<?php

namespace App\Services;

use App\Exceptions\TabulationException;
use App\Models\Audition;
use App\Models\Entry;
use App\Models\ScoreSheet;
use App\Models\User;
use Illuminate\Support\Facades\Cache;
use App\Services\AuditionCacheService;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Session;


class TabulationService
{
    protected $cacheKey = 'entries';
    protected $auditionCacheService;
    /**
     * Create a new class instance.
     */
    public function __construct(AuditionCacheService $scoringGuideCacheService)
    {
        $this->auditionCacheService = $scoringGuideCacheService;
    }

    public function entryRank(Entry $entry) {
        return $this->auditionEntries($entry->audition_id)[$entry->id]->rank;
    }

    public function auditionEntries(Int $auditionId)
    {
        $cache_key = 'audition'.$auditionId.'entries';
        $audition = $this->auditionCacheService->getAudition($auditionId);

        return Cache::remember($cache_key, 5, function () use ($audition) {
            $entries = Entry::where('audition_id',$audition->id)->with(['student.school','scoreSheets'])->withCount('scoreSheets')->get();


            foreach ($entries as $entry) {
                $entry->final_score_array = $this->entryFinalScores($entry);
                $entry->scoring_complete = ($entry->score_sheets_count == $audition->judges_count) ? true:false;
            }

            // Sort based on final_score_array
            for ($n=0; $n <= $audition->judges_count; $n++) {
                $entries = $entries->sortByDesc(function ($entry) use ($n) {
                    return $entry['final_score_array'][$n];
                });
            }
            //TODO verify this actually sorts by subscores correcty
            $n = 1;
            foreach ($entries as $entry) {
                $entry->rank = $n;
                $n++;
            }
            return $entries->keyBy('id');
        });
    }

    /**
     * @throws TabulationException
     */
    public function entryFinalScores(Entry $entry) {
        $audition = $this->auditionCacheService->getAudition($entry->audition_id);
        if (! $this->entryScoreSheetsAreValid($entry)) return null;

        $subscores = $audition->scoringGuide->subscores->sortBy('tiebreak_order');
        $finalScoresArray = [];
        foreach($subscores as $subscore) {
            $finalScoresArray[$subscore->id] = 0;

        }

        foreach ($entry->scoreSheets as $sheet) {
            foreach ($sheet->subscores as $ss) {
                $finalScoresArray[$ss['subscore_id']] += $ss['score'];
            }
        }

        // calculate weighted final score
        $totalScore = 0;
        $totalWeight = 0;
        foreach ($subscores as $subscore) {
            $totalScore += ($finalScoresArray[$subscore->id] * $subscore->weight);
            $totalWeight += $subscore->weight;
        }
        $totalScore = ($totalScore / $totalWeight);
        array_unshift($finalScoresArray,$totalScore);
        return $finalScoresArray;
    }

    public function entryScoreSheetsAreValid(Entry $entry): bool {
        //TODO consider making this move the invalid score to another database for further investication
        $validJudges = $this->auditionCacheService->getAudition($entry->audition_id)->judges;
        foreach ($entry->scoreSheets as $sheet) {
            if (! $validJudges->contains($sheet->user_id)) {
                $invalidJudge = User::find($sheet->user_id);
                Session::flash('error','Invalid scores for entry ' . $entry->id . ' exist from ' . $invalidJudge->full_name());
                return false;
            }
        }
        return true;
    }

    public function remainingEntriesForAudition($auditionId)
    {
        $audition = $this->getAuditionsWithStatus()[$auditionId];
        return $audition->entries_count - $audition->scored_entries_count;
    }

    public function getAuditionsWithStatus()
    {
        return Cache::remember('auditionsWithStatus',30,function() {
            // Create an array with the number of scores for each entry
            $scoreCountByEntry = ScoreSheet::select('entry_id', DB::raw('count(*) as count'))
                ->groupBy('entry_id')
                ->get()
                ->pluck('count','entry_id');

            // Retrieve auditions from the cache and load entry IDs
            $auditions = $this->auditionCacheService->getAuditions();
            $auditions->load('entries');

            // Eager load the count of related models
            $auditions->loadCount(['judges', 'entries']);

            // Iterate over the auditions and calculate the scored_entries_count
            return $auditions->map(function ($audition) use ($scoreCountByEntry) {
                $audition->scored_entries_count = $audition->entries->reduce(function ($carry, $entry) use ($audition, $scoreCountByEntry) {
                    $entry->fully_scored = $audition->judges_count == $scoreCountByEntry->has($entry->id) ? $scoreCountByEntry[$entry->id] : false;
                    return $carry + ($entry->fully_scored ? 1 : 0);
                }, 0);
                return $audition;
            });
        });
    }

    public function allResults() {
        $auditions = $this->getAuditionsWithStatus();
        foreach ($auditions as $audition) {
            $audition->entries = $this->auditionEntries($audition->id);
        }
        return $auditions;
    }
}