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

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

$response = ['success' => false, 'message' => ''];

try {
    if ($_SERVER['REQUEST_METHOD'] !== 'POST' || !isset($_POST['iddatadb'])) {
        throw new Exception('Richiesta non valida');
    }

    $iddatadb = intval($_POST['iddatadb']);
    $db = DBHandlerSelect::getInstance();
    $pdo = $db->getConnection();

    $data = $_POST;
    $details = [];

    // 1. POST-დან ამოვიღოთ მხოლოდ details
    foreach ($data as $key => $value) {
        if (preg_match('/^details(\d+)field_value$/', $key, $matches)) {
            $id = $matches[1];
            $details[$id] = $value;
        }
    }

    // 2. DB-დან წამოვიღოთ არსებული მნიშვნელობები
    $stmt = $pdo->prepare("SELECT mapping_id, field_value FROM import_data_details WHERE id = ?");
    $stmt->execute([$iddatadb]);

    $currentValues = [];
    while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
        $currentValues[$row['mapping_id']] = $row['field_value'];
    }

    // 3. შევადაროთ POST-ს და DB-ს
    $changed = [];
    foreach ($details as $id => $newValue) {
        $oldValue = $currentValues[$id] ?? null;
        if ($oldValue !== $newValue) {
            $changed[$id] = [
                'old' => $oldValue,
                'new' => $newValue
            ];
        }
    }

    // 4. თუ არის ცვლილებები → UPDATE
    if (!empty($changed)) {
        $updateStmt = $pdo->prepare("
            UPDATE import_data_details
            SET field_value = :newValue
            WHERE id = :iddatadb AND mapping_id = :mappingId
        ");

        foreach ($changed as $mappingId => $values) {
            $updateStmt->execute([
                ':newValue'   => $values['new'],
                ':iddatadb'   => $iddatadb,
                ':mappingId'  => $mappingId
            ]);
        }

        $response['success'] = true;
        $response['message'] = "Updated successfully";
        $response['changed'] = $changed; // Debug / optional
    } else {
        $response['success'] = true;
        $response['message'] = "No changes found";
    }

} catch (Exception $e) {
    $response['success'] = false;
    $response['message'] = $e->getMessage();
    error_log("Errore in save_edited_row.php: " . $e->getMessage());
}

echo json_encode($response);
exit;