<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\CrawlJob;
use App\Models\CrawlJobItem;
use App\Models\DictItem;
use App\Models\DictType;
use App\Services\Crawl\CrawlImportService;
use App\Services\Crawl\CrawlJobRunnerService;
use App\Services\Crawl\CrawlKeywordParser;
use App\Services\Crawl\CrawlSourceResolver;
use App\Support\ApiResponse;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;

class CrawlJobController extends Controller
{
    use ApiResponse;

    public function resolveUrl(Request $request, CrawlSourceResolver $resolver): JsonResponse
    {
        $this->mergeNormalizedRequestUrl($request);

        $data = $request->validate([
            'request_url' => ['required', 'url', 'max:512'],
            'target_type' => ['required', 'in:paper,industry_news,teacher'],
        ]);

        $source = $resolver->resolve($data['request_url'], $data['target_type']);
        if (! $source) {
            return $this->fail('无法识别该地址，请确认 URL 可访问且入库类型正确', 422);
        }

        return $this->ok([
            'crawl_source_id' => $source->id,
            'source_name' => $source->name,
            'adapter_code' => $source->adapter_code,
            'target_type' => $source->target_type,
            'param_schema' => $source->param_schema,
            'entry_url' => $source->entry_url,
        ]);
    }

    public function show(int $crawlJob): JsonResponse
    {
        $job = CrawlJob::query()->with('crawlSource')->findOrFail($crawlJob);

        return $this->ok($this->serializeJob($job));
    }

    public function items(Request $request, int $crawlJob): JsonResponse
    {
        $job = CrawlJob::query()->findOrFail($crawlJob);
        $query = CrawlJobItem::query()->where('crawl_job_id', $job->id)->orderByDesc('id');

        if ($kind = $request->query('item_kind')) {
            match ($kind) {
                'paper' => $query->where('target_type', 'paper'),
                'teacher_lead' => $query->where('target_type', 'teacher_lead'),
                'teacher' => $query->where('target_type', 'teacher'),
                default => null,
            };
        }

        if ($kw = $request->query('keyword')) {
            $query->where(function ($q) use ($kw) {
                $q->where('title', 'like', "%{$kw}%")
                    ->orWhere('canonical_url', 'like', "%{$kw}%");
            });
        }

        $pageSize = min(500, max(1, (int) $request->query('page_size', 100)));
        $paginator = $query->paginate($pageSize)->withQueryString();
        $paginator->getCollection()->transform(fn (CrawlJobItem $i) => $this->serializeItem($i));

        if ($request->query('item_kind') === 'teacher_lead') {
            $sorted = $paginator->getCollection()
                ->sort(function (array $a, array $b) {
                    $aHas = ($a['lead_author_university'] ?? '') !== '' || ($a['school_name'] ?? '') !== '';
                    $bHas = ($b['lead_author_university'] ?? '') !== '' || ($b['school_name'] ?? '') !== '';
                    if ($aHas !== $bHas) {
                        return $aHas ? -1 : 1;
                    }

                    return strcmp((string) ($a['lead_author_name'] ?? ''), (string) ($b['lead_author_name'] ?? ''));
                })
                ->values();
            $paginator->setCollection($sorted);
        }

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

    public function store(
        Request $request,
        CrawlSourceResolver $resolver,
        CrawlJobRunnerService $runner,
    ): JsonResponse {
        $this->mergeNormalizedRequestUrl($request);

        $data = $request->validate([
            'target_type' => ['required', 'in:paper,industry_news,teacher'],
            'request_url' => ['required', 'url', 'max:512'],
            'params' => ['nullable', 'array'],
        ]);

        $params = $data['params'] ?? [];

        $source = $resolver->resolve($data['request_url'], $data['target_type']);
        if (! $source) {
            return $this->fail('无法识别该地址对应的采集源', 422);
        }

