<?php
include('include/headscript.php');
require_once(__DIR__ . '/class/binding-functions.php');

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

// Filtri comuni.
$templateFilter = isset($_GET['template_id']) ? intval($_GET['template_id']) : 0;
$search         = trim($_GET['q'] ?? '');
$perPage        = 50;
$page           = max(1, intval($_GET['page'] ?? 1));
$dir            = (strtolower($_GET['dir'] ?? 'asc') === 'desc') ? 'DESC' : 'ASC';

// Modalita': overview (gruppi per campo) oppure detail (valori di un campo).
$focusTarget = trim($_GET['target'] ?? '');
$mode = $focusTarget !== '' ? 'detail' : 'overview';

$templates = $pdo->query("SELECT id, name FROM excel_templates ORDER BY name")->fetchAll(PDO::FETCH_ASSOC);

// Helper: URL che preserva i filtri correnti.
$bmUrl = function (array $ov) use ($templateFilter, $search, $dir, $page, $focusTarget) {
    $base = [
        'template_id' => $templateFilter ?: null,
        'q'           => $search !== '' ? $search : null,
        'order'       => $_GET['order'] ?? null,
        'dir'         => strtolower($dir),
        'page'        => $page,
        'target'      => $focusTarget !== '' ? $focusTarget : null,
    ];
    $p = array_filter(array_merge($base, $ov), fn($v) => $v !== null && $v !== '');
    return 'bindings_manage.php?' . http_build_query($p);
};

// Filtri WHERE comuni (template/kind/search).
$conds = [];
$params = [];
if ($templateFilter > 0) {
    $conds[] = 'b.template_id = ?';
    $params[] = $templateFilter;
}

if ($mode === 'detail') {
    // ---- DETAIL: valori (json_value -> lims) di un singolo campo (target_key) ----
    $conds[] = 'b.target_key = ?';
    $params[] = $focusTarget;
    if ($search !== '') {
        $conds[] = '(b.json_value LIKE ? OR b.lims_value LIKE ?)';
        $like = '%' . $search . '%';
        array_push($params, $like, $like);
    }
    $where = 'WHERE ' . implode(' AND ', $conds);

    $orderCols = ['json' => 'b.json_value', 'lims' => 'b.lims_value'];
    $order = array_key_exists($_GET['order'] ?? '', $orderCols) ? $_GET['order'] : 'json';
    $orderSql = $orderCols[$order] . ' ' . $dir;

    $countStmt = $pdo->prepare("SELECT COUNT(*) FROM json_lims_binding b $where");
    $countStmt->execute($params);
    $total = (int) $countStmt->fetchColumn();
    $totalPages = max(1, (int) ceil($total / $perPage));
    if ($page > $totalPages) $page = $totalPages;
    $offset = ($page - 1) * $perPage;

    $sql = "SELECT b.id, b.template_id, b.binding_kind, b.mapping_id, b.fixed_field_key, b.field_id,
                   b.json_value, b.lims_value_id, b.lims_value,
                   t.name AS template_name, m.field_label
            FROM json_lims_binding b
            LEFT JOIN excel_templates t ON t.id = b.template_id
            LEFT JOIN template_mapping m ON m.id = b.mapping_id
            $where
            ORDER BY $orderSql, b.json_value ASC
            LIMIT $perPage OFFSET $offset";
    $stmt = $pdo->prepare($sql);
    $stmt->execute($params);
    $rows = $stmt->fetchAll(PDO::FETCH_ASSOC);

