<?php
/**
 * dashboard/admin/consultant-clients.php
 *
 * Admin tool: assign client_records to consultant accounts.
 *
 * POST actions (CSRF protected):
 *   action=assign  consultant_id + client_id  → insert into consultant_clients
 *   action=remove  assignment_id              → delete from consultant_clients
 *   action=set_type user_id + user_type       → update users.user_type
 */

require_once __DIR__ . '/../../config/database.php';
require_once __DIR__ . '/../../lib/auth.php';
require_once __DIR__ . '/../../lib/csrf.php';

if (session_status() === PHP_SESSION_NONE) {
    session_start();
}

requireAdmin();

$pdo     = getDBConnection();
$flash   = '';
$flashType = 'success';

// ── POST handler ──────────────────────────────────────────────────────────────
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    if (!verifyCsrfToken($_POST['csrf_token'] ?? '')) {
        $flash     = 'Invalid request token. Please try again.';
        $flashType = 'danger';
    } else {
        $action = $_POST['action'] ?? '';

        if ($action === 'assign') {
            $consultantId = (int) ($_POST['consultant_id'] ?? 0);
            $clientId     = (int) ($_POST['client_id']     ?? 0);
            if ($consultantId && $clientId) {
                try {
                    $pdo->prepare("
                        INSERT IGNORE INTO consultant_clients (consultant_id, client_id, assigned_by)
                        VALUES (?, ?, ?)
                    ")->execute([$consultantId, $clientId, getCurrentUserId()]);
                    $flash = 'Client assigned successfully.';
                } catch (PDOException $e) {
                    $flash     = 'Assignment failed: ' . htmlspecialchars($e->getMessage(), ENT_QUOTES, 'UTF-8');
                    $flashType = 'danger';
                }
            } else {
                $flash     = 'Please select both a consultant and a client.';
                $flashType = 'warning';
            }

        } elseif ($action === 'remove') {
            $assignmentId = (int) ($_POST['assignment_id'] ?? 0);
            if ($assignmentId) {
                $pdo->prepare("DELETE FROM consultant_clients WHERE id = ?")->execute([$assignmentId]);
                $flash = 'Assignment removed.';
            }

        } elseif ($action === 'set_type') {
            $targetUserId = (int) ($_POST['user_id']    ?? 0);
            $userType     = $_POST['user_type'] ?? '';
            if ($targetUserId && in_array($userType, ['client', 'consultant', 'admin'], true)) {
                $pdo->prepare("UPDATE users SET user_type = ? WHERE id = ?")
                    ->execute([$userType, $targetUserId]);
                $flash = 'User type updated.';
            } else {
                $flash     = 'Invalid user type selection.';
                $flashType = 'warning';
            }
        }
    }
}

// ── Load data ─────────────────────────────────────────────────────────────────

// All users with their type
$allUsers = $pdo->query("
    SELECT id, fullname, email, user_type
    FROM users
    WHERE active = 1
    ORDER BY user_type, fullname
")->fetchAll();

// Consultants with their assigned clients
$consultants = $pdo->query("
    SELECT u.id, u.fullname, u.email
    FROM users u
    WHERE u.user_type IN ('consultant','admin') AND u.active = 1
    ORDER BY u.fullname
")->fetchAll();

// All client records (for the assign dropdown)
$allClients = $pdo->query("
    SELECT id, client, company
    FROM client_records
    ORDER BY client ASC
")->fetchAll();

// Assignments: consultant_id → [{assignment_id, client_id, client_name, company, assigned_at}]
$assignmentRows = $pdo->query("
    SELECT cc.id AS assignment_id, cc.consultant_id, cc.assigned_at,
           cr.id AS client_id, cr.client, cr.company
    FROM consultant_clients cc
    JOIN client_records cr ON cr.id = cc.client_id
    ORDER BY cc.consultant_id, cr.client
")->fetchAll();

$assignmentsByConsultant = [];
foreach ($assignmentRows as $row) {
    $assignmentsByConsultant[$row['consultant_id']][] = $row;
}

// ── Page render ───────────────────────────────────────────────────────────────

$pageTitle = 'Manage Consultants';
$siteName  = 'Crop Monitor';

include __DIR__ . '/../../layouts/header.php';
include __DIR__ . '/../../layouts/navbar.php';
?>

<div id="layoutSidenav">
    <div id="layoutSidenav_nav">
        <?php include __DIR__ . '/../../layouts/consultant-sidebar.php'; ?>
    </div>
    <div id="layoutSidenav_content">
        <main>
            <div class="container-fluid px-4">

