<?php
include('include/headscript.php');

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

if (!$user->hasRole('Admin') && !$user->hasRole('SuperUser')) {
    header('Location: import_dashboard.php');
    exit;
}

$db = DBHandlerSelect::getInstance();
$pdo = $db->getConnection();

/*
 * CSRF token.
 */
if (empty($_SESSION['routine_steps_csrf'])) {
    $_SESSION['routine_steps_csrf'] = bin2hex(random_bytes(32));
}
$csrfToken = $_SESSION['routine_steps_csrf'];

function cleanInput($value)
{
    return trim((string)($value ?? ''));
}

/*
 * Determina l'id routine dalla querystring (GET) o dal POST.
 */
$idroutine = 0;
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $idroutine = (int)($_POST['idroutine'] ?? 0);
} else {
    $idroutine = (int)($_GET['idroutine'] ?? 0);
}

function redirectToSteps($idroutine, $type, $message)
{
    $_SESSION['routine_steps_flash'] = [
        'type' => $type,
        'message' => $message
    ];
    header('Location: routine_steps.php?idroutine=' . (int)$idroutine);
    exit;
}

/*
 * Converte lettera colonna Excel in indice zero-based. Accetta anche numeri.
 * A=0, B=1, ... Z=25, AA=26, ...
 */
function colToIndex($ref)
{
    $ref = strtoupper(trim((string)$ref));
    if ($ref === '') {
        return null;
    }
    if (ctype_digit($ref)) {
        return (int)$ref;
    }
    $index = 0;
    $len = strlen($ref);
    for ($i = 0; $i < $len; $i++) {
        $c = $ref[$i];
        if ($c < 'A' || $c > 'Z') {
            return null;
        }
        $index = $index * 26 + (ord($c) - ord('A') + 1);
    }
    return $index - 1;
}

/*
 * Converte indice zero-based in lettera Excel (per mostrare gli step salvati).
 */
function indexToCol($index)
{
    $index = (int)$index;
    if ($index < 0) {
        return '';
    }
    $letters = '';
    $index += 1;
    while ($index > 0) {
        $rem = ($index - 1) % 26;
        $letters = chr(ord('A') + $rem) . $letters;
        $index = intdiv($index - 1, 26);
    }
    return $letters;
}

/*
 * Normalizza una stringa di colonne separate da virgola ("D, F, H") in
 * un array di indici zero-based, validando ogni riferimento.
 */
function parseColumnList($raw)
{
    $raw = trim((string)$raw);
    if ($raw === '') {
        return [];
    }
    $parts = preg_split('/[\s,;]+/', $raw);
    $out = [];
    foreach ($parts as $p) {
        if ($p === '') {
            continue;
        }
        $idx = colToIndex($p);
        if ($idx === null) {
            throw new Exception('Riferimento colonna non valido: "' . $p . '". Usa lettere come D, F, H.');
        }
        $out[] = $idx;
    }
    return $out;
}

/*
 * Verifica esistenza routine ed engine = 1.
 */
$routine = null;
if ($idroutine > 0) {
    $stmt = $pdo->prepare("SELECT idroutine, name, description, engine, headerrow FROM routine WHERE idroutine = :id LIMIT 1");
    $stmt->execute([':id' => $idroutine]);
    $routine = $stmt->fetch(PDO::FETCH_ASSOC);
}

if (!$routine) {
    $_SESSION['routine_admin_flash'] = ['type' => 'error', 'message' => 'Routine non trovata.'];
    header('Location: routine_admin.php');
    exit;
}

if ((int)$routine['engine'] !== 1) {
    $_SESSION['routine_admin_flash'] = ['type' => 'error', 'message' => 'Questa routine è di tipo File: gli step non sono configurabili da qui.'];
    header('Location: routine_admin.php');
    exit;
}

/*
 * Vocabolario operazioni disponibili (deve combaciare con gli handler di _engine.php).
 */
$operations = ['merge', 'copy', 'clear', 'trim', 'replace', 'uppercase', 'lowercase'];

/*
 * Gestione azioni POST.
 */
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    try {
        $postedToken = $_POST['csrf_token'] ?? '';
        if (!hash_equals($csrfToken, $postedToken)) {
            throw new Exception('Token di sicurezza non valido.');
        }

        $action = cleanInput($_POST['action'] ?? '');

        if ($action === 'create' || $action === 'update') {
            $operation = strtolower(cleanInput($_POST['operation'] ?? ''));
            $active    = (int)($_POST['active'] ?? 1) === 1 ? 1 : 0;

            if (!in_array($operation, $operations, true)) {
                throw new Exception('Operazione non valida.');
            }