        $job = CrawlJob::query()->create([
            'target_type' => $data['target_type'],
            'request_url' => $data['request_url'],
            'platform_url' => $data['request_url'],
            'keyword' => (string) ($params['keyword'] ?? ''),
            'params' => $params,
            'crawl_source_id' => $source->id,
            'adapter_code' => $source->adapter_code,
            'admin_user_id' => $request->user()?->id,
            'status' => 'pending',
        ]);

        try {
            $job = $runner->run($job, $source, $params);
        } catch (\Throwable $e) {
            $job->update([
                'status' => 'failed',
                'result_summary' => '抓取失败：'.$e->getMessage(),
                'completed_at' => now(),
            ]);

            return $this->fail('抓取任务失败：'.$e->getMessage(), 500, ['id' => $job->id]);
        }

        return $this->ok($this->serializeJob($job->fresh(['crawlSource'])), '抓取完成，请预览并勾选入库');
    }

    public function import(Request $request, int $crawlJob, CrawlImportService $importService): JsonResponse
    {
        $job = CrawlJob::query()->findOrFail($crawlJob);
        $data = $request->validate([
            'item_ids' => ['nullable', 'array'],
            'item_ids.*' => ['integer'],
            'select_all' => ['nullable', 'boolean'],
            'teacher_defaults' => ['nullable', 'array'],
            'teacher_defaults.university_id' => ['nullable', 'integer', 'exists:universities,id'],
            'teacher_defaults.city' => ['nullable', 'string', 'max:64'],
            'teacher_defaults.research_direction_ids' => ['nullable', 'array'],
            'teacher_defaults.research_direction_ids.*' => ['integer', 'exists:research_directions,id'],
            'news_defaults' => ['nullable', 'array'],
            'news_defaults.source' => ['nullable', 'string', 'max:128'],
            'news_defaults.category_dict_item_id' => ['nullable', 'integer'],
        ]);

        $result = $importService->import(
            $job,
            $data['item_ids'] ?? null,
            (bool) ($data['select_all'] ?? false),
            $data['teacher_defaults'] ?? [],
            $data['news_defaults'] ?? [],
        );

        return $this->ok([
            'imported' => $result['imported'],
            'skipped' => $result['skipped'],
            'failed' => $result['failed'],
            'items_imported' => $job->fresh()->items_imported,
        ], "已入库 {$result['imported']} 条");
    }

    public function updateItem(Request $request, int $crawlJob, int $item): JsonResponse
    {
        CrawlJob::query()->findOrFail($crawlJob);
        $row = CrawlJobItem::query()
            ->where('crawl_job_id', $crawlJob)
            ->where('target_type', 'news')
            ->findOrFail($item);

        $typeId = DictType::query()->where('code', 'news_category')->where('status', 1)->value('id');
        if (! $typeId) {
            return $this->fail('资讯分类字典未配置', 422);
        }

        $data = $request->validate([
            'category_dict_item_id' => [
                'nullable',
                'integer',
                \Illuminate\Validation\Rule::exists('dict_items', 'id')->where(
                    fn ($q) => $q->where('dict_type_id', $typeId)->where('status', 1)
                ),
            ],
            'import_source' => ['nullable', 'string', 'max:128'],
        ]);

        $payload = $row->payload ?? [];
        $extra = $payload['extra'] ?? [];

        if (array_key_exists('category_dict_item_id', $data) && $data['category_dict_item_id']) {
            $dictItem = DictItem::query()->findOrFail($data['category_dict_item_id']);
            $extra['category_dict_item_id'] = (int) $dictItem->id;
            $extra['category_label'] = $dictItem->label;
        }

        if (array_key_exists('import_source', $data)) {
            $extra['import_source'] = trim((string) $data['import_source']);
        }

        $payload['extra'] = $extra;
        $row->update(['payload' => $payload]);

        return $this->ok($this->serializeItem($row->fresh()), '已更新');
    }

    /**
     * @return array<string, mixed>
     */
    protected function serializeJob(CrawlJob $job): array
    {
        $previewCount = CrawlJobItem::query()
            ->where('crawl_job_id', $job->id)
            ->where('status', 'preview')
            ->count();

        $previewPaperCount = CrawlJobItem::query()
            ->where('crawl_job_id', $job->id)
            ->where('target_type', 'paper')
            ->where('status', 'preview')
            ->count();