                <h1 class="mt-4"><?= htmlspecialchars($pageTitle, ENT_QUOTES, 'UTF-8') ?></h1>
                <ol class="breadcrumb mb-4">
                    <li class="breadcrumb-item"><a href="/dashboard/consultant/index.php">Consultant</a></li>
                    <li class="breadcrumb-item active">Manage Consultants</li>
                </ol>

                <?php if ($flash): ?>
                <div class="alert alert-<?= $flashType ?> alert-dismissible fade show" role="alert">
                    <?= htmlspecialchars($flash, ENT_QUOTES, 'UTF-8') ?>
                    <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
                </div>
                <?php endif; ?>

                <div class="row g-4">

                    <!-- ══ LEFT: User roles ═══════════════════════════════════ -->
                    <div class="col-xl-4">
                        <div class="card shadow-sm border-0 h-100">
                            <div class="card-header fw-semibold">
                                <i class="fas fa-users-cog me-1"></i> User Roles
                            </div>
                            <div class="card-body p-0">
                                <table class="table table-sm table-hover mb-0 align-middle">
                                    <thead class="table-light">
                                        <tr>
                                            <th>Name</th>
                                            <th>Email</th>
                                            <th>Role</th>
                                            <th></th>
                                        </tr>
                                    </thead>
                                    <tbody>
                                    <?php foreach ($allUsers as $u): ?>
                                        <tr>
                                            <td class="fw-semibold small">
                                                <?= htmlspecialchars($u['fullname'], ENT_QUOTES, 'UTF-8') ?>
                                            </td>
                                            <td class="text-muted small">
                                                <?= htmlspecialchars($u['email'], ENT_QUOTES, 'UTF-8') ?>
                                            </td>
                                            <td>
                                                <?php
                                                $badge = match($u['user_type']) {
                                                    'admin'      => 'danger',
                                                    'consultant' => 'info',
                                                    default      => 'secondary',
                                                };
                                                ?>
                                                <span class="badge bg-<?= $badge ?>">
                                                    <?= htmlspecialchars(ucfirst($u['user_type']), ENT_QUOTES, 'UTF-8') ?>
                                                </span>
                                            </td>
                                            <td>
                                                <button class="btn btn-xs btn-sm btn-outline-secondary"
                                                        data-bs-toggle="modal"
                                                        data-bs-target="#modalSetType"
                                                        data-user-id="<?= (int)$u['id'] ?>"
                                                        data-user-name="<?= htmlspecialchars($u['fullname'], ENT_QUOTES, 'UTF-8') ?>"
                                                        data-user-type="<?= htmlspecialchars($u['user_type'], ENT_QUOTES, 'UTF-8') ?>">
                                                    Edit
                                                </button>
                                            </td>
                                        </tr>
                                    <?php endforeach; ?>
                                    </tbody>
                                </table>
                            </div>
                        </div>
                    </div>

                    <!-- ══ RIGHT: Consultant assignments ══════════════════════ -->
                    <div class="col-xl-8">

                        <!-- Assign form -->
                        <div class="card shadow-sm border-0 mb-4">
                            <div class="card-header fw-semibold">
                                <i class="fas fa-user-plus me-1"></i> Assign Client to Consultant
                            </div>
                            <div class="card-body">
                                <form method="POST" class="row g-2 align-items-end">
                                    <input type="hidden" name="csrf_token" value="<?= generateCsrfToken() ?>">
                                    <input type="hidden" name="action"     value="assign">

                                    <div class="col-md-5">
                                        <label class="form-label fw-semibold small">Consultant</label>
                                        <select name="consultant_id" class="form-select form-select-sm" required>
                                            <option value="">Select consultant…</option>
                                            <?php foreach ($consultants as $c): ?>
                                            <option value="<?= (int)$c['id'] ?>">
                                                <?= htmlspecialchars($c['fullname'], ENT_QUOTES, 'UTF-8') ?>
                                            </option>
                                            <?php endforeach; ?>
                                        </select>
                                    </div>

                                    <div class="col-md-5">
                                        <label class="form-label fw-semibold small">Client</label>
                                        <select name="client_id" class="form-select form-select-sm" required>
                                            <option value="">Select client…</option>
                                            <?php foreach ($allClients as $cl): ?>
                                            <option value="<?= (int)$cl['id'] ?>">
                                                <?= htmlspecialchars($cl['client'] . ($cl['company'] ? ' — ' . $cl['company'] : ''), ENT_QUOTES, 'UTF-8') ?>
                                            </option>
                                            <?php endforeach; ?>
                                        </select>
                                    </div>