            /*
             * Costruzione params in base all'operazione.
             * Le colonne arrivano come lettere e vengono convertite in indici.
             */
            $params = [];

            if ($operation === 'merge') {
                $sources = parseColumnList($_POST['source_columns'] ?? '');
                $target  = colToIndex($_POST['target_column'] ?? '');
                if (empty($sources)) {
                    throw new Exception('Indica almeno una colonna sorgente (es. D, F, H).');
                }
                if ($target === null) {
                    throw new Exception('Indica la colonna di destinazione (es. J).');
                }
                $params = [
                    'source_columns' => $sources,
                    'target_column'  => $target,
                    'separator'      => (string)($_POST['separator'] ?? ' '),
                    'skip_empty'     => isset($_POST['skip_empty']) ? true : false,
                ];
            } elseif ($operation === 'copy') {
                $src = colToIndex($_POST['source_column'] ?? '');
                $dst = colToIndex($_POST['target_column'] ?? '');
                if ($src === null || $dst === null) {
                    throw new Exception('Indica colonna sorgente e destinazione (es. D e J).');
                }
                $params = ['source_column' => $src, 'target_column' => $dst];
            } elseif ($operation === 'clear' || $operation === 'trim' || $operation === 'uppercase' || $operation === 'lowercase') {
                $cols = parseColumnList($_POST['columns'] ?? '');
                if (empty($cols)) {
                    throw new Exception('Indica almeno una colonna (es. D, F).');
                }
                $params = ['columns' => $cols];
                if ($operation === 'trim') {
                    $chars = (string)($_POST['chars'] ?? '');
                    if ($chars !== '') {
                        $params['chars'] = $chars;
                    }
                }
            } elseif ($operation === 'replace') {
                $cols = parseColumnList($_POST['columns'] ?? '');
                if (empty($cols)) {
                    throw new Exception('Indica almeno una colonna (es. D, F).');
                }
                $params = [
                    'columns' => $cols,
                    'search'  => (string)($_POST['search'] ?? ''),
                    'replace' => (string)($_POST['replace'] ?? ''),
                    'regex'   => isset($_POST['regex']) ? true : false,
                ];
            }

            $paramsJson = json_encode($params, JSON_UNESCAPED_UNICODE);

            if ($action === 'create') {
                // step_order = max + 1
                $stmt = $pdo->prepare("SELECT COALESCE(MAX(step_order), 0) + 1 AS next_order FROM routine_step WHERE idroutine = :id");
                $stmt->execute([':id' => $idroutine]);
                $nextOrder = (int)$stmt->fetchColumn();

                $stmt = $pdo->prepare("
                    INSERT INTO routine_step (idroutine, step_order, operation, params, active)
                    VALUES (:id, :ord, :op, :params, :active)
                ");
                $stmt->execute([
                    ':id'     => $idroutine,
                    ':ord'    => $nextOrder,
                    ':op'     => $operation,
                    ':params' => $paramsJson,
                    ':active' => $active,
                ]);

                redirectToSteps($idroutine, 'success', 'Step aggiunto correttamente.');
            } else {
                $idstep = (int)($_POST['idstep'] ?? 0);
                if ($idstep <= 0) {
                    throw new Exception('ID step non valido.');
                }
                $stmt = $pdo->prepare("
                    UPDATE routine_step
                       SET operation = :op, params = :params, active = :active
                     WHERE idstep = :idstep AND idroutine = :id
                ");
                $stmt->execute([
                    ':op'     => $operation,
                    ':params' => $paramsJson,
                    ':active' => $active,
                    ':idstep' => $idstep,
                    ':id'     => $idroutine,
                ]);

                redirectToSteps($idroutine, 'success', 'Step aggiornato correttamente.');
            }
        }

        if ($action === 'delete') {
            $idstep = (int)($_POST['idstep'] ?? 0);
            if ($idstep <= 0) {
                throw new Exception('ID step non valido.');
            }
            $stmt = $pdo->prepare("DELETE FROM routine_step WHERE idstep = :idstep AND idroutine = :id");
            $stmt->execute([':idstep' => $idstep, ':id' => $idroutine]);
            redirectToSteps($idroutine, 'success', 'Step eliminato.');
        }

        if ($action === 'move') {
            $idstep = (int)($_POST['idstep'] ?? 0);
            $dir    = cleanInput($_POST['direction'] ?? '');
            if ($idstep <= 0 || !in_array($dir, ['up', 'down'], true)) {
                throw new Exception('Parametri di spostamento non validi.');
            }

