<?php
session_start();
if (!isset($_SESSION['user_id'])) {
    header("Location: login.php");
    exit();
}

$mysqli = new mysqli('localhost', 'admin_valucrm', 'RCMvalus1994!', 'admin_valucrm');
if ($mysqli->connect_error) {
    die("Connessione fallita: " . $mysqli->connect_error);
}

// Dati utente loggato
$user_id  = (int)$_SESSION['user_id'];
$username = $_SESSION['username'];
$is_admin = ($username === 'valutatoreAuto');

// Status particolari
$ACTIVE_STATUS      = 'Cliente attivo';
$PROTECTED_STATUSES = ['Cliente attivo', 'Demo in corso'];

// =======================
// == Handle POST (RIASSEGNA) ==
// =======================
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $action = $_POST['action'] ?? '';

    if ($action === 'reassign_self' || $action === 'reassign_admin') {
        $client_id = isset($_POST['client_id']) && ctype_digit((string)$_POST['client_id'])
            ? (int)$_POST['client_id']
            : 0;

        if ($client_id <= 0) {
            header("Location: " . $_SERVER['REQUEST_URI']);
            exit();
        }

        // Carico record cliente
        $stmt = $mysqli->prepare("SELECT id, user_id, status, last_modified FROM clients WHERE id = ?");
        $stmt->bind_param('i', $client_id);
        $stmt->execute();
        $res    = $stmt->get_result();
        $client = $res->fetch_assoc();
        $stmt->close();

        if (!$client) {
            header("Location: " . $_SERVER['REQUEST_URI']);
            exit();
        }

        $owner_id = (int)$client['user_id'];
        $status   = trim((string)$client['status']);

        // Calcolo giorni trascorsi da last_modified
        $days_since_last = null;
        if (!empty($client['last_modified'])) {
            $ts = strtotime($client['last_modified']);
            if ($ts !== false) {
                $days_since_last = (int)floor((time() - $ts) / 86400);
            }
        }

        // === RIASSEGNA A SE STESSO (UTENTE / ANCHE ADMIN SE VUOLE) ===
        if ($action === 'reassign_self') {
            $can_reassign = true;

            // Non puoi riassegnare se è già tuo
            if ($owner_id === $user_id) {
                $can_reassign = false;
            }
            // Solo se NON in stati protetti
            if (in_array($status, $PROTECTED_STATUSES, true)) {
                $can_reassign = false;
            }
            // Solo se sono passati almeno 15 giorni dall'ultima modifica
            if ($days_since_last === null || $days_since_last < 15) {
                $can_reassign = false;
            }

            if ($can_reassign) {
                $upd = $mysqli->prepare("UPDATE clients SET user_id = ?, last_modified = NOW() WHERE id = ?");
                $upd->bind_param('ii', $user_id, $client_id);
                $upd->execute();
                $upd->close();
            }

            header("Location: " . $_SERVER['REQUEST_URI']);
            exit();
        }

        // === RIASSEGNA DA ADMIN A QUALSIASI UTENTE ===
        if ($action === 'reassign_admin' && $is_admin) {
            $target_user_id = isset($_POST['target_user_id']) && ctype_digit((string)$_POST['target_user_id'])
                ? (int)$_POST['target_user_id']
                : 0;

            if ($target_user_id > 0) {
                // opzionale: verifica che l'utente esista
                $check = $mysqli->prepare("SELECT id FROM users WHERE id = ? LIMIT 1");
                $check->bind_param('i', $target_user_id);
                $check->execute();
                $r = $check->get_result()->fetch_assoc();
                $check->close();

                if ($r) {
                    $upd = $mysqli->prepare("UPDATE clients SET user_id = ?, last_modified = NOW() WHERE id = ?");
                    $upd->bind_param('ii', $target_user_id, $client_id);
                    $upd->execute();
                    $upd->close();
                }
            }

            header("Location: " . $_SERVER['REQUEST_URI']);
            exit();
        }
    }
}