    // Intestazione del gruppo (tutte le righe condividono campo/template/kind).
    $head = $rows[0] ?? null;
    if (!$head) {
        // Target vuoto (es. dopo aver svuotato il campo): ricavo i meta dal target_key.
        $head = ['binding_kind' => str_starts_with($focusTarget, 'fx:') ? 'fixed' : 'custom'];
    }
    $headKind = $head['binding_kind'] ?? 'custom';
    if ($headKind === 'fixed') {
        $headFixedKey = $head['fixed_field_key'] ?? (explode(':', $focusTarget)[2] ?? '');
        $headLabel = binding_fixed_label((string) $headFixedKey);
        $headTpl = (int) ($head['template_id'] ?? (explode(':', $focusTarget)[1] ?? 0));
    } else {
        $headLabel = $head['field_label'] ?? ('mapping ' . ($head['mapping_id'] ?? ''));
        $headTpl = (int) ($head['template_id'] ?? 0);
    }
    $headTplName = $headTpl ? ($pdo->query("SELECT name FROM excel_templates WHERE id=" . $headTpl)->fetchColumn() ?: ('#' . $headTpl)) : '';
} else {
    // ---- OVERVIEW: un gruppo per campo (target_key) con il conteggio ----
    if ($search !== '') {
        $conds[] = '(t.name LIKE ? OR m.field_label LIKE ? OR b.fixed_field_key LIKE ?)';
        $like = '%' . $search . '%';
        array_push($params, $like, $like, $like);
    }
    $where = $conds ? ('WHERE ' . implode(' AND ', $conds)) : '';

    $orderCols = ['template' => 'template_name', 'field' => 'field_label', 'count' => 'cnt'];
    $order = array_key_exists($_GET['order'] ?? '', $orderCols) ? $_GET['order'] : 'template';
    $orderSql = $orderCols[$order] . ' ' . $dir;

    $countStmt = $pdo->prepare("SELECT COUNT(DISTINCT b.target_key)
        FROM json_lims_binding b
        LEFT JOIN excel_templates t ON t.id = b.template_id
        LEFT JOIN template_mapping m ON m.id = b.mapping_id $where");
    $countStmt->execute($params);
    $total = (int) $countStmt->fetchColumn();
    $totalPages = max(1, (int) ceil($total / $perPage));
    if ($page > $totalPages) $page = $totalPages;
    $offset = ($page - 1) * $perPage;

    $sql = "SELECT b.target_key, b.template_id, b.binding_kind, b.mapping_id, b.fixed_field_key,
                   MAX(t.name) AS template_name, MAX(m.field_label) AS field_label,
                   COUNT(*) AS cnt, MAX(b.updated_at) AS last_updated
            FROM json_lims_binding b
            LEFT JOIN excel_templates t ON t.id = b.template_id
            LEFT JOIN template_mapping m ON m.id = b.mapping_id
            $where
            GROUP BY b.target_key, b.template_id, b.binding_kind, b.mapping_id, b.fixed_field_key
            ORDER BY $orderSql, template_name ASC
            LIMIT $perPage OFFSET $offset";
    $stmt = $pdo->prepare($sql);
    $stmt->execute($params);
    $groups = $stmt->fetchAll(PDO::FETCH_ASSOC);
}

$sortLink = function (string $col, string $label) use ($bmUrl, $order, $dir) {
    $nextDir = ($order === $col && $dir === 'ASC') ? 'desc' : 'asc';
    $caret = $order === $col ? ($dir === 'ASC' ? ' &#9650;' : ' &#9660;') : '';
    return '<a href="' . htmlspecialchars($bmUrl(['order' => $col, 'dir' => $nextDir, 'page' => 1]))
        . '" class="text-decoration-none text-reset">' . $label . $caret . '</a>';
};
?>
<!doctype html>
<html lang="en">

<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'); ?>
    <link href="https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/css/select2.min.css" rel="stylesheet">
    <style>
        .json-value {
            font-family: Consolas, Monaco, monospace;
            font-weight: 600;
        }

        td .select2-container {
            min-width: 220px;
        }

        .row-status {
            font-size: 12px;
        }

        .group-row {
            cursor: pointer;
        }

        .group-row:hover {
            background-color: #f1f5ff;
        }
    </style>
    <title>Gestione Binding JSON &rarr; LIMS - <?= htmlspecialchars($titlewebsite ?? '', ENT_QUOTES, 'UTF-8'); ?></title>
</head>

