<?php

namespace App\Http\Controllers\NominationEnsembles;

use App\Http\Controllers\Controller;
use App\Models\NominationEnsemble;
use App\Models\NominationEnsembleEntry;
use App\Models\Student;
use Illuminate\Support\Carbon;

class MeobdaNominationEnsembleEntryController extends Controller implements NominationEnsembleEntryController
{
    public function index()
    {
        // Get current date for checking deadlines
        $currentDate = Carbon::now('America/Chicago');
        $currentDate = $currentDate->format('Y-m-d');

        $ensembles = NominationEnsemble::all();
        $availableInstruments = [];
        $availableStudents = [];
        $existingNominations = [];
        $nominationsAvailable = [];

        foreach ($ensembles as $ensemble) {
            // Get existing nominations
            $existingNominations[$ensemble->id] = auth()->user()->school->nominations()
                ->where('nomination_ensemble_id', $ensemble->id)
                ->get()
                ->keyBy('student_id');
            // Count how many nominations exist on each instrument
            $nominatedInstrumentCount = [];
            foreach ($existingNominations[$ensemble->id] as $nom) {
                $nominatedInstrumentCount[$nom->data['instrument']] =
                    ($nominatedInstrumentCount[$nom->data['instrument']] ?? 0) + 1;
            }

            // Set available instruments
            foreach ($ensemble->data['instruments'] as $instrument) {
                // Skip it if we're at the limit on this instrument
                if (! is_null($instrument['max']) && $instrument['max'] <= ($nominatedInstrumentCount[$instrument['name']] ?? 0)) {
                    continue;
                }
                $availableInstruments[$ensemble->id][] = $instrument['name'];
            }

            // Set available students
            $students = Student::where('school_id', auth()->user()->school_id)
                ->where('grade', '>=', $ensemble->minimum_grade)
                ->where('grade', '<=', $ensemble->maximum_grade)
                ->orderBy('last_name', 'asc')
                ->orderBy('first_name', 'asc')
                ->get();
            foreach ($existingNominations[$ensemble->id] as $checknom) {
                $students = $students->reject(function ($student) use ($checknom) {
                    return $checknom->student_id == $student->id;
                });
            }
            $availableStudents[$ensemble->id] = $students;
            $nominationsAvailable[$ensemble->id] = $existingNominations[$ensemble->id]->count() < $ensemble->data['max_nominations'];
        }

        return view('nomination_ensembles.meobda.entries.index',
            compact('ensembles', 'currentDate', 'availableInstruments', 'availableStudents', 'existingNominations',
                'nominationsAvailable'));
    }

    public function show(NominationEnsembleEntry $entry)
    {
        // TODO: Implement show() method.
    }

    public function create()
    {
        // TODO: Implement create() method.
    }

    public function store()
    {
        $validData = request()->validate([
            'ensemble' => [
                'required',
                'exists:App\Models\NominationEnsemble,id',
            ],
            'new_student' => [
                'required',
                'exists:App\Models\Student,id',
            ],
            'new_instrument' => 'required',
        ]);
        $ensemble = NominationEnsemble::find($validData['ensemble']);

        // Check that the deadline is not past
        $currentDate = Carbon::now('America/Chicago');
        $currentDate = $currentDate->format('Y-m-d');
        if ($ensemble->entry_deadline < $currentDate) {
            return redirect()->route('nomination.entry.index')->with('error',
                'The nomination deadline for that ensemble has passed');
        }

        // Check if new_instrument is valid
        foreach ($ensemble->data['instruments'] as $instrument) {
            $availableInstruments[] = $instrument['name'];
        }
        if (! in_array($validData['new_instrument'], $availableInstruments)) {
            return redirect()->route('nomination.entry.index')->with('error',
                'Invalid Instrument Specified');
        }

        // Check if the student belongs to the current user
        $student = Student::find($validData['new_student']);
        if (auth()->user()->school_id !== $student->school_id) {
            return redirect()->route('nomination.entry.index')->with('error',
                'You may only nominate students from your school');
        }

        // Check that the user's school has nominations available
        $existing_nominations = auth()->user()->school->nominations;
        if ($existing_nominations->count() >= $ensemble->data['max_nominations']) {
            return redirect()->route('nomination.entry.index')->with('error',
                'You have already used all of your nominations for this ensemble');
        }

        // Check that the user's school isn't over limit for the requested instrument
        $instrumentLimit = collect($ensemble->data['instruments'])->firstWhere('name',
            $validData['new_instrument'])['max'];
        if ($instrumentLimit) {
            $used = 0;
            foreach ($existing_nominations as $nom) {
                if ($nom->data['instrument'] == $validData['new_instrument']) {
                    $used++;
                }
                if ($used >= $instrumentLimit) {
                    return redirect()->route('nomination.entry.index')->with('error',
                        'You may not nominate any more students on that instrument');
                }
            }
        }

        // Check that the student isn't already nominated for this ensemble
        if (NominationEnsembleEntry::where('student_id', $validData['new_student'])
            ->where('nomination_ensemble_id', $validData['ensemble'])
            ->count() > 0) {
            return redirect()->route('nomination.entry.index')->with('error',
                'Student already nominated for that ensemble');
        }

        $newEntry = new NominationEnsembleEntry();
        $newEntry->student_id = $validData['new_student'];
        $newEntry->nomination_ensemble_id = $validData['ensemble'];
        $newEntry->data = ['instrument' => $validData['new_instrument']];
        $newEntry->save();

        return redirect()->route('nomination.entry.index')->with('success',
            'Nomination entered');
    }

    public function edit(NominationEnsembleEntry $entry)
    {
        // TODO: Implement edit() method.
    }

    public function update(NominationEnsembleEntry $entry)
    {
        // TODO: Implement update() method.
    }

    public function destroy(NominationEnsembleEntry $entry)
    {
        // TODO: Implement destroy() method.
    }
}