todos from ipc19 - 1 missing

src/Bread.php

@@ -0,0 +1,10 @@
+<?php declare(strict_types=1);
+namespace ClansOfCaledonia;
+
+final class Bread extends Good
+{
+    public function isBread(): bool
+    {
+        return true;
+    }
+}

src/Cheese.php

@@ -0,0 +1,10 @@
+<?php declare(strict_types=1);
+namespace ClansOfCaledonia;
+
+final class Cheese extends Good
+{
+    public function isCheese(): bool
+    {
+        return true;
+    }
+}

src/Good.php

@@ -8,8 +8,53 @@ public static function milk(): self
         return new Milk;
     }
 
+    public static function bread(): self
+    {
+        return new Bread;
+    }
+
+    public static function whisky(): self
+    {
+        return new Whisky;
+    }
+
+    public static function cheese(): self
+    {
+        return new Cheese;
+    }
+
+    public static function wool(): self
+    {
+        return new Wool;
+    }
+
+    public static function grain(): self
+    {
+        return new Grain;
+    }
+
+    public function isWhisky(): bool
+    {
+        return false;
+    }
+
+    public function isBread(): bool
+    {
+        return false;
+    }
+
+    public function isWool(): bool
+    {
+        return false;
+    }
+
     public function isMilk(): bool
     {
         return false;
     }
+
+    public function isCheese(): bool
+    {
+        return false;
+    }
 }

src/Grain.php

@@ -0,0 +1,10 @@
+<?php declare(strict_types=1);
+namespace ClansOfCaledonia;
+
+final class Grain extends Good
+{
+    public function isGrain(): bool
+    {
+        return true;
+    }
+}

src/Market.php

@@ -3,15 +3,38 @@
 
 final class Market
 {
-    public function priceFor(Good $milk): Pound
+    /**
+     * @var PriceList
+     */
+    private $milkPrices;
+    /**
+     * @var PriceList
+     */
+    private $whiskyPrices;
+
+    public function __construct(PriceList $milkPrices, PriceList $whiskyPrices)
     {
-        return new Pound(5);
+        $this->milkPrices = $milkPrices;
+        $this->whiskyPrices = $whiskyPrices;
+    }
+
+    public function priceFor(Good $good): Pound
+    {
+        if($good->isMilk()){
+            return $this->milkPrices->current();
+        }
+
+        if($good->isWhisky()){
+            return $this->whiskyPrices->current();
+        }
     }
 
     public function sellTo(Offer $offer): Pound
     {
-        return new Pound(
-            $offer->amount()->amount() *
+        return (new Pound(
+            $offer->amount()->amount()
+        ))
+        ->multiply(
             $this->priceFor($offer->good())->amount()
         );
     }

src/Pound.php

@@ -17,4 +17,9 @@ public function amount(): int
     {
         return $this->amount;
     }
+
+    public function multiply(int $multiplier)
+    {
+        return new self($this->amount * $multiplier);
+    }
 }

src/PriceList.php

@@ -30,4 +30,16 @@ public function current(): Pound
     {
         return $this->prices[$this->position];
     }
+
+    public function decrement(int $steps = 1)
+    {
+        $this->position -= $steps;
+        return $this->position;
+    }
+
+    public function increment(int $steps = 1)
+    {
+        $this->position += $steps;
+        return $this->position;
+    }
 }

src/PriceListBuilder.php

@@ -3,6 +3,38 @@
 
 final class PriceListBuilder
 {
+    public function woolPrices(): PriceList
+    {
+        return PriceList::fromList(
+            new Pound(3),
+            new Pound(3),
+            new Pound(4),
+            new Pound(4),
+            new Pound(5),
+            new Pound(5),
+            new Pound(6),
+            new Pound(6),
+            new Pound(7),
+            new Pound(8)
+        );
+    }
+
+    public function grainPrices(): PriceList
+    {
+        return PriceList::fromList(
+            new Pound(3),
+            new Pound(3),
+            new Pound(4),
+            new Pound(5),
+            new Pound(6),
+            new Pound(6),
+            new Pound(7),
+            new Pound(7),
+            new Pound(8),
+            new Pound(8)
+        );
+    }
+
     public function milkPrices(): PriceList
     {
         return PriceList::fromList(
@@ -18,4 +50,53 @@ public function milkPrices(): PriceList
             new Pound(8)
         );
     }
+
+    public function breadPrices(): PriceList
+    {
+        return PriceList::fromList(
+            new Pound(7),
+            new Pound(8),
+            new Pound(9),
+            new Pound(10),
+            new Pound(11),
+            new Pound(11),
+            new Pound(12),
+            new Pound(13),
+            new Pound(14),
+            new Pound(15)
+        );
+    }
+
+    public function cheesePrices(): PriceList
+    {
+        return PriceList::fromList(
+            new Pound(7),
+            new Pound(8),
+            new Pound(9),
+            new Pound(10),
+            new Pound(11),
+            new Pound(12),
+            new Pound(13),
+            new Pound(14),
+            new Pound(14),
+            new Pound(15)
+        );
+    }
+
+    public function whiskyPrices(): PriceList
+    {
+        return PriceList::fromList(
+            new Pound(8),
+            new Pound(9),
+            new Pound(10),
+            new Pound(11),
+            new Pound(12),
+            new Pound(13),
+            new Pound(13),
+            new Pound(14),
+            new Pound(15),
+            new Pound(16)
+        );
+    }
+
 }

src/Whisky.php

@@ -0,0 +1,10 @@
+<?php declare(strict_types=1);
+namespace ClansOfCaledonia;
+
+final class Whisky extends Good
+{
+    public function isWhisky(): bool
+    {
+        return true;
+    }
+}