<?php

declare(strict_types=1);

namespace App\Console\Commands;

use App\Blog\Services\CoverGenerator;
use App\Models\Post;
use Illuminate\Console\Command;
use Illuminate\Support\Facades\Log;

/**
 * 批量为文章生成 AI 封面（默认只补完全没有任何图片的文章）。
 */
class GenerateCovers extends Command
{
    protected $signature = 'covers:generate
        {--all : 全部重新生成（默认只处理没有任何封面图的文章）}
        {--limit= : 最多处理多少篇}
        {--post= : 只处理指定文章 ID，逗号分隔}
        {--model= : 图片模型，覆盖 llm_image_model 设置}
        {--style= : 附加到提示词的风格描述}
        {--dry-run : 只列出将处理的文章，不调用接口}';

    protected $description = '用 AI 为文章批量生成封面图（存入 media cover 集合）';

    public function handle(CoverGenerator $covers): int
    {
        if (! $covers->isConfigured()) {
            $this->error('LLM 未配置：请先在后台「AI 设置」或 .env 配置 LLM_BASE_URL / LLM_API_KEY');

            return self::FAILURE;
        }

        $model = $covers->model($this->option('model') ?: null);
        $style = $this->option('style') ?: null;

        $query = Post::query()->published()->orderedForList();

        if ($ids = trim((string) $this->option('post'))) {
            $query->whereIn('id', array_filter(array_map('intval', explode(',', $ids))));
        }

        $todo = $query->get()
            ->filter(fn (Post $post) => $this->option('all') || $post->coverOrFirstImageUrl() === null)
            ->values();

        if ($limit = (int) $this->option('limit')) {
            $todo = $todo->take($limit)->values();
        }

        if ($todo->isEmpty()) {
            $this->info('没有需要生成封面的文章。');

            return self::SUCCESS;
        }

        $this->info("待处理 {$todo->count()} 篇，模型 {$model}");

        if ($this->option('dry-run')) {
            foreach ($todo as $post) {
                $this->line("[{$post->id}] {$post->title}");
            }

            return self::SUCCESS;
        }

        $ok = 0;
        $fail = 0;

        foreach ($todo as $post) {
            try {
                $covers->generateFor($post, $model, $style);
                $ok++;
                $this->info("✔ [{$post->id}] {$post->title}");
            } catch (\Throwable $e) {
                $fail++;
                $this->warn("✘ [{$post->id}] {$post->title}：{$e->getMessage()}");
                Log::warning('covers:generate 失败', ['post_id' => $post->id, 'error' => $e->getMessage()]);
            }
        }

        $this->info("完成：成功 {$ok}，失败 {$fail}");

        return $ok === 0 && $fail > 0 ? self::FAILURE : self::SUCCESS;
    }
}