xref: /webtrees/app/Age.php (revision 05babb969dd66fd95325613c7360d51ed3aa19fc) 
1<?php
2
3/**
4 * webtrees: online genealogy
5 * Copyright (C) 2021 webtrees development team
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <https://www.gnu.org/licenses/>.
16 */
17
18declare(strict_types=1);
19
20namespace Fisharebest\Webtrees;
21
22use function view;
23
24/**
25 * The difference between two GEDCOM dates.
26 */
27class Age
28{
29    private int $years;
30
31    private int $months;
32
33    private int $days;
34
35    private int $total_days;
36
37    private bool $is_exact;
38
39    private bool $is_valid;
40
41    /**
42     * Age constructor.
43     *
44     * @param Date $x - The first date
45     * @param Date $y - The second date
46     */
47    public function __construct(Date $x, Date $y)
48    {
49        // If the dates are ranges, use the start/end calendar dates.
50        $start = $x->minimumDate();
51        $end   = $y->maximumDate();
52
53        [$this->years, $this->months, $this->days] = $start->ageDifference($end);
54
55        $this->total_days = $end->minimumJulianDay() - $start->minimumJulianDay();
56
57        // Use the same precision as found in the dates.
58        if ($start->day() === 0 || $end->day() === 0) {
59            $this->days = 0;
60        }
61
62        if ($start->month() === 0 || $end->month() === 0) {
63            $this->months = 0;
64        }
65
66        // Are the dates exact?
67        $this->is_exact = $start->day() !== 0 && $end->day() !== 0;
68
69        // Are the dates valid?
70        $this->is_valid = $x->isOK() && $y->isOK();
71    }
72
73    /**
74     * Show an age in a human-friendly form, such as "34 years", "8 months", "20 days".
75     * Show an empty string for invalid/missing dates.
76     * Show a warning icon for negative ages.
77     * Show zero ages without any units.
78     *
79     * @return string
80     */
81    public function __toString(): string
82    {
83        if (!$this->is_valid) {
84            return '';
85        }
86
87        if ($this->years < 0) {
88            return view('icons/warning');
89        }
90
91        if ($this->years > 0) {
92            return I18N::plural('%s year', '%s years', $this->years, I18N::number($this->years));
93        }
94
95        if ($this->months > 0) {
96            return I18N::plural('%s month', '%s months', $this->months, I18N::number($this->months));
97        }
98
99        if ($this->days > 0 || $this->is_exact) {
100            return I18N::plural('%s day', '%s days', $this->days, I18N::number($this->days));
101        }
102
103        return I18N::number(0);
104    }
105
106    /**
107     * How many days between two events?
108     * If either date is invalid return -1.
109     *
110     * @return int
111     */
112    public function ageDays(): int
113    {
114        if ($this->is_valid) {
115            return $this->total_days;
116        }
117
118        return -1;
119    }
120
121    /**
122     * How many years between two events?
123     * Return -1 for invalid or reversed dates.
124     *
125     * @return int
126     */
127    public function ageYears(): int
128    {
129        if ($this->is_valid) {
130            return $this->years;
131        }
132
133        return -1;
134    }
135
136    /**
137     * How many years between two events?
138     * If either date is invalid return -1.
139     *
140     * @return string
141     */
142    public function ageYearsString(): string
143    {
144        if (!$this->is_valid) {
145            return '';
146        }
147
148        if ($this->years < 0) {
149            return view('icons/warning');
150        }
151
152
153        return I18N::number($this->years);
154    }
155}
156