                                    <div class="col-md-2">
                                        <button class="btn btn-success btn-sm w-100" type="submit">
                                            <i class="fas fa-plus me-1"></i>Assign
                                        </button>
                                    </div>
                                </form>
                            </div>
                        </div>

                        <!-- Current assignments per consultant -->
                        <?php if (empty($consultants)): ?>
                            <div class="alert alert-info">
                                No consultant accounts yet. Set a user's role to "Consultant" using the panel on the left.
                            </div>
                        <?php else: ?>
                        <?php foreach ($consultants as $con):
                            $assigned = $assignmentsByConsultant[$con['id']] ?? [];
                        ?>
                        <div class="card shadow-sm border-0 mb-3">
                            <div class="card-header d-flex justify-content-between align-items-center">
                                <span class="fw-semibold">
                                    <i class="fas fa-user-tie me-1 text-info"></i>
                                    <?= htmlspecialchars($con['fullname'], ENT_QUOTES, 'UTF-8') ?>
                                    <span class="text-muted fw-normal small ms-1">
                                        <?= htmlspecialchars($con['email'], ENT_QUOTES, 'UTF-8') ?>
                                    </span>
                                </span>
                                <span class="badge bg-secondary"><?= count($assigned) ?> client<?= count($assigned) !== 1 ? 's' : '' ?></span>
                            </div>

                            <?php if (empty($assigned)): ?>
                                <div class="card-body text-muted small">No clients assigned yet.</div>
                            <?php else: ?>
                            <ul class="list-group list-group-flush">
                                <?php foreach ($assigned as $a): ?>
                                <li class="list-group-item d-flex justify-content-between align-items-center py-2">
                                    <div>
                                        <span class="fw-semibold">
                                            <?= htmlspecialchars($a['client'], ENT_QUOTES, 'UTF-8') ?>
                                        </span>
                                        <?php if ($a['company']): ?>
                                            <span class="text-muted small ms-1">
                                                — <?= htmlspecialchars($a['company'], ENT_QUOTES, 'UTF-8') ?>
                                            </span>
                                        <?php endif; ?>
                                        <div class="text-muted" style="font-size:.72rem">
                                            Assigned <?= date('j M Y', strtotime($a['assigned_at'])) ?>
                                        </div>
                                    </div>
                                    <form method="POST" class="d-inline"
                                          onsubmit="return confirm('Remove this client assignment?')">
                                        <input type="hidden" name="csrf_token"     value="<?= generateCsrfToken() ?>">
                                        <input type="hidden" name="action"         value="remove">
                                        <input type="hidden" name="assignment_id"  value="<?= (int)$a['assignment_id'] ?>">
                                        <button class="btn btn-sm btn-outline-danger" type="submit">
                                            <i class="fas fa-times"></i>
                                        </button>
                                    </form>
                                </li>
                                <?php endforeach; ?>
                            </ul>
                            <?php endif; ?>
                        </div>
                        <?php endforeach; ?>
                        <?php endif; ?>

                    </div>
                </div><!-- /.row -->
            </div>
        </main>
    </div>
</div>

<!-- ── Modal: set user type ───────────────────────────────────────────────── -->
<div class="modal fade" id="modalSetType" tabindex="-1">
    <div class="modal-dialog modal-sm">
        <div class="modal-content">
            <form method="POST">
                <input type="hidden" name="csrf_token" value="<?= generateCsrfToken() ?>">
                <input type="hidden" name="action"     value="set_type">
                <input type="hidden" name="user_id"    id="modalUserId">
                <div class="modal-header">
                    <h5 class="modal-title">Change Role</h5>
                    <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
                </div>
                <div class="modal-body">
                    <p class="mb-2 text-muted small" id="modalUserName"></p>
                    <label class="form-label fw-semibold">User Type</label>
                    <select name="user_type" id="modalUserType" class="form-select">
                        <option value="client">Client</option>
                        <option value="consultant">Consultant</option>
                        <option value="admin">Admin</option>
                    </select>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-secondary btn-sm" data-bs-dismiss="modal">Cancel</button>
                    <button type="submit" class="btn btn-primary btn-sm">Save</button>
                </div>
            </form>
        </div>
    </div>
</div>

<script>
document.getElementById('modalSetType').addEventListener('show.bs.modal', function (e) {
    const btn  = e.relatedTarget;
    document.getElementById('modalUserId').value   = btn.dataset.userId;
    document.getElementById('modalUserName').textContent = btn.dataset.userName;
    document.getElementById('modalUserType').value  = btn.dataset.userType;
});
</script>

<?php include __DIR__ . '/../../layouts/footer.php'; ?>