/**
 * Copyright 2023 Fluence Labs Limited
 *
 * 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.
 */

import { generateSources, generateTypes } from "./generate/index.js";
import { CompilationResult, OutputType } from "./generate/interfaces.js";
import { getPackageJsonContent } from "./utils.js";

interface JsOutput {
  sources: string;
  types: string;
}

interface TsOutput {
  sources: string;
}

type LanguageOutput = {
  js: JsOutput;
  ts: TsOutput;
};

type NothingToGenerate = null;

export default async function aquaToJs<T extends OutputType>(
  res: CompilationResult,
  outputType: T,
): Promise<LanguageOutput[T] | NothingToGenerate> {
  if (
    Object.keys(res.services).length === 0 &&
    Object.keys(res.functions).length === 0
  ) {
    return null;
  }

  const packageJson = await getPackageJsonContent();

  return outputType === "js"
    ? {
        sources: generateSources(res, "js", packageJson),
        types: generateTypes(res, packageJson),
      }
    : // TODO: probably there is a way to remove this type assert
      // eslint-disable-next-line @typescript-eslint/consistent-type-assertions
      ({
        sources: generateSources(res, "ts", packageJson),
      } as LanguageOutput[T]);
}