Support complex calculation.

Signed-off-by: Mior Muhammad Zaki <crynobone@gmail.com>
katsana · Oct 18, 2019 · cfd2337 · cfd2337
1 parent 9477e03
commit cfd2337
Show file tree

Hide file tree

Showing 5 changed files with 187 additions and 52 deletions.
diff --git a/src/Distance.php b/src/Distance.php
@@ -4,23 +4,52 @@
 
 use InvalidArgumentException;
 
-class Distance
+class Distance extends Metric
 {
     /**
-     * Speed value in METER.
+     * List of supported formats.
      *
-     * @var int
+     * @var array
      */
-    protected $value;
+    protected $supportedFormats = [
+        'm' => [
+            'from' => 1,
+            'to' => 1,
+        ],
+        'km' => [
+            'from' => 0.001,
+            'to' => 1000.0,
+        ],
+        'mi' => [
+            'from' => 0.000621371,
+            'to' => 1609.34,
+        ],
+    ];
 
     /**
      * Construct a new Speed from METER.
      *
-     * @param int $value
+     * @param float $value
      */
-    public function __construct(int $value)
+    public function __construct(float $value, string $format = 'm')
     {
-        $this->value = $value;
+        $value = \is_numeric($value) ? $value : 0;
+
+        $this->format = $format;
+        $this->value = $this->convertTo($value, $format, 'to');
+    }
+
+    /**
+     * Convert to Speed with new format.
+     *
+     * @param  string $format
+     * @return static
+     */
+    public function to(string $format = 'km')
+    {
+        return new static(
+            $this->convertTo($this->value, $format, 'from'), $format
+        );
     }
 
     /**
@@ -32,15 +61,8 @@ public function __construct(int $value)
      */
     public function humanize(string $format = 'km'): float
     {
-        $value = \is_numeric($this->value) ? $this->value : 0;
-
-        switch ($format) {
-            case 'km':
-                return \round($value * 0.001, 2);
-            case 'mi':
-                return \round($value * 0.000621371, 2);
-            default:
-                throw new InvalidArgumentException("Unvalid given {$format} format.");
-        }
+        return \round(
+            $this->convertTo($this->value, $format, 'from'), 2
+        );
     }
 }
diff --git a/src/Metric.php b/src/Metric.php
@@ -0,0 +1,74 @@
+<?php
+
+namespace Katsana\Metric;
+
+abstract class Metric
+{
+    /**
+     * Value.
+     *
+     * @var float|int
+     */
+    protected $value;
+
+    /**
+     * Value format.
+     *
+     * @var string
+     */
+    protected $format;
+
+    /**
+     * List of supported formats.
+     *
+     * @var array
+     */
+    protected $supportedFormats = [];
+
+    /**
+     * Format as string.
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        return \number_format($this->humanize($this->format), 0, '.', ',');
+    }
+
+    /**
+     * Convert to new format.
+     *
+     * @param  string $format
+     * @return static
+     */
+    abstract public function to(string $format);
+
+    /**
+     * Convert to humanize.
+     *
+     * @param  string $format
+     * @return float|int
+     *
+     * @throws \InvalidArgumentException
+     */
+    abstract public function humanize(string $format);
+
+    /**
+     * Convert value to.
+     *
+     * @param  float|int $value
+     * @param  string $format
+     * @param  string $type
+     * @return float|int
+     */
+    protected function convertTo($value, string $format, string $type = 'from')
+    {
+        if (! \array_key_exists($format, $this->supportedFormats)) {
+            throw new InvalidArgumentException("Unvalid use unsupported {$format} format.");
+        }
+
+        $conversion = $this->supportedFormats[$format];
+
+        return ($value * $conversion[$type]);
+    }
+}
diff --git a/src/Speed.php b/src/Speed.php
@@ -4,23 +4,53 @@
 
 use InvalidArgumentException;
 
-class Speed
+class Speed extends Metric
 {
     /**
-     * Speed value in KNOT.
+     * List of supported formats.
      *
-     * @var float
+     * @var array
      */
-    protected $value;
+    protected $supportedFormats = [
+        'kn' => [
+            'from' => 1,
+            'to' => 1,
+        ],
+        'kmh' => [
+            'from' => 1.85200,
+            'to' => 0.539957,
+        ],
+        'mph' => [
+            'from' => 1.15078,
+            'to' => 0.868976,
+        ],
+    ];
 
     /**
-     * Construct a new Speed from KNOT.
+     * Construct a new Speed.
      *
      * @param float $value
+     * @param string $format
      */
-    public function __construct(float $value)
+    public function __construct(float $value, string $format = 'kn')
     {
-        $this->value = $value;
+        $value = \is_numeric($value) ? $value : 0;
+
+        $this->format = $format;
+        $this->value = $this->convertTo($value, $format, 'to');
+    }
+
+    /**
+     * Convert to Speed with new format.
+     *
+     * @param  string $format
+     * @return static
+     */
+    public function to(string $format = 'kmh')
+    {
+        return new static(
+            $this->convertTo($this->value, $format, 'from'), $format
+        );
     }
 
