Add TaxManager

plugin/src/main/java/de/epiceric/shopchest/transaction/TaxManager.java

@@ -0,0 +1,97 @@
+package de.epiceric.shopchest.transaction;
+
+import de.epiceric.shopchest.debug.DebugLogger;
+import org.bukkit.Material;
+import org.bukkit.configuration.ConfigurationSection;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Locale;
+import java.util.Map;
+
+public class TaxManager {
+
+    private double defaultTax;
+    private Map<Material, Double> taxByMaterial;
+
+    public TaxManager() {
+        defaultTax = 0.0;
+        taxByMaterial = null;
+    }
+
+    /**
+     * Load the {@link TaxManager}
+     *
+     * @param debugLogger  The {@link DebugLogger} instance to log every step of the progress
+     * @param taxesSection The {@link ConfigurationSection} that is used to fill the {@link TaxManager}
+     */
+    public void load(DebugLogger debugLogger, ConfigurationSection taxesSection) {
+        debugLogger.debug("Initialize TaxManager");
+
+        if (taxByMaterial != null) {
+            throw new IllegalStateException("This TaxManager is already loaded");
+        }
+
+        if (taxesSection == null) {
+            taxByMaterial = Collections.emptyMap();
+            return;
+        }
+
+        final Map<Material, Double> loadingTaxMap = new HashMap<>();
+        for (Map.Entry<String, Object> entry : taxesSection.getValues(false).entrySet()) {
+            final String valueStr = String.valueOf(entry.getValue());
+            final double taxValue;
+            try {
+                taxValue = Double.parseDouble(valueStr);
+            } catch (NumberFormatException e) {
+                debugLogger.debug("Not a number at key '" + entry.getKey() + "' : " + valueStr);
+                continue;
+            }
+
+            final double taxFactor = taxValue / 100 + 1;
+
+            if (entry.getKey().equals("default")) {
+                defaultTax = taxFactor;
+                continue;
+            }
+            final Material material = Material.getMaterial(entry.getKey().toUpperCase(Locale.ENGLISH));
+            if (material == null) {
+                debugLogger.debug("Unknown material : " + entry.getKey());
+                continue;
+            }
+
+            loadingTaxMap.put(material, taxFactor);
+        }
+
+        if (loadingTaxMap.isEmpty()) {
+            taxByMaterial = Collections.emptyMap();
+            return;
+        }
+
+        taxByMaterial = loadingTaxMap;
+    }
+
+    /**
+     * Clear the {@link TaxManager}
+     */
+    public void clear() {
+        if (taxByMaterial == null) {
+            throw new IllegalStateException("This TaxManager is not loaded");
+        }
+
+        taxByMaterial.clear();
+        taxByMaterial = null;
+    }
+
+    /**
+     * Apply taxes
+     *
+     * @param material The taxed {@link Material}
+     * @param price    The price without taxes
+     * @return The price with taxes
+     */
+    public double applyTaxes(Material material, double price) {
+        return price * taxByMaterial.getOrDefault(material, defaultTax);
+    }
+
+}