import { GraphQLInterfaceType } from "graphql";
import { RenderContext } from "../common/RenderContext";
import { typeComment } from "../common/comment";
import { objectType } from "./objectType";

export function interfaceType(type: GraphQLInterfaceType, ctx: RenderContext) {
  if (!ctx.schema) {
    throw new Error("schema is required to render unionType");
  }
  const typeNames = ctx.schema.getPossibleTypes(type).map((t) => t.name);
  if (!typeNames.length) {
    objectType(type, ctx);
  } else {
    ctx.addCodeBlock(
      `${typeComment(type)}export type ${type.name} = (${typeNames.join(" | ")}) & { __isUnion?: true }`
    );
  }
}

// interface should produce an object like
// export type Nameable = {
// 	__interface:{
// 			name:string
// 	};
// 	__resolve:{
// 		['on_Card']: Card;
// 		['on_CardStack']: CardStack;
// 	}
// }

// export const interfaceType = (type: GraphQLInterfaceType, ctx: RenderContext) => {
//     if (!ctx.schema) {
//         throw new Error('schema is req  required to render unionType ')
//     }
//     const typeNames = ctx.schema.getPossibleTypes(type).map((t) => t.name)
//     let resolveContent = typeNames
//         .map((name) => `on_${name}?: ${name}`)
//         .join('\n    ')

//     ctx.addCodeBlock(
//         `${typeComment(type)}export type ${type.name}={
//   __interface:
//     ${typeNames.join('|')}
//   __resolve: {
//     ${resolveContent}
//   }
//   __typename?: string
// }`,
//     )
// }