<?php

namespace app\common\tools;

use app\common\tools\ai\AiChannelManager;
use app\model\Post;

/**
 * AI 智能排版顾问.
 *
 * 分析文章内容并推荐排版配置，或优化内容以适配手机图片排版.
 */
class AiLayoutAdvisor
{
    /**
     * 分析文章并推荐排版配置.
     *
     * @param Post $post 文章模型
     *
     * @return array ['success'=>bool, 'data'=>..., 'msg'=>...]
     */
    public function analyzeAndRecommend(Post $post): array
    {
        try {
            $manager = new AiChannelManager();
            $provider = $manager->getDefaultProvider();

            if (!$provider) {
                return ['success' => false, 'msg' => 'AI 功能暂不可用，请检查后台 AI 设置'];
            }

            $systemPrompt = "你是一位专业的手机图文排版设计师。根据文章内容，推荐最适合的排版配置。"
                . "你必须返回JSON格式：{\"template\":\"minimal|magazine|mixed\",\"font\":\"source-han-sans|alibaba-puhuiti|lxgw-wenkai\","
                . "\"font_size\":14,\"reason\":\"推荐理由\"}"
                . "模板特点：minimal=白底黑字留白多适合长文，magazine=装饰线首字下沉适合正式文章，mixed=图文穿插适合图片多的文章。"
                . "字体特点：source-han-sans=思源黑体通用，alibaba-puhuiti=阿里巴巴普惠体现代感，lxgw-wenkai=霞鹜文楷文艺感。";

            $contentPreview = mb_substr(strip_tags($post->content_html ?? ''), 0, 500);
            $imageCount = substr_count($post->content_html ?? '', '<img');

            $userPrompt = "文章标题：{$post->title}\n"
                . '摘要：' . ($post->desc ?? '无') . "\n"
                . "正文前500字：{$contentPreview}\n"
                . "图片数量：{$imageCount}\n"
                . '分类：' . ($post->category_name ?? '未分类');

            $result = $provider->chatJson($systemPrompt, $userPrompt);

            return ['success' => true, 'data' => $result];
        } catch (\Exception $e) {
            return ['success' => false, 'msg' => 'AI 分析失败: ' . $e->getMessage()];
        }
    }

    /**
     * 优化内容以适配手机图片排版.
     *
     * @param Post $post 文章模型
     *
     * @return array ['success'=>bool, 'data'=>..., 'msg'=>...]
     */
    public function optimizeContent(Post $post): array
    {
        try {
            $manager = new AiChannelManager();
            $provider = $manager->getDefaultProvider();

            if (!$provider) {
                return ['success' => false, 'msg' => 'AI 功能暂不可用，请检查后台 AI 设置'];
            }

            $systemPrompt = "你是一位专业的内容编辑。优化以下文章内容，使其更适合在手机图片上展示。"
                . "要求：1.标题更简短有力 2.段落精简(每段不超过100字) 3.提炼3-5个要点"
                . "返回JSON：{\"optimized_title\":\"标题\",\"optimized_paragraphs\":[\"段落1\",\"段落2\"],\"summary_points\":[\"要点1\",\"要点2\"]}";

            $content = mb_substr(strip_tags($post->content_html ?? ''), 0, 1000);

            $userPrompt = "文章标题：{$post->title}\n原文内容：{$content}";

            $result = $provider->chatJson($systemPrompt, $userPrompt);

            return ['success' => true, 'data' => $result];
        } catch (\Exception $e) {
            return ['success' => false, 'msg' => 'AI 内容优化失败: ' . $e->getMessage()];
        }
    }
}