<?php

declare(strict_types=1);

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\HomeModule;
use App\Models\HomeModuleItem;
use Illuminate\Contracts\View\View;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Route as RouteFacade;
use Illuminate\Validation\Rule;

class SiteSettingController extends Controller
{
    public function index(): View
    {
        $this->ensureDefaultModules();

        $modules = HomeModule::query()
            ->withCount('items')
            ->orderBy('sort_order')
            ->orderBy('id')
            ->get();

        return view('admin.settings.index', [
            'modules' => $modules,
        ]);
    }

    public function show(HomeModule $module): View
    {
        $this->ensureDefaultModules();

        $module->load([
            'items' => fn ($query) => $query->orderBy('sort_order')->orderBy('id'),
        ]);

        return view('admin.settings.show', [
            'module' => $module,
            'moduleNav' => $this->moduleNavigation(),
            'routeOptions' => $this->routeOptions(),
        ]);
    }

    public function update(Request $request, HomeModule $module): RedirectResponse
    {
        $validated = $request->validate([
            'name' => ['required', 'string', 'max:120'],
            'title' => ['nullable', 'string', 'max:160'],
            'subtitle' => ['nullable', 'string', 'max:255'],
            'enabled' => ['nullable', 'boolean'],
            'sort_order' => ['nullable', 'integer', 'min:0', 'max:9999'],
            'limit' => ['nullable', 'integer', 'min:1', 'max:30'],
            'more_link_type' => ['nullable', Rule::in(['route', 'url'])],
            'more_link_target' => ['nullable', 'string', 'max:255'],
            'extra.side_title' => ['nullable', 'string', 'max:120'],
            'extra.side_subtitle' => ['nullable', 'string', 'max:255'],
        ]);

        $module->fill([
            'name' => $validated['name'],
            'title' => $validated['title'] ?? null,
            'subtitle' => $validated['subtitle'] ?? null,
            'enabled' => (bool) ($validated['enabled'] ?? false),
            'sort_order' => (int) ($validated['sort_order'] ?? $module->sort_order),
            'limit' => (int) ($validated['limit'] ?? $module->limit),
            'more_link_type' => $validated['more_link_type'] ?? null,
            'more_link_target' => $validated['more_link_target'] ?? null,
            'extra' => [
                'side_title' => data_get($validated, 'extra.side_title'),
                'side_subtitle' => data_get($validated, 'extra.side_subtitle'),
            ],
        ]);

        $this->validateModuleLink($module->module_key, $module->more_link_type, $module->more_link_target);
        $module->save();

        $this->clearHomeCaches();

        return redirect()
            ->route('admin.settings.show', $module)
            ->with('status', '模块配置已更新。');
    }

    public function storeItem(Request $request, HomeModule $module): RedirectResponse
    {
        $validated = $request->validate([
            'title' => ['nullable', 'string', 'max:160'],
            'subtitle' => ['nullable', 'string', 'max:255'],
            'image_path' => ['nullable', 'string', 'max:255'],
            'link_type' => ['required', Rule::in(['route', 'url'])],
            'link_target' => ['nullable', 'string', 'max:255'],
            'sort_order' => ['nullable', 'integer', 'min:0', 'max:9999'],
            'enabled' => ['nullable', 'boolean'],
        ]);

        $this->validateItemRules($module->module_key, $validated);
        $this->validateItemLink($module->module_key, $validated['link_type'], $validated['link_target'] ?? null);

        $module->items()->create([
            'title' => $validated['title'] ?? null,
            'subtitle' => $validated['subtitle'] ?? null,
            'image_path' => $validated['image_path'] ?? null,
            'link_type' => $validated['link_type'],
            'link_target' => $validated['link_target'] ?? null,
            'sort_order' => (int) ($validated['sort_order'] ?? (($module->items()->max('sort_order') ?? 0) + 10)),
            'enabled' => (bool) ($validated['enabled'] ?? true),
        ]);