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

                <div class="card radius-10">
                    <div class="card-header">
                        <div class="d-flex align-items-center justify-content-between flex-wrap gap-2">
                            <h6 class="mb-0">Gestione Binding JSON &rarr; LIMS</h6>
                            <form method="GET" class="d-flex align-items-center gap-2 flex-wrap mb-0">
                                <?php if ($mode === 'detail'): ?>
                                    <input type="hidden" name="target" value="<?= htmlspecialchars($focusTarget) ?>">
                                <?php endif; ?>
                                <input type="hidden" name="dir" value="<?= htmlspecialchars(strtolower($dir)) ?>">
                                <input type="text" name="q" class="form-control form-control-sm" style="width:220px;"
                                    placeholder="<?= $mode === 'detail' ? 'Cerca valore...' : 'Cerca campo/template...' ?>"
                                    value="<?= htmlspecialchars($search) ?>">
                                <?php if ($mode === 'overview'): ?>
                                    <select name="template_id" class="form-select form-select-sm" style="width:auto;" onchange="this.form.submit()">
                                        <option value="0">Tutti i template</option>
                                        <?php foreach ($templates as $t): ?>
                                            <option value="<?= (int) $t['id'] ?>" <?= $templateFilter === (int) $t['id'] ? 'selected' : '' ?>>
                                                <?= htmlspecialchars($t['name']) ?>
                                            </option>
                                        <?php endforeach; ?>
                                    </select>
                                <?php endif; ?>
                                <button type="submit" class="btn btn-sm btn-primary">Cerca</button>
                            </form>
                        </div>
                    </div>

                    <div class="card-body">
                        <div id="globalError" class="alert alert-danger" style="display:none;"></div>

                        <?php if ($mode === 'detail'): ?>
                            <div class="d-flex justify-content-between align-items-center mb-2 flex-wrap gap-2">
                                <div>
                                    <a href="<?= htmlspecialchars($bmUrl(['target' => null, 'page' => 1, 'order' => null])) ?>" class="btn btn-sm btn-outline-secondary">
                                        <i class="fas fa-arrow-left"></i> Tutti i campi
                                    </a>
                                    <span class="ms-2">
                                        <strong><?= htmlspecialchars($headLabel) ?></strong>
                                        <?php if ($headKind === 'fixed'): ?><span class="badge bg-light text-dark border">fixed</span><?php endif; ?>
                                        <span class="text-muted">&middot; <?= htmlspecialchars((string) $headTplName) ?></span>
                                    </span>
                                </div>
                                <span class="small text-muted"><?= $total ?> valore/i &middot; pagina <?= $page ?>/<?= $totalPages ?></span>
                            </div>

                            <div class="table-responsive">
                                <table class="table table-striped table-bordered align-middle" id="bindingsTable">
                                    <thead>
                                        <tr>
                                            <th><?= $sortLink('json', 'Valore JSON') ?></th>
                                            <th><?= $sortLink('lims', 'Valore LIMS') ?></th>
                                            <th style="width:170px;">Azioni</th>
                                        </tr>
                                    </thead>
                                    <tbody>
                                        <?php if (empty($rows)): ?>
                                            <tr class="no-data-row">
                                                <td colspan="3" class="text-center text-muted">Nessun valore per questo campo.</td>
                                            </tr>
                                        <?php else: ?>
                                            <?php foreach ($rows as $b): ?>
                                                <?php $bDangling = ($b['binding_kind'] === 'custom' && $b['field_label'] === null); ?>
                                                <tr data-id="<?= (int) $b['id'] ?>"
                                                    data-kind="<?= $b['binding_kind'] ?>"
                                                    data-mapping-id="<?= (int) $b['mapping_id'] ?>"
                                                    data-field-id="<?= (int) $b['field_id'] ?>"
                                                    data-fixed-key="<?= htmlspecialchars((string) $b['fixed_field_key'], ENT_QUOTES) ?>"
                                                    data-template-id="<?= (int) $b['template_id'] ?>"
                                                    data-json-value="<?= htmlspecialchars($b['json_value'], ENT_QUOTES) ?>">
                                                    <td class="json-value"><?= htmlspecialchars($b['json_value']) ?></td>
                                                    <td>
                                                        <select class="form-select binding-select" <?= $bDangling ? 'disabled' : '' ?>>
                                                            <?php if ($b['lims_value_id']): ?>
                                                                <option value="<?= (int) $b['lims_value_id'] ?>" selected><?= htmlspecialchars($b['lims_value']) ?></option>
                                                            <?php endif; ?>
                                                        </select>
                                                        <span class="row-status text-muted"></span>
                                                    </td>
                                                    <td>
                                                        <button type="button" class="btn btn-sm btn-success save-binding-btn" disabled>
                                                            <i class="fas fa-save"></i> Salva
                                                        </button>
                                                        <button type="button" class="btn btn-sm btn-outline-danger delete-binding-btn">
                                                            <i class="fas fa-trash"></i>
                                                        </button>
                                                    </td>
                                                </tr>
                                            <?php endforeach; ?>
                                        <?php endif; ?>
                                    </tbody>
                                </table>
                            </div>

