<?php
// tes_cf.php

// Skala CF: 1-4 ke 0.25-1.0
$skala_cf = [
    1 => 0.25,
    2 => 0.50,
    3 => 0.75,
    4 => 1.00,
];

// Input contoh (cf_pakar, cf_user dalam skala 1-4)
$input = [
    ['cf_pakar' => 4, 'cf_user' => 3],
    ['cf_pakar' => 4, 'cf_user' => 2],
    ['cf_pakar' => 4, 'cf_user' => 3],
];

// Konversi ke nilai desimal dan hitung CF per gejala
$cf_per_gejala = [];
foreach ($input as $item) {
    $cf_pakar = $skala_cf[$item['cf_pakar']];
    $cf_user = $skala_cf[$item['cf_user']];
    $cf_per_gejala[] = $cf_pakar * $cf_user;
}

// Fungsi untuk gabung CF bertahap
function gabungCF(array $cf_array) {
    $cf_total = $cf_array[0];
    for ($i = 1; $i < count($cf_array); $i++) {
        $cf_total = $cf_total + $cf_array[$i] * (1 - $cf_total);
    }
    return $cf_total;
}

$cf_akhir = gabungCF($cf_per_gejala);

echo "=== Perhitungan Certainty Factor ===\n";
foreach ($input as $i => $item) {
    echo "Gejala " . ($i+1) . ": CF Pakar (" . $item['cf_pakar'] . " -> " . $skala_cf[$item['cf_pakar']] . "), ";
    echo "CF User (" . $item['cf_user'] . " -> " . $skala_cf[$item['cf_user']] . "), ";
    echo "CF Gejala = " . $cf_per_gejala[$i] . "\n";
}

echo "\nCF Total = " . round($cf_akhir * 100, 2) . "%\n";