From f2e50664301f5f7df2574ab50e5e676d4e3e0bb6 Mon Sep 17 00:00:00 2001
From: Eric Lippmann <eric.lippmann@netways.de>
Date: Fri, 10 Apr 2015 09:44:38 +0200
Subject: [PATCH] lib: Add DateFormatter for ICU date formatting

The DateFormatter class is supposed to handle locale-dependent date, time, and time diff (ago, since, until) formatting.

refs #6778
---
 library/Icinga/Date/DateFormatter.php | 226 ++++++++++++++++++++++++++
 1 file changed, 226 insertions(+)
 create mode 100644 library/Icinga/Date/DateFormatter.php

diff --git a/library/Icinga/Date/DateFormatter.php b/library/Icinga/Date/DateFormatter.php
new file mode 100644
index 000000000..79523d0a4
--- /dev/null
+++ b/library/Icinga/Date/DateFormatter.php
@@ -0,0 +1,226 @@
+<?php
+/* Icinga Web 2 | (c) 2013-2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Date;
+
+use IntlDateFormatter;
+use InvalidArgumentException;
+
+/**
+ * ICU date formatting
+ */
+class DateFormatter
+{
+    /**
+     * Internal constant for relative time diffs
+     *
+     * @var int
+     */
+    protected static $relative = 0;
+
+    /**
+     * Format time
+     *
+     * @var int
+     */
+    const TIME = 1;
+
+    /**
+     * Format date
+     *
+     * @var int
+     */
+    const DATE = 2;
+
+    /**
+     * Format date and time
+     *
+     * @var int
+     */
+    const DATETIME = 4;
+
+    /**
+     * Format time diff as time ago
+     *
+     * @var int
+     */
+    const AGO = 8;
+
+    /**
+     * Format time diff as time until
+     *
+     * @var int
+     */
+    const UNTIL = 16;
+
+    /**
+     * Format time diff as time since
+     *
+     * @var int
+     */
+    const SINCE = 32;
+
+    /**
+     * Format used for the DateFormatter
+     *
+     * @var int
+     */
+    protected $format;
+
+    /**
+     * Create a date formatter
+     *
+     * @param int $format
+     */
+    public function __construct($format)
+    {
+        $this->format = $format;
+    }
+
+    /**
+     * Create a date formatter
+     *
+     * @param   int $format
+     *
+     * @return  static
+     */
+    public static function create($format)
+    {
+        return new static($format);
+    }
+
+    /**
+     * Format the diff between two date/time values as a string
+     *
+     * @param   int|float   $time
+     * @param   int|float   $now
+     *
+     * @return  string              The formatted string
+     */
+    protected function diff($time, $now = null)
+    {
+        $now = $now === null ? time() : (float) $now;
+        $invert = false;
+        $diff = $time - $now;
+        if ($diff < 0) {
+            $diff = abs($diff);
+            $invert = true;
+        }
+        if ($diff > 3600 * 24 * 3) {
+            $type = static::DATETIME;
+            $fmt = new IntlDateFormatter(null, IntlDateFormatter::SHORT, IntlDateFormatter::SHORT);
+            $formatted = $fmt->format($time);
+        } else {
+            $minutes = floor($diff / 60);
+            if ($minutes < 60) {
+                $type = static::$relative;
+                $formatted = sprintf('%dm %ds', $minutes, $diff % 60);
+            } else {
+                $hours = floor($minutes / 60);
+                if ($hours < 24) {
+                    $type = static::TIME;
+                    $fmt = new IntlDateFormatter(null, IntlDateFormatter::NONE, IntlDateFormatter::SHORT);
+                    $formatted = $fmt->format($time);
+                } else {
+                    $type = static::$relative;
+                    $formatted = sprintf('%dd %dh', floor($hours / 24), $hours % 24);
+                }
+            }
+        }
+        switch ($this->format) {
+            case static::AGO:
+                switch ($type) {
+                    case static::$relative:
+                        $formatted = sprintf(
+                            t('%s ago', 'An event that happened the given time interval ago'),
+                            $formatted
+                        );
+                        break;
+                    case static::TIME:
+                        $formatted = sprintf(t('at %s', 'An event that happened at the given time'), $formatted);
+                        break;
+                    case static::DATETIME:
+                        $formatted = sprintf(
+                            t('on %s', 'An event that happened at the given date and time'),
+                            $formatted
+                        );
+                        break;
+                }
+                break;
+            case static::UNTIL:
+                switch ($type) {
+                    case static::$relative:
+                        $formatted = sprintf(
+                            t('in %s', 'An event will happen after the given time interval has elapsed'),
+                            $invert ? ('-' . $formatted) : $formatted
+                        );
+                        break;
+                    case static::TIME:
+                        $formatted = sprintf(t('at %s', 'An event will happen at the given time'), $formatted);
+                        break;
+                    case static::DATETIME:
+                        $formatted = sprintf(t('on %s', 'An event will happen on the given date and time'), $formatted);
+                        break;
+                }
+                break;
+            case static::SINCE;
+                switch ($type) {
+                    case static::$relative:
+                        $formatted = sprintf(
+                            t('for %s', 'A status is lasting for the given time interval'),
+                            $formatted
+                        );
+                        break;
+                    case static::TIME:
+                        // Move to next case
+                    case static::DATETIME:
+                        $formatted = sprintf(
+                            t('since %s', 'A status is lasting since the given date and time'),
+                            $formatted
+                        );
+                        break;
+                }
+                break;
+            default:
+                break;
+        }
+        return $formatted;
+    }
+
+    /**
+     * Format a date/time value as a string
+     *
+     * @param   int|float   $time   Date/time to format
+     * @param   int|float   $now
+     *
+     * @return  string              The formatted string
+     */
+    public function format($time, $now = null)
+    {
+        $time = (float) $time;
+        switch ($this->format) {
+            case static::TIME:
+                $fmt = new IntlDateFormatter(null, IntlDateFormatter::NONE, IntlDateFormatter::SHORT);
+                $formatted = $fmt->format($time);
+                break;
+            case static::DATE;
+                $fmt = new IntlDateFormatter(null, IntlDateFormatter::SHORT, IntlDateFormatter::NONE);
+                $formatted = $fmt->format($time);
+                break;
+            case static::DATETIME;
+                $fmt = new IntlDateFormatter(null, IntlDateFormatter::SHORT, IntlDateFormatter::SHORT);
+                $formatted = $fmt->format($time);
+                break;
+            case static::AGO:
+                // Move to next case
+            case static::UNTIL:
+                // Move to next case
+            case static::SINCE:
+                $formatted = $this->diff($time, $now);
+                break;
+            default:
+                throw new InvalidArgumentException('Invalid format');
+        }
+        return $formatted;
+    }
+}