        $this->clearHomeCaches();

        return redirect()
            ->route('admin.settings.show', $module)
            ->with('status', '模块条目已新增。');
    }

    public function editItem(HomeModule $module, HomeModuleItem $item): View
    {
        if ($item->home_module_id !== $module->id) {
            abort(404);
        }

        return view('admin.settings.item-form', [
            'module' => $module,
            'item' => $item,
            'moduleNav' => $this->moduleNavigation(),
            'routeOptions' => $this->routeOptions(),
        ]);
    }

    public function updateItem(Request $request, HomeModule $module, HomeModuleItem $item): RedirectResponse
    {
        if ($item->home_module_id !== $module->id) {
            abort(404);
        }

        $validated = $request->validate([
            'title' => ['nullable', 'string', 'max:160'],
            'subtitle' => ['nullable', 'string', 'max:255'],
            'image_path' => ['nullable', 'string', 'max:255'],
            'link_type' => ['required', Rule::in(['route', 'url'])],
            'link_target' => ['nullable', 'string', 'max:255'],
            'sort_order' => ['nullable', 'integer', 'min:0', 'max:9999'],
            'enabled' => ['nullable', 'boolean'],
        ]);

        $this->validateItemRules($module->module_key, $validated);
        $this->validateItemLink($module->module_key, $validated['link_type'], $validated['link_target'] ?? null);

        $item->fill([
            'title' => $validated['title'] ?? null,
            'subtitle' => $validated['subtitle'] ?? null,
            'image_path' => $validated['image_path'] ?? null,
            'link_type' => $validated['link_type'],
            'link_target' => $validated['link_target'] ?? null,
            'sort_order' => (int) ($validated['sort_order'] ?? $item->sort_order),
            'enabled' => (bool) ($validated['enabled'] ?? false),
        ])->save();

        $this->clearHomeCaches();

        return redirect()
            ->route('admin.settings.show', $module)
            ->with('status', '模块条目已更新。');
    }

    public function destroyItem(HomeModule $module, HomeModuleItem $item): RedirectResponse
    {
        if ($item->home_module_id !== $module->id) {
            abort(404);
        }

        $item->delete();
        $this->clearHomeCaches();

        return redirect()
            ->route('admin.settings.show', $module)
            ->with('status', '模块条目已删除。');
    }

    /**
     * @return array<int, array{name:string,value:string}>
     */
    private function routeOptions(): array
    {
        $allRouteNames = collect(RouteFacade::getRoutes()->getRoutesByName())
            ->filter(function ($route, $name): bool {
                if (!is_string($name) || $name === '') {
                    return false;
                }

                if (! method_exists($route, 'parameterNames')) {
                    return false;
                }

                return count($route->parameterNames()) === 0;
            })
            ->keys()
            ->map(fn ($name) => (string) $name)
            ->filter(fn (string $name) => ! str_starts_with($name, 'admin.'))
            ->filter(fn (string $name) => ! str_starts_with($name, 'debugbar.'))
            ->filter(fn (string $name) => ! str_starts_with($name, 'ignition.'))
            ->filter(fn (string $name) => ! str_starts_with($name, '_'))
            ->values();

        $priority = [
            'home',
            'tools.index',
            'tools.list',
            'models.index',
            'news.index',
            'guides.index',
        ];

        $priorityRoutes = collect($priority)
            ->filter(fn (string $name) => $allRouteNames->contains($name));