// =======================
// == Filtri GET        ==
// =======================

// Filtro utente: di default mostro i clienti dell'utente loggato
if (isset($_GET['filter_user'])) {
    $filter_user = $mysqli->real_escape_string($_GET['filter_user']);
} else {
    $filter_user = $mysqli->real_escape_string($username);
}

// Filtro status (facoltativo)
$filter_status = isset($_GET['filter_status'])
    ? $mysqli->real_escape_string($_GET['filter_status'])
    : '';

// Sort (aggiunto created_asc)
$allowed_sorts = ['created_desc', 'created_asc', 'last_modified_desc', 'last_modified_asc'];
$sort = isset($_GET['sort']) && in_array($_GET['sort'], $allowed_sorts, true)
    ? $_GET['sort']
    : 'created_desc';

switch ($sort) {
    case 'created_asc':
        $orderBy = "clients.created_at ASC";
        break;
    case 'last_modified_asc':
        $orderBy = "clients.last_modified ASC";
        break;
    case 'last_modified_desc':
        $orderBy = "clients.last_modified DESC";
        break;
    case 'created_desc':
    default:
        $orderBy = "clients.created_at DESC";
        break;
}

// Preleva lista utenti (per filtri + riassegnazione admin) e lista status per i dropdown
$users_for_filter = $mysqli->query("SELECT DISTINCT username FROM users ORDER BY username");

$users_for_assign = $mysqli->query("SELECT id, username FROM users ORDER BY username");
$users_assign_array = [];
if ($users_for_assign) {
    while ($u = $users_for_assign->fetch_assoc()) {
        $users_assign_array[] = $u;
    }
}

$status_list_rs = $mysqli->query("SELECT DISTINCT status FROM clients ORDER BY status");

// Costruisci WHERE dinamico
$where = [];

// Tutti possono filtrare per utente
if ($filter_user !== '') {
    $where[] = "users.username = '$filter_user'";
}

// Tutti possono filtrare per status
if ($filter_status !== '') {
    $where[] = "clients.status = '$filter_status'";
}

// Restrizione di visibilità per NON admin:
// - Possono vedere tutti i clienti tranne quelli con status 'Cliente attivo' che non sono loro.
// - I loro 'Cliente attivo' restano visibili.
if (!$is_admin) {
    $where[] = "(clients.status != '" . $mysqli->real_escape_string($ACTIVE_STATUS) . "' OR clients.user_id = $user_id)";
}

// Query clienti con join e filtri
$sql = "
    SELECT clients.*, users.username
    FROM clients
    JOIN users ON clients.user_id = users.id
";

if (!empty($where)) {
    $sql .= " WHERE " . implode(' AND ', $where);
}

$sql .= " ORDER BY $orderBy";

$result = $mysqli->query($sql);
if (!$result) {
    die("Errore nella query clienti: " . $mysqli->error);
}

// Calcola conteggi per summary (in base ai risultati effettivamente visibili)
$status_counts = [];
if ($result) {
    while ($r = $result->fetch_assoc()) {
        $st = $r['status'];
        if (!isset($status_counts[$st])) {
            $status_counts[$st] = 0;
        }
        $status_counts[$st]++;
    }
    // Riporta il puntatore del result set all'inizio per la stampa della tabella
    $result->data_seek(0);
}
?>
<!DOCTYPE html>
<html lang="it">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>ValuCRM - Dashboard</title>
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
    <link rel="stylesheet" href="assets/css/futuristic-theme.css">
    <style>
        .page-header {
            background: var(--color-white);
            border-bottom: 1px solid var(--color-border);
            padding: 1rem 0;
            margin-bottom: 1rem;
        }
        
        .page-title {
            font-size: 1.5rem;
            font-weight: 600;
            margin: 0;
            color: var(--color-text-primary);
        }
        
        .welcome-text {
            color: var(--color-text-secondary);
            font-size: 0.875rem;
            margin: 0;
        }
        
