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package com.chain.sequence.http;

import java.io.*;
import java.lang.IllegalStateException;
import java.lang.reflect.Type;
import java.util.*;

import com.chain.sequence.exception.*;

import com.google.gson.*;

import com.squareup.okhttp.Response;

/**
 * BatchResponse provides a convenient interface for handling the results of
 * batched API calls. The response contains one success or error per outgoing
 * request item in the batch. Errors are always of type APIExcpetion.
 */
public class BatchResponse {
  private Response response;
  private Map successesByIndex = new LinkedHashMap<>();
  private Map errorsByIndex = new LinkedHashMap<>();

  /**
   * This constructor is used when deserializing a response from an API call.
   */
  public BatchResponse(Response response, Gson serializer, Type tClass, Type eClass)
      throws ChainException, IOException {
    this.response = response;

    try {
      JsonArray root = new JsonParser().parse(response.body().charStream()).getAsJsonArray();
      for (int i = 0; i < root.size(); i++) {
        JsonElement elem = root.get(i);

        // Test for interleaved errors
        APIException err = serializer.fromJson(elem, eClass);
        if (err.code != null) {
          errorsByIndex.put(i, err);
          continue;
        }

        successesByIndex.put(i, (T) serializer.fromJson(elem, tClass));
      }
    } catch (IllegalStateException e) {
      throw new JSONException(
          "Unable to read body: " + e.getMessage(), response.headers().get("Chain-Request-ID"));
    }
  }

  /**
   * This constructor is used for synthetically generating a batch response
   * object from a map of successes and a map of errors. It ensures that
   * the successes and errors are stored in an order-preserving fashion.
   */
  public BatchResponse(Map successes, Map errors) {
    List successIndexes = new ArrayList<>();
    Iterator successIter = successes.keySet().iterator();
    while (successIter.hasNext()) successIndexes.add(successIter.next());
    Collections.sort(successIndexes);
    for (int i : successIndexes) successesByIndex.put(i, successes.get(i));

    List errorIndexes = new ArrayList<>();
    Iterator errorIter = errors.keySet().iterator();
    while (errorIter.hasNext()) errorIndexes.add(errorIter.next());
    Collections.sort(errorIndexes);
    for (int i : errorIndexes) errorsByIndex.put(i, errors.get(i));
  }

  /**
   * Returns the internal response object.
   */
  public Response response() {
    return response;
  }

  /**
   * Returns the total number of response objects. This should equal the number
   * of request objects in the batch.
   */
  public int size() {
    return successesByIndex.size() + errorsByIndex.size();
  }

  /**
   * Returns whether the request object at the given index produced a success.
   * @param index the index of the request object
   */
  public boolean isSuccess(int index) {
    return successesByIndex.containsKey(index);
  }

  /**
   * Returns whether the request object at the given index produced an error.
   * @param index the index of the request object
   */
  public boolean isError(int index) {
    return errorsByIndex.containsKey(index);
  }

  /**
   * Returns a items of successful response objects in the batch. The order of
   * the items corresponds to the order of the request objects that produced the
   * successes.
   */
  public List successes() {
    List res = new ArrayList<>();
    res.addAll(successesByIndex.values());
    return res;
  }

  /**
   * Returns a items of error objects in the batch. The order of the items
   * corresponds to the order of the request objects that produced the
   * errors.
   */
  public List errors() {
    List res = new ArrayList<>();
    res.addAll(errorsByIndex.values());
    return res;
  }

  /**
   * Returns a map of success responses, keyed by the index of the request
   * object that produced the success. The set of this map's keys is mutually
   * exclusive of the keys returned by errorsByIndex.
   */
  public Map successesByIndex() {
    return successesByIndex;
  }

  /**
   * Returns a map of error responses, keyed by the index of the request
   * object that produced the error. The set of this map's keys is mutually
   * exclusive of the keys returned by successByIndex.
   */
  public Map errorsByIndex() {
    return errorsByIndex;
  }
}