<?php

namespace App\Support\Enrollment;

final class DeliberationDecision
{
    public const PASSED = 'PASSED';
    public const REPEAT_CLASS = 'REPEAT_CLASS';
    public const MAKE_UP_EXAM = 'MAKE_UP_EXAM';
    public const EXPELLED = 'EXPELLED';
    public const WITHDRAWN = 'WITHDRAWN';
    public const DEFERRED_DECISION = 'DEFERRED_DECISION';

    public const ALL = [
        self::PASSED,
        self::REPEAT_CLASS,
        self::MAKE_UP_EXAM,
        self::EXPELLED,
        self::WITHDRAWN,
        self::DEFERRED_DECISION,
    ];

    public static function normalize(?string $decision): ?string
    {
        $value = trim((string) $decision);
        if ($value === '') {
            return null;
        }

        $key = strtoupper((string) preg_replace('/[^A-Z0-9]+/', '_', $value));
        $key = trim((string) preg_replace('/_+/', '_', $key), '_');

        if (in_array($key, self::ALL, true)) {
            return $key;
        }

        $compact = strtolower((string) preg_replace('/[^a-z0-9]+/', '', strtolower($value)));

        return match (true) {
            in_array($compact, ['pass', 'passed', 'promote', 'promoted'], true) => self::PASSED,
            str_contains($compact, 'repeat') || str_contains($compact, 'keepkg') => self::REPEAT_CLASS,
            str_contains($compact, 'makeupexam') || str_contains($compact, 'makeupexamfall') || str_contains($compact, 'makeup') => self::MAKE_UP_EXAM,
            str_contains($compact, 'deferred') || str_contains($compact, 'pendingdecision') => self::DEFERRED_DECISION,
            str_contains($compact, 'withdraw') || str_contains($compact, 'widthrwan') => self::WITHDRAWN,
            str_contains($compact, 'expel') => self::EXPELLED,
            default => null,
        };
    }

    public static function display(?string $decision): string
    {
        return match (self::normalize($decision) ?? $decision) {
            self::PASSED => 'Passed',
            self::REPEAT_CLASS => 'Repeat Class',
            self::MAKE_UP_EXAM => 'Make-up Exam',
            self::EXPELLED => 'Expelled',
            self::WITHDRAWN => 'Withdrawn',
            self::DEFERRED_DECISION => 'Deferred Decision',
            default => trim((string) $decision),
        };
    }

    public static function blocksEnrollment(?string $decision): bool
    {
        return in_array(self::normalize($decision), [
            self::EXPELLED,
            self::WITHDRAWN,
            self::DEFERRED_DECISION,
        ], true);
    }
}