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/* Copyright 2023 predic8 GmbH, www.predic8.com

   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.predic8.membrane.core.graphql.model;

import com.predic8.membrane.core.graphql.ParsingException;
import com.predic8.membrane.core.graphql.Tokenizer;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

import static com.predic8.membrane.core.graphql.ParserUtil.*;
import static com.predic8.membrane.core.graphql.Tokenizer.Type.PUNCTUATOR;

public class OperationDefinition extends ExecutableDefinition {
    OperationType operationType;
    String name;
    List variableDefinitions;
    List directives;
    List selections;

    public OperationDefinition() {
    }

    public OperationDefinition(OperationType operationType, String name, List variableDefinitions, List directives, List selections) {
        this.operationType = operationType;
        this.name = name;
        this.variableDefinitions = variableDefinitions;
        this.directives = directives;
        this.selections = selections;
    }

    @Override
    public void parse(Tokenizer tokenizer) throws IOException, ParsingException {
        if (tokenizer.type() == Tokenizer.Type.NAME && OperationType.is(tokenizer.string())) {
            operationType = new OperationType();
            operationType.parse(tokenizer);

            tokenizer.mustAdvance();
            if (tokenizer.type() == Tokenizer.Type.NAME) {
                name = tokenizer.string();
                tokenizer.mustAdvance();
            }

            variableDefinitions = parseVariableDefinitionsOpt(tokenizer);
            if (variableDefinitions != null)
                tokenizer.mustAdvance();

            directives = parseDirectivesOpt(tokenizer);
            if (directives != null)
                tokenizer.mustAdvance();

            if (tokenizer.type() != Tokenizer.Type.PUNCTUATOR || tokenizer.punctuator() != '{')
                throw new ParsingException("Expected '{'.", tokenizer.position());
        } else {
            if (tokenizer.type() != Tokenizer.Type.PUNCTUATOR || tokenizer.punctuator() != '{')
                throw new ParsingException("Expected 'query', 'mutation', 'subscription' or '{'.", tokenizer.position());
        }

        selections = parseSelectionSetOpt(tokenizer); // this will always find a selection set, because we are at the '{'.
        // no need to revert, since selections cannot be null
    }

    public static List parseVariableDefinitionsOpt(Tokenizer t) throws IOException, ParsingException {
        if (t.type() != PUNCTUATOR || t.punctuator() != '(')
            return null;
        List res = new ArrayList<>();
        t.mustAdvance();
        do {
            VariableDefinition a = new VariableDefinition();
            a.parse(t);
            res.add(a);

            t.mustAdvance();
        } while (t.type() != PUNCTUATOR || t.punctuator() != ')');
        return res;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        OperationDefinition that = (OperationDefinition) o;
        return Objects.equals(operationType, that.operationType) && Objects.equals(name, that.name) && Objects.equals(variableDefinitions, that.variableDefinitions) && Objects.equals(directives, that.directives) && Objects.equals(selections, that.selections);
    }

    @Override
    public int hashCode() {
        return Objects.hash(operationType, name, variableDefinitions, directives, selections);
    }

    @Override
    public String toString() {
        return "OperationDefinition{" +
                "operationType=" + operationType +
                ", name='" + name + '\'' +
                ", variableDefinitions=" + variableDefinitions +
                ", directives=" + directives +
                ", selections=" + selections +
                '}';
    }

    public String getName() {
        return name;
    }

    public OperationType getOperationType() {
        return operationType;
    }

    public List getSelections() {
        return selections;
    }
}