<?php

namespace App\Http\Controllers\Api\V2;

use App\Http\Controllers\Controller;
use App\Http\Requests\Api\V2\GetBrandStatsRequest;
use App\Http\Requests\Api\V2\GetQuestionStatsRequest;
use App\Http\Resources\Api\V2\BrandStatsResource;
use App\Http\Resources\Api\V2\QuestionStatsResource;
use App\Models\BrandStat;
use App\Models\ModelAnswer;
use App\Models\Question;
use App\Models\Service;
use Illuminate\Support\Carbon;
use Illuminate\Support\Collection;

class StatsController extends Controller
{
    /**
     * Get specific brand statistics.
     *
     * @param \App\Http\Requests\Api\V2\GetBrandStatsRequest $request
     * @param \App\Models\Service                            $service
     * @return \Illuminate\Http\Resources\Json\ResourceCollection
     */
    public function brandStats(
        GetBrandStatsRequest $request,
        Service $service
    ): \Illuminate\Http\Resources\Json\ResourceCollection {
        $stats = BrandStat::query()->whereDate('created_at', '>=', $request->start)
            ->whereDate('created_at', '<=', $request->end)
            ->whereBrandId($service->brand->id)->get();
        return new BrandStatsResource($stats);
    }

    /**
     * Get statistics for a specific question.
     *
     * @param \App\Http\Requests\Api\V2\GetQuestionStatsRequest $request
     * @param \App\Models\Question                              $question
     * @return \App\Http\Resources\Api\V2\QuestionStatsResource
     */
    public function questionStats(
        GetQuestionStatsRequest $request,
        Question $question
    ): \App\Http\Resources\Api\V2\QuestionStatsResource {
        // * Make sure we are accessing a customer that belongs to our service.
        $this->authorize('questionBelongsToService', $question);

        $answers = $question->answers;
        $start   = Carbon::parse($request->start);
        $end     = Carbon::parse($request->end);

        return new QuestionStatsResource(
            $this->answersByDays($answers, $start, $end),
            $question
        );
    }

    /**
     * Total réponses par dates.
     *
     * @param \Illuminate\Support\Collection $answers
     * @param \Illuminate\Support\Carbon     $start
     * @param \Illuminate\Support\Carbon     $end
     * @return \Illuminate\Support\Collection
     */
    private function answersByDays(Collection $answers, Carbon $start, Carbon $end): \Illuminate\Support\Collection
    {
        // * Totalize by date all answers.
        $answersByDays = ModelAnswer::query()
            ->whereDate('created_at', '>=', $start)
            ->whereDate('created_at', '<=', $end)
            ->whereIn('answer_id', $answers->pluck('id'))
            ->get()
            ->map(function ($custAnswer) {
                return [
                    'answer_id'  => $custAnswer->answer_id,
                    'created_at' => $custAnswer->created_at->isoFormat('YYYY-MM-DD'),
                ];
            })
            ->groupBy(['created_at', 'answer_id'])
            ->map(function ($day) {
                return $day->map(function ($custAnswers) {
                    return $custAnswers->count();
                });
            });

        do {
            $currentDate = $start->isoFormat('YYYY-MM-DD');
            /** @var \Illuminate\Support\Collection $answersByDays */
            if (!$answersByDays->has($currentDate)) {
                $answersByDays->put(
                    $currentDate,
                    $answers->mapWithKeys(function ($answer) {
                        return [$answer->id => 0];
                    })
                );
            } else {
                $curentAnswers = $answersByDays->pull($currentDate);
                $answersByDays->put(
                    $currentDate,
                    $answers->mapWithKeys(function ($answer) use ($curentAnswers) {
                        return [$answer->id =>
                        $curentAnswers->has($answer->id) ?
                            $curentAnswers->get($answer->id) : 0];
                    })
                );
            }

            $start = $start->addDay();
        } while ($start->lessThanOrEqualTo($end));

        return $answersByDays;
    }
}