<?php

namespace App\Http\Controllers;

use App\Models\AssignedTests;
use App\Models\MultipleChoiceAnswers;
use App\Models\Question;
use App\Models\SingleChoiceAnswer;
use App\Models\SingleQuestionAnswers;
use App\Models\Test;
use App\Models\TestQuestionResult;
use App\Models\TestResult;
use Illuminate\Http\Request;

class TestTakingController extends Controller
{
    /**
     * Display a listing of the resource.
     */
    public function index(Request $request)
    {
        $user = $request->user();

        $assigned_tests = [];
        foreach (AssignedTests::where("student_id", $user->id)->get() as $assigned_test) {
            if ($assigned_test->allowed) {
                array_push($assigned_tests, Test::where("id", $assigned_test->test_id)->first());
            }
        }

        return view("take_tests.index", [
            "assigned_tests" => $assigned_tests
        ]);
    }

    /**
     * Show the form for creating a new resource.
     */
    public function create()
    {
        //
    }

    /**
     * Store a newly created resource in storage.
     */
    public function store(Request $request)
    {
        $test_id = $request->test_id;
        $answers = $request->answer;
        $questions = Question::where("test_id", $test_id)->get();
        $total_points = 0;
        $max_points = 0;
        $question_results = [];

        foreach ($questions as $idx => $question) {
            $points = 0;
            $student_answer = "";
            if (!empty($answers[$idx])) {
                $student_answer = $answers[$idx];
                if ($question->answer_type == "single_answer") {
                    $answer = SingleQuestionAnswers::where("question_id", $question->id)->first();
                    if ($student_answer == $answer->answer) {
                        $points = $question->points;
                    }
                } else if ($question->answer_type == "single_choice") {
                    $answer = SingleChoiceAnswer::where("question_id", $question->id)->first();
                    if ($student_answer == $answer->correct_answer) {
                        $points = $question->points;
                    }
                } else if ($question["answer_type"] == "multiple_choice") {
                    $answer = MultipleChoiceAnswers::where("question_id", $question->id)->first();
                    $correct_answers = [];

                    if ($answer->is_answer1_correct) {
                        array_push($correct_answers, $answer->answer1);
                    }
                    if ($answer->is_answer2_correct) {
                        array_push($correct_answers, $answer->answer2);
                    }
                    if ($answer->is_answer3_correct) {
                        array_push($correct_answers, $answer->answer3);
                    }
                    if ($answer->is_answer4_correct) {
                        array_push($correct_answers, $answer->answer4);
                    }

                    $points = count(array_intersect($correct_answers, $student_answer)) / count($correct_answers);
                    $student_answer = join(", ", $student_answer);
                }
            }

            $max_points += $question->points;
            $total_points += $points;
            array_push($question_results, [
                "question_id" => $question->id,
                "points" => $points,
                "answer" => $student_answer
            ]);
        }

        $user = $request->user();

        $test_result = TestResult::create([
            "student_id" => $user->id,
            "test_id" => $test_id,
            "points" => $total_points,
            "max_points" => $max_points
        ]);

        foreach ($question_results as $question_result) {
            $question_result["test_results_id"] = $test_result->id;
            TestQuestionResult::create($question_result);
        }

        AssignedTests::where("test_id", $test_id)
            ->where("student_id", $user->id)
            ->update([ "allowed" => false ]);

        return view('dashboard');
    }

    /**
     * Display the specified resource.
     */
    public function show(Test $test)
    {
        //
    }

    /**
     * Show the form for editing the specified resource.
     */
    public function edit($test_id)
    {

        $question_answers = [];
        $questions = Question::where("test_id", $test_id)->get();
        foreach ($questions as $question) {
            $question_answer = $question->toArray();
            if ($question->answer_type == "single_answer") {
                $answer = SingleQuestionAnswers::where("question_id", $question->id)->first();
                $question_answer["answer"] = $answer->answer;
            } else if ($question->answer_type == "single_choice") {
                $answer = SingleChoiceAnswer::where("question_id", $question->id)->first();
                $question_answer["answers"] = [$answer->correct_answer, $answer->incorrect_answer1];
                if ($answer->incorrect_answer2) {
                    array_push($question_answer["answers"], $answer->incorrect_answer2);
                }
                if ($answer->incorrect_answer3) {
                    array_push($question_answer["answers"], $answer->incorrect_answer3);
                }
                shuffle($question_answer["answers"]);
            } else if ($question["answer_type"] == "multiple_choice") {
                $answer = MultipleChoiceAnswers::where("question_id", $question->id)->first();
                $question_answer["answers"] = [$answer->answer1, $answer->answer2];
                if ($answer->answer3) {
                    array_push($question_answer["answers"], $answer->answer3);
                }
                if ($answer->answer4) {
                    array_push($question_answer["answers"], $answer->answer4);
                }
                shuffle($question_answer["answers"]);
            }
            array_push($question_answers, $question_answer);
        }

        return view("take_tests.edit", [
            "test_id" => $test_id,
            "questions" => $question_answers
        ]);
    }

    /**
     * Update the specified resource in storage.
     */
    public function update(Request $request, Test $test)
    {
        //
    }

    /**
     * Remove the specified resource from storage.
     */
    public function destroy(Test $test)
    {
        //
    }
}