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1<?php
2
3namespace Qmp\Laravel\ToolsLaravel\FileReader;
4
5use Closure;
6
7class FileReader
8{
9    protected $filename;
10
11    protected $size;
12
13    protected $nbLines;
14
15    protected $rows = [];
16
17    protected $capTo;
18
19    protected $totalToCap;
20
21    /**
22     * CsvReader constructor.
23     *
24     * @param $filename
25     * @param int $size
26     */
27    public function __construct($filename, $size = 4096)
28    {
29        $this->filename = $filename;
30        $this->size = $size;
31    }
32
33    /**
34     * @param null $nbLines
35     * @return array
36     */
37    public function rows($nbLines = null)
38    {
39        $this->nbLines = $nbLines;
40
41        $this->resetRows();
42        foreach ($this->generator() as $row) {
43            $this->rows[] = trim($row);
44        }
45
46        return $this->rows;
47    }
48
49    /**
50     * Undocumented function
51     *
52     * @param [type] $max
53     * @param [type] $total
54     * @return self
55     */
56    public function randomCapping($max, $total)
57    {
58        $this->capTo = $max;
59        $this->totalToCap = $total;
60
61        return $this;
62    }
63
64    /**
65     * Undocumented function
66     *
67     * @param Closure $func
68     * @param [type] $max
69     * @return void
70     */
71    public function each(Closure $func, $max = null, $params = null)
72    {
73        $this->nbLines = $max;
74
75        foreach ($this->generator() as $row) {
76            $func(str_replace(PHP_EOL, null, $row));
77        }
78    }
79
80    /**
81     * @return \Generator
82     */
83    protected function generator()
84    {
85        $handle = fopen($this->filename, 'r');
86
87        $row = 0;
88        while (!feof($handle)) {
89
90            if ($this->nbLines && $row == $this->nbLines || $this->capTo !== null && $this->capTo === 0) {
91                break;
92            }
93
94            $line = fgets($handle, $this->size);
95
96            if ($this->capTo !== null) {
97                if ($this->passCapping($row)) {
98                    yield $line;
99                }
100            } else {
101                yield $line;
102            }
103
104            $row++;
105        }
106
107        fclose($handle);
108    }
109
110    /**
111     * 
112     */
113    protected function passCapping($currentRowIndex)
114    {
115        $left = $this->totalToCap - $currentRowIndex;
116        $percent = $this->capTo * 100 / $left;
117        $rand = mt_rand(1, 100);
118
119        if ($rand <= $percent) {
120            $this->capTo--;
121            return true;
122        }
123        return false;
124    }
125
126    /**
127     *
128     */
129    protected function resetRows()
130    {
131        $this->rows = [];
132    }
133}