<?php

declare(strict_types=1);

namespace App\Http\Controllers\Site;

use App\Http\Controllers\Controller;
use App\Models\AiModel;
use App\Models\Article;
use App\Models\Category;
use App\Models\Tool;
use App\Support\MarkdownRenderer;
use Illuminate\Contracts\View\View;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Cache;

class ToolController extends Controller
{
    public function __construct(
        private readonly MarkdownRenderer $markdownRenderer,
    ) {
    }

    public function index(Request $request): View
    {
        $querySignature = sha1((string) $request->getQueryString());
        $activeTab = $this->resolveTab($request);

        $payload = Cache::remember("tools_index_v4_{$querySignature}", now()->addMinutes(10), function () use ($request, $activeTab): array {
            $builder = Tool::query()
                ->published()
                ->with(['category', 'alternative']);

            $this->applyFilters($builder, $request);
            $this->applyTabSorting($builder, $activeTab);

            $categoryNavigation = Category::query()
                ->where('type', 'tool')
                ->where('is_active', true)
                ->withCount([
                    'tools as published_tools_count' => fn (Builder $query): Builder => $query->published(),
                ])
                ->orderByDesc('published_tools_count')
                ->orderBy('name')
                ->get();

            $totalPublished = Tool::query()->published()->count();
            $totalApiSupported = Tool::query()->published()->where('has_api', true)->count();
            $totalFreeAvailable = Tool::query()->published()->whereIn('pricing_type', ['free', 'freemium'])->count();
            $updatedInSevenDays = Tool::query()->published()->where('updated_at', '>=', now()->subDays(7))->count();

            return [
                'items' => $builder->paginate(24)->withQueryString(),
                'categories' => $categoryNavigation,
                'filters' => $request->only(['q', 'category', 'pricing', 'api', 'tab']),
                'activeTab' => $activeTab,
                'tabOptions' => $this->tabOptions(),
                'toolStats' => [
                    'total' => $totalPublished,
                    'api' => $totalApiSupported,
                    'free' => $totalFreeAvailable,
                    'updated_7d' => $updatedInSevenDays,
                ],
                'featuredTools' => Tool::query()->published()->with('category')->orderByDesc('published_at')->limit(8)->get(),
                'sidebarModels' => AiModel::published()->orderByDesc('total_score')->limit(8)->get(),
                'sidebarNews' => Article::published()->latest('published_at')->limit(8)->get(),
            ];
        });

        return view('public.tools.index', $payload);
    }

    public function byCategory(string $slug, Request $request): View
    {
        $request->merge(['category' => $slug]);

        return $this->index($request);
    }

    public function show(string $slug): View
    {
        /** @var Tool $tool */
        $tool = Tool::query()
            ->published()
            ->with(['category', 'source', 'alternative'])
            ->where('slug', $slug)
            ->firstOrFail();

        $relatedTools = Tool::query()
            ->published()
            ->whereKeyNot($tool->id)
            ->when($tool->category_id !== null, fn (Builder $query): Builder => $query->where('category_id', $tool->category_id))
            ->orderByDesc('published_at')
            ->limit(8)
            ->get();

        $latestTools = Tool::query()
            ->published()
            ->whereKeyNot($tool->id)
            ->with('category')
            ->latest('published_at')
            ->limit(10)
            ->get();

        return view('public.tools.show', [
            'item' => $tool,
            'relatedTools' => $relatedTools,
            'latestTools' => $latestTools,
            'capabilityTags' => $this->extractCapabilityTags($tool),
            'descriptionHtml' => $this->markdownRenderer->render($tool->description),
            'showRiskNotice' => $this->containsRiskKeyword($tool->summary.' '.$tool->description),
        ]);
    }

    private function resolveTab(Request $request): string
    {
        $tab = (string) $request->string('tab');
        $allowedTabs = array_column($this->tabOptions(), 'key');

        return in_array($tab, $allowedTabs, true) ? $tab : 'recommended';
    }

    /**
     * @return array<int, array{key: string, label: string}>
     */
    private function tabOptions(): array
    {
        return [
            ['key' => 'recommended', 'label' => '综合推荐'],
            ['key' => 'latest', 'label' => '最新收录'],
            ['key' => 'api', 'label' => 'API 优先'],
            ['key' => 'free', 'label' => '免费优先'],
        ];
    }

    private function applyTabSorting(Builder $builder, string $activeTab): void
    {
        if ($activeTab === 'api') {
            $builder->where('has_api', true);
        }

        if ($activeTab === 'free') {
            $builder->whereIn('pricing_type', ['free', 'freemium']);
        }

        if ($activeTab === 'latest') {
            $builder->orderByDesc('published_at');

            return;
        }

        $builder
            ->orderBy('is_stale')
            ->orderByDesc('has_api')
            ->orderByDesc('published_at');
    }

    private function applyFilters(Builder $builder, Request $request): void
    {
        if ($request->filled('q')) {
            $keyword = trim((string) $request->string('q'));
            $builder->whereFullText(['name', 'summary', 'description'], $keyword);
        }

        if ($request->filled('category')) {
            $builder->whereHas('category', function (Builder $categoryQuery) use ($request): void {
                $categoryQuery->where('slug', (string) $request->string('category'));
            });
        }

        if ($request->filled('pricing')) {
            $builder->where('pricing_type', (string) $request->string('pricing'));
        }

        if ($request->filled('api')) {
            $builder->where('has_api', $request->boolean('api'));
        }
    }

    private function containsRiskKeyword(string $text): bool
    {
        return str_contains($text, '医疗')
            || str_contains($text, '法律')
            || str_contains($text, '投资')
            || str_contains($text, 'medical')
            || str_contains($text, 'legal')
            || str_contains($text, 'investment');
    }

    /**
     * @return array<int, string>
     */
    private function extractCapabilityTags(Tool $tool): array
    {
        $text = mb_strtolower($tool->name.' '.$tool->summary.' '.$tool->description);

        $tagMap = [
            '写作' => '内容写作',
            '文案' => '文案生成',
            '翻译' => '多语翻译',
            '图像' => '图像生成',
            '图片' => '图像处理',
            '视频' => '视频生成',
            '语音' => '语音处理',
            '音频' => '音频处理',
            '客服' => '智能客服',
            '代码' => '代码助手',
            '编程' => '开发辅助',
            '搜索' => '知识检索',
            '自动化' => '流程自动化',
            'agent' => 'Agent 工作流',
            'api' => '开放 API',
        ];

        $tags = [];
        foreach ($tagMap as $keyword => $label) {
            if (str_contains($text, $keyword)) {
                $tags[] = $label;
            }
        }

        if ($tool->has_api) {
            $tags[] = 'API 集成';
        }

        if ($tool->pricing_type === 'free') {
            $tags[] = '完全免费';
        }

        if ($tool->pricing_type === 'freemium') {
            $tags[] = '免费增值';
        }

        if ($tool->pricing_type === 'paid') {
            $tags[] = '商业付费';
        }

        if ($tool->category?->name !== null) {
            $tags[] = $tool->category->name;
        }

        return array_values(array_unique(array_slice($tags, 0, 8)));
    }
}