<?php

namespace Modules\EcommerceFinance\View;

use App\Http\Controllers\Business\PayablesFinalActions;
use Illuminate\Pagination\LengthAwarePaginator;
use Modules\EcommerceFinance\Services\PayablesFinalRegistry;
use Modules\EcommerceFinance\Services\SupplierPayableOverrideStore;

/**
 * 供应商负数预警：直接读取「供应商应付（终版）→ 供应商应付表」，
 * 仅保留「供应商余额 - 应付余额 + 预估金额 < 0」的记录。
 */
class SupplierNegativeAlertPageData
{
    private const DATASET = 'supplier-payables-report';

    private const PER_PAGE = 25;

    public function __construct(
        private readonly SupplierPayableOverrideStore $store,
        private readonly PayablesFinalRegistry $registry,
    ) {
    }

    /** @return array<string,mixed> */
    public function page(): array
    {
        $rows = $this->store->listRows(
            PayablesFinalActions::DATASET_PREFIX . 'supplier:' . self::DATASET,
            (int) (company_id() ?: 1),
        );

        $negativeRows = [];
        foreach ($rows as $row) {
            $balance = $this->number($row['supplier_balance'] ?? null) ?? 0.0;
            $shouldPay = $this->number($row['should_pay'] ?? null) ?? 0.0;
            $estimatedPrice = $this->number($row['estimated_price'] ?? null) ?? 0.0;
            $alertAmount = $balance - $shouldPay + $estimatedPrice;
            if ($alertAmount >= 0) {
                continue;
            }

            $row['supplier_balance'] = $balance;
            $row['_negative_alert_amount'] = round($alertAmount, 2);
            $negativeRows[] = $row;
        }

        usort($negativeRows, static function (array $left, array $right): int {
            return strcmp(
                (string) ($right['summary_month'] ?? ''),
                (string) ($left['summary_month'] ?? ''),
            ) ?: strnatcasecmp(
                (string) ($left['supplier'] ?? ''),
                (string) ($right['supplier'] ?? ''),
            );
        });

        $months = [];
        foreach ($negativeRows as $row) {
            $month = trim((string) ($row['summary_month'] ?? ''));
            if (preg_match('/^\d{4}-\d{2}$/', $month) === 1) {
                $months[$month] = true;
            }
        }
        $months = array_keys($months);
        rsort($months);

        $requestedMonth = trim((string) request()->query('month', ''));
        $month = in_array($requestedMonth, $months, true) ? $requestedMonth : '';
        if ($month !== '') {
            $negativeRows = array_values(array_filter(
                $negativeRows,
                static fn (array $row): bool => (string) ($row['summary_month'] ?? '') === $month,
            ));
        }

        $supplierNames = [];
        foreach ($negativeRows as $row) {
            $supplier = trim((string) ($row['supplier'] ?? ''));
            if ($supplier !== '') {
                $supplierNames[$supplier] = true;
            }
        }
        $supplierNames = array_keys($supplierNames);
        sort($supplierNames, SORT_NATURAL | SORT_FLAG_CASE);

        $supplierQuery = mb_substr(trim((string) request()->query('supplier', '')), 0, 191);
        if ($supplierQuery !== '') {
            $needle = mb_strtolower($supplierQuery);
            $negativeRows = array_values(array_filter(
                $negativeRows,
                static function (array $row) use ($needle): bool {
                    $haystack = mb_strtolower(implode("\n", [
                        (string) ($row['supplier'] ?? ''),
                        (string) ($row['company'] ?? ''),
                    ]));

                    return str_contains($haystack, $needle);
                },
            ));
        }

        $supplierCounts = [];
        foreach ($negativeRows as $row) {
            $key = trim((string) ($row['company'] ?? '')) . "\0" . trim((string) ($row['supplier'] ?? ''));
            $supplierCounts[$key] = true;
        }

        $total = count($negativeRows);
        $pages = max((int) ceil($total / self::PER_PAGE), 1);
        $page = min(max((int) request()->query('page', 1), 1), $pages);
        $items = array_map(
            static fn (array $row): object => (object) $row,
            array_slice($negativeRows, ($page - 1) * self::PER_PAGE, self::PER_PAGE),
        );

        return [
            'view' => 'business.pages.negative-alerts.supplier-negative-alert',
            'negativeAlertFields' => collect($this->registry->fields(
                PayablesFinalRegistry::SECTION_SUPPLIER,
                self::DATASET,
            ))->map(
                static fn (array $definition, string $name): array => ['name' => $name] + $definition,
            )->values()->all(),
            'negativeAlertRows' => new LengthAwarePaginator(
                $items,
                $total,
                self::PER_PAGE,
                $page,
                [
                    'path' => request()->url(),
                    'query' => request()->except('page'),
                ],
            ),
            'negativeAlertMonths' => $months,
            'negativeAlertMonth' => $month,
            'negativeAlertSupplier' => $supplierQuery,
            'negativeAlertSupplierNames' => $supplierNames,
            'negativeAlertSupplierCount' => count($supplierCounts),
            'negativeAlertTotal' => $total,
            'negativeAlertSourceUrl' => route('business.pages.show', [
                'section' => 'supplier-payables-final',
                'page' => 'supplier-payables-report',
            ]),
        ];
    }

    private function number(mixed $value): ?float
    {
        if ($value === null || trim((string) $value) === '') {
            return null;
        }

        $normalized = str_replace([',', '，', ' '], '', trim((string) $value));

        return is_numeric($normalized) ? (float) $normalized : null;
    }
}