Implement buy command

Essentials/src/main/java/com/earth2me/essentials/commands/Commandbuy.java

@@ -0,0 +1,149 @@
+package com.earth2me.essentials.commands;
+
+import com.earth2me.essentials.Trade;
+import com.earth2me.essentials.User;
+import com.earth2me.essentials.craftbukkit.Inventories;
+import com.earth2me.essentials.adventure.AdventureUtil;
+import com.earth2me.essentials.utils.NumberUtil;
+import com.google.common.collect.Lists;
+import net.ess3.api.TranslatableException;
+import net.ess3.api.events.UserBalanceUpdateEvent;
+import org.bukkit.ChatColor;
+import org.bukkit.Server;
+import org.bukkit.inventory.ItemStack;
+
+import java.math.BigDecimal;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Locale;
+import java.util.logging.Level;
+
+import static com.earth2me.essentials.I18n.tlLiteral;
+
+// The file commandsell.java has been used as a "template"
+// Most of the code in this file is therefor a one-to-one copy from that file
+public class Commandbuy extends EssentialsCommand {
+    public Commandbuy() {
+        super("buy");
+    }
+
+    // Starting point for when the command is run
+    @Override
+    public void run(final Server server, final User user, final String commandLabel, final String[] args) throws Exception {
+        BigDecimal totalWorth = BigDecimal.ZERO;
+        // Throw an error if the user has not specified enough arguments.
+        if (args.length < 1) {
+            throw new NotEnoughArgumentsException();
+        }
+
+        // Let's check if the user is authorized to buy more of the stuff in hand
+        // Consider removing the first if.
+        if (args[0].equalsIgnoreCase("hand") && !user.isAuthorized("essentials.buy.hand")) {
+            throw new TranslatableException("buyHandPermission");
+        } else if ((args[0].equalsIgnoreCase("inventory") || args[0].equalsIgnoreCase("invent") || args[0].equalsIgnoreCase("all")) && !user.isAuthorized("essentials.buy.bulk")) {
+            throw new TranslatableException("buyBulkPermission");
+        }
+
+        final List<ItemStack> is = ess.getItemDb().getMatching(user, args);
+        int count = 0;
+
+        final boolean isBulk = is.size() > 1;
+
+        final List<ItemStack> notBought = new ArrayList<>();
+        for (ItemStack stack : is) {
+            if (!ess.getSettings().isAllowBuyNamedItems()) {
+                if (stack.getItemMeta() != null && stack.getItemMeta().hasDisplayName()) {
+                    if (isBulk) {
+                        notBought.add(stack);
+                        continue;
+                    }
+                    throw new TranslatableException("cannotBuyNamedItem");
+                }
+            }
+            try {
+                if (stack.getAmount() > 0) {
+                    totalWorth = totalWorth.add(buyItem(user, stack, args, isBulk));
+                    stack = stack.clone();
+                    count++;
+                    for (final ItemStack zeroStack : is) {
+                        if (zeroStack.isSimilar(stack)) {
+                            zeroStack.setAmount(0);
+                        }
+                    }
+                }
+            } catch (final Exception e) {
+                if (!isBulk) {
+                    throw e;
+                }
+            }
+        }
+        if (!notBought.isEmpty()) {
+            final List<String> names = new ArrayList<>();
+            for (final ItemStack stack : notBought {
+                if (stack.getItemMeta() != null) { //This was already validated but IDE still freaks out
+                    names.add(stack.getItemMeta().getDisplayName());
+                }
+            }
+            ess.showError(user.getSource(), new TranslatableException("cannotBuyTheseNamedItems", String.join(ChatColor.RESET + ", ", names)), commandLabel);
+        }
+        if (count != 1) {
+            final AdventureUtil.ParsedPlaceholder totalWorthStr = AdventureUtil.parsed(NumberUtil.displayCurrency(totalWorth, ess));
+            if (args[0].equalsIgnoreCase("blocks")) {
+                user.sendTl("totalWorthBlocks", totalWorthStr, totalWorthStr);
+            } else {
+                user.sendTl("totalWorthAll", totalWorthStr, totalWorthStr);
+            }
+        }
+    }
+
+    private BigDecimal buyItem(final User user, final ItemStack is, final String[] args, final boolean isBulkBuy) throws Exception {
+        final int amount = ess.getWorth().getAmount(ess, user, is, args, isBulkBuy);
+        final BigDecimal originalWorth = ess.getWorth().getPrice(ess, is);
+        final BigDecimal worth = originalWorth == null ? null : originalWorth.multiply(ess.getSettings().getMultiplier(user));
+
+        if (worth == null) {
+            throw new TranslatableException("itemCannotBeBought");
+        }
+
+        if (amount <= 0) {
+            if (!isBulkSell) {
+                user.sendTl("itemBought", AdventureUtil.parsed(NumberUtil.displayCurrency(BigDecimal.ZERO, ess)), BigDecimal.ZERO, is.getType().toString().toLowerCase(Locale.ENGLISH), NumberUtil.displayCurrency(worth, ess));
+            }
+            return BigDecimal.ZERO;
+        }
+
+        final BigDecimal result = worth.multiply(BigDecimal.valueOf(amount));
+
+        //TODO: Prices for Enchantments
+        final ItemStack ris = is.clone();
+        ris.setAmount(amount);
+        // This statement is for checking if more items that is in inventory is trying to be sold. Should never happen.
+        // Needs to be rewritten into a check about if more gold is consumed.
+        if (!Inventories.containsAtLeast(user.getBase(), ris, amount)) {
+            // This should never happen.
+            throw new IllegalStateException("Trying to remove more items than are available.");
+        }
+        Inventories.removeItemAmount(user.getBase(), ris, ris.getAmount());
+        user.getBase().updateInventory();
+        Trade.log("Command", "Buy", "Item", user.getName(), new Trade(ris, ess), user.getName(), new Trade(result, ess), user.getLocation(), user.getMoney(), ess);
+        // Needs to be changed to a method for taking money
+        user.takeMoney(result, null, UserBalanceUpdateEvent.Cause.COMMAND_BUY);
+        final String typeName = is.getType().toString().toLowerCase(Locale.ENGLISH);
+        final AdventureUtil.ParsedPlaceholder worthDisplay = AdventureUtil.parsed(NumberUtil.displayCurrency(worth, ess));
+        user.sendTl("itemBought", AdventureUtil.parsed(NumberUtil.displayCurrency(result, ess)), amount, typeName, worthDisplay);
+        ess.getLogger().log(Level.INFO, ess.getAdventureFacet().miniToLegacy(tlLiteral("itemBoughtConsole", user.getName(), typeName, ess.getAdventureFacet().miniToLegacy(NumberUtil.displayCurrency(result, ess)), amount, ess.getAdventureFacet().miniToLegacy(worthDisplay.toString()), user.getDisplayName())));
+        return result;
+    }
+
+    @Override
+    protected List<String> getTabCompleteOptions(final Server server, final User user, final String commandLabel, final String[] args) {
+        if (args.length == 1) {
+            return getMatchingItems(args[0]);
+        } else if (args.length == 2) {
+            return Lists.newArrayList("1", "64");
+        } else {
+            return Collections.emptyList();
+        }
+    }
+}