            // Carica step correnti ordinati.
            $stmt = $pdo->prepare("SELECT idstep, step_order FROM routine_step WHERE idroutine = :id ORDER BY step_order ASC, idstep ASC");
            $stmt->execute([':id' => $idroutine]);
            $all = $stmt->fetchAll(PDO::FETCH_ASSOC);

            // Trova posizione corrente.
            $pos = null;
            foreach ($all as $i => $s) {
                if ((int)$s['idstep'] === $idstep) {
                    $pos = $i;
                    break;
                }
            }

            if ($pos !== null) {
                $swapWith = $dir === 'up' ? $pos - 1 : $pos + 1;
                if ($swapWith >= 0 && $swapWith < count($all)) {
                    $a = $all[$pos];
                    $b = $all[$swapWith];
                    // Scambia gli step_order dei due record.
                    $upd = $pdo->prepare("UPDATE routine_step SET step_order = :ord WHERE idstep = :idstep AND idroutine = :id");
                    $upd->execute([':ord' => (int)$b['step_order'], ':idstep' => (int)$a['idstep'], ':id' => $idroutine]);
                    $upd->execute([':ord' => (int)$a['step_order'], ':idstep' => (int)$b['idstep'], ':id' => $idroutine]);
                }
            }

            redirectToSteps($idroutine, 'success', 'Ordine aggiornato.');
        }

        throw new Exception('Azione non valida.');
    } catch (Exception $e) {
        redirectToSteps($idroutine, 'error', $e->getMessage());
    }
}

/*
 * Caricamento step della routine.
 */
$stmt = $pdo->prepare("SELECT idstep, step_order, operation, params, active FROM routine_step WHERE idroutine = :id ORDER BY step_order ASC, idstep ASC");
$stmt->execute([':id' => $idroutine]);
$steps = $stmt->fetchAll(PDO::FETCH_ASSOC);

/*
 * Costruisce una descrizione leggibile dei params per la tabella.
 */
function describeStep($operation, array $p)
{
    $colsToLetters = function ($arr) {
        return implode(', ', array_map('indexToCol', $arr));
    };
    switch ($operation) {
        case 'merge':
            return 'Unisce ' . $colsToLetters($p['source_columns'] ?? []) .
                ' → ' . indexToCol($p['target_column'] ?? 0) .
                ' (sep: "' . ($p['separator'] ?? ' ') . '")';
        case 'copy':
            return 'Copia ' . indexToCol($p['source_column'] ?? 0) . ' → ' . indexToCol($p['target_column'] ?? 0);
        case 'clear':
            return 'Svuota ' . $colsToLetters($p['columns'] ?? []);
        case 'trim':
            return 'Trim ' . $colsToLetters($p['columns'] ?? []) . (isset($p['chars']) ? ' (chars: "' . $p['chars'] . '")' : '');
        case 'uppercase':
            return 'Maiuscolo ' . $colsToLetters($p['columns'] ?? []);
        case 'lowercase':
            return 'Minuscolo ' . $colsToLetters($p['columns'] ?? []);
        case 'replace':
            return 'Sostituisci in ' . $colsToLetters($p['columns'] ?? []) .
                ': "' . ($p['search'] ?? '') . '" → "' . ($p['replace'] ?? '') . '"' .
                (!empty($p['regex']) ? ' (regex)' : '');
        default:
            return $operation;
    }
}

/*
 * Prepara i dati step per il JS (params già in lettere per il form di modifica).
 */
$stepsForJs = [];
foreach ($steps as $s) {
    $p = json_decode($s['params'] ?? '[]', true);
    if (!is_array($p)) {
        $p = [];
    }
    // Converte indici -> lettere per il form.
    $letters = function ($arr) {
        return implode(', ', array_map('indexToCol', $arr));
    };
    $formData = ['operation' => $s['operation'], 'active' => (int)$s['active']];
    if ($s['operation'] === 'merge') {
        $formData['source_columns'] = $letters($p['source_columns'] ?? []);
        $formData['target_column']  = indexToCol($p['target_column'] ?? 0);
        $formData['separator']      = $p['separator'] ?? ' ';
        $formData['skip_empty']     = !empty($p['skip_empty']);
    } elseif ($s['operation'] === 'copy') {
        $formData['source_column'] = indexToCol($p['source_column'] ?? 0);
        $formData['target_column'] = indexToCol($p['target_column'] ?? 0);
    } elseif (in_array($s['operation'], ['clear', 'trim', 'uppercase', 'lowercase'], true)) {
        $formData['columns'] = $letters($p['columns'] ?? []);
        if ($s['operation'] === 'trim') {
            $formData['chars'] = $p['chars'] ?? '';
        }
    } elseif ($s['operation'] === 'replace') {
        $formData['columns'] = $letters($p['columns'] ?? []);
        $formData['search']  = $p['search'] ?? '';
        $formData['replace'] = $p['replace'] ?? '';
        $formData['regex']   = !empty($p['regex']);
    }
    $stepsForJs[(int)$s['idstep']] = $formData;
}

