<?php

declare(strict_types=1);

namespace App\Console\Commands;

use App\Blog\Services\LlmClient;
use App\Models\Post;
use Illuminate\Console\Command;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Str;

/**
 * 用 AI 图像接口（OpenAI 兼容 /image_generation，如 MiniMax image-01）批量生成文章封面。
 * 复用「AI 设置」里的 llm_base_url / llm_api_key，模型取 llm_image_model（默认 image-01）。
 */
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(LlmClient $llm): int
    {
        if (! $llm->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;
        }

        $model = (string) ($this->option('model') ?: blog_setting('llm_image_model', 'image-01'));

        // 站点无常驻 queue worker：批量生成期间同步产出 card 转换，避免永远卡在队列里。
        config(['media-library.queue_conversions_by_default' => false]);

        $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 {
                $this->generateFor($post, $llm, $model);
                $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;
    }

    private function generateFor(Post $post, LlmClient $llm, string $model): void
    {
        $response = Http::timeout(120)
            ->withToken($llm->apiKey())
            ->post($llm->baseUrl().'/image_generation', [
                'model' => $model,
                'prompt' => $this->buildPrompt($post),
                'aspect_ratio' => '16:9',
                'response_format' => 'url',
                'n' => 1,
                'prompt_optimizer' => true,
            ]);

        if ($response->failed()) {
            throw new \RuntimeException('HTTP '.$response->status().'：'.Str::limit($response->body(), 200));
        }

        $url = $response->json('data.image_urls.0');
        if (! is_string($url) || $url === '') {
            $reason = $response->json('base_resp.status_msg') ?: $response->body();

            throw new \RuntimeException('接口未返回图片：'.Str::limit((string) $reason, 200));
        }

        $image = Http::timeout(60)->get($url)->throw();
        $ext = match (strtolower(explode(';', (string) $image->header('Content-Type'))[0])) {
            'image/png' => 'png',
            'image/webp' => 'webp',
            default => 'jpg',
        };

        $tmp = tempnam(sys_get_temp_dir(), 'cover_');
        file_put_contents($tmp, $image->body());

        try {
            $post->addMedia($tmp)
                ->usingFileName('cover-'.$post->id.'.'.$ext)
                ->toMediaCollection('cover');
        } finally {
            @unlink($tmp);
        }
    }

    private function buildPrompt(Post $post): string
    {
        $style = trim((string) ($this->option('style')
            ?: blog_setting('cover_prompt_style', '扁平插画风格，色调柔和，构图简洁')));
        $excerpt = Str::limit(trim(strip_tags((string) $post->excerpt)), 60, '');

        $parts = ["为博客文章《{$post->title}》生成一张封面配图"];
        if ($excerpt !== '') {
            $parts[] = "内容大意：{$excerpt}";
        }
        $parts[] = $style;
        $parts[] = '画面中不要出现任何文字';

        return implode('。', $parts);
    }
}