<?php
declare(strict_types=1);

require_once __DIR__ . '/../../../modules/shared/db.php';
require_once __DIR__ . '/shopify-api.php';
require_once __DIR__ . '/service.php';
require_once __DIR__ . '/../bestellungen/shopify-projection.php';

function shopify_delta_argument(string $name, array $argv, ?string $default = null): ?string
{
    $prefix = '--' . $name . '=';
    foreach ($argv as $argument) {
        if (str_starts_with($argument, $prefix)) {
            return substr($argument, strlen($prefix));
        }
    }
    return $default;
}

function shopify_delta_start_run(PDO $pdo, string $cutoff, bool $dryRun): int
{
    $stmt = $pdo->prepare(
        "INSERT INTO process_runs (process_name, status, scope_json, requested_by)
         VALUES ('erp.import-integration.shopify_delta_order_import', 'running', :scope_json::jsonb, 'cli')
         RETURNING id"
    );
    $stmt->execute([':scope_json' => json_encode([
        'cutoff_timestamp' => $cutoff,
        'dry_run' => $dryRun,
    ], JSON_THROW_ON_ERROR)]);
    return (int) $stmt->fetchColumn();
}

function shopify_delta_finish_run(PDO $pdo, int $runId, string $status, array $result, ?Throwable $error = null): void
{
    $stmt = $pdo->prepare(
        'UPDATE process_runs
         SET status = :status, result_json = :result_json::jsonb, finished_at = NOW(),
             error_code = :error_code, error_message = :error_message
         WHERE id = :id'
    );
    $stmt->execute([
        ':status' => $status,
        ':result_json' => json_encode($result, JSON_THROW_ON_ERROR),
        ':error_code' => $error === null ? null : 'shopify_delta_failed',
        ':error_message' => $error?->getMessage(),
        ':id' => $runId,
    ]);
}

function shopify_delta_load_orders(array $env, string $searchQuery): array
{
    $query = <<<'GQL'
query ($query: String!, $after: String) {
  orders(first: 100, after: $after, query: $query, sortKey: CREATED_AT) {
    nodes { id name createdAt cancelledAt displayFinancialStatus displayFulfillmentStatus }
    pageInfo { hasNextPage endCursor }
  }
}
GQL;

    $orders = [];
    $after = null;
    do {
        $data = shopify_graphql_query($env, $query, ['query' => $searchQuery, 'after' => $after]);
        $connection = $data['orders'] ?? [];
        foreach (($connection['nodes'] ?? []) as $order) {
            $orders[] = $order;
        }
        $after = ($connection['pageInfo']['hasNextPage'] ?? false) ? ($connection['pageInfo']['endCursor'] ?? null) : null;
    } while ($after !== null);

    return $orders;
}

function shopify_delta_load_order(array $env, string $orderGid): array
{
    $query = <<<'GQL'
query ($id: ID!) {
  order(id: $id) {
    id name createdAt updatedAt cancelledAt displayFinancialStatus displayFulfillmentStatus
    currentSubtotalPriceSet { shopMoney { amount currencyCode } }
    totalShippingPriceSet { shopMoney { amount currencyCode } }
    totalTaxSet { shopMoney { amount currencyCode } }
    totalPriceSet { shopMoney { amount currencyCode } }
    customer { id firstName lastName email phone }
    billingAddress { firstName lastName company address1 address2 zip city provinceCode country countryCodeV2 phone }
    shippingAddress { firstName lastName company address1 address2 zip city provinceCode country countryCodeV2 phone }
    lineItems(first: 50) {
      nodes { id sku name quantity originalUnitPriceSet { shopMoney { amount currencyCode } } variant { id sku product { id } } }
    }
  }
}
GQL;
    $data = shopify_graphql_query($env, $query, ['id' => $orderGid]);
    $order = $data['order'] ?? null;
    if (!is_array($order)) {
        throw new RuntimeException("Shopify-Bestellung nicht gefunden: {$orderGid}");
    }
    return $order;
}

