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// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.

package com.microsoft.azure.sdk.iot.service.digitaltwin.helpers;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.gson.JsonPrimitive;
import com.microsoft.azure.sdk.iot.service.digitaltwin.generated.models.DigitalTwinGetDigitalTwinHeaders;
import com.microsoft.azure.sdk.iot.service.digitaltwin.generated.models.DigitalTwinInvokeComponentCommandHeaders;
import com.microsoft.azure.sdk.iot.service.digitaltwin.generated.models.DigitalTwinInvokeRootLevelCommandHeaders;
import com.microsoft.azure.sdk.iot.service.digitaltwin.generated.models.DigitalTwinUpdateDigitalTwinHeaders;
import com.microsoft.azure.sdk.iot.service.digitaltwin.models.DigitalTwinCommandResponse;
import com.microsoft.azure.sdk.iot.service.digitaltwin.customized.DigitalTwinGetHeaders;
import com.microsoft.azure.sdk.iot.service.digitaltwin.models.DigitalTwinInvokeCommandHeaders;
import com.microsoft.azure.sdk.iot.service.digitaltwin.customized.DigitalTwinUpdateHeaders;
import com.microsoft.azure.sdk.iot.service.exceptions.IotHubException;
import com.microsoft.rest.ServiceResponseWithHeaders;
import rx.Observable;
import rx.functions.Func1;

public final class Tools {
    private static final ObjectMapper objectMapper = new ObjectMapper();

    public static final Func1, Observable>> FUNC_TO_DIGITAL_TWIN_GET_RESPONSE = object -> {
        DigitalTwinGetHeaders digitalTwinGetHeaders = new DigitalTwinGetHeaders();
        digitalTwinGetHeaders.withETag(object.headers().eTag());
        ServiceResponseWithHeaders result = new ServiceResponseWithHeaders<>(object.body(), digitalTwinGetHeaders, object.response());
        return Observable.just(result);
    };

    public static final Func1, Observable>> FUNC_TO_DIGITAL_TWIN_UPDATE_RESPONSE = object -> {
        DigitalTwinUpdateHeaders digitalTwinUpdateHeaders = new DigitalTwinUpdateHeaders();
        digitalTwinUpdateHeaders.withETag(object.headers().eTag());
        digitalTwinUpdateHeaders.withLocation(object.headers().location());
        ServiceResponseWithHeaders result = new ServiceResponseWithHeaders<>(object.body(), digitalTwinUpdateHeaders, object.response());
        return Observable.just(result);
    };

    public static final Func1, Observable>> FUNC_TO_DIGITAL_TWIN_COMMAND_RESPONSE = object -> {
        try {
            DigitalTwinCommandResponse digitalTwinCommandResponse = new DigitalTwinCommandResponse();
            digitalTwinCommandResponse.setPayload(new JsonPrimitive(objectMapper.writeValueAsString(object.body())));
            digitalTwinCommandResponse.setStatus(object.headers().xMsCommandStatuscode());
            DigitalTwinInvokeCommandHeaders digitalTwinInvokeCommandHeaders = new DigitalTwinInvokeCommandHeaders();
            digitalTwinInvokeCommandHeaders.setRequestId(object.headers().xMsRequestId());
            ServiceResponseWithHeaders result = new ServiceResponseWithHeaders<>(digitalTwinCommandResponse, digitalTwinInvokeCommandHeaders, object.response());
            return Observable.just(result);
        }
        catch (JsonProcessingException e) {
            return Observable.error(new IotHubException("Failed to parse the resonse"));
        }

    };

    public static final Func1, Observable>> FUNC_TO_DIGITAL_TWIN_COMPONENT_COMMAND_RESPONSE = object -> {
        try {
            DigitalTwinCommandResponse digitalTwinCommandResponse = new DigitalTwinCommandResponse();
            digitalTwinCommandResponse.setPayload(new JsonPrimitive(objectMapper.writeValueAsString(object.body())));
            digitalTwinCommandResponse.setStatus(object.headers().xMsCommandStatuscode());
            DigitalTwinInvokeCommandHeaders digitalTwinInvokeCommandHeaders = new DigitalTwinInvokeCommandHeaders();
            digitalTwinInvokeCommandHeaders.setRequestId(object.headers().xMsRequestId());
            ServiceResponseWithHeaders result = new ServiceResponseWithHeaders<>(digitalTwinCommandResponse, digitalTwinInvokeCommandHeaders, object.response());
            return Observable.just(result);
        }
        catch (JsonProcessingException e) {
            return Observable.error(new IotHubException("Failed to parse the resonse"));
        }

    };

    /**
     * Empty private constructor to prevent accidental creation of instances
     */
    private Tools() {

    }

    public static boolean isNullOrEmpty(String value) {
        return value == null || value.isEmpty();
    }
}