|
1
|
|
|
<?php |
|
2
|
|
|
/** |
|
3
|
|
|
* User: alec |
|
4
|
|
|
* Date: 27.11.18 |
|
5
|
|
|
* Time: 13:33 |
|
6
|
|
|
*/ |
|
7
|
|
|
|
|
8
|
|
|
namespace AlecRabbit\Money; |
|
9
|
|
|
|
|
10
|
|
|
use AlecRabbit\Money\Contracts\CalculatorInterface; |
|
11
|
|
|
|
|
12
|
|
|
class AllocationCalculator |
|
13
|
|
|
{ |
|
14
|
|
|
protected const PRECISION = 2; |
|
15
|
|
|
|
|
16
|
|
|
/** @var string */ |
|
17
|
|
|
protected $amount; |
|
18
|
|
|
|
|
19
|
|
|
/** @var Currency */ |
|
20
|
|
|
protected $currency; |
|
21
|
|
|
|
|
22
|
|
|
/** @var CalculatorInterface */ |
|
23
|
|
|
protected $calculator; |
|
24
|
|
|
|
|
25
|
|
|
/** @var array */ |
|
26
|
|
|
private $allocated = []; |
|
27
|
|
|
|
|
28
|
|
|
/** @var int */ |
|
29
|
|
|
private $allocations; |
|
30
|
|
|
|
|
31
|
|
|
/** @var string */ |
|
32
|
|
|
private $remainder; |
|
33
|
|
|
|
|
34
|
|
|
/** |
|
35
|
|
|
* AllocationCalculator constructor. |
|
36
|
|
|
* @param Money $param |
|
37
|
|
|
*/ |
|
38
|
37 |
|
public function __construct(Money $param) |
|
39
|
|
|
{ |
|
40
|
37 |
|
$this->amount = $param->getAmount(); |
|
41
|
37 |
|
$this->currency = $param->getCurrency(); |
|
42
|
37 |
|
$this->remainder = $this->amount; |
|
43
|
37 |
|
$this->calculator = CalculatorFactory::getCalculator(); |
|
44
|
37 |
|
} |
|
45
|
|
|
|
|
46
|
37 |
|
public function compute(array $ratios, ?int $precision): array |
|
47
|
|
|
{ |
|
48
|
37 |
|
$precision = $this->filterPrecision($precision); |
|
49
|
|
|
|
|
50
|
37 |
|
$this->allocate($ratios, $precision); |
|
51
|
|
|
|
|
52
|
34 |
|
$this->allocateRemainder($ratios); |
|
53
|
|
|
return |
|
54
|
34 |
|
$this->prepareInstances(); |
|
55
|
|
|
} |
|
56
|
|
|
|
|
57
|
|
|
/** |
|
58
|
|
|
* @param array $ratios |
|
59
|
|
|
*/ |
|
60
|
34 |
|
private function computeAllocations(array $ratios): void |
|
61
|
|
|
{ |
|
62
|
34 |
|
if (0 === $this->allocations = \count($ratios)) { |
|
63
|
|
|
throw new \InvalidArgumentException('Cannot allocate to none, ratios cannot be an empty array.'); |
|
64
|
|
|
} |
|
65
|
34 |
|
} |
|
66
|
|
|
|
|
67
|
|
|
/** |
|
68
|
|
|
* @param array $ratios |
|
69
|
|
|
* @return float|int |
|
70
|
|
|
*/ |
|
71
|
37 |
|
private function getTotal(array $ratios) |
|
72
|
|
|
{ |
|
73
|
37 |
|
if (0 >= $total = array_sum($ratios)) { |
|
74
|
2 |
|
throw new \InvalidArgumentException('Sum of ratios must be greater than zero.'); |
|
75
|
|
|
} |
|
76
|
35 |
|
return $total; |
|
77
|
|
|
} |
|
78
|
|
|
|
|
79
|
|
|
/** |
|
80
|
|
|
* @param $ratio |
|
81
|
|
|
*/ |
|
82
|
35 |
|
private function checkRatio($ratio): void |
|
83
|
|
|
{ |
|
84
|
35 |
|
if ($ratio < 0) { |
