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package graphql.schema;


import graphql.Internal;
import graphql.PublicApi;
import graphql.language.InputValueDefinition;
import graphql.util.TraversalControl;
import graphql.util.TraverserContext;

import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Consumer;

import static graphql.Assert.assertNotNull;
import static graphql.Assert.assertValidName;
import static graphql.util.FpKit.getByName;
import static graphql.util.FpKit.valuesToList;
import static java.util.Collections.emptyList;

/**
 * Input objects defined via {@link graphql.schema.GraphQLInputObjectType} contains these input fields.
 *
 * There are similar to {@link graphql.schema.GraphQLFieldDefinition} however they can ONLY be used on input objects, that
 * is to describe values that are fed into a graphql mutation.
 *
 * See http://graphql.org/learn/schema/#input-types for more details on the concept.
 */
@PublicApi
public class GraphQLInputObjectField implements GraphQLDirectiveContainer {

    private final String name;
    private final String description;
    private GraphQLInputType type;
    private final Object defaultValue;
    private final InputValueDefinition definition;
    private final List directives;

    @Internal
    public GraphQLInputObjectField(String name, GraphQLInputType type) {
        this(name, null, type, null, emptyList(), null);
    }

    @Internal
    public GraphQLInputObjectField(String name, String description, GraphQLInputType type, Object defaultValue) {
        this(name, description, type, defaultValue, emptyList(), null);
    }

    @Internal
    public GraphQLInputObjectField(String name, String description, GraphQLInputType type, Object defaultValue, List directives, InputValueDefinition definition) {
        assertValidName(name);
        assertNotNull(type, "type can't be null");
        assertNotNull(directives, "directives cannot be null");

        this.name = name;
        this.type = type;
        this.defaultValue = defaultValue;
        this.description = description;
        this.directives = directives;
        this.definition = definition;
    }

    void replaceType(GraphQLInputType type) {
        this.type = type;
    }

    @Override
    public String getName() {
        return name;
    }

    public GraphQLInputType getType() {
        return type;
    }

    public Object getDefaultValue() {
        return defaultValue;
    }

    public String getDescription() {
        return description;
    }

    public InputValueDefinition getDefinition() {
        return definition;
    }

    @Override
    public List getDirectives() {
        return new ArrayList<>(directives);
    }

    /**
     * This helps you transform the current GraphQLInputObjectField into another one by starting a builder with all
     * the current values and allows you to transform it how you want.
     *
     * @param builderConsumer the consumer code that will be given a builder to transform
     *
     * @return a new object based on calling build on that builder
     */
    public GraphQLInputObjectField transform(Consumer builderConsumer) {
        Builder builder = newInputObjectField(this);
        builderConsumer.accept(builder);
        return builder.build();
    }

    @Override
    public TraversalControl accept(TraverserContext context, GraphQLTypeVisitor visitor) {
        return visitor.visitGraphQLInputObjectField(this, context);
    }

    @Override
    public List getChildren() {
        List children = new ArrayList<>();
        children.add(type);
        children.addAll(directives);
        return children;
    }

    public static Builder newInputObjectField(GraphQLInputObjectField existing) {
        return new Builder(existing);
    }


    public static Builder newInputObjectField() {
        return new Builder();
    }

    @PublicApi
    public static class Builder {
        private String name;
        private String description;
        private Object defaultValue;
        private GraphQLInputType type;
        private InputValueDefinition definition;
        private final Map directives = new LinkedHashMap<>();

        public Builder() {
        }

        public Builder(GraphQLInputObjectField existing) {
            this.name = existing.getName();
            this.description = existing.getDescription();
            this.defaultValue = existing.getDefaultValue();
            this.type = existing.getType();
            this.definition = existing.getDefinition();
            this.directives.putAll(getByName(existing.getDirectives(), GraphQLDirective::getName));
        }

        public Builder name(String name) {
            this.name = name;
            return this;
        }

        public Builder description(String description) {
            this.description = description;
            return this;
        }

        public Builder definition(InputValueDefinition definition) {
            this.definition = definition;
            return this;
        }

        public Builder type(GraphQLInputObjectType.Builder type) {
            return type(type.build());
        }

        public Builder type(GraphQLInputType type) {
            this.type = type;
            return this;
        }

        public Builder defaultValue(Object defaultValue) {
            this.defaultValue = defaultValue;
            return this;
        }

        public Builder withDirectives(GraphQLDirective... directives) {
            assertNotNull(directives, "directives can't be null");
            for (GraphQLDirective directive : directives) {
                withDirective(directive);
            }
            return this;
        }

        public Builder withDirective(GraphQLDirective directive) {
            assertNotNull(directive, "directive can't be null");
            directives.put(directive.getName(), directive);
            return this;
        }

        public Builder withDirective(GraphQLDirective.Builder builder) {
            return withDirective(builder.build());
        }

        /**
         * This is used to clear all the directives in the builder so far.
         *
         * @return the builder
         */
        public Builder clearDirectives() {
            directives.clear();
            return this;
        }

        public GraphQLInputObjectField build() {
            return new GraphQLInputObjectField(name, description, type, defaultValue, valuesToList(directives), definition);
        }
    }
}