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/*******************************************************************************
 *   © 2019-2024 SAP SE or an SAP affiliate company. All rights reserved.
 ******************************************************************************/
package com.sap.cloud.mt.subscription;

import com.sap.cloud.mt.subscription.ServiceOperation.Status;
import com.sap.cloud.mt.subscription.ServiceOperation.Type;
import com.sap.cloud.mt.tools.api.Cloner;
import org.apache.commons.lang3.StringUtils;

import java.time.Instant;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.concurrent.atomic.AtomicReference;

/**
 * Service instance parameters
 */
public class ServiceInstance extends HashMap {
	public static final String ID = "id";
	public static final String NAME = "name";
	public static final String LABELS = "labels";
	public static final String TENANT_ID = "tenant_id";
	private List bindings = new ArrayList<>();
	private ServiceBinding newestBinding = null;
	private final ServiceOperation lastOperation;

	public ServiceInstance(Map m) {
		super(m);
		lastOperation = new ServiceOperation(m != null ? m : new HashMap());
	}

	public ServiceInstance createCopy() {
		var serviceInstanceCopy = new ServiceInstance(Cloner.clone(this, Map.class));
		serviceInstanceCopy.setBindings(bindings);
		return serviceInstanceCopy;
	}

	public String getId() {
		return containsKey(ID) ? (String) get(ID) : "";
	}

	public boolean isReady() {
		return containsKey("ready") && (boolean) get("ready");
	}

	public String getName() {
		return containsKey(NAME) ? (String) get(NAME) : "";
	}

	public String getServicePlanId() {
		return (String) get("service_plan_id");
	}

	public List getTenants() {
		var labels = (Map) get(LABELS);
		if (labels == null) {
			return new ArrayList<>();
		}
		var tenants = (List) labels.get(TENANT_ID);
		return tenants != null ? tenants.stream().filter(t -> !StringUtils.isBlank(t)).toList() : new ArrayList<>();
	}

	public void insertTenant(String tenantId) {
		var labels = (Map) get(LABELS);
		if (labels == null) {
			labels = new HashMap();
			put(LABELS, labels);
		}
		var tenants = (List) labels.get(TENANT_ID);
		if (tenants == null) {
			tenants = new ArrayList();
			labels.put(TENANT_ID, tenants);
		}
		tenants.add(tenantId);
	}

	public void clearTenants() {
		var labels = (Map) get(LABELS);
		if (labels == null) {
			return;
		}
		var tenants = (List) labels.get(TENANT_ID);
		if (tenants != null) {
			tenants.clear();
		}
	}

	public boolean hasTenant() {
		return !getTenants().isEmpty();
	}

	public Instant getCreatedAt() {
		return Instant.parse((String) get("created_at"));
	}

	public Instant getUpdatedAt() {
		return Instant.parse((String) get("updated_at"));
	}

	public String getUsable() {
		return (String) get("usable");
	}

	public ServiceOperation getLastOperation() {
		return lastOperation;
	}

	public List getBindings() {
		return bindings;
	}

	public void setBindings(List bindings) {
		this.bindings = bindings != null ? bindings : new ArrayList<>();
		final AtomicReference newestBindingRef = new AtomicReference<>(null);
		this.bindings.stream()
				.filter(b -> b.getServiceInstanceId().equals(getId()))
				.filter(ServiceBinding::isUsable).forEach(b -> {
					if (newestBindingRef.get() == null ||
							b.getCreatedAt().isAfter(newestBindingRef.get().getCreatedAt())) {
						newestBindingRef.set(b);
					}
				});
		if (newestBindingRef.get() == null) {
			this.newestBinding = null;
		} else {
			this.newestBinding = newestBindingRef.get();
		}
	}

	public Optional getBinding() {
		return newestBinding != null ? Optional.of(newestBinding) : Optional.empty();
	}

	public boolean isUsable() {
		var status = lastOperation.getStatus();
		return isReady() &&
				!(lastOperation.getType() == Type.CREATE && (status == Status.FAILED || status == Status.IN_PROGRESS));
	}

	@Override
	public boolean equals(Object o) {
		if (this == o) return true;
		if (o == null || getClass() != o.getClass()) return false;
		if (!super.equals(o)) return false;
		ServiceInstance that = (ServiceInstance) o;
		return Objects.equals(bindings, that.bindings) && Objects.equals(newestBinding, that.newestBinding) && Objects.equals(lastOperation, that.lastOperation);
	}

	@Override
	public int hashCode() {
		return Objects.hash(super.hashCode(), bindings, newestBinding, lastOperation);
	}
}