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/*
 * Copyright (C) 2011 Thomas Akehurst
 *
 * 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.github.tomakehurst.wiremock.matching;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.google.common.base.Optional;
import com.google.common.base.Predicate;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Iterables;
import com.google.common.collect.Iterators;

import java.io.IOException;
import java.lang.reflect.Constructor;
import java.util.Collections;
import java.util.Iterator;
import java.util.Map;

import static com.github.tomakehurst.wiremock.common.Exceptions.throwUnchecked;
import static com.google.common.collect.Iterables.tryFind;
import static com.google.common.collect.Iterators.find;
import static java.util.Arrays.asList;

public class StringValuePatternJsonDeserializer extends JsonDeserializer {

    private static final Map> PATTERNS =
        new ImmutableMap.Builder>()
            .put("equalTo", EqualToPattern.class)
            .put("equalToJson", EqualToJsonPattern.class)
            .put("matchesJsonPath", MatchesJsonPathPattern.class)
            .put("equalToXml", EqualToXmlPattern.class)
            .put("matchesXPath", MatchesXPathPattern.class)
            .put("contains", ContainsPattern.class)
            .put("matches", RegexPattern.class)
            .put("doesNotMatch", NegativeRegexPattern.class)
            .put("anything", AnythingPattern.class)
            .build();

    @Override
    public StringValuePattern deserialize(JsonParser parser, DeserializationContext context) throws IOException, JsonProcessingException {
        JsonNode rootNode = parser.readValueAsTree();

        if (isAbsent(rootNode)) {
            return StringValuePattern.ABSENT;
        }

        return buildStringValuePattern(rootNode);
    }

    public StringValuePattern buildStringValuePattern(JsonNode rootNode) throws JsonMappingException {
        Class patternClass = findPatternClass(rootNode);
        if (patternClass.equals(EqualToJsonPattern.class)) {
            return deserializeEqualToJson(rootNode);
        } else if (patternClass.equals(MatchesJsonPathPattern.class)) {
            return deserialiseMatchesJsonPathPattern(rootNode);
        } else if (patternClass.equals(MatchesXPathPattern.class)) {
            return deserialiseMatchesXPathPattern(rootNode);
        } else if (patternClass.equals(EqualToPattern.class)) {
            return deserializeEqualTo(rootNode);
        }

        Constructor constructor = findConstructor(patternClass);

        Map.Entry entry = find(rootNode.fields(), new Predicate>() {
            @Override
            public boolean apply(Map.Entry input) {
                return PATTERNS.keySet().contains(input.getKey());
            }
        });

        String operand = entry.getValue().textValue();
        try {
            return constructor.newInstance(operand);
        } catch (Exception e) {
            return throwUnchecked(e, StringValuePattern.class);
        }
    }

    private EqualToPattern deserializeEqualTo(JsonNode rootNode) throws JsonMappingException {
        if (!rootNode.has("equalTo")) {
            throw new JsonMappingException(rootNode.toString() + " is not a valid match operation");
        }

        String operand = rootNode.findValue("equalTo").textValue();
        Boolean ignoreCase = fromNullable(rootNode.findValue("caseInsensitive"));

        return new EqualToPattern(operand, ignoreCase);
    }

    private EqualToJsonPattern deserializeEqualToJson(JsonNode rootNode) throws JsonMappingException {
        if (!rootNode.has("equalToJson")) {
            throw new JsonMappingException(rootNode.toString() + " is not a valid match operation");
        }

        JsonNode operand = rootNode.findValue("equalToJson");

        Boolean ignoreArrayOrder = fromNullable(rootNode.findValue("ignoreArrayOrder"));
        Boolean ignoreExtraElements = fromNullable(rootNode.findValue("ignoreExtraElements"));

        // Allow either a JSON value or a string containing JSON
        if (operand.isTextual()) {
            return new EqualToJsonPattern(operand.textValue(), ignoreArrayOrder, ignoreExtraElements);
        } else {
            return new EqualToJsonPattern(operand, ignoreArrayOrder, ignoreExtraElements);
        }
    }

    private MatchesJsonPathPattern deserialiseMatchesJsonPathPattern(JsonNode rootNode) throws JsonMappingException {
        if (!rootNode.has("matchesJsonPath")) {
            throw new JsonMappingException(rootNode.toString() + " is not a valid match operation");
        }

        JsonNode outerPatternNode = rootNode.findValue("matchesJsonPath");
        if (outerPatternNode.isTextual()) {
            return new MatchesJsonPathPattern(outerPatternNode.textValue());
        }

        if (!outerPatternNode.has("expression")) {
            throw new JsonMappingException("expression is required in the advanced matchesJsonPath form");
        }

        String expression = outerPatternNode.findValue("expression").textValue();
        StringValuePattern valuePattern = buildStringValuePattern(outerPatternNode);

        return new MatchesJsonPathPattern(expression, valuePattern);
    }

    private MatchesXPathPattern deserialiseMatchesXPathPattern(JsonNode rootNode) throws JsonMappingException {
        if (!rootNode.has("matchesXPath")) {
            throw new JsonMappingException(rootNode.toString() + " is not a valid match operation");
        }

        JsonNode namespacesNode = rootNode.findValue("xPathNamespaces");

        Map namespaces = namespacesNode != null ?
            toNamespaceMap(namespacesNode) :
            Collections.emptyMap() ;

        JsonNode outerPatternNode = rootNode.findValue("matchesXPath");
        if (outerPatternNode.isTextual()) {
            return new MatchesXPathPattern(outerPatternNode.textValue(), namespaces);
        }

        if (!outerPatternNode.has("expression")) {
            throw new JsonMappingException("expression is required in the advanced matchesXPath form");
        }

        String expression = outerPatternNode.findValue("expression").textValue();
        StringValuePattern valuePattern = buildStringValuePattern(outerPatternNode);

        return new MatchesXPathPattern(expression, namespaces, valuePattern);
    }

    private static Map toNamespaceMap(JsonNode namespacesNode) {
        ImmutableMap.Builder builder = ImmutableMap.builder();
        for (Iterator> fields = namespacesNode.fields(); fields.hasNext(); ) {
            Map.Entry field = fields.next();
            builder.put(field.getKey(), field.getValue().textValue());
        }

        return builder.build();
    }

    private static Boolean fromNullable(JsonNode node) {
        return node == null ? null : node.asBoolean();
    }

    @SuppressWarnings("unchecked")
    private static Constructor findConstructor(Class clazz) {
        Optional> optionalConstructor =
            tryFind(asList(clazz.getDeclaredConstructors()), new Predicate>() {
                @Override
                public boolean apply(Constructor input) {
                    return input.getParameterTypes().length == 1 &&
                        input.getGenericParameterTypes()[0].equals(String.class);
                }
            });

        if (!optionalConstructor.isPresent()) {
            throw new IllegalStateException("Constructor for " + clazz.getSimpleName() + " must have a single string argument constructor");
        }

        return (Constructor) optionalConstructor.get();
    }

    private static boolean isAbsent(JsonNode rootNode) {
        for (Map.Entry node: ImmutableList.copyOf(rootNode.fields())) {
            if (node.getKey().equals("absent")) {
                return true;
            }
        }

        return false;
    }

    private static Class findPatternClass(JsonNode rootNode) throws JsonMappingException {
        for (Map.Entry node: ImmutableList.copyOf(rootNode.fields())) {
            Class patternClass = PATTERNS.get(node.getKey());
            if (patternClass != null) {
                return patternClass;
            }
        }

        throw new JsonMappingException(rootNode.toString() + " is not a valid match operation");
    }
}