function run_shopify_delta(array $env, PDO $pdo, string $cutoff, bool $dryRun): array
{
    $cutoffDate = new DateTimeImmutable($cutoff);
    $searchQuery = 'created_at:>' . $cutoffDate->format('Y-m-d');
    $counters = [
        'status' => 'done',
        'cutoff_timestamp' => $cutoffDate->format(DATE_ATOM),
        'dry_run' => $dryRun,
        'checked_orders' => 0,
        'skipped_cancelled_or_refunded' => 0,
        'already_imported' => 0,
        'handed_off' => 0,
        'clarification_order_gids' => [],
    ];

    foreach (shopify_delta_load_orders($env, $searchQuery) as $summaryOrder) {
        $createdAt = new DateTimeImmutable((string) ($summaryOrder['createdAt'] ?? ''));
        if ($createdAt <= $cutoffDate) {
            continue;
        }
        $counters['checked_orders']++;
        if (($summaryOrder['cancelledAt'] ?? null) !== null || strtoupper((string) ($summaryOrder['displayFinancialStatus'] ?? '')) === 'REFUNDED') {
            $counters['skipped_cancelled_or_refunded']++;
            continue;
        }

        try {
            $orderGid = (string) $summaryOrder['id'];
            $result = project_shopify_order(
                $pdo,
                $orderGid,
                static fn (string $gid): array => shopify_delta_load_order($env, $gid),
                $dryRun
            );
            if (!$dryRun && ($result['status'] ?? '') === 'imported') {
                $labelPayload = build_legacy_label_order_payload($pdo, (int) $result['sales_order_id']);
                $labelResult = trigger_shipping_label_flow($labelPayload, $env);
                $excelResult = trigger_excel_webhook((string) ($summaryOrder['name'] ?? $orderGid), $env);
                $result['label_trigger'] = $labelResult;
                $result['excel_trigger'] = $excelResult;
                if (!$labelResult['ok'] || !$excelResult['ok']) {
                    throw new RuntimeException('Mindestens ein n8n-Webhook ist fehlgeschlagen');
                }
            }
            if (($result['status'] ?? '') === 'already_imported') {
                $counters['already_imported']++;
            } else {
                $counters['handed_off']++;
            }
        } catch (Throwable $error) {
            $counters['status'] = 'partial_success';
            $counters['clarification_order_gids'][] = (string) $summaryOrder['id'];
        }
    }

    return $counters;
}

if (PHP_SAPI === 'cli' && realpath($_SERVER['SCRIPT_FILENAME'] ?? '') === __FILE__) {
    $argv = $_SERVER['argv'] ?? [];
    $cutoff = shopify_delta_argument('cutoff', $argv);
    $execute = in_array('--execute', $argv, true);
    $dryRun = !$execute;
    if ($cutoff === null || $cutoff === '') {
        fwrite(STDERR, "Usage: php shopify-delta-run.php --cutoff=ISO-8601 [--execute]\n");
        exit(2);
    }

    $env = expand_env_values(parse_env_file(__DIR__ . '/../../../.env'));
    $pdo = connect_database($env);
    $runId = shopify_delta_start_run($pdo, $cutoff, $dryRun);
    try {
        $result = run_shopify_delta($env, $pdo, $cutoff, $dryRun);
        $result['technical_run_id'] = $runId;
        shopify_delta_finish_run($pdo, $runId, $result['status'], $result);
        echo json_encode($result, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) . PHP_EOL;
        exit($result['status'] === 'done' ? 0 : 1);
    } catch (Throwable $error) {
        shopify_delta_finish_run($pdo, $runId, 'failed', ['status' => 'failed', 'technical_run_id' => $runId], $error);
        fwrite(STDERR, $error->getMessage() . PHP_EOL);
        exit(1);
    }
}