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This package contains Microsoft Azure Compute Management SDK. For documentation on how to use this package, please see https://aka.ms/azsdk/java/mgmt
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.
package com.azure.resourcemanager.compute.implementation;

import com.azure.core.http.rest.PagedFlux;
import com.azure.core.http.rest.PagedIterable;
import com.azure.core.management.exception.ManagementException;
import com.azure.core.util.Context;
import com.azure.resourcemanager.compute.models.VirtualMachineImage;
import com.azure.resourcemanager.compute.models.VirtualMachineImages;
import com.azure.resourcemanager.compute.models.VirtualMachinePublishers;
import com.azure.resourcemanager.compute.fluent.models.VirtualMachineImageInner;
import com.azure.resourcemanager.compute.fluent.models.VirtualMachineImageResourceInner;
import com.azure.resourcemanager.compute.fluent.VirtualMachineImagesClient;
import com.azure.core.management.Region;
import com.azure.resourcemanager.resources.fluentcore.utils.PagedConverter;
import reactor.core.publisher.Flux;

import java.util.List;

/** The implementation for {@link VirtualMachineImages}. */
public class VirtualMachineImagesImpl implements VirtualMachineImages {
    private final VirtualMachinePublishers publishers;
    private final VirtualMachineImagesClient client;

    public VirtualMachineImagesImpl(VirtualMachinePublishers publishers, VirtualMachineImagesClient client) {
        this.publishers = publishers;
        this.client = client;
    }

    @Override
    public VirtualMachineImage getImage(
        Region region, String publisherName, String offerName, String skuName, String version) {
        if ("latest".equalsIgnoreCase(version)) {
            List innerImages =
                this.client.listWithResponse(region.name(), publisherName, offerName, skuName,
                    null, 1, "name desc", Context.NONE).getValue();
            if (innerImages != null && !innerImages.isEmpty()) {
                VirtualMachineImageResourceInner innerImageResource = innerImages.get(0);
                version = innerImageResource.name();
            }
        }
        VirtualMachineImageInner innerImage =
            this.client.get(region.name(), publisherName, offerName, skuName, version);
        return (innerImage != null)
            ? new VirtualMachineImageImpl(region, publisherName, offerName, skuName, version, innerImage)
            : null;
    }

    @Override
    public VirtualMachineImage getImage(
        String region, String publisherName, String offerName, String skuName, String version) {
        if ("latest".equalsIgnoreCase(version)) {
            List innerImages =
                this.client.listWithResponse(region, publisherName, offerName, skuName,
                    null, 1, "name desc", Context.NONE).getValue();
            if (innerImages != null && !innerImages.isEmpty()) {
                VirtualMachineImageResourceInner innerImageResource = innerImages.get(0);
                version = innerImageResource.name();
            }
        }
        VirtualMachineImageInner innerImage = this.client.get(region, publisherName, offerName, skuName, version);
        return (innerImage != null)
            ? new VirtualMachineImageImpl(
                Region.fromName(region), publisherName, offerName, skuName, version, innerImage)
            : null;
    }

    @Override
    public PagedIterable listByRegion(Region location) {
        return listByRegion(location.toString());
    }

    @Override
    public PagedIterable listByRegion(String regionName) {
        return new PagedIterable<>(listByRegionAsync(regionName));
    }

    @Override
    public PagedFlux listByRegionAsync(Region region) {
        return listByRegionAsync(region.name());
    }

    @Override
    public PagedFlux listByRegionAsync(String regionName) {
        return PagedConverter
            .flatMapPage(
                publishers().listByRegionAsync(regionName),
                virtualMachinePublisher ->
                    virtualMachinePublisher
                        .offers()
                        .listAsync()
                        .onErrorResume(
                            ManagementException.class,
                            e -> e.getResponse().getStatusCode() == 404 ? Flux.empty() : Flux.error(e))
                        .flatMap(virtualMachineOffer -> virtualMachineOffer.skus().listAsync())
                        .flatMap(virtualMachineSku -> virtualMachineSku.images().listAsync()));
    }

    @Override
    public VirtualMachinePublishers publishers() {
        return this.publishers;
    }
}