import { BACKEND_DIR_NAME } from '@ones-open/cli-utils'
import commonjs from '@rollup/plugin-commonjs'
import json from '@rollup/plugin-json'
import resolve from '@rollup/plugin-node-resolve'
import { join } from 'path'
import type { OutputOptions } from 'rollup'
import { rollup } from 'rollup'
import typescript from 'rollup-plugin-typescript2'

import { cwd } from 'process'

function getDefaultRollupConfig(currentWorkingDirectory: string) {
  const BASE_PATH = join(currentWorkingDirectory, BACKEND_DIR_NAME)
  const extensions = ['.mjs', '.js', '.ts', '.json', '.node']

  const DEFAULT_INPUT_OPTIONS = {
    input: join(BASE_PATH, 'src', 'index.ts'),
    plugins: [
      resolve({ extensions }),
      commonjs(),
      json(),
      typescript({
        tsconfig: join(BASE_PATH, 'tsconfig.json'),
      }),
    ],
  }

  const DEFAULT_OUTPUT_OPTIONS = {
    file: join(BASE_PATH, 'dist', 'index.js'),
    format: 'cjs',
    sourcemap: false,
  } as OutputOptions

  const DEFAULT_ROLLUP_CONFIG = {
    ...DEFAULT_INPUT_OPTIONS,
    output: DEFAULT_OUTPUT_OPTIONS,
  }

  return {
    DEFAULT_ROLLUP_CONFIG,
    DEFAULT_INPUT_OPTIONS,
    DEFAULT_OUTPUT_OPTIONS,
  }
}

async function buildPluginProjectBackEnd(
  expandOutputOptions?: OutputOptions,
  currentWorkingDirectory = cwd(),
) {
  const { DEFAULT_INPUT_OPTIONS: inputOptions, DEFAULT_OUTPUT_OPTIONS: outputOptions } =
    getDefaultRollupConfig(currentWorkingDirectory)

  const bundle = await rollup(inputOptions)
  const finalOutputOptions = expandOutputOptions
    ? { ...outputOptions, ...expandOutputOptions }
    : outputOptions

  return bundle.write(finalOutputOptions)
}

export { getDefaultRollupConfig, buildPluginProjectBackEnd }