        $previewTeacherLeadCount = CrawlJobItem::query()
            ->where('crawl_job_id', $job->id)
            ->where('target_type', 'teacher_lead')
            ->where('status', 'preview')
            ->count();

        $previewTeacherCount = CrawlJobItem::query()
            ->where('crawl_job_id', $job->id)
            ->where('target_type', 'teacher')
            ->where('status', 'preview')
            ->count();

        return [
            'id' => $job->id,
            'target_type' => $job->target_type,
            'request_url' => $job->request_url ?? $job->platform_url,
            'platform_url' => $job->platform_url,
            'keyword' => $job->keyword,
            'params' => $job->params,
            'status' => $job->status,
            'source_name' => $job->crawlSource?->name,
            'adapter_code' => $job->adapter_code,
            'items_fetched' => $job->items_fetched ?? $job->papers_created,
            'items_imported' => $job->items_imported ?? 0,
            'papers_created' => $job->papers_created,
            'preview_count' => $previewCount,
            'preview_paper_count' => $previewPaperCount,
            'preview_teacher_lead_count' => $previewTeacherLeadCount,
            'preview_teacher_count' => $previewTeacherCount,
            'result_summary' => $job->result_summary,
            'completed_at' => $job->completed_at?->toIso8601String(),
        ];
    }

    /**
     * @return array<string, mixed>
     */
    protected function serializeItem(CrawlJobItem $item): array
    {
        $payload = $item->payload ?? [];

        $lead = $payload['lead_author'] ?? null;

        return [
            'id' => $item->id,
            'external_id' => $item->external_id,
            'title' => $item->title,
            'authors' => $payload['authors'] ?? null,
            'school_name' => $payload['school_name'] ?? ($lead['university_name'] ?? null),
            'published_at' => $this->formatPublishedAt($payload['published_at'] ?? null),
            'lead_author_name' => is_array($lead) ? ($lead['name'] ?? null) : null,
            'lead_author_email' => is_array($lead) ? ($lead['email'] ?? null) : null,
            'lead_author_affiliation' => is_array($lead)
                ? ($lead['college'] ?? $lead['affiliation'] ?? $payload['college_name'] ?? null)
                : ($payload['college_name'] ?? null),
            'lead_author_university' => is_array($lead) ? ($lead['university_name'] ?? null) : null,
            'lead_author_academic_title' => is_array($lead)
                ? ($lead['academic_title'] ?? $payload['academic_title'] ?? null)
                : ($payload['academic_title'] ?? null),
            'paper_title' => $payload['paper_title'] ?? null,
            'paper_external_id' => $payload['paper_external_id'] ?? null,
            'url' => $item->canonical_url,
            'summary' => $payload['summary'] ?? null,
            'content_html' => $payload['content_html'] ?? null,
            'section' => $payload['section'] ?? null,
            'category_dict_item_id' => isset(($payload['extra'] ?? [])['category_dict_item_id'])
                ? (int) ($payload['extra']['category_dict_item_id'])
                : null,
            'category_label' => ($payload['extra'] ?? [])['category_label'] ?? null,
            'import_source' => ($payload['extra'] ?? [])['import_source'] ?? null,
            'status' => $item->status,
            'target_type' => $item->target_type,
            'source_name' => $item->source_name,
            'selectable' => $item->status === 'preview',
            'is_duplicate' => $item->status === 'duplicate',
        ];
    }

    protected function formatPublishedAt(mixed $value): ?string
    {
        if (! $value) {
            return null;
        }

        $str = (string) $value;
        if (preg_match('/^\d{4}-\d{2}-\d{2}/', $str, $m)) {
            return substr($m[0], 0, 10);
        }

        return $str;
    }

    /** 粘贴地址常缺协议，补全 https:// 以便通过 url 校验与域名匹配。 */
    protected function mergeNormalizedRequestUrl(Request $request): void
    {
        $raw = trim((string) $request->input('request_url', ''));
        if ($raw === '' || preg_match('#^https?://#i', $raw)) {
            return;
        }

        $request->merge(['request_url' => 'https://'.$raw]);
    }
}