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/*
 * Copyright 2014-2022 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.grails.config;

import java.util.ArrayList;
import java.util.List;

import org.springframework.core.env.EnumerablePropertySource;
import org.springframework.core.env.PropertySource;
import org.springframework.core.env.PropertySources;

import grails.util.Environment;

/**
 * A PropertySource aware of the Grails environment and that resolves keys based on the environment from other property sources
 *
 * @author Graeme Rocher
 * @since 3.0
 */
public class EnvironmentAwarePropertySource extends EnumerablePropertySource {

    EnvironmentAwarePropertySource(PropertySources source) {
        super("grails.environment", source);
    }

    protected List propertyNames;

    @Override
    public String[] getPropertyNames() {
        initialize();
        return this.propertyNames.toArray(new String[0]);
    }

    @Override
    public Object getProperty(String name) {
        initialize();
        if (!this.propertyNames.contains(name)) {
            return null;
        }

        Environment env = Environment.getCurrent();
        String key = "environments." + env.getName() + '.' + name;
        for (PropertySource propertySource : this.source) {
            if (propertySource != this) {
                Object value = propertySource.getProperty(key);
                if (value != null) {
                    return value;
                }
            }
        }
        return null;
    }

    private void initialize() {
        if (this.propertyNames == null) {
            this.propertyNames = new ArrayList<>();
            Environment env = Environment.getCurrent();
            String key = "environments." + env.getName();
            for (PropertySource propertySource : this.source) {

                if ((propertySource != this) &&
                        !propertySource.getName().contains("plugin") &&
                        propertySource instanceof EnumerablePropertySource) {
                    EnumerablePropertySource enumerablePropertySource = (EnumerablePropertySource) propertySource;

                    for (String propertyName : enumerablePropertySource.getPropertyNames()) {
                        if (propertyName.startsWith(key) && propertyName.length() > key.length()) {
                            this.propertyNames.add(propertyName.substring(key.length() + 1));
                        }
                    }
                }
            }
        }
    }

}