<?php

namespace Modules\EcommerceFinance\View;

use App\Http\Controllers\Business\PayablesFinalActions;
use Modules\EcommerceFinance\Services\SupplierPayableOverrideStore;
use Modules\EcommerceFinance\Services\SupplierReturnConfirmation;
use Modules\EcommerceFinance\Services\SupplierStatementMatcher;
use Modules\EcommerceFinance\Services\SupplierStatementStore;

/**
 * 「供应商对账」页面数据：
 * - 财务端数据：按供应商汇总 + 行级差异（条码 + 单价 匹配，四类结果带结算口径）
 * - 厂家端数据：厂家上传的对账单（实时）与只读的退货明细
 */
class SupplierReconciliationPageData
{
    /** 厂家上传的对账数据表：每页行数（短表 + 翻页）。 */
    private const PER_PAGE = 15;

    public function __construct(
        private readonly SupplierPayableOverrideStore $store,
        private readonly SupplierStatementStore $statements,
        private readonly SupplierStatementMatcher $matcher,
        private readonly SupplierReturnConfirmation $returnConfirmations,
    ) {
    }

    /** @return array<string,mixed> */
    public function financeData(): array
    {
        $companyId = $this->companyId();
        $mine = $this->store->listRows(
            PayablesFinalActions::DATASET_PREFIX . 'supplier:payment-reconciliation',
            $companyId,
        );

        $months = [];
        foreach ($mine as $row) {
            $month = substr(trim((string) ($row['summary_month'] ?? '')), 0, 7);
            if ($month !== '') {
                $months[$month] = true;
            }
        }
        $months = array_keys($months);
        rsort($months);

        $month = trim((string) request()->query('month', ''));
        if ($month !== '' && preg_match('/^\d{4}-\d{2}$/', $month) === 1) {
            $mine = array_values(array_filter(
                $mine,
                static fn (array $row): bool => substr(trim((string) ($row['summary_month'] ?? '')), 0, 7) === $month,
            ));
        } else {
            $month = '';
        }

        $reconcilers = [];
        foreach ($mine as $row) {
            $name = trim((string) ($row['reconciler'] ?? ''));
            if ($name !== '') {
                $reconcilers[$name] = true;
            }
        }
        $reconcilers = array_keys($reconcilers);
        sort($reconcilers);

        $reconciler = trim((string) request()->query('reconciler', ''));
        if ($reconciler !== '') {
            $mine = array_values(array_filter(
                $mine,
                static fn (array $row): bool => trim((string) ($row['reconciler'] ?? '')) === $reconciler,
            ));
        }

        $suppliers = [];
        foreach ($mine as $row) {
            $name = trim((string) ($row['supplier'] ?? ''));
            if ($name !== '') {
                $suppliers[$name] = true;
            }
        }
        foreach ($this->statements->uploadedSuppliers($companyId) as $name) {
            $suppliers[$name] = true;
        }
        $supplierNames = array_keys($suppliers);
        sort($supplierNames);

        $uploads = [];
        foreach ($supplierNames as $name) {
            $latest = $this->statements->uploads($name, $companyId, 1);
            $uploads[$name] = $latest[0] ?? null;
        }

        // 选中厂家时页面切换成「比对明细」视图（列表不再渲染，避免 100+ 家时往下翻）。
        $selected = trim((string) request()->query('supplier', ''));
        $detail = null;
        if ($selected !== '' && in_array($selected, $supplierNames, true)) {
            $detail = $this->detail($mine, $selected, $companyId);
        } else {
            $selected = '';
        }

        return [
            'view' => 'business.pages.supplier-reconciliation.finance-data',
            'supplierNames' => $supplierNames,
            'uploads' => $uploads,
            'months' => $months,
            'month' => $month,
            'reconcilers' => $reconcilers,
            'reconciler' => $reconciler,
            'selectedSupplier' => $selected,
            'detail' => $detail,
            'listUrl' => route('business.pages.show', array_filter([
                'section' => 'supplier-reconciliation',
                'page' => 'finance-data',
                'month' => $month,
                'reconciler' => $reconciler,
            ], static fn (mixed $value): bool => $value !== '' && $value !== null)),
            'statementTemplateUrl' => route('business.supplier-reconciliation.template'),
            'uploadUrl' => route('business.supplier-reconciliation.statement.upload'),
        ];
    }

    /** @return array<string,mixed> */
    public function supplierData(): array
    {
        $companyId = $this->companyId();
        $mine = $this->store->listRows(
            PayablesFinalActions::DATASET_PREFIX . 'supplier:payment-reconciliation',
            $companyId,
        );

        $suppliers = [];
        foreach ($mine as $row) {
            $name = trim((string) ($row['supplier'] ?? ''));
            if ($name !== '') {
                $suppliers[$name] = true;
            }
        }
        foreach ($this->statements->uploadedSuppliers($companyId) as $name) {
            $suppliers[$name] = true;
        }
        $supplierNames = array_keys($suppliers);
        sort($supplierNames);

        $selected = trim((string) request()->query('supplier', ''));
        if ($selected === '' || ! in_array($selected, $supplierNames, true)) {
            $selected = $supplierNames[0] ?? '';
        }

