<?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\HomeModule;
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);

        $payload = Cache::remember("tools_portal_v3_home_{$querySignature}", now()->addMinutes(10), function () use ($request, $activeTab): array {
            $builder = Tool::query()
                ->published()
                ->with('category');

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

            $categories = 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();

            $portalTools = $builder->limit(360)->get();
            $toolsByCategory = $portalTools->groupBy(fn (Tool $tool): string => $tool->category?->slug ?? 'uncategorized');

            $modules = $this->loadHomeModules();
            $moduleMap = collect($modules)->keyBy('module_key');

            $hotToolsLimit = (int) data_get($moduleMap, 'hot_tools.limit', 18);
            $latestToolsLimit = (int) data_get($moduleMap, 'latest_tools.limit', 18);
            $sectionLimit = (int) data_get($moduleMap, 'category_sections.limit', 18);

            $categorySections = $categories->map(function (Category $category) use ($toolsByCategory, $sectionLimit): array {
                $sectionTools = $toolsByCategory->get($category->slug, collect())->take($sectionLimit);

                return [
                    'slug' => $category->slug,
                    'name' => $category->name,
                    'count' => (int) ($category->published_tools_count ?? 0),
                    'tools' => $sectionTools,
                ];
            })->values();

            return [
                'categories' => $categories,
                'categorySections' => $categorySections,
                'hotTools' => $portalTools->take($hotToolsLimit),
                'latestTools' => Tool::query()->published()->with('category')->latest('published_at')->limit($latestToolsLimit)->get(),
                'filters' => $request->only(['q', 'pricing', 'api', 'tab']),
                'activeTab' => $activeTab,
                'tabOptions' => $this->tabOptions(),
                'toolStats' => $this->buildToolStats(),
                'modules' => $moduleMap,
            ];
        });

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

    public function list(Request $request): View
    {
        $activeTab = $this->resolveTab($request);

        $builder = Tool::query()
            ->published()
            ->with('category');

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

        $categories = 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();

        return view('public.tools.list', [
            'items' => $builder->paginate(36)->withQueryString(),
            'categories' => $categories,
            'filters' => $request->only(['q', 'category', 'pricing', 'api', 'tab']),
            'activeTab' => $activeTab,
            'tabOptions' => $this->tabOptions(),
            'toolStats' => $this->buildToolStats(),
            'sidebarModels' => AiModel::query()->published()->orderByDesc('total_score')->limit(8)->get(),
            'sidebarNews' => Article::query()->published()->latest('published_at')->limit(8)->get(),
        ]);
    }

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

        return $this->list($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, bool $withCategory): void
    {
        if ($request->filled('q')) {
            $keyword = trim((string) $request->string('q'));
            $builder->whereFullText(['name', 'summary', 'description'], $keyword);
        }

        if ($withCategory && $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'));
        }
    }

    /**
     * @return array{total:int, api:int, free:int, updated_7d:int}
     */
    private function buildToolStats(): array
    {
        return [
            'total' => Tool::query()->published()->count(),
            'api' => Tool::query()->published()->where('has_api', true)->count(),
            'free' => Tool::query()->published()->whereIn('pricing_type', ['free', 'freemium'])->count(),
            'updated_7d' => Tool::query()->published()->where('updated_at', '>=', now()->subDays(7))->count(),
        ];
    }

    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)));
    }

    /**
     * @return array<int, array<string, mixed>>
     */
    private function loadHomeModules(): array
    {
        $defaults = $this->defaultHomeModules();

        $records = HomeModule::query()
            ->with(['items' => fn ($query) => $query->where('enabled', true)->orderBy('sort_order')->orderBy('id')])
            ->orderBy('sort_order')
            ->orderBy('id')
            ->get();

        if ($records->isEmpty()) {
            return $defaults;
        }

        $filled = [];
        foreach ($records as $record) {
            $default = collect($defaults)->firstWhere('module_key', $record->module_key);
            if (!is_array($default)) {
                continue;
            }

            $items = $record->items->map(function ($item): array {
                return [
                    'id' => $item->id,
                    'title' => (string) ($item->title ?? ''),
                    'subtitle' => (string) ($item->subtitle ?? ''),
                    'image_path' => (string) ($item->image_path ?? ''),
                    'link_type' => (string) ($item->link_type ?? 'route'),
                    'link_target' => (string) ($item->link_target ?? ''),
                    'url' => $this->resolveLink((string) ($item->link_type ?? 'route'), (string) ($item->link_target ?? '')),
                ];
            })->values()->all();

