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A native Java library to talk to the Canvas REST API
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package edu.ksu.canvas.impl;


import com.google.gson.reflect.TypeToken;
import edu.ksu.canvas.interfaces.AccountReader;
import edu.ksu.canvas.interfaces.AccountWriter;
import edu.ksu.canvas.model.Account;
import edu.ksu.canvas.model.status.Delete;
import edu.ksu.canvas.net.Response;
import edu.ksu.canvas.net.RestClient;
import edu.ksu.canvas.oauth.OauthToken;
import edu.ksu.canvas.requestOptions.GetSubAccountsOptions;
import edu.ksu.canvas.requestOptions.ListAccountOptions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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

public class AccountImpl extends BaseImpl implements AccountReader, AccountWriter {
    private static final Logger LOG = LoggerFactory.getLogger(AccountImpl.class);

    public AccountImpl(String canvasBaseUrl, Integer apiVersion, OauthToken oauthToken, RestClient restClient,
                       int connectTimeout, int readTimeout, Integer paginationPageSize, Boolean serializeNulls) {
        super(canvasBaseUrl, apiVersion, oauthToken, restClient, connectTimeout, readTimeout,
                paginationPageSize, serializeNulls);
    }

    @Override
    public Optional getSingleAccount(String accountId) throws IOException {
        LOG.debug("getting account {}", accountId);
        String url = buildCanvasUrl("accounts/" + accountId, Collections.emptyMap());

        Response response = canvasMessenger.getSingleResponseFromCanvas(oauthToken, url);
        if (response.getErrorHappened() || response.getResponseCode() != 200) {
            return Optional.empty();
        }
        return responseParser.parseToObject(Account.class, response);
    }

    @Override
    public List listAccounts(ListAccountOptions options) throws IOException {
        LOG.debug("Listing accounts for current user ");
        String url = buildCanvasUrl("accounts", options.getOptionsMap());
        return getListFromCanvas(url);
    }

    @Override
    public List getSubAccounts(GetSubAccountsOptions options) throws IOException {
        LOG.debug("Getting list of sub-accounts for account {}", options.getAccountId());
        String url = buildCanvasUrl("accounts/" + options.getAccountId() + "/sub_accounts", options.getOptionsMap());
        return getListFromCanvas(url);
    }

    @Override
    public List listAccountsForCourseAdmins() throws IOException {
        LOG.debug("Getting list of accounts by admin course enrollments");
        String url = buildCanvasUrl("course_accounts", Collections.emptyMap());
        return getListFromCanvas(url);
    }

    @Override
    protected Type listType() {
        return new TypeToken>(){}.getType();
    }

    @Override
    protected Class objectType() {
        return Account.class;
    }

    @Override
    public Optional createAccount(String accountId, Account account) throws IOException {
        LOG.debug("creating account");
        String url = buildCanvasUrl("accounts/" + accountId + "/sub_accounts", Collections.emptyMap());
        Response response = canvasMessenger.sendJsonPostToCanvas(oauthToken, url, account.toJsonObject(serializeNulls));
        return responseParser.parseToObject(Account.class, response);
    }

    @Override
    public Optional updateAccount(Account account) throws IOException {
        LOG.debug("updating account");
        String url = buildCanvasUrl("accounts/" + account.getId(), Collections.emptyMap());
        Response response = canvasMessenger.sendJsonPutToCanvas(oauthToken, url, account.toJsonObject(serializeNulls));
        return responseParser.parseToObject(Account.class, response);
    }

    @Override
    public Boolean deleteAccount(String parentAccountId, String accountId) throws IOException {
        Map> postParams = new HashMap<>();
        String deleteUrl = buildCanvasUrl("accounts/" + parentAccountId+ "/sub_accounts/"+ accountId, Collections.emptyMap());
        Response response = canvasMessenger.deleteFromCanvas(oauthToken, deleteUrl, postParams);
        if (response.getErrorHappened() || response.getResponseCode() != 200) {
            LOG.debug("Failed to delete course, error message: {}", response.toString());
            return false;
        }
        Optional responseParsed = responseParser.parseToObject(Delete.class, response);
        return responseParsed.map(r -> r.getDelete()).orElse(false);
    }
}