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import { gql } from "https://deno.land/x/oak_graphql@0.6.4/mod.ts";
import { print, visit } from "https://deno.land/x/graphql_deno@v15.0.0/mod.ts";
/** * The restructure function: * - it converts the query string into an AST with the visitor pattern design. * - it handles fragments. * - it handles * * @param  {any} value - Query string * @return {string} string */export function restructure(value: any) {  const variables = value.variables || {};  const operationName = value.operationName;
  let ast = gql(value.query);
  let fragments: { [key: string]: any } = {};  let containsFrags: boolean = false;  let existingFrags: { [key: string]: any } = {};  let existingVars: { [key: string]: any } = {};
  const buildFragsVisitor = {    FragmentDefinition: (node: any) => {      fragments[node.name.value] = node.selectionSet.selections;    },  };  const buildDefaultVarsVisitor = {    VariableDefinition: (node: any) => {      if (node.defaultValue) {        if (!variables[node.variable.name.value]) {          variables[node.variable.name.value] = node.defaultValue.value;        }      }    },  };
  const rewriteVarsVistor = {    VariableDefinition: (node: any) => {      return null;    },    Variable: (node: any) => {      if (variables.hasOwnProperty(node.name.value)) {        return { kind: 'EnumValue', value: variables[node.name.value] };      }    },  };
  const rewriteVisitor = {    FragmentSpread: (node: any) => {      if (fragments.hasOwnProperty(node.name.value)) {        return fragments[node.name.value];      }    },  };
  const clearFragVisitor = {    FragmentDefinition: (node: any) => {      if (fragments.hasOwnProperty(node.name.value)) {        return null;      }    },  };  const checkFragmentationVisitor = {    FragmentSpread: (node: any) => {      containsFrags = true;      existingFrags[node.name.value] = true;    },    Variable: (node: any) => {      containsFrags = true;      existingVars[node.name.value] = true;    },  };
  const firstBuildVisitor = {    ...buildFragsVisitor,    ...buildDefaultVarsVisitor,  };
  const firstRewriteVisitor = {    ...rewriteVisitor,    ...rewriteVarsVistor,    OperationDefinition: (node: any) => {      if (operationName && node.name.value != operationName) {        return null;      }    },    InlineFragment: (node: any) => {      return [        {          kind: 'Field',          alias: undefined,          name: { kind: 'Name', value: '__typename' },          arguments: [],          directives: [],          selectionSet: undefined,        },        node,      ];    },  };
  visit(ast, { leave: firstBuildVisitor });
  ast = gql(print(visit(ast, { leave: firstRewriteVisitor })));  visit(ast, { leave: checkFragmentationVisitor });  while (containsFrags) {    containsFrags = false;    fragments = {};    visit(ast, { enter: buildFragsVisitor });
    ast = gql(print(visit(ast, { leave: firstRewriteVisitor })));    visit(ast, { leave: checkFragmentationVisitor });
    //if existingFrags has a key that fragments does not    const exfragskeys = Object.keys(existingFrags);    const fragskeys = Object.keys(fragments);    const exvarsskeys = Object.keys(existingVars);    const varkeys = Object.keys(variables);    //exfragskeys.every(key=>fragskeys.includes(key))    if (!exfragskeys.every((key) => fragskeys.includes(key))) {      return console.log({ error: 'missing fragment definitions' });    }    if (!exvarsskeys.every((key) => varkeys.includes(key))) {      return console.log({ error: 'missing variable definitions' });    }  }
  ast = visit(ast, { leave: clearFragVisitor });
  return print(ast);}