import { GraphQLError } from '../../error'; /**
                                             * Copyright (c) 2015-present, Facebook, Inc.
                                             *
                                             * This source code is licensed under the MIT license found in the
                                             * LICENSE file in the root directory of this source tree.
                                             *
                                             *  strict
                                             */

import keyMap from '../../jsutils/keyMap';
import { isNonNullType } from '../../type/definition';


export function missingFieldArgMessage(fieldName, argName, type) {
  return 'Field "' + fieldName + '" argument "' + argName + '" of type ' + ('"' + String(type) + '" is required but not provided.');
}

export function missingDirectiveArgMessage(directiveName, argName, type) {
  return 'Directive "@' + directiveName + '" argument "' + argName + '" of type ' + ('"' + String(type) + '" is required but not provided.');
}

/**
 * Provided required arguments
 *
 * A field or directive is only valid if all required (non-null) field arguments
 * have been provided.
 */
export function ProvidedNonNullArguments(context) {
  return {
    Field: {
      // Validate on leave to allow for deeper errors to appear first.
      leave: function leave(node) {
        var fieldDef = context.getFieldDef();
        if (!fieldDef) {
          return false;
        }
        var argNodes = node.arguments || [];

        var argNodeMap = keyMap(argNodes, function (arg) {
          return arg.name.value;
        });
        fieldDef.args.forEach(function (argDef) {
          var argNode = argNodeMap[argDef.name];
          if (!argNode && isNonNullType(argDef.type)) {
            context.reportError(new GraphQLError(missingFieldArgMessage(node.name.value, argDef.name, argDef.type), [node]));
          }
        });
      }
    },

    Directive: {
      // Validate on leave to allow for deeper errors to appear first.
      leave: function leave(node) {
        var directiveDef = context.getDirective();
        if (!directiveDef) {
          return false;
        }
        var argNodes = node.arguments || [];

        var argNodeMap = keyMap(argNodes, function (arg) {
          return arg.name.value;
        });
        directiveDef.args.forEach(function (argDef) {
          var argNode = argNodeMap[argDef.name];
          if (!argNode && isNonNullType(argDef.type)) {
            context.reportError(new GraphQLError(missingDirectiveArgMessage(node.name.value, argDef.name, argDef.type), [node]));
          }
        });
      }
    }
  };
}