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package graphql.validation;


import graphql.language.Document;
import graphql.schema.GraphQLSchema;
import graphql.validation.rules.*;

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

public class Validator {

    public List validateDocument(GraphQLSchema schema, Document document) {
        ValidationContext validationContext = new ValidationContext(schema, document);


        ValidationErrorCollector validationErrorCollector = new ValidationErrorCollector();
        List rules = createRules(validationContext, validationErrorCollector);
        LanguageTraversal languageTraversal = new LanguageTraversal();
        languageTraversal.traverse(document, new RulesVisitor(validationContext, rules));

        return validationErrorCollector.getErrors();
    }

    private List createRules(ValidationContext validationContext, ValidationErrorCollector validationErrorCollector) {
        List rules = new ArrayList<>();
        
        ArgumentsOfCorrectType argumentsOfCorrectType = new ArgumentsOfCorrectType(validationContext, validationErrorCollector);
        rules.add(argumentsOfCorrectType);
        
        FieldsOnCorrectType fieldsOnCorrectType = new FieldsOnCorrectType(validationContext, validationErrorCollector);
        rules.add(fieldsOnCorrectType);
        FragmentsOnCompositeType fragmentsOnCompositeType = new FragmentsOnCompositeType(validationContext, validationErrorCollector);
        rules.add(fragmentsOnCompositeType);
        
        KnownArgumentNames knownArgumentNames = new KnownArgumentNames(validationContext, validationErrorCollector);
        rules.add(knownArgumentNames);
        KnownDirectives knownDirectives = new KnownDirectives(validationContext, validationErrorCollector);
        rules.add(knownDirectives);
        KnownFragmentNames knownFragmentNames = new KnownFragmentNames(validationContext, validationErrorCollector);
        rules.add(knownFragmentNames);
        KnownTypeNames knownTypeNames = new KnownTypeNames(validationContext, validationErrorCollector);
        rules.add(knownTypeNames);
        
        NoFragmentCycles noFragmentCycles = new NoFragmentCycles(validationContext, validationErrorCollector);
        rules.add(noFragmentCycles);
        NoUndefinedVariables noUndefinedVariables = new NoUndefinedVariables(validationContext, validationErrorCollector);
        rules.add(noUndefinedVariables);
        NoUnusedFragments noUnusedFragments = new NoUnusedFragments(validationContext, validationErrorCollector);
        rules.add(noUnusedFragments);
        NoUnusedVariables noUnusedVariables = new NoUnusedVariables(validationContext, validationErrorCollector);
        rules.add(noUnusedVariables);
        
        OverlappingFieldsCanBeMerged overlappingFieldsCanBeMerged = new OverlappingFieldsCanBeMerged(validationContext, validationErrorCollector);
        rules.add(overlappingFieldsCanBeMerged);
        
        PossibleFragmentSpreads possibleFragmentSpreads = new PossibleFragmentSpreads(validationContext, validationErrorCollector);
        rules.add(possibleFragmentSpreads);
        ProvidedNonNullArguments providedNonNullArguments = new ProvidedNonNullArguments(validationContext, validationErrorCollector);
        rules.add(providedNonNullArguments);
        
        ScalarLeafs scalarLeafs = new ScalarLeafs(validationContext, validationErrorCollector);
        rules.add(scalarLeafs);
        
        VariableDefaultValuesOfCorrectType variableDefaultValuesOfCorrectType = new VariableDefaultValuesOfCorrectType(validationContext, validationErrorCollector);
        rules.add(variableDefaultValuesOfCorrectType);
        VariablesAreInputTypes variablesAreInputTypes = new VariablesAreInputTypes(validationContext, validationErrorCollector);
        rules.add(variablesAreInputTypes);
        VariableTypesMatchRule variableTypesMatchRule = new VariableTypesMatchRule(validationContext, validationErrorCollector);
        rules.add(variableTypesMatchRule);

        LoneAnonymousOperation loneAnonymousOperation = new LoneAnonymousOperation(validationContext, validationErrorCollector);
        rules.add(loneAnonymousOperation);
        
        return rules;
    }
}