Implementing Blitz mechanic (WIP) (#8835)

* added blitz mechanic (mostly copy/paste of dash)

* renamed class

* reworked alt cost abilities, greatly reduced redundant code

* updated text generation

* removed all skips

* added test for blitz

* changed blitz implementation

* [SNC] Implemented Tenacious Underdog

Mage/src/main/java/mage/abilities/costs/AlternativeCostImpl.java

@@ -0,0 +1,127 @@
+package mage.abilities.costs;
+
+import mage.abilities.costs.mana.ManaCost;
+import mage.game.Game;
+
+/**
+ * Alternative costs
+ *
+ * @param <T>
+ * @author LevelX2
+ */
+public class AlternativeCostImpl<T extends AlternativeCostImpl<T>> extends CostsImpl<Cost> implements AlternativeCost {
+
+    protected String name;
+    protected String reminderText;
+    protected boolean isMana;
+
+    protected boolean activated;
+
+    public AlternativeCostImpl(String name, String reminderText, Cost cost) {
+        this.activated = false;
+        this.name = name;
+        this.isMana = cost instanceof ManaCost;
+        if (reminderText != null) {
+            this.reminderText = "<i>(" + reminderText + ")</i>";
+        }
+        this.add(cost);
+    }
+
+    public AlternativeCostImpl(final AlternativeCostImpl<?> cost) {
+        super(cost);
+        this.name = cost.name;
+        this.reminderText = cost.reminderText;
+        this.activated = cost.activated;
+        this.isMana = cost.isMana;
+    }
+
+    @Override
+    public String getName() {
+        return this.name;
+    }
+
+    /**
+     * Returns the complete text for the addional cost or if onlyCost is true
+     * only the pure text for the included native cost
+     *
+     * @param onlyCost
+     * @return
+     */
+    @Override
+    public String getText(boolean onlyCost) {
+        if (onlyCost) {
+            return getText();
+        } else {
+            return (name != null ? name : "") + (isMana ? " " : "&mdash;") + getText() + (isMana ? "" : '.');
+        }
+    }
+
+    /**
+     * Returns a reminder text, if the cost has one
+     *
+     * @return
+     */
+    @Override
+    public String getReminderText() {
+        String replace = "";
+        if (reminderText != null && !reminderText.isEmpty()) {
+            replace = reminderText.replace("{cost}", this.getText(true));
+        }
+        return replace;
+    }
+
+    /**
+     * Returns a text suffix for the game log, that can be added to the cast
+     * message.
+     *
+     * @param position - if there are multiple costs, it's the postion the cost
+     *                 is set (starting with 0)
+     * @return
+     */
+    @Override
+    public String getCastSuffixMessage(int position) {
+        StringBuilder sb = new StringBuilder(position > 0 ? " and " : "").append(" with ");
+        sb.append(name);
+        return sb.toString();
+    }
+
+    /**
+     * If the player intends to pay the cost, the cost will be activated
+     */
+    @Override
+    public void activate() {
+        activated = true;
+    }
+
+    /**
+     * Reset the activate and count information
+     */
+    @Override
+    public void reset() {
+        activated = false;
+    }
+
+    /**
+     * Returns if the cost was activated
+     *
+     * @param game
+     * @return
+     */
+    @Override
+    public boolean isActivated(Game game) {
+        return activated;
+    }
+
+    @Override
+    public AlternativeCostImpl<?> copy() {
+        return new AlternativeCostImpl<>(this);
+    }
+
+    @Override
+    public Cost getCost() {
+        if (this.iterator().hasNext()) {
+            return this.iterator().next();
+        }
+        return null;
+    }
+}