|
85
|
1 |
|
throw new \InvalidArgumentException('Ratio must be zero or positive.'); |
|
86
|
|
|
} |
|
87
|
35 |
|
} |
|
88
|
|
|
|
|
89
|
|
|
/** |
|
90
|
|
|
* @param array $ratios |
|
91
|
|
|
* @return array |
|
92
|
|
|
*/ |
|
93
|
34 |
|
private function allocateRemainder(array $ratios): array |
|
94
|
|
|
{ |
|
95
|
34 |
|
$this->computeAllocations($ratios); |
|
96
|
|
|
|
|
97
|
34 |
|
switch ($this->calculator->compare($this->remainder, '0')) { |
|
98
|
|
|
case -1: |
|
99
|
13 |
|
for ($i = $this->allocations - 1; $i >= 0; $i--) { |
|
100
|
13 |
|
if (!$ratios[$i]) { |
|
101
|
1 |
|
continue; |
|
102
|
|
|
} |
|
103
|
13 |
|
$this->allocated[$i] = $this->calculator->add($this->allocated[$i], $this->remainder); |
|
104
|
13 |
|
break; |
|
105
|
|
|
} |
|
106
|
13 |
|
break; |
|
107
|
21 |
|
case 1: |
|
108
|
7 |
|
for ($i = 0; $i < $this->allocations; $i++) { |
|
109
|
7 |
|
if (!$ratios[$i]) { |
|
110
|
1 |
|
continue; |
|
111
|
|
|
} |
|
112
|
7 |
|
$this->allocated[$i] = $this->calculator->add($this->allocated[$i], $this->remainder); |
|
113
|
7 |
|
break; |
|
114
|
|
|
} |
|
115
|
7 |
|
break; |
|
116
|
|
|
default: |
|
117
|
14 |
|
break; |
|
118
|
|
|
} |
|
119
|
34 |
|
return $this->allocated; |
|
120
|
|
|
} |
|
121
|
|
|
|
|
122
|
|
|
/** |
|
123
|
|
|
* @return array |
|
124
|
|
|
*/ |
|
125
|
34 |
|
private function prepareInstances(): array |
|
126
|
|
|
{ |
|
127
|
34 |
|
$computed = []; |
|
128
|
34 |
|
foreach ($this->allocated as $amount) { |
|
129
|
34 |
|
$computed[] = new Money($amount, $this->currency); |
|
130
|
|
|
} |
|
131
|
34 |
|
return $computed; |
|
132
|
|
|
} |
|
133
|
|
|
|
|
134
|
|
|
/** |
|
135
|
|
|
* @param array $ratios |
|
136
|
|
|
* @param int $precision |
|
137
|
|
|
*/ |
|
138
|
37 |
|
private function allocate(array $ratios, int $precision): void |
|
139
|
|
|
{ |
|
140
|
37 |
|
$total = $this->getTotal($ratios); |
|
141
|
35 |
|
foreach ($ratios as $ratio) { |
|
142
|
35 |
|
$this->checkRatio($ratio); |
|
143
|
|
|
|
|
144
|
35 |
|
$share = $this->calculator->share($this->amount, $ratio, $total, $precision); |
|
145
|
35 |
|
$this->allocated[] = $share; |
|
146
|
35 |
|
$this->remainder = $this->calculator->subtract($this->remainder, $share); |
|
147
|
|
|
} |
|
148
|
34 |
|
} |
|
149
|
|
|
|
|
150
|
|
|
/** |
|
151
|
|
|
* @param int|null $precision |
|
152
|
|
|
* @return int |
|
153
|
|
|
*/ |
|
154
|
37 |
|
private function filterPrecision(?int $precision): int |
|
155
|
|
|
{ |
|
156
|
37 |
|
$precision = $precision ?? self::PRECISION; |
|
157
|
37 |
|
return $precision; |
|
158
|
|
|
} |
|
159
|
|
|
} |
|
160
|
|
|
|
alecrabbit /
twrb-php-components
