<?php

namespace App\Services;

use App\Models\Entry;
use App\Models\User;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Session;

class TabulationService
{
    protected AuditionCacheService $auditionCacheService;

    protected EntryCacheService $entryCacheService;

    protected ScoreService $scoreService;

    /**
     * Create a new class instance.
     */
    public function __construct(
        AuditionCacheService $scoringGuideCacheService,
        ScoreService $scoreService,
        EntryCacheService $entryCacheService)
    {
        $this->auditionCacheService = $scoringGuideCacheService;
        $this->scoreService = $scoreService;
        $this->entryCacheService = $entryCacheService;
    }

    /**
     * Returns the rank of the entry in its audition
     *
     * @return mixed
     */
    public function entryRank(Entry $entry)
    {
        return $this->auditionEntries($entry->audition_id)[$entry->id]->rank;
    }

    /**
     * Returns a collection of entries including their calculated final_score_array and ranked
     * based upon their scores.
     *
     * @return \Illuminate\Support\Collection|mixed
     */
    public function auditionEntries(int $auditionId, $mode = 'seating')
    {
        static $cache = [];
        if (isset($cache[$auditionId])) {
            return $cache[$auditionId];
        }

        $audition = $this->auditionCacheService->getAudition($auditionId);
        $entries = $this->entryCacheService->getEntriesForAudition($auditionId, $mode);
        $this->scoreService->calculateScoresForAudition($auditionId);

        foreach ($entries as $entry) {
            $entry->final_score_array = $this->scoreService->entryTotalScores($entry);
            $entry->scoring_complete = ($this->scoreService->entryScoreSheetCounts()[$entry->id] == $audition->judges_count);
        }
        // Sort the array $entries by the first element in the final_score_array on each entry, then by the second element in that array continuing through each element in the final_score_array for each entry
        $entries = $entries->sort(function ($a, $b) {
            for ($i = 0; $i < count($a->final_score_array); $i++) {
                if ($a->final_score_array[$i] != $b->final_score_array[$i]) {
                    return $b->final_score_array[$i] > $a->final_score_array[$i] ? 1 : -1;
                }
            }

            return 0;
        });

        //TODO verify this actually sorts by subscores correctly
        $n = 1;
        /** @var Entry $entry */
        foreach ($entries as $entry) {
            if (! $entry->hasFlag('declined')) {
                $entry->rank = $n;
                $n++;
            } else {
                $entry->rank = $n.' - declined';
            }
        }
        $cache[$auditionId] = $entries->keyBy('id');

        return $entries->keyBy('id');
    }

    public function entryScoreSheetsAreValid(Entry $entry): bool
    {
        //TODO consider making this move the invalid score to another database for further investigation
        $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;
    }

    /**
     * Returns the number of un-scored entries for the audition with the given ID.
     *
     * @return mixed
     */
    public function remainingEntriesForAudition($auditionId, $mode = 'seating')
    {
        $audition = $this->getAuditionsWithStatus($mode)[$auditionId];

        switch ($mode) {
            case 'seating':
                return $audition->seating_entries_count - $audition->scored_entries_count;
            case 'advancement':
                return $audition->advancement_entries_count - $audition->scored_entries_count;
        }

        return $audition->entries_count - $audition->scored_entries_count;
    }

    /**
     * Get the array of all auditions from the cache. For each one, set a property
     * scored_entries_count that indicates the number of entries for that audition that
     * have a number of score sheets equal to the number of judges for that audition.
     *
     * @return mixed
     */
    public function getAuditionsWithStatus($mode = 'seating')
    {
        return Cache::remember('auditionsWithStatus', 30, function () use ($mode) {

            // Retrieve auditions from the cache and load entry IDs
            $auditions = $this->auditionCacheService->getAuditions($mode);
            // Iterate over the auditions and calculate the scored_entries_count
            foreach ($auditions as $audition) {
                $scored_entries_count = 0;
                $entries_to_check = $this->entryCacheService->getEntriesForAudition($audition->id);

                switch ($mode) {
                    case 'seating':
                        $entries_to_check = $entries_to_check->filter(function ($entry) {
                            return $entry->for_seating;
                        });
                        $auditions = $auditions->filter(function ($audition) {
                            return $audition->for_seating;
                        });
                        break;
                    case 'advancement':
                        $entries_to_check = $entries_to_check->filter(function ($entry) {
                            return $entry->for_advancement;
                        });
                        $auditions = $auditions->filter(function ($audition) {
                            return $audition->for_advancement;
                        });
                        break;
                }

                foreach ($entries_to_check as $entry) {
                    if ($this->scoreService->entryScoreSheetCounts()[$entry->id] - $audition->judges_count == 0) {
                        $scored_entries_count++;
                    }
                }

                $audition->scored_entries_count = $scored_entries_count;
            }


            return $auditions;

        });
    }
}