<?php

namespace Modules\EcommerceFinance\Http\Controllers;

use App\Utilities\SidebarPermissions;
use Modules\EcommerceFinance\Http\Concerns\DecoratesLedgerRemarks;
use Illuminate\Http\Request;
use Illuminate\Routing\Controller;
use Modules\EcommerceFinance\Models\AlipayBill;
use Modules\EcommerceFinance\Repositories\StoreReceivingAlipayBillMirrorRepository;
use RuntimeException;

class AlipayBills extends Controller
{
    use DecoratesLedgerRemarks;
    public const EXPORT_COLUMNS = [
        'record_code' => '记录编码',
        'store_name' => '原始店铺',
        'ledger_remark' => '总账备注',
        'custom_remark' => '自定义备注',
        'bill_item' => '账单项目',
        'alipay_account' => '支付宝账号',
        'account_order_no' => '账务订单号',
        'business_serial_no' => '业务流水号',
        'merchant_order_no' => '商户订单号',
        'business_base_order_no' => '业务基础订单号',
        'goods_name' => '商品名称',
        'counterparty_account' => '对方账号',
        'occurred_at' => '发生时间',
        'income' => '收入',
        'expense' => '支出',
        'balance' => '余额',
        'business_type' => '业务类型',
        'remark' => '备注',
        'online_order_no' => '线上单号',
        'online_real_store' => '线上单号对应实际店铺',
        'business_description' => '业务描述',
        'business_bill_source' => '业务账单来源',
        'business_order_no' => '业务订单号',
        'created_at' => '创建时间',
        'updated_at' => '修改时间',
        'modifier' => '修改人',
    ];

    /**
     * 淘系支付宝账户账单列表（店铺收款账户账单 › 淘系支付宝账户）。
     * 经由 admin 路由组（web 会话）暴露，前端带 CSRF 调用即可。
     */
    public function index(Request $request, StoreReceivingAlipayBillMirrorRepository $repository)
    {
        $this->authorizeStoreReceivingBills();

        $sortable = ['occurred_at', 'income', 'expense', 'balance', 'record_code'];
        $sort = in_array($request->get('sort'), $sortable, true) ? $request->get('sort') : 'occurred_at';
        $dir = $request->get('dir') === 'asc' ? 'asc' : 'desc';
        $filters = $request->validate([
            'store_name' => ['nullable', 'string', 'max:255'],
            'ledger_remark' => ['nullable', 'string', 'max:191'],
            'source_channel' => ['nullable', 'string', 'max:128'],
            'bill_item' => ['nullable', 'string', 'max:255'],
            'business_type' => ['nullable', 'string', 'max:255'],
            'start' => ['nullable', 'date_format:Y-m-d'],
            'end' => ['nullable', 'date_format:Y-m-d', 'after_or_equal:start'],
            'keyword' => ['nullable', 'string', 'max:255'],
        ]);
        $filters = $this->withLedgerRemarkFilter(
            array_map(static fn (mixed $value): string => trim((string) $value), $filters),
            'taobao-alipay',
        );

        try {
            return response()->json($this->withLedgerRemarks(
                $repository->paginate(
                    $filters,
                    $sort,
                    $dir,
                    max((int) $request->get('page', 1), 1),
                    min(max((int) $request->get('limit', 10), 1), 100),
                ),
                'taobao-alipay',
            ));
        } catch (RuntimeException $exception) {
            if ($exception->getMessage() !== 'store_receiving_alipay_bill_mirror_not_ready') {
                throw $exception;
            }

            return response()->json([
                'message' => '淘系支付宝账单共享业务镜像正在首次同步，完成后将自动显示。',
                'data' => [],
                'total' => 0,
                'current_page' => 1,
                'last_page' => 1,
                'per_page' => min(max((int) $request->get('limit', 10), 1), 100),
                'summary' => ['income' => 0, 'expense' => 0, 'balance' => 0, 'count' => 0],
            ], 503);
        }
    }

    public function filterOptions(StoreReceivingAlipayBillMirrorRepository $repository)
    {
        $this->authorizeStoreReceivingBills();

        $ledgerRemarks = $this->ledgerRemarkMap()->remarksForTab('taobao-alipay');

        try {
            return response()->json($repository->filterOptionsForChannel(
                'alipayCSV', StoreReceivingAlipayBillMirrorRepository::DATASET, true
            ) + ['ledger_remarks' => $ledgerRemarks]);
        } catch (RuntimeException $exception) {
            if (! in_array($exception->getMessage(), [
                'store_receiving_alipay_bill_mirror_not_ready',
                'store_receiving_bill_filter_options_busy',
            ], true)) {
                throw $exception;
            }

            return response()->json([
                'message' => $exception->getMessage() === 'store_receiving_bill_filter_options_busy'
                    ? '淘系支付宝筛选选项正在生成，请稍后重试。'
                    : '淘系支付宝账单共享业务镜像正在首次同步，筛选选项稍后可用。',
                'shops' => [],
                'bill_items' => [],
                'ledger_remarks' => $ledgerRemarks,
            ], 503);
        }
    }

    public function export(Request $request, StoreReceivingAlipayBillMirrorRepository $repository)
    {
        $this->authorizeStoreReceivingBills();
        $exportToken = $this->exportProgressToken($request);
        $exportTotal = max(0, (int) $request->get('total', 0));
        $this->putExportProgress($exportToken, 0, $exportTotal);