                        <?php else: ?>
                            <div class="alert alert-secondary small">
                                Scegli un campo per gestirne i valori. Le modifiche valgono per le <strong>importazioni future</strong>.
                            </div>
                            <div class="small text-muted mb-2"><?= $total ?> camp<?= $total === 1 ? 'o' : 'i' ?> con binding &middot; pagina <?= $page ?>/<?= $totalPages ?></div>

                            <div class="table-responsive">
                                <table class="table table-striped table-bordered align-middle">
                                    <thead>
                                        <tr>
                                            <th><?= $sortLink('template', 'Template') ?></th>
                                            <th><?= $sortLink('field', 'Campo') ?></th>
                                            <th style="width:120px;"><?= $sortLink('count', '# Binding') ?></th>
                                            <th style="width:90px;"></th>
                                        </tr>
                                    </thead>
                                    <tbody>
                                        <?php if (empty($groups)): ?>
                                            <tr>
                                                <td colspan="4" class="text-center text-muted">Nessun binding presente.</td>
                                            </tr>
                                        <?php else: ?>
                                            <?php foreach ($groups as $g): ?>
                                                <?php
                                                $gKind = $g['binding_kind'];
                                                $gDangling = ($gKind === 'custom' && $g['field_label'] === null);
                                                $gLabel = $gKind === 'fixed'
                                                    ? binding_fixed_label((string) $g['fixed_field_key'])
                                                    : ($g['field_label'] ?? ('mapping ' . $g['mapping_id']));
                                                $gUrl = $bmUrl(['target' => $g['target_key'], 'page' => 1, 'order' => null, 'q' => null]);
                                                ?>
                                                <tr class="group-row" onclick="window.location.href='<?= htmlspecialchars($gUrl) ?>'">
                                                    <td><?= htmlspecialchars($g['template_name'] ?? ('#' . $g['template_id'])) ?></td>
                                                    <td>
                                                        <?= htmlspecialchars($gLabel) ?>
                                                        <?php if ($gKind === 'fixed'): ?><span class="badge bg-light text-dark border">fixed</span><?php endif; ?>
                                                        <?php if ($gDangling): ?><span class="badge bg-warning text-dark" title="Il campo mappato non esiste piu'">campo rimosso</span><?php endif; ?>
                                                    </td>
                                                    <td><span class="badge bg-primary"><?= (int) $g['cnt'] ?></span></td>
                                                    <td><a href="<?= htmlspecialchars($gUrl) ?>" class="btn btn-sm btn-outline-primary">Apri</a></td>
                                                </tr>
                                            <?php endforeach; ?>
                                        <?php endif; ?>
                                    </tbody>
                                </table>
                            </div>
                        <?php endif; ?>