        $page = max((int) request()->query('rows_page', 1), 1);
        $statementRows = $selected !== '' ? $this->statements->rows($selected, $companyId) : [];
        $returnRows = $selected !== '' ? $this->returnRows($selected, $companyId) : [];
        $returnPanel = $selected !== '' ? $this->returnConfirmationPanel($selected, $returnRows, $companyId) : null;

        return [
            'view' => 'business.pages.supplier-reconciliation.supplier-data',
            'supplierNames' => $supplierNames,
            'selectedSupplier' => $selected,
            'uploads' => $selected !== '' ? $this->statements->uploads($selected, $companyId) : [],
            'statementRows' => array_slice($statementRows, ($page - 1) * self::PER_PAGE, self::PER_PAGE),
            'statementTotal' => count($statementRows),
            'returnPanel' => $returnPanel,
            'rowsPage' => $page,
            'perPage' => self::PER_PAGE,
            'statementTemplateUrl' => route('business.supplier-reconciliation.template'),
            'uploadUrl' => route('business.supplier-reconciliation.statement.upload'),
            'returnConfirmUrl' => route('business.supplier-reconciliation.return.confirm'),
            'returnDisputeUrl' => route('business.supplier-reconciliation.return.dispute'),
            'returnConfirmAllUrl' => route('business.supplier-reconciliation.return.confirm-all'),
        ];
    }

    /**
     * 退货扣减确认面板：共 N 行、合计扣减、异议暂不扣减；表格展示金额最高的 15 行。
     *
     * @param  list<array<string,mixed>>  $returnRows
     * @return array<string,mixed>
     */
    private function returnConfirmationPanel(string $supplier, array $returnRows, int $companyId): array
    {
        $statuses = $this->returnConfirmations->statuses($supplier, $companyId);
        $total = 0.0;
        $confirmedAmount = 0.0;
        $disputedAmount = 0.0;
        $disputedCount = 0;
        $confirmedCount = 0;

        $rows = [];
        foreach ($returnRows as $row) {
            $key = (string) ($row['_action_key'] ?? '');
            $deduction = $this->returnDeduction($row);
            $status = $statuses[$key] ?? '';

            $total += $deduction;
            if ($status === SupplierReturnConfirmation::STATUS_CONFIRMED) {
                $confirmedAmount += $deduction;
                $confirmedCount++;
            } elseif ($status === SupplierReturnConfirmation::STATUS_DISPUTED) {
                $disputedAmount += $deduction;
                $disputedCount++;
            }

            $rows[] = ['_key' => $key, 'status' => $status, 'deduction' => $deduction] + $row;
        }

        // 全部退货行按导入顺序分页展示（每页 15 行），不做金额排序。
        $perPage = self::PER_PAGE;
        $pages = max((int) ceil(count($rows) / $perPage), 1);
        $page = min(max((int) request()->query('return_page', 1), 1), $pages);

        return [
            'supplier' => $supplier,
            'rows' => array_slice($rows, ($page - 1) * $perPage, $perPage),
            'page' => $page,
            'pages' => $pages,
            'per_page' => $perPage,
            'total_rows' => count($returnRows),
            'total_amount' => round($total, 2),
            'confirmed_count' => $confirmedCount,
            'confirmed_amount' => round($confirmedAmount, 2),
            'disputed_count' => $disputedCount,
            'disputed_amount' => round($disputedAmount, 2),
        ];
    }

    /** 扣减金额：金额为空时用预估金额（与采购方记账口径一致）。 */
    private function returnDeduction(array $row): float
    {
        $amount = trim((string) ($row['amount'] ?? ''));
        if ($amount !== '' && is_numeric(str_replace(',', '', $amount))) {
            return (float) str_replace(',', '', $amount);
        }

        $guess = trim((string) ($row['guess_amount'] ?? ''));

        return is_numeric(str_replace(',', '', $guess)) ? (float) str_replace(',', '', $guess) : 0.0;
    }

    /** @return array<string,mixed> */
    private function detail(array $mine, string $supplier, int $companyId): array
    {
        $mineRows = array_values(array_filter(
            $mine,
            static fn (array $row): bool => trim((string) ($row['supplier'] ?? '')) === $supplier,
        ));
        $theirRows = $this->statements->rows($supplier, $companyId);

        $compared = $this->matcher->compare($mineRows, $theirRows);
        $compared['mineRows'] = count($mineRows);
        $compared['theirsRows'] = count($theirRows);

        return $compared;
    }

    /** @return list<array<string,mixed>> 该厂家的退货明细（我方数据，展示给厂家确认扣减） */
    public function returnRows(string $supplier, int $companyId): array
    {
        $rows = $this->store->listRows(
            PayablesFinalActions::DATASET_PREFIX . 'supplier:return-reconciliation',
            $companyId,
        );

        return array_values(array_filter(
            $rows,
            static fn (array $row): bool => trim((string) ($row['supplier'] ?? '')) === $supplier,
        ));
    }

    private function companyId(): int
    {
        return (int) (company_id() ?: 1);
    }
}