<?php

namespace App\Services;

use App\Models\Categories;
use App\Models\Articles;
use App\Models\ArticleLikes;
use App\Models\Tags;
use App\Services\CacheService;

class ArticlesService
{
    /**
     * 第一步：文章创建时，生成一个“7天点赞计划”
     * 规则：第一天占 70%，剩下 6 天分摊 30%，全部为整数
     */
    public function generateSevenDayPlan(int $iTargetTotal): string
    {
        if ($iTargetTotal <= 0) return '[]';

        $aPlan = array_fill(0, 7, 0);
        
        // 1. 第一天分配 70% (向上取整，保证第一天绝对有动作)
        $iDay1Likes = (int) ceil($iTargetTotal * 0.7);
        $aPlan[0] = $iDay1Likes;

        // 2. 剩下的 30% 分配给后面 6 天
        $iRemaining = $iTargetTotal - $iDay1Likes;
        if ($iRemaining > 0) {
            // 随机把剩下的点赞塞进后 6 天的坑位里
            for ($i = 0; $i < $iRemaining; $i++) {
                $iRandomDay = mt_rand(1, 6);
                $aPlan[$iRandomDay]++;
            }
        }

        // 返回匈牙利命名法下的 json 字符串
        return json_encode($aPlan);
    }

    /**
     * 第二步：执行点赞任务 (建议每小时跑一次)
     * 只负责把今天该加的赞加进去
     */
    public function executeLikeTask(Article $oArticle): void
    {
        if (empty($oArticle->sLikePlan)) return;

        $aPlan = json_decode($oArticle->sLikePlan, true);
        $iDaysPassed = $oArticle->created_at->diffInDays(now());

        // 如果已经超过7天，或者计划里没这一天，直接撤退
        if ($iDaysPassed > 6 || !isset($aPlan[$iDaysPassed])) {
            return;
        }

        $iShouldHaveAdded = $aPlan[$iDaysPassed];
        
        // 重点：为了不让点赞在凌晨一瞬间加上去，我们可以配合小时数
        // 比如现在是 14 点，我们应该加到今天总量的 14/24
        $iHour = (int) date('H');
        $iCurrentTarget = (int) floor($iShouldHaveAdded * ($iHour / 24));
        
        // 这里需要一个逻辑记录今天已经加了多少，或者直接根据小时计算增量
        // 简单处理：我们每天分 24 次把 $iShouldHaveAdded 加完
        // 为保简洁，这里展示核心逻辑更新：
        if ($iShouldHaveAdded > 0) {
            // 算出每小时平均加几个，剩下的随机掉落
            $iAddToday = $this->calculateHourlyIncrement($iShouldHaveAdded, $iHour);
            // 这里更新 i7like 字段
            // 注意：i7like 应该是这篇文章总共通过这个逻辑加了多少赞
            // ... 具体的数据库 Update 逻辑
        }
    }
    
    /**
     * 365天自动点赞：高标准随机触发
     */
    public function applyYearlyGrowth(Article $oArticle): void
    {
        $iYearlyTarget = 10; // 哪怕一年只要 10 个
        
        // 计算今天中奖的概率：10 / 365
        // 我们放大一万倍来摇号
        $iProbability = (int)(($iYearlyTarget / 365) * 10000);
        $iMagicNumber = mt_rand(1, 10000);

        if ($iMagicNumber <= $iProbability) {
            // 中奖了，加 1 个赞
            $oArticle->increment('i365like');
        }
    }
    
    public function like(int $iArticleId, string $sIp, string $sFingerprint): array
    {
        // 1. 检查是否已经点过
        $bExists = ArticleLikes::where('iArticleId', $iArticleId)
            ->where(function ($q) use ($sIp, $sFingerprint) {
                $q->where('sIp', $sIp)
                  ->orWhere('sFingerprint', $sFingerprint);
            })->exists();

        if ($bExists) {
            return ['status' => false, 'code' => 200, 'msg' => '感谢支持，点过赞了。'];
        }

        // 2. 事务扣杀
        try {
            // 定义一个变量来接收最新的点赞数
            $iNewLikeCount = 0;

            \DB::transaction(function () use ($iArticleId, $sIp, $sFingerprint, &$iNewLikeCount) {
                ArticleLikes::create([
                    'iArticleId'   => $iArticleId,
                    'sIp'          => $sIp,
                    'sFingerprint' => $sFingerprint
                ]);
                
                // 执行增加并直接获取最新的模型实例
                $oArticle = Articles::where('id', $iArticleId);
                $oArticle->increment('iLikeCount', 1, [
                                     'sLastLikedAt' => now(), // 这里的 now() 是 Laravel 提供的 Carbon 实例
                                 ]);
                $oArticle->sLastLikedAt = time();
//                $oArticle->save(); // 不对吗
                
                // 拿到自增后的最新数字
                $iNewLikeCount = $oArticle->value('iLikeCount');
            });
            