$flash = $_SESSION['routine_steps_flash'] ?? null;
unset($_SESSION['routine_steps_flash']);
?>
<!doctype html>
<html lang="it">

<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="icon" href="assets/images/favicon-32x32.png" type="image/png" />
    <?php include('cssinclude.php'); ?>

    <title>Step Routine - <?= htmlspecialchars($titlewebsite, ENT_QUOTES, 'UTF-8'); ?></title>

    <style>
        .small-muted {
            font-size: 12px;
            color: #6c757d;
        }

        .table-actions {
            white-space: nowrap;
        }

        .op-badge {
            font-family: Consolas, Monaco, monospace;
            font-size: 12px;
            background: #eef2ff;
            color: #4338ca;
            border: 1px solid #e0e7ff;
            border-radius: 6px;
            padding: 2px 8px;
            text-transform: uppercase;
        }

        .step-inactive {
            opacity: 0.55;
        }

        .col-hint {
            background: #f0fdf4;
            border: 1px solid #bbf7d0;
            color: #166534;
            border-radius: 8px;
            padding: 8px 12px;
            font-size: 13px;
        }

        .order-btns .btn {
            padding: 2px 8px;
        }
    </style>
</head>

<body>
    <div class="wrapper">
        <?php include('include/navbar.php'); ?>
        <?php include('include/topbar.php'); ?>

        <div class="page-wrapper">
            <div class="page-content">
                <?php include('top_stat_widget.php'); ?>

                <div class="card radius-10">
                    <div class="card-header">
                        <div class="d-flex align-items-center justify-content-between">
                            <div>
                                <h6 class="mb-0">Step routine: <?= htmlspecialchars($routine['name'], ENT_QUOTES, 'UTF-8'); ?></h6>
                                <small class="text-muted">
                                    Configura le operazioni applicate all'XLS. Vengono eseguite dall'alto verso il basso.
                                </small>
                            </div>
                            <div>
                                <a href="routine_admin.php" class="btn btn-light">
                                    <i class="bx bx-arrow-back"></i> Torna alle routine
                                </a>
                                <button type="button" class="btn btn-primary" id="btnAddStep">
                                    <i class="bx bx-plus"></i> Aggiungi step
                                </button>
                            </div>
                        </div>
                    </div>

                    <div class="card-body">
                        <div class="col-hint mb-3">
                            Le colonne si indicano con le <strong>lettere dell'Excel</strong> (A, B, C, …). Per più colonne separale con la virgola: <strong>D, F, H</strong>.
                        </div>

                        <div class="table-responsive">
                            <table class="table table-bordered align-middle">
                                <thead>
                                    <tr>
                                        <th style="width: 70px;">Ordine</th>
                                        <th style="width: 120px;">Operazione</th>
                                        <th>Dettaglio</th>
                                        <th style="width: 90px;">Stato</th>
                                        <th style="width: 240px;">Azioni</th>
                                    </tr>
                                </thead>
                                <tbody>
                                    <?php if (empty($steps)): ?>
                                        <tr>
                                            <td colspan="5" class="text-center small-muted py-4">
                                                Nessuno step configurato. Usa "Aggiungi step" per iniziare.
                                            </td>
                                        </tr>
                                    <?php else: ?>
                                        <?php foreach ($steps as $i => $s): ?>
                                            <?php
                                            $p = json_decode($s['params'] ?? '[]', true);
                                            if (!is_array($p)) {
                                                $p = [];
                                            }
                                            $isFirst = ($i === 0);
                                            $isLast  = ($i === count($steps) - 1);
                                            $rowClass = ((int)$s['active'] === 1) ? '' : 'step-inactive';
                                            ?>
                                            <tr class="<?= $rowClass; ?>">
                                                <td class="text-center">
                                                    <div class="order-btns d-inline-flex flex-column gap-1">
                                                        <button type="button" class="btn btn-sm btn-outline-secondary btnMove"
                                                            data-idstep="<?= (int)$s['idstep']; ?>" data-direction="up"
                                                            <?= $isFirst ? 'disabled' : ''; ?>>
                                                            <i class="bx bx-chevron-up"></i>
                                                        </button>
                                                        <button type="button" class="btn btn-sm btn-outline-secondary btnMove"
                                                            data-idstep="<?= (int)$s['idstep']; ?>" data-direction="down"
                                                            <?= $isLast ? 'disabled' : ''; ?>>
                                                            <i class="bx bx-chevron-down"></i>
                                                        </button>
                                                    </div>
                                                </td>
                                                <td><span class="op-badge"><?= htmlspecialchars($s['operation'], ENT_QUOTES, 'UTF-8'); ?></span></td>
                                                <td><?= htmlspecialchars(describeStep($s['operation'], $p), ENT_QUOTES, 'UTF-8'); ?></td>
                                                <td>
                                                    <?php if ((int)$s['active'] === 1): ?>
                                                        <span class="badge bg-success">Attivo</span>
                                                    <?php else: ?>
                                                        <span class="badge bg-secondary">Disattivo</span>
                                                    <?php endif; ?>
                                                </td>
                                                <td class="table-actions">
                                                    <button type="button" class="btn btn-sm btn-outline-primary btnEditStep"
                                                        data-idstep="<?= (int)$s['idstep']; ?>">
                                                        Modifica
                                                    </button>
                                                    <button type="button" class="btn btn-sm btn-outline-danger btnDeleteStep"
                                                        data-idstep="<?= (int)$s['idstep']; ?>">
                                                        Elimina
                                                    </button>
                                                </td>
                                            </tr>
                                        <?php endforeach; ?>
                                    <?php endif; ?>
                                </tbody>
                            </table>
                        </div>

