<?php

namespace app\common\service;

use app\common\model\user\User;
use think\facade\Db;

/**
 * 短链接分享海报文本与素材的统一构造服务
 */
class ShortLinkPosterDataService
{
    /**
     * 获取海报展示用的全部文本与素材
     */
    public static function build(string $pageType, $pageId, ?int $userId, string $clientTitle = '', string $clientDesc = ''): array
    {
        $title = trim($clientTitle);
        $description = trim($clientDesc);

        if ($title === '' || $description === '') {
            $detail = self::resolvePageDetail($pageType, $pageId);
            if ($title === '') {
                $title = $detail['title'];
            }
            if ($description === '') {
                $description = $detail['description'];
            }
        }

        $sharer = ['nickname' => '', 'avatar' => ''];
        if (!empty($userId)) {
            $user = User::field('nickname,avatar')->findOrEmpty($userId);
            if (!$user->isEmpty()) {
                $sharer['nickname'] = (string) $user->getData('nickname');
                $sharer['avatar'] = (string) $user->avatar;
            }
        }

        $posterImageUri = (string) ConfigService::get('website', 'share_poster', '');
        $posterImage = $posterImageUri ? FileService::getFileUrl($posterImageUri) : '';
        $posterTitle = (string) ConfigService::get('website', 'share_poster_title', '');

        return [
            'poster_image_uri' => $posterImageUri,
            'poster_image' => $posterImage,
            'poster_title' => $posterTitle,
            'title' => $title,
            'description' => $description,
            'sharer' => $sharer,
        ];
    }

    /**
     * 根据 page_type / page_id 自动取页面标题与描述
     */
    private static function resolvePageDetail(string $pageType, $pageId): array
    {
        $empty = ['title' => '', 'description' => ''];
        if ($pageId === '' || $pageId === null) {
            return $empty;
        }

        switch ($pageType) {
            case 'news':
                $row = Db::name('article')
                    ->field('title,desc,abstract')
                    ->where('id', (int) $pageId)
                    ->find();
                if (empty($row)) {
                    return $empty;
                }
                $desc = $row['desc'] ?: mb_substr(strip_tags((string) $row['abstract']), 0, 80);
                return ['title' => (string) $row['title'], 'description' => (string) $desc];

            case 'match':
                $row = Db::name('match')
                    ->field('home_team,away_team,league_name')
                    ->where('id', (int) $pageId)
                    ->find();
                if (empty($row)) {
                    return $empty;
                }
                return [
                    'title' => $row['home_team'] . ' vs ' . $row['away_team'],
                    'description' => (string) $row['league_name'],
                ];

            case 'post':
            case 'community':
                $row = Db::name('community_post')
                    ->field('content')
                    ->where('id', (int) $pageId)
                    ->find();
                if (empty($row)) {
                    return $empty;
                }
                $text = mb_substr(strip_tags((string) $row['content']), 0, 80);
                return ['title' => $text ?: '社区帖子', 'description' => ''];

            case 'crypto':
                return ['title' => $pageId . '/USDT 行情', 'description' => '加密货币实时行情'];

            case 'invite':
                return ['title' => '邀请你加入我的团队', 'description' => ''];
        }

        return $empty;
    }
}