span>
                        </label>
                        <div class="input-group">
                            <span class="input-group-text"><i class="bi bi-person"></i></span>
                            <input type="text" class="form-control" name="username"
                                   value="<?= htmlspecialchars($form['username']) ?>"
                                   placeholder="e.g., rahim01" required>
                        </div>
                    </div>

                    <div class="mb-4">
                        <label class="form-label fw-semibold">
                            Password <span class="text-danger">*</span>
                        </label>
                        <div class="input-group">
                            <span class="input-group-text"><i class="bi bi-lock"></i></span>
                            <input type="password" class="form-control" name="password"
                                   id="techPwd" placeholder="Min. 6 characters" required>
                            <button type="button" class="btn btn-outline-secondary" id="toggleTechPwd">
                                <i class="bi bi-eye"></i>
                            </button>
                        </div>
                        <div class="form-text">Minimum 6 characters.</div>
                    </div>

                    <div class="d-grid">
                        <button type="submit" class="btn btn-primary fw-semibold">
                            <i class="bi bi-person-plus me-1"></i> Add Technician
                        </button>
                    </div>
                </form>
            </div>
        </div>
    </div>

    <!-- ===== Technician List ===== -->
    <div class="col-lg-8">
        <div class="card">
            <div class="card-header bg-secondary text-white">
                <i class="bi bi-people me-1"></i> Technician Accounts
                <span class="badge bg-light text-dark ms-1"><?= count($technicians) ?></span>
            </div>
            <div class="card-body p-0">
                <div class="table-responsive">
                    <table class="table table-hover mb-0 align-middle">
                        <thead>
                            <tr>
                                <th>#</th>
                                <th>Full Name</th>
                                <th>Username</th>
                                <th class="text-center">Total Entries</th>
                                <th>Created</th>
                                <th class="text-center">Actions</th>
                            </tr>
                        </thead>
                        <tbody>
                            <?php if (empty($technicians)): ?>
                            <tr>
                                <td colspan="6" class="text-center py-4 text-muted">
                                    <i class="bi bi-people fs-2 d-block mb-2"></i>
                                    No technicians yet. Add one using the form on the left.
                                </td>
                            </tr>
                            <?php else: ?>
                            <?php foreach ($technicians as $i => $t): ?>
                            <tr>
                                <td class="text-muted small"><?= $i + 1 ?></td>
                                <td class="fw-semibold"><?= htmlspecialchars($t['full_name']) ?></td>
                                <td>
                                    <span class="badge bg-light text-dark border">
                                        <i class="bi bi-person me-1"></i><?= htmlspecialchars($t['username']) ?>
                                    </span>
                                </td>
                                <td class="text-center">
                                    <a href="stock_history.php?submitted_by=<?= $t['id'] ?>"
                                       class="badge bg-info text-white text-decoration-none"
                                       title="View this technician's entries">
                                        <?= $t['total_entries'] ?> entries
                                    </a>
                                </td>
                                <td class="text-muted small">
                                    <?= date('d M Y', strtotime($t['created_at'])) ?>
                                </td>
                                <td class="text-center">
                                    <a href="manage_technicians.php?delete=<?= $t['id'] ?>"
                                       class="btn btn-sm btn-danger"
                                       onclick="return confirm('Delete technician \'<?= addslashes($t['full_name']) ?>\'? Their submission history will remain but won\'t be linked to any user.')">
                                        <i class="bi bi-trash"></i> Delete
                                    </a>
                                </td>
                            </tr>
                            <?php endforeach; ?>
                            <?php endif; ?>
                        </tbody>
                    </table>
                </div>
            </div>
        </div>
    </div>

</div>

<script>
document.getElementById('toggleTechPwd').addEventListener('click', function () {
    const pwd  = document.getElementById('techPwd');
    const icon = this.querySelector('i');
    if (pwd.type === 'password') {
        pwd.type = 'text';
        icon.classList.replace('bi-eye', 'bi-eye-slash');
    } else {
        pwd.type = 'password';
        icon.classList.replace('bi-eye-slash', 'bi-eye');
    }
});
</script>

<?php include 'includes/footer.php'; ?>