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/*
 * Copyright © 2017-2023 Ocado (Ocava)
 *
 * 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
 *
 *     http://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 com.ocadotechnology.config;

import java.io.Serializable;
import java.util.Collection;
import java.util.Map.Entry;
import java.util.Objects;
import java.util.Set;
import java.util.stream.Collectors;

import javax.annotation.CheckForNull;

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;

class ConfigValue implements Serializable {

    static final String PREFIX_SEPARATOR = "@";

    final ImmutableMap, String> prefixedValues;
    @CheckForNull final String currentValue;

    ConfigValue(String currentValue, ImmutableMap, String> prefixedValues) {
        this.prefixedValues = prefixedValues;
        this.currentValue = currentValue;
    }

    ConfigValue getPrefix(String prefix) {
        ImmutableMap, String> filteredPrefixedValues = getFilteredPrefixedValues(prefix);
        String currentValue = getPrefixValue(filteredPrefixedValues);

        ImmutableMap.Builder, String> prefixedValues = ImmutableMap.builder();
        filteredPrefixedValues.forEach((prefixes, value) -> {
            ImmutableSet updatedPrefixes = removePrefix(prefix, prefixes);
            if (!updatedPrefixes.isEmpty()) {
                prefixedValues.put(updatedPrefixes, value);
            }
        });

        return new ConfigValue(currentValue, prefixedValues.build());
    }

    /**
     * If the prefix exists, it will use it as the current value while keeping all prefix values in place.
     * @param prefix The prefix to bias to.
     * @return A new ConfigValue with the currentValue set to the given prefix' value if it is present.
     */
    ConfigValue getWithPrefixBias(String prefix) {
        return new ConfigValue(getPrefixValue(getFilteredPrefixedValues(prefix)), prefixedValues);
    }

    private ImmutableMap, String> getFilteredPrefixedValues(String prefix) {
        return prefixedValues.entrySet()
                .stream()
                .filter(setStringEntry -> setStringEntry.getKey().contains(prefix))
                .collect(ImmutableMap.toImmutableMap(Entry::getKey, Entry::getValue));
    }

    private String getPrefixValue(ImmutableMap, String> filteredPrefixedValues) {
        return filteredPrefixedValues.entrySet()
                .stream()
                .filter(e -> hasSinglePrefix(e.getKey()))
                .findFirst()
                .map(Entry::getValue)
                .orElse(this.currentValue);
    }

    ImmutableMap getValuesByPrefixedKeys(String constant) {
        return prefixedValues.entrySet().stream()
                .collect(ImmutableMap.toImmutableMap(
                        e -> getPrefixedConfigString(e.getKey(), constant),
                        Entry::getValue));
    }

    String getPrefixedConfigString(ImmutableSet prefixes, String constant) {
        return prefixes.stream()
                .map(k -> k + PREFIX_SEPARATOR)
                .collect(Collectors.joining()) + constant;
    }

    ImmutableSet getPrefixes() {
        return prefixedValues.keySet().stream()
                .flatMap(Collection::stream)
                .collect(ImmutableSet.toImmutableSet());
    }

    private ImmutableSet removePrefix(String prefix, ImmutableSet prefixes) {
        return prefixes.stream()
                .filter(s -> !prefix.equals(s))
                .collect(ImmutableSet.toImmutableSet());
    }

    private boolean hasSinglePrefix(Set prefixes) {
        return prefixes.size() == 1;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        ConfigValue that = (ConfigValue) o;
        return Objects.equals(currentValue, that.currentValue) && Objects.equals(prefixedValues, that.prefixedValues);
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(currentValue);
    }
}