<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\ArticleCategory;
use App\Models\AuditLog;
use Illuminate\Http\Request;

class ArticleCategoryController extends Controller
{
    public function __construct()
    {
        $this->middleware('can:view_articles');
    }

    public function index()
    {
        $categories = ArticleCategory::withCount('articles')
            ->orderBy('sort_order')
            ->get();

        return view('admin.article-categories.index', compact('categories'));
    }

    public function create()
    {
        return view('admin.article-categories.create');
    }

    public function store(Request $request)
    {
        $validated = $request->validate([
            'name' => 'required|string|max:255',
            'slug' => 'nullable|string|max:255|unique:article_categories,slug',
            'description' => 'nullable|string|max:1000',
            'sort_order' => 'nullable|integer',
        ]);

        $category = ArticleCategory::create([
            'name' => $validated['name'],
            'slug' => $validated['slug'] ?? null,
            'description' => $validated['description'] ?? null,
            'sort_order' => $validated['sort_order'] ?? 0,
        ]);

        AuditLog::create([
            'user_id' => auth()->id(),
            'action' => 'article_category.created',
            'description' => "建立文章分類：{$category->name}",
            'ip_address' => request()->ip(),
        ]);

        return redirect()
            ->route('admin.article-categories.index')
            ->with('status', '分類已成功建立');
    }

    public function edit(ArticleCategory $articleCategory)
    {
        return view('admin.article-categories.edit', ['category' => $articleCategory]);
    }

    public function update(Request $request, ArticleCategory $articleCategory)
    {
        $validated = $request->validate([
            'name' => 'required|string|max:255',
            'slug' => 'nullable|string|max:255|unique:article_categories,slug,'.$articleCategory->id,
            'description' => 'nullable|string|max:1000',
            'sort_order' => 'nullable|integer',
        ]);

        $articleCategory->update([
            'name' => $validated['name'],
            'slug' => $validated['slug'] ?? $articleCategory->slug,
            'description' => $validated['description'] ?? null,
            'sort_order' => $validated['sort_order'] ?? 0,
        ]);

        AuditLog::create([
            'user_id' => auth()->id(),
            'action' => 'article_category.updated',
            'description' => "更新文章分類：{$articleCategory->name}",
            'ip_address' => request()->ip(),
        ]);

        return redirect()
            ->route('admin.article-categories.index')
            ->with('status', '分類已成功更新');
    }

    public function destroy(ArticleCategory $articleCategory)
    {
        if ($articleCategory->articles()->count() > 0) {
            return back()->with('error', '此分類下仍有文章，無法刪除');
        }

        $name = $articleCategory->name;
        $articleCategory->delete();

        AuditLog::create([
            'user_id' => auth()->id(),
            'action' => 'article_category.deleted',
            'description' => "刪除文章分類：{$name}",
            'ip_address' => request()->ip(),
        ]);

        return redirect()
            ->route('admin.article-categories.index')
            ->with('status', '分類已成功刪除');
    }
}