<?php
/*
Second Assignment

Write a script, module, application or program in PHP, which upon execution accepts
two arguments.  One of those arguments should be a "total cost" (in dollars and/or cents)
and the other an "amount
provided" (also in dollars and/or cents).   Return as output the change that should be
provided, by returning the count of each denomination of bills and/or coins.  Extra
points for object oriented and/or advanced concepts.

*/

function makeChange($amount) {
    if ($amount >= 100) {
        $numBills = floor($amount / 100);
        echo "You get {$numBills} $100 bills.\n";
        $amountLeft = round($amount - ($numBills * 100), 2);
        if ($amountLeft > 0) {
            makeChange($amountLeft);
        }
    } elseif ($amount >= 50) {
        $numBills = floor($amount / 50);
        echo "You get {$numBills} $50 bills.\n";
        $amountLeft = round($amount - ($numBills * 50), 2);
        if ($amountLeft > 0) {
            makeChange($amountLeft);
        }
    } elseif ($amount >= 20) {
        $numBills = floor($amount / 20);
        echo "You get {$numBills} $20 bills.\n";
        $amountLeft = round($amount - ($numBills * 20), 2);
        if ($amountLeft > 0) {
            makeChange($amountLeft);
        }
    } elseif ($amount >= 10) {
        $numBills = floor($amount / 10);
        echo "You get {$numBills} $10 bills.\n";
        $amountLeft = round($amount - ($numBills * 10), 2);
        if ($amountLeft > 0) {
            makeChange($amountLeft);
        }
    } elseif ($amount >= 5) {
        $numBills = floor($amount / 5);
        echo "You get {$numBills} $5 bills.\n";
        $amountLeft = round($amount - ($numBills * 5), 2);
        if ($amountLeft > 0) {
            makeChange($amountLeft);
        }
    } elseif ($amount >= 1) {
        $numBills = floor($amount / 1);
        echo "You get {$numBills} $1 bills.\n";
        $amountLeft = round($amount - ($numBills * 1), 2);
        if ($amountLeft > 0) {
            makeChange($amountLeft);
        }
    } elseif ($amount >= .25) {
        $numBills = floor($amount / .25);
        echo "You get {$numBills} quarters.\n";
        $amountLeft = round($amount - ($numBills * .25), 2);
        if ($amountLeft > 0) {
            makeChange($amountLeft);
        }
    } elseif ($amount >= .10) {
        $numBills = floor($amount / .10);
        echo "You get {$numBills} dimes.\n";
        $amountLeft = round($amount - ($numBills * .10), 2);
        if ($amountLeft > 0) {
            makeChange($amountLeft);
        }
    } elseif ($amount >= .05) {
        $numBills = floor($amount / .05);
        echo "You get {$numBills} nickels.\n";
        $amountLeft = round($amount - ($numBills * .05), 2);
        if ($amountLeft > 0) {
            makeChange($amountLeft);
        }
    } elseif ($amount >= .01) {
        $numBills = floor($amount / .01);
        echo "You get {$numBills} pennies.\n";
        $amountLeft = round($amount - ($numBills * .01), 2);
        if ($amountLeft > 0) {
            makeChange($amountLeft);
        }
    }
}

$options = getopt("u:d:");

if (!isset($options['u']) || (isset($options['u']) && $options['u'] == '')) {
    die("Invalid Parameters: expecting '-u [total cost] -d [amount provided]'\n");
} else {
    $total = (float)$options['u'];
    if (!isset($options['d']) || (isset($options['d']) && $options['d'] == '')) {
        die("Invalid Parameters: expecting '-u [total cost] -d [amount provided]'\n");
    } else {
        $amountProvided = (float)$options['d'];
    }
}

if ($amountProvided < $total) {
    $change = $total - $amountProvided;
    echo "Not Enough Provided. You Still Need To Give \${$change}.\n";
} else if ($amountProvided == $total) {
    $change = 0;
    echo "No Change Is Required.\n";
} else {
    $change = round($amountProvided - $total, 2);
    echo "You Get \${$change} in change.\n";
    makeChange($change);
}