        .stats-summary {
            background: var(--color-white);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 0.75rem 1rem;
            margin-bottom: 1rem;
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
            align-items: center;
        }
        
        .stat-item {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        
        .stat-label {
            font-size: 0.8125rem;
            color: var(--color-text-tertiary);
        }
        
        .stat-value {
            font-size: 0.875rem;
            font-weight: 600;
            color: var(--color-primary);
        }
        
        .filters-bar {
            background: var(--color-white);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 0.75rem 1rem;
            margin-bottom: 1rem;
        }
        
        .table-container {
            width: 100%;
        }
        
        .table td.email-column,
        .table td.notes-column {
            max-width: 200px;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }
        
        .table td.email-column:hover,
        .table td.notes-column:hover {
            overflow: visible;
            white-space: normal;
            max-width: none;
            position: relative;
            z-index: 10;
        }
        
        .action-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 0.25rem;
        }
        
        .status-badge {
            display: inline-block;
            padding: 0.25rem 0.625rem;
            border-radius: var(--radius-full);
            font-size: 0.75rem;
            font-weight: 500;
            white-space: nowrap;
        }
        
        .status-active {
            background: var(--color-success-light);
            color: #065F46;
        }
        
        .status-demo {
            background: var(--color-warning-light);
            color: #92400E;
        }
        
        .status-default {
            background: var(--color-gray-100);
            color: var(--color-text-secondary);
        }
    </style>
</head>
<body>
<div class="dashboard-container">
    <div class="page-header">
        <div class="d-flex justify-content-between align-items-center flex-wrap gap-2">
            <div>
                <h1 class="page-title">Dashboard CRM</h1>
                <p class="welcome-text">Benvenuto, <strong><?php echo htmlspecialchars($username); ?></strong></p>
            </div>
            <div class="d-flex gap-2">
                <a href="index.php" class="btn btn-secondary btn-sm">Home</a>
                <a href="add_client.php" class="btn btn-success btn-sm">+ Aggiungi Cliente</a>
                <a href="riassunto_clienti.php" class="btn btn-secondary btn-sm">Riassunto</a>
            </div>
        </div>
    </div>

    <!-- Stats Summary -->
    <?php if (!empty($status_counts)): ?>
        <div class="stats-summary">
            <strong style="font-size: 0.875rem; color: var(--color-text-primary);">Riepilogo:</strong>
            <?php foreach ($status_counts as $st => $cnt): ?>
                <div class="stat-item">
                    <span class="stat-label"><?php echo htmlspecialchars($st); ?>:</span>
                    <span class="stat-value"><?php echo (int)$cnt; ?></span>
                </div>
            <?php endforeach; ?>
        </div>
    <?php endif; ?>

    <!-- Filters -->
    <div class="filters-bar">
        <div class="d-flex justify-content-between align-items-center flex-wrap gap-2">
            <div class="d-flex gap-2 flex-wrap">
                <!-- Filtro utente: visibile a tutti -->
                <form method="GET" id="form_user" class="mr-3 form-inline">
                    <label class="mr-2" for="filter_user">Filtra utente:</label>
                    <select name="filter_user" class="form-control form-control-sm"
                            onchange="document.getElementById('form_user').submit()">
                        <option value="">Tutti</option>
                        <?php if ($users_for_filter): ?>
                            <?php while ($u = $users_for_filter->fetch_assoc()): ?>
                                <?php $uname = $u['username']; ?>
                                <option value="<?php echo htmlspecialchars($uname); ?>"
                                    <?php if ($filter_user === $uname) echo 'selected'; ?>>
                                    <?php echo htmlspecialchars($uname); ?>
                                </option>
                            <?php endwhile; ?>
                        <?php endif; ?>
                    </select>
                    <?php if ($filter_status !== ''): ?>
                        <input type="hidden" name="filter_status"
                               value="<?php echo htmlspecialchars($filter_status); ?>">
                    <?php endif; ?>
                    <?php if ($sort !== ''): ?>
                        <input type="hidden" name="sort" value="<?php echo htmlspecialchars($sort); ?>">
                    <?php endif; ?>
                </form>

