/* Copyright (c) 2012 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.alorma.github.inapp;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Represents a block of information about in-app items.
 * An Inventory is returned by such methods as {@link IabHelper#queryInventory}.
 */
public class Inventory {
  Map<String, SkuDetails> mSkuMap = new HashMap<String, SkuDetails>();
  Map<String, Purchase> mPurchaseMap = new HashMap<String, Purchase>();

  Inventory() {
  }

  /**
   * Returns the listing details for an in-app product.
   */
  public SkuDetails getSkuDetails(String sku) {
    return mSkuMap.get(sku);
  }

  /**
   * Returns purchase information for a given product, or null if there is no purchase.
   */
  public Purchase getPurchase(String sku) {
    return mPurchaseMap.get(sku);
  }

  /**
   * Returns whether or not there exists a purchase of the given product.
   */
  public boolean hasPurchase(String sku) {
    return mPurchaseMap.containsKey(sku);
  }

  /**
   * Return whether or not details about the given product are available.
   */
  public boolean hasDetails(String sku) {
    return mSkuMap.containsKey(sku);
  }

  /**
   * Erase a purchase (locally) from the inventory, given its product ID. This just
   * modifies the Inventory object locally and has no effect on the server! This is
   * useful when you have an existing Inventory object which you know to be up to date,
   * and you have just consumed an item successfully, which means that erasing its
   * purchase data from the Inventory you already have is quicker than querying for
   * a new Inventory.
   */
  public void erasePurchase(String sku) {
    if (mPurchaseMap.containsKey(sku)) mPurchaseMap.remove(sku);
  }

  /**
   * Returns a list of all owned product IDs.
   */
  List<String> getAllOwnedSkus() {
    return new ArrayList<String>(mPurchaseMap.keySet());
  }

  /**
   * Returns a list of all owned product IDs of a given type
   */
  List<String> getAllOwnedSkus(String itemType) {
    List<String> result = new ArrayList<String>();
    for (Purchase p : mPurchaseMap.values()) {
      if (p.getItemType().equals(itemType)) result.add(p.getSku());
    }
    return result;
  }

  /**
   * Returns a list of all purchases.
   */
  List<Purchase> getAllPurchases() {
    return new ArrayList<Purchase>(mPurchaseMap.values());
  }

  void addSkuDetails(SkuDetails d) {
    mSkuMap.put(d.getSku(), d);
  }

  void addPurchase(Purchase p) {
    mPurchaseMap.put(p.getSku(), p);
  }
}