<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\DocumentCategory;
use Illuminate\Http\Request;
use Illuminate\Support\Str;

class DocumentCategoryController extends Controller
{
    /**
     * Display a listing of document categories
     */
    public function index()
    {
        $categories = DocumentCategory::withCount('activeDocuments')
            ->orderBy('sort_order')
            ->get();

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

    /**
     * Show the form for creating a new category
     */
    public function create()
    {
        return view('admin.document-categories.create');
    }

    /**
     * Store a newly created category
     */
    public function store(Request $request)
    {
        $validated = $request->validate([
            'name' => 'required|string|max:255',
            'slug' => 'nullable|string|max:255|unique:document_categories,slug',
            'description' => 'nullable|string',
            'icon' => 'nullable|string|max:10',
            'sort_order' => 'nullable|integer',
            'default_access_level' => 'required|in:public,members,admin,board',
        ]);

        // Auto-generate slug if not provided
        if (empty($validated['slug'])) {
            $validated['slug'] = Str::slug($validated['name']);
        }

        $category = DocumentCategory::create($validated);

        return redirect()
            ->route('admin.document-categories.index')
            ->with('status', '文件類別已成功建立');
    }

    /**
     * Show the form for editing a category
     */
    public function edit(DocumentCategory $documentCategory)
    {
        return view('admin.document-categories.edit', compact('documentCategory'));
    }

    /**
     * Update the specified category
     */
    public function update(Request $request, DocumentCategory $documentCategory)
    {
        $validated = $request->validate([
            'name' => 'required|string|max:255',
            'slug' => 'nullable|string|max:255|unique:document_categories,slug,' . $documentCategory->id,
            'description' => 'nullable|string',
            'icon' => 'nullable|string|max:10',
            'sort_order' => 'nullable|integer',
            'default_access_level' => 'required|in:public,members,admin,board',
        ]);

        $documentCategory->update($validated);

        return redirect()
            ->route('admin.document-categories.index')
            ->with('status', '文件類別已成功更新');
    }

    /**
     * Remove the specified category
     */
    public function destroy(DocumentCategory $documentCategory)
    {
        // Check if category has documents
        if ($documentCategory->documents()->count() > 0) {
            return back()->with('error', '此類別下有文件，無法刪除');
        }

        $documentCategory->delete();

        return redirect()
            ->route('admin.document-categories.index')
            ->with('status', '文件類別已成功刪除');
    }
}