                <!-- Filtro status: visibile a tutti -->
                <form method="GET" id="form_status" class="mr-3 form-inline">
                    <?php if ($filter_user !== ''): ?>
                        <input type="hidden" name="filter_user"
                               value="<?php echo htmlspecialchars($filter_user); ?>">
                    <?php endif; ?>
                    <?php if ($sort !== ''): ?>
                        <input type="hidden" name="sort"
                               value="<?php echo htmlspecialchars($sort); ?>">
                    <?php endif; ?>
                    <label class="mr-2" for="filter_status">Filtra status:</label>
                    <select name="filter_status" class="form-control form-control-sm"
                            onchange="document.getElementById('form_status').submit()">
                        <option value="">Tutti</option>
                        <?php if ($status_list_rs): ?>
                            <?php while ($s = $status_list_rs->fetch_assoc()): ?>
                                <?php $st_val = $s['status']; ?>
                                <option value="<?php echo htmlspecialchars($st_val); ?>"
                                    <?php if ($filter_status === $st_val) echo 'selected'; ?>>
                                    <?php echo htmlspecialchars($st_val); ?>
                                </option>
                            <?php endwhile; ?>
                        <?php endif; ?>
                    </select>
                </form>

                <!-- Ordina per -->
                <form method="GET" id="form_sort" class="form-inline">
                    <?php if ($filter_user !== ''): ?>
                        <input type="hidden" name="filter_user"
                               value="<?php echo htmlspecialchars($filter_user); ?>">
                    <?php endif; ?>
                    <?php if ($filter_status !== ''): ?>
                        <input type="hidden" name="filter_status"
                               value="<?php echo htmlspecialchars($filter_status); ?>">
                    <?php endif; ?>
                    <label class="mr-2" for="sort">Ordina per:</label>
                    <select name="sort"
                            id="sort"
                            class="form-control form-control-sm"
                            onchange="document.getElementById('form_sort').submit()">
                        <option value="created_desc" <?php if ($sort === 'created_desc') echo 'selected'; ?>>
                            Data creazione (nuovi prima)
                        </option>
                        <option value="created_asc" <?php if ($sort === 'created_asc') echo 'selected'; ?>>
                            Data creazione (più vecchi prima)
                        </option>
                        <option value="last_modified_desc" <?php if ($sort === 'last_modified_desc') echo 'selected'; ?>>
                            Ultima modifica (recenti prima)
                        </option>
                        <option value="last_modified_asc" <?php if ($sort === 'last_modified_asc') echo 'selected'; ?>>
                            Ultima modifica (meno recenti prima)
                        </option>
                    </select>
                </form>
            </div>
        </div>

        </div>
    </div>

    <!-- Tabella clienti -->
    <div class="table-container">
        <div class="table-responsive">
            <table class="table table-striped table-bordered">
            <thead class="thead-dark">
            <tr>
                <th>Nome azienda</th>
                <th>Telefono</th>
                <th>Indirizzo</th>
                <th class="email-column">Email</th>
                <th>Status</th>
                <th>Aggiunto il</th>
                <th>Ultima modifica</th>
                <th>Caricato da</th>
                <th class="notes-column">Note</th>
                <th>Azione</th>
            </tr>
            </thead>
            <tbody>
            <?php if ($result && $result->num_rows > 0): ?>
                <?php while ($row = $result->fetch_assoc()): ?>
                    <?php
                        $row_owner_id = (int)$row['user_id'];
                        $row_status   = trim((string)$row['status']);
                        $is_owner     = ($row_owner_id === $user_id);

                        // Calcolo giorni da last_modified
                        $days_since_last = null;
                        if (!empty($row['last_modified'])) {
                            $ts = strtotime($row['last_modified']);
                            if ($ts !== false) {
                                $days_since_last = (int)floor((time() - $ts) / 86400);
                            }
                        }

