<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\DictItem;
use App\Models\DictType;
use App\Models\News;
use App\Support\ApiResponse;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Validation\Rule;

class NewsController extends Controller
{
    use ApiResponse;

    public function index(Request $request): JsonResponse
    {
        $query = News::query()->with(['categoryItem']);

        if ($kw = $request->query('keyword')) {
            $query->where(function ($q) use ($kw) {
                $q->where('title', 'like', "%{$kw}%")
                    ->orWhere('source', 'like', "%{$kw}%");
            });
        }
        if ($request->filled('category_dict_item_id')) {
            $query->where('category_dict_item_id', (int) $request->query('category_dict_item_id'));
        }
        if ($request->filled('status')) {
            $query->where('status', (int) $request->query('status'));
        }
        if ($request->filled('crawl_job_id')) {
            $query->where('crawl_job_id', (int) $request->query('crawl_job_id'));
        }
        if ($request->filled('has_cover')) {
            $has = (int) $request->query('has_cover');
            if ($has === 1) {
                $query->whereNotNull('cover_url')->where('cover_url', '!=', '');
            } else {
                $query->where(function ($q) {
                    $q->whereNull('cover_url')->orWhere('cover_url', '');
                });
            }
        }

        $paginator = $query
            ->orderByDesc('published_at')
            ->orderByDesc('id')
            ->paginate((int) $request->query('page_size', 20))
            ->withQueryString();

        $paginator->getCollection()->transform(fn (News $n) => $this->serializeList($n));

        return $this->paginated($paginator);
    }

    public function store(Request $request): JsonResponse
    {
        if (! DictType::query()->where('code', 'news_category')->where('status', 1)->exists()) {
            return $this->fail('字典「资讯分类」未配置，请执行 NewsDictionarySeeder 或在字典中维护 news_category', 422);
        }

        $data = $this->validatedNews($request);
        $row = News::query()->create($data);

        return $this->ok(['id' => $row->id], '已创建');
    }

    public function show(int $news): JsonResponse
    {
        $model = News::query()->with(['categoryItem'])->findOrFail($news);

        return $this->ok($this->serializeDetail($model));
    }

    public function update(Request $request, int $news): JsonResponse
    {
        $model = News::query()->findOrFail($news);
        $data = $this->validatedNews($request, partial: true);
        $model->fill($data);
        $model->save();

        return $this->ok(null, '已保存');
    }

    public function destroy(int $news): JsonResponse
    {
        News::query()->findOrFail($news)->delete();

        return $this->ok(null, '已删除');
    }

    /** 发布：status=1 并写入发布时间 */
    public function publish(Request $request, int $news): JsonResponse
    {
        $data = $request->validate([
            'status' => ['required', 'integer', 'in:0,1'],
            'published_at' => ['nullable', 'date'],
        ]);
        $model = News::query()->findOrFail($news);
        $model->status = (int) $data['status'];
        if ($model->status === 1) {
            $model->published_at = isset($data['published_at'])
                ? \Carbon\Carbon::parse($data['published_at'])
                : ($model->published_at ?? now());
        } else {
            $model->published_at = null;
        }
        $model->save();

        return $this->ok(null, '已更新发布状态');
    }

    /**
     * @return array<string, mixed>
     */
    protected function validatedNews(Request $request, bool $partial = false): array
    {
        $categoryTypeId = DictType::query()->where('code', 'news_category')->where('status', 1)->value('id');

        $rules = [
            'title' => [$partial ? 'sometimes' : 'required', 'string', 'max:255'],
            'category_dict_item_id' => $this->dictItemRules($categoryTypeId, $partial ? 'sometimes' : 'required'),
            'source' => ['nullable', 'string', 'max:128'],
            'cover_url' => ['nullable', 'string', 'max:512'],
            'content_html' => [$partial ? 'sometimes' : 'required', 'string'],
            'published_at' => [$partial ? 'sometimes' : 'required', 'date'],
            'status' => ['nullable', 'integer', 'in:0,1'],
        ];

        return $request->validate($rules);
    }

    /**
     * @return array<int, \Illuminate\Contracts\Validation\Rule|string>
     */
    protected function dictItemRules(?int $dictTypeId, string $presence): array
    {
        if (! $dictTypeId) {
            return match ($presence) {
                'required' => ['required', 'integer'],
                'sometimes' => ['sometimes', 'nullable', 'integer'],
                default => ['nullable', 'integer'],
            };
        }

        $exists = Rule::exists('dict_items', 'id')->where(
            fn ($q) => $q->where('dict_type_id', $dictTypeId)->where('status', 1)
        );

        return match ($presence) {
            'required' => ['required', 'integer', $exists],
            'sometimes' => ['sometimes', 'nullable', 'integer', $exists],
            default => ['nullable', 'integer', $exists],
        };
    }

    /**
     * @return array<string, mixed>
     */
    protected function serializeList(News $n): array
    {
        return [
            'id' => $n->id,
            'title' => $n->title,
            'category_dict_item_id' => $n->category_dict_item_id,
            'category_item' => $this->serializeDictItem($n->categoryItem),
            'source' => $n->source,
            'source_url' => $n->source_url,
            'cover_url' => $n->cover_url,
            'has_cover' => $n->cover_url ? 1 : 0,
            'status' => (int) $n->status,
            'published_at' => $n->published_at?->toIso8601String(),
            'created_at' => $n->created_at?->toIso8601String(),
        ];
    }

    /**
     * @return array<string, mixed>
     */
    protected function serializeDetail(News $n): array
    {
        $row = $this->serializeList($n);
        $row['content_html'] = $n->content_html;

        return $row;
    }

    /**
     * @return array{id:int,label:string,value:string}|null
     */
    protected function serializeDictItem(?DictItem $item): ?array
    {
        if (! $item) {
            return null;
        }

        return [
            'id' => $item->id,
            'label' => $item->label,
            'value' => $item->value,
        ];
    }
}