        $remainingRoutes = $allRouteNames
            ->reject(fn (string $name) => in_array($name, $priority, true))
            ->sort()
            ->values();

        return $priorityRoutes
            ->concat($remainingRoutes)
            ->map(fn (string $name) => [
                'name' => $this->routeLabel($name),
                'value' => $name,
            ])
            ->values()
            ->all();
    }

    private function routeLabel(string $name): string
    {
        return match ($name) {
            'home' => '首页',
            'tools.index' => '工具首页',
            'tools.list' => '工具列表',
            'models.index' => '模型推荐',
            'news.index' => '文章资讯',
            'guides.index' => '教程学习',
            default => $name,
        };
    }

    private function moduleNavigation()
    {
        return HomeModule::query()
            ->orderBy('sort_order')
            ->orderBy('id')
            ->get(['id', 'name', 'module_key']);
    }

    private function ensureDefaultModules(): void
    {
        $defaults = [
            ['key' => 'channel_cards', 'name' => '频道卡片', 'title' => '频道入口', 'sort' => 20, 'limit' => 5],
            ['key' => 'promo_banners', 'name' => '横幅推荐', 'title' => '横幅推荐', 'sort' => 30, 'limit' => 2],
            ['key' => 'hot_tools', 'name' => '热门工具', 'title' => '热门工具', 'sort' => 40, 'limit' => 18],
            ['key' => 'latest_tools', 'name' => '最新收录', 'title' => '最新收录', 'sort' => 50, 'limit' => 18],
            ['key' => 'category_sections', 'name' => '分类分块', 'title' => '分类分块', 'sort' => 60, 'limit' => 18],
        ];

        foreach ($defaults as $default) {
            HomeModule::query()->firstOrCreate([
                'module_key' => $default['key'],
            ], [
                'name' => $default['name'],
                'title' => $default['title'],
                'enabled' => true,
                'sort_order' => $default['sort'],
                'limit' => $default['limit'],
            ]);
        }
    }

    private function validateModuleLink(string $moduleKey, ?string $type, ?string $target): void
    {
        if (!in_array($moduleKey, ['hot_tools', 'latest_tools', 'category_sections'], true)) {
            return;
        }

        $target = trim((string) $target);

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

        if ($type === 'route') {
            if ($target === '') {
                abort(422, '请选择有效的“更多链接”路由。');
            }

            if (! in_array($target, array_column($this->routeOptions(), 'value'), true)) {
                abort(422, '模块“更多链接”路由不在允许范围内。');
            }

            return;
        }

        if ($type === 'url' && $target !== '' && ! $this->isValidUrlOrPath($target)) {
            abort(422, '模块“更多链接”URL格式不正确。');
        }
    }

    private function validateItemRules(string $moduleKey, array $item): void
    {
        if (! in_array($moduleKey, ['channel_cards', 'promo_banners'], true)) {
            return;
        }

        $title = trim((string) ($item['title'] ?? ''));
        $imagePath = trim((string) ($item['image_path'] ?? ''));
        $linkTarget = trim((string) ($item['link_target'] ?? ''));

        if ($title === '' || $imagePath === '' || $linkTarget === '') {
            abort(422, '频道卡片/横幅推荐条目必须填写标题、图片、链接。');
        }
    }

    private function validateItemLink(string $moduleKey, string $type, ?string $target): void
    {
        $target = trim((string) $target);
        $isStrictModule = in_array($moduleKey, ['channel_cards', 'promo_banners'], true);

        if ($type === 'route') {
            if ($target === '') {
                if ($isStrictModule) {
                    abort(422, '频道卡片/横幅推荐条目必须填写链接目标。');
                }

                return;
            }

            if (! in_array($target, array_column($this->routeOptions(), 'value'), true)) {
                abort(422, '请选择有效的前台路由，或将链接类型改为 URL。');
            }

            return;
        }

        if ($target === '') {
            if ($isStrictModule) {
                abort(422, '频道卡片/横幅推荐条目必须填写链接目标。');
            }

            return;
        }

        if (! $this->isValidUrlOrPath($target)) {
            abort(422, '条目URL格式不正确。');
        }
    }

    private function isValidUrlOrPath(string $value): bool
    {
        if (str_starts_with($value, '/')) {
            return true;
        }

        return (bool) filter_var($value, FILTER_VALIDATE_URL);
    }

    private function clearHomeCaches(): void
    {
        Cache::flush();
    }
}