     /**
@@ -32,15 +62,8 @@ public function __construct(float $value)
      */
     public function humanize(string $format = 'kmh'): float
     {
-        $value = \is_numeric($this->value) ? $this->value : 0;
-
-        switch ($format) {
-            case 'kmh':
-                return \round($value * 1.85200, 2);
-            case 'mph':
-                return \round($value * 1.15078, 2);
-            default:
-                throw new InvalidArgumentException("Unvalid given {$format} format.");
-        }
+        return \round(
+            $this->convertTo($this->value, $format, 'from'), 2
+        );
     }
 }
diff --git a/tests/DistanceTest.php b/tests/DistanceTest.php
@@ -7,18 +7,22 @@
 
 class DistanceTest extends TestCase
 {
+    /** @test */
+    public function it_can_display_formatted_distance()
+    {
+        $this->assertSame('60', (string) (new Distance(60000))->to('km'));
+        $this->assertSame('7', (string) (new Distance(6812))->to('km'));
+        $this->assertSame('0', (string) (new Distance(12))->to('km'));
+        $this->assertSame('0', (string) (new Distance(0))->to('km'));
+    }
+
     /** @test */
     public function it_can_convert_distance_from_meter_to_km()
     {
         $this->assertSame(60.0, (new Distance(60000))->humanize());
         $this->assertSame(6.81, (new Distance(6812))->humanize());
         $this->assertSame(0.01, (new Distance(12))->humanize());
         $this->assertSame(0.0, (new Distance(0))->humanize());
-
-        $this->assertSame(60.0, (new Distance('60000'))->humanize());
-        $this->assertSame(6.81, (new Distance('6812'))->humanize());
-        $this->assertSame(0.01, (new Distance('12'))->humanize());
-        $this->assertSame(0.0, (new Distance('0'))->humanize());
     }
 
     /** @test */
@@ -28,10 +32,14 @@ public function it_can_convert_distance_from_meter_to_miles()
         $this->assertSame(4.23, (new Distance(6812))->humanize('mi'));
         $this->assertSame(0.01, (new Distance(12))->humanize('mi'));
         $this->assertSame(0.0, (new Distance(0))->humanize('mi'));
+    }
 
-        $this->assertSame(37.28, (new Distance('60000'))->humanize('mi'));
-        $this->assertSame(4.23, (new Distance('6812'))->humanize('mi'));
-        $this->assertSame(0.01, (new Distance('12'))->humanize('mi'));
-        $this->assertSame(0.0, (new Distance('0'))->humanize('mi'));
+    /** @test */
+    public function it_can_convert_distance_from_meter_to_miles_via_km()
+    {
+        $this->assertSame(37.28, (new Distance(60000))->to('km')->humanize('mi'));
+        $this->assertSame(4.23, (new Distance(6812))->to('km')->humanize('mi'));
+        $this->assertSame(0.01, (new Distance(12))->to('km')->humanize('mi'));
+        $this->assertSame(0.0, (new Distance(0))->to('km')->humanize('mi'));
     }
 }
diff --git a/tests/SpeedTest.php b/tests/SpeedTest.php
@@ -7,18 +7,22 @@
 
 class SpeedTest extends TestCase
 {
+    /** @test */
+    public function it_can_display_formatted_speed()
+    {
+        $this->assertSame('111', (string) (new Speed(60))->to('kmh'));
+        $this->assertSame('126', (string) (new Speed(68.12))->to('kmh'));
+        $this->assertSame('2', (string) (new Speed(1.2))->to('kmh'));
+        $this->assertSame('0', (string) (new Speed(0))->to('kmh'));
+    }
+
     /** @test */
     public function it_can_convert_speed_from_knot_to_kmh()
     {
         $this->assertSame(111.12, (new Speed(60))->humanize());
         $this->assertSame(126.16, (new Speed(68.12))->humanize());
         $this->assertSame(2.22, (new Speed(1.2))->humanize());
         $this->assertSame(0.0, (new Speed(0))->humanize());
-
-        $this->assertSame(111.12, (new Speed('60'))->humanize());
-        $this->assertSame(126.16, (new Speed('68.12'))->humanize());
-        $this->assertSame(2.22, (new Speed('1.2'))->humanize());
-        $this->assertSame(0.0, (new Speed('0'))->humanize());
     }
 
     /** @test */
@@ -28,10 +32,14 @@ public function it_can_convert_speed_from_knot_to_mph()
         $this->assertSame(78.39, (new Speed(68.12))->humanize('mph'));
         $this->assertSame(1.38, (new Speed(1.2))->humanize('mph'));
         $this->assertSame(0.0, (new Speed(0))->humanize('mph'));
+    }
 
-        $this->assertSame(69.05, (new Speed('60'))->humanize('mph'));
-        $this->assertSame(78.39, (new Speed('68.12'))->humanize('mph'));
-        $this->assertSame(1.38, (new Speed('1.2'))->humanize('mph'));
-        $this->assertSame(0.0, (new Speed('0'))->humanize('mph'));
+    /** @test */
+    public function it_can_convert_speed_from_knot_to_mph_via_kmh()
+    {
+        $this->assertSame(69.05, (new Speed(60))->to('kmh')->humanize('mph'));
+        $this->assertSame(78.39, (new Speed(68.12))->to('kmh')->humanize('mph'));
+        $this->assertSame(1.38, (new Speed(1.2))->to('kmh')->humanize('mph'));
+        $this->assertSame(0.0, (new Speed(0))->to('kmh')->humanize('mph'));
     }
 }