                        <hr class="my-4">

                        <div class="d-flex align-items-center justify-content-between mb-2">
                            <div>
                                <h6 class="mb-0">Prova la routine</h6>
                                <small class="text-muted">Carica un XLS di esempio: viene mostrata la prima riga dati dopo l'intestazione, elaborata con gli step qui sopra. Il file non viene salvato.</small>
                            </div>
                        </div>

                        <div class="row g-2 align-items-end">
                            <div class="col-md-8">
                                <label for="previewFile" class="form-label">File XLS / XLSX di prova</label>
                                <input type="file" class="form-control" id="previewFile" accept=".xls,.xlsx">
                            </div>
                            <div class="col-md-4">
                                <button type="button" class="btn btn-outline-primary w-100" id="btnRunPreview">
                                    <i class="bx bx-play-circle"></i> Esegui anteprima
                                </button>
                            </div>
                        </div>

                        <div id="previewStatus" class="small-muted mt-2"></div>

                        <div class="table-responsive mt-3" id="previewResultWrapper" style="display:none;">
                            <table class="table table-bordered table-sm align-middle" id="previewTable">
                                <thead>
                                    <tr>
                                        <th style="width: 90px;">Colonna</th>
                                        <th style="width: 40%;">Intestazione</th>
                                        <th>Valore dopo la routine</th>
                                    </tr>
                                </thead>
                                <tbody></tbody>
                            </table>
                        </div>
                    </div>
                </div>

            </div>
        </div>

        <div class="overlay toggle-icon"></div>
        <a href="javaScript:;" class="back-to-top"><i class='bx bxs-up-arrow-alt'></i></a>
        <?php include('include/footer.php'); ?>
    </div>

    <!-- Modal Step -->
    <div class="modal fade" id="stepModal" tabindex="-1" aria-hidden="true">
        <div class="modal-dialog modal-lg modal-dialog-centered">
            <form method="POST" class="modal-content" id="stepForm">
                <input type="hidden" name="csrf_token" value="<?= htmlspecialchars($csrfToken, ENT_QUOTES, 'UTF-8'); ?>">
                <input type="hidden" name="idroutine" value="<?= (int)$idroutine; ?>">
                <input type="hidden" name="action" id="stepFormAction" value="create">
                <input type="hidden" name="idstep" id="idstep" value="">

                <div class="modal-header">
                    <h5 class="modal-title" id="stepModalTitle">Aggiungi step</h5>
                    <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Chiudi"></button>
                </div>

                <div class="modal-body">
                    <div class="row g-3">
                        <div class="col-md-8">
                            <label for="operation" class="form-label">Operazione *</label>
                            <select class="form-select" id="operation" name="operation" required>
                                <option value="merge">merge — unisci più colonne in una</option>
                                <option value="copy">copy — copia una colonna in un'altra</option>
                                <option value="clear">clear — svuota colonne</option>
                                <option value="trim">trim — rimuovi spazi</option>
                                <option value="replace">replace — sostituisci testo</option>
                                <option value="uppercase">uppercase — MAIUSCOLO</option>
                                <option value="lowercase">lowercase — minuscolo</option>
                            </select>
                        </div>

