<?php

namespace App\Http\Controllers;

use App\Http\Controllers\Controller;
use App\Http\Requests\QuestionExport;
use App\Http\Requests\Questions\StoreQuestionRequest;
use App\Http\Requests\Questions\UpdateQuestionRequest;
use App\Models\Brand;
use App\Models\Question;
use Carbon\Carbon;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Str;
use League\Csv\Writer;
use Symfony\Component\HttpFoundation\StreamedResponse;

class QuestionController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @param \Illuminate\Http\Request $request
     * @return \Illuminate\Contracts\View\View
     */
    public function index(Request $request): \Illuminate\Contracts\View\View
    {
        /** @var \Illuminate\Database\Eloquent\Builder $query */
        $query = Question::query();

        if ($request->brand) {
            $query = $query->where('brand_id', '=', $request->brand);
        }
        if ($request->search) {
            $this->searchQuery(
                $query,
                $request->search,
                null,
                'question',
            );
        }

        $this->sortQuery($query);
        $searchFields = trans('Question');

        /** @var \Illuminate\Pagination\AbstractPaginator */
        $questionModels = $query->paginate(12);

        return view('questions.index', compact('questionModels', 'searchFields'));
    }

    /**
     * Show the form for creating a new resource.
     *
     * @param \App\Models\Question $question
     * @return \Illuminate\Contracts\View\View
     */
    public function create(Question $question): \Illuminate\Contracts\View\View
    {
        $brandModels = Brand::all();

        return view('questions.create', [
            'questionModel' => $question,
            'brandModels' => $brandModels
        ]);
    }

    /**
     * Store a newly created resource in storage.
     *
     * @param \App\Http\Requests\Questions\StoreQuestionRequest $request
     * @return \Illuminate\Http\RedirectResponse
     */
    public function store(StoreQuestionRequest $request): \Illuminate\Http\RedirectResponse
    {
        return DB::transaction(function () use ($request) {
            $question = new Question();
            $question->fill($request->validated());
            if ($question->saveOrFail()) {
                return redirect()
                    ->route('questions.edit', $question)
                    ->with('success', trans(
                        ':model a été créé.',
                        ['model' => Str::singular(trans('models.classes.questions'))]
                    ));
            }
            return redirect()
                ->back()
                ->with('error', trans(
                    ':model n\'a pas été créé.',
                    ['model' => Str::singular(trans('models.classes.questions'))]
                ));
        });
    }

    /**
     * Show the form for editing the specified resource.
     *
     * @param \App\Models\Question $question
     * @return \Illuminate\Contracts\View\View
     */
    public function edit(Question $question): \Illuminate\Contracts\View\View
    {
        $brandModels = Brand::all();

        return view('questions.edit', [
            'questionModel' => $question,
            'brandModels' => $brandModels
        ]);
    }

    /**
     * Update a spacific resource in storage.
     *
     * @param \App\Http\Requests\Questions\UpdateQuestionRequest $request
     * @param \App\Models\Question                               $question
     * @return \Illuminate\Http\RedirectResponse
     */
    public function update(UpdateQuestionRequest $request, Question $question): \Illuminate\Http\RedirectResponse
    {
        return DB::transaction(function () use ($request, $question) {
            $question->fill($request->validated());
            if ($question->saveOrFail()) {
                return redirect()
                    ->route('questions.edit', $question)
                    ->with('success', trans(
                        ':model a été mis à jour.',
                        ['model' => Str::singular(trans('models.classes.questions'))]
                    ));
            }
            return redirect()
                ->back()
                ->with('error', trans(
                    ':model n\'a pas été mis à jour.',
                    ['model' => Str::singular(trans('models.classes.questions'))]
                ));
        });
    }

    /**
     * Show the specified resource.
     *
     * @param \App\Models\Question $question
     * @return \Illuminate\Contracts\View\View
     */
    public function show(Question $question): \Illuminate\Contracts\View\View
    {
        return view('questions.show', [
            'questionModel' => $question
        ]);
    }

    /**
     * Remove the specified resource from storage.
     *
     * @param \App\Models\Question $question
     * @return \Illuminate\Http\RedirectResponse
     */
    public function destroy(Question $question): \Illuminate\Http\RedirectResponse
    {
        if ($question->deleteOrFail()) {
            return redirect()->route('questions.index')
                ->with('success', trans(
                    ':model a été supprimé.',
                    ['model' => Str::singular(trans('models.classes.questions'))]
                ));
        }
        return redirect()->back()
            ->with('error', trans(
                ':model n\'a pas pu être supprimé.',
                ['model' => Str::singular(trans('models.classes.questions'))]
            ));
    }

    /**
     * Shows the question export form
     *
     * @return \Illuminate\Contracts\View\View
     */
    public function export(): \Illuminate\Contracts\View\View
    {
        $brands = Brand::all();
        return view('questions.export', compact('brands'));
    }

    /**
     * Exports questions as csv the requested export type
     *
     * @param \App\Http\Requests\QuestionExport $request
     * @return \Symfony\Component\HttpFoundation\StreamedResponse
     */
    public function exportSubmit(QuestionExport $request): \Symfony\Component\HttpFoundation\StreamedResponse
    {
        $results = [];
        /** @var \App\Models\Brand $brand */
        $brand     = Brand::query()->where('id', $request->brand)->firstOrFail();
        $questions = $brand->questions->load('answers');

        foreach ($questions as $question) {
            $answersCounts = DB::query()
                ->selectRaw('count(*) as total, answer_id')
                ->from('customer_answer')
                ->whereIn('answer_id', $question->answers->pluck('id'))
                ->groupBy('answer_id')
                ->get()->keyBy('answer_id');

            $results[$question->id] = [
                'question' => $question->question,
                'answers' => []
            ];
            foreach ($question->answers as $answer) {
                $results[$question->id]['answers'][] =
                    [
                        "$answer->answer ",
                        $answersCounts[$answer->id]->total ?? 0
                    ];
            }
        }

        $w = Writer::createFromString('');
        $w->setDelimiter(';');
        $w->setEnclosure('"');
        $w->setOutputBOM(Writer::BOM_UTF8);

        // * We send the CSV using Symfony StreamedResponse.
        $response = new StreamedResponse();
        $response->headers->set('Content-Encoding', 'none');
        $response->headers->set('Content-Type', 'text/csv; charset=UTF-8');
        $response->headers->set('Description', 'File Transfer');
        $response->headers->set(
            'Content-Disposition',
            sprintf(
                'attachment; filename="Export pour newsletter %s %s.csv"',
                Carbon::now()->isoFormat('DD-MM-YYYY_HH-mm'),
                Str::slug($brand->name)
            )
        );

        foreach ($results as $result) {
            $w->insertOne([
                'question' => $result['question'],
            ]);
            foreach ($result['answers'] as $answer) {
                $w->insertOne($answer);
            }
            $w->insertOne([]);
        }

        // * Push empty line if nothing to export
        if (empty($results)) {
            $w->insertOne([
                'Aucune question pour cette marque'
            ]);
        }

        /*
            We create a callable to output the CSV in chunk
            with Symfony StreamResponse you can flush the body content if necessary
            see Symfony documentation for more information
        */

        // * The flush value should depend on your CSV size.
        $flush_threshold = 1000;

        $response->setCallback(function () use ($w, $flush_threshold) {
            foreach ($w->chunk(1024) as $offset => $chunk) {
                echo $chunk;
                if ($offset % $flush_threshold === 0) {
                    flush();
                }
            }
        });
        return $response;
    }
}