<?php

declare(strict_types=1);

namespace app\admin\controller\docs;

use app\common\controller\Backend;
use app\common\library\docs\MarkdownDocReader;
use support\Response;
use Webman\Http\Request;

/**
 * 后台只读展示《36字花-移动端接口设计草案》Markdown，并提供下载。
 */
class Doc36ZiHuaMobileApi extends Backend
{
    private const DOC_ZH = [
        'relative' => 'docs' . DIRECTORY_SEPARATOR . '36字花-移动端接口设计草案.md',
        'filename' => '36字花-移动端接口设计草案.md',
        'ascii_fallback' => '36zihua-mobile-api-design-draft.md',
    ];

    private const DOC_EN = [
        'relative' => 'docs' . DIRECTORY_SEPARATOR . 'en' . DIRECTORY_SEPARATOR . '36zihua-mobile-api-design-draft.md',
        'filename' => '36zihua-mobile-api-design-draft.md',
        'ascii_fallback' => '36zihua-mobile-api-design-draft.md',
    ];

    public function content(Request $request): Response
    {
        $response = $this->initializeBackend($request);
        if ($response !== null) {
            return $response;
        }

        $doc = MarkdownDocReader::resolve($request, self::DOC_ZH, self::DOC_EN);
        if (!is_file($doc['path'])) {
            return $this->error(__('Document file not found'));
        }

        $raw = file_get_contents($doc['path']);
        if ($raw === false) {
            return $this->error(__('Failed to read document'));
        }

        return $this->success('', [
            'markdown' => $raw,
            'filename' => $doc['filename'],
            'lang' => $doc['lang'],
        ]);
    }

    public function download(Request $request): Response
    {
        $response = $this->initializeBackend($request);
        if ($response !== null) {
            return $response;
        }

        $doc = MarkdownDocReader::resolve($request, self::DOC_ZH, self::DOC_EN);
        if (!is_file($doc['path'])) {
            return $this->error(__('Document file not found'));
        }

        $body = file_get_contents($doc['path']);
        if ($body === false) {
            return $this->error(__('Failed to read document'));
        }

        $disposition = sprintf(
            'attachment; filename="%s"; filename*=UTF-8\'\'%s',
            $doc['ascii_fallback'],
            rawurlencode($doc['filename'])
        );

        return new Response(200, [
            'Content-Type'        => 'text/markdown; charset=UTF-8',
            'Content-Disposition' => $disposition,
            'Cache-Control'       => 'private, max-age=0, must-revalidate',
        ], $body);
    }
}