                        <div class="col-md-4">
                            <label for="active" class="form-label">Stato *</label>
                            <select class="form-select" id="active" name="active" required>
                                <option value="1">Attivo</option>
                                <option value="0">Disattivo</option>
                            </select>
                        </div>

                        <!-- Campi MERGE -->
                        <div class="col-md-8 op-field op-merge">
                            <label class="form-label">Colonne sorgente *</label>
                            <input type="text" class="form-control" name="source_columns" id="merge_source" placeholder="es. D, F, H">
                            <div class="small-muted mt-1">Lettere separate da virgola.</div>
                        </div>
                        <div class="col-md-4 op-field op-merge">
                            <label class="form-label">Colonna destinazione *</label>
                            <input type="text" class="form-control" name="target_column" id="merge_target" placeholder="es. J">
                        </div>
                        <div class="col-md-8 op-field op-merge">
                            <label class="form-label">Separatore</label>
                            <input type="text" class="form-control" name="separator" id="merge_sep" value=" " placeholder="spazio">
                            <div class="small-muted mt-1">Carattere inserito tra i valori uniti. Default: spazio.</div>
                        </div>
                        <div class="col-md-4 op-field op-merge d-flex align-items-end">
                            <div class="form-check">
                                <input class="form-check-input" type="checkbox" name="skip_empty" id="merge_skip" checked>
                                <label class="form-check-label" for="merge_skip">Ignora valori vuoti</label>
                            </div>
                        </div>

                        <!-- Campi COPY -->
                        <div class="col-md-6 op-field op-copy">
                            <label class="form-label">Colonna sorgente *</label>
                            <input type="text" class="form-control" name="source_column" id="copy_source" placeholder="es. D">
                        </div>
                        <div class="col-md-6 op-field op-copy">
                            <label class="form-label">Colonna destinazione *</label>
                            <input type="text" class="form-control" name="target_column_copy" id="copy_target" placeholder="es. J">
                        </div>

                        <!-- Campi COLONNE (clear/trim/uppercase/lowercase/replace) -->
                        <div class="col-md-12 op-field op-columns">
                            <label class="form-label">Colonne *</label>
                            <input type="text" class="form-control" name="columns" id="columns_input" placeholder="es. D, F">
                            <div class="small-muted mt-1">Una o più lettere separate da virgola.</div>
                        </div>

                        <!-- Campo TRIM chars -->
                        <div class="col-md-12 op-field op-trim">
                            <label class="form-label">Caratteri da rimuovere (opzionale)</label>
                            <input type="text" class="form-control" name="chars" id="trim_chars" placeholder="lascia vuoto per spazi">
                        </div>

                        <!-- Campi REPLACE -->
                        <div class="col-md-6 op-field op-replace">
                            <label class="form-label">Testo da cercare</label>
                            <input type="text" class="form-control" name="search" id="replace_search">
                        </div>
                        <div class="col-md-6 op-field op-replace">
                            <label class="form-label">Testo sostitutivo</label>
                            <input type="text" class="form-control" name="replace" id="replace_replace">
                        </div>
                        <div class="col-md-12 op-field op-replace">
                            <div class="form-check">
                                <input class="form-check-input" type="checkbox" name="regex" id="replace_regex">
                                <label class="form-check-label" for="replace_regex">
                                    Usa espressione regolare (regex) — solo se sai cosa stai facendo
                                </label>
                            </div>
                        </div>
                    </div>
                </div>

                <div class="modal-footer">
                    <button type="button" class="btn btn-light" data-bs-dismiss="modal">Annulla</button>
                    <button type="submit" class="btn btn-primary" id="saveStepButton">Salva step</button>
                </div>
            </form>
        </div>
    </div>

    <!-- Form nascosti -->
    <form method="POST" id="deleteStepForm" style="display:none;">
        <input type="hidden" name="csrf_token" value="<?= htmlspecialchars($csrfToken, ENT_QUOTES, 'UTF-8'); ?>">
        <input type="hidden" name="idroutine" value="<?= (int)$idroutine; ?>">
        <input type="hidden" name="action" value="delete">
        <input type="hidden" name="idstep" id="deleteIdStep" value="">
    </form>

    <form method="POST" id="moveStepForm" style="display:none;">
        <input type="hidden" name="csrf_token" value="<?= htmlspecialchars($csrfToken, ENT_QUOTES, 'UTF-8'); ?>">
        <input type="hidden" name="idroutine" value="<?= (int)$idroutine; ?>">
        <input type="hidden" name="action" value="move">
        <input type="hidden" name="idstep" id="moveIdStep" value="">
        <input type="hidden" name="direction" id="moveDirection" value="">
    </form>

