<?php

namespace App\Http\Controllers;

use App\Models\Course;
use App\Models\Topic;
use Illuminate\Http\Request;
use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Validator;
use Illuminate\Support\Str;


class TopicController extends Controller
{
    public function createTopic(Request $request)
    {
        $validation = Validator::make($request->all(), [
            'name' => 'required|unique:topics,name',
            'description' => 'required',
            'category_id' => 'required|exists:categories,id',
        ]);
        if($validation->fails()) {
            return response(['errors' => $validation->errors()->all()], 422);
        }


        $topics = Topic::create([
            'name' => $request->name,
            'description' => $request->description,
            'category_id' => $request->category_id,
            'slug' => Str::slug($request->name),
        ]);
        Cache::forget('topics');

        return response(['message' => 'Topic added successfully'], 200);
    }

    public function getTopic($id)
    {
        $topic = Topic::find($id);
        return response(['data' => $topic], 200);
    }

    function findTopicbySlug($slug)
    {
        $topic = Topic::where('slug', $slug)->first();
        if(!$topic) {
            return response([
                'message' => 'No topic was found for this slug',
            ], 400);
        }
        return response([
            'data' => $topic,
        ], 200);
    }

    public function getTopics()
    {
        $topics = Topic::with(['category:id,name'])->orderBy('id', 'desc')->get();
        foreach($topics as $key => $topic) {
            $topics[$key]['total_courses'] = Course::where('topic_id', $topic->id)->count();
        }

        return response(['data' => $topics], 200);
    }

    public function getTopicsByCategory($cat_id)
    {
        $topics = Topic::where('category_id', $cat_id)->get();
        return response(['data' => $topics], 200);

    }

    public function updateTopic(Request $request, $id)
    {
        $validation = Validator::make($request->all(), [
            'name' => 'required|unique:topics,name',
            'description' => 'required',
            'category_id' => 'required|exists:categories,id',
        ]);
        if($validation->fails()) {
            return response(['errors' => $validation->errors()->all()], 422);
        }
        Topic::where('id', $id)->update([
            'slug' => Str::slug($request->name),
            'name' => $request->name,
            'description' => $request->description,
            'category_id' => $request->category_id,
        ]);
        return response(['message' => 'Topic has been updated successfully',], 200);

    }

    public function groupTopicsByCategoryId()
    {

        if(Cache::has('topics')) {
            $cache = Cache::get('topics');
            return response(content: ['data' => $cache], status: 200);
        }

        $topics = Topic::get()->groupBy(fn($data) => $data->category_id);
        $expiry = now()->addWeek();
        Cache::put('topics', $topics, $expiry);
        return response(['data' => $topics], 200);

    }


}