<?php
header('Content-Type: application/json');
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

require_once(__DIR__ . '/class/db-functions.php');

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

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

if (!$data || !isset($data['id'])) {
    echo json_encode(["success" => false, "message" => "Invalid or missing ID"]);
    exit;
}

$mappingId = $data['id'];
$mappingType = $data['mapping_type'] ?? '';
$excelColumn = $data['excel_column'] ?? null;
$manualDefault = $data['manual_default'] ?? null;

$autoValue = $data['auto_value'] ?? 'none';
$tablename = $data['tablename'] ?? '';

try {
    // Normalize mapping type
    $allowedTypes = ['', 'xls', 'manual', 'auto'];
    if (!in_array($mappingType, $allowedTypes, true)) {
        echo json_encode(["success" => false, "message" => "Invalid mapping_type"]);
        exit;
    }

    // Normalize auto_value
    $allowedAuto = ['none', 'import_date', 'import_time', 'export_date', 'export_time'];
    if (!in_array($autoValue, $allowedAuto, true)) {
        $autoValue = 'none';
    }

    // Decide what to persist based on mapping_type
    $isManual = 0;
    $excelToSave = null;
    $manualToSave = null;
    $autoToSave = 'none';

    if ($mappingType === 'xls') {
        $isManual = 0;
        $excelToSave = $excelColumn ?: null;
        $manualToSave = null;
        $autoToSave = 'none';
    } elseif ($mappingType === 'manual') {
        $isManual = 1;
        $excelToSave = null;
        $manualToSave = $manualDefault;
        $autoToSave = 'none';
    } elseif ($mappingType === 'auto') {
        $isManual = 0;
        $excelToSave = null;
        $manualToSave = null;
        $autoToSave = $autoValue ?: 'none';
    } else {
        // reset
        $isManual = 0;
        $excelToSave = null;
        $manualToSave = null;
        $autoToSave = 'none';
    }

    $stmt = $pdo->prepare("
    UPDATE template_mapping
    SET
        is_manual = ?,
        excel_column = ?,
        manual_default = ?,
        auto_value = ?
    WHERE id = ?
");

    $result = $stmt->execute([$isManual, $excelToSave, $manualToSave, $autoToSave, $mappingId]);

    if (!$result) {
        echo json_encode(["success" => false, "message" => "Database update failed"]);
        exit;
    }

    echo json_encode([
        "success" => true,
        "message" => "Mapping updated successfully",
        "saved" => [
            "id" => (int)$mappingId,
            "mapping_type" => $mappingType,
            "is_manual" => $isManual,
            "excel_column" => $excelToSave,
            "manual_default" => $manualToSave,
            "auto_value" => $autoToSave
        ]
    ]);
} catch (Exception $e) {
    echo json_encode(["success" => false, "message" => "Error: " . $e->getMessage()]);
}
exit;