<?php

namespace App\Http\Controllers\Business;

use App\Business\CourierPayableSummaryFilter;
use App\Business\CourierPayableSummaryStore;
use App\Utilities\SidebarPermissions;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Routing\Controller;
use RuntimeException;
use Symfony\Component\HttpFoundation\BinaryFileResponse;
use Symfony\Component\HttpFoundation\StreamedResponse;

class CourierPayableSummaries extends Controller
{
    private const IMPORT_TEMPLATES = [
        'freight-difference' => [
            'path' => 'templates/courier-payables/freight-difference-import-template.xlsx',
            'ascii_name' => 'freight_difference_import_template.xlsx',
            'download_name' => '运费差导入模板.xlsx',
        ],
        'other-surcharge-summary' => [
            'path' => 'templates/courier-payables/other-surcharge-import-template.xlsx',
            'ascii_name' => 'other_surcharge_import_template.xlsx',
            'download_name' => '其他附加费导入模板.xlsx',
        ],
        'return-fee' => [
            'path' => 'templates/courier-payables/return-fee-import-template.xlsx',
            'ascii_name' => 'return_fee_import_template.xlsx',
            'download_name' => '退件费导入模板.xlsx',
        ],
    ];

    public function __construct(
        private readonly CourierPayableSummaryStore $store,
        private readonly CourierPayableSummaryFilter $filter,
    ) {
        $this->middleware('auth');
        $this->middleware('company.identify');
    }

    public function import(Request $request, string $summaryPage): RedirectResponse
    {
        $this->authorizePage($summaryPage);
        $this->store->title($summaryPage);
        $request->validate([
            'import' => ['required', 'file', 'mimes:xlsx,xls,csv', 'max:10240'],
        ]);

        try {
            $result = $this->store->import(
                $request->file('import'),
                (int) (company_id() ?: 1),
                $summaryPage,
                user_id() ? (int) user_id() : null,
            );
        } catch (RuntimeException $exception) {
            report($exception);

            return $this->redirectToPage($summaryPage)->with('error', '汇总数据保存失败，请稍后重试。');
        }

        return $this->redirectToPage($summaryPage)->with(
            'success',
            "导入完成：{$result['rows']} 条数据，{$result['columns']} 个字段。",
        );
    }

    public function template(string $summaryPage): BinaryFileResponse
    {
        $this->authorizePage($summaryPage);
        $template = self::IMPORT_TEMPLATES[$summaryPage] ?? null;
        abort_unless(is_array($template), 404);

        $path = resource_path($template['path']);
        abort_unless(is_file($path), 404);

        $response = response()->download($path, $template['ascii_name'], [
            'Content-Type' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
            'Cache-Control' => 'private, no-store',
        ]);

        return $response->setContentDisposition(
            'attachment',
            $template['download_name'],
            $template['ascii_name'],
        );
    }

    public function export(Request $request, string $summaryPage): StreamedResponse|RedirectResponse
    {
        $this->authorizePage($summaryPage);
        $title = $this->store->title($summaryPage);

        try {
            $snapshot = $this->store->snapshot((int) (company_id() ?: 1), $summaryPage);
        } catch (RuntimeException) {
            return $this->redirectToPage($summaryPage)->with('error', '汇总数据暂时无法读取，请重新导入后再试。');
        }

        if ($snapshot === null) {
            return $this->redirectToPage($summaryPage)->with('error', '当前没有可导出的汇总数据。');
        }

        $filters = $this->filter->fromRequest($request);
        $headers = $snapshot['headers'];
        $rows = $this->filter->apply(collect($snapshot['rows']), $headers, $filters)->values();
        $dateColumn = $this->filter->dateColumnIndex($headers);

        return response()->streamDownload(function () use ($headers, $rows, $dateColumn): void {
            $csv = fopen('php://output', 'w');

            if ($csv === false) {
                throw new RuntimeException('无法创建汇总数据导出流。');
            }

            fputs($csv, chr(0xEF) . chr(0xBB) . chr(0xBF));
            fputcsv($csv, array_map([$this, 'csvText'], $headers));

            foreach ($rows as $row) {
                fputcsv($csv, array_map(
                    fn (mixed $value, int $column): string => $this->csvText($value, $column === $dateColumn),
                    $row,
                    array_keys($row),
                ));
            }

            fclose($csv);
        }, $title . '_' . now()->format('Ymd_His') . '.csv', [
            'Content-Type' => 'text/csv; charset=UTF-8',
            'Cache-Control' => 'private, no-store',
        ]);
    }

    private function redirectToPage(string $summaryPage): RedirectResponse
    {
        return redirect()->route('business.pages.show', [
            'section' => 'courier-payables',
            'page' => $summaryPage,
        ]);
    }

    private function authorizePage(string $summaryPage): void
    {
        $section = collect(SidebarPermissions::navigationFor(user()))
            ->firstWhere('slug', 'courier-payables');
        $pages = collect($section['pages'] ?? [])->flatMap(static fn (array $page): array => [
            $page,
            ...($page['children'] ?? []),
        ]);

        abort_unless($pages->contains('slug', $summaryPage), 403, '当前账号没有该页面权限。');
    }

    private function csvText(mixed $value, bool $preserveYearMonth = false): string
    {
        $value = (string) $value;

        if ($preserveYearMonth && preg_match('/^\d{4}-(?:0[1-9]|1[0-2])$/', $value) === 1) {
            return '="' . $value . '"';
        }

        if (preg_match('/^[+-]?(?:(?:\d{1,3}(?:,\d{3})+|\d+)(?:\.\d+)?|\.\d+)%?$/u', $value) === 1) {
            return $value;
        }

        return preg_match('/^[=+\-@\t\r]/u', $value) === 1 ? "\t" . $value : $value;
    }
}