                        <?php if ($totalPages > 1): ?>
                            <nav class="d-flex justify-content-center mt-2">
                                <ul class="pagination pagination-sm mb-0">
                                    <li class="page-item <?= $page <= 1 ? 'disabled' : '' ?>">
                                        <a class="page-link" href="<?= htmlspecialchars($bmUrl(['page' => max(1, $page - 1)])) ?>">&laquo;</a>
                                    </li>
                                    <li class="page-item disabled"><span class="page-link"><?= $page ?> / <?= $totalPages ?></span></li>
                                    <li class="page-item <?= $page >= $totalPages ? 'disabled' : '' ?>">
                                        <a class="page-link" href="<?= htmlspecialchars($bmUrl(['page' => min($totalPages, $page + 1)])) ?>">&raquo;</a>
                                    </li>
                                </ul>
                            </nav>
                        <?php endif; ?>
                    </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>

    <?php include('jsinclude.php'); ?>
    <script src="https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/js/select2.min.js"></script>

    <script>
        $(function() {
            const $globalError = $('#globalError');

            // Select2 solo nelle righe valore della pagina corrente (max 50), saltando le disabilitate.
            $('.binding-select').not(':disabled').each(function() {
                const $row = $(this).closest('tr');
                const isFixed = $row.data('kind') === 'fixed';
                const initialVal = $(this).val();

                $(this).select2({
                    width: '220px',
                    ajax: {
                        url: isFixed ? 'search_fixed_field_values.php' : 'search_customfield_values.php',
                        dataType: 'json',
                        delay: 200,
                        data: params => isFixed ? {
                            field_key: $row.data('fixed-key'),
                            template_id: $row.data('template-id'),
                            q: params.term || '',
                            limit: 50
                        } : {
                            field_id: $row.data('field-id'),
                            q: params.term || '',
                            limit: 50
                        },
                        processResults: data => ({
                            results: data.results || []
                        })
                    },
                    minimumInputLength: 0
                });

                $(this).data('original-val', initialVal);
            });

            $('.binding-select').on('change', function() {
                const $row = $(this).closest('tr');
                const changed = String($(this).val()) !== String($(this).data('original-val'));
                $row.find('.save-binding-btn').prop('disabled', !changed);
            });

            $('.save-binding-btn').on('click', function() {
                const $row = $(this).closest('tr');
                const $select = $row.find('.binding-select');
                const selectedData = $select.select2('data')[0] || {};
                const $status = $row.find('.row-status');
                const $btn = $(this);

                $globalError.hide();
                $btn.prop('disabled', true);
                $status.text('Salvataggio...').removeClass('text-success text-danger').addClass('text-muted');

                const isFixed = $row.data('kind') === 'fixed';
                const targetFields = isFixed
                    ? { kind: 'fixed', fixed_field_key: $row.data('fixed-key') }
                    : { kind: 'custom', mapping_id: $row.data('mapping-id'), field_id: $row.data('field-id') };

                $.post('save_binding.php', {
                    ...targetFields,
                    template_id: $row.data('template-id'),
                    json_value: String($row.data('json-value')),
                    lims_value_id: $select.val(),
                    lims_value: selectedData.text || ''
                }).then(resp => {
                    if (resp && resp.success) {
                        $status.text('Salvato').removeClass('text-muted').addClass('text-success');
                        $select.data('original-val', $select.val());
                    } else {
                        throw new Error((resp && resp.error) || 'Errore salvataggio');
                    }
                }).catch(err => {
                    $status.text('Errore').removeClass('text-muted').addClass('text-danger');
                    $globalError.text(err.message || 'Errore durante il salvataggio.').show();
                    $btn.prop('disabled', false);
                });
            });

            $('.delete-binding-btn').on('click', function() {
                if (!confirm('Eliminare questo binding?')) return;
                const $row = $(this).closest('tr');
                const $btn = $(this);
                $globalError.hide();
                $btn.prop('disabled', true);

                $.post('delete_binding.php', {
                    id: $row.data('id')
                }).then(resp => {
                    if (resp && resp.success) {
                        $row.fadeOut(200, () => $row.remove());
                    } else {
                        throw new Error((resp && resp.error) || 'Errore eliminazione');
                    }
                }).catch(err => {
                    $globalError.text(err.message || 'Errore durante l\'eliminazione.').show();
                    $btn.prop('disabled', false);
                });
            });
        });
    </script>
</body>

</html>