<?php

namespace App\Http\Controllers;
use App\Models\Question;
use App\Models\Tag;
use App\Models\Category;

use Illuminate\Http\Request;

class QuestionController extends Controller
{
    /**
     * Display a listing of the resource.
     */
  public function index(Request $request)
    {
        $query = Question::with(['tags', 'category']);


         // تابع برای نرمال‌سازی رشته فارسی
    $normalize = function ($string) {
        // تبدیل نیم‌فاصله به فاصله معمولی
        $string = str_replace('‌', ' ', $string);
        // حذف فاصله‌های اضافی
        $string = preg_replace('/\s+/', ' ', $string);
        return trim($string);
    };


         if ($request->has('tag')) {
        $tag = $normalize($request->tag);
        $query->whereHas('tags', function ($q) use ($tag) {
            $q->whereRaw("REPLACE(name, '‌', ' ') LIKE ?", ["%{$tag}%"]);
        });
    }

    if ($request->has('category')) {
        $category = $normalize($request->category);
        $query->whereHas('category', function ($q) use ($category) {
            $q->whereRaw("REPLACE(name, '‌', ' ') LIKE ?", ["%{$category}%"]);
        });
    }

        return response()->json(
            $query->get()->map(fn ($q) => $this->formatQuestion($q))->values()
        );
    }

    /**
     * Shape a question into the legacy (old Flutter) response: category_id and
     * category are always present and non-null, tags is always an array, and
     * timestamps are always ISO strings — so the old client never hits a null.
     */
    private function formatQuestion(Question $question): array
    {
        $question->loadMissing(['tags', 'category']);

        $createdAt = optional($question->created_at)->toIso8601String();
        $updatedAt = optional($question->updated_at)->toIso8601String();
        $categoryId = $question->category_id ?? 0;

        $category = $question->category;
        $categoryPayload = $category
            ? [
                'id' => $category->id,
                'name' => $category->name ?? '',
                'created_at' => optional($category->created_at)->toIso8601String() ?? $createdAt,
                'updated_at' => optional($category->updated_at)->toIso8601String() ?? $updatedAt,
            ]
            : [
                'id' => $categoryId,
                'name' => '',
                'created_at' => $createdAt,
                'updated_at' => $updatedAt,
            ];

        return [
            'id' => $question->id,
            'title' => $question->title ?? '',
            'category_id' => $categoryId,
            'created_at' => $createdAt,
            'updated_at' => $updatedAt,
            'tags' => $question->tags->values(),
            'category' => $categoryPayload,
        ];
    }

    /**
     * Store a newly created resource in storage.
     */
   public function store(Request $request)
    {
        $data = $request->validate([
            'title' => 'required|string',
            'category' => 'nullable|string',
            'tags' => 'nullable|array',
            'tags.*' => 'string'
        ]);

        $category = null;
        if (!empty($data['category'])) {
            $category = Category::firstOrCreate(['name' => $data['category']]);
        }

        $question = Question::create([
            'title' => $data['title'],
            'category_id' => $category?->id
        ]);

        if (!empty($data['tags'])) {
            $tagIds = [];
            foreach ($data['tags'] as $tagName) {
                $tag = Tag::firstOrCreate(['name' => $tagName]);
                $tagIds[] = $tag->id;
            }
            $question->tags()->sync($tagIds);
        }

        return response()->json($this->formatQuestion($question), 201);
    }

    /**
     * Display the specified resource.
     */
    public function show(Question $question)
    {
        return response()->json($this->formatQuestion($question));
    }

    /**
     * Update the specified resource in storage.
     */
    public function update(Request $request, Question $question)
    {
        $data = $request->validate([
            'title' => 'sometimes|string',
            'category' => 'nullable|string',
            'tags' => 'nullable|array',
            'tags.*' => 'string'
        ]);

        if (isset($data['title'])) {
            $question->update(['title' => $data['title']]);
        }

        if (array_key_exists('category', $data)) {
            if ($data['category']) {
                $category = Category::firstOrCreate(['name' => $data['category']]);
                $question->update(['category_id' => $category->id]);
            } else {
                $question->update(['category_id' => null]);
            }
        }

        if (isset($data['tags'])) {
            $tagIds = [];
            foreach ($data['tags'] as $tagName) {
                $tag = Tag::firstOrCreate(['name' => $tagName]);
                $tagIds[] = $tag->id;
            }
            $question->tags()->sync($tagIds);
        }

        return response()->json($this->formatQuestion($question->fresh()));
    }

    /**
     * Remove the specified resource from storage.
     */
     public function destroy(Question $question)
    {
        $question->delete();
        return response()->json(['message' => 'سوال حذف شد']);
    }
}