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/*
 * Copyright (c) 2020 SAP SE or an SAP affiliate company. All rights reserved.
 */

package com.sap.cloud.sdk.cloudplatform.connectivity;

import java.util.HashMap;
import java.util.Map;

import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.sap.cloud.sdk.cloudplatform.connectivity.exception.DestinationAccessException;

import lombok.AccessLevel;
import lombok.Getter;

class EnvironmentVariableDestinationParser extends AbstractDestinationParser
{
    private static final String PROPERTIES = "properties";
    private static final String PROPERTY_KEY = "key";
    private static final String PROPERTY_VALUE = "value";

    @Getter( AccessLevel.PACKAGE )
    private final JsonObject destinationAsJson;

    EnvironmentVariableDestinationParser( final JsonObject destinationAsJson )
    {
        this.destinationAsJson = destinationAsJson;
    }

    private Map getStandardProperties()
    {
        final Map properties = new HashMap<>();

        for( final Map.Entry entry : destinationAsJson.entrySet() ) {
            final String key = entry.getKey();

            final JsonElement jsonElement = destinationAsJson.get(key);

            if( jsonElement == null || !jsonElement.isJsonPrimitive() ) {
                continue;
            }

            // for compatibility, add property keys with their standard casing

            if( PROPERTY_URI.equalsIgnoreCase(key) || "uri".equalsIgnoreCase(key) ) {
                properties.put(PROPERTY_URI, jsonElement.getAsString());
            } else if( PROPERTY_USERNAME.equalsIgnoreCase(key) || "username".equalsIgnoreCase(key) ) {
                properties.put(PROPERTY_USERNAME, jsonElement.getAsString());
            } else {
                for( final String propertyKey : standardPropertyKeys ) {
                    if( propertyKey.equalsIgnoreCase(key) ) {
                        properties.put(propertyKey, jsonElement.getAsString());
                    }
                }
            }
        }

        return properties;
    }

    @Override
    Map getProperties()
        throws DestinationAccessException
    {
        final Map properties = getStandardProperties();

        final JsonElement jsonElement = destinationAsJson.get(PROPERTIES);

        if( jsonElement != null ) {
            if( !jsonElement.isJsonArray() ) {
                throw new DestinationAccessException("No valid JSON array '" + PROPERTIES + "' defined.");
            }

            final JsonArray jsonArray = jsonElement.getAsJsonArray();

            for( final JsonElement nestedElement : jsonArray ) {
                if( nestedElement == null || !nestedElement.isJsonObject() ) {
                    throw new DestinationAccessException("Destination property is not a JSON object.");
                }

                final JsonObject jsonObject = nestedElement.getAsJsonObject();

                final JsonElement key = jsonObject.get(PROPERTY_KEY);
                final JsonElement value = jsonObject.get(PROPERTY_VALUE);

                if( key != null && key.isJsonPrimitive() && value != null && value.isJsonPrimitive() ) {
                    properties.put(key.getAsString(), value.getAsString());
                } else {
                    throw new DestinationAccessException(
                        "No valid JSON primitives '"
                            + PROPERTY_KEY
                            + "' and '"
                            + PROPERTY_VALUE
                            + "' defined for destination property.");
                }
            }
        }

        return properties;
    }
}