<?php

require_once dirname(__DIR__, 2) . '/vendor/autoload.php';
require_once __DIR__ . '/class/db-functions.php';
require_once __DIR__ . '/class/binding-functions.php';
include dirname(__DIR__) . '/../extra/auth.php';

header('Content-Type: application/json');
ini_set('display_errors', '0');
error_reporting(E_ALL);

if (!Auth::check()) {
    http_response_code(401);
    echo json_encode(['success' => false, 'error' => 'Unauthorized']);
    exit;
}

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    http_response_code(405);
    echo json_encode(['success' => false, 'error' => 'Method not allowed']);
    exit;
}

$kind        = ($_POST['kind'] ?? 'custom') === 'fixed' ? 'fixed' : 'custom';
$templateId  = intval($_POST['template_id'] ?? 0);
$mappingId   = intval($_POST['mapping_id'] ?? 0);
$fieldId     = intval($_POST['field_id'] ?? 0);
$sourceValue = (string) ($_POST['source_value'] ?? '');
$limsValueId = intval($_POST['lims_value_id'] ?? 0);
$limsValue   = (string) ($_POST['lims_value'] ?? '');

$datadbIds = [];
if (isset($_POST['datadb_ids'])) {
    $decoded = json_decode($_POST['datadb_ids'], true);
    if (is_array($decoded)) {
        $datadbIds = $decoded;
    }
}

if ($templateId <= 0 || $mappingId <= 0 || trim($sourceValue) === '' || $limsValueId <= 0) {
    http_response_code(422);
    echo json_encode(['success' => false, 'error' => 'Missing required parameters']);
    exit;
}

try {
    $pdo = DBHandlerSelect::getInstance()->getConnection();
    $createdBy = Auth::user() ? (int) Auth::user()->present()->id : null;

    if ($kind === 'fixed') {
        $stmt = $pdo->prepare("SELECT fixed_field_key FROM template_fixed_mapping WHERE id = ?");
        $stmt->execute([$mappingId]);
        $fixedKey = (string) ($stmt->fetchColumn() ?: '');

        if ($fixedKey === '' || !binding_fixed_is_list($fixedKey)) {
            http_response_code(422);
            echo json_encode(['success' => false, 'error' => 'Invalid fixed field']);
            exit;
        }

        binding_upsert($pdo, $templateId, $mappingId, 0, $sourceValue, $limsValueId, $limsValue, $createdBy, 'fixed');

        $applied = !empty($datadbIds)
            ? binding_apply_to_datadb($pdo, $fixedKey, (string) $limsValueId, $datadbIds)
            : 0;

        echo json_encode([
            'success'       => true,
            'applied_rows'  => $applied,
            'kind'          => 'fixed',
            'source_value'  => $sourceValue,
            'lims_value'    => $limsValue,
            'lims_value_id' => $limsValueId,
        ]);
        exit;
    }

    if ($fieldId <= 0) {
        $stmt = $pdo->prepare("SELECT field_id FROM template_mapping WHERE id = ?");
        $stmt->execute([$mappingId]);
        $fieldId = (int) ($stmt->fetchColumn() ?: 0);
    }

    binding_upsert($pdo, $templateId, $mappingId, $fieldId, $sourceValue, $limsValueId, $limsValue, $createdBy);

    $applied = !empty($datadbIds)
        ? binding_apply_to_details($pdo, $mappingId, (string) $limsValueId, $datadbIds)
        : 0;

    echo json_encode([
        'success'       => true,
        'applied_rows'  => $applied,
        'kind'          => 'custom',
        'source_value'  => $sourceValue,
        'lims_value'    => $limsValue,
        'lims_value_id' => $limsValueId,
    ]);
} catch (Exception $e) {
    http_response_code(500);
    echo json_encode(['success' => false, 'error' => $e->getMessage()]);
}