            $filled[] = [
                'module_key' => $record->module_key,
                'name' => $record->name,
                'title' => $record->title ?: $default['title'],
                'subtitle' => $record->subtitle ?: $default['subtitle'],
                'enabled' => (bool) $record->enabled,
                'sort_order' => (int) $record->sort_order,
                'limit' => max(1, min(30, (int) $record->limit)),
                'more_link_type' => $record->more_link_type,
                'more_link_target' => $record->more_link_target,
                'more_url' => $this->resolveLink((string) $record->more_link_type, (string) $record->more_link_target),
                'extra' => is_array($record->extra) ? $record->extra : [],
                'items' => $items,
            ];
        }

        if ($filled === []) {
            return $defaults;
        }

        return $this->ensureModuleDefaults($filled, $defaults);
    }

    /**
     * @return array<int, array<string, mixed>>
     */
    private function defaultHomeModules(): array
    {
        return [
            [
                'module_key' => 'channel_cards',
                'name' => '频道卡片',
                'title' => '频道入口',
                'subtitle' => '模型、资讯、教程等入口合集',
                'enabled' => true,
                'sort_order' => 20,
                'limit' => 5,
                'more_link_type' => null,
                'more_link_target' => null,
                'more_url' => null,
                'extra' => [
                    'side_title' => '频道导航',
                    'side_subtitle' => '快速直达',
                ],
                'items' => [
                    [
                        'title' => '每日快讯',
                        'subtitle' => 'AI 资讯',
                        'image_path' => '',
                        'link_type' => 'route',
                        'link_target' => 'news.index',
                        'url' => route('news.index'),
                    ],
                    [
                        'title' => '最新模型',
                        'subtitle' => '模型推荐',
                        'image_path' => '',
                        'link_type' => 'route',
                        'link_target' => 'models.index',
                        'url' => route('models.index'),
                    ],
                    [
                        'title' => '热门教程',
                        'subtitle' => '教程学习',
                        'image_path' => '',
                        'link_type' => 'route',
                        'link_target' => 'guides.index',
                        'url' => route('guides.index'),
                    ],
                    [
                        'title' => '工具列表',
                        'subtitle' => '查看全部',
                        'image_path' => '',
                        'link_type' => 'route',
                        'link_target' => 'tools.list',
                        'url' => route('tools.list'),
                    ],
                ],
            ],
            [
                'module_key' => 'promo_banners',
                'name' => '横幅推荐',
                'title' => '精选推荐',
                'subtitle' => '运营位横幅可配置',
                'enabled' => true,
                'sort_order' => 30,
                'limit' => 2,
                'more_link_type' => null,
                'more_link_target' => null,
                'more_url' => null,
                'extra' => [],
                'items' => [
                    [
                        'title' => '超全图像视频模板一键复制',
                        'subtitle' => '全球顶尖模型',
                        'image_path' => '',
                        'link_type' => 'route',
                        'link_target' => 'tools.list',
                        'url' => route('tools.list'),
                    ],
                    [
                        'title' => '一站式 AI 创作平台',
                        'subtitle' => '免费试用',
                        'image_path' => '',
                        'link_type' => 'route',
                        'link_target' => 'tools.list',
                        'url' => route('tools.list'),
                    ],
                ],
            ],
            [
                'module_key' => 'hot_tools',
                'name' => '热门工具',
                'title' => '热门工具',
                'subtitle' => '根据推荐排序筛选',
                'enabled' => true,
                'sort_order' => 40,
                'limit' => 18,
                'more_link_type' => 'route',
                'more_link_target' => 'tools.list',
                'more_url' => route('tools.list', ['tab' => 'recommended']),
                'extra' => ['side_title' => '热门工具'],
                'items' => [],
            ],
            [
                'module_key' => 'latest_tools',
                'name' => '最新收录',
                'title' => '最新收录',
                'subtitle' => '按发布时间倒序',
                'enabled' => true,
                'sort_order' => 50,
                'limit' => 18,
                'more_link_type' => 'route',
                'more_link_target' => 'tools.list',
                'more_url' => route('tools.list', ['tab' => 'latest']),
                'extra' => ['side_title' => '最新收录'],
                'items' => [],
            ],
            [
                'module_key' => 'category_sections',
                'name' => '分类分块',
                'title' => '分类分块',
                'subtitle' => '按分类浏览工具',
                'enabled' => true,
                'sort_order' => 60,
                'limit' => 18,
                'more_link_type' => null,
                'more_link_target' => null,
                'more_url' => null,
                'extra' => ['side_title' => '分类导航'],
                'items' => [],
            ],
        ];
    }

    /**
     * @param array<int, array<string, mixed>> $loaded
     * @param array<int, array<string, mixed>> $defaults
     * @return array<int, array<string, mixed>>
     */
    private function ensureModuleDefaults(array $loaded, array $defaults): array
    {
        $loadedByKey = collect($loaded)->keyBy('module_key');
        $merged = [];

        foreach ($defaults as $default) {
            $existing = $loadedByKey->get($default['module_key']);
            if (!is_array($existing)) {
                $merged[] = $default;
                continue;
            }

            $merged[] = array_merge($default, $existing, [
                'items' => $existing['items'] ?? $default['items'],
                'extra' => array_merge($default['extra'] ?? [], $existing['extra'] ?? []),
            ]);
        }

        usort($merged, fn (array $a, array $b): int => (int) $a['sort_order'] <=> (int) $b['sort_order']);

        return $merged;
    }

    private function resolveLink(string $type, string $target): ?string
    {
        if ($type === 'route') {
            if ($target === '' || !\Illuminate\Support\Facades\Route::has($target)) {
                return null;
            }

            return route($target);
        }

        if ($target === '') {
            return null;
        }

        if (str_starts_with($target, '/')) {
            return $target;
        }

        return filter_var($target, FILTER_VALIDATE_URL) ? $target : null;
    }
}