    <?php include('jsinclude.php'); ?>

    <script>
        const stepsData = <?= json_encode($stepsForJs, JSON_UNESCAPED_UNICODE); ?>;

        document.addEventListener('DOMContentLoaded', function() {
            const stepModal = new bootstrap.Modal(document.getElementById('stepModal'));

            const stepFormAction = document.getElementById('stepFormAction');
            const idstep = document.getElementById('idstep');
            const stepModalTitle = document.getElementById('stepModalTitle');
            const saveStepButton = document.getElementById('saveStepButton');
            const operation = document.getElementById('operation');
            const active = document.getElementById('active');

            // Mappa quali gruppi di campi mostrare per ogni operazione.
            const fieldGroups = {
                merge: ['op-merge'],
                copy: ['op-copy'],
                clear: ['op-columns'],
                trim: ['op-columns', 'op-trim'],
                replace: ['op-columns', 'op-replace'],
                uppercase: ['op-columns'],
                lowercase: ['op-columns']
            };

            function showFieldsForOperation(op) {
                // Nasconde tutti i gruppi.
                document.querySelectorAll('.op-field').forEach(function(el) {
                    el.style.display = 'none';
                });
                // Mostra i gruppi dell'operazione scelta.
                (fieldGroups[op] || []).forEach(function(cls) {
                    document.querySelectorAll('.' + cls).forEach(function(el) {
                        el.style.display = '';
                    });
                });
            }

            operation.addEventListener('change', function() {
                showFieldsForOperation(operation.value);
            });

            function resetStepForm() {
                document.getElementById('stepForm').reset();
                // reset non ripristina i checkbox "checked" di default in modo affidabile: li forziamo
                document.getElementById('merge_skip').checked = true;
                document.getElementById('replace_regex').checked = false;
                document.getElementById('merge_sep').value = ' ';
            }

            function openForCreate() {
                stepFormAction.value = 'create';
                idstep.value = '';
                stepModalTitle.textContent = 'Aggiungi step';
                saveStepButton.textContent = 'Aggiungi step';

                resetStepForm();
                operation.value = 'merge';
                active.value = '1';
                showFieldsForOperation('merge');
                stepModal.show();
            }

            function openForEdit(id) {
                const data = stepsData[id];
                if (!data) {
                    return;
                }

                stepFormAction.value = 'update';
                idstep.value = id;
                stepModalTitle.textContent = 'Modifica step';
                saveStepButton.textContent = 'Aggiorna step';

                resetStepForm();
                operation.value = data.operation;
                active.value = String(data.active);

                // Popola i campi in base all'operazione.
                if (data.operation === 'merge') {
                    document.getElementById('merge_source').value = data.source_columns || '';
                    document.getElementById('merge_target').value = data.target_column || '';
                    document.getElementById('merge_sep').value = (data.separator !== undefined ? data.separator : ' ');
                    document.getElementById('merge_skip').checked = !!data.skip_empty;
                } else if (data.operation === 'copy') {
                    document.getElementById('copy_source').value = data.source_column || '';
                    document.getElementById('copy_target').value = data.target_column || '';
                } else if (['clear', 'trim', 'uppercase', 'lowercase'].includes(data.operation)) {
                    document.getElementById('columns_input').value = data.columns || '';
                    if (data.operation === 'trim') {
                        document.getElementById('trim_chars').value = data.chars || '';
                    }
                } else if (data.operation === 'replace') {
                    document.getElementById('columns_input').value = data.columns || '';
                    document.getElementById('replace_search').value = data.search || '';
                    document.getElementById('replace_replace').value = data.replace || '';
                    document.getElementById('replace_regex').checked = !!data.regex;
                }

                showFieldsForOperation(data.operation);
                stepModal.show();
            }

            /*
             * NOTA sul campo destinazione di copy:
             * l'input HTML si chiama target_column_copy per non collidere con merge,
             * ma il backend si aspetta target_column. Rinominiamo al submit.
             */
            document.getElementById('stepForm').addEventListener('submit', function(e) {
                if (operation.value === 'copy') {
                    const copyTarget = document.getElementById('copy_target');
                    // Crea/aggiorna un campo hidden target_column col valore di copy.
                    let hidden = document.getElementById('copy_target_hidden');
                    if (!hidden) {
                        hidden = document.createElement('input');
                        hidden.type = 'hidden';
                        hidden.name = 'target_column';
                        hidden.id = 'copy_target_hidden';
                        this.appendChild(hidden);
                    }
                    hidden.value = copyTarget.value;
                }
            });