        $filters = $request->validate([
            'store_name' => ['nullable', 'string', 'max:255'],
            'ledger_remark' => ['nullable', 'string', 'max:191'],
            'source_channel' => ['nullable', 'string', 'max:128'],
            'bill_item' => ['nullable', 'string', 'max:255'],
            'business_type' => ['nullable', 'string', 'max:255'],
            'start' => ['nullable', 'date_format:Y-m-d'],
            'end' => ['nullable', 'date_format:Y-m-d', 'after_or_equal:start'],
            'keyword' => ['nullable', 'string', 'max:255'],
            'columns' => ['nullable', 'array', 'max:25'],
            'columns.*' => ['string', 'max:64'],
        ]);

        $columns = $this->requestedExportColumns($filters['columns'] ?? []);
        unset($filters['columns']);
        $filters = $this->withLedgerRemarkFilter(
            array_map(static fn (mixed $value): string => trim((string) $value), $filters),
            'taobao-alipay',
        );

        try {
            $sortable = ['record_code', 'occurred_at', 'income', 'expense', 'balance'];
            $sort = in_array($request->get('sort'), $sortable, true) ? $request->get('sort') : 'occurred_at';
            $dir = $request->get('dir') === 'asc' ? 'asc' : 'desc';
            $rows = $repository->exportRows($filters, $sort, $dir);
        } catch (RuntimeException $exception) {
            if ($exception->getMessage() !== 'store_receiving_alipay_bill_mirror_not_ready') {
                throw $exception;
            }

            return response()->json(['message' => '淘系支付宝账单共享业务镜像正在首次同步，完成后将自动显示。'], 503);
        }

        $rows = $this->ledgerRemarkRows($rows, 'taobao-alipay');

        return response()->streamDownload(function () use ($rows, $columns, $exportToken, $exportTotal): void {
            // 大账期要逐行生成几分钟：立刻把表头发给浏览器并关掉输出缓冲，
            // 否则用户点「导出」后长时间没有任何反馈，会误判成导不出来。
            while (ob_get_level() > 0) {
                ob_end_flush();
            }
            $csv = fopen('php://output', 'w');
            fputs($csv, chr(0xEF) . chr(0xBB) . chr(0xBF));
            fputcsv($csv, array_values($columns));
            flush();
            $written = 0;
            foreach ($rows as $row) {
                fputcsv($csv, array_map(
                    fn (string $field): string => $this->csvValue($row[$field] ?? '', $field),
                    array_keys($columns),
                ));
                $written++;
                if ($written % 5000 === 0) {
                    $this->putExportProgress($exportToken, $written, $exportTotal);
                }
            }
            fclose($csv);
            $this->putExportProgress($exportToken, $written, $exportTotal, 'done');
        }, 'taobao_alipay_bills.csv', [
            'Content-Type' => 'text/csv; charset=UTF-8',
            // 反向代理（服务器上的 nginx）不能缓冲这个响应，否则浏览器要等整个文件生成完才开始下载。
            'X-Accel-Buffering' => 'no',
        ]);
    }

    /** @return array<string,string> */
    private function requestedExportColumns(array $requested): array
    {
        if ($requested === []) {
            return self::EXPORT_COLUMNS;
        }

        $columns = [];
        foreach ($requested as $field) {
            if (isset(self::EXPORT_COLUMNS[$field])) {
                $columns[$field] = self::EXPORT_COLUMNS[$field];
            }
        }

        abort_if($columns === [], 422, '至少选择一个可导出的字段。');

        return $columns;
    }

    private function csvValue(mixed $value, string $field): string
    {
        $text = (string) ($value ?? '');
        if (preg_match('/(?:_no|_code|serial|goods_name)$/', $field) && preg_match('/^\d{12,}$/', $text)) {
            return "\t" . $text;
        }

        return preg_match('/^[=+\-@]/', $text) ? "'" . $text : $text;
    }

    public function show(AlipayBill $bill)
    {
        $this->authorizeStoreReceivingBills();

        return response()->json($bill);
    }

    protected function authorizeStoreReceivingBills(): void
    {
        $section = collect(SidebarPermissions::navigationFor(user()))
            ->firstWhere('slug', 'billing-transactions');
        $page = collect($section['pages'] ?? [])
            ->firstWhere('slug', 'store-receiving-bills');

        abort_if(empty($page), 403, '当前账号没有店铺收款账户账单权限。');
    }
}