                        // Regole riassegnazione per utente NON admin
                        $can_reassign_self = false;
                        if (!$is_admin) {
                            if (
                                !$is_owner
                                && !in_array($row_status, $PROTECTED_STATUSES, true)
                                && $days_since_last !== null
                                && $days_since_last >= 15
                            ) {
                                $can_reassign_self = true;
                            }
                        }

                        $last_mod_str = $row['last_modified']
                            ? date('d-m-Y H:i', strtotime($row['last_modified']))
                            : 'N/D';
                    ?>
                    <tr>
                        <td><?php echo htmlspecialchars($row['company_name']); ?></td>
                        <td><?php echo htmlspecialchars($row['phone_number']); ?></td>
                        <td><?php echo htmlspecialchars($row['address']); ?></td>
                        <td class="email-column"
                            title="<?php echo htmlspecialchars($row['email_contacted']); ?>">
                            <?php echo htmlspecialchars($row['email_contacted']); ?>
                        </td>
                        <td>
                            <?php 
                                $badge_class = 'status-default';
                                if ($row_status === 'Cliente attivo') {
                                    $badge_class = 'status-active';
                                } elseif ($row_status === 'Demo in corso') {
                                    $badge_class = 'status-demo';
                                }
                            ?>
                            <span class="status-badge <?php echo $badge_class; ?>">
                                <?php echo htmlspecialchars($row_status); ?>
                            </span>
                        </td>
                        <td><?php echo date('d-m-Y', strtotime($row['created_at'])); ?></td>
                        <td><?php echo htmlspecialchars($last_mod_str); ?></td>
                        <td><?php echo htmlspecialchars($row['username']); ?></td>
                        <td class="notes-column">
                            <span title="<?php echo htmlspecialchars($row['notes']); ?>">
                                <?php echo htmlspecialchars($row['notes']); ?>
                            </span>
                        </td>
                        <td>
                            <div class="action-buttons">
                                <?php if ($is_admin || $is_owner): ?>
                                    <a href="edit_client.php?client_id=<?php echo (int)$row['id']; ?>"
                                       class="btn btn-primary btn-sm">Modifica</a>
                                <?php endif; ?>

                                <?php if (!$is_admin && $can_reassign_self): ?>
                                    <form method="POST" style="margin: 0;">
                                        <input type="hidden" name="client_id" value="<?php echo (int)$row['id']; ?>">
                                        <button type="submit" name="action" value="reassign_self"
                                                class="btn btn-warning btn-sm">Riassegna</button>
                                    </form>
                                <?php endif; ?>

                                <?php if ($is_admin): ?>
                                    <form method="POST" style="margin: 0;">
                                        <input type="hidden" name="client_id" value="<?php echo (int)$row['id']; ?>">
                                        <div class="input-group input-group-sm" style="min-width: 180px;">
                                            <select name="target_user_id" class="form-control" style="font-size: 0.75rem;">
                                                <?php foreach ($users_assign_array as $ua): ?>
                                                    <option value="<?php echo (int)$ua['id']; ?>"
                                                        <?php if ((int)$ua['id'] === $row_owner_id) echo 'selected'; ?>>
                                                        <?php echo htmlspecialchars($ua['username']); ?>
                                                    </option>
                                                <?php endforeach; ?>
                                            </select>
                                            <div class="input-group-append">
                                                <button type="submit" name="action" value="reassign_admin"
                                                        class="btn btn-warning btn-sm">OK</button>
                                            </div>
                                        </div>
                                    </form>
                                <?php endif; ?>
                            </div>
                        </td>
                    </tr>
                <?php endwhile; ?>
            <?php else: ?>
                <tr>
                    <td colspan="10" class="text-center">Nessun cliente trovato.</td>
                </tr>
            <?php endif; ?>
            </tbody>
            </table>
        </div>
    </div>
</div>
</body>
</html>