<?php
require_once 'include/headscript.php';

header('Content-Type: application/json');

$data = json_decode(file_get_contents('php://input'), true);

$template_id = isset($data['template_id']) ? (int)$data['template_id'] : 0;
$mapping_id  = isset($data['mapping_id']) ? (int)$data['mapping_id'] : 0;
$value       = isset($data['value']) ? (int)$data['value'] : null;

// Validate input
if ($template_id <= 0 || $mapping_id <= 0 || $value === null) {
    echo json_encode(['success' => false, 'message' => 'Invalid input']);
    exit;
}

// Normalize to 0/1
$value = ($value === 1) ? 1 : 0;

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

try {
    $pdo->beginTransaction();

    if ($value === 1) {
        // 1) Force ONLY ONE row visible_parts per template:
        // set all to 0 for this template
        $stmtReset = $pdo->prepare("
            UPDATE template_mapping
            SET is_visible_parts = 0
            WHERE template_id = ?
        ");
        $stmtReset->execute([$template_id]);
    }

    // 2) Set requested mapping to 1 or 0
    $stmtSet = $pdo->prepare("
        UPDATE template_mapping
        SET is_visible_parts = ?
        WHERE id = ? AND template_id = ?
    ");
    $stmtSet->execute([$value, $mapping_id, $template_id]);

    $pdo->commit();

    echo json_encode([
        'success' => true,
        'template_id' => $template_id,
        'mapping_id' => $mapping_id,
        'value' => $value
    ]);
} catch (Exception $e) {
    if ($pdo->inTransaction()) $pdo->rollBack();
    echo json_encode(['success' => false, 'message' => $e->getMessage()]);
}