            CacheService::updateOrderLikes();
            
            return [
                'status' => true,
                'code' => 200,
                'msg' => '感谢支持！',
                'iLikeCount' => $iNewLikeCount // 药水哥绝杀：把热腾腾的数字发回去
            ];
        } catch (\Exception $e) {
//            tt($e->getMessage());
            \Log::error("点赞失败: " . $e->getMessage());
            return ['status' => false, 'code' => 500, 'msg' => '系统打了个盹，稍后再试。'];
        }
    }
    
    public function search(string $sKeywords, string $sResultType)
    {
        if (empty($sKeywords)) {
            return [];
        }

        $sKeywords = strip_tags(trim($sKeywords));
        
        $oArticles = Articles::search($sKeywords)
            ->options([
                  'attributesToHighlight' => ['sTitle', 'sContent', 'sCategoryName'],
                  // 1. 把 attributesToSnippet 改成 attributesToCrop
                  'attributesToCrop'      => ['sContent'],
                  // 2. 设置裁剪后的长度（单位是字符，按需调整）
                  'cropLength'           => 100,
                  'highlightPreTag'      => '<mark class="highlight">',
                  'highlightPostTag'     => '</mark>',
            ])
            ->orderByDesc('iIsTop')
            ->paginate(config('app.page_limit'));

        $oArticles->getCollection()->transform(function ($oArticle) {

            $aMeta = $oArticle->scoutMetadata();
            $aFormatted = $aMeta['_formatted'] ?? [];

            if (!empty($aFormatted)) {
                $oArticle->sTitle = $aFormatted['sTitle'] ?? $oArticle->sTitle;
                $oArticle->sContent = $aFormatted['sContent'] ?? $oArticle->sContent;
                
                if (isset($aFormatted['sCategoryName'])) {
                    $oArticle->sCategoryName = $aFormatted['sCategoryName'];
                    $oArticle->setRelation('oCategory', (object)[
                        'sName' => $aFormatted['sCategoryName'],
                        'sSlug' => $oArticle->sCategorySlug ?? ''
                    ]);
                }
            }

            return $oArticle;
        });
        
        if ($sResultType === "ajax") {
            $sHtml = '';
            foreach ($oArticles as $oArticle) {
                $sHtml .= view('components.article-item', ['oArticle' => $oArticle])->render();
            }
            $xResult = $sHtml;
        } else {
            $xResult = [
                'oArticles'     => $oArticles,
            ];
        }
        
        return $xResult;
    }
    
    public function getTagArticles(string $sSlug, string $sResultType)
    {
        $oTags = Tags::where('sSlug', $sSlug)->firstOrFail();
        
        $oArticles = $oTags->oArticles()
                ->where('iStatus', 1) // 只拿已发布的
                ->with(['oCategory']) // 预加载关联，拒绝 N+1
                ->orderByDesc('iIsTop') // 置顶优先
                ->orderByDesc('created_at') // 最新优先
                ->paginate(config('app.page_limit')); // 必须分页，否则数据多了会爆内存
        
        if ($sResultType === "ajax") {
            $sHtml = '';
            foreach ($oArticles as $oArticle) {
                $sHtml .= view('components.article-item', ['oArticle' => $oArticle])->render();
            }
            $xResult = $sHtml;
        } else {
            $xResult = [
                'oArticles'     => $oArticles,
            ];
        }
        
        return $xResult;
    }
    
    public function getCategoryArticles(string $sSlug, string $sResultType)
    {
        $oCategory = Categories::where('sSlug', $sSlug)->firstOrFail();
        
        if ($oCategory->iShowChildren) {
            $aCategoryIds = Categories::where('iParentId', $oCategory->id)
                ->pluck('id')
                ->push($oCategory->id)
                ->toArray();
        } else {
            $aCategoryIds = [$oCategory->id];
        }

        $oArticles = Articles::whereIn('iCategoryId', $aCategoryIds)
            ->with(['oUser', 'oCategory'])
            ->orderBy('iIsTop', 'desc')
            ->orderBy('created_at', 'desc')
            ->simplePaginate(config('app.page_limit'));

        if ($sResultType === "ajax") {
            $sHtml = '';
            foreach ($oArticles as $oArticle) {
                $sHtml .= view('components.article-item', ['oArticle' => $oArticle])->render();
            }
            $aResult = $sHtml;
        } else {
            $aResult = [
                'oCategory' => $oCategory,
                'oArticles'     => $oArticles,
            ];
        }
        
        return $aResult;
    }

    public function getArticle(string $sArticleSlug, string $sIp, string $sFingerprint)
    {
        $oArticle = Articles::where('sSlug', $sArticleSlug)
                    ->where('iStatus', 1)
                    ->with(['oCategory.oParent', 'oTags'])
                    ->firstOrFail();

        $oArticle->bIsLiked = ArticleLikes::where('iArticleId', $oArticle->id)
            ->where(function($q) use ($sIp, $sFingerprint) {
                $q->where('sIp', $sIp)
                  ->orWhere('sFingerprint', $sFingerprint);
            })->exists();

//        return $oArticle;
        return [
            'oArticle' => $oArticle
        ];
    }
}