            document.getElementById('btnAddStep').addEventListener('click', openForCreate);

            document.querySelectorAll('.btnEditStep').forEach(function(btn) {
                btn.addEventListener('click', function() {
                    openForEdit(btn.dataset.idstep);
                });
            });

            document.querySelectorAll('.btnDeleteStep').forEach(function(btn) {
                btn.addEventListener('click', function() {
                    Swal.fire({
                        title: 'Eliminare lo step?',
                        text: 'Operazione irreversibile.',
                        icon: 'warning',
                        showCancelButton: true,
                        confirmButtonText: 'Sì, elimina',
                        cancelButtonText: 'Annulla',
                        confirmButtonColor: '#d33'
                    }).then(function(result) {
                        if (result.isConfirmed) {
                            document.getElementById('deleteIdStep').value = btn.dataset.idstep;
                            document.getElementById('deleteStepForm').submit();
                        }
                    });
                });
            });

            document.querySelectorAll('.btnMove').forEach(function(btn) {
                btn.addEventListener('click', function() {
                    document.getElementById('moveIdStep').value = btn.dataset.idstep;
                    document.getElementById('moveDirection').value = btn.dataset.direction;
                    document.getElementById('moveStepForm').submit();
                });
            });

            // --- Anteprima routine su XLS caricato (nessun salvataggio) ---
            const previewFile = document.getElementById('previewFile');
            const btnRunPreview = document.getElementById('btnRunPreview');
            const previewStatus = document.getElementById('previewStatus');
            const previewResultWrapper = document.getElementById('previewResultWrapper');
            const previewTableBody = document.querySelector('#previewTable tbody');
            const currentIdRoutine = "<?= (int)$idroutine; ?>";

            btnRunPreview.addEventListener('click', function() {
                if (!previewFile.files || previewFile.files.length === 0) {
                    Swal.fire({
                        icon: 'info',
                        title: 'Nessun file',
                        text: 'Seleziona un file XLS di prova.'
                    });
                    return;
                }

                const formData = new FormData();
                formData.append('idroutine', currentIdRoutine);
                formData.append('file', previewFile.files[0]);

                previewStatus.textContent = 'Elaborazione in corso...';
                previewResultWrapper.style.display = 'none';
                previewTableBody.innerHTML = '';
                btnRunPreview.disabled = true;

                fetch('routine_preview.php', {
                        method: 'POST',
                        body: formData,
                        cache: 'no-store'
                    })
                    .then(function(res) {
                        return res.json();
                    })
                    .then(function(data) {
                        btnRunPreview.disabled = false;

                        if (data.error) {
                            previewStatus.textContent = '';
                            Swal.fire({
                                icon: 'warning',
                                title: 'Anteprima non riuscita',
                                text: data.error
                            });
                            return;
                        }

                        previewStatus.textContent = 'Riga elaborata: riga Excel ' + data.excelrow + '.';

                        const letters = data.letters || [];
                        const headers = data.headers || [];
                        const row = data.row || [];

                        for (let i = 0; i < row.length; i++) {
                            const tr = document.createElement('tr');

                            const tdCol = document.createElement('td');
                            tdCol.innerHTML = '<strong>' + (letters[i] || '') + '</strong>';

                            const tdHead = document.createElement('td');
                            tdHead.className = 'small-muted';
                            tdHead.textContent = headers[i] || '';

                            const tdVal = document.createElement('td');
                            tdVal.textContent = row[i] || '';

                            tr.appendChild(tdCol);
                            tr.appendChild(tdHead);
                            tr.appendChild(tdVal);
                            previewTableBody.appendChild(tr);
                        }

                        previewResultWrapper.style.display = '';
                    })
                    .catch(function(err) {
                        btnRunPreview.disabled = false;
                        previewStatus.textContent = '';
                        Swal.fire({
                            icon: 'error',
                            title: 'Errore',
                            text: 'Impossibile eseguire l\'anteprima.'
                        });
                        console.error(err);
                    });
            });

            <?php if ($flash): ?>
                Swal.fire({
                    icon: '<?= htmlspecialchars($flash['type'], ENT_QUOTES, 'UTF-8'); ?>',
                    title: '<?= $flash['type'] === 'success' ? 'Fatto' : ($flash['type'] === 'warning' ? 'Attenzione' : 'Errore'); ?>',
                    text: '<?= htmlspecialchars($flash['message'], ENT_QUOTES, 'UTF-8'); ?>'
                });
            <?php endif; ?>
        });
    </script>
</body>

</html>